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.
Jiaxiao MTC 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 | 0.47–0.55 | 0.70–1.10 | 0.15–0.40 | 0.90–1.20 | 0.10–0.25 | ≤0.035 | ≤0.035 |
| AISI | 6150 | — | — | — | — | — | — | — |
| JIS | SUP10 | — | — | — | — | — | — | — |
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 — sourced from ISO-certified steel mills.
- Acid Pickling — removal of oxidation and surface impurities.
- Cold Rolling — reduces thickness and enhances dimensional accuracy.
- Annealing (optional) — improves ductility for cold forming.
- Hardening and Tempering — precise heat treatment in controlled atmosphere furnaces.
- Hardening: Heated above the austenitizing temperature (approx. 850°C–880°C) and quenched.
- Tempering: Reheated to 400–600°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 | ≤200 HV | 600–800 N/mm² | Medium | Bright / Polished | Mill / Slit |
| Hardened & Tempered | 40–52 HRC | 1400–1800 N/mm² | High | Blue / Yellow / Polished | Square / Rounded |
Thickness Range: 0.1–5.0 mm
Width Range: 10–500 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
Jiaxiao MTC follows strict tolerance classes according to DIN/EN standards:
- Thickness tolerance: ±0.015–0.070 mm
- Width tolerance: ±0.20–0.80 mm
- Straightness deviation: within R1–R4 class
- Flatness tolerance: ≤0.1–0.3% 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 Jiaxiao MTC
Guangzhou Jiaxiao Material Technology Co., Ltd.
is a trusted manufacturer and exporter of high carbon, alloy, and stainless steel strips in both annealed and hardened & tempered forms.
With over 20 years of experience and advanced facilities for cold rolling, annealing, quenching, and tempering, Jiaxiao MTC provides tailored steel solutions for automotive, spring, tool, and hardware industries.
