雙相不銹鋼管
雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)知識擴展： 雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)要(yao)(yao)求(qiu):由于(yu)雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)具(ju)有(you)很高(gao)(gao)的(de)(de)(de)(de)(de)抗(kang)拉強度(du)(du)(du)(du)(du)和(he)硬度(du)(du)(du)(du)(du)，其抵抗(kang)變(bian)形(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)能力較(jiao)(jiao)高(gao)(gao)，在(zai)筒(tong)體(ti)(ti)(ti)(ti)(ti)、封(feng)頭冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)需要(yao)(yao)的(de)(de)(de)(de)(de)彎曲作(zuo)(zuo)用(yong)力就要(yao)(yao)大得多；另外，冷(leng)塑(su)性(xing)形(xing)(xing)(xing)(xing)變(bian)會(hui)惡化(hua)(hua)雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)的(de)(de)(de)(de)(de)耐應(ying)力腐蝕性(xing)能，因(yin)(yin)此(ci)建議(yi)鋼(gang)板(ban)的(de)(de)(de)(de)(de)變(bian)形(xing)(xing)(xing)(xing)率(lv)(lv)超過１０％時，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)應(ying)對其進(jin)行固溶處(chu)(chu)理(li)(li)。鋼(gang)板(ban)變(bian)形(xing)(xing)(xing)(xing)率(lv)(lv)：ε＝１．５δ／２Ｒ（２）式中(zhong)(zhong)(zhong) δ———鋼(gang)板(ban)的(de)(de)(de)(de)(de)名義厚度(du)(du)(du)(du)(du)，ｍｍ； Ｒ———鋼(gang)板(ban)彎曲變(bian)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)的(de)(de)(de)(de)(de)中(zhong)(zhong)(zhong)性(xing)半徑，ｍｍ。固溶處(chu)(chu)理(li)(li)后(hou)(hou)(hou)再進(jin)行金相(xiang)(xiang)(xiang)(xiang)檢(jian)驗，對于(yu)雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)鐵素(su)體(ti)(ti)(ti)(ti)(ti)含量(liang)(liang)５０％～５５％為(wei)最佳。雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)強度(du)(du)(du)(du)(du)高(gao)(gao)，表面(mian)(mian)應(ying)力大，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)作(zuo)(zuo)用(yong)力大，表面(mian)(mian)缺(que)陷容易誘(you)發(fa)開(kai)裂(lie)(lie)；因(yin)(yin)此(ci)材料(liao)表面(mian)(mian)應(ying)做表面(mian)(mian)檢(jian)測，并消除表面(mian)(mian)缺(que)陷。鐵素(su)體(ti)(ti)(ti)(ti)(ti)相(xiang)(xiang)(xiang)(xiang)會(hui)使工件(jian)冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)仍具(ju)有(you)方向性(xing)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)直邊余量(liang)(liang)不(bu)(bu)(bu)(bu)(bu)等，建議(yi)下(xia)(xia)料(liao)尺寸應(ying)比不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)略大。 熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)要(yao)(yao)求(qiu) 雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)熱(re)(re)(re)(re)(re)(re)(re)加(jia)工成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)要(yao)(yao)控(kong)制好(hao)(hao)始(shi)壓溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)和(he)終(zhong)壓溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)，為(wei)了(le)避(bi)免(mian)產生脆化(hua)(hua)現象，如(ru)雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)應(ying)在(zai)１２３０～１０２５℃范(fan)(fan)(fan)圍(wei)內進(jin)行熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)操作(zuo)(zuo)，熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)立即(ji)進(jin)行固溶處(chu)(chu)理(li)(li)。如(ru)果(guo)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)太低，變(bian)形(xing)(xing)(xing)(xing)就會(hui)聚集在(zai)較(jiao)(jiao)弱(ruo)而(er)且塑(su)性(xing)較(jiao)(jiao)差的(de)(de)(de)(de)(de)鐵素(su)體(ti)(ti)(ti)(ti)(ti)，結(jie)果(guo)造成(cheng)(cheng)(cheng)鐵素(su)體(ti)(ti)(ti)(ti)(ti)在(zai)變(bian)形(xing)(xing)(xing)(xing)區(qu)的(de)(de)(de)(de)(de)嚴重開(kai)裂(lie)(lie)。如(ru)果(guo)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)太高(gao)(gao)，則(ze)鐵素(su)體(ti)(ti)(ti)(ti)(ti)變(bian)得非常軟且可(ke)(ke)能發(fa)生熱(re)(re)(re)(re)(re)(re)(re)撕裂(lie)(lie)。實際的(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)應(ying)在(zai)給(gei)定(ding)的(de)(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)(fan)圍(wei)進(jin)行，因(yin)(yin)為(wei)鐵素(su)體(ti)(ti)(ti)(ti)(ti)和(he)奧氏體(ti)(ti)(ti)(ti)(ti)都(dou)有(you)良好(hao)(hao)的(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)(re)塑(su)性(xing)；因(yin)(yin)此(ci)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)工藝中(zhong)(zhong)(zhong)控(kong)制溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)(fan)圍(wei)及(ji)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)均勻(yun)是一個難點。 ２５０７不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)操作(zuo)(zuo)中(zhong)(zhong)(zhong)應(ying)注意以下(xia)(xia)幾點： （１）由于(yu)雙(shuang)(shuang)相(xiang)(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)室(shi)溫(wen)(wen)(wen)(wen)強度(du)(du)(du)(du)(du)高(gao)(gao)，扭(niu)曲變(bian)形(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)產品(pin)再成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)或矯直比奧氏體(ti)(ti)(ti)(ti)(ti)不(bu)(bu)(bu)(bu)(bu)銹(xiu)(xiu)(xiu)鋼(gang)困難，因(yin)(yin)此(ci)在(zai)固溶溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)下(xia)(xia)，對薄壁、大口(kou)徑工件(jian)設置足(zu)夠的(de)(de)(de)(de)(de)支(zhi)撐(cheng)十分必要(yao)(yao)。 （２）４７５℃脆化(hua)(hua)區(qu)一般會(hui)在(zai)３５０～５２５℃溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)(fan)圍(wei)內出(chu)現，因(yin)(yin)此(ci)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)操作(zuo)(zuo)中(zhong)(zhong)(zhong)嚴格禁止在(zai)此(ci)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)(fan)圍(wei)內作(zuo)(zuo)業。 （３）坯(pi)料(liao)加(jia)熱(re)(re)(re)(re)(re)(re)(re)出(chu)爐后(hou)(hou)(hou)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)下(xia)(xia)降(jiang)迅速(su)，散(san)熱(re)(re)(re)(re)(re)(re)(re)快，很快可(ke)(ke)達脆化(hua)(hua)區(qu)；因(yin)(yin)此(ci)出(chu)爐至(zhi)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)時間應(ying)盡量(liang)(liang)縮短(duan)，封(feng)頭成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)脫模溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)不(bu)(bu)(bu)(bu)(bu)應(ying)低于(yu)９５０℃。熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)建議(yi)對溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)進(jin)行嚴格監(jian)控(kong)。 （４）坯(pi)料(liao)在(zai)加(jia)熱(re)(re)(re)(re)(re)(re)(re)過程(cheng)中(zhong)(zhong)(zhong)，當(dang)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)低于(yu)６００℃時可(ke)(ke)以適當(dang)減小加(jia)熱(re)(re)(re)(re)(re)(re)(re)速(su)率(lv)(lv)，溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)升至(zhi)８００℃左(zuo)右時加(jia)熱(re)(re)(re)(re)(re)(re)(re)速(su)率(lv)(lv)可(ke)(ke)以適當(dang)提高(gao)(gao)。 （５）由于(yu)熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)會(hui)使材料(liao)金相(xiang)(xiang)(xiang)(xiang)失去相(xiang)(xiang)(xiang)(xiang)平(ping)衡，進(jin)而(er)影響材料(liao)的(de)(de)(de)(de)(de)力學性(xing)能和(he)耐腐蝕性(xing)能。熱(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)后(hou)(hou)(hou)應(ying)立即(ji)進(jin)行固溶熱(re)(re)(re)(re)(re)(re)(re)處(chu)(chu)理(li)(li)。
宏觀經濟(ji)形勢(shi)是影(ying)響(xiang)上(shang)半年(nian)鋼(gang)(gang)價一(yi)路(lu)下行的(de)重要因素之一(yi)，其變化(hua)(hua)也(ye)必然將繼續影(ying)響(xiang)下半年(nian)的(de)雙相(xiang)(xiang)不銹鋼(gang)(gang)管市場(chang)(chang)走(zou)勢(shi)。在(zai)宏觀經濟(ji)處(chu)于(yu)“經濟(ji)增(zeng)速(su)換擋(dang)期(qi)(qi)，結構調(diao)整陣痛期(qi)(qi)和前期(qi)(qi)刺激政(zheng)(zheng)策(ce)消化(hua)(hua)期(qi)(qi)”的(de)“三期(qi)(qi)疊加”調(diao)整階段(duan)的(de)情況下，政(zheng)(zheng)策(ce)面(mian)“去(qu)杠(gang)桿化(hua)(hua)”的(de)意圖頗為(wei)明顯(xian)，這導(dao)致上(shang)半年(nian)金融市場(chang)(chang)的(de)資金面(mian)一(yi)直處(chu)于(yu)相(xiang)(xiang)對(dui)緊(jin)張(zhang)的(de)狀態，對(dui)鋼(gang)(gang)鐵(tie)(tie)行業及(ji)下游用(yong)鋼(gang)(gang)行業的(de)資金鏈都構成較為(wei)明顯(xian)的(de)負面(mian)影(ying)響(xiang)。與此同(tong)時(shi)，鋼(gang)(gang)鐵(tie)(tie)業近(jin)幾年(nian)“爆(bao)發(fa)式”增(zeng)長過程中(zhong)(zhong)積(ji)累的(de)自身矛盾也(ye)集中(zhong)(zhong)進入了“爆(bao)發(fa)期(qi)(qi)”，尤其是在(zai)鋼(gang)(gang)貿行業“騙貸(dai)”事(shi)件爆(bao)發(fa)及(ji)鋼(gang)(gang)鐵(tie)(tie)企(qi)業盈利萎(wei)縮直至(zhi)虧損(sun)等情況的(de)出現(xian)后(hou)流(liu)動資金不但不愿意進入雙相(xiang)(xiang)不銹鋼(gang)(gang)管市場(chang)(chang)而且(qie)還(huan)大量(liang)撤(che)走(zou)資金。
公司介紹：
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鄭重承諾，在同等的(de)質量下，保證以最(zui)低的(de)價(jia)格，最(zui)完善的(de)服(fu)務，最(zui)高(gao)的(de)信譽來(lai)答謝各界朋(peng)友的(de)支持與厚愛。歡迎垂詢(xun)光臨！
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