The raw materials used in the production of LSAW (Longitudinal Submerged Arc Welding) steel pipes primarily include steel plates or coils.

Key raw material requirements for LSAW Steel Pipes

1. Steel Plates/Coils:

- Steel plates or coils serve as the primary raw material for manufacturing LSAW steel pipes.

- The plates or coils are typically made of carbon steel, low alloy steel, or high-strength steel, depending on the specific application and requirements.

- The steel plates or coils should meet relevant international or industry standards, such as ASTM, API, EN, or DIN, to ensure the desired mechanical properties and quality of the pipes.

- The chemical composition of the steel should be suitable for the intended application, with specific considerations for elements such as carbon, manganese, silicon, sulfur, phosphorus, and alloying elements (if applicable).

- The steel material should have good weldability to facilitate the welding process during pipe production.

- The plates or coils should undergo rigorous quality control procedures to ensure they meet the required specifications for dimensions, surface quality, and mechanical properties.

2. Flux and Welding Wire:

- Submerged arc welding, which is commonly used in LSAW Pipe production, requires the use of flux and welding wire.

- The flux is a granular material that forms a protective layer over the welding arc, shielding it from impurities and facilitating a high-quality weld.

- The welding wire is used as the filler material to join the edges of the steel plates during the welding process.

- Both the flux and welding wire should be selected based on the specific welding process, steel grade, and project requirements.

It's important to note that the specific raw material requirements for LSAW steel pipes may vary depending on factors such as pipe diameter, wall thickness, steel grade, and project specifications. Manufacturers should carefully select the appropriate raw materials and ensure they meet the required standards and specifications to produce high-quality LSAW steel pipes.

LSAW (Longitudinal Submerged Arc Welding) steel pipes are manufactured using a specific production process that involves several steps.

An overview of the production process of LSAW steel pipes

1. Plate Preparation:

- The process begins with the preparation of steel plates that will be used to form the pipe.

- The plates undergo inspection for quality control, including checks for dimensions, surface defects, and chemical composition.

- The plates are then trimmed or cut to the required size and shape.

2. Forming:

- The trimmed plates are fed into a forming machine, which bends the plates into a U-shape or a "U-O" shape.

- The edges of the U-shaped plates are then prepared for welding.

3. Pre-Welding:

- The prepared edges of the U-shaped plates are tack-welded together using automatic or manual welding methods.

- This tack welding ensures that the plates maintain their proper alignment during the subsequent welding process.

4. Inside and Outside Welding:

- The tack-welded U-shaped plates are passed through a series of welding rollers or bending rolls.

- The rollers apply pressure to bring the edges of the plates into close contact, forming a continuous steel tube.

- A high-intensity electrical current is then applied using the submerged arc welding method.

- The welding arc is submerged beneath a layer of granular flux, which shields the arc and protects the weld from impurities.

- The welding process continues as the pipe moves forward, resulting in a longitudinal welded joint both on the inside and outside of the pipe.

5. Ultrasonic Testing:

- After the welding process, the LSAW pipe undergoes ultrasonic testing to detect any defects or imperfections in the weld.

- Ultrasonic waves are transmitted through the pipe, and the reflected waves are analyzed to identify any discontinuities, such as cracks or voids.

6. Pipe Expanding and Sizing:

- The welded pipe may undergo pipe expansion to achieve the required dimensions.

- Hydraulic presses or other equipment are used to expand the pipe diameter and adjust its roundness and wall thickness.

7. Final Inspection and Coating:

- The LSAW pipe undergoes a final inspection to ensure it meets the specified requirements for dimensions, quality, and surface finish.

- Depending on the application, the pipe may undergo additional processes such as anti-corrosion coating, lining, or painting.

8. Delivery:

- The completed LSAW steel pipes are ready for packaging and transportation to their intended destinations.

It's important to note that specific details of the LSAW steel pipe production process may vary depending on factors such as pipe diameter, wall thickness, steel grade, and project specifications. The process described above provides a general overview of the typical steps involved in manufacturing LSAW steel pipes.