THAI TECH STEEL (2013) CO.,LTD. THAI TECH STEEL (2003) CO ...ttsrolls2013.com/PDF/application...

THAI TECH STEEL (2013) CO.,LTD.THAI TECH STEEL (2003) CO.,LTD.

PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNN

CCCAAASSSTTT SSSTTTEEEEEELLL RRROOOLLLLLLDescription Description

Roll materials of this group are high carbon alloy steels with carbon content ranging from 0.4 to 1.4 % by weight. The major alloying element is chromium with small amount of molybdenum to improve hardenability. Hardness of high carbon alloy rolls is in the range HSC 30 to 42 depending on carbon content.

Microstructure of cast steels with carbon less than 0.8% consists of proeutectoid ferrite and fine pearlite. The fraction of pearlite increases with increasing carbon content of the steels and provide the necessary hardness for wear resistance. At carbon content exceeding this proeutectoid cementite (primary carbide) appears in the microstructure with full pearlitic matrix. Some of the primary carbide dissolves into matrix and re-precipitate as small, uniformly dispearsed carbide particles (free carbide) in the matrix as a result of heat treatment.

Due to the relatively low carbon content, small amount of carbide dispearsed in the tough pearlitic matrix provide the necessary toughness required in heavily stressed operations such as slabbing, blooming, and heavy section rolling. Limited carbon content also enables rolls to be welded under certain controlled conditions. With higher carbon content, the rolls are also capable to be used in medium section rolling and roughing in which superior wear resistance is demanded.

Application Application

Product Type of Mill PositionPlate 2 High Roughing

Sheet 2 and 3 High Roughing

Wide strip 2 and 3 High Roughing

Beam blanks 2 High Roughing

Billets 2 and 3 High Roughing

Heavy section and rail 2 and 3 High Roughing

Medium section 2 and 3 High RoughingSuper tough requirements.

Microstructure × 100Microstructure × 100

Pearlite matrix with small primary and secondary carbide.

Hardness Distribution CurveHardness Distribution CurveTCP (30-42 HSC.)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.

Mechanical Properties Mechanical Properties

HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )

MODULUS OF ELASTICITY

( kg/mm2)

BARREL 32 ~ 42 65 ~ 95 1.0 ~ 7.0 21 ~ 30 0.4 ~ 3.5 21000

JOURNAL 30 ~ 40 55 ~ 85 0.5 ~ 7.0 18 ~ 28 0.4 ~ 3.0 21000

Typical Analysis Typical AnalysisTTS

Symbol Cast Hardness C Si Mn P S Ni Cr Mo

TCPL S 30 ~ 38 0.4 ~ 0.6 0.3 ~ 0.7 0.6 ~ 1.0 0.03 MAX 0.03 MAX 1.00 MAX 0.8 ~ 1.2 0.5 MAX

TCP-1 S 32 ~ 38 0.6 ~ 0.8 0.3 ~ 0.7 0.6 ~ 1.0 0.03 MAX 0.03 MAX - 0.8 ~ 1.2 0.5 MAX

TCP-2 S 35 ~ 40 0.8 ~ 1.0 0.3 ~ 0.7 0.6 ~ 1.0 0.03 MAX 0.03 MAX - 0.8 ~ 1.2 0.5 MAX

TCP-3 S 37 ~ 42 1.0 ~ 1.2 0.3 ~ 0.7 0.6 ~ 1.0 0.03 MAX 0.03 MAX - 0.8 ~ 1.2 0.5 MAX

TCP-4 S 37 ~ 42 1.2 ~ 1.4 0.3 ~ 0.7 0.6 ~ 1.0 0.03 MAX 0.03 MAX - 0.8 ~ 1.2 0.5 MAX

UNCONTROLLED COPY



SSSTTTEEEEEELLL BBBAAASSSEEE RRROOOLLLLLL

Description DescriptionOriginally developed for roughing and intermediate

rolling, adamite rolls are steel-base rolls having properties between those of cast iron rolls and high carbon cast steel rolls.

Carbon contents of Adamite ranges from 1.4 to 2.4 wt.% with nickel, chromium and molybdenum as alloying elements. With higher content of carbon compound to cast steels, the hardness of Adamite can be controlled between HSC 40 and 58 by adjusting chemical composition and heat treatment processes.

Unique characteristics of Adamite are relatively high hardness while maintaining the levels of strength and toughness for operation requiring both wear resistance and mechanical strength. Microstructure of Adamite consists of hard primary carbide and free(secondary) carbide dispersed in the matrix of fine pearlite.

Adamite rolls are suitable for roughing and intermediate rolling of sections, wire rods and bars. They are can used in finishing stand for section rolling.


Product Type of Mill Position Plate 2 High Roughing

Sheet 2 and 3 High -

Wide strip 2 and 3 High Roughing and Intermediate

Beam blanks 2 High Roughing and Intermediate

Billets 2 and 3 High Intermediate and Finishing Heavy section and rail 2 and 3 High Roughing and Intermediate

Medium section 2 and 3 High Roughing and Intermediate

Bar and wire rod 2 and 3 High Roughing

Toughness and wear-resisting requirements.


Pearlite matrix with small primary and secondary carbide.

Hardness Distribution CurveHardness Distribution CurveT2SL,T2SA,T2SX (40-55 HSC.)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.


HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 40 ~ 58 40 ~ 70 0.2 ~ 2.0 13 ~ 23 0.2 ~ 1.0 20000

JOURNAL 35 ~ 55 35 ~ 65 0.2 ~ 1.0 12 ~ 20 0.2 ~ 1.0 20000

Typical Analysis Typical Analysis

TTS Symbol Cast Hardness C Si Mn P S Ni Cr Mo

T2SL S 40 ~ 45 1.5 ~ 1.7 0.6 ~ 1.0 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.6 MAX 0.8 ~ 1.2 0.4 MAX T2SA S 42 ~ 47 1.7 ~ 1.9 0.6 ~ 1.0 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.6 MAX 0.8 ~ 1.2 0.4 MAX T2SB S 43 ~ 48 1.9 ~ 2.1 0.6 ~ 1.0 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.6 MAX 0.8 ~ 1.4 0.4 MAX T2SC S 45 ~ 50 2.1 ~ 2.3 0.6 ~ 1.0 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.6 MAX 0.8 ~ 1.4 0.4 MAX T2SX S 45 ~ 55 1.4 ~ 1.8 0.6 ~ 1.3 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.5 ~ 1.0 0.8 ~ 1.2 0.4 MAX T2SS S 50 ~ 58 1.4 ~ 2.2 0.6 ~ 1.0 0.6 ~ 1.0 0.05 MAX 0.05 MAX 0.5 ~ 1.0 0.8 ~ 1.4 0.6 MAX

UNCONTROLLED COPY


Centrifugal casting

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.

Static casting

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNSSSTTTEEEEEELLL BBBAAASSSEEE RRROOOLLLLLL TTT222DDDPPP

DescriptionDescriptionT2DP Steel-base rolls having properties between

those of cast iron rolls and high carbon cast steel rolls. Carbon contents ranges from 1.9 to 2.2 wt.% with

nickel, chromium and molybdenum as alloying elements. With higher content of carbon compound to cast steels, the hardness of T2DP can be controlled between HSC 55 and 65 by adjusting chemical composition and heat treatment processes.

Unique characteristics of Adamite are relatively high hardness while maintaining the levels of strength and toughness for operation requiring both wear resistance and mechanical strength. Microstructure of Adamite consists of hard primary carbide and free(secondary) carbide dispersed in the matrix of bainite.

T2DP rolls are suitable for intermediate and finishing rolling of medium and heavy sections rolling.

ApplicationApplication

Product Type of Mill Position Beam blanks 2 High Intermediate and finishing

Billets 2 and 3 High Intermediate and finishingHeavy section and rail 2 and 3 High Intermediate and finishing

Medium section 2 and 3 High Intermediate and finishingToughness and wear-resisting requirements.

Microstructure × 100Microstructure × 100SHELL STRUCTURE

Bainite matrix with small primary and secondary carbide.

CORE STRUCTURE

Graphitic steel : Fine Pearlite matrix with primary carbides and spheroidal graphite

FCD : Pearlite matrix with nodular graphite

Hardness Distribution CurveHardness Distribution Curve

Mechanical PropertiesMechanical Properties

HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 55 ~ 65 40 ~ 70 0.2 ~ 2.0 13 ~ 23 0.2 ~ 1.0 20000

JOURNAL 35 ~ 55 35 ~ 65 0.2 ~ 1.0 12 ~ 20 0.2 ~ 1.0 20000

Typical AnalysisTypical AnalysisTTS


T2DP S/C 55 ~ 65 1.9 ~ 2.2 0.5 ~ 0.8 0.6 ~ 1.0 0.04 MAX 0.05 MAX 1.0 ~ 2.0 1.2 ~ 2.0 0.5 ~ 0.8

*T2DP core is graphitic steel *TW2DP core is nodular UNCONTROLLED COPY


PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNGGGRRRAAAPPPHHHIIITTTIIICCC SSSTTTEEEEEELLL RRROOOLLLLLL

Description Description Graphitic steel rolls were developed as substitute for Adamite rolls where high thermal stress and large elastic deformation must be absorbed by roll material. With higher content of silicon, carbon also precipitates as nodular graphite. Microstructure of graphitic steels therefore consists of both primary carbide and fine nodular graphite embedded in pearlite matrix. Graphitic steels have higher toughness and ductility than Adamite while the hardness remains in the range that ensures the wear resistance of rolls.


Product Type of Mill PositionPlate 2 High Roughing

Sheet 2 High Roughing

Wide strip 2 High Roughing and Intermediate

Beam blanks 2 High Roughing

Billets 2 High Roughing and Intermediate

Heavy section and rail 2 High Roughing and

Intermediate

Medium section 2 High Roughing and Intermediate

Tough and wear-resisting requirements.


Fine pearlite matrix with primary carbides and spheroidal graphite.

Hardness Distribution CurveHardness Distribution CurveT2SY (40-50 HCS.)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.


HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 40 ~ 53 65 ~ 75 1.0 ~ 3.0 21 ~ 25 0.3 ~ 1.0 20000

JOURNAL 35 ~ 45 60 ~ 70 0.3 ~ 1.5 20 ~ 23 0.3 ~ 1.0 20000



T2SXG S 40 ~ 53 1.6 ~ 1.8 1.0 ~ 1.2 0.6 ~ 1.0 0.05 MAX 0.05MAX 0.8 ~ 1.5 0.8 ~ 1.2 0.4 MAX

T2SY S 40 ~ 50 1.4 ~ 1.7 1.0 ~ 1.4 0.6 ~ 1.0 0.05 MAX 0.05MAX 1.0 ~ 1.5 0.5 ~ 0.9 0.4 MAX

UNCONTROLLED COPY


T8SM (40-55 HSC)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.

PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNNNNOOODDDUUULLLAAARRR CCCAAASSSTTT IIIRRROOONNN (((TTT888SSSMMM)))

Description DescriptionNodular irons are belonged to a group of cast iron

in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the so-called mottled structure. Matrix of nodular iron rolls is fine pearlitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum.

The low nickel grade provides optimal hardness with high strength and toughness which makes it suitable for roughing and intermediate rolling. The medium nickel grade has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness.


Product Type of Mill PositionSeamless tube 2 High Reducing and

SizingBeam blanks 2 High Roughing

Billets 2 and 3 High Roughing and Intermediate


Intermediate


Bar and wire rod 2 and 3 High Roughing and Intermediate


Fine pearlite matrix with small primary carbides and spheroidal graphite.



HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)

BARREL 40 ~ 55 60 ~ 75 1.0 ~ 2.0 20 ~ 23 0.5 ~ 0.8 16000 ~ 17000

JOURNAL 33 ~ 50 45 ~ 65 0.2 ~ 3.0 15 ~ 21 0.2 ~ 0.8 16000 ~ 17000



T8SM S 40 ~ 55 3.2 ~ 3.6 1.6 ~ 2.4 0.2 ~ 0.6 0.08 MAX 0.02 MAX 1.3 ~ 2.5 0.4 MAX 0.4 ~ 0.8

UNCONTROLLED COPY


T8X (40-60 HSC)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.

PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNNNNOOODDDUUULLLAAARRR CCCAAASSSTTT IIIRRROOONNN (((TTT888XXX)))


in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the so-called mottled structure. Matrix of nodular iron rolls is ferritic and pearlitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum.



Product Type of Mill PositionBeam blanks 2 High Roughing

Billets 2 and 3 High Roughing and Intermediate


Intermediate


Bar and wire rod 2 and 3 High Roughing and Intermediate


Ferritic and pearlitic matrix with small primary carbides and spheroidal graphite.



HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)

BARREL 40 ~ 60 50 ~ 65 0.3 ~ 1.0 17 ~ 21 0.2 ~ 0.6 16000 ~ 17000

JOURNAL 33 ~ 50 45 ~ 65 0.2 ~ 3.0 15 ~ 21 0.2 ~ 0.6 16000 ~ 17000



T8X S 45 ~ 60 3.2 ~ 3.6 1.8 ~ 2.4 0.4 ~ 0.6 0.08 MAX 0.02 MAX 0.8 ~ 1.8 0.2 ~ 0.5 0.2 ~ 0.5

UNCONTROLLED COPY


PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNNNNOOODDDUUULLLAAARRR CCCAAASSSTTT IIIRRROOONNN (((TTT888AAA ,,, TTT888AAAMMM)))


in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the so-called mottled structure. Matrix of nodular iron rolls is fine pearlite which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum.



Product Type of Mill Position

Plate 2 High Intermediate and Finishing

Beam blanks 2 High Intermediate and Finishing

Bar and wire rod 2 High Intermediate and Finishing

Heavy section and rail 2 High Intermediate and

Finishing

Medium section 2 High Intermediate and Finishing

Light section 2 High Intermediate and Finishing


Fine pearlite matrix with small primary carbides and spheroidal graphite.


T8A(55-65 HCS.),T8AM (55-70 HSC.)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.


HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)

BARREL 55 ~ 72 40 ~ 60 0.1 ~ 1.0 13 ~ 20 0.1 ~ 0.4 17000JOURNAL 40 ~ 55 35 ~ 60 0.1 ~ 0.8 12 ~ 20 0.2 ~ 0.4 17000



T8A S 55 ~ 65 3.2 ~ 3.6 1.3 ~ 1.8 0.4 ~ 0.6 0.08 MAX 0.02 MAX 2.0 ~ 2.8 0.3 ~ 0.5 0.2 ~ 0.5

T8AM S 55 ~ 70 3.2 ~ 3.6 1.3 ~ 1.8 0.4 ~ 0.6 0.08 MAX 0.02 MAX 2.0 ~ 2.8 0.3 ~ 0.6 0.4 ~ 0.8

UNCONTROLLED COPY


Static castingTH8AM (60-72 HSC)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.

Centrifugal casting

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.

PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNNNNOOODDDUUULLLAAARRR CCCAAASSSTTT IIIRRROOONNN (((TTTHHH888AAAMMM)))

DescriptionDescriptionNodular irons are belonged to a group of cast iron

in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the so-called mottled structure. Matrix of nodular iron rolls is sorbite and bainitic which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum.


ApplicationApplication

Product Type of Mill Position Bar and wire rod 2 High Intermediate and

Finishing




Sorbite and bainite matrix with small primary carbides and spheroidal graphite.

CORE STRUCTURE

FC : Pearlite matrix with flake graphite



Mechanical PropertiesMechanical PropertiesMechanical Properties

HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)

BARREL 60 ~ 72 40 ~ 60 0.1 ~ 1.0 13 ~ 20 0.1 ~ 0.4 17000JOURNAL 40 ~ 55 35 ~ 60 0.1 ~ 0.8 12 ~ 20 0.2 ~ 0.4 17000

Typical AnalysisTypical Analysis


TH8AM S/C 60 ~ 72 3.3 ~ 3.6 0.8 ~ 1.8 0.3 ~ 0.7 0.08 MAX 0.02 MAX 2.9 ~ 3.7 0.6 ~ 1.6 0.4 ~ 0.9

UNCONTROLLED COPY


Centrifugal casting

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.


NNNOOODDDUUULLLAAARRR CCCAAASSSTTT IIIRRROOONNN (((TTT888AAACCC)))


in which most of the carbon crystallizes as spherical particles known as graphite nodules. Remaining carbon combines with iron and chromium to form hard carbide which precipitates during the solidification to form the so-called mottled structure. Matrix of nodular iron rolls is acicular which provides toughness and strength required in rolling operations. Wide range of properties may be obtained by adjusting the three major alloying elements: chromium, nickel, and molybdenum.


Application ApplicationProduct Type of Mill PositionBeam blanks 2 High Intermediate and

FinishingHeavy section and rail 2 High Intermediate



Bar and wire rod 2 and 3 High Roughing,Intermediate and Finishing


Acicular matrix with small primary carbides and spheroidal graphite.

CORE STRUCTURE



Hardness Distribution CurveHardness Distribution CurveStatic casting

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.

MMeecchhaanniiccaall PPrrooppeerrttiieess

HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 50 ~ 75 60 ~ 90 0.2 ~ 0.4 12 ~ 15 0.2 ~ 0.4 17000

JOURNAL 45 ~ 58 50 ~ 75 0.2 ~ 0.5 12 ~ 15 0.4 ~ 0.8 17000

TTyyppiiccaall AAnnaallyyssiiss


T8AC S/C 50 ~ 75 3.3 ~ 3.6 0.9 ~ 1.9 0.3 ~ 1.0 0.05 MAX 0.02 MAX 2.8 ~ 4.3 0.1 ~ 0.8 0.6 ~ 1.0

UNCONTROLLED COPY



AAALLLLLLOOOYYY IIINNNDDDEEEFFFIIINNNIIITTTEEE CCCHHHIIILLLLLLDDeessccrriippttiioonn This roll grade uses iron with high nickel content together with chromium and molybdenum to produce a hard, wear-resisting surface with a combination of tough core which can be produced by static or centrifugally casting. Indefinite chill differs from definite chill in the graphitization of carbon in the microstructure which improves the resistance to firecracking while the remaining free carbide still provides the necessary hardness for wear resistance. Matrix of alloy indefinite chill can be controlled varying from fine pearlite, bainite, martensite or a combination matrix by adjusting chemical compositions. They are suitable for hot rolling of flat products such as intermediate and finishing of plates and strips.

AApppplliiccaattiioonnProduct Type of Mill Position

Plate 2and4 High Intermediate and Finishing

Strip 4 High Finishing

Light Section 2 High Finishing

Bar and wire rod 2 High Finishing

MMiiccrroossttrruuccttuurree ×× 110000SHELL STRUCTURE

Pearlite Martensite & Bainite matrix with primary carbide.

CORE STRUCTURE



HHaarrddnneessss DDiissttrriibbuuttiioonn CCuurrvvee

T7IC 50-75 HSC.

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

mm.

HSC

.

Indefinite chill (60-83 HSC.)

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100mm.

HSC

.


HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 50 ~ 83 35 ~ 55 0.2 ~ 0.5 10 ~ 15 0.1 ~ 0.3 17000

JOURNAL 35 ~ 45 18 ~ 25 / 40 ~ 50 0.2 ~ 0.6 6 ~ 8 / 13 ~ 17 0.1 ~ 0.5 11000 / 16000

TTyyppiiccaall AAnnaallyyssiissTTS


T7IC S 50 ~ 75 3.1 ~ 3.5 0.9 ~ 1.7 0.3 ~ 0.55 0.15 MAX 0.04 ~ 0.07 1.0 ~ 4.0 0.8 ~ 1.5 0.1 ~ 0.5 *T7X C 60 ~ 65 2.9 ~ 3.3 0.8 MAX 0.3 ~ 0.55 0.15 MAX 0.04 ~ 0.07 1.0 ~ 2.0 0.7 ~ 1.0 0.0 ~ 0.3*T7A C 65 ~ 70 3.0 ~ 3.4 0.8 MAX 0.3 ~ 0.55 0.15 MAX 0.04 ~ 0.07 2.2 ~ 2.8 0.7 ~ 1.3 0.2 ~ 0.5*T7B C 70 ~ 75 3.0 ~ 3.5 0.8 MAX 0.3 ~ 0.55 0.15 MAX 0.04 ~ 0.07 3.0 ~ 4.0 1.4 ~ 1.7 0.3 ~ 0.5*T7C C 75 ~ 83 3.0 ~ 3.5 0.8 MAX 0.3 ~ 0.55 0.15 MAX 0.025 ~ 0.06 3.5 ~ 5.0 1.5 ~ 2.0 0.3 ~ 0.5

*T7xx Core is gray cast iron *TW7xx Core is ductile cast iron UNCONTROLLED COPY


PPPRRROOODDDUUUCCCTTT SSSPPPEEECCCIIIFFFIIICCCAAATTTIIIOOONNNAAALLLLLLOOOYYY DDDEEEFFFIIINNNIIITTTEEE CCCHHHIIILLLLLL

DDeessccrriippttiioonn

This roll grade obtains white cast iron at the surface layer by controlling chemical components such as nickel and chromium. The superior high hardness from carbide provides excellent wear resistance required in finishing of strip, wires, and bars. Strength and hardness of materials in this grade can be adjusted by chemical compositions and type of matrix which ranges from pearlite, bainite to martensite.

AApppplliiccaattiioonn

Product Type of Mill PositionStrip 4 High FinishingBar and wire rod 2 High Finishing


Definite chill 65-83 HSC.

0102030405060708090

0 10 20 30 40 50 60 70 80 90 100

m m .

HSC

.

MMiiccrroossttrruuccttuurree ×× 110000

SHELL STRUCTURE

Pearlite Martensite & Bainite matrix with primary carbide no graphite.

CORE STRUCTURE




HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)

ELONGATION ( % )

FATIGUELIMIT

( kg/mm2)

IMPACTTEST

( kg.mm )


( kg/mm2)BARREL 65 ~ 83 25 ~ 35 0.1 ~ 0.3 8 ~ 12 0.1 ~ 0.2 18000

JOURNAL 35 ~ 45 18 ~ 25 / 40 ~ 50 0.2 ~ 0.6 6 ~ 8 / 13~17 0.1 ~ 0.5 11000 / 16000



*T6X C 65 ~ 70 3.1 ~ 3.5 0.3 ~ 0.5 0.2 ~ 0.3 0.2 MAX 0.05 MAX 1.0 ~ 2.0 0.3 ~ 0.5 < 0.15 *T6A C 70 ~ 75 3.1 ~ 3.5 0.3 ~ 0.4 0.2 ~ 0.4 0.2 MAX 0.05 MAX 1.5 ~ 2.0 0.5 ~ 0.7 < 0.15 *T6B C 72 ~ 77 3.1 ~ 3.5 0.3 ~ 0.5 0.2 ~ 0.4 0.2 MAX 0.05 MAX 2.5 ~ 3.0 1.0 ~ 1.3 < 0.20 *T6C C 77 ~ 83 3.1 ~ 3.5 0.7 ~ 0.8 0.3 ~ 0.5 0.2 MAX 0.05 MAX 2.5 ~ 3.5 1.3 ~ 1.5 < 0.35

*T6xx core is gray cast iron *TW6xx core is ductile cast iron UNCONTROLLED COPY



CCCHHHRRROOOMMMIIIUUUMMM IIIRRROOONNN RRROOOLLLLLLSSS (((TTT222HHHCCC)))

DDeessccrriippttiioonnHigh chromium iron rolls are composite rolls

manufactured by centrifugal or spin casting technique. Since chromium carbide is higher in hardness than ferrous carbide, these rolls exhibit high hardness and wear resistance contributing to their excellent performance. Exhibited throughout their use, these rolls can be used in early finishing stands in strip mills.

High chromium iron rolls are spin cast. The high spinning speed creates a centrifugal force to push the molten metal to fill the mold. Vertical casting technology provider excellent bonding between dissimilar shell and core metals. These double poured rolls have high wear resistance properties. Applications for these rolls include all early finishing stands in both hot and cold strip mills, initial finishing stands of plate mills and skin pass mill, and plate finishing stands

AApppplliiccaattiioonn

Product Type of Mill Position

Plate 4 HighInitial Finishing stand and skin pass mills

Wide Strip 4 High Finishing stand in booth hot and cold strip mills.

Tubes Sizing AllBeams universal Horizontal sleeve

MMiiccrroossttrruuccttuurree ×× 110000

SHELL STRUCTURE

Primary chromium carbides acicular with fine globular carbides.

CORE STRUCTURE

FC : Pearlite metrix with flake graphite

FCD : Pearlite metrix with nodular graphite


T2HC(65-85 HSC)


HARDNESS ( HSC. )

TENSILE STRENGTH

( kg/mm2)


( kg/mm2)BARREL 65~85 65~75 21000 / 23000

JOURNAL 35~45 18-25 / 40-50 11000 / 16000



T2HC C 65-85 2.4~3.0 0.5~1.1 0.7~1.5 0.2 MAX 0.05 MAX 0.7~1.5 14.0~20.0 0.7~3.0

UNCONTROLLED COPY

0102030405060708090

100

40 50 60 70 80 90 1000 10 20 30

mm.

HSC

THAI TECH STEEL (2013) CO.,LTD. THAI TECH STEEL (2003) CO ...ttsrolls2013.com/PDF/application...

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