Seamless tube is a kind of circular, square and rectangular steel with hollow section and no joints around.Seamless steel tube is made of steel ingot or solid tube blank through perforation into capillary, and then by hot rolling, cold rolling or cold rolling.Seamless steel pipe is hollow section, a large number of used for conveying fluid pipe, steel pipe and round steel, compared to solid steel in the bending torsional strength phase at the same time, the weight is lighter, is a kind of economic cross section steel, widely used in the manufacture of structural and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding is used.
A pipe used in large quantities to carry fluids, such as oil, natural gas, gas, water, and certain solid materials.Steel pipe and round steel and other solid steel compared, in the bending and torsion strength at the same time, the weight is lighter, is an economic section of steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drilling pipe, car shaft, bicycle frame and construction of steel scaffolding.
Using steel pipe to make annular parts can improve the material utilization rate, simplify the manufacturing process, and save materials and processing time, such as rolling bearing rings, jack sleeves, etc., which have been widely used to make steel pipe.Steel pipe is also an indispensable material for all kinds of conventional weapons.Steel pipe can be divided into circular pipe and shaped pipe according to the different shape of cross section area.Since the area of the circle is the largest under the condition of equal perimeter, more fluid can be transported through the circular tube.
1. Seamless steel tube is used to manufacture all kinds of low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-wall pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers.Use high quality carbon structural steel hot rolled or cold rolled (dialed) seamless steel tube.It is mainly made of no. 10 and no. 20 steel. In addition to chemical composition and mechanical properties, water pressure test, flanging, flaring and flattening tests are required.Hot rolling shall be delivered in hot rolling condition, and cold rolling (rolling) shall be delivered in heat treatment condition.The inner diameter of steel pipe is determined by the outer diameter length of the drill bit of the sizing machine.
2. After sizing, seamless steel pipe enters the cooling tower and is cooled by water spraying. After cooling, the steel pipe is straightened.After straightening, the steel pipe is sent by conveyor belt to metal flaw detector (or hydraulic test) for internal flaw detection.If there are cracks or bubbles in the steel pipe, they will be detected.
3. After the steel pipe quality inspection, spray the serial number, specification and production batch number with paint.And by the crane into the warehouse.Under the condition of the same cross-sectional area, the steel tube structure with square, flat steel and what kind of steel than the omni-directional bending ability, rigidity is good, because the bending ability of square, flat steel and all kinds of steel have a strong direction, but the steel tube bending performance not only has no direction, but also the unit quality of the strongest bending ability.