50Cr21Mn9Ni4Nb2WN 21-4NWNb - GB /T 12773-2021

Grade	50Cr21Mn9Ni4Nb2WN
Other Names
Corresponding Standard	GB /T 12773-2021 Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification	Austenitic Stainless Steel

50Cr21Mn9Ni4Nb2WN Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	N	W	Nb	More
Minimum Value	0.45	-	8	-	-	20	3.5	-	0.4	0.8	1.8	C+N≥0.9
Maximum Value	0.55	0.45	10	0.05	0.03	22	5	0.3	0.6	1.5	2.5	C+N≥0.9

50Cr21Mn9Ni4Nb2WN 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	1160~1200°C Solution treatment + 760~850°C Air cooling	≥950	Rp0.2: ≥580	≥12	≥15	≥28HRC
Bar or Coil	Room Temperature	Solution treatment					≤385
sample		Solution treatment + Aging	High-temperature short-term tensile strength 680	High temperature short-term yield strength 350
sample		Solution treatment + Aging	High temperature short-term tensile strength 650	High-temperature short-term yield strength 330
sample		Solution treatment + Aging	High temperature short-term tensile strength 610	High temperature short-term yield strength 310
sample		Solution treatment + Aging	High Temperature Short-Term Tensile Strength 550	High temperature short-term yield strength 285
sample		Solution treatment + Aging	High temperature short-term tensile strength 480	High temperature short-term yield strength 260
sample		Solution treatment + Aging	High temperature short-term tensile strength 410	High temperature short-term yield strength 240
sample		Solution treatment + Aging	High-temperature short-term tensile strength 340	High temperature short-term yield strength 220

Approximate Comparison Table Austenitic Heat-Resistant Steel

China	International Organization for Standardization	European Standard
GB	ISO	EN	Numerical Grade
50Cr21Mn9Ni4Nb2WN	X50CrMnNiNbN 21-9	X50CrMnNiNbN 21-9	1.4882

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