如何獲得尺寸更小和質(zhì)量更好的無(wú)縫異型鋼管，必須采用冷軋、冷拔或者兩者聯(lián)合的方法。冷軋通常在二輥式軋機(jī)上進(jìn)行，精密無(wú)縫異型鋼管在變斷面圓孔槽和不動(dòng)的錐形頂頭所組成的環(huán)形孔型中軋制。無(wú)縫異型鋼管通常在0.5～100T的單鏈?zhǔn)交螂p鏈?zhǔn)嚼浒螜C(jī)上進(jìn)行。

In order to obtain seamless special-shaped steel tubes with smaller size and better quality, cold rolling, cold drawing or combination of the two methods must be adopted. Cold rolling is usually carried out on a two-roll mill. Precision seamless special-shaped steel pipe is rolled in an annular pass consisting of a circular groove with variable cross-section and a fixed conical head. Seamless profiled steel pipes are usually carried out on single-chain or double-chain cold-drawing machines of 0.5-100T.

熱軋管一般在自動(dòng)軋管機(jī)組上生產(chǎn)。實(shí)心管坯經(jīng)檢查并清除表面缺陷，截成所需長(zhǎng)度，在管坯穿孔端端面上定心，然后送往熱風(fēng)爐加熱，在穿孔機(jī)上穿孔。在穿孔同時(shí)不斷旋轉(zhuǎn)和前進(jìn)，在軋輥和頂頭的作用下，管坯內(nèi)部逐漸形成空腔，稱焊管。再送至自動(dòng)軋管機(jī)上繼續(xù)軋制。最后經(jīng)均整機(jī)均整壁厚，經(jīng)定徑機(jī)定徑，達(dá)到規(guī)格要求。利用連續(xù)式軋管機(jī)組生產(chǎn)熱軋無(wú)縫異型鋼管是較先進(jìn)的方法。

Hot-rolled pipes are usually produced on automatic pipe rolling mills. The solid billet is checked and cleared of surface defects, cut into the required length, centered on the end face of the billet perforation, then sent to the hot blast stove for heating, and perforated on the perforator. With the continuous rotation and progress of perforation, under the action of rolls and pins, a cavity is gradually formed in the billet, which is called welded pipe. It is then sent to the automatic pipe mill to continue rolling. Finally, the wall thickness of the whole machine is equalized, and the sizing machine is used to calibrate the diameter, which meets the requirements of specifications. It is an advanced method to produce hot-rolled seamless special-shaped steel pipe by continuous pipe rolling mill.

精密無(wú)縫異型鋼管和熱軋管規(guī)格：熱軋管外徑32～630mm。壁厚2.5～75mm。精密無(wú)縫異型鋼管外徑5～200mm，壁厚2.5～12mm。

Specification of precision seamless special-shaped steel pipe and hot-rolled pipe: the outer diameter of hot-rolled pipe is 32-630 mm. The wall thickness ranges from 2.5 mm to 75 mm. Precision seamless special-shaped steel pipe has an outer diameter of 5-200 mm and a wall thickness of 2.5-12 mm.