鏡面不銹鋼管
鏡面(mian)不(bu)(bu)銹鋼管洛(luo)氏硬(ying)度(du)(du)試驗同布(bu)(bu)氏硬(ying)度(du)(du)試驗一樣，都是(shi)壓痕(hen)試驗方法(fa)。不(bu)(bu)同的(de)(de)是(shi)，它(ta)是(shi)測(ce)量(liang)壓痕(hen)的(de)(de)深(shen)度(du)(du)。洛(luo)氏硬(ying)度(du)(du)試驗是(shi)當(dang)前應用(yong)很廣(guang)的(de)(de)方法(fa)，其(qi)(qi)中HRC在鋼管標(biao)準(zhun)中使用(yong)僅次于(yu)布(bu)(bu)氏硬(ying)度(du)(du)HB。洛(luo)氏硬(ying)度(du)(du)可適用(yong)于(yu)測(ce)定由極軟到極硬(ying)的(de)(de)金屬材料，它(ta)彌補了布(bu)(bu)氏法(fa)的(de)(de)不(bu)(bu)是(shi)，較布(bu)(bu)氏法(fa)簡(jian)便，可直接從硬(ying)度(du)(du)機的(de)(de)表盤讀出硬(ying)度(du)(du)值(zhi)。但是(shi)，由于(yu)其(qi)(qi)壓痕(hen)小，故硬(ying)度(du)(du)值(zhi)不(bu)(bu)如布(bu)(bu)氏法(fa)準(zhun)確。
鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)知識擴(kuo)展： 鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)要求:由于鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)具有(you)很(hen)高(gao)(gao)(gao)的(de)(de)(de)(de)抗拉強度(du)(du)(du)(du)(du)和(he)硬度(du)(du)(du)(du)(du)，其(qi)抵抗變形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)能(neng)力(li)較高(gao)(gao)(gao)，在筒體(ti)(ti)、封頭(tou)冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程中需要的(de)(de)(de)(de)彎(wan)曲(qu)作用(yong)(yong)力(li)就(jiu)(jiu)要大(da)(da)(da)得(de)多(duo)；另外，冷塑性(xing)(xing)形(xing)(xing)(xing)(xing)(xing)變會(hui)惡化雙(shuang)相(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)的(de)(de)(de)(de)耐(nai)應力(li)腐蝕(shi)性(xing)(xing)能(neng)，因(yin)此建議(yi)鋼(gang)(gang)板的(de)(de)(de)(de)變形(xing)(xing)(xing)(xing)(xing)率(lv)超過(guo)１０％時(shi)(shi)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)應對其(qi)進(jin)行固(gu)溶(rong)(rong)處(chu)理(li)。鋼(gang)(gang)板變形(xing)(xing)(xing)(xing)(xing)率(lv)：ε＝１．５δ／２Ｒ（２）式中 δ———鋼(gang)(gang)板的(de)(de)(de)(de)名義厚度(du)(du)(du)(du)(du)，ｍｍ； Ｒ———鋼(gang)(gang)板彎(wan)曲(qu)變形(xing)(xing)(xing)(xing)(xing)后(hou)的(de)(de)(de)(de)中性(xing)(xing)半徑，ｍｍ。固(gu)溶(rong)(rong)處(chu)理(li)后(hou)再進(jin)行金(jin)相(xiang)(xiang)(xiang)檢驗(yan)，對于鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)鐵素(su)(su)體(ti)(ti)含(han)量(liang)５０％～５５％為(wei)(wei)最佳。鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)強度(du)(du)(du)(du)(du)高(gao)(gao)(gao)，表(biao)(biao)面(mian)(mian)應力(li)大(da)(da)(da)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)作用(yong)(yong)力(li)大(da)(da)(da)，表(biao)(biao)面(mian)(mian)缺陷容易誘發開裂(lie)(lie)；因(yin)此材(cai)料(liao)(liao)(liao)表(biao)(biao)面(mian)(mian)應做表(biao)(biao)面(mian)(mian)檢測，并消除表(biao)(biao)面(mian)(mian)缺陷。鐵素(su)(su)體(ti)(ti)相(xiang)(xiang)(xiang)會(hui)使工(gong)(gong)件冷成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)仍具有(you)方向性(xing)(xing)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)直邊余量(liang)不(bu)(bu)(bu)(bu)(bu)等，建議(yi)下(xia)(xia)料(liao)(liao)(liao)尺寸應比不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)略大(da)(da)(da)。 熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)要求 鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)熱(re)(re)(re)(re)(re)(re)(re)(re)加(jia)(jia)工(gong)(gong)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程中要控制好(hao)始壓(ya)(ya)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)和(he)終壓(ya)(ya)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)，為(wei)(wei)了避免產生脆(cui)化現象，如(ru)鏡(jing)面(mian)(mian)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)管(guan)(guan)應在１２３０～１０２５℃范(fan)(fan)圍內進(jin)行熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作，熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)立即進(jin)行固(gu)溶(rong)(rong)處(chu)理(li)。如(ru)果(guo)(guo)熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)太低，變形(xing)(xing)(xing)(xing)(xing)就(jiu)(jiu)會(hui)聚集(ji)在較弱而(er)且塑性(xing)(xing)較差的(de)(de)(de)(de)鐵素(su)(su)體(ti)(ti)，結果(guo)(guo)造成(cheng)(cheng)(cheng)鐵素(su)(su)體(ti)(ti)在變形(xing)(xing)(xing)(xing)(xing)區(qu)的(de)(de)(de)(de)嚴(yan)重(zhong)開裂(lie)(lie)。如(ru)果(guo)(guo)熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)太高(gao)(gao)(gao)，則鐵素(su)(su)體(ti)(ti)變得(de)非常軟且可(ke)(ke)(ke)能(neng)發生熱(re)(re)(re)(re)(re)(re)(re)(re)撕裂(lie)(lie)。實際的(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)應在給定的(de)(de)(de)(de)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)圍進(jin)行，因(yin)為(wei)(wei)鐵素(su)(su)體(ti)(ti)和(he)奧氏體(ti)(ti)都(dou)有(you)良好(hao)的(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)(re)(re)塑性(xing)(xing)；因(yin)此熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)工(gong)(gong)藝中控制溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)圍及溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)均勻是(shi)一個難(nan)點。 ２５０７不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作中應注(zhu)意以(yi)下(xia)(xia)幾點： （１）由于雙(shuang)相(xiang)(xiang)(xiang)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)室溫(wen)(wen)(wen)(wen)強度(du)(du)(du)(du)(du)高(gao)(gao)(gao)，扭曲(qu)變形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)產品再成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)或(huo)矯直比奧氏體(ti)(ti)不(bu)(bu)(bu)(bu)(bu)銹(xiu)鋼(gang)(gang)困難(nan)，因(yin)此在固(gu)溶(rong)(rong)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)下(xia)(xia)，對薄壁、大(da)(da)(da)口徑工(gong)(gong)件設置足夠的(de)(de)(de)(de)支撐(cheng)十分(fen)必要。 （２）４７５℃脆(cui)化區(qu)一般會(hui)在３５０～５２５℃溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)圍內出(chu)現，因(yin)此熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作中嚴(yan)格禁止在此溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)范(fan)(fan)圍內作業。 （３）坯(pi)料(liao)(liao)(liao)加(jia)(jia)熱(re)(re)(re)(re)(re)(re)(re)(re)出(chu)爐后(hou)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)下(xia)(xia)降迅速(su)，散(san)熱(re)(re)(re)(re)(re)(re)(re)(re)快，很(hen)快可(ke)(ke)(ke)達脆(cui)化區(qu)；因(yin)此出(chu)爐至成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)時(shi)(shi)間應盡量(liang)縮短，封頭(tou)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)脫模溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)不(bu)(bu)(bu)(bu)(bu)應低于９５０℃。熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程中建議(yi)對溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)進(jin)行嚴(yan)格監控。 （４）坯(pi)料(liao)(liao)(liao)在加(jia)(jia)熱(re)(re)(re)(re)(re)(re)(re)(re)過(guo)程中，當溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)低于６００℃時(shi)(shi)可(ke)(ke)(ke)以(yi)適當減小加(jia)(jia)熱(re)(re)(re)(re)(re)(re)(re)(re)速(su)率(lv)，溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)升至８００℃左右時(shi)(shi)加(jia)(jia)熱(re)(re)(re)(re)(re)(re)(re)(re)速(su)率(lv)可(ke)(ke)(ke)以(yi)適當提(ti)高(gao)(gao)(gao)。 （５）由于熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)會(hui)使材(cai)料(liao)(liao)(liao)金(jin)相(xiang)(xiang)(xiang)失(shi)去相(xiang)(xiang)(xiang)平衡，進(jin)而(er)影響材(cai)料(liao)(liao)(liao)的(de)(de)(de)(de)力(li)學(xue)性(xing)(xing)能(neng)和(he)耐(nai)腐蝕(shi)性(xing)(xing)能(neng)。熱(re)(re)(re)(re)(re)(re)(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)應立即進(jin)行固(gu)溶(rong)(rong)熱(re)(re)(re)(re)(re)(re)(re)(re)處(chu)理(li)。
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)服務，最(zui)高的(de)信(xin)譽(yu)來答謝各界朋友(you)的(de)支持與厚愛。歡迎垂詢光臨(lin)！
鏡面不銹鋼管周初價格大幅上升