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Grade SUS631
Other Names
Corresponding Standard JIS G 4311-2019
Heat-resisting steel bars and wire rods
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
Density 7.93 g/cm3
SUS631 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Al
Minimum Value - - - - - 16 6.5 0.75
Maximum Value 0.09 1 1 0.04 0.03 18 7.75 1.5
SUS631 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≤75mm Solution Heat Treatment (S) ≥1030 ≥380 ≥20 ≤229
Bar; d≤75mm Precipitation Hardening (RH950) ≥1230 ≥1175 ≥4 ≥10 ≥388
Bar; d≤75mm Precipitation Hardening (TH1050) ≥1140 ≥960 ≥5 ≥25 ≥363
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
07Cr17Ni7Al
(0Cr17Ni7Al) 		S51770 631 SUS 631 STS 631 631 S17700 X7CrNiAl 17-7
2
(ISO 683-13-1986) 		X7CrNiAl 17-7 1.4568 Z8CNA 17-07 X7CrNiAl 17-7 1.4568 09Х17Н7Ю
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
07Cr17Ni7Al
(0Cr17Ni7Al) 		S51770 631 SUS 631 STS 631 631 S17700 X7CrNiAl 17-7 X7CrNiAl 17-7 1.4568 Z8CNA 17-07 X7CrNiAl 17-7 1.4568 09Х17Н7Ю
SUS631 Corresponding Standards(Same grade name, different standards)
1 JIS G 4303-2005
SUS 631
2 JIS G 4304-2005
SUS 631 SUS 631-HP SUS 631-HS
3 JIS G 4311-2019
SUS631 SUS631-HR
4 JIS G 4305-2021
SUS 631 SUS 631-CP SUS 631-CS

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