20cr厚壁無縫鋼管
具(ju)有中空截面,大量用(yong)(yong)作輸送流(liu)體(ti)的(de)管(guan)(guan)道,如輸送石油、天然(ran)氣(qi)、煤氣(qi)、水(shui)及某(mou)些固體(ti)物料(liao)等(deng)。與圓(yuan)(yuan)(yuan)鋼(gang)(gang)等(deng)實心鋼(gang)(gang)材(cai)(cai)相比,在抗彎抗扭強度相同時,重量較(jiao)輕,20Cr無縫鋼(gang)(gang)管(guan)(guan)是(shi)(shi)一種(zhong)經(jing)濟(ji)截面鋼(gang)(gang)材(cai)(cai),廣(guang)泛用(yong)(yong)于制(zhi)(zhi)造(zao)結構件(jian)(jian)和機械零(ling)件(jian)(jian),如石油鉆(zhan)桿、汽(qi)車傳(chuan)動軸(zhou)、自(zi)行車架以及建筑(zhu)施工中用(yong)(yong)的(de)鋼(gang)(gang)腳手架等(deng)。用(yong)(yong)20Cr鋼(gang)(gang)管(guan)(guan)制(zhi)(zhi)造(zao)環形(xing)零(ling)件(jian)(jian),可提高材(cai)(cai)料(liao)利用(yong)(yong)率,簡(jian)化制(zhi)(zhi)造(zao)工序,節(jie)約材(cai)(cai)料(liao)和加工工時,如滾動軸(zhou)承(cheng)套圈、千斤(jin)頂套等(deng),目(mu)前已廣(guang)泛用(yong)(yong)鋼(gang)(gang)管(guan)(guan)來制(zhi)(zhi)造(zao)。20Cr無縫鋼(gang)(gang)管(guan)(guan)還是(shi)(shi)各(ge)種(zhong)常規武(wu)器不(bu)可缺少(shao)的(de)材(cai)(cai)料(liao),槍管(guan)(guan)、炮筒等(deng)都要鋼(gang)(gang)管(guan)(guan)來制(zhi)(zhi)造(zao)。20Cr鋼(gang)(gang)管(guan)(guan)按橫截面積形(xing)狀的(de)不(bu)同可分為圓(yuan)(yuan)(yuan)管(guan)(guan)和異(yi)型管(guan)(guan)。由于在周長相等(deng)的(de)條件(jian)(jian)下,圓(yuan)(yuan)(yuan)面積最大,用(yong)(yong)圓(yuan)(yuan)(yuan)形(xing)管(guan)(guan)可以輸送更多的(de)流(liu)體(ti)。此外(wai),圓(yuan)(yuan)(yuan)環截面在承(cheng)受內部或外(wai)部徑向壓力(li)(li)時,受力(li)(li)較(jiao)均(jun)勻,因此,絕大多數鋼(gang)(gang)管(guan)(guan)是(shi)(shi)圓(yuan)(yuan)(yuan)形(xing)管(guan)(guan)材(cai)(cai)。
20Cr無縫(feng)鋼管
化學成(cheng)份(fen)(%):硅(gui):0.17~0.37
力學(xue)性能(neng):抗拉強(qiang)度(du) σb (MPa):≥835屈服(fu)強(qiang)度(du) σs (MPa):≥540伸長率(lv) δ5 (%):≥10斷面收縮率(lv) ψ (%):≥40,沖(chong)擊(ji)吸收功Ak(J)≥47硬度(du):退(tui)火(huo)或高溫(wen)回(hui)火(huo)供應狀(zhuang)態硬度(du)≤156HB,試樣尺寸:試樣尺寸15mm
熱(re)處(chu)理(li)規范及(ji)金(jin)相組(zu)織:
熱處理(li)規范:淬火溫度(℃)第一次880,第二次780~820,冷卻劑水和油(you)。回火溫度(℃)200,冷卻劑水、空。
焊接性能:
2、厚度大于15mm的20Cr零件(jian)在焊前需預熱(re)到100~150℃,若要求不(bu)高焊前可不(bu)預熱(re),焊后也(ye)可不(bu)進行回火熱(re)處理。
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