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)采用(yong)1個(ge)(ge)電機(ji)傳(chuan)動，通過(guo)齒(chi)輪箱帶動3個(ge)(ge)軋(ya)輥。雖然軋(ya)輥的速度相同(tong)，但(dan)由于(yu)軋(ya)輥上的負(fu)荷(he)分配不(bu)均。導致軋(ya)制時荒管壁厚(hou)不(bu)均和后(hou)端不(bu)圓(yuan)。由于(yu)尾(wei)三角的原因(yin)，只(zhi)能生產產D／SS不(bu)大于(yu)12的鋼管。

  Assel軋(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)組(zu)(zu)經(jing)過近一(yi)個世(shi)紀的(de)(de)(de)(de)(de)發(fa)展之后，軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)直徑(jing)(jing)不(bu)斷加大(da)(da)(da)(da)。這使得芯(xin)棒(bang)(bang)(bang)(bang)(bang)變得越來(lai)越重。由此而(er)產(chan)生(sheng)(sheng)的(de)(de)(de)(de)(de)問題是(shi)，笨重的(de)(de)(de)(de)(de)芯(xin)棒(bang)(bang)(bang)(bang)(bang)重達數(shu)噸，給芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)操作和運(yun)輸帶來(lai)了很(hen)大(da)(da)(da)(da)困難，并且直接(jie)影響到軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)質量(liang)(liang)(liang)。芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)重量(liang)(liang)(liang)在某種(zhong)程度(du)(du)上制(zhi)(zhi)(zhi)約了大(da)(da)(da)(da)直徑(jing)(jing)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)生(sheng)(sheng)產(chan)。經(jing)過一(yi)段(duan)時(shi)間(jian)(jian)(jian)的(de)(de)(de)(de)(de)摸索之后。當今限(xian)(xian)動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)Assel 軋(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)組(zu)(zu)可以滿(man)足大(da)(da)(da)(da)直徑(jing)(jing)鋼(gang)(gang)管(guan)的(de)(de)(de)(de)(de)生(sheng)(sheng)產(chan)。限(xian)(xian)動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)Assel軋(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)的(de)(de)(de)(de)(de)技術特點(dian)(dian)是(shi)在軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)過程中控(kong)制(zhi)(zhi)(zhi)芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)(du)，使荒(huang)管(guan)的(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)(du)大(da)(da)(da)(da)于芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)前(qian)進(jin)(jin)速度(du)(du)，芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離遠遠小于荒(huang)管(guan)的(de)(de)(de)(de)(de)前(qian)進(jin)(jin)距(ju)離。根(gen)據(ju)限(xian)(xian)動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)上述軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)特點(dian)(dian)，便可根(gen)據(ju)生(sheng)(sheng)產(chan)需要確定芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)長(chang)度(du)(du)，并通過減(jian)(jian)少軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)長(chang)度(du)(du)的(de)(de)(de)(de)(de)方(fang)法來(lai)縮短芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)長(chang)度(du)(du)，從而(er)減(jian)(jian)輕芯(xin)棒(bang)(bang)(bang)(bang)(bang)的(de)(de)(de)(de)(de)重量(liang)(liang)(liang)。對Assel軋(ya)(ya)(ya)(ya)(ya)(ya)管(guan)機(ji)的(de)(de)(de)(de)(de)實驗研(yan)究分析表明(ming)，浮動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)與(yu)限(xian)(xian)動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)之間(jian)(jian)(jian)有(you)很(hen)大(da)(da)(da)(da)差別，相(xiang)比(bi)之下限(xian)(xian)動(dong)芯(xin)棒(bang)(bang)(bang)(bang)(bang)軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)具有(you)更多優點(dian)(dian)：首先，取消(xiao)了荒(huang)管(guan)與(yu)芯(xin)棒(bang)(bang)(bang)(bang)(bang)之間(jian)(jian)(jian)的(de)(de)(de)(de)(de)脫棒(bang)(bang)(bang)(bang)(bang)系(xi)統，不(bu)僅(jin)減(jian)(jian)少了設備的(de)(de)(de)(de)(de)投入，還由于芯(xin)棒(bang)(bang)(bang)(bang)(bang)不(bu)參與(yu)運(yun)輸而(er)使得軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)大(da)(da)(da)(da)直徑(jing)(jing)的(de)(de)(de)(de)(de)鋼(gang)(gang)管(guan)成為可能；其(qi)次，可減(jian)(jian)小附加應力，增大(da)(da)(da)(da)減(jian)(jian)徑(jing)(jing)量(liang)(liang)(liang)，保證了軋(ya)(ya)(ya)(ya)(ya)(ya)制(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)質量(liang)(liang)(liang)。

  大(da)(da)直徑(jing)(jing)Assel軋(ya)管(guan)機(ji)組上(shang)采用(yong)單獨(du)直接傳動。這一(yi)結(jie)構的(de)優點是(shi)，可以(yi)騰出更(geng)多的(de)空間(jian)來(lai)布置出口臺，以(yi)生(sheng)產大(da)(da)直徑(jing)(jing)的(de)鋼管(guan)；可以(yi)用(yong)改變每個軋(ya)輥速(su)度的(de)方法來(lai)補償(chang)由于負(fu)荷分配不(bu)(bu)均(jun)而(er)引(yin)起的(de)軋(ya)制速(su)度的(de)差異，并能補償(chang)軋(ya)輥外徑(jing)(jing)不(bu)(bu)完全相等的(de)差異。軋(ya)輥采用(yong)單獨(du)傳動，并且為軸向出料直接進入定徑(jing)(jing)機(ji)，中間(jian)不(bu)(bu)設(she)置再加熱爐，這些都(dou)是(shi)當今Assel軋(ya)管(guan)機(ji)組的(de)獨(du)特之處。