General seamless steel pipe production process can be divided into two kinds of cold-drawn and hot-rolled, cold-rolled seamless steel pipe production process is generally more complicated than hot-rolled, tube must first conduct a three-roll rolling, after extrusion to be sizing test, if the surface is not responding crack pipe cutter to cut through, cut to a length of about one meter blanks. Then enter the annealing process, annealing use acidic liquid pickling, pickling should pay attention to the surface there is a lot of bubble generation, if a large number of instructions to produce quality steel pipe bubbling reach appropriate standards. Appearance rolled seamless steel pipe seamless steel pipe shorter than hot-rolled, cold-rolled seamless steel pipe wall thickness is generally smaller than hot-rolled seamless steel tubes, but the surface looks much brighter than the thick-walled seamless steel pipe, the surface is not too and more rough, caliber without much glitch. Hot-rolled seamless delivery status generally hot-rolled state after heat treatment delivery. Hot-rolled seamless steel pipe after a rigorous quality control to hand-picked staff, quality inspection after the surface to be coated with oil, then followed by cold drawing multiple experiments to be conducted after hot rolling perforation experiments If the perforation is too large it will be expanding straightening correction. After straightening and then transmitted by the transmitting device to the testing machine for testing experiments, the final labeling, the specifications of which arrangement is placed to the warehouse.
Round tube perforation → → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage seamless steel pipe steel ingot is made of perforated or solid through the capillary tube, and then hot-rolled, cold-rolled or cold call is made. The outer diameter seamless steel pipe specifications
* Wall thickness mm numbers. Hot-rolled and cold rolled seamless steel pipe points (written) seamless steel categories. Hot-rolled seamless steel tube sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, geological steel pipes and other steel pipe. Cold-rolled (allocated) Subject to sub-general seamless steel pipe, low pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, the other steel, but also includes carbon thin-walled steel, alloy thin-walled steel pipe, walled stainless steel, special steel pipe. Hot-rolled seamless pipe diameter is generally greater than 32mm, wall thickness 2.5-200mm, cold-rolled seamless steel pipe diameter can go to 6mm, wall thickness can be 0.25mm, thin-walled tube diameter to 5mm wall thickness of less than 0.25mm, cold high dimensional accuracy than hot-rolled.
Seamless is 10,20,30,35,45 and other high quality carbon steel 16Mn, 5MnV low-alloy structural steel 40Cr, 30CrMnSi, 45Mn2,40MnB and other structural steel hot-rolled or cold-rolled steel. 10,20 and other low-carbon steel seamless pipe is mainly used for fluid pipes. Seamless 45,40Cr etc. made of carbon steel used to manufacture mechanical parts, such as cars, tractors and the force components. General seamless steel pipes to ensure the strength and flattening test. Hot-rolled steel hot-rolled state or heat treatment delivery; cold to hot to heat treatment delivery.
Hot, by definition, high-temperature rolling, the deformation resistance small, can achieve a large amount of deformation. The steel rolling, for example, generally in slab thickness of about 230mm, and after roughing and finishing, final thickness of 1 ~ 20mm. Meanwhile, the plate thickness ratio, dimensional accuracy requirements are relatively low, flatness problem is not prone to control the convexity-based. Requirements for the organization, usually by controlled rolling and cooling to achieve that control the opening and finishing rolling temperature, finish rolling temperature. Round tube perforation → heating → → → annealing → pickling → Heading oiled (copper) → multi-pass cold drawn (cold) → blank tube → heat treatment → straightening → hydrostatic test (testing) → mark → into storehouse
Professional seamless steel pipe manufacturer, Jiangsu Province, Changzhou Tongxing Steel Tube Co., Ltd. is located in the middle of Shanghai-Nanjing Railway and Shanghai-Nanjing Expressway, connecting Beijing-Hangzhou Grand Canal, near State Road 312 through 170 kilometers, the transportation is very convenient, the essence of the plant collection industry, new equipment, complete testing means, strict management measures, the purpose of good service, high-quality staff, the production of seamless steel tubes good supporting role of various instruments for various industries. Here he is said by the specific process of seamless steel bars:
Tube - test - peeling - test - heating - piercing - pickling - grinding - dry lubricant - welding head - cold drawn - solution treatment - Pickling - Pickling passivation - test - cold - to oil - the first cut - dried - in polish - outside polished - testing - identification - product packaging
Industrial pipe flow:
Tube - test - peeling - test - heating - piercing - pickling - Revised mushrooms - dry lubricant - welding head - cold drawn - solution treatment - Pickling - Pickling passivation - test - thermostatic storage - delivery