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小口径焊管因生产工艺不同的分类标准

文章出处:   发布时间:2018-09-12 12:57:14   浏览:37

一般小口径焊管因生产工艺分为热轧小口径焊管和冷拔小口径焊管两种。 热轧小口径焊管分一般钢管,低、中压锅炉钢管,高压锅炉钢管、合金钢管、不锈钢管、石油裂化管、地质钢管和其它钢管等。热轧钢管以热轧状态或热处理状态交货; 热轧小口径焊管生产流程:管坯→加热→穿孔→三辊斜轧、连轧→脱管→定径→冷却→矫直→水压试验→标记→入库,轧制小口径焊管的原料是圆管坯,圆管胚要经过切割机的切割加工成长度约为1米的坯料,并经传送带送到熔炉内加热。管坯被送入熔炉内加热至大约为1200摄氏度。加热管坯燃料为氢气或乙炔。炉内温度控制是关键性的问题,管坯出炉后要经过穿孔机进行穿孔。 一般较常见的穿孔机是锥形辊穿钢管孔机,这种穿孔机生产效率高,产品质量好,穿孔扩径量大,可穿多种钢种。穿孔后,管坯就先后被三辊斜轧、连轧。挤压后要脱管进行定径。定径机通过锥形钻头高速旋转入钢胚打孔,形成钢管(钢管内径由定径机钻头的外径长度来确定)。钢管经定径后,进入冷却塔中,通过喷水冷却,钢管经冷却后,就要被矫直。钢管经矫直后由传送带送至金属探伤机进行内部探伤,若钢管内部有裂纹,气泡等问题,将被探测出。钢管经质检后还要通过严格的手工挑选。钢管质检后,用油漆喷上编号、规格、生产批号等。并由吊车吊入仓库中。

The general small diameter welded pipe is divided into two types: hot rolled small caliber welded pipe and cold drawn small caliber welded pipe. Hot-rolled small-diameter welded pipes are divided into general pipes, low and medium pressure boiler pipes, high pressure boiler pipes, alloy pipes, stainless steel pipes, petroleum cracking pipes, geological pipes and other pipes. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; the production process of hot-rolled small-diameter welded pipes is as follows: tube blank heating perforation three-roll cross-rolling, continuous rolling stripping sizing cooling straightening hydrostatic test marking warehousing. The raw materials for rolling small-diameter welded pipes are round billets, and the tube embryos are cut and processed by cutting machine. The billet with a growth of about 1 meters is heated to the furnace by conveyor belt. The tube billet is heated into a furnace and heated to about 1200 degrees Celsius. Heating the tube billet is hydrogen or acetylene. The temperature control in the furnace is a key problem, and the perforated tube must be perforated after piercing. The common piercing machine is the conical roller piercing machine. This kind of piercing machine has high production efficiency, good product quality, large piercing enlargement and can pierce many kinds of steel. After piercing, the tube blank is successively rolled and rolled by three rolls. After extrusion, the tube must be removed for sizing. The sizing machine rotates the conical drill into the steel embryo at high speed to form a steel pipe (the inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine drill). After sizing, the steel pipe enters the cooling tower and is cooled by spraying water. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal flaw detector by conveyor belt for internal flaw detection. If there are cracks and bubbles in the steel pipe, they will be detected. After the quality inspection, the steel pipe must be selected through strict manual selection. After the quality inspection of the steel pipe, paint numbers, specifications, production batch numbers and so on. The crane is hoisted into the warehouse.

冷拨小口径焊管除分一般钢管、低中压锅炉钢管、高压锅炉钢管、合金钢管、不锈钢管、石油裂化管、其它钢管外,还包括碳素薄壁钢管、合金薄壁钢管、不锈薄壁钢管、异型钢管。冷轧以热处理状态交货。 冷拔小口径焊管生产流程:管坯→加热→穿孔→打头→退火→酸洗→涂油→多道次冷拔→坯管→热处理→矫直→水压试验→标记→入库。冷拔小口径焊管的轧制方法较热轧复杂,它们的生产工艺流程前三步基本相同。不同之处从第四个步骤开始,圆管坯经打空后,要打头,退火。退火后要用专门的酸性液体进行酸洗。酸洗后,涂油。然后紧接着是经过多道次冷拔。热处理后,就要被矫直。钢管经矫直后由传送带送至金属探伤机进行内部探伤,若钢管内部有裂纹,气泡等量问题同样会被挑出来。 从外表看:冷拔小口径焊管长度一般要短于热轧小口径焊管。壁厚方面冷拔小口径焊管要比热轧小口径焊管均匀,热轧管精度低,表面粗糙,而冷拔管精度高一些,表面粗糙度也好一些。

Cold-drawn small-diameter welded pipes are divided into ordinary pipes, low and medium-pressure boiler pipes, high-pressure boiler pipes, alloy pipes, stainless steel pipes, petroleum cracking pipes, and other pipes. They also include carbon thin-walled pipes, alloy thin-walled pipes, stainless steel thin-walled pipes, special-shaped pipes. Cold rolling is delivered in heat treatment. The production process of cold-drawn small-diameter welded pipe is as follows: billet heating perforation tapping annealing pickling oiling multi-pass cold-drawing billet tube heat treatment straightening hydraulic test marking storage. The rolling method of cold-drawn small-diameter welded pipe is more complicated than that of hot-rolled pipe, and the first three steps of their production process are basically the same. The difference starts from the fourth step. After the round billet is emptied, it needs to start and anneal. After annealing, acid acid should be used for pickling. After pickling, oil is applied. Then followed by multiple cold drawing. After heat treatment, it must be straightened. After straightening, the steel pipe is sent to the metal flaw detector by conveyor belt for internal flaw detection. If there is a crack in the steel pipe, the problem of bubbles will also be picked out. Outwardly, the length of cold drawn small caliber welded pipe is usually shorter than that of hot rolled small diameter welded pipe. The wall thickness of cold-drawn small-diameter welded pipe is more uniform than that of hot-rolled small-diameter welded pipe, the precision of hot-rolled pipe is lower, the surface is rough, and the precision of cold-drawn pipe is higher, and the surface roughness is better.

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