Cold Rolled Stainless Steel Spring Strip

As a leading China manufacturer and supplier, Qihong produces Cold Rolled Stainless Steel Spring Strip in-house. With advanced cold-rolling, heat treatment, and strict end-to-end quality control, our factory ensures consistent elasticity, high tensile strength (800–2000 MPa), hardness (HV 310–600+), and fatigue resistance. Thickness 0.10–1.60 mm, width 10–250 mm; customizable grades, finishes, and standards. It is suitable for automotive, medical, electronics, and industrial applications.

Our product line focuses on the processing and manufacturing of precision stainless steel bars, cold-rolled steel products, and precision fasteners. Relying on advanced production equipment, scientific management processes, professional testing tools, and an experienced technical team, we ensure that every batch of Cold Rolled Stainless Steel Spring Strip leaving the factory meets the stringent requirements of our customers under high-strength, high-stress conditions.

Core Parameters and Technical Specifications

To ensure that our products can adapt to diverse industrial needs, Qihong Stainless Steel Spring Strips have undergone meticulous control in multiple dimensions.

Parameter Category	Details
Steel Grade Selection:	Covers 300 series (301, 304, 316L), 400 series (420, 430), 631, and custom steel grades.
Mechanical Properties:	Tensile strength 800-2000 MPa; Hardness (HV) 310-600+; Excellent fatigue resistance.
Size Range:	Thickness 0.10-1.60mm, Width 10-250mm (customization available).
Surface Treatment:	Bright, matte, or electropolished; Surface roughness Ra 0.2-0.4μm.
Delivery Condition:	Soft (R), Low Hard (DY), Semi-Hard (BY), Cold Hardened (Y), Extra Hard (TY).
Standards:	Complies with JIS G 4313, ASTM A313, GB/T 4240, and YB/T. 5310-2006

Carefully Selected Materials, Precise Fit

We understand the diverse material requirements of different applications, therefore we reject one-size-fits-all solutions.

Our 301 steel is the "mainstay" for high-stress conditions. This steel has an extremely high work hardening rate, and its tensile strength after processing can easily exceed 2000 MPa, making it ideal for manufacturing automotive suspension components, high-strength springs, and aerospace parts.

For applications requiring both corrosion resistance and performance, our 304 steel performs exceptionally well. It remains stable in atmospheric, freshwater, and mildly chemically corrosive environments, and is widely used in medical equipment springs, food machinery parts, and electronic switches.

Furthermore, for harsh marine or highly acidic/alkaline environments, we offer 316L steel; for precision springs requiring extremely high hardness, we offer 420 steel; and for special applications requiring both high strength and corrosion resistance, 631 steel is the ideal choice.

Precision Cold Rolling Process and Heat Treatment

The performance of Cold Rolled Stainless Steel Spring Strip depends not only on the material but also on the processing technology. Qihong employs advanced cold rolling technology to control quality from the source.

The cold rolling process not only endows materials with extremely high dimensional accuracy—thickness tolerance can be controlled within ±0.01mm—but more importantly, it optimizes the internal grain structure of the material. This uniform and dense microstructure allows the spring strip to exhibit consistent elasticity and strength under repeated bending and stress, effectively avoiding waste and rework in the production process.

To address the issue of high-hardness materials becoming brittle, we have introduced a specialized stress-relieving heat treatment process. This step cleverly balances the material's strength and toughness, maintaining high strength while improving its ductility, preventing cracks during stamping or bending, and ensuring that the spring is not prone to failure under long-term dynamic loads.

End-to-End Quality Control

At Qihong, quality is not just a process, but a philosophy that permeates the entire process.

From the moment raw materials enter the warehouse, our professional testing equipment rigorously controls each batch. Whether it's tensile strength testing, hardness testing (HV), corrosion resistance testing, or dimensional accuracy checks, detailed quality inspection reports must be issued. We adhere to scientific management practices, striving to minimize defect rates and ensuring that every roll of steel strip delivered to our customers is a proven, high-quality product.

We strictly follow multiple international and national standards, including JIS, ASTM, and GB/T. This respect for standards has earned us the trust of customers worldwide. Choosing Qihong is choosing a commitment to quality.

Why Choose Qihong?

Located in Ningbo High-tech Zone, we are adjacent to Ningbo Port, possessing a convenient logistics network that enables us to efficiently respond to the needs of our global customers.

• Focus Area: We specialize in precision stainless steel strips, possessing a deep understanding of material properties and processing challenges, and can provide professional technical support to our customers.

• Customization Capabilities: In addition to standard specifications, we support customized chemical compositions, heat treatment processes, and surface treatments to flexibly address special working conditions.

• Service Philosophy: We uphold the service philosophy of "win-win cooperation and mutual prosperity," committed to becoming a trustworthy long-term partner for our customers, not just a simple supplier.

Ningbo Qihong Stainless Steel Co., Ltd. offers more than just cold-rolled stainless steel spring strips; it offers a commitment to precision, strength, and reliability. We are committed to supporting your business growth through high-quality materials, precise manufacturing processes, and attentive service.

As a professional supplier of stainless steel spring strips, we look forward to working with you to achieve mutual benefit and win-win results, and jointly promote the advancement of industrial manufacturing.