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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 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
3 Approximate Comparison Table Precipitation Hardening Stainless Steel
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
7 ASTM A705/A705M-2023
631 S17700

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