321 Stainless Steel Sheet

321 Stainless Steel Sheet is a high-performance stainless steel plate based on an austenitic stainless steel matrix, stabilized through the addition of titanium (Ti).

Its core characteristic lies in the ability of titanium to preferentially bond with carbon; this prevents the formation of chromium carbides in high-temperature environments, thereby significantly enhancing the material's resistance to intergranular corrosion.

Key Features

Excellent High-Temperature Resistance: Capable of stable, long-term operation in environments ranging from approximately 400°C to 900°C.

Strong Resistance to Intergranular Corrosion: Ideal for applications involving welding or service in high-temperature environments.

Good Oxidation Resistance: The surface resists oxidation and scaling (spalling) at high temperatures.

Stable Mechanical Properties: Maintains excellent strength and toughness.

Good Processing and Welding Performance: Suitable for cold working, hot working, and welding operations.

In which environments is 321 stainless steel sheet the most cost-effective?

In environments with medium to high temperatures (400-900℃) and intensive welding processes, 321 stainless steel sheet offers the best value. Compared to 304, it eliminates intergranular corrosion defects during welding, significantly extending its service life. Compared to 316L, it eliminates the need for molybdenum costs in scenarios where pitting corrosion and acid resistance are not required. Compared to 310S, 321 is more affordable and its performance is perfectly suited for temperatures below the ultra-high temperature range. This product avoids the high cost of high-end high-temperature resistant stainless steel while mitigating the failure issues of ordinary stainless steel during welding and at medium to high temperatures, making it an economical choice for such applications.

Core Chemical Composition Table

Core Application Areas

1. Boilers and Heat Exchange Equipment: Used in boiler superheaters, heat exchangers, pipe cylinders, etc., suitable for medium to high temperature conditions of 400-900℃.

2. Chemical Pressure Vessels: Suitable for chemical reactors, towers, pipelines, and other equipment structures with dense welding and requiring corrosion resistance.

3. Aerospace: Used in engine exhaust systems, high-temperature pipe fittings, and other components requiring high heat resistance and structural stability.

4. Petroleum Refining Equipment: Used in high-temperature and corrosive environments such as refining heating furnace tubes, flues, and desulfurization and denitrification units.

5. Heat Treatment Equipment: Used for heat treatment furnace linings, fixtures, supports, etc., reducing the likelihood of intergranular corrosion after welding.

6. Marine Engineering and Power Machinery: Used for high-temperature and corrosion-resistant components such as marine high-temperature pipelines and diesel engine exhaust systems.