、熱軋(ya)(熱擠壓(ya))鋼(gang)管(guan)的直(zhi)徑54～480mm共(gong)(gong)45種(zhong)；壁厚4.5～45mm共(gong)(gong)36種(zhong)。冷(leng)拔(ba)(軋(ya))鋼(gang)管(guan)的直(zhi)徑6～200mm共(gong)(gong)65種(zhong)；壁厚0.5～21mm共(gong)(gong)39種(zhong)。冷(leng)拔(ba)或冷(leng)軋(ya)精密無縫管(guan)（GB3639-83）是(shi)用(yong)于機(ji)械(xie)結構(gou)、液壓(ya)設備的尺寸精度高和(he)表面(mian)光潔(jie)度好的冷(leng)拔(ba)或冷(leng)軋(ya)精密無縫管(guan)。選用(yong)精密無縫管(guan)制造機(ji)械(xie)結構(gou)或液壓(ya)設備等。鋼(gang)管(guan)內外表面(mian)不(bu)(bu)得有裂(lie)縫、折(zhe)疊、龜裂(lie)、裂(lie)紋、軋(ya)折(zhe)、離層和(he)結疤(ba)缺(que)陷(xian)(xian)存在，這些缺(que)陷(xian)(xian)應完(wan)全清除掉(供(gong)機(ji)械(xie)加工(gong)用(yong)管(guan)除外)，清除后不(bu)(bu)得使壁厚和(he)外徑超過(guo)負(fu)偏差。凡不(bu)(bu)超過(guo)允許負(fu)偏差的其他輕(qing)微表面(mian)缺(que)陷(xian)(xian)可不(bu)(bu)清除。

、熱(re)軋(ya)(熱(re)擠壓)鋼(gang)(gang)管(guan)(guan)(guan)的(de)直(zhi)徑54～480mm共45種(zhong)；壁厚(hou)4.5～45mm共36種(zhong)。冷(leng)拔(軋(ya))鋼(gang)(gang)管(guan)(guan)(guan)的(de)直(zhi)徑6～200mm共65種(zhong)；壁厚(hou)0.5～21mm共39種(zhong)。合金無(wu)縫(feng)管(guan)(guan)(guan)的(de)密封性更加好一些(xie)，無(wu)縫(feng)管(guan)(guan)(guan)件，用于(yu)流體輸送管(guan)(guan)(guan)道來說(shuo)是一款的(de)產品，例(li)如(ru)用于(yu)石油、自來水、等(deng)等(deng)這(zhe)些(xie)領(ling)域的(de)管(guan)(guan)(guan)道，需要長(chang)年埋在(zai)地下，則基本(ben)上不(bu)會出現滲漏現象(xiang)，能夠降低(di)資(zi)源的(de)損耗；熱(re)軋(ya)無(wu)縫(feng)鋼(gang)(gang)管(guan)(guan)(guan)主(zhu)要生產工序（主(zhu)要檢(jian)(jian)驗工序）：管(guan)(guan)(guan)坯(pi)準(zhun)備(bei)及檢(jian)(jian)查→管(guan)(guan)(guan)坯(pi)加熱(re)→穿孔→軋(ya)管(guan)(guan)(guan)→荒(huang)管(guan)(guan)(guan)再(zai)加熱(re)→定(ding)（減(jian)）徑→熱(re)處理(li)→成品管(guan)(guan)(guan)矯(jiao)直(zhi)→精整→檢(jian)(jian)驗(無(wu)損、理(li)化、臺檢(jian)(jian)) →入庫

 按(an)GB14975-94《不銹(xiu)鋼無(wu)縫鋼管(guan)(guan)(guan)(guan)(guan)(guan)》規定，鋼管(guan)(guan)(guan)(guan)(guan)(guan)通常長度(du)(不定尺)熱(re)軋(ya)鋼管(guan)(guan)(guan)(guan)(guan)(guan)1.5～10m，熱(re)擠壓鋼管(guan)(guan)(guan)(guan)(guan)(guan)等于和(he)大(da)于1m。冷(leng)拔(ba)(軋(ya))鋼管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)(bi)厚(hou)0.5～1.0mm者，1.0～7m；壁(bi)(bi)厚(hou)大(da)于1.0mm者，不銹(xiu)鋼無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)廠家，1.5～8m。無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)是一種具有(you)中(zhong)空截面、周(zhou)邊沒(mei)有(you)接縫的長條(tiao)鋼材。全(quan)世界生(sheng)產(chan)無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)的共計有(you)110多(duo)個(ge)(ge)國(guo)家的1850多(duo)個(ge)(ge)公司(si)下的5100多(duo)個(ge)(ge)生(sheng)產(chan)廠，304無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)，其(qi)中(zhong)生(sheng)產(chan)石油管(guan)(guan)(guan)(guan)(guan)(guan)的有(you)44個(ge)(ge)國(guo)家的170多(duo)個(ge)(ge)公司(si)下的260多(duo)個(ge)(ge)廠。熱(re)軋(ya)無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)一般在自動軋(ya)管(guan)(guan)(guan)(guan)(guan)(guan)機組上生(sheng)產(chan)。實心管(guan)(guan)(guan)(guan)(guan)(guan)坯經檢查(cha)并清除表面缺(que)陷，安徽(hui)無(wu)縫管(guan)(guan)(guan)(guan)(guan)(guan)，截成所需長度(du)，在管(guan)(guan)(guan)(guan)(guan)(guan)坯穿孔(kong)端(duan)(duan)端(duan)(duan)面上定心，然后送往(wang)加熱(re)爐加熱(re)，在穿孔(kong)機上穿孔(kong)。