API 5L GR.B Cryogenic Alloy Pipe

API 5L Grade B Cryogenic Alloy Pipe is a specialized carbon-manganese alloy steel pipe designed to perform reliably in cryogenic and ultra-low temperature environments. Manufactured according to the API 5L specification, Grade B pipes engineered with cryogenic alloy enhancements exhibit exceptional toughness, ductility, and resistance to brittle fracture at temperatures well below freezing, making them ideal for LNG, natural gas, and other cryogenic fluid transportation.

Produced using seamless or high-quality welded manufacturing processes, these pipes provide uniform wall thickness and smooth internal surfaces, minimizing stress concentrations and potential weak points. The addition of alloying elements such as nickel and molybdenum improves low-temperature strength and impact resistance, ensuring safe operation in demanding cryogenic applications.

Mechanical properties include:

Minimum yield strength: 245 MPa (35,500 psi)

Minimum tensile strength: 415 MPa (60,000 psi)

Excellent low-temperature toughness and ductility down to -196°C (-321°F)

High resistance to brittle fracture and stress corrosion cracking

Typical applications include:

LNG and natural gas pipelines operating in ultra-low temperatures

Cryogenic storage and distribution systems

Chemical processing plants handling liquefied gases

Offshore and subsea pipelines in cold climates

Industrial applications requiring superior low-temperature performance

API 5L GR.B Cryogenic Alloy Pipes are available in a wide range of diameters and wall thicknesses, tailored to project requirements. Pipe ends can be supplied plain, beveled, or threaded, ensuring compatibility with various welding and installation methods.

Comprehensive quality assurance testing—including hydrostatic pressure testing, ultrasonic and radiographic inspection, Charpy impact tests at cryogenic temperatures, and chemical analysis—ensures compliance with API standards and client specifications. Third-party inspection and certification services are available upon request.

In summary, API 5L Grade B Cryogenic Alloy Pipe offers a reliable, high-performance solution for low-temperature pipeline applications. Its seamless design, alloy-enhanced composition, and proven toughness make it a trusted choice for LNG, natural gas, and other cryogenic fluid transportation in challenging environments.