What is the difference between ASTM A358 and A312?
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ASTM A358 ASTMA358/A358M-2015 Electrofusion welded austenitic chromium-nickel stainless steel pipe for high temperature equipment and general equipment.
ASTM A312 seamless welded and deep cold worked austenitic stainless steel pipe.
ASTMA312 requires stainless steel pipes to be processed without adding any filler metal.
welding. ASTM A358 requires welds to be joined by adding filler metal.
Additionally, both require 100% X-ray inspection to ensure pipe quality
ASTM A358 is mainly used in high-temperature equipment and general equipment, while A312 is widely used in petrochemical industry, natural gas transportation and other fields.
ASTM A-358/A-358M Specification for electrofusion welded chromium-nickel austenitic stainless steel pipes for high temperature and general use. Products shall comply with the requirements of TSG D7002 Type Test Rules for Pressure Piping Components. Common grades: 304, 304L, 304H, 310S, UNS S31254, 316L, 316H, 317, 321, 321H, 347, 347H, UNS N08810, UNS N08811, and more grades.
Common specifications: outer diameter 57mm~2680mm, thickness: 1.2mm~60mm.
Production method: welding (Class 1, Class 2, Class 3, Class 4, Class 5)
Delivery status: heat treatment + pickling.
ASTM A312 standard covers a variety of specifications and grades of stainless steel pipes, including seamless, welded and deep cold-worked types, with outer diameters ranging from 57mm to 1626mm and wall thicknesses from 1.2mm to 60mm.
Common grades: TP304, TP304L, TP316, TP316L, TP321, TP347H, etc. Each grade has its specific chemical composition and mechanical properties.
