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無縫方管是(shi)一(yi)種(zhong)具(ju)有中(zhong)(zhong)空截面(mian)周邊沒有接縫的(de)(de)(de)長條鋼(gang)(gang)(gang)材。鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)具(ju)有中(zhong)(zhong)空截面(mian),大量用(yong)作輸送流(liu)體(ti)的(de)(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道,如(ru)輸送石油、天然氣、煤氣、水及(ji)某些(xie)固體(ti)物料(liao)的(de)(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道等(deng)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)與圓(yuan)(yuan)(yuan)鋼(gang)(gang)(gang)等(deng)實(shi)心鋼(gang)(gang)(gang)材相比,在抗(kang)彎(wan)抗(kang)扭強度相同時,重量較輕,是(shi)一(yi)種(zhong)經(jing)濟截面(mian)鋼(gang)(gang)(gang)材,廣(guang)泛(fan)用(yong)于(yu)制造(zao)(zao)結構件和機械零件,如(ru)石油鉆桿、汽車(che)傳動軸、自行車(che)架(jia)以及(ji)建筑施(shi)工中(zhong)(zhong)用(yong)的(de)(de)(de)鋼(gang)(gang)(gang)腳(jiao)手架(jia)等(deng)。用(yong)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)制造(zao)(zao)環形零件,可提(ti)高材料(liao)利用(yong)率,簡化制造(zao)(zao)工序(xu),節約(yue)材料(liao)和加工工時,如(ru)滾動軸承套圈、千(qian)斤頂(ding)套等(deng),目前(qian)已廣(guang)泛(fan)用(yong)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)來制造(zao)(zao)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)還是(shi)各種(zhong)常規武器不(bu)(bu)可缺少的(de)(de)(de)材料(liao),槍管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、炮(pao)筒等(deng)都要(yao)鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)來制造(zao)(zao)。鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)按橫截面(mian)積形狀的(de)(de)(de)不(bu)(bu)同可分(fen)為圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)和異(yi)型(xing)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。由于(yu)在周長相等(deng)的(de)(de)(de)條件下(xia)(xia),圓(yuan)(yuan)(yuan)面(mian)積最大,用(yong)圓(yuan)(yuan)(yuan)形管(guan)(guan)(guan)(guan)(guan)(guan)(guan)可以輸送更(geng)多(duo)的(de)(de)(de)流(liu)體(ti)。此外,圓(yuan)(yuan)(yuan)環截面(mian)在承受(shou)內部或外部徑向壓力時,受(shou)力較均勻,因(yin)此,絕大多(duo)數鋼(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)是(shi)圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。但(dan)是(shi),圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)也有一(yi)定的(de)(de)(de)局限性,如(ru)在受(shou)平面(mian)彎(wan)曲的(de)(de)(de)條件下(xia)(xia),圓(yuan)(yuan)(yuan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)就不(bu)(bu)如(ru)方、矩形管(guan)(guan)(guan)(guan)(guan)(guan)(guan)抗(kang)彎(wan)強度大,一(yi)些(xie)農(nong)機具(ju)骨架(jia)、鋼(gang)(gang)(gang)木家具(ju)等(deng)就常用(yong)方、矩形管(guan)(guan)(guan)(guan)(guan)(guan)(guan)。根據不(bu)(bu)同用(yong)方管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)力學性能
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