無縫異型鋼管用熱軋鋼卷為原料，經(jīng)酸洗去除氧化皮后進(jìn)行冷連軋，其成品為軋硬卷，由于連續(xù)冷變形引起的冷作硬化使軋硬卷的強(qiáng)度、硬度上升、韌塑指標(biāo)下降，因此沖壓性能將惡化，只能用于簡(jiǎn)單變形的零件。軋硬卷可作為熱鍍鋅廠的原料，因?yàn)闊徨冧\機(jī)組均設(shè)置有退 火線。軋硬卷重一般在6~13.5噸，鋼卷內(nèi)徑為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.

冷拔和熱軋兩種無縫異型鋼管工藝流程概述

Process flow of two seamless steel tubes for cold drawing and hot rolling

冷拔（軋）無縫鋼管：圓圓管坯→加熱→穿孔→打頭→退火→酸洗→涂油（鍍銅）→多道次冷拔（冷軋）→坯管→熱處理→矯直→水壓試驗(yàn)（探傷）→標(biāo)記→入庫。

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.

熱軋（擠壓無縫鋼管）：圓管坯→加熱→穿孔→三輥斜軋、連軋或擠壓→脫管→定徑（或減徑）→冷卻→坯管→矯直→水壓試驗(yàn)（或探傷）→標(biāo)記→入庫。

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.

兩種鋼管工藝流程詳解

Two kinds of steel pipe process flow detailed explanation

一般冷連軋板、卷均應(yīng)經(jīng)過連續(xù)退火（CAPL機(jī)組）或罩式爐退火消除冷作硬化及軋制應(yīng)力，達(dá)到相應(yīng)標(biāo)準(zhǔn)規(guī)定的力學(xué)性能指標(biāo)。

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.

冷軋鋼板的表面質(zhì)量、外觀、尺寸精度均優(yōu)于熱軋板，且其產(chǎn)品厚度右軋薄至0.18mm左右，因此深受廣大用戶青睞。以冷軋鋼卷為基板進(jìn)行產(chǎn)品的深加工，成為高附加值產(chǎn)品。如電鍍鋅、熱鍍鋅、耐指紋電鍍鋅、彩涂鋼板卷及減振復(fù)合鋼板、PVC 復(fù)膜鋼板等，使這些產(chǎn)品具有美觀、高抗腐蝕等優(yōu)良品質(zhì)，得到了廣泛應(yīng)用。冷軋鋼卷經(jīng)退火后必須進(jìn)行精整，包括切頭、尾、切邊、矯平、平整、重卷、或縱剪切板等。冷軋產(chǎn)品廣泛應(yīng)用于汽車制造、家電 產(chǎn)品、儀表開關(guān)、建筑、辦公家具等行業(yè)。鋼板捆包后的每包重量為3~5噸。平整分卷重一般為3~10噸/卷。鋼卷內(nèi)徑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.

熱軋鋼管用連鑄板坯或初軋板坯作原料，經(jīng)步進(jìn)式加熱爐加熱，高壓水除鱗后進(jìn)入粗軋機(jī)，粗軋料經(jīng)切頭、尾、再進(jìn)入精軋機(jī)，實(shí)施計(jì)算機(jī) 控制軋制，終軋后即經(jīng)過層流冷卻和卷取機(jī)卷取、成為直發(fā)卷。直發(fā)卷的頭、尾往往呈舌狀及魚尾狀，厚度、 寬度精度較差，邊部常存在浪形、折邊、塔形等缺陷。其卷重較重、鋼卷內(nèi)徑為760mm。(一般制管行業(yè)喜歡使用。)將直發(fā)卷經(jīng)切頭、 切尾、切邊及多道次的矯直、平整等精整線處理后，再切板或重卷，即成為：熱軋鋼板、平整熱軋鋼卷、縱切帶等產(chǎn)品。熱軋精整卷若經(jīng)酸洗去除氧化皮并涂油后即成熱軋酸洗板卷。該產(chǎn)品有局部替代冷軋板的趨向，價(jià)格適中，深受廣大用戶喜愛。

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.