ASTM A213-Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes

ASTM A192 / A192M Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service

ASTM A210-Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes.

ASTM A519-Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing

ASTM A333-Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness.

Spiral steel pipe type is made by strip, seamless steel tube type is made by round steel, difference is very big, production process different:spiral tube is to use strip steel welding, can see the weld;