SA 106 Grade B is a specification under the ASME (American Society of Mechanical Engineers) standard, commonly referred to as ASTM A106 Grade B in non-ASME contexts. This specification covers seamless carbon steel pipe for high-temperature service. The pipes are typically used in industries like oil and gas, power generation, petrochemical, and refineries, where high-temperature environments are common.

Chemical Composition:

Carbon (C): 0.30% max

Manganese (Mn): 0.29-1.06%

Phosphorus (P): 0.035% max

Sulfur (S): 0.035% max

Silicon (Si): 0.10% min

Mechanical Properties:

Tensile Strength: 60,000 psi (415 MPa) minimum

Yield Strength: 35,000 psi (240 MPa) minimum

Elongation: Varies depending on the thickness of the pipe, typically around 30% minimum for thicker sections and 16% minimum for thinner sections.

Key Features:

High Temperature Resistance: SA 106 Grade B is designed for high-temperature applications, making it suitable for steam lines, boiler piping, and other high-temperature pipelines.

Seamless Construction: Being a seamless pipe, it offers better resistance to pressure and temperature compared to welded pipes.

Good Weldability: It can be easily welded using most standard welding methods.

Applications:

Power Plants: Used in the piping of steam and boiler systems.

Petrochemical Industries: For transportation of gases and fluids at high temperatures.

Oil and Gas: Piping systems for oil refineries, pipelines, and natural gas.

Summary:

SA 106 Grade B is a high-strength, seamless carbon steel pipe designed to withstand high temperatures and pressures, making it a reliable choice for demanding industrial applications.