Ubushushu obuphantsiumbhobho wentsimbi yekhabhoniyintsimbi ye-carbon structural, i-low heat ye-carbon steel pipe iqhutywe kwimeko yokushisa ephantsi, enokumelana nefuthe elithile lobushushu obuphantsi, ukusebenza komatshini kungcono, kwaye ixabiso liphantsi, umthombo obanzi, osetyenziswa ngokubanzi.Ubuthathaka bayo obukhulu bubunzima obuphantsi, ubungakanani becandelo leemfuno eziphezulu zaseJapan zomsebenzi akufanele zisetyenziswe.
Ubushushu obuphantsi carbon steel umbhobho ukucima iqondo lobushushu A3 + (30 ~ 50) ℃, ngokusebenza, idla ibekwe kumda ophezulu.Umbhobho wokushisa wokucima ubushushu obuphezulu unokwenza isantya esiphantsi, ukunciphisa i-oxidation yomhlaba, kwaye unokuphucula ukusebenza kakuhle.I-workpiece yi-uniform austenite, iya kufuna ixesha elaneleyo lokubamba.Ukuba umthamo wangempela wesithando somlilo, kuya kufuneka ukuba ufanelekile ukwandisa ixesha lokubamba.Ngaphandle koko, kunokubakho ubunzima obaneleyo ngenxa yokufudumeza okungalinganiyo okubangelwa yinto.Nangona kunjalo, ixesha lokubamba lide kakhulu, liya kubonakala kwakhona iinkozo ezirhabaxa, i-oxidation kunye ne-decarbonization yeengxaki ezinzulu ezichaphazela umgangatho wokucima.Sikholelwa ukuba ukuba i-furnace efakiweyo inkulu kunamaxwebhu enkqubo, ukufudumeza ixesha lokubamba ukuba kwandiswe 1/5.Umbhobho ophantsi we-carbon steel pipe ngenxa yokuqina okuphantsi, kufuneka wamkele izinga lokupholisa elikhulu le-10% yesisombululo setyuwa.I-workpiece emanzini, kufuneka ibe lukhuni, kodwa ayigodoli, ukuba i-45 # echanekileyo yentsimbi epholileyo kwi-brine, kunokwenzeka ukuqhekeka kwe-workpiece, oku kungenxa yokuba xa i-workpiece ipholile ukuya malunga ne-180 ℃, i-austenite iguqulelwa ngokukhawuleza kumzimba wehashe. izicubu ezibangelwa luxinzelelo olugqithisileyo ngenxa.Ngoko ke, xa intsimbi yokucima kunye neyokufudumala ipholile ngokukhawuleza kolu luhlu lobushushu, indlela kufuneka ithathwe ukupholisa ngokukhawuleza.Njengoko ubushushu bamanzi kunzima ukubuqonda, amava anoxanduva lokusebenza, xa amanzi eyeka ukudiza izinto zakudala, unokunkcenkceshela aphole (umz. isipholile se-oyile sinokuba ngcono).Ukongezelela, i-workpiece emanzini, isenzo esifanelekileyo kufuneka siqhubeke ngokuhambelana nejometri ye-workpiece, njengokuzivocavoca rhoqo.Indawo yokupholisa emileyo kunye nesixhobo sokusebenza esimileyo, esikhokelela kubunzima obungalinganiyo, uxinzelelo olungalinganiyo lushiya inguqu enkulu yendawo yokusebenza, kunye nokuqhekeka.
Ilungu eliphantsi lobushushu bekhabhoni yentsimbi yombhobho wacima ubulukhuni emva kokucima kufuneka ufike kwi-HRC56 ~ 59, ukubakho kwecandelo elikhulu elinqamlezayo elisezantsi, kodwa lingekho ngaphantsi kwe-HRC48, kungenjalo, libonisa ukuba i-workpiece ayizange iqiniswe ngokupheleleyo, umbutho unokuba yi-ferrite okanye i-sorbite. izicubu, imibutho enjalo ngokuthambisa, isagcinwe kwi-matrix, engazange icinywe iinjongo.Umbhobho wentsimbi yekhabhoni ephantsi ukufudumala emva kokucima, ubushushu bokufudumala buhlala bungama-560 ~ 600 ℃, ubulukhuni yi-HRC22 ~ 34.Kodwa ukuzoba iimfuno zobunzima, kuyimfuneko ukulungelelanisa ubushushu bokufudumala ngokwemizobo ukuqinisekisa ubulukhuni.Njengoko ezinye iishafu zentsimbi ezibandayo zifuna amandla aphezulu, ukuqina kuphezulu;ngelixa ezinye iindawo zeshafti yesitshixo segiya, kuba nasemva kokuba kucinywa ukugaya, faka ukusetyenzwa, iimfuno zobulukhuni ezisezantsi.Malunga Tempering ixesha, ngokuxhomekeke ubulukhuni kunye nobungakanani workpiece, sikholelwa, kuxhomekeke ubulukhuni emva tempering ubushushu kunye nokuqukumbela ixesha elincinane, kodwa kufuneka ibuyiselwe ngokusebenzisa jikelele rhoqo umsebenzi Tempering Ixesha iyure enye okanye ngaphezulu.