無縫(feng)(feng)(feng)方(fang)(fang)(fang)矩(ju)管(guan)(guan)按(an)生產工藝分：熱軋無縫(feng)(feng)(feng)方(fang)(fang)(fang)管(guan)(guan)、冷拔無縫(feng)(feng)(feng)方(fang)(fang)(fang)管(guan)(guan)、擠壓無縫(feng)(feng)(feng)方(fang)(fang)(fang)管(guan)(guan)、焊(han)(han)(han)接(jie)方(fang)(fang)(fang)管(guan)(guan)。 其中焊(han)(han)(han)接(jie)方(fang)(fang)(fang)管(guan)(guan)又分為： (a)按(an)工藝分——電(dian)弧焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan)、電(dian)阻焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan)(高(gao)頻、低頻)、氣(qi)焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan)、爐焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan) (b)按(an)焊(han)(han)(han)縫(feng)(feng)(feng)分——直縫(feng)(feng)(feng)焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan)、螺旋焊(han)(han)(han)方(fang)(fang)(fang)管(guan)(guan)
無縫(feng)方(fang)(fang)矩管(guan)(guan)(guan)是(shi)(shi)一(yi)(yi)種具(ju)有中空(kong)截(jie)面周(zhou)邊沒有接(jie)縫(feng)的長條(tiao)鋼(gang)(gang)材(cai)(cai)。鋼(gang)(gang)管(guan)(guan)(guan)具(ju)有中空(kong)截(jie)面，大量用(yong)(yong)(yong)作輸(shu)(shu)送流體的管(guan)(guan)(guan)道，如(ru)(ru)輸(shu)(shu)送石油、天然氣(qi)、煤(mei)氣(qi)、水及某(mou)些固(gu)體物料的管(guan)(guan)(guan)道等(deng)。鋼(gang)(gang)管(guan)(guan)(guan)與圓(yuan)(yuan)鋼(gang)(gang)等(deng)實心鋼(gang)(gang)材(cai)(cai)相(xiang)比，在(zai)抗(kang)彎抗(kang)扭(niu)強(qiang)度(du)相(xiang)同(tong)(tong)時，重量較輕，是(shi)(shi)一(yi)(yi)種經濟(ji)截(jie)面鋼(gang)(gang)材(cai)(cai)，廣泛用(yong)(yong)(yong)于(yu)(yu)制造結構件(jian)和(he)機械零(ling)件(jian)，如(ru)(ru)石油鉆桿、汽車(che)(che)傳(chuan)動軸、自(zi)行車(che)(che)架以及建筑施(shi)工(gong)(gong)中用(yong)(yong)(yong)的鋼(gang)(gang)腳手架等(deng)。用(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)制造環(huan)形(xing)零(ling)件(jian)，可(ke)(ke)提高材(cai)(cai)料利用(yong)(yong)(yong)率，簡化(hua)制造工(gong)(gong)序(xu)，節(jie)約材(cai)(cai)料和(he)加工(gong)(gong)工(gong)(gong)時，如(ru)(ru)滾動軸承套圈、千斤頂套等(deng)，目前已(yi)廣泛用(yong)(yong)(yong)鋼(gang)(gang)管(guan)(guan)(guan)來制造。鋼(gang)(gang)管(guan)(guan)(guan)還(huan)是(shi)(shi)各(ge)種常規武(wu)器不(bu)可(ke)(ke)缺少的材(cai)(cai)料，槍管(guan)(guan)(guan)、炮筒(tong)等(deng)都要鋼(gang)(gang)管(guan)(guan)(guan)來制造。鋼(gang)(gang)管(guan)(guan)(guan)按橫截(jie)面積(ji)形(xing)狀的不(bu)同(tong)(tong)可(ke)(ke)分為圓(yuan)(yuan)管(guan)(guan)(guan)和(he)異型管(guan)(guan)(guan)。由于(yu)(yu)在(zai)周(zhou)長相(xiang)等(deng)的條(tiao)件(jian)下(xia)，圓(yuan)(yuan)面積(ji)最(zui)大，用(yong)(yong)(yong)圓(yuan)(yuan)形(xing)管(guan)(guan)(guan)可(ke)(ke)以輸(shu)(shu)送更多(duo)的流體。此(ci)外，圓(yuan)(yuan)環(huan)截(jie)面在(zai)承受內部或外部徑向(xiang)壓(ya)力(li)時，受力(li)較均勻，因(yin)此(ci)，絕大多(duo)數鋼(gang)(gang)管(guan)(guan)(guan)是(shi)(shi)圓(yuan)(yuan)管(guan)(guan)(guan)。但是(shi)(shi)，圓(yuan)(yuan)管(guan)(guan)(guan)也有一(yi)(yi)定的局限性(xing)，如(ru)(ru)在(zai)受平面彎曲的條(tiao)件(jian)下(xia)，圓(yuan)(yuan)管(guan)(guan)(guan)就不(bu)如(ru)(ru)方(fang)(fang)、矩形(xing)管(guan)(guan)(guan)抗(kang)彎強(qiang)度(du)大，一(yi)(yi)些農機具(ju)骨架、鋼(gang)(gang)木家具(ju)等(deng)就常用(yong)(yong)(yong)方(fang)(fang)、矩形(xing)管(guan)(guan)(guan)。