Stainless Steel Tradename UNS no. Werkstoff No. Density (g/cm3)
904L 904L N08904 1.4539 8.00


METLINE Industries is a leading manufacturer and supplier of stainless steel 904L buttweld pipe fittings and 904L flanges. METLINE offers a complete range of stainless steel 904L pipe fittings such as SS 904L reducer, SS 904L elbow, SS 904L tee, SS 904L cross, SS 904L end caps, SS 904L stub ends and SS 904L pipe bends. Stainless steel 904L pipe fittings are manufactured in compliance with ASTM B 366/ASME SB 366 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 904L 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 904L pipe fittings, SS 904L flanges and SS 904L pipe bends. Our specialty is to manufacture and supply large size fabricated 100% radiography tested SS 904L elbows, SS 904L reducers, SS 904L tees and SS 904L large diameter fabricated pipes.

UNS NO8904, commonly known as 904L stainless steel, is a low carbon austenitic nickel-chromium stainless steel with additions of molybdenum and copper. 904L pipe fittings, 904L flanges and 904L product forms are mainly used where the corrosion resistant properties of 316L and 317L are inadequate, especially in severe corrosive conditions.

Due to the combination of high contents of chromium, nickel, molybdenum and copper, stainless steel 904L pipe fittings and 904L flanges exhibit greater resistance to pitting and crevice corrosion and to general corrosion in reducing acids.

When compared to 2205 grade duplex stainless steel, 904L has similar corrosion resistant properties but lower mechanical strength. 2205 is also a lower cost option compared to 904L, but is not suitable for temperatures above 300°C. Overall among the three grades i.e. 904L, 316L and 2205, 316L stainless steel is the lowest cost option, but offers comparatively lower corrosion resistance.

Stainless steel 904L fittings, and 904L flanges are widely used for manufacturing tanks, vessels, piping, heat exchangers, and other equipment used for handling sulphuric, phosphoric and acetic acids, bleaching operations in the pulp and paper industry. In addition, 904L tube and 904L pipe fittings are widely used for general piping requirements in the oil and gas, chemical and pharmaceutical industries.

METLINE also stocks and supplies a complete range of SS 904L seamless pipes to complement our existing production range of SS 904L buttweld fittings and SS 904L flanges. Stainless steel 904L pipes can be supplied in cut to length sizes and also machined or fabricated to meet your custom piping requirements.

SS 904L Flanges Manufacturer/Supplier

SS 904L Flanges Manufacturer/Supplier

SS 904L Pipe Fittings Manufacturer/Supplier

SS 904L Pipe Fittings Manufacturer/Supplier

SS 904L Pipes Supplier/Stockholder

SS 904L Pipes Supplier/Stockholder

Key Properties of Stainless Steel 904L Pipe Fittings, SS 904 Flanges

  • High resistance to pitting and crevice corrosion
  • Excellent resistance to stress corrosion cracking
  • Strong resistance to intergranular corrosion
  • Good formability and weldability

Common Applications – SS 904L Pipe Fittings, SS 904L Flanges

  • Pulp and Paper Industry
  • Condensers
  • Heat exchangers
  • Sea water equipment
  • Chemical equipment
  • Pharmaceutical equipment

904L Pipe Fittings Production Range

Specification ASTM B 366 / ASME SB 366
Type Seamless / Welded / Fabricated
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 904L Pipe Fittings

Seamless/ Welded 100% Radiography Tested

Products Size
SS 904L Elbows – Long Radius SS 904L Stub Ends

Sizes 1/2″ – 48″

SS 904L Elbows – Short Radius SS 904L Crosses
SS 904L Reducing Elbows SS 904L Reducing Crosses
SS 904L 45° Elbows SS 904L 180° LR Return Bends
SS 904L Tees SS 904L 180° SR Return Bends
SS 904L Fabricated Tees SS 904L Pipe Bends / Piggable Bends
SS 904L Reducers SS 904L Couplings
SS 904L Concentric Reducers SS 904L Pipe Nipples
SS 904L Eccentric Reducers SS 904L Forged/Plate Cut Rings
SS 904L 3D Elbow SS 904L End Caps
SS 904L 5D Elbow SS 904L Forged / Plate Circles

High Pressure Forged 904L Pipe Fittings

Threaded and Socket Weld Pipe Fittings

Products Size
SS 904L 90° Elbows SS 904L Couplings

Sizes 1/8″ – 4″

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

SS 904L 45° Elbows SS 904L Reducers
SS 904L Street Elbows SS 904L Inserts
SS 904L Tees SS 904L Caps
SS 904L Crosses SS 904L Unions

Stainless Steel 904L Flanges

Forged and Plate Flanges

Specification ASTM A240, ASME SA240, ASTM B 649 / ASME SB 649
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.


Products Size
SS 904L Slip-On Flanges SS 904L Threaded Flanges

1/8″ – 36″

Raised Face or Flat Face

SS 904L Weld Neck Flanges SS 904L Socket Weld Flanges
SS 904L Blind Flanges SS 904L Reducing Flanges
SS 904L Lap Joint Flanges SS 904L 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