ASTM A312 / A358 Stainless Steel 321 Pipe Supplier; 321 / 321H Stainless Steel Seamless Pipe. Contact us for ASME SA312 321 Stainless Steel Pipe for unbeatable quality and reliability.

Type 321 stainless steel, an advanced austenitic alloy, mirrors the properties of Type 304 but excels with its enhanced titanium and carbon content. This unique composition endows it with unparalleled corrosion and oxidation resistance, even under cryogenic conditions. Titanium in 321 stainless steel plays a pivotal role by: Preventing harmful carbide precipitation in the heat affected zone (HAZ) of the weld. Offering partial protection against intergranular corrosion. Reducing embrittlement in high-risk weld areas. 321H stainless steel is indispensable for applications subject to high temperatures (800°F-1500°F) and corrosive environments. While 321 stainless steel shares similarities with 304, its higher nickel and titanium stabilization prevent the formation of chromium carbides at the grain boundaries. This preservation fortifies its corrosion resistance during exposure to critical temperatures. The grade responds excellently to cold working, is effortlessly weldable, and maintains its stellar performance in various corrosive scenarios, often without requiring post-weld annealing.

Chemical composition of 321 stainless steel pipe

Premier Stainless Steel Tube and Pipe Suppliers in China

GENERAL PROPERTIES

• 321 Stainless Steel Pipe (UNS S32100) is a titanium-stabilized, austenitic stainless steel with superior overall corrosion resistance. It exhibits high resistance to intergranular corrosion after exposure to chromium carbide precipitation temperatures (800 - 1500°F / 427 - 816°C). The alloy can withstand oxidation up to 1500°F (816°C) and offers enhanced creep and stress rupture properties compared to 304 and 304L steel pipes. Additionally, it boasts commendable low-temperature toughness.
• Stainless Steel Tube 321H (UNS S32109) is a higher carbon version of this alloy (0.04 - 0.10), designed for increased creep resistance and strength at temperatures above 1000°F (537°C). Typically, the carbon content allows for dual certification.
• Alloy 321 can be toughened solely through cold working, 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 in the chromium carbide precipitation range of 1800 - 1500°F (427 - 816°C).
• Applicable in most diluted organic acids at moderate temperatures.
• Suitable for pure phosphoric acid at lower temperatures.
• Can be used in up to 10% diluted solutions at elevated temperatures.
• Resists polythionic acid stress corrosion cracking in hydrocarbon service.
• Effective in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not suitable for chloride solutions, even in small concentrations, or sulfuric acid service.

PROCESSING

Alloy 321/H can be welded and processed easily with 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 below temperatures of 1700°F (927°C).
• Material must be water quenched or fully annealed post-working to regain maximum corrosion resistance.

COLD FORMING

• Highly ductile and easy to form.

WELDING

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

MACHINING

• 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: Experience the fastest turnaround with our premium 321/321H Stainless Steel Pipes and Tubes, ensuring high-quality service delivery to our esteemed clients.
• Customized Sizes: Tailored to your needs, we expertly process Stainless Steel 321/321H Tubes to produce and supply both standard and non-standard stainless steel pipes with precision.
• Best Prices: Discover unbeatable value with our competitively priced 321/321H Stainless Steel Pipes, offering premium quality at an affordable cost.
  Quality Products: Our unwavering commitment to excellence guarantees superior quality in every SS 321/321H Pipe and Tube we provide.
  Full Certifications: Confidence in every purchase-our products are fully certified with Mill TC, Test Reports, and Hydrostatic Tests from NABL-approved labs.
• 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 shop for all your needs.

Key Features

• Our SS321/SS321H stainless steel welded pipes, crafted from pure stainless steel alloy, boast remarkable properties such as exceptional durability, flexibility, toughness, and long service life. With high tensile strength, dimensional accuracy, and a refined surface finish, these pipes excel in resisting pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion.

Comprehensive Testing

• Our rigorous testing protocol includes positive material identification, intergranular corrosion, pitting resistance, mechanical, chemical, macro/micro, and flattening/flaring tests to ensure unmatched quality.

Provided Documentation

• We equip buyers with essential documents including the heat treatment chart, quality assurance plan, commercial invoice, certificate of origin, raw material test report, and material traceability report. Additionally, we provide MTC as per EN 10204/3.1B, radiography test reports, and third-party test reports for comprehensive transparency.