301 Spring Steel Strip
301 Spring Steel Strip – Ultra-High Strength Alloy for Precision Spring Applications
Engineered for extreme fatigue resistance and dynamic load performance, our 301 Spring Tempered Stainless Steel delivers unmatched tensile strength (≥1,740 MPa) and hardness (HV ≥550), optimized for aerospace springs, automotive suspensions, and electronics requiring superior elasticity and long-term reliability in corrosive environments.
Core Technical Specifications
1. Strength & Hardness Grades
- Spring Tempered (SEH/SH):
- Hardness: HV 550–600+ (exceeding standard Full Hard grades)
- Tensile Strength: ≥1,740 MPa, Yield Strength: ≥1,450 MPa – ideal for high-cycle fatigue applications (>10⁶ cycles).
- Work Hardening Efficiency: Strength gain rate: 14 MPa per 1% area reduction – enables complex spring geometries without annealing.
2. Precision Manufacturing
- Tolerances: Thickness 0.01–1.5mm (±0.005mm), width 2.0–300mm (±0.1mm) – slit-edge, round edge options for exact fit.
- Surface Finishes: 2D, or custom HL hairline/mirror polish/PVD coating for aesthetic and functional needs.
3. Critical Applications
- Aerospace: Aircraft landing gear springs, actuator components with fatigue life >10⁶ cycles.
- Automotive: Suspension springs, seat adjusters – high shock absorption and salt-spray resistance.
- Electronics: Battery contacts, EMI shields – combines high conductivity (0.73 Ω·mm²/m) with non-magnetic properties post-forming.
- Industrial: Conveyor belts, constant-force springs – withstands cyclic stresses in mildly corrosive environments.
4. Competitive Advantages
- Fatigue Resistance: 50% longer lifespan vs. 304 stainless steel under high-stress loads.
- Cost Efficiency: 20% lower cost than specialty alloys with comparable strength-to-weight ratios.
5. Quality & Compliance
- Standards: ASTM A666, ASTAM A240, JIS G4313, – full traceability with MTRs.
- Certifications: RoHS, ISO 9001.
6. Edging Treatment
- Mill Edge – untreated edge, generally with a somewhat uneven contour.
- Slit Edge – edge with the shearing burr not removed.
- Deburred Edge – slit edge from which the burr has been removed
- Round Edge – edge completely rounded.
Our Strict Quality Management System
We follow a comprehensive quality management system, covering raw material procurement and production processes. Each batch of products undergoes rigorous testing and control to meet high–quality standards.
Thickness Inspection
Width Inspection
Surface Inspection
Camber Inspection
Chemical Testing
Tensile Test
Bending Test
Edge Deburred
Narrow Strip Packaging
Strip Coils Packaging
Typical applications
Industries We Served
Why choose us
Discover Our Advantages
Premium-grade precision strip, engineered to meet the exacting specifications.
We have a professional technical team that provides all-around support and services. We help customers solve problems including product selection, and technical consultation.
100 kg
Small MOQ
0.01-1.5 mm
Large Inventory
7-15 Days
Fast Delivery
+-0.005 mm
Tightest Tolerance
Advanced Manufacturing Processes
Our production facilities are equipped with state-of-the-art equipment and cutting-edge technologies that enable us to produce stainless steel strips with unparalleled precision.
Raw Materials: High-Quality Foundation Laying the Cornerstone of Quality
Partnering with leading steel producers like Tisco, we ensure a stable supply of high-quality raw materials for our manufacturing process.
These raw materials strictly control the composition ratio to ensure the precise content of key elements such as chromium and nickel, endowing the stainless steel strip with excellent corrosion resistance and mechanical properties in subsequent processing.
Cold Rolling: Plastic Deformation to Shape Precise Thickness
With high-precision cold rolling equipment, the stainless steel is rolled at room temperature.
Through the pressure of the rolling mill rolls, the material undergoes plastic deformation, gradually rolling the thickness to the target size.
This step not only compresses the thickness but also refines the internal grains, improving the material strength and surface flatness, laying a solid foundation for subsequent processing.
Bright Annealing: Optimizing Structure to Endow a Bright Surface
Bright annealing is a key process for improving the quality of precision stainless steel strips.
Its main purpose is to eliminate the internal stresses and work hardening caused by cold rolling, improve the strip’s microstructure and mechanical properties, and obtain a bright surface.
The bright annealing process is carried out in a bright annealing furnace, which provides a protective atmosphere to prevent oxidation of the strip during heating.
Degreasing: Removing Impurities to Restore a Pure Surface
After cold rolling, the surface of the strip will retain impurities such as rolling oil and iron filings.
The cleaning process uses professional degreasers and cleaning techniques. Through processes such as spraying, brushing, and rinsing, oil and debris are thoroughly removed, restoring the stainless steel strip’s surface to purity.
A clean surface is a key prerequisite for ensuring the effect of subsequent heat treatment and improving the product’s appearance and performance.
Tension Leveling: Precise Shaping to Eliminate Shape Defects
Leveling is an important process for improving the flatness of precision stainless steel strips.
During cold rolling and annealing, the strip may develop defects such as warping and waves, which affect its dimensional accuracy and usage performance.
The leveling process uses a leveling machine to apply appropriate bending and stretching to the strip, correcting its shape and improving its flatness.
Precision Slitting: Custom Cutting to Meet Diverse Needs
With high-precision slitting equipment, the strip is cut into narrow strips of different widths.
The slitting process strictly controls the cutting accuracy to ensure smooth cuts without burrs, making the width tolerance of each narrow strip extremely small to meet the diversified needs of industries such as electronics and precision machinery for different specifications.
Edge condition: Fine Processing to Improve Edge Quality
Edging is a crucial step following slitting.
During slitting, the edges of the strips may become rough or produce burrs, which affect the surface quality and usage performance of the precision stainless steel strips.
The edging process uses specialized edging equipment to grind and polish the edges of the strips, achieving smooth and burr – free edges.
Cutting into Sheets: Custom Sizing for Ready-to-Use Finished Products
Cutting is the process of cutting the precision stainless steel strips to the desired length according to customer requirements.
Common cutting methods include shear cutting and laser cutting.
Shear cutting is a mechanical cutting method that uses shears to cut the strip into specified lengths. Its advantages include high cutting speed and low cost.
Packaging: Protective Transportation to Ensure Quality Delivery
Packaging is the final step in the production of precision stainless steel strips.
Its primary purpose is to protect the strips from damage, corrosion and contamination during transportation and storage.
The packaging process involves cleaning the strips’ surfaces, applying protective films, wrapping with packaging materials and securing with strapping or pallets.
FAQs About Our Products
What is the difference between full - hard and half - hard stainless steel strips?
Full - hard stainless steel strips undergo special heat treatment to achieve maximum tensile and yield strength with minimal elongation, offering high strength but lower ductility. They are suitable for manufacturing components requiring high strength and dimensional stability, such as springs and fasteners.
Half - hard stainless steel strips balance strength and ductility. They maintain good strength while having moderate ductility, making them suitable for parts that require bending, forming, and stretching, such as electronic device brackets and automotive seat belt springs.
What are the main application fields of precision stainless steel strips?
Our precision stainless steel strips are widely used in multiple industries, including automotive (for manufacturing engine components, exhaust systems, etc.), electronics (for producing electronic connectors, springs, etc.), machinery manufacturing (for making various mechanical components), medical devices (for manufacturing surgical instruments, implants, etc.), and the chemical industry (for producing corrosion - resistant components like gaskets and reaction vessel linings).
Can precision stainless steel strips be customized, and what customized services do we offer?
Yes, we provide comprehensive customization services, including but not limited to dimensions (thickness, width, length), material grades, surface treatments (such as bright annealing, fingerprint - resistant treatment, etc.), and processing methods (cut - to - length, slitting, leveling, etc.), to meet customers' specific application requirements.
What is the dimensional accuracy of precision stainless steel strips, and how do we ensure it?
Our precision stainless steel strips have high dimensional accuracy, with thickness tolerance +/- 0.005 mm and width tolerances controlled within +/- 0.1 mm. We ensure this through advanced cold - rolling technology, high - precision measurement equipment, and strict quality control processes during production.
How does our company ensure the quality and stability of precision stainless steel strips?
We have a comprehensive quality management system covering raw material procurement, production processes, and product testing. Each batch of products undergoes rigorous inspections and tests, including dimensional measurements, mechanical property tests, and corrosion resistance evaluations, to ensure quality and stability.
What are the packaging forms for precision stainless steel strips, and how do we prevent damage during transportation?
Our precision stainless steel strips are packaged in various forms, such as coils and sheets. We use professional packaging materials and methods to prevent damage during transportation. For example, coils are wrapped with moisture - proof paper and secured with strapping bands, while sheets are stacked neatly and protected with corner guards to avoid edge damage.
What certifications do your products have?
Our products hold various certifications, such as ISO 9001:2015, RoHs, MSDS ensuring compliance with international standards and regulations.
What types of precision stainless steel products do you offer?
We mainly offer Austenitic 301, 304, and 316L precision stainless steel strips, slit coils, cut-to-length sheets and foils.
What is the minimum order quantity for precision stainless steel strips?
We strive to meet the needs of all customers. Although we encourage customers to purchase in bulk to enjoy more favorable prices and services, we also accommodate small - order requirements with MOQ of 100 kg. For specific minimum order quantities, please contact our sales team for detailed information.
How long is the delivery period for precision stainless steel strips?
We have an efficient production and supply chain management system and can deliver products quickly. The delivery period depends on the order quantity and product specifications. For regular products, we typically deliver within 7-10 working days. For customized products, the delivery period is negotiated with the customer based on specific requirements.
Do you provide product after - sales support and services?
Yes, we highly value customer satisfaction and provide comprehensive after - sales support and services. If customers encounter any quality issues or usage problems with our products, they can promptly contact our after - sales team. We will respond quickly and offer solutions, such as product replacement, repair, or technical guidance.
How should precision stainless steel strips be stored to ensure their quality during storage?
Precision stainless steel strips should be stored in a dry, ventilated warehouse, away from corrosive substances and environments. They should be placed on pallets to avoid direct contact with the ground and prevent moisture and contamination. Proper storage ensures product quality during storage.
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