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Grade 4
Corresponding Standard ISO 683-16-1976
Heat-treated steels, alloy steels and f ree-cutting steels - Part 16 : Precipitation hardening stainless steels
Classification Precipitation-Hardening Stainless Steel
Properties Corrosion Resistance
4 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu More
Minimum Value - - - - - 14 3.5 2.5 Nb+Ta：5×C~0.45
Maximum Value 0.07 1 1 0.04 0.03 15.5 5.5 4.5
Approximate Comparison Table Martensitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
20Cr13
(2Cr13) 		S42020 420J1 SUS 420J1 STS 420J1 420 S42000 X20Cr 13
4
(ISO 683-13-1986) 		4021-420-00-I X20Cr 13 1.4021 Z20C 13 X20Cr 13 1.4021 20Х13 2303 420S37
4 Corresponding Standards(Same grade name, different standards)
1 ISO 683-11-1987
(4) 20Cr4H 20Cr4 20Cr4HH 20Cr4HL
2 ISO 683-14-2004
(4) 55SiCr6-3
3 ISO 683-13-1986
4
4 ISO 683-16-1976
4
5 ASTM B122/B122M-2016
(4) B122 C77000
6 AS 1442-2007
4
7 ASTM A485-2014
4 A485 Grade 4 A485 Gr.4

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