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USA UNS S17700
ASTM
Specification or Grade		 631
Corresponding Standard ASTM A959-2004
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
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
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

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