A106 Gr. B

A106 Gr. B

ASTM A106 Grade B a standard specification for seamless carbon steel pipe used in high-temperature services. It’s commonly used in the construction of pipelines, oil and gas refineries, power plants, boilers, and petrochemical facilities.

Chemical Composition of A106 Gr. B

The chemical composition of A106 Gr. B is as follows:

Element	Composition (%)
Carbon (C)	0.30
Manganese (Mn)	0.29–1.06
Phosphorus (P)	0.035
Sulfur (S)	0.035
Silicon (Si)	0.10 min
Copper (Cu)*	0.40
Nickel (Ni)*	0.40
Chromium (Cr)*	0.40
Molybdenum (Mo)*	0.15

These elements contribute to the steel's strength, toughness, and resistance to high-temperature oxidation.

Mechanical Properties of A106 Gr. B

Below are the mechanical properties of A106 Gr. B, which demonstrate its suitability for high-temperature and pressure applications:

Property	Value
Tensile Strength	≥ 60,000 psi (415 MPa)
Yield Strength	≥ 35,000 psi (240 MPa)
Elongation	≥ 30% (varies by thickness)
Hardness (typical)	≤ 241 HB (Brinell)

The mechanical properties are designed to withstand the pressures and high temperatures in boiler systems, heat exchangers, and other applications that require heat transfer efficiency and resistance to thermal fatigue.

Standard Specifications for A106 Gr. B

A106 Gr. B conforms to the following recognized international standards:

• ASTM A210 - Standard Specification for Seamless Medium Carbon Steel Boiler and Heat-Exchanger Tubes.
• ASME SA210 - The ASME Boiler and Pressure Vessel Code also references A106 Gr. B for use in steam boilers and heat exchangers in power plants and chemical processing units.
• API 5L - Also used in some cases for **pressure tubes** in the oil and gas industry, although more commonly for high-carbon steels.

Applications of A106 Gr. B

A106 Gr. B is commonly used in the following applications:

• Designed for high-temperature service
• Suitable for bending, flanging, and similar forming operations
• Can be used for welding with appropriate procedures