西安不銹鋼管加工工藝(yi)之“退(tui)火”篇

  咸陽不銹螺旋(xuan)鋼管(guan)加工處理技(ji)術♏之(zhi)“降溫”篇

退(tui)(tui)火進(jin)(jin)程中產(chan)(chan)生得是(shi)珠光體(ti)改變，退(tui)(tui)火的首要目標是(shi)使(shi)金屬外部(bu)構造(zao)(zao)到達或接(jie)衡狀況，為(wei)后續加工(gong)(gong)和(he)熱(re)處置做籌辦。去應(ying)(ying)(ying)力(li)退(tui)(tui)火是(shi)為(wei)了消(xiao)弭(mi)(mi)因為(wei)塑(su)性꧙形(xing)變加工(gong)(gong)、焊接(jie)等而形(xing)成的和(he)鑄件(jian)(jian)內(nei)存在(zai)(zai)的剩余應(ying)(ying)(ying)力(li)而停止的退(tui)(tui)火工(gong)(gong)藝(yi)。鍛造(zao)(zao)、鍛造(zao)(zao)、焊接(jie)和(he)切(qie)削加工(gong)(gong)后的工(gong)(gong)件(jian)(jian)外部(bu)存在(zai)(zai)內(nei)應(ying)(ying)(ying)力(li)，如不(bu)(bu)實時(shi)消(xiao)弭(mi)(mi)，將使(shi)工(gong)(gong)件(jian)(jian)在(zai)(zai)加工(gong)(gong)和(he)利用進(jin)(jin)程中產(chan)(chan)生變形(xing)，影響工(gong)(gong)件(jian)(jian)精度。接(jie)納去應(ying)(ying)(ying)力(li)退(tui)(tui)火消(xiao)弭(mi)(mi)加工(gong)(gong)進(jin)(jin)程中產(chan)(chan)生的內(nei)應(ying)(ying)(ying)力(li)非常首要。去應(ying)(ying)(ying)力(li)退(tui)(tui)火的加熱(re)溫(wen)度低于相(xiang)變溫(wen)度，是(shi)以，在(zai)(zai)全(quan)部(bu)熱(re)處置進(jin)(jin)程中不(bu)(bu)產(chan)(chan)生構造(zao)(zao)改變。昆明不(bu)(bu)銹不(bu)(bu)銹鋼材(cai)質鋼管生產(chan)(chan)加工(gong)(gong)制(zhi)作工(gong)(gong)藝(yi) 之“去應(ying)(ying)(ying)力(li)退(tui)(tui)火”篇

內(nei)應力(li)首要是經由進程工(gong)(gong)件(jian)在保溫(wen)(wen)(wen)緩(huan)和冷(leng)進程中天(tian)然消(xiao)弭(mi)的。為(wei)了使工(gong)(gong)件(jian)內(nei)應力(li)消(xiao)弭(mi)得(de)(de)更完(wan)全，在加(jia)(jia)熱(re)(re)時(shi)(shi)(shi)應節(jie)(jie)制(zhi)加(jia)(jia)熱(re)(re)溫(wen)(wen)(wen)度。普通是高(gao)溫(wen)(wen)(wen)進爐，而后以(yi)100℃/h擺布得(de)(de)加(jia)(jia)熱(re)(re)速(su)率(lv)加(jia)(jia)熱(re)(re)到(dao)劃定溫(wen)(wen)(wen)度。焊接件(jian)得(de)(de)加(jia)(jia)熱(re)(re)溫(wen)(wen)(wen)度應略高(gao)于600℃。保溫(wen)(wen)(wen)時(shi)(shi)(shi)候視(shi)環(huan)境而定，凡是為(wei)2～4h。鑄件(jian)去(qu)(qu)應力(li)退(tui)火的保溫(wen)(wen)(wen)時(shi)(shi)(shi)候取下限，冷(leng)卻速(su)率(lv)節(jie)(jie)制(zhi)在(20～50)℃/h，冷(leng)至300℃以(yi)下能力(li)出(chu)爐空(kong)冷(leng)。時(shi)(shi)(shi)效處置(zhi)可分為(wei)天(tian)然時(shi)(shi)(shi)效和野生(sheng)(sheng)時(shi)(shi)(shi)效兩(liang)種(zhong)天(tian)然時(shi)(shi)(shi)效是將(jiang)鑄件(jian)置(zhi)于露天(tian)園地(di)半年以(yi)上，便其徐(xu)徐(xu)地(di)產生(sheng)(sheng)，從而使剩(sheng)余應力(li)消(xiao)弭(mi)或(huo)削減(jian)，野生(sheng)(sheng)時(shi)(shi)(shi)效是將(jiang)鑄件(jian)加(jia)(jia)熱(re)(re)到(dao)550～650℃停止(zhi)去(qu)(qu)應力(li)退(tui)火，它比(bi)天(tian)然時(shi)(shi)(shi)效節(jie)(jie)流時(shi)(shi)(shi)候，剩(sheng)余應力(li)去(qu)(qu)除較為(wei)完(wan)全。銀(yin)川不銹無縫管生(sheng)(sheng)產加(jia)(jia)工(gong)(♛gong)加(jia)(jia)工(gong)(gong)之“退(tui)火工(gong)(gong)藝”篇(pian)