Carbon Seamless Pipes

A carbon steel pipe is made primarily from iron and carbon, with controlled amounts of other elements. It is widely used for transporting water, oil, gas, steam, and air, as well as in mechanical and structural applications.

Carbon steel describes the pipe’s material, while black steel describes its surface finish. Most black steel pipe is carbon steel pipe with a dark mill-scale or oxide surface and no zinc coating. Carbon steel pipe can also be galvanized, painted, or coated.

Common problems include corrosion, pitting, scale buildup, and gradual wall-thickness loss when the pipe lacks suitable protection. A seamless carbon steel pipe may also have dimensional issues such as eccentric wall thickness, ovality, or surface defects if manufacturing control is inadequate.

No. ASTM A53 covers welded and seamless black or galvanized pipe for general mechanical and pressure applications. ASTM A106 covers only carbon steel seamless pipe intended for high-temperature service. Some Grade B pipes can be dual-certified when they meet every requirement of both standards.

ASTM A106 Grade B is a seamless carbon steel pipe specification for high-temperature service. It is commonly used in power plants, refineries, boilers, petrochemical facilities, and process piping that transports fluids or gases at elevated temperatures. The required size, schedule, testing, and heat treatment must follow the project specification.