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直(zhi)縫(feng)(feng)鋼(gang)管是(shi)焊(han)(han)縫(feng)(feng)與鋼(gang)管縱向平行的鋼(gang)管，通常(chang)分為公制(zhi)電(dian)焊(han)(han)鋼(gang)管、電(dian)焊(han)(han)薄(bo)壁管、變(bian)壓器冷卻油管等等。直(zhi)縫(feng)(feng)焊(han)(han)管生產工藝簡單(dan)，生產效率高，成本低(di)，發(fa)展(zhan)較(jiao)快。

螺旋焊管(guan)(guan)(guan)的(de)強度(du)(du)一般比直縫(feng)(feng)焊管(guan)(guan)(guan)高，能(neng)用(yong)較(jiao)窄的(de)坯(pi)料生(sheng)產(chan)管(guan)(guan)(guan)徑(jing)較(jiao)大的(de)焊管(guan)(guan)(guan)，還可以用(yong)同樣(yang)寬度(du)(du)的(de)坯(pi)料生(sheng)產(chan)管(guan)(guan)(guan)徑(jing)不同的(de)焊管(guan)(guan)(guan)。但是與相同長度(du)(du)的(de)直縫(feng)(feng)管(guan)(guan)(guan)相比，焊縫(feng)(feng)長度(du)(du)增(zeng)加30~100%，而(er)且(qie)生(sheng)產(chan)速度(du)(du)較(jiao)低。

直縫鋼(gang)管(guan)(guan)是一(yi)種籠統得(de)叫(jiao)法，方式(shi)用鋼(gang)帶生產，在高頻焊接設備直縫焊接的管(guan)(guan)子都叫(jiao)直縫鋼(gang)管(guan)(guan)。（由于鋼(gang)管(guan)(guan)的焊接處成一(yi)條(tiao)直線故而得(de)名）。

其中(zhong)按(an)照用(yong)(yong)途不(bu)同(tong)，又不(bu)同(tong)的后道生產工序.(大致可分為腳手架管(guan)(guan)(guan)(guan)(guan)，流體管(guan)(guan)(guan)(guan)(guan)，電(dian)線(xian)套管(guan)(guan)(guan)(guan)(guan)，支架管(guan)(guan)(guan)(guan)(guan)，護欄管(guan)(guan)(guan)(guan)(guan)等幾種） 而低壓流體焊(han)管(guan)(guan)(guan)(guan)(guan)是(shi)直(zhi)縫(feng)焊(han)管(guan)(guan)(guan)(guan)(guan)的一種，一般(ban)用(yong)(yong)水(shui)，煤氣的輸(shu)送，在(zai)(zai)焊(han)接完(wan)畢后比(bi)(bi)普通焊(han)管(guan)(guan)(guan)(guan)(guan)多(duo)加以一道水(shui)壓測試，故而低壓流體管(guan)(guan)(guan)(guan)(guan)比(bi)(bi)普通直(zhi)縫(feng)焊(han)管(guan)(guan)(guan)(guan)(guan)價(jia)格(ge)一般(ban)高出(chu)一點(dian)（按(an)現在(zai)(zai)的市(shi)場價(jia)來說，大概高出(chu)80元左右(you)） 例如：焊(han)接鋼管(guan)(guan)(guan)(guan)(guan)流體1寸（DN25）（就是(shi)Φ33.5*3.25) 焊(han)接鋼管(guan)(guan)(guan)(guan)(guan)：也叫焊(han)管(guan)(guan)(guan)(guan)(guan)，是(shi)用(yong)(yong)鋼板或鋼帶經過彎曲(qu)成型，然后經焊(han)接制成。按(an)焊(han)縫(feng)形式分為直(zhi)縫(feng)焊(han)管(guan)(guan)(guan)(guan)(guan)和(he)螺(luo)旋焊(han)管(guan)(guan)(guan)(guan)(guan)。按(an)用(yong)(yong)途又分為一般(ban)焊(han)管(guan)(guan)(guan)(guan)(guan)、鍍(du)鋅焊(han)管(guan)(guan)(guan)(guan)(guan)、吹氧焊(han)管(guan)(guan)(guan)(guan)(guan)、電(dian)線(xian)套管(guan)(guan)(guan)(guan)(guan)、公制焊(han)管(guan)(guan)(guan)(guan)(guan)、托(tuo)輥管(guan)(guan)(guan)(guan)(guan)、深井泵管(guan)(guan)(guan)(guan)(guan)、汽車用(yong)(yong)管(guan)(guan)(guan)(guan)(guan)、變壓器管(guan)(guan)(guan)(guan)(guan)、電(dian)焊(han)薄壁管(guan)(guan)(guan)(guan)(guan)、電(dian)焊(han)異型管(guan)(guan)(guan)(guan)(guan)和(he)螺(luo)旋焊(han)管(guan)(guan)(guan)(guan)(guan)。

一(yi)般焊(han)(han)管(guan)(guan)(guan)：一(yi)般焊(han)(han)管(guan)(guan)(guan)用(yong)來(lai)輸送低壓(ya)流體。用(yong)Q195A、Q215A、Q235A鋼制造 。也可(ke)采(cai)用(yong)易于焊(han)(han)接的其(qi)它軟鋼制造。鋼管(guan)(guan)(guan)要進行水壓(ya)、彎曲、壓(ya)扁等實驗，對表面質量有一(yi)定(ding)(ding)要求，通常交貨長度(du)為4-10m，常要求定(ding)(ding)尺（或(huo)倍(bei)尺）交貨。焊(han)(han)管(guan)(guan)(guan)的規(gui)格用(yong)公稱口徑 表示（毫米或(huo)英(ying)寸）公稱口徑與實際不(bu)同，焊(han)(han)管(guan)(guan)(guan)按規(gui)定(ding)(ding)壁厚有普通鋼管(guan)(guan)(guan)和(he)(he)加厚鋼管(guan)(guan)(guan)兩種，鋼管(guan)(guan)(guan)按管(guan)(guan)(guan)端(duan)形式(shi)又分帶螺(luo)紋(wen)和(he)(he)不(bu)帶螺(luo)紋(wen)兩種，為焊(han)(han)接鋼管(guan)(guan)(guan)尺寸。