內襯不銹鋼管
此后，從長三角地區(qu)全面(mian)限(xian)產(chan)，進一步擴展(zhan)到(dao)沿江八市、汾渭平原，受環(huan)保限(xian)產(chan)影響的(de)(de)(de)區(qu)域逐步擴散。寶城期(qi)貨金(jin)(jin)融研究所所長程小勇也(ye)認(ren)為(wei)，目前(qian)市場普(pu)遍(bian)認(ren)可環(huan)保限(xian)產(chan)對商品(pin)推(tui)漲(zhang)的(de)(de)(de)邏輯(ji)。可以看到(dao)，盡(jin)管商品(pin)中有色近期(qi)跌幅很多，但受環(huan)保限(xian)產(chan)影響較(jiao)大的(de)(de)(de)內襯不銹鋼管幅就不明(ming)顯(xian)。因環(huan)保影響，包括(kuo)黑色和部分化工品(pin)都出現供應失(shi)衡問題，產(chan)能(neng)擴張(zhang)受到(dao)限(xian)制。環(huan)保常態化對黑色系商品(pin)影響較(jiao)為(wei)直觀，此外庫存(cun)(cun)(cun)處于低位，也(ye)是支撐(cheng)價(jia)(jia)格(ge)快(kuai)速上(shang)行的(de)(de)(de)另(ling)一誘因。低庫存(cun)(cun)(cun)下，只要(yao)供應存(cun)(cun)(cun)在一定(ding)收(shou)縮(suo)，價(jia)(jia)格(ge)彈性(xing)就會很大。而2014年以前(qian)，煤炭庫存(cun)(cun)(cun)較(jiao)多的(de)(de)(de)時候(hou)，市場稍微減(jian)產(chan)對價(jia)(jia)格(ge)影響就沒有這么明(ming)顯(xian)。同時，黑色系上(shang)漲(zhang)也(ye)存(cun)(cun)(cun)在資(zi)金(jin)(jin)因素。7月(yue)份(fen)之后的(de)(de)(de)國家金(jin)(jin)融政(zheng)策微調(diao)，銀(yin)行間流動性(xing)變得充裕，資(zi)金(jin)(jin)開始(shi)流向確定(ding)性(xing)比較(jiao)高的(de)(de)(de)商品(pin)資(zi)產(chan)。
內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管知識(shi)擴展： 內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)要求:由于(yu)內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管具有(you)很(hen)高(gao)的(de)(de)(de)抗拉強度(du)(du)和(he)硬度(du)(du)，其(qi)抵抗變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)能力(li)(li)(li)較高(gao)，在(zai)筒體、封頭(tou)冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)需要的(de)(de)(de)彎曲(qu)作(zuo)用力(li)(li)(li)就(jiu)要大(da)(da)得多；另外(wai)，冷塑(su)(su)性形(xing)(xing)(xing)(xing)(xing)(xing)變(bian)(bian)會惡化(hua)(hua)雙相(xiang)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)的(de)(de)(de)耐(nai)應(ying)力(li)(li)(li)腐蝕性能，因(yin)(yin)(yin)(yin)(yin)此(ci)建議(yi)(yi)鋼(gang)(gang)板(ban)(ban)的(de)(de)(de)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)率(lv)超(chao)過１０％時(shi)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)應(ying)對(dui)其(qi)進(jin)(jin)行(xing)(xing)固(gu)溶(rong)處(chu)理(li)。鋼(gang)(gang)板(ban)(ban)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)率(lv)：ε＝１．５δ／２Ｒ（２）式(shi)中(zhong)(zhong)(zhong) δ———鋼(gang)(gang)板(ban)(ban)的(de)(de)(de)名義(yi)厚度(du)(du)，ｍｍ； Ｒ———鋼(gang)(gang)板(ban)(ban)彎曲(qu)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)的(de)(de)(de)中(zhong)(zhong)(zhong)性半徑(jing)，ｍｍ。固(gu)溶(rong)處(chu)理(li)后(hou)再進(jin)(jin)行(xing)(xing)金相(xiang)檢驗(yan)，對(dui)于(yu)內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管鐵(tie)素(su)體含量５０％～５５％為(wei)最(zui)佳(jia)。內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管強度(du)(du)高(gao)，表(biao)面(mian)應(ying)力(li)(li)(li)大(da)(da)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)作(zuo)用力(li)(li)(li)大(da)(da)，表(biao)面(mian)缺(que)陷容易(yi)誘發開裂；因(yin)(yin)(yin)(yin)(yin)此(ci)材(cai)(cai)(cai)料(liao)(liao)(liao)表(biao)面(mian)應(ying)做(zuo)表(biao)面(mian)檢測，并消除表(biao)面(mian)缺(que)陷。鐵(tie)素(su)體相(xiang)會使(shi)工(gong)(gong)件冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)仍具有(you)方向性，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)直邊余量不(bu)(bu)(bu)(bu)等，建議(yi)(yi)下料(liao)(liao)(liao)尺寸應(ying)比不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)略大(da)(da)。 熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)要求 內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管熱(re)(re)(re)(re)(re)加(jia)工(gong)(gong)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)要控(kong)制好始壓(ya)溫(wen)(wen)度(du)(du)和(he)終壓(ya)溫(wen)(wen)度(du)(du)，為(wei)了避(bi)免產生脆(cui)化(hua)(hua)現(xian)象，如(ru)內(nei)(nei)(nei)(nei)襯(chen)(chen)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管應(ying)在(zai)１２３０～１０２５℃范(fan)圍內(nei)(nei)(nei)(nei)進(jin)(jin)行(xing)(xing)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)操(cao)(cao)作(zuo)，熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)立即(ji)進(jin)(jin)行(xing)(xing)固(gu)溶(rong)處(chu)理(li)。如(ru)果熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)溫(wen)(wen)度(du)(du)太低(di)，變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)就(jiu)會聚集在(zai)較弱而且塑(su)(su)性較差的(de)(de)(de)鐵(tie)素(su)體，結(jie)果造成(cheng)(cheng)(cheng)鐵(tie)素(su)體在(zai)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)區(qu)的(de)(de)(de)嚴(yan)重開裂。如(ru)果熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)溫(wen)(wen)度(du)(du)太高(gao)，則鐵(tie)素(su)體變(bian)(bian)得非常軟且可(ke)(ke)能發生熱(re)(re)(re)(re)(re)撕(si)裂。實際(ji)的(de)(de)(de)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)應(ying)在(zai)給定的(de)(de)(de)溫(wen)(wen)度(du)(du)范(fan)圍進(jin)(jin)行(xing)(xing)，因(yin)(yin)(yin)(yin)(yin)為(wei)鐵(tie)素(su)體和(he)奧氏體都有(you)良好的(de)(de)(de)熱(re)(re)(re)(re)(re)塑(su)(su)性；因(yin)(yin)(yin)(yin)(yin)此(ci)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)工(gong)(gong)藝中(zhong)(zhong)(zhong)控(kong)制溫(wen)(wen)度(du)(du)范(fan)圍及溫(wen)(wen)度(du)(du)均勻是一個難點。 ２５０７不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)操(cao)(cao)作(zuo)中(zhong)(zhong)(zhong)應(ying)注(zhu)意(yi)以(yi)下幾(ji)點： （１）由于(yu)雙相(xiang)不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)室溫(wen)(wen)強度(du)(du)高(gao)，扭曲(qu)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)產品(pin)再成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)或(huo)矯直比奧氏體不(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)困難，因(yin)(yin)(yin)(yin)(yin)此(ci)在(zai)固(gu)溶(rong)溫(wen)(wen)度(du)(du)下，對(dui)薄壁、大(da)(da)口徑(jing)工(gong)(gong)件設置足夠的(de)(de)(de)支撐十分必要。 （２）４７５℃脆(cui)化(hua)(hua)區(qu)一般會在(zai)３５０～５２５℃溫(wen)(wen)度(du)(du)范(fan)圍內(nei)(nei)(nei)(nei)出(chu)現(xian)，因(yin)(yin)(yin)(yin)(yin)此(ci)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)操(cao)(cao)作(zuo)中(zhong)(zhong)(zhong)嚴(yan)格禁止在(zai)此(ci)溫(wen)(wen)度(du)(du)范(fan)圍內(nei)(nei)(nei)(nei)作(zuo)業。 （３）坯料(liao)(liao)(liao)加(jia)熱(re)(re)(re)(re)(re)出(chu)爐(lu)后(hou)溫(wen)(wen)度(du)(du)下降迅速，散熱(re)(re)(re)(re)(re)快(kuai)，很(hen)快(kuai)可(ke)(ke)達脆(cui)化(hua)(hua)區(qu)；因(yin)(yin)(yin)(yin)(yin)此(ci)出(chu)爐(lu)至成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)時(shi)間應(ying)盡量縮短，封頭(tou)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)脫(tuo)模溫(wen)(wen)度(du)(du)不(bu)(bu)(bu)(bu)應(ying)低(di)于(yu)９５０℃。熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)過程(cheng)中(zhong)(zhong)(zhong)建議(yi)(yi)對(dui)溫(wen)(wen)度(du)(du)進(jin)(jin)行(xing)(xing)嚴(yan)格監控(kong)。 （４）坯料(liao)(liao)(liao)在(zai)加(jia)熱(re)(re)(re)(re)(re)過程(cheng)中(zhong)(zhong)(zhong)，當(dang)(dang)溫(wen)(wen)度(du)(du)低(di)于(yu)６００℃時(shi)可(ke)(ke)以(yi)適當(dang)(dang)減小加(jia)熱(re)(re)(re)(re)(re)速率(lv)，溫(wen)(wen)度(du)(du)升(sheng)至８００℃左右時(shi)加(jia)熱(re)(re)(re)(re)(re)速率(lv)可(ke)(ke)以(yi)適當(dang)(dang)提高(gao)。 （５）由于(yu)熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)會使(shi)材(cai)(cai)(cai)料(liao)(liao)(liao)金相(xiang)失去相(xiang)平衡，進(jin)(jin)而影(ying)響材(cai)(cai)(cai)料(liao)(liao)(liao)的(de)(de)(de)力(li)(li)(li)學性能和(he)耐(nai)腐蝕性能。熱(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)后(hou)應(ying)立即(ji)進(jin)(jin)行(xing)(xing)固(gu)溶(rong)熱(re)(re)(re)(re)(re)處(chu)理(li)。
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鄭重承諾，在同等的(de)質量下，保證以最(zui)低(di)的(de)價(jia)格，最(zui)完善的(de)服務，最(zui)高(gao)的(de)信譽(yu)來答謝各界朋友的(de)支持與厚愛。歡迎垂詢(xun)光臨！
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