ASTM A312

Stainless Steel Pipe Specification Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

ASTM A312 pipe is common use stainless pipe for industries. It covers diameters from 1/8” to 30” and thickness from SCH 10S to SCH 80S. General use material grades are TP304/304L, TP316/316L.

A312 pipe Manufacturing Types ASTM A312 stainless steel pipe and tube covers following manufacturing types (Including hot finished or cold finished): a. Seamless Pipe (SMLS): It covers stainless steel seamless pipe or tube in hot rolling or cold drawn. b. Welded Pipe (WLD): Welded by an automatic welding process that does not add filler metal when welding. c. Cold Worked Pipe (HCW pipe): The heavy cold-worked pipe that apply cold working of not less than 35% reduction in thickness of both wall, and welded to the welded pipe prior to final annealing. Do not use fillers during welding. d. Welded and HCW pipe: Welded pipe and HCW pipe of 14 and smaller than NPS 14 shall have a single longitudinal weld. After approval by the purchaser, the welded pipe and HCW pipe with an NPS greater than NPS 14 shall have a single longitudinal weld or shall be manufactured by forming and welding two longitudinal sections of flat stock. So each welds are to be tested, inspected, inspected.

Type 316L is the low carbon version of 316 stainless. With the addition of molybdenum, the steel is popular for use in severe corrosion environments due to the materials immunity from boundary carbide precipitation (sensitisation). The material is widely used in heavy gauge welded components and weld annealing is only required where the material is for use in high stress environments. 316L has an extensive variety of uses especially in marine applications due to the materials high corrosion resistance. Benefits of using Type 316L Stainless Steel Low carbon content eliminates carbon precipitation in the welding process Can be used in severe corrosive environments Improved anti-corrosion scope due to added Molybdenum Weld annealing only required in high stress applications Very similar to Grade 316 in chemical composition and mechanical properties 316 & 316L steel plate and pipes have common properties and are often stocked with Dual Certification, where it is determined that both have properties and composition which comply with both steel types. Type 316H is excluded from this scenario by virtue of the fact that unlike 316 & 316L, 316H is engineered to work in elevated working temperatures.

Mechanical Properties 20℃

Physical Properties 20℃