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Grade 630
USA UNS S17400
Corresponding Standard ASTM A959-2019
Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Martensitic Stainless Steel
Properties Strength Corrosion Resistance
630 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Nb
Minimum Value - - - - - 15 3 3 0.15
Maximum Value 0.07 1 1 0.04 0.03 17 5 5 0.45
• Unless otherwise indicated, a grade designation originally assigned by the American Iron and Steel Institute (AISI).
1 Approximate Comparison Table Precipitation Hardening Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4
1
(ISO 683-13-1986) 		4542-174-00-I X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
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
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
05Cr17Ni4Cu4Nb
(0Cr17Ni4Cu4Nb) 		S51740 630 SUS 630 STS 630 630 S17400 X5CrNiCuNb 16-4 X5CrNiCuNb 17-4 1.4542 Z6CNU 17-04 X5CrNiCuNb 16-4 1.4542
630 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
630 S17400
2 ASTM A564/A564M-2019(a)
630 S17400
3 ASTM A693-2013
630 S17400
4 ASTM F899-2020
630 S17400
5 ASTM A959-2019
630 S17400
6 GB /T 41157.3-2022
630 05Cr17Ni4Cu4Nb
7 CNS 3477-2016
630

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