We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Straight seam steel pipes have weld seams parallel to their length, characterized by a simple production process, high efficiency, low cost, and rapid development. They are categorized into high-frequency straight seam steel pipes (ERW) and submerged arc welded straight seam steel pipes (LSAW), with the latter further divided into types like UOE, RBE, and JCOE based on their forming methods.
Production Processes of Straight Seam Steel Pipes:
- High-Frequency Welding:
This process uses electromagnetic induction to heat the edges of steel until molten. After rolling, this enables inter-crystal bonding, creating a strong weld without fillers, resulting in minimal spatter and a narrow heat-affected zone. It is widely used due to its high-quality results.
- Submerged Arc Welding:
This method involves using a filler and flux for protection during welding. Capable of producing pipes with diameters up to 1500mm, LSAW processes include JCOE and roll forming. For larger diameters, double-welded (DSAW) pipes may occur.
Acceptance Procedures for ERW and LSAW Pipes:
- Preparation:
Classify, package, and label materials, and verify all accompanying documents before beginning acceptance.
- Appearance Inspection:
Check for surface quality issues like rust, unevenness, or scratches, ensuring surfaces are smooth and free of defects.
- Weld Quality Inspection:
Evaluate both the appearance and internal integrity of welds for issues like rust, cracks, and uniformity.
- Pipe Straightness:
Assess the straightness with tools like rulers or calipers, ensuring deviations meet standards.
- Dimensional Deviation Inspection:
Measure length, diameter, and wall thickness to confirm compliance with specifications.
- Chemical Composition Inspection:
Collect samples and analyze their chemical makeup to verify they meet required standards.
- Mechanical Performance Testing:
Conduct tests on strength, plasticity, toughness, and hardness to ensure the mechanical properties meet standards.
Conclusion:
A thorough acceptance process encompassing appearance, weld quality, straightness, dimensional accuracy, chemical composition, and mechanical properties is essential for ensuring the safety and quality of straight seam steel pipes in various industrial applications.
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