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Steel pipe production methods
Sources: this site Click: Date: 2014-8-7 2:16:31
1. Hot rolled seamless steel tube
Hot rolled seamless steel tube production process is a solid billet (or ingot) piercing and rolling it into required shape, size and performance of steel pipe.The whole process has three main deformation process:(1) punch - solid billet (ingot) punch into the hollow capillary;
(2) pipe rolling - capillary on the mill rolling into nearly required size tubes;
(3) on reducing - tubes without mandrel rolling into has the required dimensional accuracy and roundness of finished pipe.
In production, according to the conditions such as different varieties, specifications of products and production capacity and choose different types of rolling mill.Due to the different types of mill rolling tube when the kinematics of rolled piece deformation condition, the stress state, passes, the total deformation and productivity is different, so must be equipped with it in the deformation and productivity are matching process before and after the punching machine and other equipment.So that different mill constitute the corresponding pipe rolling unit.Hot-rolled seamless steel tube mill in the production method is to set of types of classification, the common method to hot rolled seamless steel tube production are shown in table 1-1.A specific name of the unit in the unit specification and mill type, such as the phi 168 mm continuous rolling pipe unit is refers to the product of maximum diameter of 168 mm or so, mill unit for continuous rolling mill.Steel tube hot extrusion unit with extrusion press the maximum extrusion (tonnage) or product specification range to represent the model.
2. The welded pipe
Welded steel pipe and welded pipe, its production method is to pipe (steel plate or steel belt) with various forming methods cross-sectional shape bending roll into requirements, and then use different welding method to weld welding process.Forming and welding is its basic process, welded pipe production method is to sort them out according to the characteristics of the two processes.Welded steel pipe production technology is simple, high production efficiency, varieties, specifications, less equipment investment, but the general strength is lower than the seamless steel tube.Since the 1930 s, with the rapid development of high quality strip steel rolling production and the progress of welding and inspection technology, constantly improve the weld quality, increasing varieties of welded steel pipe specifications, and replaced the seamless steel tube in the field of more and more.In the form of welded steel pipe according to the weld seam welded pipe and spiral welded pipe.
Straight seam welded pipe production technology is simple, high production efficiency, low cost, rapid development.The strength of the spiral welded pipe is generally higher than straight seam welded pipe, use a narrow billet production of larger diameter welded pipe, you can also use the same width of billet in the production of different pipe diameter welded pipe.But compared with the same length of straight seam pipe, weld length to increase 30% ~ 100%, and the production efficiency is low.As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded.
3. Cold working steel tube
Cold rolled, cold drawn steel tube cold working method and three kinds of cold spinning, product scope as shown in table 1 and 2.Cold spinning and cold rolled in nature.Cold working can produce smaller than hot rolled product specification of all kinds of precision, thin-walled, high strength and other special performance of seamless steel tube.Such as jet engines with phi 2.032 mm x 0.38 mm high strength heat-resistant tube and phi is 4.763 ~ 31.75 mm x 0.559 ~ 1.626 mm stainless steel pipe.These specifications of the steel tube rolling process is unable to production, so the cold working can adapt to the industry and the rapid development of science and technology more specific needs.The specifications of the cold rolling mill and cold spinning machine with the product specification and the form of a rolling mill;Cold drawing machine specifications with the permissible rated drawing force.Such as LG a 150 represents the finished diameter of 150 mm maximum two high cycle type cold rolling mill;LD - 30 said is finished diameter of more than 30 mm roller mill;LB - 100 represents the drawing force rating of 100 t cold drawn pipe bender.
