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Grade 631
USA UNS S17700
Corresponding Standard ASTM A564/A564M-2019(a)
Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
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
631 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Steel Solution heat treatment (A):
1040±15°C (water quenching)		 HRB: ≤98
HB: ≤229
Steel; t≤100 (Longitudinal) Quenching and/or aging (RH950):
955°C, hold for at least 10min but no more than 1h, rapid cooling to room temperature. Cool to -75°C within 24h, hold for at least 8h, heat to room temperature. Heat to 510°C, hold for 1h, air cooling		 ≥1280 ≥1030 ≥6 ≥10 HRC: ≥41
HB: ≥388
Steel; t≤150 (longitudinal) Quenching and/or aging (TH1050):
760°C, hold for at least 90min, cool to 55±3°C within 1h, hold for at least 30min, heat to 565°C, hold for 90min, air cooling		 ≥1170 ≥965 ≥6 ≥25 HRC: ≥38
HB: ≥352
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
3 Approximate Comparison Table
United States International Organization for Standardization France European Standard Russia Sweden United Kingdom
ASTM ISO NF EN/NF EN Numerical Grade GOST SS BS EN/BS
631 X7CrNiAl17-7 Z9CNA17-07 X7CrNiAl17-7 1.4568 09KH17N7YU 2388 301S81
631 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
631 S17700
2 ASTM A564/A564M-2019(a)
631 S17700
3 ASTM A313/A313M-2018
631 S17700
4 ASTM A693-2013
631 S17700
5 ASTM F899-2020
631 S17700
6 ASTM A959-2019
631 S17700

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