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Grade SUS 631
Other Names
Corresponding Standard JIS G 4305-2021
Cold-rolled stainless steel plate, sheet and strip
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
SUS 631 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
①Where necessary, –CP may be attached after the above symbol of grade to indicate that the product is a plate. Example SUS 310L-CP
②Where necessary, –CS may be attached after the above symbol of grade to indicate that the product is a strip. Example SUS304-CS
SUS 631 Mechanical Properties
thickness
t
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Solid Solution ≤1030 ≤380 ≥20 ≤192
t≤3 Precipitation Hardening (RH950) ≥1230 ≥1030 - HRC
≥40
t>3 Precipitation Hardening (RH950) ≥1230 ≥1030 ≥4 HRC
≥40
t≤3 Precipitation Hardening (TH1050) ≥1140 ≥960 ≥3 HRC
≥35
t>3 Precipitation Hardening (TH1050) ≥1140 ≥960 ≥5 HRC
≥35
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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