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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 Precipitation Hardening Stainless Steel
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 Precipitation Hardening Heat-Resistant Steel
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 4305-2021
SUS 631 SUS 631-CP SUS 631-CS

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