无缝异型钢管用热轧钢卷为原料，经酸洗去除氧化皮后进行冷连轧，其成品为轧硬卷，由于连续冷变形引起的冷作硬化使轧硬卷的强度、硬度上升、韧塑指标下降，因此冲压性能将恶化，只能用于简单变形的零件。轧硬卷可作为热镀锌厂的原料，因为热镀锌机组均设置有退 火线。轧硬卷重一般在6~13.5吨，钢卷内径为610mm。 Hot-rolled steel coil is used as raw material for cold-drawn steel pipe. The product is rolled coil after removing oxide scale by pickling. The strength, hardness and toughness of rolled coil are increased and the ductility and plasticity index are decreased due to cold work hardening caused by continuous cold deformation. Therefore, the stamping performance will deteriorate and can only be used for parts with simple deformation. The roll can be used as raw material for hot dip galvanizing plant, because the annealing line is equipped with annealing lines. The hard rolling weight is generally 6~13.5 tons, and the inner diameter of the coil is 610mm.
冷拔和热轧两种无缝异型钢管工艺流程概述
Process flow of two seamless steel tubes for cold drawing and hot rolling
冷拔（轧）无缝钢管：圆圆管坯→加热→穿孔→打头→退火→酸洗→涂油（镀铜）→多道次冷拔（冷轧）→坯管→热处理→矫直→水压试验（探伤）→标记→入库。
Cold drawn (rolled) seamless steel tube: round tube blank heating perforation tapping annealing pickling coating (copper) multi-pass cold drawn billet tube heat treatment straightening hydraulic testing marking storage.
热轧（挤压无缝钢管）：圆管坯→加热→穿孔→三辊斜轧、连轧或挤压→脱管→定径（或减径）→冷却→坯管→矫直→水压试验（或探伤）→标记→入库。
Hot-rolled (extruded seamless steel pipe): round billet heating perforation three-roll cross rolling, continuous rolling or extrusion stripping sizing (or reducing) cooling billet tube straightening hydraulic test (or flaw detection) marking storage.
两种钢管工艺流程详解
Two kinds of steel pipe process flow detailed explanation
一般冷连轧板、卷均应经过连续退火（CAPL机组）或罩式炉退火消除冷作硬化及轧制应力，达到相应标准规定的力学性能指标。
Cold work hardening and rolling stress should be eliminated by continuous annealing (CAPL unit) or bell furnace annealing in order to reach the mechanical properties specified in the corresponding standards.
冷轧钢板的表面质量、外观、尺寸精度均优于热轧板，且其产品厚度右轧薄至0.18mm左右，因此深受广大用户青睐。以冷轧钢卷为基板进行产品的深加工，成为高附加值产品。如电镀锌、热镀锌、耐指纹电镀锌、彩涂钢板卷及减振复合钢板、PVC 复膜钢板等，使这些产品具有美观、高抗腐蚀等优良品质，得到了广泛应用。冷轧钢卷经退火后必须进行精整，包括切头、尾、切边、矫平、平整、重卷、或纵剪切板等。冷轧产品广泛应用于汽车制造、家电 产品、仪表开关、建筑、办公家具等行业。钢板捆包后的每包重量为3~5吨。平整分卷重一般为3~10吨/卷。钢卷内径610mm。
The surface quality, appearance and dimensional accuracy of cold-rolled steel sheet are better than those of hot-rolled steel sheet, and the thickness of the product is about 0.18mm by right-rolling, so it is favored by the majority of users. The cold rolled steel coil is used as the base plate for the deep processing of products, and becomes a high value-added product. Such as galvanizing, hot-dip galvanizing, fingerprint-resistant galvanizing, color-coated steel sheet coil, vibration-absorbing composite steel sheet, PVC laminated steel sheet, etc., these products have beautiful, high corrosion resistance and other excellent quality, has been widely used. The cold rolled coil must be fined after annealing, including cutting head, tail, trimming, leveling, leveling, rewinding, or longitudinal shearing plate. Cold rolling products are widely used in automobile manufacturing, household appliances, instrument switches, construction, office furniture and other industries. The weight of each pack is 3~5 tons. The weight of the flat rolling is generally 3~10 tons / volume. Coil inner diameter 610mm.
热轧钢管用连铸板坯或初轧板坯作原料，经步进式加热炉加热，高压水除鳞后进入粗轧机，粗轧料经切头、尾、再进入精轧机，实施计算机 控制轧制，终轧后即经过层流冷却和卷取机卷取、成为直发卷。直发卷的头、尾往往呈舌状及鱼尾状，厚度、 宽度精度较差，边部常存在浪形、折边、塔形等缺陷。其卷重较重、钢卷内径为760mm。(一般制管行业喜欢使用。)将直发卷经切头、 切尾、切边及多道次的矫直、平整等精整线处理后，再切板或重卷，即成为：热轧钢板、平整热轧钢卷、纵切带等产品。热轧精整卷若经酸洗去除氧化皮并涂油后即成热轧酸洗板卷。该产品有局部替代冷轧板的趋向，价格适中，深受广大用户喜爱。
Hot-rolled steel pipes are made of continuous casting slabs or blooming slabs, heated by a walking-beam reheating furnace, descaled by high-pressure water and then entered the roughing mill. The roughing material is cut into the head, tail and then into the finishing mill, which is controlled by a computer. After finishing rolling, it is cooled by laminar flow and coiled by a coiler and becomes a direct-hair coil. The head and tail of straight hair curl are often tongue-shaped and fishtail-shaped, and the accuracy of thickness and width is poor. There are often wave-shaped, folded edge, tower-shaped defects in the edge. The coil weight is heavier and the inner diameter of the coil is 760mm. (general pipe industry likes to use. The direct-hair coil is processed by cutting head, cutting tail, cutting edge, multi-pass straightening, leveling and other finishing lines, and then cut plate or rewinding, that is, hot-rolled steel plate, leveling hot-rolled coil, longitudinal cutting strip and other products. The hot-rolled finishing coil should be pickled to remove the oxide scale and then become the hot rolled pickling coil after finishing the oil. This product has the tendency of partial replacement of cold rolled sheet, and its price is moderate.
