Q345D鋼管原廠貨源

　　Q345D一種鋼管的(de)(de)(de)材(cai)質。Q代表的(de)(de)(de)是這種材(cai)質的(de)(de)(de)屈服，后面的(de)(de)(de)345，就(jiu)是指(zhi)這種材(cai)質的(de)(de)(de)屈服值，在345左右。并會隨(sui)著(zhu)材(cai)質的(de)(de)(de)厚度的(de)(de)(de)增加而使其屈服值減小。

　　Q345A，Q345B，Q345C，Q345D，Q345E這(zhe)是質(zhi)量等(deng)級的區(qu)分，從A到(dao)E依次增(zeng)高，主要由于磷和硫等(deng)微元素含量不(bu)同(tong)造成的沖(chong)擊(ji)溫度的區(qu)別，所代表的是沖(chong)擊(ji)的溫度有所不(bu)同(tong)而(er)管化學成分力(li)學性能。

　　Q345D鋼管具有空心(xin)截(jie)面，其長(chang)度遠大(da)于(yu)直(zhi)徑(jing)或(huo)周長(chang)的鋼(gang)(gang)(gang)材。按(an)截(jie)面形(xing)狀分(fen)為(wei)(wei)圓形(xing)、方(fang)形(xing)、矩形(xing)和(he)異形(xing)鋼(gang)(gang)(gang)管(guan)(guan)(guan);按(an)材質分(fen)為(wei)(wei)碳(tan)素結構鋼(gang)(gang)(gang)鋼(gang)(gang)(gang)管(guan)(guan)(guan)、低合(he)金(jin)結構鋼(gang)(gang)(gang)鋼(gang)(gang)(gang)管(guan)(guan)(guan)、合(he)金(jin)鋼(gang)(gang)(gang)鋼(gang)(gang)(gang)管(guan)(guan)(guan)和(he)復合(he)鋼(gang)(gang)(gang)管(guan)(guan)(guan);按(an)用(yong)(yong)(yong)(yong)途分(fen)為(wei)(wei)輸送管(guan)(guan)(guan)道(dao)用(yong)(yong)(yong)(yong)、工(gong)(gong)程結構用(yong)(yong)(yong)(yong)、熱工(gong)(gong)設(she)備用(yong)(yong)(yong)(yong)、石(shi)油化工(gong)(gong)工(gong)(gong)業用(yong)(yong)(yong)(yong)、機械(xie)制造用(yong)(yong)(yong)(yong)、地質鉆探(tan)用(yong)(yong)(yong)(yong)、高壓(ya)設(she)備用(yong)(yong)(yong)(yong)鋼(gang)(gang)(gang)管(guan)(guan)(guan)等;按(an)生產(chan)工(gong)(gong)藝(yi)分(fen)為(wei)(wei)無縫鋼(gang)(gang)(gang)管(guan)(guan)(guan)和(he)焊(han)(han)接(jie)鋼(gang)(gang)(gang)管(guan)(guan)(guan)，其中無縫鋼(gang)(gang)(gang)管(guan)(guan)(guan)又(you)(you)分(fen)熱軋和(he)冷軋(拔)兩種，焊(han)(han)接(jie)鋼(gang)(gang)(gang)管(guan)(guan)(guan)又(you)(you)分(fen)直(zhi)縫焊(han)(han)接(jie)鋼(gang)(gang)(gang)管(guan)(guan)(guan)和(he)螺旋縫焊(han)(han)接(jie)鋼(gang)(gang)(gang)管(guan)(guan)(guan)。

　　Q345D鋼管不僅用(yong)于輸送(song)流體和粉(fen)狀固體、交換熱(re)能、制(zhi)造機(ji)械(xie)(xie)零(ling)件和容器(qi)，它還是一種經濟鋼材(cai)。用(yong)鋼管(guan)(guan)制(zhi)造建筑結構網架(jia)、支柱和機(ji)械(xie)(xie)支架(jia)，可以減 輕(qing)重量，節(jie)(jie)(jie)省金屬20～40%，而且可實現工(gong)廠化機(ji)械(xie)(xie)化施工(gong)。用(yong)鋼管(guan)(guan)制(zhi)造公(gong)路橋梁不但可節(jie)(jie)(jie)省鋼材(cai)、簡化施工(gong)，而且可大大減少涂保護(hu)(hu)層的面(mian)積，節(jie)(jie)(jie)約投資和維護(hu)(hu)費(fei)用(yong)。

　　Q345D鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)分為 無(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)和焊(han)接鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。無(wu)縫(feng)鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)生(sheng) 產過(guo)程是將實心管(guan)(guan)(guan)(guan)(guan)坯或鋼(gang)(gang)(gang)(gang)錠(ding)穿(chuan)成(cheng)空 心的毛管(guan)(guan)(guan)(guan)(guan)，然(ran)后再將其軋制成(cheng)所要(yao) 求尺寸的鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。采用(yong)的穿(chuan)孔和軋管(guan)(guan)(guan)(guan)(guan) 方法不同，就構成(cheng)了生(sheng)產Q345D鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的不同方法。焊(han)接鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)生(sheng)產過(guo)程是 將管(guan)(guan)(guan)(guan)(guan)坯(鋼(gang)(gang)(gang)(gang)板或帶鋼(gang)(gang)(gang)(gang))彎曲成(cheng)管(guan)(guan)(guan)(guan)(guan)狀， 再把(ba)縫(feng)隙焊(han)接起(qi)來(lai)成(cheng)為鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。因采 用(yong)的成(cheng)型(xing)和焊(han)接方法不同，就構成(cheng)了生(sheng)產焊(han)接鋼(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的不同方法。

　　無縫鋼(gang)管主要用熱(re)軋(ya)法生產(chan)。 擠壓法主要用于(yu)生產(chan)難穿孔的(de)(de)低塑 性高(gao)(gao)合(he)金鋼(gang)管或異型鋼(gang)管和(he)復合(he)金 屬管。冷軋(ya)和(he)冷拔法可將熱(re)軋(ya)管繼 續加(jia)工(gong)成小(xiao)直(zhi)徑和(he)薄(bo)壁的(de)(de)鋼(gang)管。焊(han)接鋼(gang)管工(gong)藝(yi)過程簡單、生產(chan) 效率高(gao)(gao)、成本低、產(chan)品(pin)品(pin)種(zhong)日益擴 大(da)。