ASTM A961 – Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications
This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications. If the primary melting is required it shall incorporate separate degassing or refining and may be followed by secondary melting, such as electroslag remelting or vacuum remelting. If secondary melting is employed, the heat shall be defined as all of the ingot remelted from a single primary heat. Material requiring heat treatment shall be treated as specified in the individual product specification using the following procedures such as full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving. Heat analysis shall be used to determine the percentages of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, tantalum, copper, cobalt, nitrogen, aluminum, vanadium, cerium to meet the required chemical composition. The product analysis shall be used to determine if the chemical composition shall conform to the limits of the product specified. Mechanical tests shall be performed to determine the mechanical properties such as hardness, tensile properties, and impact properties.
1.1 This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications under any of the following individual product specifications:
|Title of Specification
|Forgings, Carbon Steel, for Piping Components
|Forgings, Carbon Steel, for General-Purpose Piping
|Forged or Rolled Alloy-Steel Pipe Flanges, Forged
| Fittings, and Valves and Parts for High Temperature
|Forgings, Carbon and Low Alloy Steel, Requiring Notch
|Toughness Testing for Piping Components
|Forged or Rolled 8 and 9 % Nickel Alloy
|Steel Flanges, Fittings, Valves, and Parts
|for Low-Temperature Service
|Forgings, Carbon and Alloy Steel, for Pipe Flanges,
| Fittings, Valves, and Parts for High-Pressure
|Flanges, Forged, Carbon and Alloy Steel for Low
|Forgings, Carbon Steel, for Piping Components with
|Inherent Notch Toughness
|Forgings, Titanium-Stabilized Carbon Steel, for
|Glass-Lined Piping and Pressure Vessel Service
1.2 In case of conflict between a requirement of the individual product specification and a requirement of this general requirement specification, the requirements of the individual product specification shall prevail over those of this specification.
1.3 By mutual agreement between the purchaser and the supplier, additional requirements may be specified (see Section 4.1.2). The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon between the purchaser and supplier.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and the tables, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply, unless the “M” designation (SI) of the product specification is specified in the order.