我國從1985年開始該機組的引進，洪都鋼管廠是第一個建設該機組的工廠。引進的是改進型的全浮動三輥軋管機，產品規格范圍從Φ63～80mm。

  所謂的改進型三輥軋管機。其結構上的區別在軋管機入口端的輥頸軸承裝在活動牌坊上，活動牌坊與一液壓缸相連。啟動液壓缸可按要求快速改變軋輥的喂人角。因為軋制薄壁管的主要問題在毛管的尾端，改進型三輥軋管機的解決辦法是在毛管尾端產生一小段壁厚較厚的毛管，以便給相鄰的薄壁管以足夠的支撐。這種解決辦法是這樣實現的。開始時，軋機的喂入角調整得較小，當毛管前端通過軋輥后，迅速將喂入角調大，然后，當軋至毛管后端時，又重新快速將喂人角調小。由于軋輥軸安裝的幾何關系，減小軋機喂入角不僅改變喂入效率，而且可打開輥喉，所以就產生一小段厚壁管。

  傳統的(de)Assel軋管機采用1個電機傳動(dong)，通過齒輪箱帶(dai)動(dong)3個軋輥。雖(sui)然軋輥的(de)速度相同，但由于軋輥上的(de)負荷分配不均。導致軋制(zhi)時荒管壁厚不均和后端不圓。由于尾三(san)角的(de)原因，只能生(sheng)產產D／SS不大于12的(de)鋼管。

  Assel軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)組經(jing)過近一(yi)個世紀的(de)(de)(de)(de)(de)(de)(de)發展之(zhi)后，軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)(de)(de)直(zhi)(zhi)徑(jing)(jing)不斷加大(da)(da)。這(zhe)使得芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)變得越來(lai)越重。由此而(er)產(chan)生的(de)(de)(de)(de)(de)(de)(de)問題是(shi)，笨重的(de)(de)(de)(de)(de)(de)(de)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)重達數噸，給芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)操作和(he)運輸(shu)帶來(lai)了(le)很(hen)大(da)(da)困難(nan)，并且直(zhi)(zhi)接影響到軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)(de)(de)質(zhi)量(liang)。芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)重量(liang)在(zai)某種程(cheng)度上制(zhi)(zhi)約了(le)大(da)(da)直(zhi)(zhi)徑(jing)(jing)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)(de)(de)生產(chan)。經(jing)過一(yi)段(duan)時間(jian)的(de)(de)(de)(de)(de)(de)(de)摸索之(zhi)后。當(dang)今限(xian)(xian)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)Assel 軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)組可(ke)(ke)以(yi)滿足大(da)(da)直(zhi)(zhi)徑(jing)(jing)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)(de)(de)生產(chan)。限(xian)(xian)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)Assel軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)的(de)(de)(de)(de)(de)(de)(de)技術特點是(shi)在(zai)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)過程(cheng)中控(kong)制(zhi)(zhi)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)度，使荒管(guan)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)度大(da)(da)于芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)度，芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離(li)遠遠小(xiao)于荒管(guan)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離(li)。根(gen)據(ju)限(xian)(xian)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)上述軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)特點，便(bian)可(ke)(ke)根(gen)據(ju)生產(chan)需(xu)要確定芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)長(chang)度，并通過減(jian)(jian)少軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)長(chang)度的(de)(de)(de)(de)(de)(de)(de)方法來(lai)縮短芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)長(chang)度，從而(er)減(jian)(jian)輕(qing)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)重量(liang)。對Assel軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)的(de)(de)(de)(de)(de)(de)(de)實驗研(yan)究分析表明(ming)，浮(fu)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)與限(xian)(xian)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)之(zhi)間(jian)有很(hen)大(da)(da)差別，相比之(zhi)下(xia)限(xian)(xian)動(dong)芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)具(ju)有更多優點：首先，取消了(le)荒管(guan)與芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)之(zhi)間(jian)的(de)(de)(de)(de)(de)(de)(de)脫棒(bang)(bang)(bang)(bang)系(xi)統，不僅(jin)減(jian)(jian)少了(le)設備的(de)(de)(de)(de)(de)(de)(de)投入，還(huan)由于芯(xin)(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)不參與運輸(shu)而(er)使得軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)大(da)(da)直(zhi)(zhi)徑(jing)(jing)的(de)(de)(de)(de)(de)(de)(de)鋼(gang)(gang)管(guan)成為(wei)可(ke)(ke)能(neng)；其次，可(ke)(ke)減(jian)(jian)小(xiao)附(fu)加應力，增大(da)(da)減(jian)(jian)徑(jing)(jing)量(liang)，保證(zheng)了(le)軋(ya)(ya)(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)質(zhi)量(liang)。

  大直(zhi)徑(jing)Assel軋(ya)管(guan)(guan)機(ji)組(zu)上采用單(dan)獨直(zhi)接(jie)傳(chuan)動。這一結構的優點是(shi)，可以騰出更多的空間來布置(zhi)(zhi)出口(kou)臺，以生產大直(zhi)徑(jing)的鋼管(guan)(guan)；可以用改變(bian)每個(ge)軋(ya)輥(gun)速度的方法(fa)來補(bu)償由(you)于負荷分配不均而引起的軋(ya)制速度的差異，并能(neng)補(bu)償軋(ya)輥(gun)外(wai)徑(jing)不完全相等(deng)的差異。軋(ya)輥(gun)采用單(dan)獨傳(chuan)動，并且為軸向出料直(zhi)接(jie)進入定(ding)徑(jing)機(ji)，中間不設置(zhi)(zhi)再加(jia)熱(re)爐，這些都是(shi)當今(jin)Assel軋(ya)管(guan)(guan)機(ji)組(zu)的獨特之處。