厚壁鋼管在我國鋼管業中具有重要的地位,據不完全統計,我國現有厚壁鋼管生產企業約240多家,鋼管機組約250多套,年產能力約450多萬噸。從口徑看,厚壁鋼管15萬噸,占4.3%;不銹管、軸承管、汽車管共5萬噸,占1.4%。
軋(ya)(ya)制厚壁鋼(gang)(gang)(gang)管(guan)(guan)的原(yuan)料是圓管(guan)(guan)坯(pi),圓管(guan)(guan)胚要經(jing)(jing)過切(qie)割(ge)機(ji)(ji)(ji)的切(qie)割(ge)加(jia)工(gong)成(cheng)長度約為1米(mi)的坯(pi)料,并(bing)(bing)經(jing)(jing)傳(chuan)送(song)(song)帶送(song)(song)到熔爐(lu)內(nei)加(jia)熱。鋼(gang)(gang)(gang)坯(pi)被(bei)(bei)送(song)(song)入(ru)熔爐(lu)內(nei)加(jia)熱,溫度大約為1200℃。燃料為氫氣或(huo)乙炔。爐(lu)內(nei)溫度控制是關鍵性的問題.圓管(guan)(guan)坯(pi)出(chu)爐(lu)后(hou)(hou)(hou)要經(jing)(jing)過壓力(li)穿孔(kong)機(ji)(ji)(ji)進(jin)行穿空。一(yi)般較常見的穿孔(kong)機(ji)(ji)(ji)是錐形輥穿孔(kong)機(ji)(ji)(ji),這種穿孔(kong)機(ji)(ji)(ji)生(sheng)產效率高,產品質(zhi)量好,穿孔(kong)擴徑(jing)(jing)量大,可(ke)穿多種鋼(gang)(gang)(gang)種。穿孔(kong)后(hou)(hou)(hou),圓管(guan)(guan)坯(pi)就(jiu)先后(hou)(hou)(hou)被(bei)(bei)三輥斜軋(ya)(ya)、連軋(ya)(ya)或(huo)擠壓。擠壓后(hou)(hou)(hou)要脫管(guan)(guan)定(ding)徑(jing)(jing)。定(ding)徑(jing)(jing)機(ji)(ji)(ji)通過錐形鉆頭高速(su)旋轉(zhuan)入(ru)鋼(gang)(gang)(gang)胚打(da)孔(kong),形成(cheng)鋼(gang)(gang)(gang)管(guan)(guan)。鋼(gang)(gang)(gang)管(guan)(guan)內(nei)徑(jing)(jing)由定(ding)徑(jing)(jing)機(ji)(ji)(ji)鉆頭的外徑(jing)(jing)長度來確定(ding)。鋼(gang)(gang)(gang)管(guan)(guan)經(jing)(jing)定(ding)徑(jing)(jing)后(hou)(hou)(hou),進(jin)入(ru)冷(leng)卻(que)塔中,通過噴水冷(leng)卻(que),鋼(gang)(gang)(gang)管(guan)(guan)經(jing)(jing)冷(leng)卻(que)后(hou)(hou)(hou),就(jiu)要被(bei)(bei)矯直(zhi)。鋼(gang)(gang)(gang)管(guan)(guan)經(jing)(jing)矯直(zhi)后(hou)(hou)(hou)由傳(chuan)送(song)(song)帶送(song)(song)至(zhi)金屬探傷(shang)(shang)機(ji)(ji)(ji)(或(huo)水壓實驗)進(jin)行內(nei)部探傷(shang)(shang)。若鋼(gang)(gang)(gang)管(guan)(guan)內(nei)部有裂(lie)紋,氣泡等問題,將被(bei)(bei)探測出(chu)。鋼(gang)(gang)(gang)管(guan)(guan)質(zhi)檢(jian)后(hou)(hou)(hou)還要通過嚴格的手工(gong)挑(tiao)選(xuan)。鋼(gang)(gang)(gang)管(guan)(guan)質(zhi)檢(jian)后(hou)(hou)(hou),用油漆噴上編(bian)號(hao)、規格、生(sheng)產批號(hao)等。并(bing)(bing)由吊(diao)車吊(diao)入(ru)倉庫中。
規(gui)格(ge):厚壁鋼管的規(gui)格(ge)用(yong)外(wai)徑(jing)*壁厚毫米數表(biao)示。
厚壁鋼管(guan)的分類(lei):鋼管(guan)分熱軋和冷軋(撥)無縫鋼管(guan)兩類(lei)。
厚壁(bi)鋼(gang)(gang)管(guan)(guan)分一般鋼(gang)(gang)管(guan)(guan),低、中(zhong)壓(ya)鍋爐鋼(gang)(gang)管(guan)(guan),高(gao)壓(ya)鍋爐鋼(gang)(gang)管(guan)(guan)、合金鋼(gang)(gang)管(guan)(guan)、不銹鋼(gang)(gang)管(guan)(guan)、石油裂(lie)化管(guan)(guan)、地質(zhi)鋼(gang)(gang)管(guan)(guan)和其它鋼(gang)(gang)管(guan)(guan)等。
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