Premium ASTM A312 / A358 Stainless Steel 321 Pipe Supplier; Offering 321 / 321H Stainless Steel Seamless Pipes. Reach out to us for high-quality ASME SA312 321 Stainless Steel Pipes.

Type 321 stainless steel is a top-tier austenitic alloy. It shares the robust properties of Type 304, enhanced with added titanium and carbon. Type 321 offers fabricators unparalleled corrosion and oxidation resistance, along with remarkable toughness even at cryogenic extremes. Its resilience to oxidation and corrosion is exceptional. Titanium in 321 stainless steel imparts numerous advantageous traits: Prevents harmful carbide precipitation in the weld heat-affected zone (HAZ). Provides partial protection against intergranular corrosion. Mitigates embrittlement in high-risk weld areas. 321H stainless steel is ideal for applications where components are exposed to carbide precipitation temperatures (800°F-1500°F) and corrosive environments. Type 321 mirrors 304 stainless steel but boasts higher nickel content and titanium stabilization. Titanium bonds with carbon, averting chromium carbide formation at grain boundaries, thereby preserving corrosion resistance by minimizing chromium depletion near the grain borders during critical temperature exposure. This grade hardens effectively with cold working, is easily weldable, and seldom requires post-weld annealing, ensuring superior performance in diverse corrosive conditions.

Chemical Composition of 321 Stainless Steel Pipe

Pioneering Stainless Steel Tube and Pipe Suppliers in China

GENERAL PROPERTIES

• 321 Stainless Steel Pipe (UNS S32100) is a titanium-stabilized austenitic stainless steel known for its superior corrosion resistance. It offers exceptional resistance to intergranular corrosion after exposure to chromium carbide precipitation temperatures between 800 - 1500°F (427 - 816°C). The alloy can withstand oxidation up to 1500°F (816°C) and exhibits better creep and stress rupture properties compared to 304 and 304L steel pipes. Additionally, it maintains good low-temperature toughness.
• Stainless Steel Tube 321H (UNS S 32109) is the higher carbon variant (0.04 - 0.10) of this alloy, designed to enhance creep resistance and strength at temperatures exceeding 1000°F (537°C). Typically, the carbon content ensures dual certification.
• Alloy 321 achieves toughness exclusively through cold working and not via heat treatment. It is easily weldable and can be processed using standard shop fabrication techniques.

COMMON APPLICATIONS

• Aerospace - Piston Engine Manifolds
• Chemical Processing Equipment
• Expansion Joints
• Food Processing Equipment and Storage
• Petroleum Refining - Polythionic Acid Service
• Waste Treatment Systems - Thermal Oxidizers

ASTM/ASTE : UNS S32100

CORROSION RESISTANCE

• demonstrates excellent general corrosion resistance, comparable to 304.
• engineered for use within the chromium carbide precipitation range of 427 - 816°C (800 - 1500°F).
• suitable for use in most diluted organic acids at moderate temperatures.
• effective in pure phosphoric acid at lower temperatures.
• can be applied in up to 10% diluted solutions at elevated temperatures.
• resistant to polythionic acid stress corrosion cracking in hydrocarbon services.
• functional in chloride or fluoride-free caustic solutions at moderate temperatures.
• not advisable for use in chloride solutions, even in minimal concentrations, or in sulfuric acid environments.

PROCESSING

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

HOT FORMING

• For forging, upsetting, and other hot working processes, recommended working temperatures are between 2100 - 2300°F (1149 - 1260°C).
• The alloy is unsuitable for work at temperatures below 1700°F (927°C).
• Material must be water-quenched or fully annealed post-working to regain maximum corrosion resistance.

COLD FORMING

• Highly ductile and easily formable.

WELDING

• Easily weldable by most standard processes.
• Post-weld heat treatment is typically unnecessary.

MACHINING

• Due to its hardening rate, 321 is 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 stainless steel pipes and tubes manufactured by Daxun?

• Short Lead Time - Experience unparalleled efficiency with Jiangsu Daxun Alloy Co., Ltd., where we pride ourselves on delivering top-tier 321/321H Stainless Steel Pipes and Tubes promptly to our esteemed clients.
• Customized Sizes: Tailor-made solutions are our specialty. We expertly process Stainless Steel 321/321H Tubes to supply both standard and non-standard stainless steel pipes, meeting your precise specifications.
• Best Prices: Enjoy unbeatable value with our competitively priced 321/321H Stainless Steel Pipes, ensuring you receive premium quality without the premium cost.
  Quality Products: We are unwavering in our commitment to excellence, guaranteeing the superior quality of our SS 321/321H Pipes and Tubes at every step.
  Full Certifications: Confidence in every purchase. Our products are accompanied by comprehensive certifications including Mill TC, Test Reports, and Hydrostatic Tests from NABL approved laboratories.
• Fittings and Flanges: Simplify your procurement process with Jiangsu Daxun Alloy Co., Ltd. We manufacture 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, offering a one-stop solution for all your needs.

Features it possesses

• Crafted from pure stainless steel alloy, our SS321/SS321H stainless steel welded pipes boast a myriad of exceptional properties including outstanding durability, flexibility, toughness, high tensile strength, and dimensional accuracy. They feature an excellent surface finish and exhibit formidable resistance to pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion, ensuring long-lasting performance.

Testing

• We conduct a comprehensive range of tests including positive material identification, intergranular corrosion, pitting resistance, mechanical, chemical, macro/micro examination, and flattening/flaring tests to ensure unparalleled quality.

Documents provided-

• A suite of essential documents accompanies our products, including a heat treatment chart, quality assurance plan, commercial invoice, certificate of origin, raw material test report, and material traceability report. Additionally, buyers receive MTC as per EN 10204/3.1B, radiography test reports, and third-party test reports for complete transparency and assurance.