Introduction to seamless steel pipe
Introduction to seamless steel pipe
Introduction OF The seamless steel pipe development history:
Seamless steel pipe production has a history of nearly 100 years.
The German Manisman brothers first invented the two-high skew piercing machine in 1885. And invented the periodic pipe roller in 1891. Then in 1903, the Swiss R.C.Stiefel invented the automatic pipe rolling machine (also known as the top pipe rolling machine), and later appeared the continuous pipe rolling machine and pipe pushing machine and other extension machines, beginning to form the modern seamless steel pipe industry.
With the development of modern seamless steel pipe industry, In the 1930s, the variety quality of steel pipe was improved by adopting three-high pipe rolling machine, extruding machine and periodic cold pipe rolling machine. In the 1960s, due to the improvement of continuous pipe rolling machine and the emergence of three-roll perforator, especially the application of tension reducing machine and continuous casting billet success, improve the production efficiency, enhance the seamless pipe and welded pipe competition ability. In the 70’s seamless pipe and welded pipe are abreast, the world steel pipe output at a rate of more than 5% per year.
Since 1953, China has attached great importance to the development of seamless steel pipe industry, and has initially formed a production system for rolling various large, medium and small pipes. Copper pipe is also commonly used ingot cross – rolling perforation, tube mill rolling, coil drawing process.
Use and classification of seamless steel pipe:
Usage:
It is a kind of economic cross-section steel, has a very important position in the national economy, widely used in petroleum, chemical industry, boiler, power station, ship, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and military and other sectors.
Classification:
- Section shape: it is divided into circular section pipe and special-shaped section pipe.
- Material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe
- Connection mode: threaded connection pipe, welded pipe.
- Production method: hot rolling (extrusion, top, expansion) pipe, cold rolling (drawing) pipe
- By use: boiler pipe, oil well pipe, pipeline pipe, structure pipe, chemical fertilizer pipe……
production process:
1.Main production process (main inspection process) of hot rolled seamless steel pipe:
Preparation and inspection of tube blank → heating of tube blank → perforation → Rolling of tube → reheating of tube in waste → fixing (reducing) diameter → heat treatment → straightening of finished pipe → finishing → inspection (non-destructive, physical and chemical, table inspection) → storage.
2. Cold rolled (drawing) seamless steel pipe main production process:
Blank preparation → pickling lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection.
The production process flow chart of hot-rolled seamless steel pipe is as follows:
