ASTM-Class 3

Chemical composition

C(%) V(%) Si(%) Mn(%) P(%) S(%) Cr(%) Mo(%) Ni(%) Cu(%)
C(%)(%) ≦0.45 V(%)(%) ≦0.5 ≦0.45 Mn(%)(%) 0.4-0.9 P(%)(%) ≦0.04 ≦0.45 ≦0.45 ≦0.45 ≦0.45 ≦0.45

Mechanical Properties


YieldRp0.2 (MPa) TensileRm (MPa) ImpactKV/Ku (J) ElongationA (%) Reduction in cross section on fractureZ (%) As-Heat-Treated Condition Brinell hardness (HBW)
612 (≥) 693 (≥) 44 32 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 431

Applications

  • Chromium Molybdenum Steel Forgings for General use

Country Code

  • ASTM

Standard

  • A291


Steel Type
Class 3

Heat treatment
Heat Treatment of steel grade A841 Class3
Heat treated : 1988°C - 1492°C

Relate Steel Type

Steel Type Standard Country Code C(%) V(%) Si(%) Mn(%) P(%) S(%) Cr(%)
SFCM75 4041 CNS ≦0.48 0.15-0.35 0.30-0.85 ≦0.03 ≦0.03 0.9-1.5
SFCM740 G3221 JIS ≦0.48 0.15-0.35 0.30-0.85 ≦0.03 ≦0.03 0.9-1.5
Gr.E A290 ASTM 0.35-0.45 ≦0.06 0.20-0.35 0.7-1.0 ≦0.04 ≦0.04 0.80-1.15
Gr.F A290 ASTM 0.35-0.45 ≦0.06 0.20-0.35 0.7-1.0 ≦0.04 ≦0.04 0.80-1.15
Class 3 A291 ASTM ≦0.45 ≦0.5 0.15-0.35 0.4-0.9 ≦0.04 ≦0.04 ≦1.25