55Cr21Mn8Ni2N 21-2N - GB /T 12773-2021 - H2ABC

中文版

Grade	55Cr21Mn8Ni2N
Other Names
Corresponding Standard	GB /T 12773-2021 Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification	Alloy Steel

55Cr21Mn8Ni2N Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	N
Minimum Value	0.5	-	7	-	-	19.5	1.5	-	0.2
Maximum Value	0.6	0.25	10	0.04	0.03	21.5	2.75	0.3	0.4

55Cr21Mn8Ni2N 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	1140~1180°C Solution treated + 760~815°C Air cooling	≥900	Rp0.2: ≥550	≥8	≥10	≥28HRC
Bar or Coil	Room Temperature	Solution treated					≤385
sample		Solution treated + Aging	High temperature short-term tensile strength 640	High temperature short-term yield strength 300
sample		Solution treated + Aging	High temperature short-term tensile strength 590	High temperature short-term yield strength 280
sample		Solution treated + Aging	High temperature short-term tensile strength 540	High temperature short-term yield strength 250
sample		Solution treated + Aging	High temperature short-term tensile strength 490	High temperature short-term yield strength 230
sample		Solution treated + Aging	High temperature short-term tensile strength 440	High temperature short-term yield strength 220
sample		Solution treated + Aging	High temperature short-term tensile strength 360	High temperature short-term yield strength 200
sample		Solution treated + Aging	High temperature short-term tensile strength 290	High temperature short-term yield strength 170

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