Stainless Steel Seamless Pipes

Stainless Steel 321 Pipes

ASTM A312 · Seamless, ERW and welded

Stainless Steel 321 Pipes

Stainless Steel 321 Pipes in seamless, ERW and welded to ASTM A312. Compare quotes from verified suppliers on MetalMitra, with MTC 3.1 and worldwide delivery.

  • Stainless Steel 321 Pipes
  • SS 321
  • Seamless
  • ERW
  • Welded
  • EFW
  • LSAW
  • Titanium Stabilized
  • High Temperature

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Specifications

Material GradeStainless Steel 321
SpecificationsASTM A213 / ASME SA213, ASTM A249, ASTM A269, ASTM A312 / ASME SA312, ASTM A358 Class I to V, ASTM A789 / ASTM A790
DimensionsASTM, ASME and API
General Size1/8" NB to 30" NB
321 Pipes & Tubes1/2" NB – 24" NB
ERW 321 Pipes & Tubes1/2" NB – 24" NB
EFW 321 Pipes & Tubes6" NB – 100" NB
Specialized InLarge Diameter Sizes
Thickness / SchedulesSCH20, SCH30, SCH40, STD, SCH60, SCH80, XS, SCH120, SCH140, SCH160, XXS
TypeSeamless / ERW / Welded / Fabricated / LSAW Pipes
FormRound, Square, Rectangular, Hydraulic
LengthSingle Random, Double Random & Cut Length
EndsPlain End, Beveled End, Threaded End

Grades & standards

  • ASTM A312
  • ASTM A213
  • ASTM A269
  • ASTM A249
  • ASTM A358
  • ASTM A790
  • ASTM A789

Chemical composition & mechanical properties

Stainless Steel 321 — Chemical composition, %
CMnPSSiCrNiTiN
0.082.000.0450.0300.7517.0–19.09.0–12.05×(C+N) – 0.700.10
Stainless Steel 321 — Mechanical properties
Tensile strength, min515 MPa
Yield strength (0.2%), min205 MPa
Elongation in 50 mm, min40%
Hardness, max217 HBW

Single values are maximums unless marked min. Values per ASTM A240 (plate, sheet and strip); always confirm against the purchase specification and the mill test certificate.

Need a dependable stainless steel piping? Stainless Steel 321 Pipes on MetalMitra come in seamless, ERW and welded to ASTM A312, ready for process, pressure and heat-transfer lines.

Titanium-stabilized stainless steel 321 pipes and tubes designed for demanding industrial applications requiring corrosion resistance, elevated-temperature performance and reliable long-term service.

Stainless Steel 321 is a titanium-stabilized austenitic stainless steel grade developed for applications where resistance to intergranular corrosion and elevated-temperature service are important considerations. Titanium stabilization helps reduce the risk of sensitization during suitable high-temperature exposure.

SS 321 Pipes & Tubes are widely used in chemical processing, petrochemical plants, power generation, aerospace-related applications, exhaust systems, heat exchangers, refineries, marine systems and general industrial engineering.

Available forms & variants

  • SS 321 Seamless Pipes — High-integrity seamless pipes for demanding process applications.
  • SS 321 ERW Pipes — Welded pipe configurations for industrial piping systems.
  • SS 321 Welded Pipes — Available in various sizes and wall thicknesses.
  • SS 321 EFW Pipes — Large-diameter pipe solutions for industrial projects.
  • SS 321 LSAW Pipes — Large-diameter longitudinally welded pipe configurations.
  • SS 321 Tubes — Round, square, rectangular and hydraulic tube configurations.

Performance highlights

  • Titanium Stabilized — Stabilized stainless steel grade designed for demanding service conditions.
  • High-Temperature Performance — Suitable for selected applications involving elevated temperatures.
  • Corrosion Resistance — Provides reliable resistance across many industrial environments.
  • Excellent Fabrication — Suitable for industrial forming, fabrication and welding applications.

Typical applications

  • Chemical Processing
  • Oil & Gas
  • Petrochemical
  • Refineries
  • Power Generation
  • Heat Exchangers
  • Aerospace Applications
  • Marine Industry
  • Pharmaceutical
  • Food Processing
  • Fertilizer Plants
  • Nuclear Applications
  • Exhaust Systems
  • Process Equipment

Quality checks & certification

Every lot of Stainless Steel 321 Pipes sourced through MetalMitra can be inspected and documented to the governing standard and your purchase order.

  • Dimensional & Visual Inspection
  • Material Grade Verification
  • Chemical Composition Verification
  • Mechanical Property Testing
  • Titanium Stabilization Verification as Applicable
  • Non-Destructive Testing as Applicable
  • Hydrostatic / Pressure Testing as Applicable
  • Intergranular Corrosion Testing as Applicable
  • EN 10204 3.1 Mill Test Certificate
  • Customer-Specific Inspection Documentation

Why buy through MetalMitra

  • Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
  • One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
  • Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
  • Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.

Ready to buy?

Send your size, grade, quantity and delivery location for Stainless Steel 321 Pipes, and matching suppliers on MetalMitra will come back with offers.

Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.

Applications & industries

  • Chemical Processing
  • Oil & Gas
  • Petrochemical
  • Refineries
  • Power Generation
  • Heat Exchangers
  • Aerospace Applications
  • Marine Industry
  • Pharmaceutical
  • Food Processing
  • Fertilizer Plants
  • Nuclear Applications
  • Exhaust Systems
  • Process Equipment
  • Oil & Gas
  • Petrochemical & Refining
  • Power Generation
  • Chemical Processing
  • Marine & Shipbuilding
  • Pharmaceutical
  • Food & Dairy
  • Fertiliser
  • Aerospace

Testing & documents

Ask for the documents you need in your requirement — suppliers confirm them in their quotation:

  • Mill test certificate to EN 10204 3.1, or 3.2 with third-party witness
  • Third-party inspection (TPI) by SGS, Bureau Veritas, TÜV or your nominated agency
  • Tests as the standard or your order requires: hydro, PMI, IGC, NDT, hardness or impact tests

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