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(chuan)統(tong)的Assel軋(ya)管機(ji)采(cai)用1個電機(ji)傳(chuan)動(dong)，通過齒(chi)輪箱(xiang)帶動(dong)3個軋(ya)輥。雖然軋(ya)輥的速度相同(tong)，但由于(yu)軋(ya)輥上的負(fu)荷分配不(bu)均(jun)。導致軋(ya)制時(shi)荒管壁(bi)厚(hou)不(bu)均(jun)和后(hou)端不(bu)圓。由于(yu)尾三角的原因，只能生產產D／SS不(bu)大于(yu)12的鋼管。

  Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機(ji)組經過(guo)(guo)近(jin)一個(ge)世紀的(de)(de)(de)(de)(de)(de)(de)發展之后(hou)，軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)直徑(jing)不(bu)斷加(jia)大(da)(da)。這使(shi)得芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)變得越來(lai)越重(zhong)。由(you)此而產生(sheng)的(de)(de)(de)(de)(de)(de)(de)問(wen)題是，笨重(zhong)的(de)(de)(de)(de)(de)(de)(de)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)重(zhong)達數噸，給芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)操作和運輸帶來(lai)了(le)(le)很(hen)大(da)(da)困難，并且直接影響到(dao)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)質量。芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)重(zhong)量在某種程度(du)上制(zhi)(zhi)(zhi)(zhi)約了(le)(le)大(da)(da)直徑(jing)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)生(sheng)產。經過(guo)(guo)一段時間(jian)的(de)(de)(de)(de)(de)(de)(de)摸索之后(hou)。當今(jin)限(xian)(xian)動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)Assel 軋(ya)(ya)(ya)管(guan)(guan)(guan)機(ji)組可以滿足大(da)(da)直徑(jing)鋼管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)生(sheng)產。限(xian)(xian)動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機(ji)的(de)(de)(de)(de)(de)(de)(de)技(ji)術特點是在軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)過(guo)(guo)程中控(kong)制(zhi)(zhi)(zhi)(zhi)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)，使(shi)荒管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)大(da)(da)于芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)，芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離遠遠小于荒管(guan)(guan)(guan)的(de)(de)(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離。根(gen)據(ju)限(xian)(xian)動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)上述軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)特點，便可根(gen)據(ju)生(sheng)產需要確定芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)長度(du)，并通過(guo)(guo)減少(shao)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)長度(du)的(de)(de)(de)(de)(de)(de)(de)方法來(lai)縮短芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)長度(du)，從而減輕芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)(de)(de)重(zhong)量。對Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機(ji)的(de)(de)(de)(de)(de)(de)(de)實(shi)驗研究分析表明，浮動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)與限(xian)(xian)動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)之間(jian)有(you)很(hen)大(da)(da)差別，相(xiang)比(bi)之下(xia)限(xian)(xian)動(dong)芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)具有(you)更多優(you)點：首先，取消了(le)(le)荒管(guan)(guan)(guan)與芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)之間(jian)的(de)(de)(de)(de)(de)(de)(de)脫棒(bang)(bang)(bang)(bang)(bang)系統，不(bu)僅減少(shao)了(le)(le)設備的(de)(de)(de)(de)(de)(de)(de)投入，還由(you)于芯(xin)(xin)棒(bang)(bang)(bang)(bang)(bang)不(bu)參與運輸而使(shi)得軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)大(da)(da)直徑(jing)的(de)(de)(de)(de)(de)(de)(de)鋼管(guan)(guan)(guan)成為可能；其次，可減小附加(jia)應力，增大(da)(da)減徑(jing)量，保證了(le)(le)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)(de)(de)質量。

  大直(zhi)(zhi)徑Assel軋(ya)管(guan)機組上采用單獨直(zhi)(zhi)接傳(chuan)動。這一結構的(de)(de)(de)(de)優點是(shi)，可(ke)以(yi)騰出(chu)更(geng)多(duo)的(de)(de)(de)(de)空(kong)間(jian)(jian)來布(bu)置出(chu)口臺，以(yi)生產(chan)大直(zhi)(zhi)徑的(de)(de)(de)(de)鋼管(guan)；可(ke)以(yi)用改變每個(ge)軋(ya)輥(gun)(gun)(gun)速度的(de)(de)(de)(de)方法(fa)來補償由于負荷(he)分配(pei)不均(jun)而引起的(de)(de)(de)(de)軋(ya)制速度的(de)(de)(de)(de)差異，并能(neng)補償軋(ya)輥(gun)(gun)(gun)外徑不完全相(xiang)等的(de)(de)(de)(de)差異。軋(ya)輥(gun)(gun)(gun)采用單獨傳(chuan)動，并且為軸向出(chu)料(liao)直(zhi)(zhi)接進入定徑機，中間(jian)(jian)不設置再加熱爐，這些都是(shi)當今Assel軋(ya)管(guan)機組的(de)(de)(de)(de)獨特之處。