ASTM A312 / A358 Stainless Steel 321 Pipe Supplier; Explore our 321 / 321H Stainless Steel Seamless Pipes. Contact us for premium-grade ASME SA312 321 Stainless Steel Pipes.

Type 321 stainless steel is an advanced austenitic steel, boasting similarities to Type 304, but enhanced with higher titanium and carbon content. This ensures unparalleled corrosion and oxidation resistance, along with exceptional toughness even in cryogenic conditions. Titanium in 321 stainless steel provides numerous benefits: * Prevents detrimental carbide precipitation in the weld's heat affected zone (HAZ). * Offers partial protection against intergranular corrosion. * Reduces embrittlement in high-stress weld areas. 321H stainless steel excels in applications where parts are heated to carbide precipitation temperatures (800°F-1500°F) and subjected to corrosive environments. Although 321 stainless steel mirrors 304 stainless steel, it contains more nickel and is stabilized with titanium, which interacts preferentially with carbon, preventing chromium carbide formation at grain boundaries. This preserves its corrosion resistance by minimizing chromium consumption near grain borders during critical temperature exposure. This grade hardens well through cold working, is easily weldable, and seldom requires post-weld annealing to maintain its superior 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 that offers exceptional overall corrosion resistance. This high-performance alloy excels in resisting intergranular corrosion after exposure to chromium carbide precipitation temperatures of 800 - 1500°F (427 - 816°C). It can withstand oxidation up to 1500°F (816°C) and demonstrates superior creep and stress rupture properties compared to 304 and 304L steel pipes. Additionally, it maintains excellent low-temperature toughness.
• Stainless Steel Tube 321H (UNS S 32109) is an enhanced carbon content variant of this alloy (0.04 - 0.10), engineered to offer increased creep resistance and strength at temperatures exceeding 1000°F (537°C). In many situations, the carbon content permits dual certification.
• Alloy 321 achieves its toughness exclusively through cold working, not by heat treatment. It can be effortlessly welded and processed using conventional 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 for use 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.
• Usable in chloride or fluoride-free caustic solutions at moderate temperatures.
• Not recommended for chloride solutions, even in small concentrations, or for sulfuric acid service.

PROCESSING

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

HOT FORMING

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

COLD FORMING

• Highly ductile and easy to form.

WELDING

• Easily welded by 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, and WNR 1.4878 stainless steel pipes and tubes manufactured by Daxun?

• Swift Delivery Time - We pride ourselves on our unparalleled speed in delivering top-notch 321/321H Stainless Steel Pipes and Tubes, ensuring our clients receive exceptional services promptly.
• Tailored Sizes: Our expertise allows us to process Stainless Steel 321/321H Tubes to meet both standard and unique specifications, delivering stainless steel pipes that fit your precise needs.
• Unmatched Pricing: Our 321/321H Stainless Steel Pipes are offered at highly competitive rates, providing excellent value without compromising quality.
  Premium Quality: We are committed to maintaining the highest quality standards for our SS 321/321H Pipes and Tubes, ensuring top performance and reliability.
  Comprehensive Certifications: Our products are accompanied by complete certification, including Mill Test Certificates, Test Reports, and Hydrostatic Tests from NABL approved laboratories.
• Complete Fittings and Flanges Solutions: As a manufacturer of 321 Forged Fittings, 321 Butt Weld Fittings, 321 Compression Ferrule Fittings, and 321/321H Flanges, we offer the convenience of procuring all your requirements from a single, trusted source.

Outstanding Features

• Crafted from pure stainless steel alloy, SS321/SS321H welded pipes boast exceptional properties including remarkable durability, flexibility, toughness, extended service life, high tensile strength, precise dimensional accuracy, and excellent surface finish. Additionally, they exhibit superior resistance to pitting, corrosion, oxidation, stress corrosion cracking, and crevice corrosion.

Comprehensive Testing

• We conduct a wide array of tests including Positive Material Identification, Intergranular Corrosion, Pitting Resistance, Mechanical, Chemical, Macro/Micro analysis, Flattening, and Flaring tests to ensure the highest quality.

Provided Documentation-

• We supply essential documents such as Heat Treatment Charts, Quality Assurance Plans, Commercial Invoices, Certificates of Origin, Raw Material Test Reports, Material Traceability Reports, and more. Additionally, other vital documents including MTC as per EN 10204/3.1B, Radiography Test Reports, and Third-party Test Reports are provided.