1. Overview
50CrV4, known internationally as AISI 6150 or SUP10, is a chromium-vanadium alloy spring steel that combines high strength, elasticity, and toughness.
It is particularly suitable for automotive suspension springs, clutches, and high-stress mechanical components where resistance to fatigue and shock loading is critical.
Cgood Steel produces 50CrV4 alloy steel strips in hardened and tempered or cold-rolled annealed conditions, ensuring precise control of hardness, surface finish, and dimensional tolerances.
2. Chemical Composition and Equivalent Grades
| Standard | Equivalent Grades | C (%) | Mn (%) | Si (%) | Cr (%) | V (%) | P max | S max |
|---|---|---|---|---|---|---|---|---|
| DIN | 50CrV4 | 0.47鈥?.55 | 0.70鈥?.10 | 0.15鈥?.40 | 0.90鈥?.20 | 0.10鈥?.25 | 鈮?.035 | 鈮?.035 |
| AISI | 6150 | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> |
| JIS | SUP10 | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> | 鈥?/td> |
Chromium improves hardenability and wear resistance, while vanadium refines the grain structure, improving strength and fatigue performance.
3. Production and Heat Treatment Process
50CrV4 strips are produced through a multi-stage precision rolling and thermal treatment process:
- Hot Rolled Coils 鈥?sourced from ISO-certified steel mills.
- Acid Pickling 鈥?removal of oxidation and surface impurities.
- Cold Rolling 鈥?reduces thickness and enhances dimensional accuracy.
- Annealing (optional) 鈥?improves ductility for cold forming.
- Hardening and Tempering 鈥?precise heat treatment in controlled atmosphere furnaces.
- Hardening: Heated above the austenitizing temperature (approx. 850掳C鈥?80掳C) and quenched.
- Tempering: Reheated to 400鈥?00掳C to achieve desired balance between hardness and toughness.
This sequence provides a fine-grained structure with uniform hardness and improved resilience under repeated stress.
4. Mechanical Properties
| Condition | Hardness | Tensile Strength | Elastic Limit | Surface Finish | Edge Options |
|---|---|---|---|---|---|
| Annealed | 鈮?00 HV | 600鈥?00 N/mm虏 | Medium | Bright / Polished | Mill / Slit |
| Hardened & Tempered | 40鈥?2 HRC | 1400鈥?800 N/mm虏 | High | Blue / Yellow / Polished | Square / Rounded |
Thickness Range: 0.1鈥?.0 mm
Width Range: 10鈥?00 mm
Edge Finish: Slit, square, or rounded according to customer requirements.
5. Key Features of 50CrV4 Alloy Steel Strip
- Excellent strength-to-weight ratio and high fatigue resistance
- Stable spring properties under cyclic stress
- Superior wear resistance and shock absorption
- Consistent heat treatment response and machinability
- Uniform flatness achieved through precision levelling and tension control
6. Applications
50CrV4 alloy steel strips are widely used in industries requiring durability under dynamic loads and controlled elasticity:
- Automotive Components
- Leaf springs, clutch plates, valve springs, and safety parts
- Industrial Machinery
- Springs, discs, and precision washers
- Construction Tools
- Trowels, scrapers, and blades with high flexibility requirements
- Power Transmission
- Flexible couplings and dampening elements
Its combination of strength and toughness also makes it suitable for cold-forming operations prior to hardening and tempering.
7. Tolerances and Quality Control
Cgood Steel follows strict tolerance classes according to DIN/EN standards:
- Thickness tolerance: 卤0.015鈥?.070 mm
- Width tolerance: 卤0.20鈥?.80 mm
- Straightness deviation: within R1鈥揜4 class
- Flatness tolerance: 鈮?.1鈥?.3% of strip width
All coils are tested for:
- Chemical composition (spectrometer analysis)
- Hardness and tensile strength (Vickers, Rockwell, and Brinell)
- Surface quality and microstructure
8. Packaging and Delivery
Each 50CrV4 coil is lightly oiled and wrapped in anti-rust paper and plastic film, then placed on wooden pallets or into 20ft sea-worthy containers.
Customized packing and labeling available upon request.
9. About Cgood Steel
Guangzhou Jiaxiao Material Technology Co., Ltd.
is a trusted manufacturer and exporter of high carbon, alloy, and stainless steel strips in both annealed and gehärtet & temperiert forms.
With over 20 years of experience and advanced facilities for Kaltwalzen, Glühen, Abschrecken, and tempering, Cgood Steel provides tailored steel solutions for automotive, spring, tool, and hardware industries.
