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Grade 42Cr9Si2
Corresponding Standard GB /T 12773-2021
Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification Martensitic Stainless Steel
42Cr9Si2 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.35 2 - - - 8 - -
Maximum Value 0.5 3 0.7 0.035 0.03 10 0.6 0.3
42Cr9Si2 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: ≥590 ≥19 ≥35 266~325
Bar or Coil Room Temperature Annealed ≤269
sample Quenching + Tempering High Temperature Short-Term Tensile Strength 500 High-temperature short-term yield strength 400
sample Quenching + Tempering High temperature short-term tensile strength 360 High-temperature short-term yield strength 300
sample Quenching + Tempering High temperature short-term tensile strength 240 High temperature short-term yield strength 230
sample Quenching + Tempering High temperature short-term tensile strength 160 High temperature short-term yield strength 110
1 Approximate Comparison Table Martensitic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS UNS SAE ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
42Cr9Si2
(4Cr9Si2) 		S48040 SUH 11 SUH 11 STR 11 S65000 HNV3 X45CrSi 9-3 X45CrSi 9-3 1.4718 Z45CS 9 X45CrSi 8
X45CrSi 9-3 		1.4718
1.4718 		40Х9С2 401S45
2 Approximate Comparison Table Valve Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB ISC CNS JIS KS Commercial Grade UNS SAE ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
42Cr9Si2
(4Cr9Si2) 		S48040 1 SUH 1 STR 1 Sil 1 S65007 HNV3 X45CrSi 9-3 X45CrSi 9-3 1.4718 Z45CS 9 X45CrSi 8 1.4718 40Х9С2 401S45
42Cr9Si2 Corresponding Standards(Same grade name, different standards)
1 GB /T 20878-2007
42Cr9Si2 S48040 (4Cr9Si2)
2 GB /T 1221-2007
42Cr9Si2 S48040 (4Cr9Si2)
3 GB /T 12773-2021
42Cr9Si2

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