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Grade 631
USA UNS S17700
Corresponding Standard ASTM A693-2013
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
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＜t＜102 Solid Solution Treatment ≤1035 ≤380 ≥20 HRB
≤92
0.038＜t＜0.124 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥3 HRC
≥38
0.127＜t＜0.251 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥4 HRC
≥38
0.25＜t＜0.505 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥5 HRC
≥38
0.51＜t＜4.760 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1240 ≥1035 ≥6 HRC
≥38
4.762＜t＜15.88 Precipitation Hardening, 760℃+plus 15℃+566℃ ≥1170 ≥965 ≥7 ≥20 HRC
≥38
0.038＜t＜0.124 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥1 HRC
≥44
0.127＜t＜0.251 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥2 HRC
≥44
0.25＜t＜0.505 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥3 HRC
≥44
0.51＜t＜4.760 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1450 ≥1310 ≥4 HRC
≥44
4.762＜t＜15.88 Precipitation Hardening, 954℃+minus 73℃+510℃ ≥1380 ≥1240 ≥6 ≥20 HRC
≥43
0.038＜t＜1.27 Cold rolled at mill ≥1380 ≥1205 ≥1 HRC
≥41
0.038＜t＜1.27 Cold rolled at mill + 482℃ ≥1655 ≥1580 ≥1 HRC
≥46
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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