小口徑無縫鋼管的外徑可稱為小口徑無縫鋼管,小口徑無縫鋼管又可分為:小口徑無縫鋼管和直縫(也可稱為焊接)小口徑無縫鋼管,一般在外徑不到89 mm的鋼管中,4 mm以上;可統稱為小口徑無縫鋼管。
淬(cui)(cui)火(huo)(huo)(N,又被(bei)稱為(wei)(wei)常化(hua)):將無(wu)(wu)縫(feng)鋼管加溫到淬(cui)(cui)火(huo)(huo)熱度(du),使無(wu)(wu)縫(feng)鋼管里面機(ji)構變化(hua)為(wei)(wei)奧氏(shi)體(ti)(ti)(ti)(ti)機(ji)構之(zhi)后(hou)(hou),以氣體(ti)(ti)(ti)(ti)為(wei)(wei)媒(mei)質開展制冷(leng)的熱處(chu)理方法。淬(cui)(cui)火(huo)(huo)后(hou)(hou)可得(de)到不(bu)(bu)一(yi)樣的金屬材料機(ji)構,如(ru)鐵(tie)素(su)體(ti)(ti)(ti)(ti)、馬氏(shi)體(ti)(ti)(ti)(ti)、奧氏(shi)體(ti)(ti)(ti)(ti)或(huo)是(shi)他們的混(hun)和機(ji)構。淬(cui)(cui)火(huo)(huo)不(bu)(bu)但能夠 優(you)化(hua)晶體(ti)(ti)(ti)(ti)、勻稱成份、應力(li),還能夠提(ti)升無(wu)(wu)縫(feng)鋼管的硬度(du)標(biao)準并改進(jin)其加工(gong)性。
淬(cui)火工(gong)(gong)(gong)藝:將無縫鋼(gang)(gang)管加(jia)溫(wen)到正火溫(wen)度(du)并(bing)隔熱(re)保溫(wen)相應(ying)(ying)時間段之后(hou),隨爐遲緩制冷到相應(ying)(ying)熱(re)度(du)后(hou)再新(xin)鮮出爐制冷的一類熱(re)處理(li)方(fang)法(fa)。無縫鋼(gang)(gang)管淬(cui)火工(gong)(gong)(gong)藝可分成:去應(ying)(ying)力退火、淬(cui)火工(gong)(gong)(gong)藝、去應(ying)(ying)力淬(cui)火工(gong)(gong)(gong)藝等。
小口徑無縫(feng)鋼管(guan)淬火工(gong)(gong)藝(yi)的(de)關鍵功效:①減少(shao)無縫(feng)鋼管(guan)的(de)硬(ying)度標準(zhun),提升(sheng)其(qi)塑(su)性(xing)變形,以便于事(shi)后(hou)的(de)車削生產加工(gong)(gong)或(huo)冷(leng)變型生產加工(gong)(gong);②優化晶(jing)體,機(ji)構缺點,勻稱里面機(ji)構和(he)成份,改進無縫(feng)鋼管(guan)的(de)性(xing)能指標或(huo)為事(shi)后(hou)工(gong)(gong)藝(yi)流程(cheng)做準(zhun)備;③無縫(feng)鋼管(guan)的(de)應力,以避免 變型或(huo)裂開。