ASTM A312 / A358 Stainless Steel 321 Pipe Supplier; 321 / 321H Stainless Steel Seamless Pipe. Reach out to us for ASME SA312 321 Stainless Steel Pipe inquiries.

Type 321 stainless steel is an austenitic steel, renowned for its superior corrosion and oxidation resistance, and exceptional toughness even at cryogenic temperatures. Enhanced with titanium and carbon, it excels where Type 304 cannot. Key Benefits: - Titanium prevents harmful carbide precipitation in the heat-affected zones (HAZ) of welds. - Offers partial protection against intergranular corrosion. - Reduces embrittlement in high-risk weld areas. 321H variant is ideal for parts exposed to carbide precipitation temperatures (800°F-1500°F) and corrosive environments. Distinct from 304 stainless steel due to its higher nickel content and titanium stabilization. Titanium's interaction with carbon prevents chromium carbides at grain boundaries, maintaining corrosion resistance. Easily weldable and rarely needing post-weld annealing, 321 stainless steel thrives under various corrosive conditions and hardens well with cold working.

Chemical Composition of 321 Stainless Steel Pipe

Leading Stainless Steel Tube and Pipe Suppliers in China

General Properties

• 321 Stainless Steel Pipe (UNS S32100) is a titanium-stabilized austenitic stainless steel offering excellent overall corrosion resistance. It provides high resistance to intergranular corrosion after exposure to chromium carbide precipitation temperatures of 800 - 1500°F (427 - 816°C). The alloy resists oxidation up to 1500°F (816°C) and boasts superior creep and stress rupture properties compared to 304 and 304L steel pipes, along with excellent low temperature toughness.
• Stainless Steel Tube 321H (UNS S 32109) features a higher carbon content (0.04 - 0.10), designed to enhance creep resistance and strength at temperatures exceeding 1000°F (537°C). Often, the carbon content enables dual certification of the plate.
• Alloy 321 can only be strengthened through 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

• 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.
• Can be used in pure phosphoric acid at lower temperatures.
• Effective in up to 10% diluted solutions at elevated temperatures.
• Resists polythionic acid stress corrosion cracking in hydrocarbon service.
• Used in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for use in chloride solutions or sulfuric acid service, even in small concentrations.

Processing

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

Hot Forming

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

Cold Forming

• Highly ductile and easily forms.

Welding

• Readily weldable by most standard processes.
• Post-weld heat treatment is not required.

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 stainless steel pipes and tubes manufactured by Daxun?

• Short Lead Time - Experience the swiftest delivery of premium 321/321H Stainless Steel Pipes and Tubes, ensuring your projects stay on schedule without compromising quality.
• Customized Sizes: Whether you require standard or bespoke Stainless Steel 321/321H Tubes, our advanced processing capabilities guarantee precision to meet your specific needs.
• Best Prices: Our 321/321H Stainless Steel Pipes offer exceptional value, combining top-tier quality with highly competitive pricing.
  Quality Products: We are committed to maintaining the highest standards, ensuring that every SS 321/321H Pipe and Tube meets rigorous quality benchmarks.
  Full Certifications: Our products are accompanied by comprehensive certifications, including Mill TC, Test Reports, and NABL-approved Hydrostatic Tests, providing full assurance of quality and compliance.
• Fittings and Flanges: As your one-stop solution, we manufacture 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, catering to all your piping needs under one roof.

Features it possesses

• Our SS321/SS321H stainless steel welded pipes, crafted from pure stainless steel alloy, boast remarkable properties including durability, flexibility, toughness, extended service life, high tensile strength, precise dimensional accuracy, and a superior surface finish. They also offer enhanced resistance to pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion, making them an optimal choice for demanding environments.

Testing

• Our rigorous testing protocol includes Positive Material Identification, Intergranular Corrosion, Pitting Resistance, Mechanical, Chemical, Macro/Micro, and Flattening/Flaring tests, ensuring unmatched reliability and performance.

Documents provided-

• We supply a comprehensive suite of documentation including heat treatment charts, quality assurance plans, commercial invoices, certificates of origin, raw material test reports, and material traceability reports. Additionally, we provide MTC as per EN 10204/3.1B, radiography test reports, and third-party test reports to ensure full transparency and compliance.