304拉絲不銹鋼管
304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)知識擴展： 304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)冷(leng)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)要求:由于(yu)(yu)304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)具(ju)有很高(gao)(gao)的(de)(de)(de)(de)抗(kang)拉(la)強度(du)(du)(du)和硬(ying)度(du)(du)(du)，其(qi)抵抗(kang)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)能力(li)(li)(li)較(jiao)高(gao)(gao)，在(zai)(zai)筒體(ti)(ti)(ti)、封頭冷(leng)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)中(zhong)(zhong)需(xu)要的(de)(de)(de)(de)彎曲(qu)作用力(li)(li)(li)就(jiu)(jiu)要大(da)得多；另外，冷(leng)塑性形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)變(bian)會(hui)惡化雙相不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)的(de)(de)(de)(de)耐應力(li)(li)(li)腐蝕性能，因此(ci)建(jian)議(yi)鋼(gang)(gang)(gang)板(ban)的(de)(de)(de)(de)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)率超過(guo)１０％時(shi)，成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)應對其(qi)進行固溶(rong)處理。鋼(gang)(gang)(gang)板(ban)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)率：ε＝１．５δ／２Ｒ（２）式(shi)中(zhong)(zhong) δ———鋼(gang)(gang)(gang)板(ban)的(de)(de)(de)(de)名義厚(hou)度(du)(du)(du)，ｍｍ； Ｒ———鋼(gang)(gang)(gang)板(ban)彎曲(qu)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)的(de)(de)(de)(de)中(zhong)(zhong)性半徑(jing)，ｍｍ。固溶(rong)處理后(hou)(hou)再進行金相檢驗(yan)，對于(yu)(yu)304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)鐵素(su)體(ti)(ti)(ti)含量(liang)５０％～５５％為最佳。304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)強度(du)(du)(du)高(gao)(gao)，表(biao)(biao)(biao)面應力(li)(li)(li)大(da)，成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)作用力(li)(li)(li)大(da)，表(biao)(biao)(biao)面缺陷容易誘發開裂(lie)；因此(ci)材料(liao)(liao)表(biao)(biao)(biao)面應做表(biao)(biao)(biao)面檢測，并(bing)消(xiao)除表(biao)(biao)(biao)面缺陷。鐵素(su)體(ti)(ti)(ti)相會(hui)使工(gong)件(jian)冷(leng)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)仍具(ju)有方向性，成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)直邊余(yu)量(liang)不(bu)等，建(jian)議(yi)下(xia)(xia)料(liao)(liao)尺(chi)寸(cun)應比不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)略大(da)。 熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)要求 304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)熱(re)(re)加(jia)(jia)(jia)工(gong)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)中(zhong)(zhong)要控(kong)制好始壓溫(wen)度(du)(du)(du)和終(zhong)壓溫(wen)度(du)(du)(du)，為了(le)避免(mian)產生脆(cui)化現象，如(ru)304拉(la)絲(si)(si)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)管(guan)應在(zai)(zai)１２３０～１０２５℃范圍(wei)(wei)內(nei)(nei)進行熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)操作，熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)立(li)即進行固溶(rong)處理。如(ru)果(guo)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)溫(wen)度(du)(du)(du)太(tai)低(di)，變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)就(jiu)(jiu)會(hui)聚集在(zai)(zai)較(jiao)弱而且塑性較(jiao)差的(de)(de)(de)(de)鐵素(su)體(ti)(ti)(ti)，結果(guo)造成(cheng)(cheng)(cheng)(cheng)鐵素(su)體(ti)(ti)(ti)在(zai)(zai)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)區的(de)(de)(de)(de)嚴重(zhong)開裂(lie)。如(ru)果(guo)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)溫(wen)度(du)(du)(du)太(tai)高(gao)(gao)，則鐵素(su)體(ti)(ti)(ti)變(bian)得非(fei)常軟且可(ke)能發生熱(re)(re)撕裂(lie)。實際的(de)(de)(de)(de)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)應在(zai)(zai)給定的(de)(de)(de)(de)溫(wen)度(du)(du)(du)范圍(wei)(wei)進行，因為鐵素(su)體(ti)(ti)(ti)和奧氏(shi)體(ti)(ti)(ti)都有良好的(de)(de)(de)(de)熱(re)(re)塑性；因此(ci)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)工(gong)藝中(zhong)(zhong)控(kong)制溫(wen)度(du)(du)(du)范圍(wei)(wei)及溫(wen)度(du)(du)(du)均勻是一個難(nan)點(dian)。 ２５０７不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)操作中(zhong)(zhong)應注意以下(xia)(xia)幾點(dian)： （１）由于(yu)(yu)雙相不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)室溫(wen)強度(du)(du)(du)高(gao)(gao)，扭(niu)曲(qu)變(bian)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)產品再成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)或矯直比奧氏(shi)體(ti)(ti)(ti)不(bu)銹(xiu)(xiu)(xiu)(xiu)鋼(gang)(gang)(gang)困難(nan)，因此(ci)在(zai)(zai)固溶(rong)溫(wen)度(du)(du)(du)下(xia)(xia)，對薄壁、大(da)口(kou)徑(jing)工(gong)件(jian)設置足夠(gou)的(de)(de)(de)(de)支撐十分必(bi)要。 （２）４７５℃脆(cui)化區一般會(hui)在(zai)(zai)３５０～５２５℃溫(wen)度(du)(du)(du)范圍(wei)(wei)內(nei)(nei)出(chu)現，因此(ci)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)操作中(zhong)(zhong)嚴格(ge)禁止在(zai)(zai)此(ci)溫(wen)度(du)(du)(du)范圍(wei)(wei)內(nei)(nei)作業。 （３）坯料(liao)(liao)加(jia)(jia)(jia)熱(re)(re)出(chu)爐(lu)后(hou)(hou)溫(wen)度(du)(du)(du)下(xia)(xia)降迅速，散熱(re)(re)快，很快可(ke)達脆(cui)化區；因此(ci)出(chu)爐(lu)至(zhi)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)時(shi)間應盡量(liang)縮短，封頭成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)脫(tuo)模溫(wen)度(du)(du)(du)不(bu)應低(di)于(yu)(yu)９５０℃。熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)中(zhong)(zhong)建(jian)議(yi)對溫(wen)度(du)(du)(du)進行嚴格(ge)監控(kong)。 （４）坯料(liao)(liao)在(zai)(zai)加(jia)(jia)(jia)熱(re)(re)過(guo)程(cheng)中(zhong)(zhong)，當(dang)溫(wen)度(du)(du)(du)低(di)于(yu)(yu)６００℃時(shi)可(ke)以適當(dang)減小(xiao)加(jia)(jia)(jia)熱(re)(re)速率，溫(wen)度(du)(du)(du)升至(zhi)８００℃左右時(shi)加(jia)(jia)(jia)熱(re)(re)速率可(ke)以適當(dang)提(ti)高(gao)(gao)。 （５）由于(yu)(yu)熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)會(hui)使材料(liao)(liao)金相失去相平(ping)衡(heng)，進而影響材料(liao)(liao)的(de)(de)(de)(de)力(li)(li)(li)學性能和耐腐蝕性能。熱(re)(re)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)后(hou)(hou)應立(li)即進行固溶(rong)熱(re)(re)處理。
304拉(la)絲不(bu)銹鋼管洛(luo)氏(shi)硬(ying)(ying)度(du)(du)試(shi)驗同布(bu)氏(shi)硬(ying)(ying)度(du)(du)試(shi)驗一樣，都是(shi)壓痕試(shi)驗方(fang)法。不(bu)同的是(shi)，它是(shi)測量壓痕的深度(du)(du)。洛(luo)氏(shi)硬(ying)(ying)度(du)(du)試(shi)驗是(shi)當前(qian)應用(yong)(yong)很廣的方(fang)法，其(qi)中(zhong)HRC在鋼管標(biao)準中(zhong)使用(yong)(yong)僅(jin)次于(yu)布(bu)氏(shi)硬(ying)(ying)度(du)(du)HB。洛(luo)氏(shi)硬(ying)(ying)度(du)(du)可適(shi)用(yong)(yong)于(yu)測定由極軟(ruan)到極硬(ying)(ying)的金屬材料，它彌補了布(bu)氏(shi)法的不(bu)是(shi)，較布(bu)氏(shi)法簡便，可直接從硬(ying)(ying)度(du)(du)機的表(biao)盤讀(du)出硬(ying)(ying)度(du)(du)值(zhi)。但是(shi)，由于(yu)其(qi)壓痕小，故硬(ying)(ying)度(du)(du)值(zhi)不(bu)如(ru)布(bu)氏(shi)法準確。
公司介紹：
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鄭重承諾，在同等的(de)質量下，保(bao)證以最(zui)低(di)的(de)價(jia)格(ge)，最(zui)完善的(de)服務(wu)，最(zui)高的(de)信(xin)譽(yu)來答謝(xie)各界朋友的(de)支持與厚愛(ai)。歡迎垂詢光臨！
304拉絲不銹鋼管市場大勢維穩運行