ASTM A312 / A358 Stainless Steel 321 Pipe Supplier; 321 / 321H Stainless Steel Seamless Pipe. Contact us for premium ASME SA312 321 Stainless Steel Pipe.

Type 321 stainless steel is an advanced austenitic steel that shares many of the desirable properties of Type 304, yet boasts increased titanium and carbon content. This enhancement equips Type 321 with superior corrosion and oxidation resistance, as well as remarkable toughness, even at cryogenic temperatures. With its high resistance to oxidation and corrosion, Type 321 stands out in demanding environments. The addition of titanium provides several notable advantages: it prevents harmful carbide precipitation in the heat-affected zone (HAZ) of the weld, offers partial protection against intergranular corrosion, and reduces embrittlement in high-risk welding areas. Type 321H stainless steel excels in applications where components are heated to carbide precipitation temperatures (800°F-1500°F) and exposed to corrosive atmospheres. While similar to 304 stainless steel, Type 321 contains more nickel and is stabilized with titanium, which preferentially interacts with carbon to prevent the formation of chromium carbides at the grain boundaries. This ensures corrosion resistance by minimizing chromium consumption near grain borders during critical temperature exposure. Type 321 stainless steel hardens efficiently with cold working, is easily weldable, and rarely requires post-weld annealing, maintaining its outstanding performance in various corrosive conditions.

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 known for its exceptional corrosion resistance. This steel excels in resisting intergranular corrosion after exposure to the chromium carbide precipitation temperature range of 800 - 1500°F (427 - 816°C). It withstands oxidation up to 1500°F (816°C) and boasts superior creep and stress rupture properties compared to 304 and 304L steel pipes. Additionally, it maintains excellent toughness even at low temperatures.
• Stainless Steel Tube 321H (UNS S 32109) is a higher carbon version of this alloy (0.04 - 0.10), designed to enhance creep resistance and strength at temperatures exceeding 1000oF (537°C). The carbon content typically allows for dual certification.
• Alloy 321 can be toughened exclusively 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 excellent 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.
• Compatible with pure phosphoric acid at lower temperatures.
• Effective in up to 10% diluted solutions at elevated temperatures.
• Resists polythionic acid stress corrosion cracking in hydrocarbon services.
• Utilized in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for chloride solutions, even in small concentrations, or 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 2100 - 2300°F (1149 - 1260°C).
• Not suitable for work at temperatures below 1700°F (927°C).
• Must be water quenched or fully annealed after working to regain maximum corrosion resistance.

Cold Forming

• Quite ductile and easily formed.

Welding

• Readily 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 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 - We pride ourselves on delivering top-notch 321/321H Stainless Steel Pipes and Tubes with unmatched speed, ensuring our clients receive the best services in the shortest time possible.
• Customized Sizes: Tailored to perfection, we process Stainless Steel 321/321H Tubes to meet both standard and unique specifications, offering unparalleled flexibility in stainless steel pipe dimensions.
• Best Prices: Our 321/321H Stainless Steel Pipes are offered at the most competitive prices, providing unbeatable value for superior quality.
  Quality Products: We are unwavering in our commitment to quality, ensuring that every SS 321/321H Pipe and Tube meets the highest standards of excellence.
  Full Certifications: Our products are backed by comprehensive certifications, including Mill TC, Test Reports, and Hydrostatic Tests from NABL-approved labs, guaranteeing peace of mind.
• Fittings and Flanges: As a premier manufacturer, we supply a complete range of 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, simplifying procurement by offering a one-stop solution.

Features it possesses

• Crafted from pure stainless steel alloy, SS321/SS321H stainless steel welded pipes boast a range of remarkable properties. These include exceptional durability, flexibility, strength, long service life, high tensile strength, precise dimensions, and a smooth surface finish. Moreover, they offer enhanced resistance to pitting, general corrosion, oxidation, stress corrosion cracking, and crevice corrosion.

Testing

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

Documents provided-

• We supply essential documents such as the 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, ensuring full transparency and traceability.