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321 Stainless Steel Pipes and Tubes

Grades 321 are the basic Austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) additions

321 Stainless Pipe and Tube

TP321 · UNS S32100 · 18Cr-8Ni titanium-stabilised


stainless steel Pipes

Savoy Piping Inc. supplies 321 — Ti-stabilised austenitic for intermittent high temperature and resistance to chromium carbide sensitization.

Grade hub · A312 Seamless · A312 Welded · A213 · A269 · A358 EFW · SS hub

Also see: Stainless steel pipe & tube hub · Buttweld fittings · Flanges · Materials hub.

What is 321?

321 (UNS S32100): 18Cr-8Ni titanium-stabilised. Mechanical guide: per SA-312 TP321 — confirm PO.

Typical applications

  • Aircraft / exhaust and high-temp process lines
  • Refinery polythionic acid SCC mitigation packages (as specified)
  • Heat-exchanger and furnace-adjacent piping

Selection guidance

Specify 321 when stabilisation is required. For welded heavy sections at lower temp, 304L may still be preferred — follow the engineer.

321 vs 347: Ti vs Nb stabilisation. 321 vs 321H: carbon window for creep.

321 Stainless Steel Pipe and Tubes range

321 Stainless Steel Pipe & Tubes Specification ASTM A269, ASTM A213, ASTM A312, ASME SA269, ASME SA213, ASME SA312
321 Stainless Steel Pipe & Tubes Grades 202, 304, 304L, 304H, 304LN, 309S, 310S, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, SMO 254, ALLOY 254, 6MO, 6MOLY, UNS S31254 ETC.
321 Stainless Steel Pipe & Tubes Type Seamless Tube / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish
321 Stainless Steel Pipe & Tubes Outer Diameter Size Seamless Pipe - 1/2" NB TO 18" NB
Welded Pipes / ERW- 1" NB TO 16" NB
EFW - 8" NB TO 110" NB
321 Stainless Steel Pipe & Tubes Wall Thickness Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness)
321 Stainless Steel Pipe & Tubes Length 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size.
321 Stainless Steel Pipe & Tubes Ends Plain Ends / Beveled Ends
321 Stainless Steel Pipe & Tubes Delivery Conditions As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw
321 Stainless Steel Pipe & Tubes Coating Electropolish, Mechanical Polish, Satin Finish, Passivate
321 Stainless Steel Pipe & Tubes Other Testing Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc
321 Stainless Steel Pipe & Tubes Dimension All Pipes Tube Is Manufactured and Inspected / Tested to the Relevant standards includingASTM And ASME
321 Stainless Steel Pipe & Tubes Value Added Services Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment
321 Stainless Steel Pipe & Tubes Packaging Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector
321 Stainless Steel Pipe & Tubes Shipment & Transportation By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 4 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes
321 Stainless Steel Pipe & Tubes Material Test Certificate Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC

Chemical Composition of 321 Stainless Steel Pipes and Tubes

The Chemical Composition of grade 321 Stainless Steel Tube is outlined in the following tableTypical compositional ranges for grade 321 stainless steels Pipes

Grade C Mn Si P S Cr Mo Ni N Other
321 min.
max		 -
0.08		 2.00 1.00 0.045 0.030 17.0
19.0		 - 9.0
12.0		 0.10 Ti=5(C+N)
0.70
321H min.
max		 0.04
0.10		 2.00 1.00 0.045 0.030 17.0
19.0		 - 9.0
12.0		 - Ti=4(C+N)
0.70

Mechanical Properties of 321 Stainless Steel Pipes and Tubes

The Mechanical Properties of grade 321 Stainless Steel and Steel Alloyare displayed in the following table.

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
321 515 205 40 95 217
321H 515 205 40 95 217
321H also has a requirement for a grain size of ASTM No 7 or coarser.

321 Stainless Steel Pipes and Tubes Physical Properties

Physical properties of 321 grade stainless steel in the annealed condition

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nΩ.m)
0-100°C 0-315°C 0-538°C at 100°C at 500°C
321 8027 193 16.6 17.2 18.6 16.1 22.2 500 720

grade Specification Comparison for 321 Stainless Steel Pipes and Tubes

Grade Specifications for 321 grade stainless steel

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
321 S32100 321S31 58B, 58C 1.441 X6CrNiTi18-10 2337 SUS 321
321H S32109 321S51 - 1.4878 X10CrNiTi18-10 - SUS 321H
347 S34700 347S31 58G 1.450 X6CrNiNb18-10 2338 SUS 347
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

321 Stainless Steel Pipes and Tubes Applications

The grade 321 steel and Corten Steel can be made into plates, sheets, and coils to be used in the following:

  • Food preparation equipment particularly in chloride environments.
  • Laboratory benches & equipment.
  • Coastal architectural panelling, railings & trim.
  • Boat fittings.
  • Chemical containers, including for transport.
  • Heat Exchangers.
  • Woven or welded screens for mining, quarrying & water filtration.
  • Threaded fasteners.
  • Springs.

Frequently asked questions — 321 Pipe & Tube

What is 321?

321 (UNS S32100) is Ti-stabilised austenitic for intermittent high temperature and resistance to chromium carbide sensitization. Chemistry: 18Cr-8Ni titanium-stabilised.

Which product specs?

Pipe A312 / A358 EFW; tube A213 / A269 (and A249 welded where specified).

Typical strength?

per SA-312 TP321 — confirm PO

Related grades?

321 vs 347: Ti vs Nb stabilisation. 321 vs 321H: carbon window for creep.

Supplying 321 Stainless Steel Pipes and Tubes to Countries -

We export 321 Stainless Steel Pipes and Tubes to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, Israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Myanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States of America, Canada, Mexico, Panama, Costa Rica, Puerto Rico, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherlands, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East.etc

Savoy Piping Inc. is a well known worldwide Exporter of 321 Stainless Steel Pipes and Tubes is committed to provide each and every customer with the highest standard of customer service. We deal in 321 Stainless Steel Pipes and Tube in India and Overseas, offering a wide range of 321 Stainless Steel Pipes and Tubes