321 stainless steel foil

Product Core Advantages

Based on the company's years of accumulated precision processing experience and strict quality control, the advantages of 321 stainless steel foil have been fully tested in practical applications:

Excellent high-temperature resistance: This foil contains titanium, which forms stable titanium carbide, effectively preventing chromium carbide precipitation and fundamentally solving the problem of intergranular corrosion. Even in high-temperature environments of 450°C to 900°C, it maintains structural stability, significantly extending its service life. Previously, we customized foil for an aerospace company for use in engine heat shields. It worked reliably even when exposed to continuous high temperatures of 600-800°C—no warping, no drop in performance, and it lasted longer than the customer initially expected.

Great corrosion resistance: It holds up well in oxidizing media, water vapor, weak acids and alkalis, and many chemical environments. It’s especially tough in harsh conditions like high-temperature oxidation and sulfidation, making it a perfect stand-in for 304 and 316 stainless steel in high-heat applications. One chemical company used our 321 stainless steel foil as lining for their high-temperature reactor. It stood up to long-term corrosion from the reaction materials, stretching the equipment’s maintenance interval from 3 months to a full year and helping the company cut down on operating costs significantly.

Easy to process and shape: Even though it’s an ultra-thin foil, our precise rolling techniques give it excellent ductility and flexibility. Stamping, bending, lamination, welding—all these secondary processes go smoothly. A while back, an electronic component maker needed a custom-shaped high-temperature heating film.Through precise stamping and welding, we made the foil perfectly fit the complex component structure, meeting the design requirements for miniaturization and high precision of the components. High Purity and Superior Surface Quality:  Our production process utilizes a dual process of vacuum induction melting and electroslag remelting, combined with comprehensive quality control using our company's professional testing equipment. This results in very few inclusions and excellent uniformity in the material. The surface is smooth and free of oxidation, and we can provide various surface treatment options such as BA (bright annealed), 2B, and No.1. One sensor manufacturer required BA-finished 321 stainless steel foil, and our product's surface roughness was controlled to below 0.1μm, perfectly meeting the high-precision sealing requirements of the sensor housing.

Comprehensive Standards for Greater Reliability: Our products strictly adhere to international and domestic standards such as ASTM A240, AMS 5510, and GB/T 4237, and have passed ROHS, REACH, and ISO 9001 quality system certifications. This perfectly aligns with our company's philosophy of "survival through quality." Previously, a certain energy company tendered for gas turbine components, and our products, due to their complete compliance with stringent international standards, successfully won the bid and were supplied in bulk.

Versatile Applications

Aerospace: Ideal for engine parts, thermal shields, and high-temperature sensor housings. Its heat and corrosion resistance keeps equipment running reliably even in extreme conditions.

Energy & Power: Fits gas turbine components, high-temperature heating elements, and thermocouple sheaths—tough enough to handle the rigors of energy conversion and transmission.

Chemical Equipment: Works well as linings for high-temperature reactors, pipe expanders, and gaskets. It resists corrosion from chemical media and stands up to high heat, helping extend equipment life.

Electronics Manufacturing: Used in high-temperature heating films, resistance heating strips, and battery components. With good conductivity, thermal transfer, and stability, it supports efficient performance of electronic parts.

Environmental Engineering: Suitable for exhaust gas treatment systems and catalytic converter liners. It endures high temperatures and corrosive fumes, offering dependable material support for environmental protection equipment.

Product Specifications Details

Frequently Asked Questions

What are the main differences between 321 stainless steel foil and 304 stainless steel foil? 

Answer: The key difference is the titanium element. 321 stainless steel foil contains titanium, which provides stronger resistance to intergranular corrosion and is specifically suitable for high-temperature environments above 450°C; 304 stainless steel foil does not contain titanium, has a relatively lower cost, and is more suitable for general corrosive environments.

Do you support customization? 

Answer: Absolutely. Our company has extensive experience in non-standard customized parts. As long as the customer provides drawings, we can provide personalized services such as size slitting, stamping, and surface polishing to accurately meet the needs of different products.

What is the minimum order quantity? 

Answer: The minimum order quantity for standard products is 50kg. We also support sample requests, with a minimum order of 1kg, making it convenient for customers to conduct preliminary testing and verification.

How long does delivery take? 

Answer: We always adhere to the principle of "efficiency through speed."  Regular products can be delivered in 3-7 days, while customized products require 10-15 days. For urgent orders, we can also provide expedited services to ensure that we do not delay the customer's production schedule.