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Grade SUS 630
Corresponding Standard JIS G 4303-2005
Stainless steel bars
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
SUS 630 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Nb
Minimum Value - - - - - 15 3 3 0.15
Maximum Value 0.07 1 1 0.04 0.03 17.5 5 5 0.45
SUS 630 Mechanical Properties
Symbol of heat treatment Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Solution treatment (S) ≤363
H900 (precipitation hardening) ≥1310 ≥1175 ≥10 ≥40 ≥375
H1025 (precipitation hardening) ≥1070 ≥1000 ≥12 ≥45 ≥331
H1075 (precipitation hardening) ≥1000 ≥860 ≥13 ≥45 ≥302
H1150 (precipitation hardening) ≥930 ≥725 ≥16 ≥50 ≥277
1 Approximate Comparison Table Precipitation Hardening Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4
1
(ISO 683-13-1986) 		4542-174-00-I X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
2 Approximate Comparison Table Precipitation Hardening Heat-Resistant Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4 X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
SUS630 Corresponding Standards(Same grade name, different standards)
1 JIS G 4303-2005
SUS 630
2 JIS G 4304-2005
SUS 630 SUS 630-HP SUS 630-HS
3 JIS G 4308-2013
SUS 630
4 JIS G 4305-2021
SUS 630 SUS 630-CP SUS 630-CS

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