Q345B,straight,seam,welded,ste technology Q345B straight seam welded steel pipe
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Level of Q345B steel tube Q345A, is do not impact; Grade Q345B, impact is 20 degrees at room temperature; Grade Q345C, impact is 0 degrees; Q345D grade, is 20 degrees - impact; Q345E level, it is - hit 40 degrees. In the impact of different temperature, impact value is also different. Q345A, Q345B, Q345C Q345D, Q345E. And this is the distinction between grade, represents the main is the impact of different temperature and discussion! The material of Q345B steel pipe is a steel tube. Q represents this kind of material yield, the back of the 345 is refers to the material yield value, in about 345 mpa, and with the increase of the thickness of the material and reduce the yield value. Usually divided into metric welded steel pipe, welded thin-wall tube, transformer cooling pipe and so on. Compared with the spiral welded pipe: strength generally higher than the 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 by 30 ~ 100%, and the production speed is low.Q345b straight seam steel pipe production processQ345b is straight seam steel pipe weld steel tube and steel tube parallel to the longitudinal, Ann production process is divided into high frequency and submerged arc, docking, thermal expansion, etc. High frequency straight seam production of single, mass production cost is low; Double-sided submerged arc flexible production, production of a wide range, at the moment, I the dragon can produce from 325 mm to 1850 mm diameter steel pipe straight steel tube located at the. Of the specifications of the high frequency can be tailor-made production cannot meet the demand. Docking is straight seam steel pipe is made of three roll forming rolled coil pipe, and the production efficiency is low, advantage of random production available, wall thickness, the limitation of specification, usually used in large diameter thick wall pipe fittings production making. Thermal expansion pipe with thick wall is high frequency of original tube pass by medium frequency heating and expanding the production process, make the steel pipe specification required size, high production efficiency, cost is the bottom.Scope of q345b straight seam steel pipe productionQ345B straight seam steel pipe with high frequency, submerged arc, spiral and various methods of production. High frequency pipe diameter can produce range from 76 mm to 600 mm; Submerged arc welding process can produce from 325 mm to 1850 mm; Spiral welded can produce 219-3500 - mm. Straight seam welded pipe production technology is simple, high production efficiency, low cost, rapid development. Q345b straight seam steel pipe application fieldQ345b straight seam steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For liquid transportation, water supply and drainage. For gas, gas, steam, liquefied petroleum gas. For structure: piling pipe, bridge; Dock, road, building structural tube, etc.