ANSI, ASTM and API Designations for Piping

ANSI Designation ASTM or API Designation


B36.1 ASTM A53 Welded and Seamless Steel Pipe
B36.2 ASTM A72 Welded Wrought Iron Pipe
B36.3 ASTM A106 Seamless Carbon-Steel Pipe for High-Temperature Service
B36.20 ASTM A120 Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless Steel Pipe for Ordinary Uses
B36.4 ASTM A134 Electric-Fusion (Arc)- Welded Steel Plate Pipe, Sizes 16 in. and Over
B36.5 ASTM A135 Electric-Resistance-Welded Steel Pipe
B36.9 ASTM A139 Electric-Fusion (Arc)-Welded Steel Pipe, Sizes 14 in. and Over
B36.11 ASTM A155 Electric-Fusion-Welded Steel Pipe for High-Temperature Service
B36.16 ASTM A211 Spiral-Welded Steel or Iron Pipe  
B36.26 ASTM A312 Seamless and Welded Austenitic Stainless Steel Pipe > Redesignated B125.16
B36.40 ASTM A333 Seamless & Welded Steel Pipe for Low-Temp Service > Redesignated B26.27
B36.42 ASTM A335 Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
B36.47 ASTM A358 Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service
B36.48 ASTM A369 Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service
B36.43 ASTM A376 Seamless Austenitic Steel Pipe for High-Temperature Central-Station Service
B36.49 ASTM A381 Metal-Arc Welded Steel Pipe for High-Pressure Transmission Service
B36.44 ASTM A405 Seamless Ferritic Alloy-Steel Pipe Specially Heat Treated for High-Temp Service
  ASTM A419 Electric-Fusion (Arc)-Welded Wrought Iron Plate Pipe
  ASTM A523 Plain End Seamless and Electric-Resistance-Welded Steel Pipe for High-Pressure Pipe-Type Cable Circuits
B36.56 ASTM A524 Seamless Carbon Steel Pipe for Process Piping
B36.57 ASTM A530 General Requirements for Specialized Carbon Steel and Alloy
  API 5L Line Pipe
  API 5LX High-Test Line Pipe
  API 5LS Spiral Weld Line Pipe

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