Chromium-molybdenum machine construction steel 50CrMo4/1.7228 for thermal improvement in accordance with EN 10083-1.
| Standards | Steel Grades | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | Cu: | |
| EN | 50CrMo4 - 1.7228 | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | <0.4 | <0.025 | <0.035 | 0.9 - 1.2 | 0.15 - 0.30 | - | - | |
| PN | 50H | ||||||||
| 0.47 - 0.55 | 0.5 - 0.8 | 0.17 - 0.37 | <0.035 | <0.035 | 0.8 - 1.1 | - | <0.3 | - | |
| DIN | 48CrMo4 - 48 CrMo 4 - 1.3565 | ||||||||
| 0.46 - 0.52 | 0.5 - 0.8 | <0.4 | <0.025 | <0.035 | 0.9 - 1.2 | 0.15 - 0.30 | - | <0.3 | |
| GOST | 50ChM - 50KhM - 50ХМ | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | <0.4 | <0.025 | <0.035 | 0.9 - 1.2 | 0.15 - 0.35 | - | - | |
| DIN | 50 CrMo 4 | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | <0.4 | <0.035 | <0.035 | 0.9 - 1.2 | 0.15 - 0.30 | - | - | |
| AFNOR | 50CD4 - 50 CD 4 | ||||||||
| 0.46 - 0.54 | 0.5 - 0.8 | <0.4 | <0.025 | <0.035 | 0.9 - 1.2 | 0.15 - 0.30 | - | - | |
| ASTM | AISI 4150 | ||||||||
| 0.48 - 0.53 | 0.75 - 1.00 | 0.75 - 1.00 | <0.035 | <0.040 | 0.8 - 1.1 | 0.15 - 0.25 | - | - | |
Steel 50CrMo4 - Specification and application
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.
50CrMo4 - General mechanical properties
- Tensile strength Rm = 1100 - 1300 MPa
- Yield point Re > 900 MPa
- Notch toughness KV > 30 J
- Elongation, A > 9%
- Contraction, Z > 40%
Heat treatment - processes, temperatures and cooling
- Softening annealing at 680 - 720℃
- Normalizing at 840 - 880℃
- Hardening in oil at 820 - 860℃
- Tempering at 540 - 680℃
Rolex Metal company in the beforementioned grade provides:
Substitutes and other designations of 50CrMo4:
50 CrMo 4, 1.7228, AISI 4150, SCM5, 50CrMo4H, 50CrMo4HH, 50CrMo4HL, 50ChM, 50KhM, 50ХМ, 48CrMo4, 48 CrMo 4, 1.3565, SCM 445, 50CD4, 50 CD 4, 50H.