Grade 20Cr2Ni4A
Corresponding Standard GJB 1220A-2008
Speification for alloy structure steel bar for artillery parts
Classification Alloy Steel
20Cr2Ni4A Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.17 0.17 0.3 - - 1.25 3.25 -
Maximum Value 0.23 0.37 0.6 0.025 0.025 1.65 3.65 0.25
20Cr2Ni4A Mechanical Properties
diameter
d
mm
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Hardness
HBW
Impact Energy Absorption
KV2
J
d=15 880°C First Quenching, 780°C Second Quenching, Oil Cooling, 200°C Tempering, Water or Air Cooling ≥1180 ≥1080 ≥10 ≥45 - KU2
≥63
Steel Annealing or Tempering - - - - ≤269 -
20Cr2Ni4A Corresponding Standards(Same grade name, different standards)

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