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Home Material GB /T 12773-2021
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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
50Cr21Mn9Ni4Nb2WN 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 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
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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