確定浙江不銹鋼焊管生產線技術升級和改造的原則，首先要認清焊管產業面臨的形勢特點。第一，經過改革開放以來的持續高速發展，浙江已建立了強大的不(bu)銹鋼(gang)焊管產業，擁有了一大批具有國際先進水平的生產線，機組產能和焊管產量多年來雄居世界第一，產品門類齊全，完全滿足國內管道建設需求；第二，我國制造業產能利用率不足80％，不銹鋼焊接管機組的產能利用率也處于這一水平，有相當一批焊管企業訂單不足，長期虧損，因此，從經濟效益方面考慮，新建生產線已不可取。

從第二章可知(zhi)，浙江現有的7000萬(wan)(wan)噸(dun)不銹鋼焊管(guan)(guan)(guan)(guan)(guan)(guan)(guan)產能中，最多的是(shi)外(wai)徑(jing)φ400mm以下的中小(xiao)直(zhi)徑(jing)高頻焊管(guan)(guan)(guan)(guan)(guan)(guan)(guan)（HFW）機(ji)組，產能約(yue)(yue)(yue)4600萬(wan)(wan)噸(dun)，占(zhan)(zhan)比65％，其主要產品是(shi)一般水(shui)煤氣(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和(he)建(jian)筑用(yong)腳(jiao)手架管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等；管(guan)(guan)(guan)(guan)(guan)(guan)(guan)徑(jing)Φ400mm以上，最大管(guan)(guan)(guan)(guan)(guan)(guan)(guan)徑(jing)ф660mm的HFW焊管(guan)(guan)(guan)(guan)(guan)(guan)(guan)產能約(yue)(yue)(yue)700萬(wan)(wan)噸(dun)，占(zhan)(zhan)比10％，主要用(yong)作城(cheng)市(shi)供(gong)水(shui)、供(gong)熱(re)和(he)供(gong)氣(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)網(wang)，也有少量用(yong)于成品油和(he)天然氣(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道甚(shen)至海底油氣(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道；螺旋埋弧(hu)焊管(guan)(guan)(guan)(guan)(guan)(guan)(guan)機(ji)組產能約(yue)(yue)(yue)1000萬(wan)(wan)噸(dun)，占(zhan)(zhan)比15％，直(zhi)縫埋弧(hu)焊管(guan)(guan)(guan)(guan)(guan)(guan)(guan)機(ji)組產能約(yue)(yue)(yue)700萬(wan)(wan)噸(dun)，占(zhan)(zhan)比10％，一部分高端產品用(yong)于天然氣(qi)長輸管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道，其余用(yong)于城(cheng)市(shi)燃氣(qi)及供(gong)水(shui)、供(gong)熱(re)和(he)供(gong)氣(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)網(wang)。

 浙(zhe)江(jiang)不銹鋼焊(han)(han)管(guan)(guan)產(chan)業面對(dui)不同(tong)目標市場的(de)不同(tong)生產(chan)線應(ying)采取不同(tong)的(de)技術改造策略。我國的(de)小口徑(jing)(jing)HFW 焊(han)(han)管(guan)(guan)早已(yi)實現(xian)了集約化(hua)(hua)生產(chan)，一套(tao)機組專門生產(chan)一種口徑(jing)(jing)鋼管(guan)(guan)，常年(nian)不換道(dao)連續(xu)生產(chan)，這已(yi)經是(shi)比較理(li)想的(de)集約化(hua)(hua)生產(chan)模式，成(cheng)本低，效率高。這些生產(chan)線應(ying)注(zhu)意節能(neng)降耗和環境(jing)保護。而油氣長輸管(guan)(guan)道(dao)（包括海底管(guan)(guan)道(dao)）對(dui)安全要求極高，應(ying)以提(ti)高過程控(kong)制水(shui)平為中心，進一步提(ti)高鋼管(guan)(guan)質(zhi)量(liang)保證能(neng)力(li)和實物質(zhi)量(liang)水(shui)平。