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Grade 631
USA UNS S17700
Corresponding Standard ASTM A693-2024
Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
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 7.7 1.5
631 Mechanical Properties
Thickness
t
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
t≤0.25 Solid Solution Treatment ≤1035 ≤450 / / /
0.25~102 Solid Solution Treatment ≤1035 ≤380 ≥20 / HRB
≤92
0.038~0.124 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥3 / HRC
≥38
0.127~0.251 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥4 / HRC
≥38
0.25~0.505 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥5 / HRC
≥38
0.51~4.760 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥6 / HRC
≥38
4.762~15.88 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1170 ≥965 ≥7 ≥20 HRC
≥38
0.038~0.124 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥1 / HRC
≥44
0.127~0.251 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥2 / HRC
≥44
0.25~0.505 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥3 / HRC
≥44
0.51~4.760 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥4 / HRC
≥44
4.762~15.88 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1380 ≥1240 ≥6 ≥20 HRC
≥43
0.038~1.27 Cold rolled at mill ≥1380 ≥1205 ≥1 / HRC
≥41
0.038~1.27 Cold rolled at mill + 482℃ ≥1655 ≥1580 ≥1 / HRC
≥46
Note：Reduction of Area：Applicable to tests in the long transverse direction. Transverse to the direction of rolling and parallel to the product surface.
Note：Impact test is not required unless specified on the purchase order.
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
8 ASTM A313/A313M-2018(R2025)
631 S17700
9 ASTM A693-2024
631 S17700

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