321 stainless steel sheet

321 stainless steel plate is an austenitic stainless steel that contains titanium as a stabilizing element. It exhibits excellent resistance to intergranular corrosion and high-temperature strength. This material performs better than 304 and 316L under high-temperature conditions, making it suitable for applications that require high-temperature and wear resistance.

Physical and Chemical Properties

Density: 7.93 g/cm³

Hardness: Cold-rolled plates have a smooth surface, while hot-rolled plates have a rougher surface.

Dimensions: Common sizes for cold-rolled plates are 1000×2000 mm, 1219×2438 mm, and 1500×3000 mm, with thicknesses ranging from 0.3 to 6 mm. Common sizes for hot-rolled plates are 1500×6000 mm, 1800×6000 mm, 2000×6000 mm, and 2000×8000 mm, with thicknesses ranging from 3 to 200 mm.

Production Process

321 stainless steel plates are produced as either cold-rolled or hot-rolled plates, which differ in surface appearance and dimensions:

Cold-Rolled Plates: These have a bright or silver-white finish and a smoother surface.

Hot-Rolled Plates: These typically have a darker, often brownish surface and a rougher texture.

Applications

321 stainless steel plates are widely used in the following fields:

Oil and gas combustion pipelines

Engine exhaust systems

Boiler casings, heat exchangers, and heating furnace components

Muffler components for diesel engines

Chemical transport vehicles

Expansion joints

Spiral welded pipes for furnace pipelines and dryers

Corresponding Grades in Various Countries

In the United States: ASTM A240/A167 321

In Europe: EN 1.4541

In China: GB/T 1220-2007 06Cr18Ni11Ti

In Japan: JIS G4304 SUS 321

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Common Questions and Answers:

Q: What is the advantage of using 321 stainless steel over other stainless steel alloys?

A: The addition of titanium in 321 stainless steel provides improved resistance to intergranular corrosion and sensitization, particularly in high-temperature applications. It is often preferred in environments where carbide precipitation and subsequent corrosion are concerns.

Q: Is 321 stainless steel suitable for use in applications involving elevated temperatures?

A: Yes, 321 stainless steel is excellent for applications involving elevated temperatures, such as exhaust systems, jet engine parts, and heat exchangers, due to its exceptional high-temperature strength and resistance to oxidation.

Q: Can 321 stainless steel be welded easily?

A: Yes, 321 stainless steel can be readily welded using common welding techniques. However, it is essential to control the welding process to avoid overheating and subsequent loss of corrosion resistance. Post-weld annealing is often recommended to restore the material's properties near the weld zone.

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321 Stainless Steel Sheet