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SS321

As a modified version of SS304, stainless steel 321 (SS321) is a stabilized austenitic stainless steel with a titanium addition of at least 5 times the carbon content. The titanium addition reduces or prevents the sensitization of carbide precipitation during welding and in services at the temperature range of 425-815°C. It also improves the some of the properties at elevated temperatures. SS321 provides outstanding resistance to oxidation and corrosion and has good creep strength. It is used primarily in oil refinery equipment, pressure vessel piping, radiant superheaters, bellews, and high-temperature heat treatment equipment.

ASTM A312 TP321 seamless pipes, 14" XS PE.

ASTM A312 TP321 seamless pipes, 14″ XS PE.

1. UNS Designation & International Equivalent

TypeUNSJISEN/DINEN/BSEN/NFISOGBGOST
321S32100SUS321X6CrNiTi18-10321S31X6CrNiTi18-10150Cr18Ni10Ti08KH18H10T

2. Product Forms and Standards

Product FormsMaterial Standards
Plates, Sheets & StripsASTM A240
Billets, Bars & RodsASTM A276, A314, A479
Forgings(Flanges & Fittings)ASTM A182, A473.
WiresASTM A313, A580.
Seamless and Welded PipesASTM A312, A358, A813, A814.
Wrought Pipe FittingsASTM A403
*Especially, Metals-Piping supplies SS321 in the grades of ASTM A312 TP321, ASTM A182 F321, ASTM A403 WP321.

3. Physical Properties of SS321

DensityElectrical ResistivityThermal ConductivityMagnetic PermeabilitySpecific HeatMelting Range
g/cm3µΩ·cmW/mKH/m at 200 OerstedskJ/kg/K°C
8.097216.0≤1.020.501371-1399

4. Chemical Composition of SS321

The Chemical Composition of SS321, %
Carbon≤0.08
Manganese≤2.00
Phosphorus≤0.045
Sulfur≤0.030
Silicon≤0.75
Chromium17.00-19.00
Nickel9.00-12.00
Titanium≤0.70
Nitrogen≤0.10
IronBalance

5. Mechanical Properties of SS321

Tensile Strength,min.Yield Strength, min.ElongationHardness
ksi(Mpa)ksi(Mpa)%
85(586)35(241)55B70

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Austenitic Stainless Steel

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
    No. 176, Zhonghua South Street, Shijiazhuang, China.
    Tel: +86-311-89642206
    Fax:+86-311-67906676
    Web: www.metalspiping.com
    Email: sales@metalspiping.com