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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
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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