北京q345b方管(guan)價格

　　隨著(zhu)優質q345b方管(guan)(guan)(guan)(guan)連軋生(sheng)產的(de)(de)(de)迅速(su)發展以及焊(han)接(jie)和檢驗技術的(de)(de)(de)進步，焊(han)縫質量不斷提高(gao)(gao)，焊(han)接(jie)鋼管(guan)(guan)(guan)(guan)的(de)(de)(de)品種(zhong)規格日益增(zeng)多(duo)，并在(zai)越來越多(duo)的(de)(de)(de)領域代替(ti)了無縫鋼管(guan)(guan)(guan)(guan)。焊(han)接(jie)鋼管(guan)(guan)(guan)(guan)按(an) 焊(han)縫的(de)(de)(de)形式分(fen)為直(zhi)(zhi)(zhi)縫焊(han)管(guan)(guan)(guan)(guan)和方管(guan)(guan)(guan)(guan)。直(zhi)(zhi)(zhi)縫焊(han)管(guan)(guan)(guan)(guan)生(sheng)產工藝簡單，生(sheng)產效率(lv)高(gao)(gao)，成(cheng)本低，發展較快。方管(guan)(guan)(guan)(guan)的(de)(de)(de)強度一(yi)般比直(zhi)(zhi)(zhi)縫焊(han)管(guan)(guan)(guan)(guan)高(gao)(gao)，能用較窄(zhai)的(de)(de)(de)坯(pi)料生(sheng)產管(guan)(guan)(guan)(guan)徑較大的(de)(de)(de)焊(han)管(guan)(guan)(guan)(guan)，還可以用同(tong)(tong)樣(yang)寬(kuan)度的(de)(de)(de)坯(pi)料生(sheng)產管(guan)(guan)(guan)(guan)徑不同(tong)(tong) 的(de)(de)(de)焊(han)管(guan)(guan)(guan)(guan)。但是與相同(tong)(tong)長(chang)度的(de)(de)(de)直(zhi)(zhi)(zhi)縫管(guan)(guan)(guan)(guan)相比，焊(han)縫長(chang)度增(zeng)加(jia) 30~100%，而且生(sheng)產速(su)度較低。因此(ci)，較小口(kou)徑的(de)(de)(de)焊(han)管(guan)(guan)(guan)(guan)大都(dou)采用直(zhi)(zhi)(zhi)縫焊(han)，大口(kou)徑焊(han)管(guan)(guan)(guan)(guan)則大多(duo)采用方管(guan)(guan)(guan)(guan)。

　　低(di)壓(ya)(ya)流(liu)體(ti)(ti)輸送(song)(song)(song)用(yong)(yong)焊(han)接(jie)方管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(GB/6728-2002)也稱一(yi)般焊(han)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)，俗稱黑管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。是(shi)用(yong)(yong)于(yu)輸送(song)(song)(song)水、煤(mei)氣、空氣、油和取暖 蒸汽等一(yi)般較低(di)壓(ya)(ya)力流(liu)體(ti)(ti)和其他用(yong)(yong)途的(de)焊(han)接(jie)鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)接(jie)壁厚(hou)分(fen)為普通鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和加厚(hou)鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan);接(jie)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)端形式分(fen)為不帶(dai)螺紋鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan) (光管(guan)(guan)(guan)(guan)(guan)(guan)(guan))和帶(dai)螺紋鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)規格用(yong)(yong)公稱口徑(mm)表示(shi)，公稱口徑是(shi)內徑的(de)近(jin)似值。習(xi)慣(guan)上常用(yong)(yong)英寸(cun)表示(shi)，如(ru) 11/2 等。低(di)壓(ya)(ya)流(liu)體(ti)(ti)輸送(song)(song)(song)用(yong)(yong)焊(han)接(jie)鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)除直接(jie)用(yong)(yong)于(yu)輸送(song)(song)(song)流(liu)體(ti)(ti)外，還大 量用(yong)(yong)作(zuo)低(di)壓(ya)(ya)流(liu)體(ti)(ti)輸送(song)(song)(song)用(yong)(yong)鍍鋅(xin)焊(han)接(jie)鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)原管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。

　　方(fang)管(guan)是指鋼(gang)(gang)管(guan)的(de)(de)(de)內表(biao)(biao)面(mian)沿圓(yuan)周帶有(you)均(jun)布(bu)的(de)(de)(de)直(zhi)筋(jin)，這種(zhong)鋼(gang)(gang)管(guan)主要用(yong)(yong)(yong)于制作高(gao)效散熱(re)(re)器(qi)(qi)，如大型(xing)(xing)(xing)變壓器(qi)(qi)的(de)(de)(de)散熱(re)(re)器(qi)(qi)。用(yong)(yong)(yong)帶有(you)直(zhi)筋(jin)的(de)(de)(de)鋼(gang)(gang)管(guan)制作的(de)(de)(de)散熱(re)(re)器(qi)(qi)具有(you)散熱(re)(re)能力強、重量輕(qing)，加(jia)工制作工時少(shao)等優點。其生(sheng)(sheng)產(chan)主要采(cai)用(yong)(yong)(yong)冷拔(ba)(ba)(ba)(ba)法，用(yong)(yong)(yong)固定(ding)(ding)模(mo)(mo)冷拔(ba)(ba)(ba)(ba)，也可(ke)用(yong)(yong)(yong)輥(gun)式(shi)模(mo)(mo)冷拔(ba)(ba)(ba)(ba)。金屬在(zai)內外模(mo)(mo)和(he)拔(ba)(ba)(ba)(ba)制力作用(yong)(yong)(yong)下(xia)，凸筋(jin)進入減壁(bi)段后立(li)即被充填到一定(ding)(ding)高(gao)度(du)。由于不均(jun)變形(xing)而產(chan)生(sheng)(sheng)的(de)(de)(de)附加(jia)拉縮變形(xing)，可(ke)使(shi)凸筋(jin)高(gao)度(du)保(bao)持穩定(ding)(ding)。q345b方(fang)管(guan)是指鋼(gang)(gang)管(guan)內表(biao)(biao)面(mian)帶有(you)螺旋(xuan)(xuan)凸筋(jin)，這種(zhong)異型(xing)(xing)(xing)管(guan)傳(chuan)熱(re)(re)效率(lv)高(gao)，使(shi)用(yong)(yong)(yong)安全(quan)可(ke)靠，被廣泛用(yong)(yong)(yong)于高(gao)壓鍋(guo)爐的(de)(de)(de)水冷壁(bi)。內螺旋(xuan)(xuan)凸筋(jin)管(guan)的(de)(de)(de)成(cheng)型(xing)(xing)(xing)方(fang)法有(you)機(ji)加(jia)工成(cheng)型(xing)(xing)(xing)法、焊接+機(ji)加(jia)工成(cheng)型(xing)(xing)(xing)法和(he)冷拔(ba)(ba)(ba)(ba)成(cheng)型(xing)(xing)(xing)法。相比之(zhi)下(xia)，冷拔(ba)(ba)(ba)(ba)成(cheng)型(xing)(xing)(xing)法的(de)(de)(de)生(sheng)(sheng)產(chan)效率(lv)高(gao)，成(cheng)本低，經濟效益好，是目前生(sheng)(sheng)產(chan)內螺旋(xuan)(xuan)凸筋(jin)管(guan)的(de)(de)(de)一種(zhong)主要方(fang)法。冷拔(ba)(ba)(ba)(ba)成(cheng)型(xing)(xing)(xing)法是在(zai)冷拔(ba)(ba)(ba)(ba)過(guo)程中(zhong)使(shi)芯頭作螺旋(xuan)(xuan)運動，從而在(zai)圓(yuan)管(guan)內表(biao)(biao)面(mian)形(xing)成(cheng)內螺旋(xuan)(xuan)凸筋(jin)。其外模(mo)(mo)為固定(ding)(ding)式(shi)，內模(mo)(mo)采(cai)用(yong)(yong)(yong)短芯頭。