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.
1.Supply Form & Size & Tolerance
Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm
Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm
Plate/Sheet:Thickness :20-400mm xWidth:80-1000mm,Length:2000-6000mm
Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm
|Surface Finish||Black-Forged||Black-Rolled||Turned||Grinding||Polished||Peeled||Cold Drawn|
|Tolerance||(0，+5mm)||(0，+1mm)||(0，+3mm)||Best h9||Best h11||Best H11||Best H11|
|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.
Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts,gears