welding 304H

Int. Conference WELDS 2009, Fort Myers, Florida; June 24-26;, 2009

Welding of the austenitic alloys Super 304H, 310N and 347H FG

Russel FuchsDr. Herbert Heuser

Int. Conf. WELDS 2009, Fort Myers, FloridaJune 24-26th, 2009

We are the World of Welding Solutions.

WELDS 2009


Plant Hamm


One of the first steam collectors for steam power stations (P91) fabricated in USA in the early 1990`s


Content

State of the art of development, qualification andapplication of filler metals for the new kind of alloys:

- Super 304 H- 310 N- 347 H FG

Ongoing development


Source: After BHE 2005

770 C 770 C

DMV617

700 C

Sanicro 25

Alloy 263

DMV310N

HR3C

DMV304HCu

S304H

670 C640 C

615 C

1.4910

DMV347HFG

Material Selection for Austenitic Superheater Tubes;Supercritical Application

Material Material SelectionSelection forfor AusteniticAustenitic SuperheaterSuperheater TubesTubes;;SupercriticalSupercritical ApplicationApplication

Design

Temperatures

Remark: DMV Grade DMV 304HCu used in shot peened condition


Chemical composition of Superheater / Reheater Boiler Tubes

C Si Mn Fe Cr Ni Mo Cu Nb Ti OtherX3CrNiMoN17-131.4910

max.0,04

max.0,75

max.2,00 Rem.

16,0-18,0

12,0-14,0

2,00-2,80

--

--

--

N 0,10 - 0,18B 0,0015 - 0,0050

HR3C 0,04-0,10

max.0,75

max.2,00 Rem.

24,0-26,0

17,0-23,0

--

--

0,20-0,60

-- N 0,15 - 0,35

DMV310N 0,05-0,07

0,30-0,50

1,00-1,40 Rem.

24,4-25,0

20,8-21,5

--

--

0,40-0,50

-- N 0,18 - 0,24

TP 347H FG 0,04-0,10

max.0,75

max.2,00 Rem.

17,0-20,0

9,0-13,0

--

-- 8 x C

--

Super 304H 0,07-0,13

max.0,30

max.1,00 Rem.

17,0-19,0

7,5-10,5

--

2,50-3,50

0,30-0,60

-- N 0,05 - 0,12

Sanicro 25 max.0,08 ? ? Rem.

22,0-24,0

23,0-25,0

-- ? ?

-- N ?

CCA617NiCr23Co12Mo2.4663

0,05-0,08

max.0,30

max.0,30

max.1,5

21,0-23,0 Rem.

8,0-10,0

max.0,05

max.0,03

0,30-0,50

Co 11,0 - 13,0; B 0,002 - 0,005Al 0,80 - 1,30; Pb max. 0,007As max. 0,010; Bi max. 0,010

Alloy 263 0,04-0,08--

max.0,6

max.0,7

19,0-21,0 Rem.

5,6-6,1

max.0,2

--

1,9-2,4

Co 19,0 - 21,0; Ti + Al 2,4 - 2,8Al max. 0,6; B max. 0,0005

Alloy 740 0,03-0,050,3-1,0

0,1-1,0

max.0,7

23,5-25,5 Rem.

0,2-0,8

--

1,8-2,2

1,4-1,8

Co 18,0 - 22,0Al 0,9 - 1,3

Superheater steels


Chemical composition of austenitic Superheater / Reheater Boiler Tubes

0,05-0,12

0,30-0,60

2,50-3,50

7,5-10,5

17,0-19,0

Rem.max.1,00

max.0,30

0,07-0,13

DMV 304H Cu*

--

8 x C--

9,0-13,0

17,0-20,0

Rem.max.2,00

max.0,75

0,04-0,10

DMV 347H FG

0,18-0,24

0,40-0,50

--

20,8-21,5

24,4-25,0

Rem.1,00-1,40

0,30-0,50

0,05-0,07

DMV 310NNNbCuNiCrFeMnSiC

*) acc. ASME SA-213; code case 2328


Matching Filler Metal for Super 304 H


Matching Filler Metal for Super 304H or DMV 304H Cu / GTAW: Thermanit 304H Cu

Chemical composition of GTA-wire in %

Mechanical properties (all weld metal)

0,210,6316,80,9180,0020,0023,20,40,09NNbCuNiMoCrSPMnSiC

27,919,4462354+650/+120290 82 9455,227,8703533RTGTAW

min. 135+650/+1202min. 85min. 35min. 590min. 235RTBM requirement

CVN (ISO-V) [J]

R. o. A. [%]

Elongation [%]

TS [MPa]

YS [MPa]

Test temp. (C/F)


Matching Filler Metal for Super 304H or DMV 304H Cu / SMAW: Thermanit 304H Cu

Chemical composition (all weld metal) in %


0,2090,382,9116,340,9017,690,0050,0103,340,320,087NNbCuNiMoCrSPMnSiC

39,325,0464350+650/+120288 88 9055,130,1711541RTSMAW

min. 135+650/+1202min. 85min. 35min. 590min. 235RTBM requirement

CVN (ISO-V) [J]

R. o. A. [%]

Elongation [%]

TS [MPa]

YS [MPa]

Test temp. [C/F]


GTA-girth welding of Super 304H (DMV 304H Cu) with matching filler metal Thermanit 304H Cu

Welding parameter: GTA-wire rod: 2,4 mm; root: 75 Amps / 14 Vtop layer: 80 Amps / 14 V

Welding position: PF and PCPreheating: noneInterpass temperature:


Results of GTA-girth welds with Thermanit 304H Cu

Mechanical properties girth weld ( 44,5 x 10 mm; transverse specimen)(Root: rod- 2,0 mm; 100 A; 13 V / Fill passes: rod- 2,4 mm; 135 A; 13 V)

0,450,1893,0515,670,6718,043,330,380,098GTA-wire Thermanit 304H Cu

0,480,1233,188,870,2718,310,690,240,095Base metalNbNCuNiMoCrMnSiC

Chemical composition of GTA-wire in %


22,4521378+500/+932124 130 14223,8727566RT

CVN (ISO-V) [J]

Elongation [%]

TS [MPa]

YS [MPa]

Test temp. [C/F]

BM469+650/+120249 57 67 (A = 0,4 cm)BM / WM617RT

CVN (ISO-V) middle weld [J]

LoFTS [MPa]

Test temp. [C/F]


Results of GTA-girth welds of DMV 304 H Cu with Thermanit 304H Cu

Mechanical properties girth weld ( 44,5 x 10 mm; transverse specimen)(Root: rod- 2,0 mm; 100 A; 13 V / Fill passes: rod- 2,4 mm; 135 A; 13 V)

Test temp. [C/F]

TS [MPa]

LoF CVN (ISO-V) middle weld [J]

RT 617 BM / WM 49 57 67 (A = 0,4 cm)+650/+1202 469 BM

Outside-: 44,5 mm Outside-: 44,5 mm


Thermanit 304 H Cu


Thermanit 304 H Cu

Creep rupture properties of Super 304 H - welds


Welding of Super 304H; 310N and 347H FG

Welding with Ni base filler metal Thermanit 617;

long time creep test are ongoing


Typical analysis base metal and all weld metal NiCr22Co12Mo9 (2.4627); ERNiCrCoMo-1

0,410,00201,20,3011,0Rest8,721,50,040,060,06FM1,20,00261,10,3011,4Rest8,722,20,090,090,06BMFeBAlTiCoNiMoCrMnSiC

Alloy 617

Thermanit 617 is TV approved to use for welding of the newaustenitic steels 347H FG; Super 304H and 310 N


GTA-girth weld: DMV 304H Cu with Ni-base filler metal Thermanit 617

Chemical compositionC Si Mn Cr Mo Ni Nb Cu Al Ti N Co

Base metal 304H Cu 44,5 x 10 mm 0,087 0,2 0,73 18,27 0,25 8,96 0,46 3,02 0,019 - 0,104 -

Filler metal Thermanit 617 0,063 0,32 0,36 22,7 8,9 53,6 - - 1,14 0,41 - 11,59

Mechanical properties at RTYS [MPa] TS [MPa] Elongation [%]

Base metal 304H Cu 44,5 x 10 mm 427 706 40,2

Filler metal Thermanit 617 all weld metal GTAW 477 737 46,5

Welding parameter: wire- 1,2 mm (mechanized welding); 120 Amps / 12 V / vs = 15 cm/min.

Outside- Tube: 44,5 mm Outside- Tube: 44,5 mm


Thermanit 617

Creep rupture properties of Super 304 H welds


Chemical composition tube 310N ( 44,5 x 9,3 mm)

0,200,4621,225,61,150,360,059

NNbNiCrMnSiC

Mechanical properties at RT

46,5737477Thermanit 617 all weld metal41,6771359Tube 310N

Elongation A5 [%]TS [MPa]YS [MPa]

Mechanical properties of girth welds at RT (transverse specimen)

WM715DMV 310NLoFTS [MPa]Tube

Welding parameter: wire- 1,2 mm (mechanised welding); 120 Amps / 12 V; vs = 15 cm/min.

Chemical composition all weld metal Thermanit 617 (GTAW)

55,5

Ni

8,93

Mo

21,7

Cr

0,10

Mn

1,140,4111,10,070,063

AlTiCoSiC

Tube welding DMV 310N with Ni-base filler metal Thermanit 617



695 900Requirement

46,5737477All weld metal Thermanit 617LoF: WM723Weld

44

Elongation A5 [%]

772377Tube 310N 51 x 4,5 mm

RemarksTS [MPa]YS [MPa]

Chemical composition

0,27

0,41

-

Ti

0,557,7??47,05,3522,60,370,170,059Weld

1,1411,1--55,58,921,70,100,070,063All weld metal Thermanit 617

--0,200,46520,9-24,51,180,420,065Tube 310N 51 x 4,5 mm

NNiMoCrMn AlCoNbSiC

Tube welding DMV 310N with Ni-base filler metal Thermanit 617


Thermanit 617

Creep rupture properties of 310 N- welds



46,5737477All weld metal Thermanit 617LoF in BM 347H FG-626-Weld

45,2

61

Elongation A5 [%]

773423Base metal DMV 310N*

632292Base metal DMV 347H FG*

RemarksTS [MPa]YS [MPa]

*) 38 x 6,3 mm

Chemical composition

---0,6545,66,020,440,390,140,049Weld

11,10,411,140,0255,58,9321,750,100,070,063Filler metal Thermanit 617

---0,4420,9-24,41,180,410,070Base metal DMV 310N

-

Al

Base metal DMV 347H FG 11,37

Ni

-

Mo

18,4

Cr

1,48

Mn

--0,90,410,090

CoTiNbSiC

Tube welding 347H FG / 310 N with Ni-base filler metal Thermanit 617


Welding parameter: Filler metal: Thermanit 617GTA-wire rod: 2,0 mm; root: 55-75 Amps / 13-14 V

fill and top layer: 55-75 Amps / 13-14 VWelding position: PF and PCPreheating: noneInterpass temp.:


Creep rupture properties of 347 HFG - welds

Thermanit 617


Main influence:Pre heating temperatureInterpass temperatureHeat inputWeld built upThickness of layersBevel preperationGeometry of jointWeld processWelding parameter

The processing of highly-developed materialsdemands most exact settings and highly-qualified staff.

alloy 230, 263, 617, 740T23, T24

VM12-SHCP92

Ni-BasisSuper 304 H

P23, P24

10CrMo9-1016Mo3; 13CrMo4-5

unalloyed Steels

Parameters

A good weld metal on its own does not guarantee a sound joint , if you do not care for

Power Plant


Conclusions

- Matching filler metals for Super 304H have been developedand qualified.

- Welding with overmatching filler metal Thermanit 617 isapproved for DMV 310N, 347H FG and Super 304H, but care has tobe taken regarding different thermal expansion coefficients.

- Creep rupture tests of weldments are completed or running.

Tests are running up to > 30.000h.


Ongoing investigations

welding of alloys 230, 263, 617mod. and 740

developing of matching filler metals for 310N

welding of dissimilar alloys

Most important issue:

testing the creep rupture properties of thefiller metals in long term tests

Welding of the austenitic alloys Super 304H, 310N and 347H FG Slide Number 2Slide Number 3Slide Number 4Slide Number 5Slide Number 6Slide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15Slide Number 16Slide Number 17Slide Number 18Slide Number 19Slide Number 20Slide Number 21Slide Number 22Slide Number 23Slide Number 24Slide Number 25Slide Number 26Slide Number 27Slide Number 28Slide Number 29

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