301 stainless steel spring strip

Ningbo Qihong Stainless Steel Co., Ltd. has been manufacturing 301 stainless steel spring strips for many years, consistently adhering to material standards such as SUS301, AISI 301, and 1Cr17Ni7, and complying with international specifications such as ASTM A666 and JIS G4313. Leveraging the advantages of Ningbo's concentrated precision stainless steel industry and our years of experience in steel strip processing, we have equipped ourselves with imported production equipment and a full range of testing instruments. We can reliably produce strips in thicknesses from 0.03 to 3.0 mm and widths from 3 to 600 mm, with hardness levels ranging from 1/2H to SH. We offer both stock and custom-made products to meet customer needs. We also handle precision slitting and non-standard sizes. This strip hardens quickly after cold working and maintains stable elasticity. We are currently supplying this product in bulk to industries such as consumer electronics and automotive manufacturing. We offer competitive pricing, provide authoritative material certificates with every batch, and guarantee timely delivery and quality.

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Product Description

As a professional Chinese manufacturer and supplier, Qihong Factory produces 301 stainless steel spring strip featuring a metastable austenitic structure. Through precise cold-working phase transformation control, the material achieves an SH-grade hardness of HV500–600 and a tensile strength exceeding 1500 MPa, with thickness tolerances strictly controlled within ±0.005 mm. It is ideally suited for applications in consumer electronics, automotive components, precision hardware, and related fields.

Product Features:

Metastable Austenitic Structure

301 stainless steel is a metastable austenitic material that undergoes phase transformation during cold working.

Work Hardening Capability

Austenite partially transforms into martensite under compression

Hardness and strength increase with deformation

SH grade hardness reaches HV 500–600

Tensile strength exceeds 1500 MPa

Excellent Elastic Consistency

Uniform elasticity after forming

Ensures stable and consistent spring force

Ideal for high-volume, automated assembly applications

Superior Formability

Strict control of grain size and impurities

No cracking during 90° or 180° bending

Suitable for manufacturing complex-shaped components

Corrosion Resistance

Composition: 16–18% chromium, 6–8% nickel

Resistant to atmospheric corrosion (anti-rust performance)

Surface Finish Options

Available in 2B matte and BA bright finishes

Annealing and polishing create a dense protective film

Provides oxidation and corrosion resistance

No electroplating required, reducing overall costs

Precision Thickness Control

Manufactured using imported precision equipment

Thickness tolerance controlled within ±0.005 mm

Ensures excellent flatness and surface quality

Strict Quality Assurance

Compliant with ISO 9001 standards

Each batch tested for:

Hardness

Tensile strength

Salt spray resistance

Metallographic structure

Full traceability from raw material to finished product

Product Parameters

Item	Parameter
Product Name	301 Stainless Steel Spring Strip/Spring Material
Material Standard	SUS301/AISI 301/1Cr17Ni7, compliant with ASTM A666, JIS G4313
Thickness Range	0.03-3.0mm, custom cutting available
Width Range	3-600mm, slitting tolerance ±0.05mm
Hardness State	1/2H, 3/4H, H, EH, SH, customizable
Surface Condition	2B, BA, Mirror, Matte/Rolled, customizable
Mechanical Properties	Tensile strength 750-1750MPa, Hardness HV 200-600
Quality Certification	ISO 9001 certified, material report included with shipment

Product Applications

Our 301 stainless steel spring strip is widely used in the consumer electronics field. It can be used for mobile phone SIM card tray springs, TWS earphone hinge springs, and laptop hinges. Its stable elasticity ensures smooth operation without jamming, extending the lifespan of end products. In the automotive industry, it's reliably used in critical components such as seat belt retractors and door lock springs. It withstands high-frequency vibration and repeated opening and closing, meeting the fatigue resistance requirements of the automotive industry and preventing failures. It's also suitable for small parts in electrical equipment, such as circuit breaker contacts, relay springs, and miniature motor brushes. Its stable conductivity and consistent elasticity ensure long-term normal operation of equipment and reduce malfunctions. Additionally, it can be used in high-speed rail damping springs and building curtain wall seismic connectors to buffer impact forces and make structures more stable. It can also be used for everyday hardware components, such as anti-loosening washers, precision mold parts, and battery contacts. As long as you need lasting elasticity and wear resistance, this is the perfect choice.