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Grade 40Cr10Si2Mo
Corresponding Standard GB /T 12773-2021
Valve steel and superalloy bars for internal combustion engines
Classification Martensitic Stainless Steel
40Cr10Si2Mo Chemical Element Composition Content (%)
Component C Si Mn P S Cr ⓐ Ni Cu Mo
Minimum Value 0.35 1.9 - - - 9 - - 0.7
Maximum Value 0.45 2.6 0.7 0.035 0.03 10.5 0.6 0.3 0.9
ⓐ According to the requirements of the buyer and as specified in the contract, the Cr content can be adjusted accordingly, with the Cr content range being 10% to 12%
40Cr10Si2Mo Mechanical Properties
condition Test Temperature Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Sample d=25 Room Temperature 1000~1050°C Oil quenching + 700~780°C Air cooling ≥880 Rp0.2: ≥680 ≥10 ≥35 266~325
Bar or Coil Room Temperature Annealed delivery ≤269
sample Quenching + Tempering High Temperature Short-Term Tensile Strength 550 High-temperature short-term yield strength 450
sample Quenching + Tempering High temperature short-term tensile strength 420 High-temperature short-term yield strength 350
sample Quenching + Tempering High temperature short-term tensile strength 300 High temperature short-term yield strength 260
sample Quenching + Tempering High temperature short-term tensile strength 220 High temperature short-term yield strength 180
sample Quenching + Tempering High temperature short-term tensile strength (130) High temperature short-term yield strength (100)
1 Approximate Comparison Table
China Taiwan, China Japan South Korea Germany France European Standard Russia
GB ISC CNS JIS KS DIN EN/DIN W-Nr. NF EN/NF EN GOST
40Cr10Si2Mo
(4Cr10Si2Mo) 		S48140 SUH 3 SUH 3 STR 3 X40CrSiMo 10-2 1.4731 Z40CSD 10 X40CrSiMo 10
X40CrSiMo 10-2 		40Х10С2М
2 Approximate Comparison Table
China Taiwan, China Japan South Korea Germany France European Standard Russia
GB ISC CNS JIS KS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
40Cr10Si2Mo
(4Cr10Si2Mo) 		S48140 3 SUH 3 STR 3 X40CrSiMo 10-2 1.4731 Z40CSD 10 X40CrSiMo 10 1.4731 40Х10С2М
40Cr10Si2Mo Corresponding Standards(Same grade name, different standards)
1 GB /T 20878-2007
40Cr10Si2Mo S48140 (4Cr10Si2Mo)
2 GB /T 1221-2007
40Cr10Si2Mo S48140 (4Cr10Si2Mo)
3 GJB 2294A-2014
40Cr10Si2Mo (4Cr10Si2Mo)
4 GB /T 12773-2021
40Cr10Si2Mo

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