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The Whole Process of Hot Rolled Seamless Steel Tube Production

May. 30, 2020

Brief introduction of seamless steel tube

Seamless Steel Pipe is a round, square, rectangular steel with a hollow cross-section and no joints around. Seamless steel tubes are made of steel ingots or solid tube blanks through perforations to form capillary tubes, which are then hot rolled, cold rolled or cold dialed. The seamless steel pipe has a hollow cross-section and is widely used as a pipeline for conveying fluid. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength are the same, and it is economic cross-section steel. Parts and mechanical parts, such as steel scaffolding for petroleum drills.

Oil line seamless steel pipe development history

Seamless steel pipe production has a history of nearly 100 years. The German Mannesmann brothers first invented the two-roll oblique rolling piercer in 1885, the cycle pipe rolling the machine was invented in 1891, and the automatic pipe rolling machine (also known as the head rolling) was invented by the Swiss Rstetie in 1903 Tube machine), and later, various continuous rolling mills, pipe jacking machines, and other extension machines appeared, and began to form a modern seamless steel pipe industry. In the 1930s, the use of three-roll tube mills, extruders, and periodic cold tube mills improved the quality of steel tubes. In the 1960s, due to the improvement of the continuous rolling mill, the emergence of the three-roller piercer, especially the success of the application of the tension reducer and the continuous casting billet, improved the production efficiency and enhanced the ability of the seamless pipe to compete with the welded pipe. In the 1970s, seamless pipes and welded pipes were going hand in hand, and the world's steel pipe production increased at an annual rate of more than 5%. After 1953, China attached great importance to the development of a seamless steel pipe industry and has initially formed a production system for rolling various large, medium, and small pipe materials. Copper tubes are also generally used in ingot billet oblique rolling and perforation, tube rolling machine rolling, and coil drawing process.

Black Color Seamless Steel Pipe

Black Color Seamless Steel Pipe

The use and classification of Black Color Seamless Steel Pipe

Uses: Seamless steel pipe is an economic section of steel, which has a very important position in the national economy. It is widely used in petroleum, chemical industry, boilers, power stations, ships, machinery manufacturing, automobiles, aviation, aerospace, energy, geology, construction and Military, and other departments.


①According to the cross-sectional shape: round cross-section tube, special-shaped cross-section tube ②According to the material: carbon steel tube, alloy steel tube, stainless steel tube, composite tube ③According to the connection method: threaded connection tube, welding tube ④According to the production method: hot rolling (Squeeze, jack, expand) pipes, cold-rolled (pulled) pipes ⑤ According to usage: boiler pipes, oil well pipes, pipeline pipes, structural pipes, fertilizer pipes ...

Seamless steel pipe production process

①Main production process of hot-rolled seamless steel tubes (main inspection process):

Tube blank preparation and inspection → tube blank heating → perforation → rolling tube → barren tube reheating → fixed (reduced) diameter → heat treatment → straightening of finished tube → finishing → inspection (non-destructive, physical and chemical, Taiwan inspection) → storage

②Main production process of cold-rolled (drawn) seamless steel pipe

Billet preparation → pickling lubrication → cold rolling (pulling) → heat treatment → straightening → finishing → inspection