ASTM A671 EFW Steel Pipe
ASTM A671 is a standard for arc-welded (EFW) steel pipes, suitable for pipeline transportation in atmospheric and cryogenic environments. ASTM A671 EFW steel pipes are commonly used in the oil, gas and petrochemical industries, and can also be used in pressure pipeline systems.
1. Manufacturing process
ASTM A671 steel pipes are manufactured by arc welding, welding steel plates or steel strips into pipes, and then heat treating the welds to ensure strength and toughness.
2. Material and grade
Common grades include Class 20, Class 22, etc. These grades distinguish the different mechanical properties of steel pipes and the requirements for heat treatment after welding.
3. Size and specification
Specifications | Value range |
Outer diameter | 16-100 inches (406.4 to -540mm) |
Wall thickness | 6.35mm-50mm |
Length | Usually 6-12m, can be customized according to needs |
Common grades | Class 20, Class 22 |
Working pressure | Determined according to different grades and sizes |
4. Performance requirements
Tensile strength and yield strength vary according to grade.
Impact toughness test can be used for steel pipes used in cryogenic environments.
Pressure test must meet the standard to ensure the reliability and sealing of steel pipes.
5. Application areas
Applicable to oil and gas pipeline transportation.
Industrial fluid transportation pipeline system.
Structural support in low temperature and atmospheric pressure environment.
This type of steel pipe is usually suitable for occasions requiring high pressure resistance and high strength, and specifications and material grades can be customized according to customer needs.
