42CrMo4 round bar 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.
Chemical Composition of 42Crmo4 round bar
| 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 |
Relevant Standards Of 42Crmo4 steel bar
| USA | UK | China | Japan | France | Russia |
| 4140 | EN19/708M40 | 42CrMo | SCM440 | 42CD4 | 42HM |
Applications Of 42Crmo4 round bar
42CrMo4 has high strength and wear-resistance,widely used in many industries.
Components with high strength and toughness for tools, hydraulic cylinder piston rods, cylinder shafts, 4140 hot rolled steel bars, 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