321, 321H Stainless Steel Plate

Stainless steel plays a vital role in modern engineering and manufacturing industries due to its excellent corrosion resistance, durability, and versatility. Among the widely used grades, 321 and 321H stainless steel plates stand out as high-performance materials designed for high-temperature and corrosive environments.

Overview of 321 and 321H Stainless Steel Plates

321 stainless steel is a titanium-stabilized austenitic stainless steel designed to prevent carbide precipitation during welding or high-temperature exposure. 321H stainless steel is its higher carbon version, offering improved strength and heat resistance for demanding applications.

These grades are commonly used in industries where materials are exposed to elevated temperatures and aggressive environments.

Product Specifications

321/321H stainless steel plates are available in a wide range of sizes and finishes to meet different industrial requirements.

Thickness Range:

• Cold rolled: 0.3 – 3 mm

• Hot rolled: 3 – 120 mm

Width:

• 500 – 2000 mm

• Common sizes: 1000 mm, 1219 mm, 1500 mm

Length:

• 1000 – 6000 mm

• Standard options: 2000 mm, 2438 mm, 3000 mm, 6000 mm

• Custom sizes available

Surface Finishes:

• No.1, 2B, BA, No.4, HL, 8K, Mirror finish, and more

Standards:

ASME, ASTM, EN, BS, GB, DIN, JIS, etc.

Available Material Grades

This product range includes a wide selection of stainless steel grades:

201, 304, 304L, 316, 316L, 317L, 321, 321H, 347H, 309S, 310S, 904L, S32205, 2507, 254SMO, 32760, 253MA, N08926 and more.

Surface Finishes and Their Applications

Different surface treatments are available depending on the application requirements:

• No.1 Finish – Used in chemical tanks and industrial pipes

• 2B Finish – Ideal for medical equipment, food processing, and kitchen utensils

• No.3 / No.4 Finish – Suitable for construction and decorative applications

• HL (Hairline) – Common in architectural structures

• BA (Bright Annealed) – Used in electrical and kitchen equipment

• 8K Mirror Finish – High-end architectural decoration

Key Applications of 321 Stainless Steel Plate

321 stainless steel offers excellent resistance to intergranular corrosion and high-temperature oxidation, making it ideal for:

• Oil and gas exhaust pipelines

• Engine exhaust systems

• Boiler shells and heat exchangers

• Diesel engine silencing components

• Pressure vessels and chemical transport equipment

• Expansion joints

• Furnace components and spiral welded pipes

Applications of 321H Stainless Steel Plate

321H is designed for higher strength and improved heat resistance, making it suitable for:

• Chemical industry equipment

• Coal and petroleum processing systems

• High-temperature structural components

• Outdoor industrial machinery

• Heat-resistant building materials

• Complex components requiring difficult heat treatment

Key Advantages of 321 / 321H Stainless Steel

• Excellent resistance to high temperatures

• Strong corrosion and oxidation resistance

• Stable performance under welding conditions

• Long service life in harsh environments

• Suitable for both structural and industrial applications

Packaging and Delivery

To ensure safe transportation, stainless steel plates are packed using standard seaworthy packaging (plastic + wooden cases). Customized packaging solutions are also available upon request.

Delivery is typically within 5–7 days after deposit, depending on order quantity.

Conclusion

321 and 321H stainless steel plates are high-performance materials widely used in industries requiring durability, heat resistance, and corrosion protection. With multiple finishes, flexible sizing, and strong mechanical properties, they are ideal choices for petrochemical, power generation, automotive, and construction applications.

For engineers and manufacturers seeking reliable stainless steel solutions, 321/321H plates offer a perfect balance of performance and cost-efficiency.