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)統的(de)(de)Assel軋管機采(cai)用1個電機傳(chuan)動，通過(guo)齒輪(lun)箱帶動3個軋輥(gun)(gun)。雖然軋輥(gun)(gun)的(de)(de)速度相同，但由于(yu)軋輥(gun)(gun)上的(de)(de)負荷(he)分配不均(jun)。導致軋制(zhi)時荒管壁厚不均(jun)和后端不圓。由于(yu)尾三角的(de)(de)原因，只能生產產D／SS不大(da)于(yu)12的(de)(de)鋼管。

  Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機組經過近一個世(shi)紀的(de)(de)(de)(de)發(fa)展之(zhi)(zhi)后(hou)，軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)的(de)(de)(de)(de)直(zhi)(zhi)徑(jing)(jing)(jing)不(bu)斷(duan)加大(da)(da)。這使(shi)得芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)變得越來(lai)越重(zhong)(zhong)。由此而(er)產(chan)(chan)生的(de)(de)(de)(de)問題是，笨重(zhong)(zhong)的(de)(de)(de)(de)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)重(zhong)(zhong)達數噸，給芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)操作和運(yun)輸(shu)帶來(lai)了很(hen)大(da)(da)困難(nan)，并且直(zhi)(zhi)接影響到(dao)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)鋼(gang)(gang)(gang)管(guan)(guan)(guan)的(de)(de)(de)(de)質(zhi)量(liang)。芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)重(zhong)(zhong)量(liang)在某種程(cheng)(cheng)度(du)(du)上制(zhi)(zhi)(zhi)約了大(da)(da)直(zhi)(zhi)徑(jing)(jing)(jing)鋼(gang)(gang)(gang)管(guan)(guan)(guan)的(de)(de)(de)(de)生產(chan)(chan)。經過一段時間(jian)的(de)(de)(de)(de)摸(mo)索之(zhi)(zhi)后(hou)。當(dang)今限動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)Assel 軋(ya)(ya)(ya)管(guan)(guan)(guan)機組可(ke)以滿足大(da)(da)直(zhi)(zhi)徑(jing)(jing)(jing)鋼(gang)(gang)(gang)管(guan)(guan)(guan)的(de)(de)(de)(de)生產(chan)(chan)。限動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機的(de)(de)(de)(de)技(ji)術特點是在軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)過程(cheng)(cheng)中控制(zhi)(zhi)(zhi)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)(su)度(du)(du)，使(shi)荒(huang)管(guan)(guan)(guan)的(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)(su)度(du)(du)大(da)(da)于芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)前(qian)進(jin)(jin)速(su)(su)度(du)(du)，芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)前(qian)進(jin)(jin)距離(li)遠遠小(xiao)于荒(huang)管(guan)(guan)(guan)的(de)(de)(de)(de)前(qian)進(jin)(jin)距離(li)。根據限動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)上述軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)特點，便(bian)可(ke)根據生產(chan)(chan)需要(yao)確定芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)長度(du)(du)，并通過減(jian)少軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)長度(du)(du)的(de)(de)(de)(de)方(fang)法來(lai)縮短芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)長度(du)(du)，從而(er)減(jian)輕芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)的(de)(de)(de)(de)重(zhong)(zhong)量(liang)。對Assel軋(ya)(ya)(ya)管(guan)(guan)(guan)機的(de)(de)(de)(de)實驗(yan)研究分(fen)析表明，浮動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)與(yu)限動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)之(zhi)(zhi)間(jian)有很(hen)大(da)(da)差別，相比之(zhi)(zhi)下限動(dong)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)具有更多(duo)優點：首先，取(qu)消了荒(huang)管(guan)(guan)(guan)與(yu)芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)之(zhi)(zhi)間(jian)的(de)(de)(de)(de)脫(tuo)棒(bang)(bang)(bang)(bang)系統，不(bu)僅減(jian)少了設(she)備(bei)的(de)(de)(de)(de)投入(ru)，還由于芯(xin)(xin)(xin)棒(bang)(bang)(bang)(bang)不(bu)參與(yu)運(yun)輸(shu)而(er)使(shi)得軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)大(da)(da)直(zhi)(zhi)徑(jing)(jing)(jing)的(de)(de)(de)(de)鋼(gang)(gang)(gang)管(guan)(guan)(guan)成為可(ke)能；其次(ci)，可(ke)減(jian)小(xiao)附(fu)加應力，增大(da)(da)減(jian)徑(jing)(jing)(jing)量(liang)，保證了軋(ya)(ya)(ya)制(zhi)(zhi)(zhi)的(de)(de)(de)(de)質(zhi)量(liang)。

  大直(zhi)(zhi)徑(jing)Assel軋管(guan)機組(zu)上采(cai)用(yong)單獨直(zhi)(zhi)接(jie)傳(chuan)動。這(zhe)一(yi)結構(gou)的優點是(shi)，可以(yi)騰出(chu)更(geng)多的空(kong)間來布(bu)置出(chu)口(kou)臺(tai)，以(yi)生產大直(zhi)(zhi)徑(jing)的鋼管(guan)；可以(yi)用(yong)改變每(mei)個軋輥(gun)速度的方(fang)法來補償由于(yu)負荷(he)分配不均(jun)而(er)引起的軋制速度的差異(yi)，并能(neng)補償軋輥(gun)外(wai)徑(jing)不完全相等的差異(yi)。軋輥(gun)采(cai)用(yong)單獨傳(chuan)動，并且為(wei)軸向出(chu)料(liao)直(zhi)(zhi)接(jie)進入定(ding)徑(jing)機，中(zhong)間不設置再加熱爐，這(zhe)些(xie)都(dou)是(shi)當今Assel軋管(guan)機組(zu)的獨特之處。