Alloy steel tubes are a type of seamless steel tube with superior performance compared to ordinary seamless steel tubes due to their higher content of chromium. They excel in their ability to withstand high and low temperatures, as well as corrosion resistance, which sets them apart from other seamless steel tubes. Consequently, alloy tubes are widely used in industries such as oil, chemicals, power, and boilers. The elements contained in alloy seamless steel tubes include silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, and rare earth elements. Seamless steel tubes (Seamless Steel Tube) are long strips of steel with a hollow cross-section and no seams around the perimeter.

Steel pipes feature hollow sections and are extensively used as pipelines for conveying fluids, such as oil, natural gas, coal gas, water, and certain solid materials. Compared to solid steel materials like round bars, alloy seamless steel pipes, with the same bending and torsional strength, are lighter in weight. They are an economical section steel, widely employed in the manufacture of structural components and mechanical parts, such as oil transportation pipelines, stair railings, bicycle frames, and steel scaffolding used in construction. Manufacturing circular components with alloy seamless steel pipes can enhance material utilization, simplify manufacturing processes, and save on materials and processing time, as seen in items like roller bearing rings and jack sleeves, which are now commonly made using steel pipes. Alloy seamless steel pipes are also indispensable materials for various conventional weapons. Moreover, circular sections distribute stress more evenly when subjected to internal or external radial pressure, hence the vast majority of alloy seamless steel pipes are cylindrical.

A Large Diameter Alloy Steel Pipe Production Technology, A Large Diameter Seamless Alloy Steel Pipe Production Technology.

The process includes the following steps: Step 1, material preparation; Step 2, billet heating and斜轧穿孔; Step 3, rough tube trimming; Step 4, hot expansion and deformation sizing; Step 5, heat treatment; Step 6, straightening; Step 7, internal grinding; Step 8, alignment; Step 9, external grinding; Step 10, non-destructive testing; Step 11, further finishing, final inspection, and packaging. This invention not only enables the production of alloy seamless steel tubes over a wide range of sizes but also requires relatively low investment, high product quality, high production efficiency, and low production costs. The main production process of seamless steel tubes involves billet and billet heating, piercing of the billet, extension of the steel tube, rolling of the steel tube, sizing and reducing of the steel tube, cooling, and finishing, or it can be summarized as the heating, piercing, hot-rolling, pickling, cold drawing, carbon firing, cutting, marking, and packaging of the steel billet into finished products.

A manufacturing method for seamless steel pipes, characterized by: setting up a rolling mill stand with multiple rolling rolls, and continuously configuring multiple mandrel-type seamless pipe rolling mills with mutually different rolling directions. After rolling seamless steel pipes on such a production line, wall thicknesses in the circumferential direction of the rolled pipes are measured at multiple points. Based on the measurement results, at least the positions of the rolling rolls on the rolling stands of the mandrel-type seamless pipe rolling mills are controlled respectively at both ends of each shaft. Shandong Lvhang Steel Pipe Co., Ltd. has been selling large and small diameter seamless steel pipes, high and low-pressure boiler pipes, alloy steel pipes, 16Mn seamless steel pipes, welded steel pipes, 16Mn alloy pipes, geological pipes, cold-drawn steel pipes, petrochemical pipes, precision steel pipes, fluid pipes, stainless steel pipes, and more from major steel mills such as Chengdu Iron and Steel Group, Ye Steel Group, Baotou Steel Plant, Baoshan Iron and Steel Group, Angang Group, Tianjin Da Wujiu, Xining Special Steel Plant, Wuxi Steel Plant, and Hengyang Steel Plant.