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SS347

Similar to SS321, stainless steel 347(SS347) is an austenitic stainless steel with deliberate addition of tantalum(Ta) and niobium(Nb) to the basic stainless steel 304(SS304). The Nb+Ta addition reduces the sensitization of carbide precipitation during welding process which also improves its resistance to intergranular corrosion. The applicable temperature range of SS347 is from 427°C to 899°C. The SS347 is primarily used for high-temperature gaskets, expansion joints, exhaust manifolds, superheaters & heat exchangers, boilers and chemical piping components, etc.

ASTM A213 TP347 seamless pipes, O.D=219mm, W.T=30mm.

ASTM A213 TP347 seamless pipes, O.D=219mm, W.T=30mm.

1. UNS Designation & International Equivalent

TypeUNSJISEN/DINEN/BSEN/NFISOGBGOST
347S34700SUS347X6CrNiNb18-10347S31X6CrNiNb18-10160Cr18Ni11Nb08KH18H12B

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, A213, A249, A813, A814, A632
Wrought Pipe FittingsASTM A403
*Especially, Metals-Piping supplies SS347 in the grades of ASTM A312 TP347, ASTM A182 F347, ASTM A403 WP347.

3. Physical Properties of SS347

ASTM A182 F347 ring gaskets, R24

ASTM A182 F347 ring gaskets, R24 made to ASME B16.20.

The Physical Properties of SS347
Density(lb/cu. in.)0.29
Specific Gravity8.03
Specific Heat(Btu/lb/Deg F)0.12
Electrical Resistivity(microhm-cm)438
Melting Point(Deg F)2600

5. Chemical Composition of SS347

The Chemical Composition of SS347, %
Carbon≤0.08
Manganese≤2.00
Phosphorus≤0.045
Sulfur≤0.030
Silicon≤0.75
Chromium17.0-19.0
Nickel9.0-13.0

6. Mechanical Properties of SS347

Tensile Strength, min.Yield Strength, min.ElongationHardness
ksiMpaksiMpa%HBWRockwell
75515302054020192HRBW

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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