THE DESCRIPTIONS OF EN 42CRMO4 STEEL |AISI 4140
42CrMo4 is a heat treatable steel which contains at least 0.9%Cr,0.15%Mo as strengthening elements.After quenched and tempered, It obtains high strength, good low-temperature impact toughness with a typical tensile strength of 900 -1200 N/mm2. 42CrMo4 steel has better performance than 34CrMo4 steel due to the higher carbon and chromium content.Similar to AISI 4140,only a little difference in Mn,Cr content.This material also has good machinability,good wear-resistance,but the temper brittleness is not obvious,and poor in weldability. 2.Chemical Composition Grade C Si Mn Cr Mo P S 42CrMo4/1.7225 0.38-0.45 ≤ 0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤ 0.025 ≤ 0.035 42CrMoS4/1.7227 0.38-0.45 ≤ 0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤ 0.025 0.02-0.04 3.Relevant Standards USA UK China Japan France Russia 4140 EN19/708M40 42CrMo SCM440 42CD4 42HM 4. Mechanical Property Diameter d mm ≤ 16 16-40 40-100 100-160 160-250 Thickness t mm < 8 8-20 20-60 60-100 100-160 Yield Strength Mpa ≥900 ≥750...