Piping Materials of Construction

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A material of construction for a particular fitting or part of a composite fitting like valve, steam traps etc. must be carefully chosen based on various factors like :

  1. Fluid Nature : corrosiveness, toxicity, flammability, viscosity.
  2. Service pressure and temperature.
  3. Fluid nature : Corrosive, Food industry etc.
  4. Fabrication method : Forging, casting and from plates.
  5. Availability.
  6. Environment (Desert, Temperate, Marine)
  7. Price (Economy)

Lists of Piping Materials

Piping hardware generally includes Pipes, Fittings, Valves, Special Items like steam traps, strainers, filters etc. Here is a list of ASTM materials used for manufacturing of various piping parts.

Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and …Read More..
Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and …Read More..
Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and …Read More..
Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and …Read More..
Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil …Read More..

Selection Criteria

  1. Big bore flanged valves and components are mostly manufactured by Casting.
  2. Small bore flanged valves, socket welded and threaded components are mostly forged.
  3. Components like spectacle blind, Strainers etc. are made using plates.
  4. Materials are selected based on their mechanical and metallurgical properties.
  5. Mechanical properties: strength, ductility, hardness, brittleness, toughness
  6. Metallurgical properties: Chemical composition, weldability.
  7. Carbon increases strength of steel but decreases weldability.
  8. Carbon steel used in piping has carbon content between 0.15% to 0.30%.

Various Categories of Steel

Based on the chemical compositions, Steel can be categorized into four basic groups:

  1. Carbon Steel
  2. Alloy Steel
  3. Stainless Steel
  4. Tool Steel
Carbon steel is the most utilized steel in the industries and accounts for more than …Read More..
In alloy steel, varying proportions of alloying elements are used, in order to achieve desired …Read More..
Stainless Steel is an alloy steel with chromimum content more than 10.5% and less than …Read More..
Killed Steel is a Deoxidized steel that has all of the oxygen removed from the melt during the steel …Read More..
Tool steels have high carbon content (0.5% to 1.5%). Higher carbon content provides higher hardness …Read More..

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