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ASTM A672 LSAW Steel Pipe
ASTM A672 LSAW steel pipe is electric fusion welded (EFW) longitudinal submerged arc welded pipe manufactured from pressure vessel grade steel plate, designed for high-pressure service under moderate elevated temperature.
This specification covers large diameter LSAW pipe widely adopted in power, petrochemical and industrial process piping projects. Brisk Steel Factory manufactures and exports full range ASTM A672 LSAW pipe with complete mill test certificate (MTC), 100% weld radiographic inspection and hydrostatic test.
What is ASTM A672 Standard?
- Grade: defines base plate material & tensile strength (A45, A50, B60, B65, B70, C55, C60, C65, C70)
- Class: defines heat treatment, RT inspection and testing requirements, common CL10, CL11, CL12, CL22, CL32
- Nominal OD starting from 16 inch (DN400), wall thickness up to 75mm
- Weld: EFW with added filler metal, full length weld radiography required for most classes
- Service temperature: -29°C ~ 427°C, focus on high temperature tensile strength and creep resistance
ASTM A672 LSAW Steel Pipe Manufacturing Process
The manufacturing process of ASTM A672 LSAW Steel Pipe is designed to provide consistent dimensional accuracy and controlled weld quality.
1. Steel Plate Selection
The production process begins with pressure-vessel-quality steel plate suitable for the specified ASTM A672 grade.
Before forming, the plate can be checked for:
- Chemical composition
- Mechanical properties
- Plate thickness
- Surface condition
- Material identification
The selected plate grade should correspond to the project design requirements, operating conditions, and applicable ASTM A672 requirements.
2. Plate Forming
The steel plate is formed into a cylindrical shape using controlled forming equipment.
Accurate forming is important because the pipe diameter, roundness, longitudinal seam alignment, and subsequent welding quality are affected by the forming process.
For large-diameter pipe, LSAW/EFW production provides a practical manufacturing route using steel plate rather than relying on seamless production.
3. Longitudinal Electric-Fusion Welding
The formed plate is joined along the longitudinal seam by electric-fusion welding.
The welding process is carefully controlled to achieve the required weld penetration, fusion, alignment, and mechanical properties.
The longitudinal weld is one of the key quality-control areas of ASTM A672 pipe because the finished product is intended for pressure-containing service.
4. Heat Treatment
Heat treatment requirements depend on the specified ASTM A672 grade and class.
Where required, heat treatment is used to obtain the specified material condition and mechanical properties. The applicable treatment should be confirmed against the exact ASTM A672 grade/class combination and purchase specification.
5. Non-Destructive Examination
Non-destructive examination is an important part of pressure-pipe manufacturing.
Depending on the specified class and project requirements, inspection may include:
- Radiographic examination
- Ultrasonic examination
- Weld inspection
- Visual inspection
- Dimensional inspection
The exact NDE requirements should always be confirmed against the ordered ASTM A672 class and project specification.
6. Hydrostatic Testing
Hydrostatic testing can be performed to verify the pressure-containing integrity of the finished pipe.
The test requirements, pressure, duration, and acceptance criteria should follow the applicable ASTM specification and purchase order.
Why Choose ASTM A672 LSAW Steel Pipe?
1. Designed for Pressure Service
The primary advantage of ASTM A672 is its positioning as an electric-fusion-welded pipe for pressure service. The specification combines pressure-vessel-quality plate with controlled manufacturing and testing requirements.
2. Suitable for Large-Diameter Applications
The LSAW/EFW manufacturing method is well suited to large-diameter steel pipe production. This makes ASTM A672 a practical option for projects requiring large-diameter pressure-containing pipe.
3. Pressure-Vessel-Quality Steel Plate
The use of pressure-vessel-quality plate provides a controlled material basis for pressure-service applications. Material selection can be matched to the required grade and operating conditions.
4. Controlled Weld Quality
Longitudinal electric-fusion welding provides a controlled manufacturing process for the pipe seam. Weld inspection and specified NDE help verify the integrity of the finished product.
ASTM A672 LSAW Steel Pipe Applications
ASTM A672 pipe is mainly selected for pressure-service applications where the material and manufacturing requirements of the specification are applicable.
1. High-Pressure Piping
ASTM A672 LSAW Steel Pipe can be used in pressure-containing piping systems where large diameter and controlled welded-pipe manufacturing are required.
2. Power Plant Piping
The pipe may be used for selected pressure piping systems in power generation projects when the material specification and operating conditions are suitable.
3. Industrial Process Piping
Industrial facilities can use ASTM A672 pipe for pressure-containing process piping applications where the specified grade and class meet the engineering requirements.
4. Large-Diameter Pressure Piping
For projects requiring large-diameter welded pressure pipe, ASTM A672 provides a specification-based option using pressure-vessel-quality steel plate.
FAQ
Q: Can black varnish LSAW pipe be used for piling?
A: Both specifications cover electric-fusion-welded steel pipe, but they have different material and service requirements. The appropriate standard should be selected according to the project's temperature, pressure, material, testing, and design requirements.
Q: Can ASTM A672 be supplied as large-diameter LSAW pipe?
A: Yes. The electric-fusion-welded manufacturing method is suitable for large-diameter welded steel pipe. The available diameter and wall thickness should be confirmed according to the specific order requirements.
Q: What tests are performed on ASTM A672 pipe?
A: Testing may include chemical analysis, mechanical testing, weld NDE, hydrostatic testing, dimensional inspection, and other examinations required by the specified grade, class, and purchase specification.
Q: Can ASTM A672 pipe have bevel ends?
A: Yes. Bevel-end preparation can be supplied when required for butt-welding or other project connection requirements. The final bevel configuration should follow the applicable project specification.
Related: LSAW Pipe, ASTM A672 LSAW Pipe
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