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Grade SUH661
Corresponding Standard JIS G 4311-2019
Heat-Resisting Steel Bars and Wire Rods
Classification Austenitic Stainless Steel
Properties Corrosion Resistance
SUH661 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N W Nb Co
Minimum Value 0.08 - 1 - - 20 19 2.5 0.1 2 0.75 18.5
Maximum Value 0.16 1 2 0.04 0.03 22.5 21 3.5 0.2 3 1.25 21
SUH661 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Bar; d ≤ 180 Solution Heat Treatment (S) ≥690 ≥315 ≥35 ≥35 ≤248
Bar; d≤75 Solution heat treatment + aging (H) ≥760 ≥345 ≥30 ≥30 ≥192
1 Approximate Comparison Table Heat-Resistant Stainless Steel
China Taiwan, China Japan South Korea United States Germany European Standard
GB CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. EN Numerical Grade
1Cr22Ni20Co20Mo3W3NbN SUH 661 SUH 661 STR 661 661 R30155 X12CrCoNi 21-20 1.4971 X12CrCoNiMoWNb 21-20-20 1.4971
2 Approximate Comparison Table Deformed High-Temperature Alloy
China Japan United States Germany France
GB JIS Commercial Grade SAE AMS DIN EN/DIN W-Nr. L-Nr. NF EN/NF
(GH19) SUH 661 N 155 HEV1 5531
5585 		X12CrCoNi 21-20 1.4971 1.4974 ATG X
Z12CNKDW 20
3 Approximate Comparison Table Austenitic Stainless Steel
Japan International Organization for Standardization European Standard
JIS ISO Numerical Grade Numerical Grade
SUH661 X12CrNiCoMoWMnNNb21-20-20-3-3-2 4971-314-79-I 1.4971
4 Approximate Comparison Table Deformed High-Temperature Alloy
China Japan United States Germany France Russia
GB JIS Commercial Grade AISI SAE AMS W-Nr. L-Nr. NF EN/NF GOST
GH19 SUH661 N-155 AISI661 HEV1 5531
5532
5585 		1.4971 1.4974 ATG.X
Z12CNKDW20 		ЭИ673
SUH661 Corresponding Standards(Same grade name, different standards)
1 JIS G 4311-2019
SUH661
2 JIS G 4312-2019
SUH661

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