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What is the Criteria for the choice of metals for flanges and fittings?

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Nimika Lope
What is the Criteria for the choice of metals for flanges and fittings?

There are many characteristics that need to be evaluated in selecting the most suitable metal for flanges and fittings. The choice of one or the other metal responds not only to the peculiar characteristics of the metal itself, but mainly starts from the final product. Specifically on how this should be machined and sometimes notched.


The most important characteristics are as follows:


  • Malleability: for a metal to be considered malleable it must retain intact structural characteristics in the face of excessive force or pressure. In essence, it must not exhibit fracture or physical transformation. This is something to consider when the flange or fitting is intended for very harsh environments.
  • Hardness: this refers to the ability of the metal not to deform as a result of strong pressure applied.
  • Electrical conductivity: this refers to the metal’s ability to conduct electricity.


The most commonly used materials for flanges and fittings are stainless steel, carbon steel and alloy steels.


Regarding the dimensions of pipe fittings and flanges, the key global specifications to be followed are as below:


  • BW fittings: ASME B16.9; ASME B16.25; DIN 2605; DIN 2615; DIN 2616; DN 2617; MSS-SP 25; MSS-SP 75; AFNOR NFA49-281; ISO 5251
  • Forged fittings: made of forged steel (carbon and stainless steel) according to ASTM/AMS-MSS SP44 international standards and with reference to ANSI B16, 11, B36, 10, BS 3799, MSS-SP83.
  • Compression fittings: carbon and stainless steel give fittings for high pressure, with reference to DIN 2353 standards from D. 6mm to D. 28mm
  • As for flanges, the main standards to be followed are - ASME B16.5/16.36/16.47; UNI, DIN, BD, EN 1092


About Us

 

With a collective experience of over 30 years, Metline Industries is a professional pipe fittings manufacturersteel pipe manufacturers and one-stop-shop supplier for steel piping system products, including steel plates, steel pipe and tube, forged flange and fittings, butt-welding pipe fittings, elbow, tee, reducer, stub end, gaskets, fasteners, valves, etc. in India.


Metline specialises in manufacturing welded and seamless pipesbuttweld fittings, flanges and forged fittings, such as carbon/stainless steel elbows, tees, reducers, caps, pipe bends, dish ends and pipe sleeve as per ASME/ASTM, DIN and other known specifications. These steel pipe fittings are widely used in nuclear power stations, power plants, shipbuilding, paper manufacturing, pharmaceutical plants, oil refineries, petrochemical plants, and natural gas pipeline projects. We are always focused on providing high-quality and high performance alloy steel fittings, carbon steel fittings, and stainless steel pipe fittings solutions for small fabrication projects and large size turnkey projects.


Our increasing list of customers includes domestic and international end user companies, international traders/distributors, as well as pipe fittings traders and suppliers based in India. Stainless steel elbows and stainless steel bends used in pipeline systems in various industries are available in a variety of shapes and sizes. Besides, we also can produce other non-standard size 100% X-Ray welded stainless steel pipe fittings as per technical drawings provided by our customers. One of our key strengths is to manufacture and supply high quality long radius elbows, double flanged pipes, piggable bends and large diameter fabricated pipes in stainless steel, carbon steel, alloy steel and nickel alloy grades.


We also run an operate one of the biggest stainless steel, aluminium and nickel alloys service center in India. We have in house slitting, cutting and machining facilities to offer custom size and custom made products to our customers across the globe. We are one of the leading steel pipe manufacturers and suppliers, stainless steel pipe manufacturersstainless steel pipesflange manufacturersstainless steel bar supplierssteel plate suppliersstainless steel plate suppliersseamless pipe manufacturerserw pipe manufacturersscrap steel buyers and aluminium plate suppliers in India.

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