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Grade 431
USA UNS S43100
Corresponding Standard ASTM F899-2020
Wrought Stainless Steels for Surgical Instruments
Classification Martensitic Stainless Steel
Properties Corrosion Resistance Forgability
431 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni
Minimum Value - - - - - 15 1.25
Maximum Value 0.2 1 1 0.04 0.03 17 2.5
1 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
14Cr17Ni2
(1Cr17Ni2)
17Cr16Ni2 		S43110
/
S43120 		431 SUS 431 STS 431 431 S43100 X17CrNi 16-2 4057-431-00-X X20CrNi 17-2
(X22CrNi 17) 		1.4057 Z15CN 16-02 X17CrNi 16-2 1.4057 14Х17Н2 2321 431S29
2 Approximate Comparison Table Martensitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
14Cr17Ni2
(1Cr17Ni2) 		S43110 431 SUS 431 STS 431 431 S43100 X20CrNi 17-2
(X 22CrNi 17) 		1.4057 Z15CN 16-02 X17CrNi 16-2 1.4057 14Х17Н2 2321 431S29
3 Approximate Comparison Table Plastic Mold Steel
China Japan United States Germany Sweden
GB ISC JIS ASTM DIN EN/DIN W-Nr. SS
2Cr17Ni2 T25402 SUS 431 431 X22CrNi 17 1.4057 2321
4 Approximate Comparison Table Martensitic Heat-Resistant Steel
China United States Germany European Standard Russia
GB ASTM DIN EN/DIN EN Numerical Grade GOST
1Cr17Ni2
ML1Cr17Ni2 		431 X17CrNi16-2 X17CrNi16-2 1.4057 14KH17N2
20KH17N2
431 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
431 S43100
2 ASTM A493-2009(2013)
431 S43100
3 ASTM A276/A276M-2017
431 S43100
4 ASTM A473-2018
431 S43100
5 ASTM F899-2020
431 S43100
6 ASTM A493-2016
431 S43100
7 ASTM A240/A240M-2020
431 S43100
8 ASTM A959-2019
431 S43100
9 ASTM A479/A479M-2018
431 S43100
10 Q/RP 007-2018
431
11 CNS 3477-2016
431
12 ASTM A 314-2025
431 S43100

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