50CrV4 steel is a spring steel, mainly intended for components with applications in the construction, automotive and engineering industries. This grade is characterized by very good mechanical properties, especially high impact strength, tensile strength and fatigue resistance. Elevated manganese and chromium content, affects high hardenability and low susceptibility to tempering embrittlement. The addition of vanadium, as a carbide-forming element, provides a fine-grained structure reduces the rate of martensitic transformation and changes in strength properties during tempering, and reduces the steel's tendency to decarburize.
50CrV4 steel is often used for heavily loaded springs, including those with large cross sections. Another of its advantages is that it can operate at temperatures up to about 300℃. Surface hardened, it retains excellent core strength properties while maintaining adequate surface hardness. After heat treatment characterized by high fatigue and impact resistance. Heat treatment of springs and springs consists of heating to 800-870℃ and quenching in oil or water, followed by medium tempering at 380-520℃. After such heat treatment, the springs acquire the appropriate mechanical properties.
Fatigue strength is also dependent on the structure of the surface layer, so it is necessary to protect springs from decarburization during heat treatment by using a protective atmosphere or salt bath.
Steel 50CrV4 chemical composition
| Designation | C % max | Mn % max. | Si % max | CR% max | P % max. | S % max. | V % max. | |
|---|---|---|---|---|---|---|---|---|
| 50CrV4 | 1.8159 | 0,47 - 0,55 | 0,70 - 1,10 | max 0,40 | 0,90-1,20 | max 0,025 | 0,025 | 0,10-0,25 |
Steel 50CrV4 mechanical properties
| Mechanical properties | ||||
|---|---|---|---|---|
| Rp0,2 [MPa] | Rm [MPa] | Strain [%] | Elongation %] Impact strength [J | Impact strength [J] |
| ≥1200 | ≥1300 | ≥30 | ≥6 | ≥8 |
50CrV4 steel application
50CrV4 steel is used in the manufacture of springs and components operating under high dynamic loads. Thanks to its excellent hardness, fatigue resistance and high mechanical strength, it is a material widely used in the automotive, engineering and tool industries. This steel ensures long service life and reliability in demanding operating conditions.
It is used in the manufacture of components requiring high strength and resilience, in particular:
- springs, steel used in the manufacture of suspension springs, gas springs, or technical springs, where high fatigue resistance is required
- tools and dies, tools requiring high hardness and strength
- drivetrain components, parts such as axles, shafts, crankshafts, engine connecting rods, gears, where high strength and hardness are required.
Steel 50CrV4 designations
| EU EN | Steel number | Russia | USA | China |
| 50CrV4 | 1.8159 | 50ChFa | 6150H | 50CrVa |
Steel 50CrV4 standards
PN-EN 10250-3, PN-EN 10083-3, PN-EN 10277-5
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