Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of en 50crmo4 1.7228 alloy steel bar in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
EN 50CrMo4 1.7228 Alloy Steel Bar / Rod
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.
APPLICATIONS
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.
Equivalent grades of steel 50CrMo4 (1.7228) Only for reference
| EU EN |
Germany DIN,WNr |
England BS |
China GB |
Inter ISO |
| 50CrMo4 | 50CrMo4 | 708M40708M50 | 50CrMo | 50CrMo4 |
Chemical Requirements, Composition, %
| C | Si | Mn | P | S | Cr | Mo |
| 0.46 - 0.54 | max 0.4 | 0.5 - 0.8 | max 0.025 | max 0.035 | 0.9 - 1.2 | 0.15 - 0.3 |
50CrMo4 - General Mechanical Properties
|
Standard |
Steel Grade |
Yield strength σs/MPa (>=) |
Tensile strength (MPa) |
Elongation % (>=) |
Reduction of area ψ/% (>=) |
Impact absorbing energy Aku2/J (>=) |
Hardness HB |
|
EN 10083-3 |
50CrMo4 |
900 |
1100-1300 |
9-11 |
40 |
30 |
248 |
Processing Heat treatment recommendations
| Treatment | Condition | Temperature cycle | Cooling/quenching |
|---|---|---|---|
| Hot forging |
850-1100 |
In still air |
|
| Normalizing | +N |
840-880 |
In still air |
| Soft annealing | +A |
700-730/2h |
15ºC/h to 600ºC, then still air |
| Stress relieve annealing | +SRA |
525-620 |
In still air |
| Hardening | +Q |
830-860 820-850 |
In oil In water |
| Tempering | +T |
525-625/1h |
FAQ
Q: How does 50CrMo4 differ from 42CrMo4 in actual application?
A: 50CrMo4 has a higher carbon content (0.46-0.54%) than 42CrMo4 (0.38-0.45%). This gives 50CrMo4 higher hardness, yield strength, and wear resistance after quenching and tempering, making it better for heavy-duty gears, crankshafts, and high-stress fasteners.
Q: Is 50CrMo4 suitable for welding without preheating?
A: No, it is not. The medium-high carbon content makes it highly susceptible to cold cracking during welding. If welding is absolutely necessary, you must preheat to 200-300°C, use low-hydrogen electrodes, and perform post-weld stress relieving immediately.
Q: What is the recommended heat treatment to get the best toughness?
A: Austenitize at 830-860°C, oil quench, and temper between 525-625°C. Water quenching should be avoided for thick sections due to the risk of quench cracking. Proper tempering is essential to balance strength and impact toughness.
Q: Do you provide Jominy hardenability curves for specific heats?
A: Yes, we can arrange a Jominy end-quench test through a third-party lab for your specific heat number. This is crucial for thick-section parts, as it guarantees the steel will harden to the required depth and core strength.
Q: Are these bars supplied in the annealed or pre-hardened condition?
A: We supply them mostly in the soft-annealed condition (max 248 HB) at our in-house base, which is best for your machining and cutting processes. If you need pre-hardened material, we can arrange it through our partner heat treaters.
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