izindaba

Precision ipayipi elikhanyayo uhlobo lwensimbi ephezulu yensimbi ecutshungulwa ngokudwetshwa okuhle noma ukubanda okubandayo.Ngokuba udonga lwangaphakathi nolwangaphandle lwethubhu elikhanyayo alinaso isendlalelo se-oxidation, akukho ukuvuza ngaphansi kwengcindezi ephezulu, ukunemba okuphezulu, ukuphela okuphezulu, akukho ukusilela ekubhekeni okubandayo, ekubhebhethekeni, ekubambeni nasekukhohleni, njll., kusetshenziselwa kakhulu ukukhiqiza imikhiqizo yezakhi zomoya noma ze-hydraulic, njenge-cylinder noma isilinda, kungaba yisithubhu esingenamthungo, kukhona nepayipi elishiselwe. ukucacisa ithubhu ekhanyayo kufaka phakathi u-C, Si, Mn, S, P, Cr.
Precision

Isingeniso se-1

Ikhwalithi ephezulu yekhabhoni yensimbi, ukugoqa okuhle, ukwelashwa kokushisa okukhanyayo okukhanyayo (izwe le-NBK), ukuhlolwa okungenakuqothula, udonga lwangaphakathi lwepayipi lensimbi lukhucululwa yimishini ekhethekile futhi igezwe ngomfutho ophakeme, ipayipi lensimbi liphathwa ngamafutha antirust, futhi yomibili imikhawulo yesembozo iphathwa ngokungavimbeli uthuli.

 

2.Izici eziyinhloko:

Udonga lwangaphakathi nolwangaphandle lwepayipi lensimbi lunokunemba okuphezulu nokuqeda okuphezulu. Ngemuva kokwelashwa kokushisa, ipayipi lensimbi alinayo ungqimba lwe-oxidation, futhi udonga lwangaphakathi lunokuhlanzeka okuphezulu. Ipayipi lensimbi lithwala umfutho ophakeme, alikhubeki ekugoqeni okubandayo, futhi alinaso isigaxa sokuvutha nokuthambile.Umbala wensimbi yensimbi: okumhlophe okumhlophe okukhanyayo, okunokucwebezela okuphezulu kwensimbi.

Inhloso enkulu

Izimoto, izingxenye zemishini, njll., Ezinokudingeka okuphezulu kokunemba nokuqedwa kwabasebenzisi bamapayipi wensimbi.Abasebenzisi bensimbi yokulungisa kahle akuyona nje eyokunemba, izidingo ezibushelelezi ngabasebenzisi abaphezulu, ngenxa yokunemba okuphezulu kwepayipi elikhanyayo, ukubekezelelana kungaba inakekelwa ngocingo olungu-2-8, abasebenzisi abaningi bokucubungula imishini ukuze basindise abasebenzi, izinto ezibonakalayo, ukulahleka kwesikhathi, ipayipi lensimbi elingenamthungo noma insimbi eyindilinga iguqulwa kancane kancane ibe yipayipi elikhanyayo elikhanyayo.

 

4.Ubumnene bomoya

Ngemuva kokucima isakhiwo se-martensite, ishubhu elikhanyayo elicwengekileyo lalinganiselwe ebangeni lokushisa elingu-450 ~ 600 ℃ .Okanye ku-650 ℃ ngemuva kokufiphaza ngesilinganiso sokupholisa esisheshayo ngemuva kuka-350 ~ 600 ℃; Noma ngemuva kokushisa ku-650 ℃, ukufudumeza isikhathi eside ebangeni lokushisa elingu-350 ~ 650 ℃ lenza into eqondile yepayipi le-embrittlement. Uma i-embrittled 20 # precision steel pipe ifudunyezwa ibe ngu-650 ℃ bese ipholile masinyane, ingabuyisa ukuqina, ngakho-ke yaziwa nangokuthi% 26ldquo; Ukubuyisa intukuthelo brittleness% 26rdquo; Ubulukhuni bethempelesha ephezulu ubulukhuni bokunemba okucacile ithubhu kanye nokwanda kokushisa okuguqukayo kokushisa.ukushisa okuphezulu okushisa.ukuzwela ngokuvamile kuchazwa njengomehluko phakathi kwamazinga okushisa e-ductile kanye ne-brittle change (% 26Delta; T) ukusho.ukuphakama kobukhulu bokushisa okushisa kakhulu, kuyanda ingxenye ukwaphuka kwemisipha ekuhlukaneni kwesibhubhu esikhanyayo ngokunemba.

Umphumela wezinto kuthubhu ekhanyayo eqondile kubukhulu bokushisa obushisayo buhlukaniswe :( 1) izinto zokungcola ezifana ne-phosphorus, i-tin, i-antimony nokunye okubangela ukushisa okuphezulu okushisa kwe-tube ekhanyayo. (2) Izakhi ezihlanganisa izinto ezithuthukisa noma ezinciphisa izinga lokushisa eliphakeme lokushisa ngezindlela ezahlukahlukene nakumazinga ahlukene I-chromium, i-manganese, i-nickel, i-silicon njalonjalo idlala indima ekukhuthazeni, kuyilapho i-molybdenum, i-tungsten, i-titanium nokunye kudlala indima yokubambezeleka. I-Carbon nayo idlala indima ethile. Izinga lezinsimbi ze-alloy kanambambili noma ze-multicomponent alloy eziqukethe i-chromium, i-manganese, i-nickel ne-silicon yehlukile ngohlobo nokuqukethwe kwezinto ezixubayo.

Izinga elibucayi le-microstructure yasekuqaleni yeshubhu elikhanyayo elicwengekileyo ekushiseni okuphezulu kwensimbi okushisa ngokusobala lihlukile.Isakhiwo se-tempensite high tempering tempering yisona esibucayi kakhulu ekushiseni okushisa okushisa kakhulu, isakhiwo se-tempering lokushisa okuphezulu yi-second, pearlite isakhiwo sincane.

Ingqikithi yokushisa okushisa okuphezulu kwe-tube eqondile ekhanyayo ngokuvamile kukholakala ukuthi kungumphumela wokuhlanganiswa kwemingcele okusanhlamvu okubangelwe ukwehlukaniswa kwezinto ezingcolile ezifana ne-P, Sn, Sb kanye ne-As emngceleni wokuqala wokusanhlamvu we-austenite. , i-nickel, i-chromium nezinye izinto ezixubene nalezi zinto ezingenhla zokungcola kwenzeka emngceleni wezinhlamvu, okhuthaza ukunothiswa kwezinto zokungcola futhi kusheshise ukubethelwa.Ngokuphikisana nalokho, i-molybdenum inokuxhumana okuqinile nezinto ezingcolile ezifana ne-phosphorus, engakhiqiza nciphisa isigaba okusanhlamvu futhi kuvimbele ukwehlukaniswa komngcele we-phosphorus, futhi kunganciphisa izinto ezinomhlaba ezingavamile ezinamazinga okushisa aphakeme.I-T ingathuthukisa ngokuphumelelayo imvula yezinto ezingcolile ezifana ne-phosphorus okusanhlamvu, ngaleyo ndlela yenze ukwehlukaniswa kwemingcele okusanhlamvu wezinto zokungcola futhi wehlise ijubane le-brittleness emazingeni aphezulu okushisa.

Izindlela zokwehlisa ubulukhuni bokushisa okushisa okuphezulu kwamashubhu akhanyayo zimi kanje :(1) ngemuva kokushisa okushisa okuphezulu, ukupholisa ngamafutha noma ukupholisa ngokushesha ngamanzi ukuvimbela ukwahlukaniswa kwezinto ezingcolile emingceleni yezinhlamvu; (2) Lapho okuqukethwe kwe-molybdenum ensimbi kukhuphukela ku-0.7%, ukuthambekela kokushisa okushisa kakhulu kuncishiswe kakhulu. Lapho okuqukethwe kwe-molybdenum ensimbi kudlula lo mkhawulo, ama-carbide akhethekile acebile ku-molybdenum akhiwa ku-20 # precision steel pipe. Lapho okuqukethwe kwe-molybdenum kumatrix kuncipha, ukuthambekela kokufakwa ngaphakathi kwepayipi elikhanyayo kuyanda. (3) ukunciphisa okuqukethwe kwezinto zokungcola ku-20 # precision steel pipe; (4) Okwezingxenye ezisebenza endaweni eshisa kakhulu endaweni isikhathi eside, kunzima ukuvimbela ukufakwa ngokungeza i-molybdenum yodwa. Kuphela ngokunciphisa okuqukethwe kwezinto zokungcola ku-20 # ngokunemba kwensimbi yensimbi, ukuthuthukisa ubumsulwa bokunemba kweshubhu elikhanyayo, futhi ukukugcwalisa ngokuhlanganiswa kwe-aluminium nezinto ezingavamile zomhlaba, lapho ukuvinjelwa kokushisa okuphezulu kungavinjelwa ngempumelelo.

Precision-2

5.Isimo sokulethwa kwempahla esijwayelekile

Indinganiso Main: GB / T3639, DIN2391-94 / C, DIN2445, EN10305, DIN1630, DIN1629, ASTM A106, ASTM A179, JIS G3445

Izinto eziyinhloko: 10 #, 20 #, 35,45,40 Cr, 25 mn. I-37 mn5, St35 (E235), St37.4, St45 (E255), St52 (E355)

Isimo sokulethwa okuyisisekelo: NBK (+ N), GBK (+ A), BK (+ C), BKW (+ LC), BKS (+ SR)


Isikhathi Iposi: Apr-01-2021