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 et high fatigue resistance
- Stable spring properties under cyclic stress
- Superior wear resistance et shock absorption
- Consistent heat treatment response et usinabilité
- 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 et 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 et 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., Ltée.
is a trusted manufacturer and exporter of high carbon, alloy, et bandes d'acier inoxydable in both annealed et hardened & tempered forms.
With over 20 years of experience and advanced facilities for laminage à froid, recuit, trempe, and tempering, Jiaxiao MTC provides tailored steel solutions for automotive, spring, tool, and hardware industries.
