Sch 40 black steel pipe is uncoated steel, also known as black steel.

ASTM 53 Schedule 80 Pipe

Stainless steel yield strength test and inspection proces： tensile test and hardness test

A standard for the standardization of welded and seamless forged steel pipes covering high temperature or low pressure and high pressure.

ASTM A106 seamless pipes (also known as ASME SA106 pipes) are commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers and ships.

ASTM A500 is a standard specification published by ASTM International for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes.