24 July 2021 Structural Steel Bar
50CrMo4 Structural Steel Bar
50CrMo4 is a high tensile quench and tempering steel with high wear resistance and good toughness. The grade is mainly used for axis and machine components. 50CrMo4 is produced with the quality class IQ (isotropic quality). This ensures a very low number of elongated sulphide inclusions which will give more isotropic properties. The oxidic cleanliness is high and the steel could therefore meet same high demands as for remelted qualities. Through hardenability corresponding to a bar with approx. Ø75mm (oil quenched) Suitable for flame or induction hardening. Delivered as rolled, soft annealed normalized or quench and tempered. Weldable under certain conditions.
50CrMo4 is steel related to 42CrMo4 , 34CrMo4 as well as 25CrMo4 . These standards, apart from practically the same concentration of Chromium and Molybdenum, are distinguished by much lower average carbon content in the chemical composition. 50CrMo4 is one of the last grades that is classified as structural steel for thermal improvement and its only similar steel grade is 50H - not containing Molybdenum. Products with a particular composition are dedicated for vehicles and machines that require high hardness and are subject to strong bending, twisting, abrasion and wear loads. They have a higher yield point than other HM steels.They are used as semi-finished products for the manufacture of components such as crankshafts, cogwheels, heavy-duty axles, gears, valves, heavy-duty screws, thrust rollers, guides, articulated joints, thrust rings, bolts or bushes.For some applications, the steel may exhibit good spring properties. Simple yet proven chemical composition allows for easy welding of parts and mechanical cutting.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Cu(％) |
|---|---|---|---|---|---|---|---|
| 0.42～0.49 | 0.65 ~ 1.10 | 0.75 ~ 1.20 | ≤0.035 | ≤0.040 | 0.15～0.25 | 0.15 ~ 0.30 | ≤0.25 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Elongation δ5 (%): | Reduction of area ψ (%): | Impact energy Akv (J): | Impact toughness value αkv (J/cm2) | Hardness |
|---|---|---|---|---|---|---|
| ≥ 758(85) | ≥ 965(95) | ≥ 14.5 | ≥ 45 | ≥ 41 | ≥ 39(4) | ≥ 285 HB |
50CrMo4 Material Specification Data PDF