45Cr9Si3 - GB /T 12773-2021

Grade	45Cr9Si3
Corresponding Standard	GB /T 12773-2021 Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification	Martensitic Stainless Steel

45Cr9Si3 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.4	2.7	-	-	-	8	-	-
Maximum Value	0.5	3.3	0.8	0.04	0.03	10	0.6	0.3

45Cr9Si3 Mechanical Properties

condition	Test Temperature	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Sample d=25	Room Temperature	1000~1050°C Oil quenching + 720~820°C Air cooling	≥900	Rp0.2: ≥700	≥14	≥40	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 250	High temperature short-term yield strength 240
sample		Quenching + Tempering	High temperature short-term tensile strength 170	High temperature short-term yield strength 120
sample		Quenching + Tempering	High temperature short-term tensile strength (110)	High temperature short-term yield strength (80)

Approximate Comparison Table Martensitic Stainless Steel

45Cr9Si3 Corresponding Standards(Same grade name, different standards)

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