Production process

Optimize raw material selection: Select high-quality steel strips as raw materials, strictly control their chemical composition, mechanical properties, and surface quality. For example, selecting steel strips with moderate carbon content and reasonable alloy element ratios to ensure that the steel pipes have good strength and toughness; At the same time, it is required that the surface of the steel strip has no obvious defects, such as cracks, folds, rust, etc., to reduce the problems of corrosion and leakage caused by raw material defects during the use of the steel pipe.

Precise control of welding process: Welding is a key process in SSAW Steel Pipe production, which has a significant impact on the quality and service life of the steel pipe. Accurately control welding current, voltage, welding speed and other parameters to ensure good weld formation, without defects such as porosity, slag inclusion, and incomplete penetration. The use of advanced welding equipment and technology, such as multi wire submerged arc welding, can improve welding efficiency and quality, make welds more uniform and dense, thereby enhancing the overall strength and sealing of steel pipes and extending their service life.

Reasonable heat treatment: According to the material and usage requirements of the steel pipe, appropriate heat treatment such as normalizing, tempering, etc. should be carried out. Heat treatment can improve the metallographic structure of steel pipes, eliminate welding stress, and enhance the mechanical properties and corrosion resistance of steel pipes. For example, normalizing treatment can refine the grain size, resulting in better strength and toughness of steel pipes; Tempering treatment can reduce the brittleness of steel pipes, improve their impact resistance and fatigue resistance.

Anti corrosion treatment

Coating with anti-corrosion coating: Coating the surface of steel pipes with anti-corrosion coating is a commonly used and effective anti-corrosion method. Common anti-corrosion coatings include epoxy powder coating, polyethylene coating, polyurethane coating, etc. These coatings have good corrosion resistance, wear resistance, and adhesion, and can form a dense protective film on the surface of steel pipes, isolating them from contact with external corrosive media and slowing down the corrosion rate of steel pipes. When applying anti-corrosion coatings, it is necessary to ensure that the coating thickness is uniform, there are no omissions, no bubbles or other defects, in order to fully exert its anti-corrosion effect.

Cathodic protection: For SSAW steel pipes buried underground or used in highly corrosive media, cathodic protection technology can be used. Cathodic protection is divided into two types: sacrificial anode method and external current method. The sacrificial anode method is to embed metal materials with a more negative potential than the steel pipe around it, such as magnesium alloy, zinc alloy, etc., as sacrificial anodes, which preferentially corrode the sacrificial anodes to protect the steel pipe from corrosion; The external current law applies cathodic current to the steel pipe through an external power source, causing the surface of the steel pipe to be in a cathodic polarization state and suppressing the occurrence of corrosion reactions. Cathodic protection technology can effectively extend the service life of steel pipes in harsh environments.

Installation and maintenance

Correct installation: When installing SSAW steel pipes, it is necessary to strictly follow the installation specifications and operating procedures to ensure that the pipeline connections are firm and well sealed. To avoid additional stress, deformation, or damage to the anti-corrosion coating of the steel pipe caused by improper installation. For example, in the process of pipeline butt welding, it is necessary to ensure that the butt gap is uniform and the misalignment meets the requirements. Suitable welding processes and materials should be used for welding to ensure the quality of the weld seam; During the pipeline laying process, attention should be paid to avoiding collisions between the pipeline and sharp objects to prevent the anti-corrosion coating from being scratched.

Regular inspection and maintenance: Establish a comprehensive pipeline inspection system and regularly inspect and maintain SSAW steel pipes in use. The inspection includes visual inspection of steel pipes, measurement of wall thickness, inspection of anti-corrosion coating condition, non-destructive testing of welds, etc. Through regular inspections, defects such as corrosion, wear, and cracks in steel pipes can be detected in a timely manner, and corresponding repair or replacement measures can be taken according to the severity of the defects. For minor corrosion, wear and other defects, repair, polishing and other methods can be used for repair; For serious defects such as extensive corrosion, deep cracks, etc., damaged steel pipe sections should be replaced in a timely manner to ensure the safe operation of the pipeline.

Control operating parameters: Reasonably control the operating parameters of SSAW steel pipes, such as pressure, temperature, flow rate, etc., to avoid premature damage to the steel pipes due to operating parameters exceeding the design range. For example, in the process of conveying media, it is necessary to strictly control the pressure and flow rate of the media to prevent erosion and wear on the inner wall of the steel pipe due to excessive pressure or flow rate; For steel pipes used in high-temperature environments, their working temperature should be controlled to avoid problems such as reduced strength and increased creep caused by high temperatures.

Environmental management

Improving the usage environment: Minimize the content of corrosive media in the environment where SSAW steel pipes are located. For example, for steel pipes transporting media containing corrosive components, pre-treatment can be carried out before the media enters the pipeline to remove harmful components and reduce the corrosiveness of the media. For buried steel pipes, attention should be paid to avoiding the corrosion effects of factors such as acidity, alkalinity, and moisture content of the surrounding soil. Measures such as soil improvement and drainage can be taken to improve the burial environment of the steel pipes.

Avoid external damage: Protect SSAW steel pipes from external mechanical damage and natural disasters. Set up protective facilities around the steel pipe, such as fences, crash barriers, etc., to avoid collisions between vehicles, construction equipment, etc. and the steel pipe; In earthquake prone areas, seismic design and reinforcement of steel pipes should be carried out to improve their seismic resistance; In coastal areas, it is necessary to consider the seawater corrosion resistance and typhoon resistance of steel pipes, and take corresponding protective measures such as increasing the thickness of anti-corrosion coatings and setting up windproof supports.