347/347H Stainless Steel Pipe/Tube, Flanges, Fittings

Stainless Steel 347 UNS S34700 is advantageous for high temperature service because of its good mechanical properties . SS 347 also has excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500 F. SS 347 is similar to SS 321 with respect to intergranular corrosion which is achieved through the use of columbium as a stabilizing element to maximize this feature. SS 347 can not be hardened through heat treating, but elevated properties may be obtained through cold reduction. SS 347H is a modification of SS 347 with a higher carbon content, to provide improved high temperature strength.

Composition of 347/347H tubing and pipe




UNS Designation



 Carbon (C) Max.



Manganese (Mn) Max.



Phosphorous (P) Max.



Sulphur (S) Max.



Silicon (Si) Max.



Chromium (Cr)



Nickel (Ni)



Molybdenum (Mo)



Nitrogen (N)



Iron (Fe)



Other Elements




Stainless Steel SS 347 / 347H


347 / 347H


S34700 / S34709

Werkstoff Nr.

1.4550 / 1.4961

Mechanical & Physical Properties


8.0 g/cm3

Melting Point

1454 °C (2650 °F)

Tensile Strength

Psi – 75000 , MPa – 515

Yield Strength (0.2%Offset)

Psi – 30000 , MPa – 205


35 %

We have products:

Stainless steel hexagon pipe seamless hexagonal shape; Forged steel pipe fitting high pressure rating fitting; ASTM A312 TP347H Stainless Steel Seamless Pipe For Fluid Transportation; 347 , 321 , 316Ti , 317L Stainless Steel Pipe 0 To 40 SWG Bevel End / Plain End; 9.53 * 0.89MM Super Long Coiled Tubing , 300 Series Stainless Steel Material , ASTM A269 / A213; WP321 / 1.4541 Flanges Pipe Fittings For Connection , ASTM A403 Stainless Steel Tee; ASME B16.5 WP316L / 317 / 347 Stainless Steel Equal Tee Pipe Fitting; ASTM A403 TP321 / 317 Stainless Steel Pipe Fitting, Reducing Tee; DN150 Sch40 ANSI B16.5 WP347 / 347H Stainless Steel Equal Tee; 400LB F347 / 347H Stainless Steel Socket Welding Flange; ASTM A269 TP347 / TP347H Heat Exchanger Tube Stainless Steel U Bend Tube; 3 / 8 Inch 17.1mm TP321 / 321H Stainless Steel Seamless Coiled Tubing With Cold Rolled; 1 / 8 Inch TP321H Stainless Steel Welded Super Long Marine Multi-core Coiled Tubing; 1 / 4 Inch Sch10s TP347 / 347H Stainless Steel Welded Multi-core Coiled Tubing; 20 / 22 / 24SWG ASTM A269 TP321H Stainless Steel Welded Tube With Bright Annealed Surface; ASTM A213 / ASME SA213 18BWG TP347 / 347H Stainless Steel Bright Annealed Welded Tube; ASTM A312 / ASME SA312 TP347 / 347H Austenitic Stainless Steel Pipe In Fluid And Gas; ASTM A790 / ASME SA790 TP317 Austenitic Stainless Steel Pipe For Oil And Gas; 12 Inch Sch40 TP347 / 347H Austenitic Stainless Steel Pipe With Annealed & Pickled Surface; ASTM A269 TP321 / 321H Stainless Steel Heat Exchanger U Bend Welded Tube For Boiler; 1 Inch TP321 / 321H Stainless Steel Heat Exchanger U Bend Welded Tube For Chemical Industry; ASTM A249 / ASME SA249 ERW Stainless Steel Heat Exchanger Welded Tube; ASTM A358 / ASME SA358 TP347 / 347H EFW Class1 Stainless Steel Double Welded Pipe; ASTM A358 / ASME SA358 TP321 / 321H Annealed & Pickled Stainless Steel Double Weled Pipe; ASME / ANSI B16.5 F347 / 347H Stainless Steel Welded Neck Flange RF; ASTM A182 F321 / 321H CL300 Stainless Steel Forged Blind Flange; Class1500 ASME / ANSI B16.5 F347 Stainless Steel Welded Neck Flange For Connection; Cold Rolled Stainless Steel Sanitary Tube, TP347 / 347H With Bright Annealed Surface; TP321 / 321H Stainless Steel Sanitary Tube For Boiler, ASTM A213; 3 / 4 Inch Sch40s Precision Stainless Steel Tube, TP347 / 347H Seamless Tube; 10 / 12 / 14SWG Precision Stainless Steel Seamless Tube With Cold Rolled For Medical Industry; TP347 / 347H Stainless Steel Seamless Instrument Tubing With Bright Annealed Surface; ASTM A269 / ASME SA269 TP321 / 321H Stainless Steel Seamless Instrument Tubing; ASTM A213 / A269 TP309S / 310S Stainless Steel Seamless Instrument Tube With Cold Rolled; TP347 / 347H Stainless Steel Seamless Instrument Tubing With Bright Annealed Surface; ASTM A269 / ASME SA269 TP321 / 321H Stainless Steel Seamless Instrument Tubing; TP317L ASTM A269 / ASME SA269 Stainless Steel Seamless Instrument Tube; ASTM A269 Stainless Steel TP347 / 347H Seamless Hydraulic Tube With Cold Rolled; Threaded End F347 Stainless Steel Hex Nipple 2000LBS Forged High Pressure Pipe Fitting; 3 Inch ASTM A182 F347 Stainless Steel 2000LBS Round Head Plug With Treaded End; ASME B16.11 F347 Stainless Steel Forged Union High Pressure Pipe Fittings With Socket Welded/Threaded; 25.4 X 2.11mm TP347/321H Seamless U Bend Tube For Petroleum Refining; 25.4mm TP321/347H Stainless Steel Pickled Heat Exchanger Tube;
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