ASTM A312 / A358 Stainless Steel 321 Pipe Supplier. Discover premium 321 / 321H Stainless Steel Seamless Pipe tailored for your needs. Reach out to us for ASME SA312 321 Stainless Steel Pipe information and quotations today.

Type 321 stainless steel is a remarkable austenitic steel that closely mirrors the attributes of Type 304, but with a higher titanium and carbon content. This enhanced composition grants it superior corrosion and oxidation resistance, alongside unparalleled toughness even at cryogenic temperatures. The inclusion of titanium delivers various appealing benefits: it prevents detrimental carbide precipitation in the heat-affected zone (HAZ) of welds, offers substantial protection against intergranular corrosion, and mitigates embrittlement in susceptible weld areas. Type 321H stainless steel shines in applications subjected to carbide precipitation temperatures (800°F-1500°F) and corrosive environments. Compared to 304 stainless steel, 321 contains more nickel and is stabilized with titanium, which interacts preferentially with carbon, preventing the formation of chromium carbides at grain boundaries. This preserves corrosion resistance by minimizing chromium consumption near grain borders during critical temperature exposure. The grade responds well to cold working, is easily weldable, and rarely necessitates post-weld annealing to maintain its exceptional performance across various corrosive settings.

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 overall corrosion resistance. It boasts superior intergranular corrosion resistance after exposure to the chromium carbide precipitation temperature range of 800 - 1500°F (427 - 816°C). This alloy resists oxidation up to 1500°F (816°C) and demonstrates better creep and stress rupture properties compared to 304 and 304L steel pipes, with impressive low-temperature toughness.
• Stainless Steel Tube 321H (UNS S32109) is a higher carbon content variant of this alloy (0.04 - 0.10), engineered for enhanced creep resistance and strength at temperatures exceeding 1000°F (537°C). Typically, the carbon content of the plate allows for dual certification.
• Alloy 321 can only be toughened through cold working, not by 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

• Exhibits good general corrosion resistance comparable to 304.
• Developed 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.
• Can be utilized in up to 10% diluted solutions at elevated temperatures.
• Resists polythionic acid stress corrosion cracking in hydrocarbon service.
• Ideal for use in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for use in chloride solutions, even in small concentrations, or in sulfuric acid service.

PROCESSING

Alloy 321/H can be easily welded and processed using standard shop fabrication practices.

HOT FORMING

• Recommended working temperatures for forging, upsetting, and other hot working processes are between 2100 - 2300°F (1149 - 1260°C).
• The alloy is unsuitable for work at temperatures below 1700°F (927°C).
• Material must undergo water quenching or full annealing after working to restore maximum corrosion resistance.

COLD FORMING

• Highly ductile and easily formed.

WELDING

• Readily welded by most standard processes.
• Post-weld heat treatment is unnecessary.

MACHINING

• The hardening rate of 321 makes it less machinable than 410 stainless steel but comparable 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 - Experience unparalleled speed in acquiring high-quality 321/321H Stainless Steel Pipes and Tubes. We pride ourselves on delivering prompt and efficient services to our valued clients.
• Customized Sizes: Whether you need standard or bespoke dimensions, we can expertly process 321/321H Stainless Steel Tubes to meet your exact specifications seamlessly.
• Best Prices: Our competitively priced 321/321H Stainless Steel Pipes ensure you receive exceptional value without compromising on quality.
  Quality Products: We are committed to maintaining the highest quality standards for our SS 321/321H Pipes and Tubes, ensuring unparalleled reliability and performance.
  Full Certifications: Our products are backed by comprehensive certifications, including Mill TC, Test Reports, and Hydrostatic Tests from NABL approved laboratories.
• Fittings and Flanges: As a manufacturer of 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, we offer the convenience of a one-stop solution for all your fitting needs.

Features it possesses

• Made from pure stainless steel alloy, SS321/SS321H welded pipes boast incredible durability, flexibility, and toughness. They offer high tensile strength, dimensional accuracy, and a polished surface finish. Additionally, they excel in resisting pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion, ensuring a long service life.

Testing

• We conduct extensive tests including positive material identification, intergranular corrosion, pitting resistance, mechanical, chemical, macro/micro, and flattening/flaring tests to ensure the highest quality.

Documents provided-

• We provide essential documentation such as heart treatment charts, quality assurance plans, commercial invoices, certificates of origin, raw material test reports, and material traceability reports. Additional documents include MTC as per EN 10204/3.1B, radiography test reports, and third-party test reports for complete transparency and assurance.