This Malaysian Standard 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. Although this specification covers some piping components machined from rolled bar and seamless tubular materials, it does not cover raw material produced in these product forms.
No limitation on size is intended beyond the ability of the manufacturer to obtain the specified requirements.However, Class 3 of Grade LF787 is only available in the quenched-and precipitation heat treated condition.
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.
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 material shall be furnished to inch-pound un