Stainless Steel Tradename UNS no. Werkstoff No. Density (g/cm3)
347 Stainless 347 S34700 1.4550 7.96
347H Stainless 347H S34709 1.4961 7.96

METLINE Industries is a leading manufacturer, supplier and exporter of stainless steel 347 (1.4550), and 347H (1.4961) buttweld pipe fittings, forged fittings and flanges.

METLINE offers a complete range of stainless steel 347 pipe fittings such as SS 347 reducer, SS 347 elbow, SS 347 tee, SS 347 cross, SS 347 end caps, SS 347 stub ends and SS 347 pipe bends. Stainless steel 347 and 347H pipe fittings are manufactured in compliance with ASTM A-403 and ANSI B16.9 / 16.28/ MSS SP-43 / Welding Bevel Standards ANSI B 16.25.

We specialise in the manufacture and supply of SS 347 pipe bends in both standard and non standard sizes, with bending radius of 1D to 10D or any other custom bending radius. We offer ex-stock delivery of various standard size and type SS 347 pipe fittings, SS 347 flanges and SS 347 pipe bends. Our specialty is to manufacture and supply large size fabricated 100% radiography tested SS 347 elbows, SS 347 reducers, SS 347 tees and SS 347 large diameter fabricated pipes.

347/347H stainless steel is type of common austenitic stainless steels such as 304, 316 and 321, but also contains columbium and is most widely used in high temperature applications. Stainless steel 347 has excellent forming and welding qualities, and the addition of columbium and tantalum helps for exceptional intergranular corrosion resistance.
Grade 347 is similar to grade 321, but with slightly improved corrosion resistance in strongly oxidizing environments. Stainless steel 347 is essentially non-magnetic in the annealed condition and can only be hardened by cold working.

METLINE also stocks and supplies a complete range of SS 316 | 316L pipes to complement our existing production range of SS 316 buttweld fittings and SS 316 flanges. Stainless steel 316/316L pipes can be supplied in cut to length sizes and also machined or fabricated to meet your custom piping requirements.

SS 347/347H Flanges Manufacturer/Supplier

SS 347/347H Flanges Manufacturer/Supplier

SS 347/347H Pipe Fittings Manufacturer/Supplier

SS 347/347H Pipe Fittings Manufacturer/Supplier

SS 347/347H Pipes Supplier/Stockholder

SS 347/347H Pipes Supplier/Stockholder

Key Properties of Stainless Steel 347 Pipe Fittings, SS 347 Flanges

  • Stainless steel 347H offers high temperature creep properties
  • Improved intergranular corrosion resistance
  • Superior general corrosion resistance over Type 321
  • Superior high temperature properties than 304 or 304L

Common Applications – SS 347 Pipe Fittings, 347 Flanges

  • Furnace parts
  • Pressure vessels and tanks
  • Industrial boilers
  • Pulp and paper processing equipment
  • Heat exchanger tubes
  • High temperature chemical processing equipment
  • Oil and petrochemical refineries

SS 347 Pipe Fittings Production Range

Specification ASTM A182 / A403 & ASME SA182 / SA403
Type Seamless / Welded / Fabricated
Variants 347, 347H
Bending Radius R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom
Range ½”NB to 48”NB in Sch 10s, 40s, 80s, 160s, XXS.
Dimensions ANSI/ASME B16.9, B16.28, MSS-SP-43.

Buttweld Stainless Steel 347/347H Pipe Fittings

Seamless/ Welded 100% Radiography Tested

Products Size
SS 347 Elbows – Long Radius SS 347 Stub Ends

Sizes 1/2″ – 48″

SS 347 Elbows – Short Radius SS 347 Crosses
SS 347 Reducing Elbows SS 347 Reducing Crosses
SS 347 45° Elbows SS 347 180° LR Return Bends
SS 347 Tees SS 347 180° SR Return Bends
SS 347 Fabricated Tees SS 347 Pipe Bends / Piggable Bends
SS 347 Reducers SS 347 Couplings
SS 347 Concentric Reducers SS 347 Pipe Nipples
SS 347 Eccentric Reducers SS 347 Forged/Plate Cut Rings
SS 347 3D Elbow SS 347 End Caps
SS 347 5D Elbow SS 347 Forged / Plate Circles

High Pressure Forged 347/347H Pipe Fittings

Threaded and Socket Weld Pipe Fittings

Products Size
SS 347 90° Elbows SS 347 Couplings

Sizes 1/8″ – 4″

Pressure Ratings –
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS

SS 347 45° Elbows SS 347 Reducers
SS 347 Street Elbows SS 347 Inserts
SS 347 Tees SS 347 Caps
SS 347 Crosses SS 347 Unions

Stainless Steel 347/347H Flanges

Forged and Plate Flanges

Specification ASTM A182 / A240 & ASME SA182 / SA240
Grade 347, 347H
Standard ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Size 1/8” to 36″
Dimensions ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.


Product Size
SS 347 Slip-On Flanges SS 347 Threaded Flanges

1/8″ – 36″

Raised Face or Flat Face

SS 347 Weld Neck Flanges SS 347 Socket Weld Flanges
SS 347 Blind Flanges SS 347 Reducing Flanges
SS 347 Lap Joint Flanges SS 347 Plate Flanges

Marking & Packing

Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All fittings and flanges are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.

Quality Assurance

At METLINE, all fittings and flanges are subject to strict inspection at each stage of the production process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality conformity of products.

Test Certificates: Manufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report