Outline for Ferritic Heat-Resistant and Sulfuric Corrosion-Resistant Steels

Applicable Parent Material Welding Consumables （AWS Classification）

Class ASTM/ASME GTAW SMAW GMAW/FCAW* SAW

S-TEN1 1）

（0.3Cu-0.1Sb）ASTM A423 Gr.3ASME CC 2494

NSSW YT-1ST（A5.18 ER70S-G）

NSSW ST-16M（A5.1 E7016）

NSSW SF-1ST （CO2）

（A5.20 E71-1C）

NSSW NB-1ST & NSSW Y-1ST

（A5.17 F7A0-EG）

0.5Mo T1, T1aP1

NSSW YT-505（A5.28 ER80S-G）

NSSW N-0S（A5.5 E7016-A1）

NSSW YM-505 （CO2）

（A5.28 ER80S-G）

NSSW NF-1& NSSW Y-DM

（A5.23 F9P0-EA3-A3）

1Cr-0.5Mo T12P12

NSSW YT-511（A5.28 ER80S-G）

NSSW CM-1A（A5.5 E8016-B2）

NSSW YM-511 （CO2）

（A5.28 ER80S-G）NSSW NB-1CM & NSSW Y-511S

（A5.23 F9P2-EB2-B2）NSSW YM-511A

（MIX）（A5.28 ER80S-G）

2.25Cr-1Mo T22P22

NSSW YT-521（A5.28 ER90S-G）

NSSW CM-2A（A5.5 E9016-B3）

NSSW YM-521A（CO2）

（A5.28 ER90S-G）NSSW NB-2CM& NSSW Y-521

（A5.23 F9P2-EB3-B3）NSSW YM-521A

（MIX）（A5.28 ER90S-G）

HCM2S 2）

（2.25Cr-1.6W-V-Nb）T23P23

NSSW YT-HCM2S NSSW N-HCM2S ― ―

Gr.91（9Cr-1Mo-V-Nb）

T91P91

NSSW YT-9ST NSSW N-9S ― ―

Gr.92（NF616 2））（9Cr-1.8W-V-Nb）

T92P92

NSSW YT-616 NSSW N-616 ― Under developing

HCM12A 2）

（11Cr-2W-0.4Mo-1Cu-V-Nb）

T122P122

NSSW YT-HCM12A NSSW N-HCM12A ― ―

Notes 1) NSSMC’s Sulfuric Corrosion-Resistant Steel for exhaust system. 2) NSSMC’s Ferritic Heat-Resistant boiler tube

Welding Consumables for Coal-fired Power Plant　Nippon Steel & Sumikin Welding Co., Ltd.（NSSW） is a manufacture of welding consumable & equipment as a subsidiary company of Nippon Steel & Sumitomo Metal Corporation（NSSMC） which is a world’s leading company manufacturing boiler tube as well as steel prodacts NSSW is developing, producing and selling all kind of welding consumables matching to NSSMC’s advanced heat-resistant boi ler tube and corrosion-resistant steel for coal-fired power plant. Fig.1 shows transition design of pressure and temperature in steam power plant.

Fig.1 Transition design of pressure steam power plant

Ultra Super Critical Supercritical

16.6MPa

1940 1950 1960 1970 1980 1990 2000 20104000

10

20

30

40

50

450

500

550

600

650

18.6MPa24.1MPa485°C

538°C566°C

600°C 610°C

31MPa

Subcritical

Year S

team

pre

ssur

e (M

PA)

Ste

am te

mpe

ratu

re (℃

) 593°C

Fig.1 Transition design of pressure and temperature in steam power plant

Strategic products for Austenitic Heat-Resistant Stainless Steel

1506（Y）

Pachage of productsDiameter （mm） Product form Unit quantity （kg）

1.0,　1.2 Wound on spool 101.6, 2.0, 2.4 Straight rod* 5

*）Length：1000 mm

NSSW YT-304H and NSSW YT-HR3C were GTAW consumables matching of NSSMC’s Austenitic Heat-Resistant Stainless Steels “Super304H” and “HR3C”, respectively. Their chemical compositions were specially designed to reduce hot cracking, which are often occurred in welding of those full-austenitic stainless steels.

Figure4　Creep rupture properties of GTAW welded joints

Stre

ss [

MPa

]

Rupture time [ hr ]

100908070605040

30

500400

300

200

: Base Metal: Welded Joint

600℃

650℃700℃

10° 101 102 103 104 105

Welding Consumables

Tensile properties Chemical composition （wt.%） ApplicableParent Material

（ASTM）Testtemp.

YS（MPa）

TS（MPa）

EL（%） C Si Mn P S Ni Cr Cu Mo Nb N

NSSW YT-304H 3） RT 500 650 35 0.10 0.3 3.2 .001 .004 16 18 3 0.9 0.6 0.2 Super304H 1）

（S30432）

NSSW YT-HR3CRT 560 790 32

0.06 0.3 1.5 .003 .005 20 27 3 0.9 0.4 0.3 HR3C 2）

（TP310HCbN）550℃ 340 530 31Notes 1） NSSMC’s Austenitic Heat-Resistant Stainless Steels for super-heater 2） NSSMC’s Austenitic Heat and Corrosion-Resistant Stainless Steels 3） Approved by TUV

Fig.2 Creep rupture properties of YT-304H weld joint