• Address : A1010, No.581 Xiuchuan road, Pudong new area, Shanghai  201299, China

Haosteel is professional manufacturer and supplier of 321 Stainless Steel Square Pipe. Quality guaranteed, On-time delivery, After-sales warranty.

Standard: ASTM A269/A312/A213/A249/A554
Delivery:Cold rolled Hot rolled
Surface:Mill, Pickled, HL, Polished, Mirror
Thickness:0.2mm - 30mm
Outer Diameter10*10-1000*1000mm
Length:  6000mm or as customer request
Mill:Tisco, Jisco, Baosteel, etc.
Delivery time:15 days in common



Type 321 is an austenitic chromium-nickel stainless steel containing Titanium which is recommended for parts fabricated by welding which cannot subsequently be annealed.Type 321 is a stabilized austenitic stainless steel similar to type 304 but with a titanium addition . This titanium addition reduces or prevents carbide precipitation during welding and in 800 – 1500°F (427 – 816°C) service. It also improves the elevated temperature properties of the alloy. Type 321 provides excellent resistance to oxidation and corrosion and possesses good creep strength.


Chemical composition:

≤ 0.08≤ 0.75≤ 2.0≤ 0.045≤ 0.0317.0 - 19.09.0 - 12.05(C=N)~0.7


Physical Properties:

Ultimate Tensile Strength – 75KSI min (515 MPA min)
Yield Strength (0.2% Offset) –30 KSI min (205 MPA min)
Elongation – 40% min
Hardness – HRB95max (217HV max) 



Aircraft collector rings, exhaust stacks, carburetor air intensifier tubes, exhaust manifolds, flexible couplings, jet engine parts, mufflers, pressure vessels, tubing, fasteners, flexible metal hose and bellows.


Heat Treatment:

Type 321 is non hardenable by heat treatment. It can only be hardened by cold working.


Cold Forming:
321 can be readily formed and drawn. Like most other austenitic stainless steels, type 321 work hardens and may require annealing after severe forming.

Corrosion Resistance:
321 has excellent corrosion resistance equivalent to type 302 or 304 in the annealed condition and superior if a weldment in these grades has not been post-weld annealed or if the application involves service in the 800°F – 1600°F range.

321 Stainless Steel Square Pipe