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.
|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|
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||≥650||≥550||≥500|
|Tensile Strength Mpa||1100-1300||1000-1200||900-1100||800-950||750-900|
|Reduction of area ,%||≥40||≥45||≥50||≥50||≥55|
42CrMo4 forging temperature:900 – 1100°C ,cooling as slowly as possible in still air or in sand after forged.
- Normalizing: 850 – 880°C,Cooling in air
- Soft Annealing:680 – 720°C,Cooling in furnace
- Stress relieve:450-650°C,Cooling in air
- Hardening:820 – 880°C,oil or water quench
- Tempering:540 – 680°C,Cooling in air
- Treated to improve shearability (+S):Max 255HB
- Soft annealed (+A):Max 241HB
- Pre Quenched and tempered:280-320HB
- Flame or induction hardening:Min 53HRC
|NORMAL HARDENABILITY +H (850°C – hardness HRC – distance mm)|
42CrMo4 has high strength and wear-resistance,widely used in many industries.
Components with high strength and toughness for tools, automotive parts,mechanical engineering, armament components,such as geer wheels,pinions,connecting rods,parts for mechanical engineering.
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