ASTM A312 / A358 Stainless Steel 321 Pipe Supplier: High-Quality 321 / 321H Stainless Steel Seamless Pipes. Contact us for ASME SA312 321 Stainless Steel Pipes today.

Type 321 stainless steel is an austenitic steel that excels in corrosion and oxidation resistance. It boasts a higher titanium and carbon content than Type 304, providing exceptional toughness even at cryogenic temperatures. The titanium in 321 stainless steel prevents harmful carbide precipitation in the heat-affected zone (HAZ) of the weld and offers partial protection against intergranular corrosion. It also reduces embrittlement in high-risk areas of the weld. Commonly used in applications exposed to carbide precipitation temperatures (800°F-1500°F) and corrosive environments, 321 stainless steel is identical to 304 stainless steel but includes more nickel, stabilized with titanium. This interaction with carbon prevents the formation of chromium carbides at grain boundaries, maintaining corrosion resistance by minimizing chromium consumption near grain borders during exposure to critical temperatures. This grade hardens well with cold working, is easily weldable, and rarely requires post-weld annealing to retain its outstanding performance in various corrosive conditions.

Chemical composition of 321 stainless steel pipe

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GENERAL PROPERTIES

• 321 Stainless Steel Pipe (UNS S32100) is a titanium-stabilized austenitic stainless steel renowned for its excellent corrosion resistance. It offers high resistance to intergranular corrosion after exposure to the chromium carbide precipitation temperature range of 800 - 1500°F (427 - 816°C). The alloy withstands oxidation up to 1500°F (816°C) and provides superior creep and stress rupture properties compared to 304 and 304L steel pipes. Additionally, it boasts good low-temperature toughness.
• Stainless Steel Tube 321H (UNS S32109) is a higher carbon variant (0.04 - 0.10) of the alloy. It is engineered for enhanced creep resistance and strength at temperatures exceeding 1000°F (537°C). The carbon content frequently allows for dual certification.
• Alloy 321 can only be hardened by cold working, not heat treatment. It is easily welded and processed using standard shop fabrication techniques.

COMMON APPLICATIONS

• Aerospace - Piston engine manifolds
• Chemical Processing
• Expansion Joints
• Food Processing - Equipment and storage
• Petroleum Refining - Polythionic acid service
• Waste Treatment - Thermal oxidizers

ASTM/ASTE : UNS S32100

CORROSION RESISTANCE

• Offers excellent general corrosion resistance, comparable to 304.
• Designed for use in the chromium carbide precipitation range of 1800 - 1500°F (427 - 816°C).
• Suitable for use in most diluted organic acids at moderate temperatures.
• Effective in pure phosphoric acid at lower temperatures.
• Works well in up to 10% diluted solutions at elevated temperatures.
• Resists polythionic acid stress corrosion cracking in hydrocarbon service.
• Suitable for chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for use in chloride solutions, even in low concentrations, or in sulfuric acid service.

PROCESSING

Alloy 321/H can be effortlessly welded and processed using standard shop fabrication methods.

HOT FORMING

• Working temperatures of 2100 - 2300°F (1149 - 1260°C) are ideal for forging, upsetting, and other hot working processes.
• Not suitable for work at temperatures below 1700°F (927°C).
• Material must be water quenched or fully annealed after working to restore maximum corrosion resistance.

COLD FORMING

• Highly ductile and easy to form.

WELDING

• Easily welded by most standard processes.
• Post-weld heat treatment is not necessary.

MACHINING

• The hardening rate of 321 makes it less machinable than 410 stainless steel but similar to 304.

Why choose Stainless Steel Pipe 321, 321H, UNS S32100, UNS S32109, WNR 1.4541, WNR 1.4878 manufactured by Daxun?

• Short Lead Time - We pride ourselves on providing rapid, high-quality services for our esteemed clients with the best speed in delivering 321/321H Stainless Steel Pipes and Tubes.
• Customized Sizes: We offer tailored processing to produce and supply both standard and non-standard Stainless Steel 321/321H Tubes, ensuring we meet every unique requirement.
• Best Prices: Our 321/321H Stainless Steel Pipes are priced to be highly competitive, offering excellent value without compromising on quality.
  Quality Products: We are committed to ensuring the highest quality for our SS 321/321H Pipes and Tubes, adhering to rigorous standards at all times.
  Full Certifications: Each product comes fully certified, including Mill TC, Test Reports, and Hydrostatic Tests, verified by NABL approved labs.
• Fittings and Flanges: As a leading manufacturer, we provide 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, offering a one-stop solution for all your needs.

Outstanding Features

• Our SS321/SS321H stainless steel welded pipe stands out due to its pure stainless steel alloy, offering remarkable durability, flexibility, toughness, long service life, high tensile strength, precise dimensions, and excellent surface finish. It also boasts enhanced resistance to pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion.

Comprehensive Testing

• We conduct a series of rigorous tests including positive material identification, intergranular corrosion, pitting resistance, mechanical, chemical, macro/micro, and flattening/flaring tests.

Essential Documentation

• We provide an array of vital documents such as the heat treatment chart, quality assurance plan, commercial invoice, certificate of origin, raw material test report, and material traceability report. Additionally, we offer MTC as per EN 10204/3.1B, radiography test reports, and third-party test reports.