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直(zhi)縫(feng)(feng)鋼管是焊(han)縫(feng)(feng)與鋼管縱向平行的鋼管，通常分為公制電焊(han)鋼管、電焊(han)薄壁(bi)管、變壓器冷卻油管等(deng)等(deng)。直(zhi)縫(feng)(feng)焊(han)管生產工(gong)藝簡單，生產效率高，成(cheng)本(ben)低，發展較快。

螺旋(xuan)焊(han)(han)管(guan)的(de)(de)強度一般比(bi)直縫焊(han)(han)管(guan)高，能(neng)用(yong)較窄的(de)(de)坯(pi)料生產管(guan)徑較大的(de)(de)焊(han)(han)管(guan)，還(huan)可以(yi)用(yong)同樣寬(kuan)度的(de)(de)坯(pi)料生產管(guan)徑不同的(de)(de)焊(han)(han)管(guan)。但是(shi)與相同長度的(de)(de)直縫管(guan)相比(bi)，焊(han)(han)縫長度增加30~100%，而(er)且(qie)生產速(su)度較低。

直縫(feng)鋼(gang)管是一種(zhong)籠統得叫(jiao)法(fa)，方(fang)式用(yong)鋼(gang)帶生產，在高(gao)頻焊接(jie)設備直縫(feng)焊接(jie)的管子都叫(jiao)直縫(feng)鋼(gang)管。（由于鋼(gang)管的焊接(jie)處(chu)成一條直線故而得名）。

其(qi)中按(an)(an)照用途(tu)不同，又不同的(de)后(hou)道生產工序.(大致可(ke)分(fen)為(wei)腳手(shou)架(jia)管(guan)(guan)(guan)(guan)(guan)(guan)，流(liu)體(ti)管(guan)(guan)(guan)(guan)(guan)(guan)，電(dian)線套(tao)管(guan)(guan)(guan)(guan)(guan)(guan)，支架(jia)管(guan)(guan)(guan)(guan)(guan)(guan)，護欄管(guan)(guan)(guan)(guan)(guan)(guan)等幾種） 而低壓(ya)(ya)流(liu)體(ti)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)是直縫(feng)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)一(yi)種，一(yi)般(ban)(ban)用水，煤(mei)氣(qi)的(de)輸送，在焊(han)(han)(han)接完畢后(hou)比(bi)普通(tong)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)多加以一(yi)道水壓(ya)(ya)測試(shi)，故而低壓(ya)(ya)流(liu)體(ti)管(guan)(guan)(guan)(guan)(guan)(guan)比(bi)普通(tong)直縫(feng)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)價格一(yi)般(ban)(ban)高出一(yi)點（按(an)(an)現(xian)在的(de)市(shi)場價來說，大概高出80元(yuan)左右） 例(li)如(ru)：焊(han)(han)(han)接鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)流(liu)體(ti)1寸（DN25）（就是Φ33.5*3.25) 焊(han)(han)(han)接鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)：也叫焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)，是用鋼(gang)板或鋼(gang)帶經(jing)過彎曲(qu)成(cheng)型(xing)，然(ran)后(hou)經(jing)焊(han)(han)(han)接制成(cheng)。按(an)(an)焊(han)(han)(han)縫(feng)形式分(fen)為(wei)直縫(feng)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)和(he)螺旋焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。按(an)(an)用途(tu)又分(fen)為(wei)一(yi)般(ban)(ban)焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)、鍍(du)鋅焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)、吹氧焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)、電(dian)線套(tao)管(guan)(guan)(guan)(guan)(guan)(guan)、公制焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)、托輥管(guan)(guan)(guan)(guan)(guan)(guan)、深(shen)井泵管(guan)(guan)(guan)(guan)(guan)(guan)、汽車(che)用管(guan)(guan)(guan)(guan)(guan)(guan)、變壓(ya)(ya)器(qi)管(guan)(guan)(guan)(guan)(guan)(guan)、電(dian)焊(han)(han)(han)薄(bo)壁管(guan)(guan)(guan)(guan)(guan)(guan)、電(dian)焊(han)(han)(han)異型(xing)管(guan)(guan)(guan)(guan)(guan)(guan)和(he)螺旋焊(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。

一般(ban)焊(han)管(guan)(guan)：一般(ban)焊(han)管(guan)(guan)用(yong)來輸送低壓流體(ti)。用(yong)Q195A、Q215A、Q235A鋼(gang)制造 。也可(ke)采(cai)用(yong)易于焊(han)接的(de)其它軟鋼(gang)制造。鋼(gang)管(guan)(guan)要進(jin)行水(shui)壓、彎曲、壓扁等實(shi)驗，對(dui)表面質量(liang)有一定(ding)(ding)要求(qiu)，通(tong)常交貨長度(du)為4-10m，常要求(qiu)定(ding)(ding)尺（或(huo)倍尺）交貨。焊(han)管(guan)(guan)的(de)規格(ge)用(yong)公(gong)稱(cheng)(cheng)口(kou)徑(jing) 表示(shi)（毫米或(huo)英寸）公(gong)稱(cheng)(cheng)口(kou)徑(jing)與實(shi)際不(bu)同(tong)，焊(han)管(guan)(guan)按規定(ding)(ding)壁厚(hou)有普通(tong)鋼(gang)管(guan)(guan)和加厚(hou)鋼(gang)管(guan)(guan)兩種(zhong)，鋼(gang)管(guan)(guan)按管(guan)(guan)端形式又分帶螺紋和不(bu)帶螺紋兩種(zhong)，為焊(han)接鋼(gang)管(guan)(guan)尺寸。