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Grade 631
USA UNS S17700
Corresponding Standard ASTM A313/A313M-2018
Stainless Steel Spring Wire
Classification Precipitation-Hardening Stainless Steel
Properties Hardness 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 7.8 1.5
631 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa
0.25≤d≤0.38 CH900 2310~2515
0.38＜d≤0.51 CH900 2275~2480
0.51＜d≤0.74 CH900 2240~2450
0.74＜d≤1.04 CH900 2205~2415
1.04＜d≤1.3 CH900 2135~2345
1.3＜d≤1.55 CH900 2100~2310
1.55＜d≤1.8 CH900 2050~2255
1.8＜d≤2.18 CH900 2015~2220
2.18＜d≤2.29 CH900 1945~2150
2.29＜d≤2.54 CH900 1925~2130
2.54＜d≤2.69 CH900 1890~2095
2.69＜d≤3.3 CH900 1875~2080
3.3＜d≤3.5 CH900 1795~2000
3.5＜d≤3.71 CH900 1780~1985
3.71＜d≤4.11 CH900 1765~1970
4.11＜d≤4.57 CH900 1750~1960
4.57＜d≤5.26 CH900 1740~1945
5.26＜d≤5.72 CH900 1710~1915
5.72＜d≤7.77 CH900 1670~1875
7.77＜d≤11.2 CH900 1620~1825
11.2＜d≤15.88 CH900 1585~1795
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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