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Grade Type 431
USA UNS S43100
Corresponding Standard ASTM A 176-1999(R2009)
Standard Specification for Stainless and Heat-Resisting Chromium Steel Plate, Sheet, and Strip
Classification Martensitic Stainless Steel
Type 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
Type 431 Mechanical Properties
Hardness
HBW
HB: ≤285
HRC: ≤29
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
Type431 Corresponding Standards(Same grade name, different standards)
1 ASTM A580/A580M-2018
Type 431 S43100
2 ASTM A 176-1999(R2009)
Type 431 S43100
3 ASTM A580/A580M-2023
Type 431 S43100

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