Americal Society for Testing and Materials (ASTM) has researched and defined various material standards for oil and gas industry. Properties of these materials depend on chemical properties of fluids to be handled, design temperatures and pressure as well of method of manufacture of pipe fittings. Many piping fittings like socket weld and threaded fittings, flanges are made with forging process. Here is a list of such ASTM Standard materials designed for fittings made with forging operation.
| Sr. | Number | Title |
| 1 | A105 | Standard Specification for Carbon Steel Forgings for Piping Applications. |
| 2 | A181 | Standard Specification for Carbon Steel Forgings, for General-Purpose Piping. |
| 3 | A182 | Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service. |
| 4 | A350 | Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components. |