Weldable 321 Stainless Steel Foil

Weldable 321 Stainless Steel Foil possesses excellent high-temperature oxidation and creep resistance, allowing for continuous use at 700-800℃ and intermittent use at 800-900℃. In an air environment at 900℃, the oxidation rate is ≤0.1mm/year, superior to ordinary 304 stainless steel foil. It also exhibits good resistance to intergranular corrosion, verified by EN ISO 3651 standards. It remains stable in environments with nitric acid, acetic acid, organic acids, high-pressure steam, and polythionine, and can withstand harsh working conditions for extended periods without damage, making it suitable for complex scenarios involving high temperatures and coupled corrosion.

 Aerospace: Used in aircraft engine exhaust pipes, combustion chamber components, flexible heat shields, and precision diaphragms for aerospace instruments. Utilizing its high-temperature strength, resistance to thermal fatigue, and excellent weldability, it adapts to the harsh operating conditions of aerospace equipment, ensuring stability in extreme environments.

 Chemical and Petroleum Industry: Suitable for welding containers, towers, heat exchangers, pipelines, and chemical corrosion-resistant gaskets. Particularly suitable for large equipment where post-weld heat treatment is not possible. It can withstand corrosive media such as nitric acid and acetic acid, operating stably under long-term high-temperature and high-pressure environments, reducing equipment maintenance costs.

 Automotive Industry: Used in high-temperature components such as automotive exhaust system manifolds and catalytic converter housings. Its high-temperature resistance and weldability adapt to the complex welding structures of automotive exhaust systems. It also possesses good corrosion resistance, extending the service life of automotive components and contributing to automotive lightweighting and environmental upgrades.

 Energy and Environmental Protection: Applied to boiler superheater tubes, flue gas desulfurization device components, and thermal oxidizers. It can withstand high-temperature flue gas and corrosive media, exhibiting stable performance after welding, ensuring efficient and safe operation of energy equipment, and meeting the stringent requirements of the environmental protection industry.

Henan Tieyao Trading Co., Ltd. adheres to the business philosophy of "customer-centric, market-oriented, and integrity-based development," and the service tenet of "focusing on quality, maintaining credibility, strict management, emphasizing science, and prioritizing service." By controlling costs through streamlined production processes, it can provide competitive pricing and meet the diverse needs of clients in different countries through customized solutions. Furthermore, its comprehensive pre-sales consultation and after-sales support have earned it widespread trust from clients in international cooperation.

Q1: What is the core difference between weldable 321 stainless steel foil and 304 stainless steel foil?

A1: The core difference lies in the addition of titanium. 321 stainless steel foil undergoes titanium stabilization treatment, effectively preventing intergranular corrosion. It requires no heat treatment after welding and has superior high-temperature strength and creep resistance compared to 304 stainless steel foil. 304 stainless steel foil is prone to intergranular corrosion after welding and has poor high-temperature performance, making it unsuitable for high-temperature welding applications.

Q2: What welding methods does weldable 321 stainless steel foil support? What precautions should be taken during welding?

A2: It supports various conventional welding methods such as TIG welding, MIG welding, and manual arc welding. ER321 or ER347 welding materials are recommended for welding. Control heat input to avoid overheating. For multi-pass welding, the interpass temperature should not be too high. No preheating or post-weld heat treatment is required; it can be used directly for welding.

Q3: What is the minimum order quantity? Can you provide free samples?

A3: The minimum order quantity is flexible and can be adjusted according to customer needs. We offer free samples, and sample specifications can be customized according to customer needs to help customers test product performance in advance and meet application requirements.

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