Stainless Steel EFW Welded Pipe is a type of stainless steel pipes that is produced through electric fusion welding. The electric fusion welding is a process in which high voltage electricity is passed onto the material to heat and melt it. These pipes are welded by rolling the plates and welding the seam and then cleaning the weld flash with scarfing blades.

Reference Standards

ASTM A 358/A 358M  Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service. 

Five Classes of pipes are covered :

ASTM A358 Class 1 - Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.

ASTM A358 Class 2 - Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.

ASTM A358 Class 3 - Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.

ASTM A358 Class 4 -Pipe Same as ASTM A358 Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal.

ASTM A358 Class 5 - Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.

ASTM A409/SA409             Welded Large Diameter Austenitic Steel Pipe for Corrosive or High Temperature Service
ASTM A778/A78M              Welded, Unannealed Austenitic Stainless Steel Tubular Products
ASTM A789/ASME SA789 Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A790/ASME SA790 Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
ASTM A813/A813M Single- or Double-Welded Austenitic Stainless Steel Pipe
ASTM A814/A814M Cold-Worked Welded Austenitic Stainless Steel Pipe

DIN 17455 Welded circular stainless steel tubes with general quality requirements -Technical delivery conditions
DIN 17457 Welded circular austenitic stainless steel tubes subject to special requirements

EN 10216-5 Welded Stainless Steel Tube
EN 10296-2 Welded circular steel tubes for mechanical and general engineering purposes - Part 2: Stainless steel

JIS G3468  Large Diameter Welded Stainless Steel Pipes
JIS G3446 Stainless Steel Pipes for Machine and Structural Purposes