Premium 45# seamless, carbon - balanced, tough

specification

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Production process

Raw material preparation
First, make sure that there are raw materials that meet the composition requirements of 45# steel. 45# steel is a high-quality carbon structural steel with a carbon content of about 0.42% - 0.50%. It also contains appropriate amounts of manganese (generally 0.50% - 0.80%), silicon (about 0.17% - 0.37%), sulfur, phosphorus and other impurity elements. Usually, billets or ingots are used as the starting materials for the production of seamless steel pipes. These raw materials must undergo strict inspection to ensure that their chemical composition, impurity content, etc. meet the standards, laying a good foundation for subsequent production.
Heating process
The prepared billets or ingots are sent to the heating furnace for heating. The purpose of heating is to make the steel reach the appropriate rolling temperature for subsequent processing and deformation. Generally speaking, the heating temperature will be set in a suitable range according to the specific characteristics of the steel and the production process requirements, usually around 1000℃ - 1200℃. During the heating process, the heating speed, heating time and uniformity of heating temperature must be strictly controlled to ensure that the steel is heated evenly and avoid local overheating or overcooling, otherwise it may cause uneven performance or defects in the steel.
Rolling process
This is the core link in the production of 45# steel seamless steel pipes. There are mainly two methods: hot rolling and cold rolling, as follows:
Hot rolling
Piercing and rolling: First, the heated billet is pierced by a piercing machine to make the inside of it hollow and form a rough pipe. During the piercing process, the piercing speed, head pressure and other parameters must be controlled to ensure the quality of the rough pipe, such as the inner diameter size accuracy and wall thickness uniformity of the rough pipe.
Extension rolling: The pierced rough pipe is then sent to the extension rolling mill for extension rolling to further reduce the outer diameter of the rough pipe and increase its length, so that it gradually approaches the size specifications of the final finished steel pipe. During the extension rolling process, it is also necessary to accurately control various rolling parameters, such as rolling speed, roller pressure, etc., to ensure the dimensional accuracy and surface quality of the steel pipe.
Cold rolling
Cold rolling is a process of further processing hot-rolled steel pipes at room temperature. It is usually based on the hot-rolled steel pipe, and the steel pipe is rolled again by a cold rolling mill using rollers to further improve the dimensional accuracy, surface finish and mechanical properties of the steel pipe. The cold rolling process requires strict control of parameters such as the number of cold rolling passes and the amount of reduction per pass, because excessive cold rolling may cause defects such as cracks in the steel pipe.
Sizing and straightening
After rolling, the size of the steel pipe may still have a certain deviation, and sizing and straightening are required.
Sizing
The outer diameter of the steel pipe is accurately adjusted by the sizing machine to meet the specified outer diameter size standard. During the sizing process, the parameters such as the roller gap of the sizing machine should be controlled to ensure the accuracy of the outer diameter of the steel pipe, and the general accuracy can reach about ±0.1% - ±0.3%.
Straightening
Straightening is to eliminate the bending deformation of the steel pipe during rolling, sowing, etc. The steel pipe is straightened by a straightening machine to keep the steel pipe straight in the length direction. During the straightening process, the parameters of the straightening machine, such as straightening pressure, should be reasonably adjusted according to the bending degree of the steel pipe to ensure that the straightening effect is good and the straightness of the steel pipe meets the requirements.
Pipe cutting and inspection
After sizing and straightening, the steel pipe basically has the shape of a finished product, but the following operations are still required:
Pipe cutting
According to the customer's requirements or the standard specifications of the product, the steel pipe is cut by a pipe cutting machine to reach the predetermined length. When cutting the pipe, pay attention to the cutting accuracy to ensure that the length of the steel pipe after cutting meets the requirements, and the error is generally controlled within ±5mm.
Inspection
The produced 45# steel seamless steel pipe should be fully inspected to ensure that its quality meets the standards. The inspection content mainly includes:
Chemical composition inspection: reconfirm whether the chemical composition of the steel pipe meets the standard requirements of 45# steel, and detect the content of carbon, manganese, silicon, sulfur, phosphorus and other elements through spectral analysis and other methods.
Dimensional accuracy inspection: Check whether the outer diameter, inner diameter, wall thickness, length and other dimensions of the steel pipe are within the specified standard range, and use calipers, micrometers, length gauges and other tools to measure.
Mechanical property inspection: Test the strength, toughness, hardness and other mechanical property indicators of the steel pipe, obtain relevant data through tensile test, impact test, hardness test and other methods, and compare with the standard.
Surface quality inspection: Check whether there are cracks, scratches, oxide scale and other defects on the surface of the steel pipe, and inspect it through naked eye observation, flaw detector and other equipment.
Only 45# steel seamless steel pipes that have passed the inspection can be sold on the market as finished products or applied to related projects.

Why choose us, our advantages

1. Procurement of high-quality raw materials: Our company always insists on purchasing high-quality raw materials from reliable suppliers and strictly controls the quality of raw materials. We have established long-term and stable cooperative relationships with many well-known suppliers of raw materials such as iron ore and coke, ensuring that each batch of raw materials used meets or even exceeds industry standards, laying a solid foundation for the production of high-quality steel.
2. Advanced production technology and equipment: We have a set of advanced production processes and modern production equipment, which enables us to accurately control key indicators such as the chemical composition, mechanical properties and dimensional accuracy of steel. For example, we use advanced steelmaking technology, such as converter steelmaking combined with refining technology, to effectively remove impurities and improve the purity of steel; equipped with high-precision rolling equipment to ensure that the thickness of steel is uniform and the shape is regular, meeting the strict requirements of different customers for steel quality.
3. Strict quality inspection system: We have established a complete and strict quality inspection system, and every link is carefully inspected from the entry of raw materials to the delivery of finished products. We have a professional quality inspection laboratory equipped with advanced testing instruments, such as spectrometers, universal testing machines, ultrasonic flaw detectors, etc., which can comprehensively test the chemical composition, tensile strength, yield strength, elongation, weld quality (if any) and other indicators of steel. Only steel products that have undergone strict testing and are all qualified will flow into the market, ensuring that every piece of steel that customers get is a fine product.
4. Multi-material coverage: Our product line is rich and diverse, covering a variety of common steel materials, including carbon steel, alloy steel, stainless steel, etc. Whether it is ordinary carbon steel needed for building structures, high-strength alloy steel used in machinery manufacturing, automotive industry and other fields, or stainless steel with extremely high corrosion resistance requirements, customers can find suitable products in our company to meet the diverse needs of different industries and different application scenarios.
5. Outstanding cost-effectiveness: Although we have made great efforts in cost control, we have never sacrificed product quality in exchange for low prices. On the contrary, we provide customers with cost-effective steel products based on high-quality product quality and reasonable pricing strategies. When customers buy our steel, they can enjoy high-quality product guarantees and relatively affordable prices, which truly achieves value for money.
6. Professional sales team: We have a professional sales team that not only knows the various performance and characteristics of steel products, but also has rich industry experience and good communication skills. We can accurately understand customer needs, provide customers with professional product consultation and purchase suggestions, and help customers quickly and accurately select the most suitable steel products for themselves.
7. Perfect after-sales service: We are well aware of the importance of after-sales service to customer satisfaction, so we have established a perfect after-sales service system. We provide product quality assurance and return and exchange services. During the quality assurance period, if there are quality problems with the product, we will promptly handle the return and exchange procedures for customers; provide technical support and consulting services, and provide timely and accurate answers to various problems encountered by customers in the process of using steel, such as application guidance, processing technology suggestions, etc.; at the same time, we provide good logistics and delivery services, track logistics transportation and assist customers in delivery acceptance; we also actively collect customer feedback and handle it in a timely manner, and continuously improve service quality.