Oil Tempered Wire

Technical Product

Information

March 2011

This information is subject to change (design, dimensions, technical data, etc) without prior notice.

Spring wire for applications with high performance demands

Suzuki Garphyttan has produced wire since 1906. Since 1927 the main product is oiltempered valve spring wire for the automotive industry. During the years others specialty wires such as stainless round wire, flatrolled and shaped wire in carbon, low alloyed and stainless material, have been added to the product program. We have acquired extensive know-ledge and experience of steel grades, efficient manufacturing and quality control which is crucial to the properties of the finished product. Large resources are invested in research concerning improved properties of our products and improved manu-facturing processes, enabling Suzuki Garphyttan to be world leader in the manufacturing of spring wire.

Coiling properties Defect free surfaces, narrow dimensional and tensile strength tolerances are important in achieving the best properties for spring coiling. Each wire is continuously controlled during the entire manufacturing – from wire rod to the finished product – according to a specific control plan. Certified quality Suzuki Garphyttan has a Quality Management System certified according to the International Standard for Quality ISO TS 16949.

Our main wire rod suppliers also have Quality Management Systems certified by a third party according to ISO 9001 as a minimum and are also regularly audited by Suzuki Garphyttan. Technical support We are prepared to assist you in utilizing modern materials for maximum performance. For us it is obvious and necessary to be at the front, to serve our customers, discussing problems and areas for development in existing as well as new products. Environmental awareness Our goal is to manufacture high quality products without any negative effects on the environment. We are continuously improving our manufacturing processes to improve both internal and external environment. Before new investments are made, special consideration is given to environmental solutions.

We are certified according to ISO 14001. For more information regarding different elements in our products we recommend the database

IMDS ”International Material Data System” where each element is named with a separate CAS-No. See the following Internet address: www.mdsystem.com.

The main focus is spring wire for combustion engines (valve and transmission springs, piston rings, compression rings, fuel injection springs) and other automotive applications.

March 2011


Specialty steel spring wire for applications with high performance requirements

Oil tempered

spring wire

March 2011


High quality oil tempered wire

Stress distribution

in transversal section comparing round (picture

to the right) and egg shaped (picture to the left) wire respectively.

OTEVA® oil tempered valve spring wire For valve springs in combustion engines as well as for transmission and crankshaft damper springs subjected to extreme fatigue. OTEVA® grades cover different demands of high performance in tensile strength and fatigue life.

Our valve spring wire grades differ from each other in terms of chemical, mechanical and technical properties as well as required surface finish with regard to surface depth and decarburization levels.

Oil tempered wire is also manufactured with egg or elliptical cross sections. Profiled cross sections give the advantage of optimum distribution of stresses in a spring (see fig.).

KD oil tempered clutch and transmission spring wire For use in clutch springs of different types with various performance demands. KD is an oil tempered wire with good dynamical characteristics, excellent coiling characteristics and good relaxation properties.

STATO oil tempered spring wire An oil tempered wire grade used for springs subjected to static stress or moderate fatigue. STATO is available in different types of steel demanding ultimate tensile strength, and relaxation properties comparable to the OTEVA® grades. Good coiling characteristics make STATO an excellent alternative to cold drawn spring wire.

Chemical composition, approximate values in %

Our grades C Si Mn P max. S max. Cr V Ni

OTEVA® 90 SC 0.60 2.00 0.85 0.020 0,020 0.95 0.10 0.30

OTEVA® 75 SC 0.60 1.47 0.70 0.020 0.020 0.67 0.15 –

OTEVA® 70 SC 0.53 1.47 0.70 0.025 0.020 0.67 – –

70 KD 0.53 1.47 0.70 0.025 0.020 0.67 – –

STATO 70 0.53 1.47 0.70 0.025 0.025 0.67 – –

Nearest equivalent standards

Our grades EN 10270-2 SIS ASTM B.S. JIS

OTEVA® 90 SC – – – – –

OTEVA® 75 SC VDSiCrV – – – –

OTEVA® 70 SC VDSiCr 142090-05 A 877 2803 685A55HD JIS G 3561 SWOSC-V

70 KD TDSiCr 142090-05 A 401 2803 685A55ND –

STATO 70 FDSiCr 142090-05 A 401 2803 685A55HS JIS G 3568 SWOSC-B

March 2011


Eddy Current continuous surface testing

Suzuki Garphyttan uses the most advanced Eddy Current testing equipment available on the market. Experience from many years of surface testing in efficient continuous testing lines is a guarantee for high quality spring wire.

Eddy Current testing is carried out on material with high demands on surface quality. EC-testing is performed in Circograph and Defectomat equipment. The different levels of EC-testing are indicated in the steel grade designations in the table below.

Steel grade designations

OTEVA® 90 SC RD40 S



OTEVA® 70 SC S (*)

OTEVA® 70 SC (*) 70 KD R60

70 KD (*) STATO 70 (*)

SC = Super Clean

R = Circograph tested

RD = Circograph + Defectomat tested

40, 60 = Defect depth levels in µm

S = Shaved

Continuous testing of surface defects is performed as standard in sizes from 2.20 – 6.00 mm. Other sizes from 2.00 up to 6.20 mm can be agreed upon.

Grades indicated with (*) refer to material outside the size range 2.20 – 6.00 mm, or grades not requiring EC-testing.

March 2011


Delivery forms

Oil tempered spring wire Delivery forms

Spool/Coil diameter Coil/Spool weight Inner Outer Wire sizes diam. diam. mm Type Code min. mm max. mm abt. kg

0.50 – 1.00 Plastic spool S4610 314 460 40 0.50 – 2.10 Metal spool S6520 400 700 125/ 250

1.10 – 2.50 Coils/Carrier No 1 RU0004 450 700 250

0.80 – 2.50 Coils/Carrier No 2 RM0004 450 700 80/ 170 0.80 – 2.50 Coils/Wooden Box RM0021 450 700 80/ 170 RM0024 450 700 80/ 170 RM0025 450 700 80/ 170

2.00 – 3.00 Coils/Carrier No 3 RM0006 720 1200 225 RU0006 720 1200 450 RU0019 720 1200 450 RU0021* 720 1200 450

2.00 – 4.00 Coils/Wooden Box RM0021 720 1200 225 RM0022 720 1200 225 RM0023 720 1200 225

2.00 – 3.00 Coils/Carrier No 4 RU0011 1070 1500 900 RU0020 1070 1500 900 RU0022* 1070 1500 900

> 3.00 – 6.50 Coils/Carrier No 5 RU0012 1070 1500 1800 RU0014* 1070 1500 1800

> 6.50 – 14.00 Coils** 1350 1650 500

* RU0014, RU0021 and RU0022 has VCI plastic cover, oversea transport. ** Sizes > 6.50 – 14.00 mm in coils in unshaved condition subcontracted.

Packing The packings for the different delivery forms can be seen in the next page. Standard packing alternatives (others can be delivered on special request): Plastic and metal spool covered with paper - on EUR-pallet (S-codes) Coil covered with plastic hood - on carrier (RU-codes) Coil covered with VCI plastic hood - on carrier (RU-codes) oversea transport. Coils separately wrapped with paper - on carrier (RM-codes) Coils separately wrapped with paper - in wooden boxes (RM-codes) Wire sizes 6.50 – 10.00 mm is subcontracted and the sales is organized from our German office. Packaging materials used are only those which can be recycled, such as paper and polyethylene.

March 2011


Delivery forms

Oil tempered spring wire Carriers Surface: galvanized

Delivery Tara Max form Size, mm weight weight Type Code A B C D abt. kg abt. kg Carrier 1 RU0004 800 1200 1000 420 17 700 Carrier 2 RM0004 800 1200 1000 540 17 300

Carrier 3 RM0006 800 1200 900 720 18 1200 RU0006 800 1200 900 720 18 1200 RU0019 800 1200 900 720 18 1200 RU0021 800 1200 900 720 18 1200

Carrier 4 RM0011 1160 1530 960 1070 31 1200 RU0011 1160 1530 960 1070 31 1200 RU0020 1160 1530 960 1070 31 1200 RU0022 1160 1530 960 1070 31 1200

Carrier 5 RU0012 1160 1530 1200 1070 42 1800 RU0014 1160 1530 1200 1070 42 1800

Spools Colour: black/green

Delivery Tara Max. form Size, mm weight weight Type Code A B C D E abt. kg abt. kg

Plastic S4610 460 105 319 91 305 1.8 40

Metal S6520 695 314 400 270 33 26 275 EUR-pallet Spools

Delivery Tara Spool form Size, mm weight weight Weight Type Code Width Length Height abt. kg abt. kg abt. kg 1 SP6520 800 1200 150 26 275 750 2 SP4611 800 1200 340 34 40 500

3 SP4612 800 1200 540 42 40 750

4 SP4613 800 1200 740 50 40 1000

Packing of plastic and metal spools on EUR-pallet. Max. weight 1000 kg.

Wooden boxes Boxes for coils

Delivery Tara Coil form Outer size, mm weight weight Weight Type Code Width Length Height abt. kg abt. kg abt. kg Box 1 RM0021 1110 1150 1000 78 225/450 1000

Box 2 RM0022 1110 1150 620 57 225/450 500

Box 3 RM0023 1110 1150 430 48 225/450 250

Box 4 RM0024 800 850 940 52 80/170 500

Box 5 RM0025 800 850 580 36 80/170 250

Packing of wrapped coils with wire sizes > 2.50 mm is usually carried out in boxes No. 1 – 3. Coils with wire sizes < 2.50 mm in boxes No. 1, 4 – 5.

March 2011


OTEVA® 90 SC is a Super Clean (SC) steel.

OTEVA® 90 SC is especially intended for the manufacture of valve springs and other springs requiring extremely high fatigue properties and good relaxation properties at increased working temperatures.

OTEVA® 90 SC Oil tempered SiCrV+Ni-alloyed high tensile

valve spring wire for surface nitriding

Manufactured as standard in sizes from 2.00 mm to 6.00 mm Ø in shaved condition. Other wire sizes on request.

We also produce OTEVA® 90 SC in egg (ovate) or elliptical shape (corresponding to round cross section 2.50 mm to 6.00 mm).

Chemical composition

C Si Mn P max. S max. Cr V Ni % % % % % % % %

0.50 – 0.70 1.80 – 2.20 0.70 – 1.00 0.020 0.020 0.85 – 1.05 0.05 – 0.15 0.20 – 0.40

Physical properties Torsions4)

Size range1) Tolerance2) Tensile strength3) Reduct. of area l=300 mm, mm ± mm N/mm2 min. % min. revs.

2.00 – 2.50 0.020 2180 – 2280 45 5

>2.50 – 3.20 0.020 2130 – 2230 45 5

>3.20 – 4.00 0.025 2080 – 2180 45 4

>4.00 – 5.00 0.025 2030 – 2130 45 3

>5.00 – 5.60 0.030 1980 – 2080 40 3

>5.60 – 6.00 0.035 1980 – 2080 40 3

1) Other wire sizes on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire

axis. The rupture shall show no longitudinal cracks. Yield point The proof stress Rp0.2 is min. 0.8 x tensile strength of the wire. The proof stress will rise above 0.9 x tensile strength after stress relieving the springs. The tensile strength Rm within one coil does not vary more than 50 N/mm2.

E and G modulus Modulus of elasticity, E: About 206 kN/mm2 Modulus of shear, G: About 79.5 kN/mm2 Surface condition Non-destructive testing In the standard size range 2.20 - 6.00 mm the wire is tested continuously in Eddy Current equipment to a surface level of > 40 microns. Other wire sizes on request.

End sample test The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical inspection of the material structure.

Decarburization and surface defect depths Max. permissible depth of partial surface decarburization and surface defects, 0.5% x wire diameter. No complete decarburization allowed. Non-metallic inclusions The presence of non-metallic inclusions in the wire rod is inspected for every heat in accordance with the Suzuki Garphyttan method (or alternative max. T-method).

Our critera for releasing wire rod material for valve spring wire are the following; For wire rod samples: Inclusion size max. 15 µm in surface area.

Inclusion size, surface 5–10 > 10–15 >15 µm

Max. number of inclusions 50 7 0 As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm. * IVSWMA: International Valve Spring Wire Manufacturers Association

Heat treatment As soon as possible after coiling, the springs should be stress relieved. Depending on nitriding temperature used later in the valve spring manufacturing process, this temperature may be decreased.

Hot presetting After shot peening, the springs should be hot preset or stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress. Delivery forms See separate sheet.

March 2011


OTEVA® 90 SC

Oil tempered SiCrV+Ni-alloyed high tensile valve spring wire for surface nitriding

Soft shot peening Before the nitriding process a soft shot peening process shall be applied in order to remove the oxide layer on the spring wire surface.

Nitriding Springs of OTEVA® 90 SC should be nitrided to obtain optimum fatigue and relaxation properties. Our recommendation is gas nitriding.

Shot peening In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment.

For nitrided springs with an extremely hard surface zone, it is important to use a shot peening media with high hardness.

Shot peening of the inside of the spring coils is particularly critical.

Relaxation and fatigue properties In diagram 1 the fatigue properties of this grade are illustrated in a Goodman-diagram, based on a special test spring design.

Diagram 2 shows the relaxation properties (loss of load) of springs made from OTEVA® 90 SC wire subjected to static compression at different temperatures, nitrided/not nitrided.

For further technical support, please contact Suzuki Garphyttan.

Spring conditions for fatigue and relaxation tests (specially designed test spring) Diagrams 1 and 2: Wire diameter Ø 3,85 mm Spring index 6

Stress relieving

Temperature 450 ±5 °C (840 ±10 °F) min. 420 °C (790 ±10 °F) for nitriding

Time 30 minutes

Soft shot peened

Speed 20-30 m/s Time 5 min Shot size 0,8 mm

Nitriding Gas nitriding Temperature 450-470°C Time 5-20 hours Aim for surface hardness Min. 800 Hv Aim for core hardness Min. 560 Hv Compound (white) layer Max. 1 µm.

Shot peening (double shot peening for nitrided springs)

1st treatment Speed 56 m/sec. for 20 minutes, size of shots 0.6 mm

2nd treatment Speed 30 m/sec. for 10 minutes, size of shots 0.25 mm

Hardness of shot-peening grit (shot)

min. 800 Hv

Aim for Almen arc-height 0.55-0.60 mm

Hot presetting (theoretically set)

1500 N/mm2 (nitrided springs) 1300 N/mm2 (not nitrided springs)

Temperature 200°C (max. 250°C) Time 10 minutes

Diagram 1 - Fatigue properties as nitrided/not nitrided.

Nitrided Not nitireded

Diagram 2 - Relaxation properties, nitrided/not nitrided springs.

Final stress Tau (corr.) N/mm2

Initial stress Tau (corr.) N/mm2

Time of test: 24 h

Loss of load, %Initial stress Tau (corr.) N/mm2

Number of cycles: 25 x 106

March 2011


OTEVA® 75 SC is a Super Clean (SC) steel.

OTEVA® 75 SC is especially intended for the manufacture of valve springs and other springs requiring high fatigue properties and good relaxation properties at moderately increased working temperatures.

OTEVA® 75 SC Oil tempered SiCrV-alloyed

high tensile valve spring wire Manufactured as standard in sizes from 2.00 mm to 6.00 mm Ø in shaved condition.

We also produce OTEVA® 75 SC in egg (ovate) or elliptical shape (corresponding to round cross section 2.50 mm to 6.00 mm).


C Si Mn P max. S max. Cr V % % % % % % %

0.50 – 0.70 1.20 – 1.65 0.50 – 0.80 0.020 0.020 0.50 – 1.00 0.05 – 0.20

Physical properties Torsions4) Size range1) Tolerance2) Tensile strength3) Reduct. of area l=300 mm, mm ± mm N/mm2 min. % min. revs.

2.00 – 2.50 0.020 2110 – 2210 45 5

>2.50 – 3.20 0.020 2060 – 2160 45 5

>3.20 – 4.00 0.025 2010 – 2110 45 4

>4.00 – 5.00 0.025 1960 – 2060 45 3

>5.00 – 5.60 0.030 1910 – 2010 40 3

>5.60 – 6.00 0.035 1910 – 2010 40 3 1) Other wire sizes on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire

axis. The rupture shall show no longitudinal cracks.

Yield point The proof stress Rp0.2 is min. 0.9 x tensile strength of the wire. The tensile strength Rm within one coil does not vary more than 50 N/mm2.



Decarburization and surface defect depths Max. permissible depth of partial surface decarburization and surface defects, 0.5% x wire diameter. No complete decarburization allowed.

Non-metallic inclusions The presence of non-metallic inclusions in the wire rod is inspected for every heat in accordance with the Suzuki Garphyttan method (or alternative max. T-method).

Our criteria for releasing wire rod material for valve spring wire are the following; For wire rod samples: Inclusion size max. 15 µm in surface area.


Max. number of inclusions 50 7 0 As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm.

* IVSWMA: International Valve Spring Wire Manufacturers Association Delivery forms See separate sheet.

March 2011


OTEVA® 75 SC

Oil tempered SiCrV-alloyed high tensile valve spring wire

Heat treatment As soon as possible after coiling, the springs should be stress relieved.

Shot peening In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment. Shot peening of the inside of the spring coils is particularly critical.

Hot presetting After shot peening, the springs should be hot preset or stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.


Diagram 2 shows the relaxation properties (loss of load) of springs made from OTEVA® 75 SC wire subjected to static compression at different temperatures. For further technical support, please contact Suzuki Garphyttan.

Diagram 1 - Fatigue properties

Spring conditions for fatigue and relaxation tests (specially designed test spring) Diagram 1 and 2:

Wire diameter Ø 4.00 mm Spring index 6

Stress relieving

Temperature 420 ±5°C (790 ±10 °F) Time 30 minutes

Shot peening (double shot peening)



Hardness of Shot-peening grit (shot):

610-670 Hv

Aim for Almen arc-height Min 0.45 mm


1300 N/mm2


Diagram 2 - Relaxation properties

Final stress Tau (corr.) N/mm2 Initial stress Tau (corr.)

N/mm2 Time of test: 24 h



March 2011


OTEVA® 70 SC is a Super Clean (SC) steel. OTEVA® 70 SC is especially intended for the manufacture of valve springs and other springs requiring high fatigue properties and good relaxation properties at moderately increased working temperature.

OTEVA® 70 SC Oil tempered SiCr-alloyed

valve spring wire The wire is manufactured in sizes from 0.70 mm to 6.50 mm Ø in shaved or unshaved condition (6.50 – 14.00 mm in unshaved condition subcontracted). We are also producing OTEVA® 70 SC in egg (ovate) or elliptical shape (corresponding to round cross section 2.50 mm to 6.00 mm).


C Si Mn P max S max Cr % % % % % %

0.50 – 0.60 1.20 – 1.60 0.50 – 0.80 0.020 0.020 0.50 – 0.80 Physical properties

Torsions4) Size range1) Tolerance2) Tensile strength3) Reduct. of area l=300 mm, mm ± mm N/mm2 min. % min. revs.

0.70 – 0.80 0.010 2080 – 2210 – 6

>0.80 – 1.30 0.015 2080 – 2210 50 5

>1.30 – 1.40 0.015 2080 – 2210 50 5

>1.40 – 1.60 0.020 2080 – 2210 50 5

>1.60 – 2.00 0.020 2010 – 2160 50 5

>2.00 – 2.50 0.020 1960 – 2060 50 5

>2.50 – 3.00 0.020 1910 – 2010 50 4

>3.00 – 3.20 0.020 1910 – 2010 45 4

>3.20 – 3.50 0.025 1910 – 2010 45 4

>3.50 – 4.50 0.025 1860 – 1960 45 4

>4.50 – 5.00 0.025 1810 – 1910 45 3

>5.00 – 5.60 0.030 1810 – 1910 40 3

>5.60 – 6.50 0.035 1760 – 1860 40 3

1) Smaller wire sizes (from 0.50 mm) on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the

wire axis. The rupture shall show no longitudinal cracks. Yield point The proof stress Rp0.2 is min. 0.9 x tensile strength of the wire. The tensile strength Rm within one coil does not vary more than 50 N/Mm2.



Decarburization and surface defect depths Max. permissible depth of partial surface decarburization and surface defects, 1.0% x wire diameter. In shaved condition 0.5% x d. No complete decarburization allowed.

The presence of non-metallic inclusions in the wire rod is inspected for every heat in accordance with the Suzuki Garphyttan method (or alternative max. T-method).


Inclusion size, surface 5–10 >10–15 >15 µm

Max. number of incl. 50 7 0

As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm. * IVSWMA: International Valve Spring Wire Manufacturers Association

March 2011


OTEVA® 70 SC

Oil tempered SiCr-alloyed valve spring wire

Delivery forms See separate sheet.






Diagram 2 shows the relaxation properties (loss of load) of springs made from OTEVA® 70 SC wire subjected to static compression at different temperatures.




Wire diameter Ø 4,00 mm Spring index 6

Stress relieving


Shot peening Speed 48 m/sec. for 20 minutes, size of shots 0.8 mm


610-670 Hv

Aim for Almen arc-height Min. 0.40-0.45 mm


1200 N/mm2




Initial stress Tau (corr.)N/mm2

Time of test: 24 h

Loss of load, %



March 2011


OTEVA 76 SC is a Super Clean (SC) steel.

OTEVA 76 SC is especially intended for the manufacture of valve springs and other springs requiring high fatigue properties and good relaxation properties at moderately increased working temperatures.

OTEVA® 76 SC Oil tempered SiCrV-alloyed

high tensile valve spring wire Only manufactured in USA and China

Manufactured as standard in sizes from 2.00 mm to 6.00 mm Ø in shaved condition.

We also produce OTEVA 76 SC in egg (ovate) or elliptical shape (corresponding to round cross section 2.50 mm to 6.00 mm).


C Si Mn P max. S max. Cr V Ni % % % % % % % %

0.50 – 0.70 1.20 – 1.65 0.50 – 0.90 0.020 0.020 0.50 – 1.00 0.05 – 0.20 0.15 – 0.50


2.00 – 2.50 0.020 2110 – 2210 45 5

>2.50 – 3.20 0.020 2060 – 2160 45 5

>3.20 – 4.00 0.025 2010 – 2110 45 4

>4.00 – 5.00 0.025 1960 – 2060 45 3

>5.00 – 5.60 0.030 1910 – 2010 40 3

>5.60 – 6.00 0.035 1910 – 2010 40 3 1) Other wire sizes on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire






Non-metallic inclusions The presence of non-metallic inclusions in the wire rod is inspected for every heat in accordance with the Suzuki Garphyttan method (or alternative max. T-method).



Max. number of inclusions 50 7 0 As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm.

* IVSWMA: International Valve Spring Wire Manufacturers Association Delivery forms Please contact site: South Bend USA or Suzhou China

March 2011


OTEVA® 76 SC

Oil tempered SiCrV-alloyed high tensile valve spring wire





Diagram 2 shows the relaxation properties (loss of load) of springs made from OTEVA 76 SC wire subjected to static compression at different temperatures. For further technical support, please contact Suzuki Garphyttan.



Wire diameter Ø 4.00 mm Spring index 6

Stress relieving


Shot peening (double shot peening)




610-670 Hv

Aim for Almen arc-height Min 0.45 mm


1300 N/mm2



Final stress Tau (corr.) N/mm2 Initial stress Tau (corr.)

N/mm2 Time of test: 24 h



March 2011


SWOSC-V is a Super Clean (SC) steel. SWOSC-V is especially intended for the manufacture of valve springs and other springs requiring high fatigue properties and good relaxation properties at moderately increased working temperature.

SWOSC-V Oil tempered SiCr-alloyed

valve spring wire Only manufactured in China

The wire is manufactured in sizes from 2.00 mm to 6.50 mm Ø in shaved condition We are also producing SWOSC-V in egg (ovate) or elliptical shape (corresponding to round cross section 2.50 mm to 6.00 mm).



0.50 – 0.60 1.20 – 1.60 0.50 – 0.80 0.025 0.020 0.50 – 0.80 Physical properties

Torsions4) Size range1) Tolerance2) Tensile strength3) Reduct. of area l=300 mm, mm ± mm N/mm2 min. % min. revs.

1.80 – 2.00 0.020 2010 – 2160 50 5

>2.00 – 2.50 0.020 1960 – 2060 50 5

>2.50 – 3.00 0.020 1910 – 2010 50 4

>3.00 – 3.20 0.020 1910 – 2010 45 4

>3.20 – 3.50 0.025 1910 – 2010 45 4

>3.50 – 4.50 0.025 1860 – 1960 45 4

>4.50 – 5.00 0.025 1810 – 1910 45 3

>5.00 – 5.60 0.030 1810 – 1910 40 3

>5.60 – 6.50 0.035 1760 – 1860 40 3

1) Smaller wire sizes (from 0.50 mm) on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assesing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire


Yield point The proof stress Rp0.2 is min. 0.9 x tensile strength of the wire. The tensile strength Rm within one coil does not vary more than 50 N/Mm2.



Decarburization and surface defect depths Max. permissible depth of partial surface decarburization and surface defects, 1.0% x wire diameter. In shaved condition 0.5% x d. No complete decarburization allowed.

The presence of non-metallic inclusions in the wire rod is inspected for every heat in accordance with the Suzuki Garphyttan method (or alternative max. T-method).


Inclusion size, surface 5–10 >10–15 >15 µm

Max. number of incl. 50 7 0

As stated by IVSWMA*, it is likely to find occasional inclusions in valve spring quality steel of a size larger than 15µm. * IVSWMA: International Valve Spring Wire Manufacturers Association

March 2011


SWOSC-V

Oil tempered SiCr-alloyed valve spring wire

Delivery forms Please contact site: Suzhou China






Diagram 2 shows the relaxation properties (loss of load) of springs made from SWOSC-V wire subjected to static compression at different temperatures.




Wire diameter Ø 4,00 mm Spring index 6

Stress relieving


Shot peening Speed 48 m/sec. for 20 minutes, size of shots 0.8 mm


610-670 Hv

Aim for Almen arc-height Min. 0.40-0.45 mm


1200 N/mm2




Initial stress Tau (corr.)N/mm2

Time of test: 24 h

Loss of load, %



March 2011


70 KD is especially intended for the manufacture of clutch and transmission springs and similar moderately high fatigue stressed springs. The material has good relaxation properties.

The wire is manufactured in sizes from 0.70 to 6.50 mm Ø.

70 KD Oil tempered SiCr-alloyed

clutch and transmission spring wire Chemical composition


0.50 – 0.60 1.20 – 1.60 0.50 – 0.80 0.025 0.020 0.50 – 0.80


0.70 – 0.80 0.010 2080 – 2210 – 6

>0.80 – 1.30 0.015 2080 – 2210 50 5

>1.30 – 1.40 0.015 2080 – 2210 50 5

>1.40 – 1.60 0.020 2080 – 2210 50 5

>1.60 – 2.00 0.020 2010 – 2160 50 5

>2.00 – 2.50 0.020 1960 – 2060 50 5

>2.50 – 3.00 0.020 1910 – 2010 50 4

>3.00 – 3.20 0.020 1910 – 2010 45 4

>3.20 – 3.50 0.025 1910 – 2010 45 4

>3.50 – 4.50 0.025 1860 – 1960 45 4

>4.50 – 5.00 0.025 1810 – 1910 45 3

>5.00 – 5.60 0.030 1810 – 1910 40 3

>5.60 – 6.50 0.035 1760 – 1860 40 3

1) Smaller wire sizes (from 0.50 mm) on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. 4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the

wire axis. The rupture shall show no longitudinal cracks.


E and G modulus Modulus of elasticity, E: About 206 kN/mm2 Modulus of shear, G: About 79.5 kN/mm2

Surface condition Non-destructive testing In the standard size range 2.20 - 6.00 mm the wire is tested continuously in Eddy Current equipment to a surface level of > 60 microns. Other wire sizes on request.



Non-metallic inclusions Max. level 2 according to DIN 50602-M. Corresponding standard: ASTM E-45-A.



Hot presetting After shot peening, the springs should be hot preset or stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress. Delivery forms See separate sheet.

March 2011


STATO 70 is especially intended for the manufacture of springs exposed to static or moderately high fatigue stresses. The material has good relaxation properties.

The wire is manufactured in sizes from 0.70 mm to 6.50 mm Ø.

STATO 70 Oil tempered SiCr-alloyed

spring wire Chemical composition


0.50 – 0.60 1.20 – 1.60 0.50 – 0.80 0.025 0.025 0.50 – 0.80

Physical properties Size range1) Tolerance2) Tensile strength3) Reduct of area mm ± mm N/mm2 min. %

0.70 – 0.80 0.010 2100 – 2250 –

>0.80 – 1.00 0.015 2100 – 2250 50

>1.00 – 1.40 0.020 2100 – 2250 50

>1.40 – 1.60 0.020 2060 – 2210 50

>1.60 – 2.00 0.025 2010 – 2160 50

>2.00 – 2.50 0.025 1970 – 2120 50

>2.50 – 2.70 0.025 1910 – 2060 50

>2.70 – 3.00 0.030 1910 – 2060 50

>3.00 – 3.50 0.030 1910 – 2060 45

>3.50 – 4.00 0.030 1870 – 2020 45

>4.00 – 4.50 0.035 1870 – 2020 45

>4.50 – 5.00 0.035 1830 – 1980 45

>5.00 – 5.60 0.035 1830 – 1980 40

>5.60 – 6.50 0.040 1780 – 1930 40

1) Smaller wire sizes (from 0.50 mm) on request. 2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range. 3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265.


E and G modulus Modulus of elasticity, E: About 206 kN/mm2

Modulus of shear, G: About 79.5 kN/mm2. Surface condition



Non-metallic inclusions Max. level 2 according to DIN 50602-M. Corresponding standard: ASTM E-45-A. Heat treatment As soon as possible after coiling, the springs should be stress relieved. Shot peening In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment. Shot peening of the inside of the spring coils is particularly critical.


Delivery forms See separate sheet.

March 2011


Addresses Production Sites

Sweden Suzuki Garphyttan AB Bruksvägen 3 SE-719 80 Garphyttan Sweden Tel +46 (0)19 295 100 Fax +46 (0)19 295 101 e-mail [email protected] www.suzuki-garphyttan.com

USA Suzuki Garphyttan Corp. 4404 Nimtz Parkway South Bend, IN 46628 USA Tel +1 574 232 8800 Fax +1 574 232 2565 e-mail [email protected]

China Suzuki Garphyttan (Suzhou) Co. Ltd. Building B, No 6 Longpu Road SIP, Suzhou 215126 P.R. China Tel +86 512 8885 5360 Fax +86 512 8885 5366 e-mail [email protected]

Sales Offices

China Suzuki Garphyttan (Suzhou) Co. Ltd. Building B, No 6 Longpu Road SIP, Suzhou 215126 P.R. China Tel +86 512 8885 5360 Fax +86 512 8885 5366 e-mail [email protected]

Germany Suzuki Garphyttan GmbH Postfach 102541 DE-40016 Düsseldorf Germany Tel +49 (0)211/92304-0 Fax +49 (0)211/92304-40 e-mail [email protected] www.suzuki-garphyttan.de

Sweden Suzuki Garphyttan AB Bruksvägen 3 SE-719 80 Garphyttan Sweden Tel +46 (0)19 295 100 Fax +46 (0)19 295 101 e-mail [email protected] www.suzuki-garphyttan.com

France Tel +33 1 39 60 74 63 e-mail [email protected] USA Suzuki Garphyttan Corp. 4404 Nimtz Parkway South Bend, IN 46628 USA Tel +1 574 232 8800 Fax +1 574 232 2565 e-mail [email protected]

Sales Representatives/Distributors/Re-sellers

Albania, Austria, Bosnia-Herzegovina, Bulgaria, Croatia, Czech Republic, Hungary, Macedonia, Romania, Serbia-Montenegro, Slovakia and Slovenia AWS STAHLHANDEL GESELLSCHAFT MBH Feldgasse 2 AT-3422 Hadersfeld Austria Tel +43 2242 5330 Fax+43 2242 5333-30 e-mail [email protected] www.aws.co.at

Belgium, Luxembourg and Netherlands

JOOP H BECKER HANDELSONDERNEMING Schaaksport 142 NL-9728 PG Groningen Netherlands Tel +31 651 345 233 Fax+31 505 278 515 e-mail [email protected]

Brazil UBRASTEEL TRADING LTDA Rua Vieira de Morais, 420 - conj 92 - Campo Belo BR - CEP 04617-000 - Sao Paulo - SP Brazil Tel +55 11 5536 9540 Fax +55 11 5093 1131 e-mail [email protected], [email protected], [email protected]

Great Britain STRIDE SUPPLIES LTD Monkspath Business Park Highland Road GB-B90 4NZ Solihull, West Midlands England Tel +44 121 733 3010 Fax +44 121 733 3360 e-mail [email protected]

Korea JOIL STEEL Co 8F, Koami New B/D 13-6, Yoido-Dong Youngdeungpo-Ku Seoul Korea Tel +82-2-761-2028 Fax +82-2-761-2029 e-mail [email protected]

Spain BÖHLER UDDEHOLM IBERICA S A C/ Guifré 686-692 ES-08918 Badalona (Barcelona) Spain Tel +34 93 460 99 07 Fax +34 93 460 99 10 e-mail [email protected]

Oil Tempered Wire

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