304 Stainless Steel Spring Strip

Thanks to Qihong's scientific management system, skilled technical team, and complete production and testing capabilities, the customized 304 stainless steel spring strip offers multiple advantages in performance, precision, and quality, specifically as follows:

(I) Precise Hardness Control, Adaptable to Diverse Scenarios

A full range of hardness states is available to meet customer processing and usage requirements. The soft state (annealed state) is suitable for deep drawing and complex bending of precision parts, resulting in excellent forming effects; the semi-hard to super-hard series (1/4H, 1/2H, 3/4H, EH, SH) gradually increases tensile strength and elastic limit through precise cold work hardening treatment, meeting the stringent elasticity requirements of components such as switch springs, contact parts, and anti-loosening washers, ensuring stable performance under long-term stress.

(II) Excellent Corrosion Resistance, Adaptable to Multiple Environmental Conditions

The chemical composition of the material is strictly controlled, with chromium content maintained at 18-20% and nickel content at 8-10%, forming a dense and stable chromium-rich passivation film. It exhibits good corrosion resistance in nitric acid (concentration ≤65%), various organic acids, and alkaline environments, and is not prone to rust or deterioration. The product has a high surface finish, is free of peeling and roller marks, and is easy to clean and sterilize, meeting food-grade and medical device standards, and can be safely used in environments with high hygiene requirements. 

(III) Extreme Dimensional Accuracy, Reducing Processing Losses

Leveraging the company's high-precision production and testing equipment, thickness tolerance of 304 stainless steel spring strip can be controlled within ±0.005mm (precision grade), with a width range supporting 3.0mm-1219mm.  Precision slitting services are also available, with the narrowest slitting width reaching 1.5mm. High-precision leveling machines are used to effectively eliminate "chain bending" in the strip material, ensuring it remains flat after unrolling. This significantly improves the stability of downstream high-speed stamping and automated assembly, reducing processing losses.

(IV) Full-Process Quality Control, Traceable and Reliable Quality

Adhering to the core principle of "building a solid foundation with quality," we have established a full-process quality control system from raw material warehousing to finished product delivery. Raw materials undergo spectral analysis to verify their composition upon arrival. Thickness and width parameters are monitored in real time during production. Finished 304 stainless steel spring strips undergo multiple tests, including hardness testing, salt spray testing, and metallographic analysis, to ensure compliance with ASTM A666, JIS G4313, and ISO 9001 quality management system standards. Each coil of product is assigned a unique production batch number, allowing for traceability of raw materials and production processes. Material certificates and RoHS test reports are also available.

Product Parameter Table

Product Applications

With stable product quality and customized service capabilities, Qihong 304 stainless steel spring strips have been widely used in the manufacturing of precision components in various fields, specifically in the following areas:

(I) Electronics and Semiconductor Field

Used in the manufacture of mobile phone SIM card tray springs, battery contacts, Type-C interface terminals, CPU socket contact pieces, etc. The stable elasticity and low resistance characteristics ensure smooth electronic signal transmission, meeting the miniaturization and high reliability requirements of precision electronic components.

(II) Automotive and New Energy Field

Suitable for car door lock springs, seat belt buckle springs, battery pack buffer sheets, charging pile contacts, etc.  It maintains stable performance under complex working conditions such as vibration and temperature changes, meeting the stringent requirements of the automotive industry for component durability and safety.

(III) Medical and Food Field

Can be used for surgical instrument springs, disinfection equipment accessories, high-end kitchenware elastic components, food conveyor parts, etc.  Its compliance with hygiene standards and corrosion resistance ensures safety in medical and food processing processes. (IV) Industrial and Mechanical Fields

Suitable for precision mold parts, watch mainsprings, electronic scale sensors, chemical equipment seals, etc.  Precise dimensional tolerances and stable mechanical properties can improve the operating accuracy and service life of mechanical components.

Frequently Asked Questions

1. Can the product be customized to non-standard specifications?

Yes. As a source factory, we have a professional engineering team and complete production equipment. We can customize products with specific thickness, width, hardness, surface treatment, and other parameters according to customer-provided drawings, samples, or specific requirements. We provide OEM/ODM services and can assist in solving technical problems during the processing process.

2. How do you ensure that the product material and testing standards are consistent?

We have established a full-process quality control system. Raw materials are verified for composition through spectral analysis, key parameters are monitored in real time during the production process, and finished products must pass multiple tests before shipment. We can provide material certificates (MTC), RoHS test reports, and other documents according to customer requirements. Each roll of product is equipped with a unique production batch number for full-process traceability.

3. What are the product delivery time and logistics services?

We have sufficient stock of standard specifications, resulting in short delivery times; the delivery time for non-standard customized products depends on the complexity of the customization. Our engineering team will optimize the production process to ensure fast delivery. The company is located in Ningbo, Zhejiang, and has a complete logistics system that covers all regions of China and overseas markets such as North America, Europe, Japan, and Southeast Asia, ensuring safe and timely delivery of goods.

4. Do scratches on the product surface affect its use?

We strictly control the production process, resulting in high surface finish and no obvious scratches, peeling, or roller marks. If special applications require extremely high surface quality, BA, 8K/9K mirror surface treatments can be selected. Minor scratches usually do not affect use under normal working conditions. If you have strict requirements for the surface, please communicate with us in advance, and we will optimize the production process accordingly to avoid scratches.