Your Premier ASTM A312 / A358 Stainless Steel 321 Pipe Supplier. Discover our 321 / 321H Stainless Steel Seamless Pipe. Reach out to us for the impeccable ASME SA312 321 Stainless Steel Pipe.

Type 321 stainless steel, an austenitic variant, offers metal fabricators an edge with its superior corrosion and oxidation resistance. Strengthened with increased titanium and carbon content compared to Type 304, 321 stainless steel ensures exceptional toughness, even at cryogenic temperatures. Its remarkable resistance to oxidation and corrosion is further enhanced by titanium, offering various advantages: It prevents harmful carbide precipitation in the heat-affected zones (HAZ) of welds, protects against intergranular corrosion, and reduces embrittlement in high-risk weld areas. Commonly used in applications exposed to carbide precipitation temperatures (800°F-1500°F) and corrosive atmospheres, 321 stainless steel maintains its integrity under these conditions. The addition of titanium interacts preferentially with carbon, preventing chromium carbide formation at grain boundaries, thereby preserving its corrosion-resistant qualities. This grade hardens effectively with cold working, is easily weldable, and rarely requires post-weld annealing, ensuring outstanding performance across various corrosive environments.

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 offering excellent overall corrosion resistance. It stands out with high resistance to intergranular corrosion after exposure to the chromium carbide precipitation temperature range 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. Additionally, it demonstrates good low-temperature toughness.
• The Stainless Steel Tube 321H (UNS S 32109) variant includes a higher carbon content (0.04 - 0.10), which enhances its creep resistance and strength at temperatures above 1000°F (537°C). Often, its carbon content allows for dual certification.
• Alloy 321 is only hardenable through cold working and not by heat treatment. It can be effortlessly 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 excellent general corrosion resistance comparable to 304.
• Engineered for use within the chromium carbide precipitation range of 1800 - 1500°F (427 - 816°C).
• Suitable for use in most diluted organic acids at moderate temperatures.
• Applicable in pure phosphoric acid at lower temperatures.
• Functional in up to 10% diluted solutions at elevated temperatures.
• Resistant to polythionic acid stress corrosion cracking in hydrocarbon service.
• Effective in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for use in chloride solutions, even at low concentrations, or in sulfuric acid service.

PROCESSING

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

HOT FORMING

• For optimal results, maintain working temperatures between 2100 - 2300°F (1149 - 1260°C) during forging, upsetting, and other hot working processes.
• The alloy is unsuitable for work at temperatures below 1700°F (927°C).
• After working, the material must be water quenched or fully annealed to restore maximum corrosion resistance.

COLD FORMING

• Highly ductile and forms effortlessly.

WELDING

• Easily welded using most standard processes.
• Post-weld heat treatment is unnecessary.

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 stainless steel pipes and tubes manufactured by Daxun?

• Short Lead Time - We pride ourselves on delivering top-tier 321/321H Stainless Steel Pipes and Tubes with unparalleled speed, ensuring our clients receive outstanding service as swiftly as possible.
• Customized Sizes: At Jiangsu Daxun Alloy Co., Ltd., we expertly process Stainless Steel 321/321H Tubes to meet both standard and custom specifications, catering to a wide range of stainless steel pipe requirements.
• Best Prices: Our competitively priced 321/321H Stainless Steel Pipes offer exceptional value, making high-quality stainless steel accessible without compromising affordability.
  Quality Products: We are committed to maintaining the highest standards in our SS 321/321H Pipes and Tubes, ensuring superior quality at every production stage.
  Full Certifications: Our products are backed by comprehensive certifications, including Mill TC, Test Reports, and Hydrostatic Tests from NABL-approved laboratories, guaranteeing reliability and trust.
• Fittings and Flanges: As a leading manufacturer, we offer a complete range of 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, providing the convenience of sourcing all your needs from a single, trusted vendor.

Features it possesses

• Crafted from pure stainless steel alloy, our SS321/SS321H stainless steel welded pipe boasts exceptional properties such as durability, flexibility, toughness, and high tensile strength. It also features long service life, high dimensional accuracy, and a superb surface finish. Additionally, it offers superior resistance to pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion.

Testing

• Our rigorous testing includes Positive Material Identification, Intergranular Corrosion Test, Pitting Resistance Test, Mechanical Test, Chemical Test, Macro/Micro Analysis, and Flattening/Flaring Test, ensuring the highest quality and reliability.

Documents provided

• Essential documents provided include the Heat Treatment Chart, Quality Assurance Plan, Commercial Invoice, Certificate of Origin, Raw Material Test Report, and Material Traceability Report. In addition, buyers receive MTC as per EN 10204/3.1B, Radiography Test Report, and Third-Party Test Reports, ensuring full transparency and compliance.