Low Temperature Performance
API 5L Grade B pipe has good low temperature toughness, which makes it important for use in cold climates or low temperature environments where brittle fracture of pipes is a major concern.
In general, API 5L Grade B pipe can be used at temperatures as low as -45°C (-49°F) without significant loss of toughness, but for very low temperature applications, additional testing or the selection of low temperature grades may be required.
The ability of a pipe to resist brittle fracture is usually measured by impact tests, such as the simply supported beam V-notch test.
High Temperature Performance
API 5L Grade B pipe can operate efficiently in high temperature environments, generally up to about 250°C (482°F).
When the temperature exceeds 250°C, several factors need to be considered:
Creep: At high temperatures, steel will creep, which is the deformation of the material over time under constant stress. For API 5L Grade B pipe, creep becomes a critical issue above 370°C (698°F).
Reduction in strength: Yield and tensile strengths of materials decrease with increasing temperature, so this reduction in strength must be taken into account when designing high temperature systems.
Oxidation: Increased temperature accelerates the oxidation process, which can lead to increased corrosion rates and reduced service life of the pipe.
API 5L B round carbon steel pipe
