方形不銹鋼管
方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)知識擴展： 方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)要(yao)求:由(you)于(yu)方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)具(ju)有很(hen)高的(de)(de)(de)(de)(de)(de)抗拉強度(du)(du)(du)和(he)硬度(du)(du)(du)，其抵(di)抗變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)能(neng)力(li)(li)(li)較(jiao)高，在(zai)(zai)筒體(ti)(ti)、封頭冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)(cheng)中(zhong)需要(yao)的(de)(de)(de)(de)(de)(de)彎(wan)曲作(zuo)用(yong)力(li)(li)(li)就要(yao)大(da)得多；另外，冷(leng)塑性(xing)形(xing)(xing)(xing)(xing)(xing)變(bian)(bian)會惡化(hua)雙(shuang)相(xiang)(xiang)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)的(de)(de)(de)(de)(de)(de)耐應力(li)(li)(li)腐蝕(shi)性(xing)能(neng)，因(yin)此(ci)建議鋼(gang)(gang)(gang)(gang)板(ban)(ban)的(de)(de)(de)(de)(de)(de)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)率超(chao)過(guo)１０％時(shi)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)應對(dui)(dui)其進行固(gu)溶(rong)(rong)(rong)(rong)處(chu)(chu)理。鋼(gang)(gang)(gang)(gang)板(ban)(ban)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)率：ε＝１．５δ／２Ｒ（２）式中(zhong) δ———鋼(gang)(gang)(gang)(gang)板(ban)(ban)的(de)(de)(de)(de)(de)(de)名義厚度(du)(du)(du)，ｍｍ； Ｒ———鋼(gang)(gang)(gang)(gang)板(ban)(ban)彎(wan)曲變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)后(hou)的(de)(de)(de)(de)(de)(de)中(zhong)性(xing)半徑，ｍｍ。固(gu)溶(rong)(rong)(rong)(rong)處(chu)(chu)理后(hou)再進行金(jin)相(xiang)(xiang)檢驗，對(dui)(dui)于(yu)方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)鐵(tie)(tie)(tie)素體(ti)(ti)含量５０％～５５％為(wei)最佳。方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)強度(du)(du)(du)高，表(biao)面(mian)(mian)(mian)應力(li)(li)(li)大(da)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)作(zuo)用(yong)力(li)(li)(li)大(da)，表(biao)面(mian)(mian)(mian)缺(que)陷容易(yi)誘發開裂(lie)；因(yin)此(ci)材料(liao)(liao)表(biao)面(mian)(mian)(mian)應做表(biao)面(mian)(mian)(mian)檢測(ce)，并消除(chu)表(biao)面(mian)(mian)(mian)缺(que)陷。鐵(tie)(tie)(tie)素體(ti)(ti)相(xiang)(xiang)會使工(gong)件冷(leng)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)仍(reng)具(ju)有方(fang)(fang)(fang)向性(xing)，成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)直邊余量不(bu)(bu)(bu)(bu)等，建議下(xia)(xia)(xia)料(liao)(liao)尺寸應比不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)略大(da)。 熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)要(yao)求 方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)熱(re)(re)加(jia)工(gong)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)(cheng)中(zhong)要(yao)控(kong)制(zhi)好始壓溫(wen)(wen)(wen)度(du)(du)(du)和(he)終(zhong)壓溫(wen)(wen)(wen)度(du)(du)(du)，為(wei)了避免(mian)產(chan)生脆(cui)化(hua)現(xian)象(xiang)，如(ru)(ru)方(fang)(fang)(fang)形(xing)(xing)(xing)(xing)(xing)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)管(guan)(guan)應在(zai)(zai)１２３０～１０２５℃范圍(wei)內(nei)(nei)進行熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作(zuo)，熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)立即進行固(gu)溶(rong)(rong)(rong)(rong)處(chu)(chu)理。如(ru)(ru)果(guo)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)太低(di)，變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)就會聚(ju)集在(zai)(zai)較(jiao)弱而(er)且塑性(xing)較(jiao)差的(de)(de)(de)(de)(de)(de)鐵(tie)(tie)(tie)素體(ti)(ti)，結果(guo)造成(cheng)(cheng)(cheng)鐵(tie)(tie)(tie)素體(ti)(ti)在(zai)(zai)變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)區的(de)(de)(de)(de)(de)(de)嚴重開裂(lie)。如(ru)(ru)果(guo)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)太高，則鐵(tie)(tie)(tie)素體(ti)(ti)變(bian)(bian)得非常軟且可能(neng)發生熱(re)(re)撕裂(lie)。實際的(de)(de)(de)(de)(de)(de)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)應在(zai)(zai)給定的(de)(de)(de)(de)(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)范圍(wei)進行，因(yin)為(wei)鐵(tie)(tie)(tie)素體(ti)(ti)和(he)奧氏體(ti)(ti)都有良好的(de)(de)(de)(de)(de)(de)熱(re)(re)塑性(xing)；因(yin)此(ci)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)工(gong)藝中(zhong)控(kong)制(zhi)溫(wen)(wen)(wen)度(du)(du)(du)范圍(wei)及溫(wen)(wen)(wen)度(du)(du)(du)均勻是一個難(nan)點(dian)。 ２５０７不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作(zuo)中(zhong)應注意以下(xia)(xia)(xia)幾點(dian)： （１）由(you)于(yu)雙(shuang)相(xiang)(xiang)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)室(shi)溫(wen)(wen)(wen)強度(du)(du)(du)高，扭曲變(bian)(bian)形(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)(de)(de)產(chan)品再成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)或矯直比奧氏體(ti)(ti)不(bu)(bu)(bu)(bu)銹(xiu)(xiu)鋼(gang)(gang)(gang)(gang)困難(nan)，因(yin)此(ci)在(zai)(zai)固(gu)溶(rong)(rong)(rong)(rong)溫(wen)(wen)(wen)度(du)(du)(du)下(xia)(xia)(xia)，對(dui)(dui)薄(bo)壁、大(da)口(kou)徑工(gong)件設置足夠(gou)的(de)(de)(de)(de)(de)(de)支撐十分必要(yao)。 （２）４７５℃脆(cui)化(hua)區一般會在(zai)(zai)３５０～５２５℃溫(wen)(wen)(wen)度(du)(du)(du)范圍(wei)內(nei)(nei)出(chu)現(xian)，因(yin)此(ci)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)操作(zuo)中(zhong)嚴格(ge)禁止在(zai)(zai)此(ci)溫(wen)(wen)(wen)度(du)(du)(du)范圍(wei)內(nei)(nei)作(zuo)業。 （３）坯料(liao)(liao)加(jia)熱(re)(re)出(chu)爐后(hou)溫(wen)(wen)(wen)度(du)(du)(du)下(xia)(xia)(xia)降(jiang)迅速，散熱(re)(re)快(kuai)，很(hen)快(kuai)可達脆(cui)化(hua)區；因(yin)此(ci)出(chu)爐至成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)時(shi)間應盡量縮短(duan)，封頭成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)脫模(mo)溫(wen)(wen)(wen)度(du)(du)(du)不(bu)(bu)(bu)(bu)應低(di)于(yu)９５０℃。熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)過(guo)程(cheng)(cheng)中(zhong)建議對(dui)(dui)溫(wen)(wen)(wen)度(du)(du)(du)進行嚴格(ge)監控(kong)。 （４）坯料(liao)(liao)在(zai)(zai)加(jia)熱(re)(re)過(guo)程(cheng)(cheng)中(zhong)，當溫(wen)(wen)(wen)度(du)(du)(du)低(di)于(yu)６００℃時(shi)可以適當減(jian)小加(jia)熱(re)(re)速率，溫(wen)(wen)(wen)度(du)(du)(du)升至８００℃左右(you)時(shi)加(jia)熱(re)(re)速率可以適當提高。 （５）由(you)于(yu)熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)會使材料(liao)(liao)金(jin)相(xiang)(xiang)失(shi)去相(xiang)(xiang)平(ping)衡，進而(er)影響材料(liao)(liao)的(de)(de)(de)(de)(de)(de)力(li)(li)(li)學(xue)性(xing)能(neng)和(he)耐腐蝕(shi)性(xing)能(neng)。熱(re)(re)成(cheng)(cheng)(cheng)形(xing)(xing)(xing)(xing)(xing)后(hou)應立即進行固(gu)溶(rong)(rong)(rong)(rong)熱(re)(re)處(chu)(chu)理。
方(fang)(fang)形(xing)不(bu)(bu)銹(xiu)鋼(gang)管(guan)價(jia)格(ge)市(shi)場(chang)期(qi)(qi)盼(pan)中(zhong)國(guo)啟動(dong)新(xin)一輪刺(ci)激，然而此(ci)(ci)前中(zhong)國(guo)財(cai)政部(bu)長樓繼偉(wei)周末在(zai)G20峰(feng)會上(shang)說(shuo)：“在(zai)提高基礎設施建設投資上(shang)，中(zhong)國(guo)不(bu)(bu)能(neng)依賴政府(fu)開(kai)支”。于此(ci)(ci)同時(shi)，北(bei)戴河會議(yi)顯示中(zhong)國(guo)最(zui)高領導層(ceng)并接(jie)受了經濟增(zeng)幅(fu)可(ke)(ke)能(neng)低(di)于7.5%目標的“新(xin)常態”，這意味著大規模刺(ci)激近期(qi)(qi)不(bu)(bu)太可(ke)(ke)能(neng)發生。 國(guo)產礦(kuang)(kuang)方(fang)(fang)面(mian)，下游鋼(gang)坯及成材(cai)下挫(cuo)，外礦(kuang)(kuang)重新(xin)步入下跌(die)通(tong)道，受此(ci)(ci)影(ying)響(xiang)，熱鍍(du)鋅圓(yuan)鋼(gang)廠開(kai)始(shi)新(xin)一輪打壓礦(kuang)(kuang)價(jia)，方(fang)(fang)形(xing)不(bu)(bu)銹(xiu)鋼(gang)管(guan)價(jia)格(ge)市(shi)場(chang)交投清淡，看空氛圍濃郁，預(yu)計短期(qi)(qi)內(nei)礦(kuang)(kuang)價(jia)將繼續(xu)走(zou)(zou)弱(ruo)。市(shi)場(chang)平穩(wen)運行，鋼(gang)企(qi)焦(jiao)炭(tan)庫(ku)(ku)存較(jiao)平穩(wen)，開(kai)工率(lv)持續(xu)高走(zou)(zou)帶動(dong)焦(jiao)炭(tan)需求(qiu)轉(zhuan)好，焦(jiao)企(qi)庫(ku)(ku)存普遍偏低(di)甚至零庫(ku)(ku)存，供(gong)(gong)需面(mian)基本(ben)沒(mei)有(you)壓力，目前有(you)個別鋼(gang)企(qi)與供(gong)(gong)應(ying)商口頭溝通(tong)降(jiang)價(jia)提議(yi)，雖(sui)有(you)降(jiang)價(jia)要求(qiu)出現(xian)，但(dan)受上(shang)游煉焦(jiao)煤成本(ben)價(jia)格(ge)支撐，焦(jiao)化企(qi)業(ye)短期(qi)(qi)內(nei)難(nan)以接(jie)受該要求(qiu)，在(zai)國(guo)慶節前焦(jiao)炭(tan)價(jia)格(ge)難(nan)出現(xian)下跌(die)行情，短期(qi)(qi)方(fang)(fang)形(xing)不(bu)(bu)銹(xiu)鋼(gang)管(guan)價(jia)格(ge)持穩(wen)可(ke)(ke)能(neng)性(xing)較(jiao)大。
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鄭重承諾，在同等(deng)的(de)質量下，保證以最低的(de)價(jia)格，最完(wan)善的(de)服務(wu)，最高(gao)的(de)信(xin)譽來答(da)謝(xie)各界(jie)朋友的(de)支(zhi)持與厚(hou)愛。歡(huan)迎垂詢光臨(lin)！
方形不銹鋼管詢價明顯減少，價格穩中有降