Stainless Steel 347 | EN 1.4550 | AISI 347 | SS 347 | SUS347 | Alloy 347 | UNS S34700

Stainless Steel 347 (1.4550)

347 Stainless Steel | DIN 1.4438 | AISI 347 Stainless Steel | X6CrNiNb18-10 | 0Cr18Ni11Nb | SAE 347 | Z6CNNB1810 | X6CrNiNb1811 | SS2338 | 347S31 | 08KH18N12B | J-347 | X04Cr18Ni10Nb | Alloy 347 | SUS 347

The 347 Stainless Steel (1.4550) with UNS S34700 is an austenitic stainless steel that gives the ideal corrosion resistance and has very low carbon content. AISI 347 (SS 347) is majorly used in thermal and welding processes. In the annealed condition SUS 347 is nonmagnetic and gets magnetic when welded. In the pulp and paper mills, Stainless Steel 347 shows good resistance due to the excess acidic surrounding.

347 Stainless Steel Properties

AISI 347 Stainless Steel has special properties typical to the product. The following sums up the qualities of 347 Steel.

  • Alloy 347 has good corrosion resistance.
  • In acidic chloride environments, SS 347 has greater corrosion.
  • The resistance is high with molybdenum alloy percentage.
  • SUS 347 is resistant to sulphuric acid at around 120 degrees Fahrenheit.
  • 347 SS has good formability and weldability.

347 Stainless Steel Applications

1.4550 Stainless Steel (S34700) is used in flue gas desulfurization systems and is also a regular component in petrochemical industries. The chemical process vessels and pulp and paper industry also use AISI 347. Stainless Steel 347 is also used in condensers in power generation.

Fabrication and Heat Treatment 


Grade 347 is tougher than other grades of 304 Stainless Steel. Thus, it is advised to use chip breakers so that the harden-ability of this alloy is considerably brought down with the help of low speeds and constant feeds.


Usually, this grade of stainless steel is welded with the help of fusion and resistance. Normally the oxyacetylene welding method is more preferred for this alloy. One can also use the 347 filler metal which gives a good result.

Hot Working

This grade of stainless steel is hot and is worked using the regular hot working processes. This is normally heated at around 1149 to 1260 degrees centigrade and should not be heated at a temperature below 927 degrees Fahrenheit. The post work annealing is done to be able to keep the property of corrosion resistance intact.

Cold Procedure

This process involves stamping, drawing, shearing as well as heading which is done successfully. The post work annealing is normally done to bring down the internal stress.

Annealing and Hardening

Annealing is usually done at 1010-1121°C (1850-2050°F) which is then followed by cooling. Hardening normally does not react to any kind of treatment and is hardened by the working of cold treatment.

Forms of Stainless Steel 347

SS 347 Chemical Composition :

Element:Content (%)
Cr 17.0019.00
Ni9.00 13.00
Si 0.75
S 0.03
Cb & Ta10 x (C + N) 1.00

SS 347  Mechanical Properties :

Yield Strength
0.2% Offset
psi (min.)30, 000
Ultimate Tensile
psi (min.)75, 000
in 2 in.
% (min.)40
Hardness(max.)201 Brinell

SS 347  Physical Properties :

Density7.96 g/cm3
Specific Heat0.12 BTU/lb-°F (32 – 212°F)
Modulus of Elasticity28.0 x 106 psi
Thermal Conductivity 200°F (100°C)133 BTU/hr/ft2/ft/°F
Melting Range
2550 – 2635°F
Electrical Resistivity72 Microhm-cm at 20°F

SS 347  Applications :

  • Chemical / petrochemical processing
  • Equipment for pollution control (flue gas desulfurization) Plants
  • Waste disposal industries
  • Sulfuric acid reactors.
  • Organic chloride process equipment.
  • Equipment for processes utilizing halide or acid catalysts.
  • Pulp and paper processing

 Equivalent Grades and Other Names :

  • Alloy 347
  • AISI 347
  • Japan JIS – SUS 347
  • UNS S34700
  • SS 347
  • SAE 347
  • France AFNOR – Z6CNNB1810
  • Germany – DIN – X6CrNiNb1811
  • ITALY UNI – X04Cr18Ni10Nb
  • Sweden – SS 2338
  • UK BSI – 347S31
  • Russia Gost – 08KH18N12B
  • J-347
  • WNR 1.4550
  • EN 1.4550
  • DIN 1.4550

Siddhagiri Metals and Tubes – Stainless Steel 347 Supplier Manufacturer :

  • 347 Stainless Steel Pipes

  • 347 Stainless Steel  Tubes

  • 347 Stainless Steel Pipe Fittings

  • 347 Stainless Steel Tube Fittings 

  • 347 Stainless Steel Flanges

  • 347 Stainless Steel Forged Fittings

  • 347 Stainless Steel Fasteners

  • 347 Stainless Steel Sheet Plate

  • 347 Stainless Steel Bar

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347 Stainless Steel (UNS S34700)
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