The 55SiMnVB Spring Steel Bar is a premium alloy spring steel widely recognized for its excellent hardness, high fatigue resistance, and stable performance under repeated stress. Manufactured by Jiangsu Cunrui Metal Products Co., Ltd., it strictly conforms to international standards such as ASTM, EN, DIN, and JIS. With its optimized chemical composition, including silicon, manganese, vanadium, and boron, this material delivers outstanding wear resistance, toughness, and consistent mechanical properties.
Every batch is supplied with mill test certificates, chemical composition reports, and third-party inspection options. This ensures global buyers can fully trust the quality and reliability of 55SiMnVB Steel Spring Bar for critical industrial applications.
Key Features & Advantages
Excellent fatigue resistance and long-lasting elasticity.
Superior hardness and tensile strength after heat treatment.
Improved wear resistance and stable toughness due to alloying with vanadium and boron.
Reliable performance in demanding mechanical applications.
Full compliance with international quality standards and certifications.
Compared to other spring steel grades, 55SiMnVB Spring Bar provides better fatigue resistance, stable mechanical strength, and reduced risk of cracking under high load conditions.
Applications
The 55SiMnVB Spring Steel Bar is widely used in:
Automotive suspension springs, coil springs, and leaf springs.
Industrial machinery components subjected to dynamic loads.
Railway and heavy-duty equipment requiring long service life.
Agricultural tools, mining machinery, and wear-resistant parts.
Aerospace and defense applications demanding high strength alloys.
Product Specifications & Technical Data
|
Parameter |
Specification |
|
Material Grade |
55SiMnVB Alloy Spring Steel |
|
Standards |
ASTM, DIN, EN, JIS equivalents |
|
Available Shapes |
Round Bar, Square Bar, Flat Bar, Rod |
|
Size Range |
Diameter: 8mm – 300mm; Thickness: 5mm – 80mm; Length: 1m – 12m (customized) |
|
Surface Finish |
Black, Bright, Polished, Peeled, Turned, Ground |
|
Heat Treatment |
Annealed, Quenched & Tempered, Normalized |
|
Hardness (HRC) |
Annealed: 180–220 HB; After Heat Treatment: 45 – 55 HRC |
|
Tensile Strength (MPa) |
900 – 1250 |
|
Yield Strength (MPa) |
600 – 850 |
|
Elongation (%) |
≥ 10 |
|
Impact Toughness |
≥ 25 J (depending on heat treatment and thickness) |
|
Modulus of Elasticity |
205 – 210 GPa |
|
Density |
7.85 g/cm³ |
Typical Chemical Composition (%)
|
Element |
Content (%) |
|
Carbon (C) |
0.52 – 0.60 |
|
Silicon (Si) |
1.20 – 1.60 |
|
Manganese (Mn) |
0.60 – 0.90 |
|
Phosphorus (P) |
≤ 0.030 |
|
Sulfur (S) |
≤ 0.030 |
|
Vanadium (V) |
0.05 – 0.12 |
|
Boron (B) |
0.001 – 0.005 |
|
Iron (Fe) |
Balance |
Customization Services
Non-standard sizes and shapes available upon request.
Processing options: cutting, bending, drilling, machining, welding.
Surface treatments: polishing, shot blasting, oiling, or protective coating.
OEM/ODM production according to drawings and special requirements.
Flexible minimum order quantity (MOQ) to support both small and bulk orders.
Pricing & Delivery
We provide competitive pricing with discounts for bulk orders. Standard sizes are available from stock for quick shipment, while customized orders are delivered within 10–25 days depending on complexity.
Our Strength
Over 15 years of spring steel production and export experience.
Advanced facilities with an annual production capacity exceeding 60,000 tons.
Certified by ISO, SGS, and other international organizations.
Strong technical team and R&D capability to provide professional solutions.
Exported to more than 60 countries worldwide.
Service & Support
Fast inquiry response and professional technical consultation.
Packaging meets international shipping standards to ensure safe delivery.
Full quality inspection before shipment with test reports available.
Clear after-sales policy for returns or replacements in case of quality issues.
Long-term partnership approach to support customer growth.
FAQ
Q1: Do you provide testing certificates for 55SiMnVB Spring Steel Bar?
A1: Yes, we provide MTC, composition reports, and third-party inspection if required.
Q2: Can you manufacture based on our technical drawings?
A2: Yes, OEM/ODM service is available, including machining, cutting, and welding.
Q3: What is your minimum order quantity (MOQ)?
A3: Flexible MOQ; we can supply from 1 ton for standard sizes.
Q4: How fast can you deliver?
A4: In-stock items can be shipped within 7–10 days. Customized orders take 15–25 days.
Q5: Which regions do you export to?
A5: Jiangsu Cunrui Metal Products Co., Ltd. exports to Europe, North America, Southeast Asia, the Middle East, and many other regions.
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