Spring Steel Flat Bar

Spring Steel Flat Bar – Hot Rolled & Oil Heat Treated for Maximum Performance

As a leading manufacturer of spring steel flat bar, we produce high-quality flat steel products engineered for demanding spring and tool applications. Our hot-rolled and oil-quenched flat bar combines high tensile strength with excellent toughness, delivering the elastic performance that spring applications demand.

Product Overview:
Our spring steel flat bar is produced from carefully selected alloy steel raw materials and processed through hot rolling followed by oil heat treatment. This manufacturing route produces a refined microstructure with uniform hardness, excellent spring properties, and consistent quality across every bar.

Available Steel Grades:
• Carbon spring steel: 65Mn
• Silicon-manganese spring steel: 60Si2Mn, 60Si2MnA
• Chromium spring steel: 55Cr3, 55CrMnA, 60CrMnA
• JIS standard grades: SUP6 (9260), SUP9 (5155), SUP9A (5160), SUP10A (6150), SUP11 (51B60)
• Vanadium spring steel: 50CrV4
• Custom grades available on request

Dimensions:
• Width: 38mm – 150mm (custom widths available)
• Thickness: 4mm – 35mm (custom thickness available)
• Length: Custom cut to your specifications
• Tolerance: Precision-machined to meet ASTM, GB, JIS, DIN, and BS standards

Key Advantages:
High Strength & Toughness – Our oil-quenched and tempered flat bar delivers an optimal balance of tensile strength and impact resistance, ensuring springs that don’t break under repeated load cycles.
Excellent Hardenability – Uniform through-hardening means consistent spring performance across the entire cross-section, not just at the surface.
Superior Decarburization Resistance – Controlled heating and quenching minimize surface decarburization, preserving full strength at the critical surface layer.
Outstanding Elasticity – Designed to return to original shape after deflection, with minimal sag or set over millions of cycles.
Excellent Machinability – Consistent hardness and clean surface finish mean easy cutting, punching, and forming in your workshop.

Surface & Coating Options:
Available with various surface finishes and coating options to match your application requirements. Black, pickled, or coated – just let us know what you need.

Applications:
• Automotive leaf springs and suspension components
• Agricultural machinery – plow blades, cultivator parts
• Chain components and conveyor parts
• Industrial springs of all types
• Tool blades and cutting edges
• Clutch and brake components
• General engineering applications requiring high strength flat steel

Production Capacity:
With an annual output of 400,000 tons, we have the scale to handle large-volume orders while maintaining strict quality control. ISO certified manufacturing ensures every batch meets your specifications.

Order Details:
• MOQ: 25 metric tons
• Payment: T/T, L/C
• Delivery: 30 – 40 working days
• Shipping: By sea
• Customization: Full customization available (dimensions, grades, surface treatment)
• Certification: ISO 9001, meets ASTM / GB / JIS / DIN / BS standards

Whether you need standard sizes or custom specifications, we deliver spring steel flat bar that performs. Contact us for a tailored quotation and material test reports.