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Grade 431S29
Old Grade
Corresponding Standard BS 970-3-1991
Specification for wrought steel for machanical and allied engineering purposes part 3:bright bars for general engineering purposes
Classification Martensitic Stainless Steel
431S29 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu * Mo *
Minimum Value 0.12 - - - - 15 2 - -
Maximum Value 0.2 1 1 0.04 0.03 18 3 0.3 0.3
• For older grades of stainless steel, see Table 2 of standard BS 970-4-1970
431S29 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
d≤150 T 850~1000 ≥680 ≥11 248~302 d＜63: Izod ≥34
d≥63: Izod ≥20
Rod Heat treatment 950~1020°C Softening
≤277
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 Stainless Steels for Cold Heading and Cold Extruding
China Japan South Korea United States International Organization for Standardization Germany United Kingdom
GB JIS KS ASTM/AISI ISO DIN EN/DIN BS EN/BS
1Cr17Ni2 SUS431 STS431 431 X17CrNi16-2 X20CrNi17-2 431S29
431S29 Corresponding Standards(Same grade name, different standards)
1 BS 970-3-1991
431S29 (EN57)
2 BS 970-1-1983
431S29 (EN57)
3 BS 970-4-1970
431S29 (EN57)

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