Manufacturing

1. Uncoiling and Straightening: Our carefully-selected top-quality steel plates undergo precision straightening using advanced straightening machines to ensure they are flat and straight, providing a solid foundation for subsequent forming and welding processes.

2. Forming: Under the action of the forming machine, the steel plates pass through multiple passes of forming rollers, gradually taking on a tube shape. It is crucial to control the spacing and speed of the rollers during the molding process to ensure the accuracy of the tube diameter and wall thickness.

3. Internal and External Welding: We utilize advanced submerged arc welding machines and double-sided welding machines to achieve welding on both the inner and outer sides of the pipes. During the welding process, specialized equipment and automatic tracking systems ensure the quality of the welds.

4. Pipe Cutting: Upon completion of the welding process, the pipes are accurately cut using plasma technology according to the specified size, ensuring precision and uniformity.

5. Inspection: Advanced technical means such as ultrasonic flaw detectors and X-ray inspection equipment are employed to comprehensively inspect the welds, ensuring their quality. In the event of any defect, timely repair and welding are carried out until each welded pipe meets the required standard.

6. Pipe End Processing: The spiral welded pipe undergoes cleaning using a specialized machine to remove oil stains and impurities from the surface. An anti-corrosion treatment is then applied using spraying equipment to provide long-term and effective protection for the welded pipes, resulting in the production of high-quality spiral welded pipes.

1. Billet Preparation: This process involves inspecting the surface quality of the billet and eliminating any defects. Shot blasting is utilized to remove any scale from the surface. Additionally, magnet particle testing and visual inspection are employed to identify and remove any defects using a grinder. Internal quality assurance measures such as ultrasonic testing, dimension and geometry checking are also applied.

2. Preheating: The temperature and duration of reheating within the furnace are tailored based on the intended use of the product. To prevent decarburization, which can impact the surface quality of the product, the billet is preheated adequately at a low temperature before undergoing rolling in the reheating furnace. Strict control over the fuel and air ratio is maintained for this purpose.

3. Rolling: The temperature, draft, and speed of deformation during the rolling process are managed to meet specific customer requirements for material properties. Additional measures to ensure surface quality include adjusting roll roughness and gap, detecting any cracks, and correcting dimensions.

4. Cooling: The coiling temperature at the laying head, the air flow and movement speed of the blower on the cooling bed, and the cooling speed of the insulation cover are meticulously controlled to ensure that the product possesses the necessary features for each application. High carbon steel wire rods undergo rapid cooling to achieve the required microstructure for successful drawing, while low carbon steel undergoes slow cooling to ensure the desired softness, eliminating the need for an annealing process.

5. Inspection: Samples are extracted from the front and rear edges of the product after rolling and cooling for testing to identify any defects in dimension, surface, or material integrity. Additionally, packaging and tagging are inspected in accordance with customer requirements prior to shipping.

1. Heating: The forging process begins with metal blocks known as “ingots,” which come in various shapes and sizes depending on the part or component to be produced. These ingots are heated to a near-molten state, allowing the metal to retain its shape while being easily manipulated with force.

2. Preforming: The heated ingot is then edged and blocked using a press or hammer to prepare it for pressing between closed dies. Edging increases the working cross-section, while blocking refines the shape in preparation for finish forging.

3. Finish Forging: The preformed metal is forced into an impression between two dies to achieve the general shape of the final product. While simple items may require only one press, more complex items may need multiple strokes at different pressures or different dies to achieve the desired design.

4. Cooling: By carefully controlling the cooling process, forgers can enhance the strength of the final product by deforming and optimizing the grain flow within the metal. An important aspect of impression die forging is the “flash,” which is the excess metal that flows outside the dies. The flash cools and hardens rapidly, becoming stronger than the metal within the dies, ensuring complete filling of any cavities.

5. Finishing: After forging, trimming and other surface treatment operations are performed to improve the dimensional accuracy of the forged product. Surface treatments can also be applied to enhance corrosion resistance and improve the appearance of the finished product.

1. Rolling: Our 4-high reversible finishing mill, with a maximum load of 7000 tons, ensures minimal internal defects even in thick plates. The implementation of automatic gauge control and shape control systems not only reduces thickness deviation but also enhances plate flatness, ensuring superior quality.

2. Cooling: Our advanced cooling system enables the production of high-strength steel without the need for heat treatment, achieved through rolling and accelerated cooling. Utilizing the mist cooling method with a suction type, our system boasts high cooling capacity and maintains a uniform temperature gradient in the widthwise direction, effectively reducing plate quality deviation.

3. Hot Leveling: The hot leveler is instrumental in producing superior quality flat plates by eliminating residual stress left on rolled plates, ensuring exceptional flatness and uniformity.

4. Slitting: Following the cooling process, the plates undergo meticulous dimensional accuracy inspection and are then cut into the appropriate width and length based on plate grade and thickness. This is carried out using either a mechanical shearing machine or flame planner, with production conditions tailored to factors such as the air knife gap and the nozzle size of the gas torch to achieve a higher degree of dimensional accuracy.

5. Heat Treatment: To meet the structural demands of our customers, plates undergo heat treatment after scale removal by shot blasters. Our non-oxidizing radiation tube type heat treating facilities produce scale-free heat-treated plates, ensuring the desired plate structure.

6. Ultrasonic Tester Checks: Our ultrasonic tester meticulously checks for blow holes, pipes, laminations, and other internal defects to guarantee the internal quality of plates demanded by our customers, ensuring the highest standards of quality and reliability.