Pipe Fittings Material Standard

ASTM A350 Standard Specification for Carbon and Low-Alloy Steel Forgings,Requiring Notch Toughness Testing for Piping Components

1.1 This specification2 covers several grades of carbon and low-alloy steel forged or ring-rolled flanges,forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions,or to dimensional standards,such as the ASME and API Specifications referenced in Section 2.Although this specification covers some piping components machined from rolled bar and seamless tubular materials(see 5.3.3),it does not cover raw material produced in these product forms.

1.2 No limitation on size is intended beyond the ability of the manufacturer to obtain the specified requirements. How-ever, Class 3 of Grade LF787 is only available in the quenched-and-precipitation heat treated condition.

1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified by the purchaser in the order.

1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable"M"specification designation (SI units),the mate-rial shall be furnished to inch-pound units.

1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents;therefore,each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specifi-cation.