301 stainless steel foil

Key Performance Highlights

The core advantage of Qihong 301 stainless steel foil lies in its excellent work hardening characteristics. In the annealed state, the material exhibits superior ductility, which can easily adapt to subsequent processing links such as stamping and forming; after cold rolling and stamping treatment, its strength and hardness are significantly improved, while it also possesses excellent elasticity, which can accurately match the stringent requirements of high-precision components. Relying on Qihong's years of accumulated experience in precision stainless steel processing and advanced equipment, the product performance is stable and reliable.

This material contains 16-18% chromium and 6-8% nickel, and achieves hardening through the phase transformation from austenite to martensite during the cold rolling process. It can provide a full range of products from annealed (ANN) to extra-hard (SH) states to meet the customized needs of different customers. The tensile strength in the annealed state is not less than 520MPa, and can reach 1300-1500MPa and above in the fully hardened state; its elastic limit is superior to that of conventional 304 stainless steel foil, and it is not prone to fatigue damage even after long-term repeated deformation.

Product Specifications and Parameters

Application Scenarios

With its excellent comprehensive performance, Qihong 301 stainless steel foil has been widely penetrated into multiple high-end manufacturing fields. In the consumer electronics field, it is a core material for folding screen mobile phone hinges and board-to-board connector springs, which can not only reliably support repeated screen folding but also ensure the stability of electrical contact; in the new energy vehicle field, it can be used as soft-pack battery structural components and pressure sensor diaphragms, effectively improving battery energy density and sensing accuracy, and adapting to the industry's lightweight and high-precision development trends; in the rail transit and aerospace fields, it can be used for lightweight carriage interiors, under-skin stiffeners, anti-loosening washers and other components, achieving weight reduction goals while ensuring equipment operation safety; in the precision instrument field, it can adapt to scenarios such as medical device components and semiconductor manufacturing equipment photomask substrates, meeting stringent usage requirements with high flatness and high cleanliness.

Frequently Asked Questions

Q1: How to choose between 301 and 304 stainless steel foil?

A1: The key depends on usage requirements. 301 stainless steel has a more significant work hardening effect, and its strength and elasticity are better after cold processing, making it an ideal choice for elastic components such as springs and hinges; 304 stainless steel has more excellent corrosion resistance, suitable for use in environments prone to rust.

Q2: Can 301 stainless steel foil be welded? Will welding affect performance?

A2: It can be welded by spot welding or laser welding. Considering the thinness of the material, laser welding is recommended to reduce the heat-affected zone and avoid material damage. If elasticity needs to be maintained after welding, subsequent cold processing or heat treatment can be performed without affecting the service performance.

Q3: Can Qihong produce "tearable steel" grade 301 stainless steel foil?

A3: Of course. We have long achieved stable mass production of "tearable steel" (usually referring to thickness < 0.05mm) with specifications of 0.02mm and thinner. The technology is mature and can meet the special needs of high-end electronics, semiconductor and other industries.

Q4: Will 301 stainless steel foil become magnetic after cold processing?

A4: It will exhibit a certain degree of magnetism. The annealed 301 foil is basically non-magnetic or weakly magnetic. After cold rolling and stamping, the internal structure changes to form martensite, resulting in magnetism. This property can be used in scenarios such as electronic shielding.