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Grade 631
USA UNS S17700
Corresponding Standard ASTM A705/A705M-2023
Standard Specification for Age-Hardening Stainless Steel Forgings
Classification Precipitation-Hardening Stainless Steel
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
Thickness
t
mm		 Mark
Heat Treatment or Condition
Tensile Strength
σb
ksi 		Yield Point
σs
ksi 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
/ Solution Treatment: 1040±15 °C（water quench） Rb: ≤89
HB: ≤229
t≤100 (L) RH950 Hardening or Aging Treatment, ② ≥1280 ≥1030 ≥6 ≥10 RBC: ≥41
HB: ≥388
t≤150 (L) TH1050 Hardening or Aging Treatment, ③ ≥1170 ≥965 ≥6 ≥25 RBC: ≥38
HB: ≥352
* （L）：Longitudinal；（T）：Transverse。
① Either Rockwell C hardness or Brinell is permissible. On sizes of 12.70 mm and smaller, Rockwell C is preferred.
② 955℃ for not less than 10 min, but not more than 1 h. cool rapidly to room temperature. Cool within 24 h to minus 100 ± 75°C, hold not less than 8 h. Warm in air to room temperature. Heat to 510 °C, hold 1 h, air cool.
③ Alternative treatment: 760 °C hold 90 min, cool to 15 ± 3 °C within 1 h. Hold not less than 30 min, heat to 565 °C hold for 90 min, air cool.
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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