I-China ASTM A681 D7 Ithuluzi Lebha Yensimbi Umkhiqizi kanye Nomhlinzeki
I-D7 Tool Steel iyinsimbi ephezulu ye-carbon, ephezulu ye-chromium eqinisa umoya enokumelana okuhle nokugqokwa.
Lokhu kumelana nokugqokwa kungenxa yokuqukethwe kwayo okuphezulu kwekhabhoni ne-vanadium, okwakha izinhlayiya eziningi eziqinile ze-vanadium carbide ensimbi, enobulukhuni obulingana no-80 kuya ku-85 i-Rockwell C.
Lesi sakhiwo senza insimbi yensimbi ye-D7 isebenze kahle ekumelaneni nokuguga lapho ithintana nezinsimbi ezishelelayo futhi ithinta udaka olomile noma olumanzi lwezinhlayiya ezihuquzelayo eziqinile njengesihlabathi, imidiya eqhumayo nezitsha zobumba.
Insimbi yensimbi ye-D7 isetshenziswa kakhulu, ikakhulukazi kufaka phakathi isikhunta sezitini, isikhunta se-briquetting, izintambo zemishini yokudubula, i-ceramic extrusion kanye namathuluzi okwakha, amathuluzi okuhlanganisa impushana, umdwebo ojulile uyafa, ama-roller alulazayo nama-rails omhlahlandlela wamathuluzi omshini, njll.
Kulezi zimo zohlelo lokusebenza, ukumelana nokugqokwa, ubulukhuni nokuqina kwensimbi yensimbi ye-D7 kusetshenziswa ngokugcwele.
Mayelana nokwelashwa kokushisa, inqubo yokuqina ye-D7 insimbi yensimbi idinga izinyathelo ezifana nokushisa ngaphambili, i-austenitization (izinga lokushisa eliphezulu) kanye nokushisa.
Izinga lokushisa elijwayelekile lingu-300°F (149°C) ukuze likwazi ukumelana nokugqoka okuphezulu. Futhi, ukuze kube nokuqina okukhulu, ukuthukuthela okuphindwe kabili kungenziwa futhi, ubambe ezingeni lokushisa elingaphezu kuka-950°F (510°C) amahora amabili bese ubamba amanye amahora amabili.
Ngokusebenza kokusika, ukusebenza kokusika kwensimbi yensimbi ye-D7 cishe ku-30-35% ye-1% carbon steel. Lokhu kusho ukuthi amathuluzi afanele kanye namasu adingekayo ngesikhathi sokwenza imishini ukuze kuqinisekiswe ikhwalithi enhle nokusebenza kahle kwemishini.
Ngokuvamile, insimbi yensimbi ye-D7 iyinsimbi yensimbi esebenza kahle engagugi efanelekile izimo ezihlukahlukene zohlelo ezidinga ukumelana nokuguga nomthelela.
Ukumelana kwayo okuhle kakhulu nokugqoka, ubulukhuni nokuqina, kanye nokucutshungulwa okuhle kokusika, kuyenza isetshenziswe kabanzi ekukhiqizeni izimboni.
Insimbi yensimbi ye-D7 iyinsimbi yekhwalithi ephezulu yekhabhoni, ephezulu ye-chromium alloy ethatha isikhundla esibalulekile ekukhiqizweni kwezimboni ngenxa yezakhiwo zayo ezinhle kakhulu zomzimba namakhemikhali. Lesi sihloko sihlose ukucacisa imininingwane yensimbi ye-D7 kanye nokusetshenziswa kwayo okuyinhloko.
Izici eziyinhloko ze-D7 Tool Steel
Ukuqina okuphezulu nokumelana nokugqoka okuqinile: Ngemuva kokwelashwa okufanele kokushisa, insimbi ye-D7 ingafinyelela ubulukhuni obuphakeme kakhulu, inikeze ukumelana nokugqokwa okuhle kakhulu.
Lesi sici senzaD7 insimbiezinhle kakhulu ezindaweni zokusebenza ezingaphansi kwemithwalo ephezulu kanye nokungqubuzana kwesivinini esikhulu.
Ukumelana nomthelela: Ngenxa yokuqina kwayo okuphezulu nokuqina okuhle, insimbi yensimbi ye-D7 inokumelana nomthelela omuhle futhi iyakwazi ukugcina ubuqotho besakhiwo lapho ithintwa amandla angaphandle.
Ukumelana nokugqwala: Insimbi yensimbi ye-D7 iqukethe inani elithile le-chromium, elivumela ukuthi ligcine ukuzinza okuhle nokuqina kwezinye izindawo ezigqwalayo.
Uyini umehluko phakathi kwensimbi yensimbi ye-D7 ne-D2?
Insimbi yensimbi ye-D7 kanye nensimbi yethuluzi le-D2 (eyaziwa nangokuthi i-Cr12MoV) yizinsimbi zamathuluzi ezimbili ezihlukene, ngayinye enezici ezihlukile nezindlela zokusebenza.
I-D7 Tool Steel iyinsimbi ephezulu ye-carbon, ephezulu ye-chromium eqinisa umoya enokumelana okuhle nokugqokwa. Ikhabhoni ephezulu kanye ne-vanadium okuqukethwe kwayo kuphumela enanini elikhulu lezinhlayiya eziqinile ze-vanadium carbide ensimbi, ezinobunzima obulingana no-80 kuya ku-85 i-Rockwell C.
Ngakho-ke, imelana ngokuphumelelayo nokuguga okubangelwa ukuthintana ngokuslayida nezinye izinsimbi kanye nokuxhumana okunodaka okomile nokumanzi nezinhlayiya eziqinile ezilumayo njengesihlabathi, imidiya eqhumayo edubulayo kanye ne-ceramics. Lokhu kwenza insimbi yensimbi ye-D7 ifaneleke ukusetshenziswa okuhlukahlukene, okuhlanganisa isikhunta sezitini, i-briquetting dies, i-lining yemishini yokudubula, i-ceramic extrusion kanye namathuluzi okwenza, amathuluzi okuhlanganiswa kwempushana, umdwebo ojulile uyafa, ama-roller alulazayo nama-rails omhlahlandlela wamathuluzi womshini.
Insimbi yamathuluzi e-D2 (i-Cr12MoV) futhi iyinsimbi yensimbi enekhabhoni ephezulu, ephezulu ye-chromium enokuqina okuhle kakhulu, ukumelana nokugqokwa, ukumelana nokugqwala kanye nokumelana nokuguga. Okuqukethwe kwekhabhoni yayo kuphezulu njengo-1.40% -1.60%, okuthuthukisa ubulukhuni bayo nokumelana nokugqoka.
Ngesikhathi esifanayo, insimbi nayo inokuqukethwe okuphezulu kwe-chromium ne-molybdenum, okungathuthukisa ngempumelelo ukumelana kwayo nokugqwala.
Insimbi yensimbi ye-D2 ingathola izici ezinhle kakhulu zokulungisa nobulukhuni ngezinqubo zokwelashwa kokushisa njengokucisha kanye nokushisa, futhi inekhono elihle lokuhlangabezana nezidingo zemishini ehlukahlukene. Lezi zakhiwo zenza insimbi yensimbi ye-D2 isetshenziswe kabanzi ekwenzeni izingxenye ezisezingeni eliphezulu njengezikhunta, amathuluzi okusika kanye nokufakela.
Ibha eyindilinga yensimbi ye-D7
Ukwakheka kwamakhemikhali(ingxenyana yobuningi)(wt.%) yensimbi yethuluzi le-D7
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | I-Mo(％) | V(%) |
| 2.15–2.50 | 0.10-0.60 | 0.10-0.60 | ≤0.030 | ≤0.030 | 11.5-13.5 | 0.70-1.20 | 3.80-4.40 |
I-ASTM A681-US
I-FED QQ-T-570-US
I-SAE J437-US
I-SAE J438-US
I-UNS T30407-US
I-AISI D7 Tool Steel-US
Inketho yokuncibilika kwe d7
1 EAF: Isithando somlilo se-Electric Arc
2 I-EAF+LF+VD: Ukuncibilika okucolisisiwe nokususa umoya nge-vacuum
3 EAF+ESR: Electro Slag Remelting
4 EAF+PESR: umoya ovikelayo I-Electro Slag Remelting
5 VIM+PESR: Ukuncibilika kokufakwa kwevacuum
Ukubumba Inketho kwe-D7 Steel
1 Inqubo yokugoqa eshisayo
2 I-Hot Forging: Electro-hydraulic; High-speed-hydraulic; Amafutha-hydraulic; Ukunemba-ukuqamba
Inketho yokwelapha ukushisa kwe d7 insimbi
1 +A: I-Annealed (igcwele/ithambile/i-spheroidizing)
2 +N: Kwenziwa ngokujwayelekile
I-3 +NT: Ijwayelekile futhi iqinile
I-4 +QT: Icinywe futhi ithambile (amanzi/amafutha)
Inketho ye-Suface Yensimbi Yensimbi
1 Indawo Emnyama
2 Iphansi: Ikhanya kodwa ilukhuni; Hhayi ukunemba
3 Ukukhanda ipuleti: Kukhanya futhi kunembile; Isibazi esincane esiphendukayo
4 Kuhlutshiwe/Kuphendulwe: Kuyakhanya nokunemba; Isibazi esincane esiphendukayo
5 Kupholishiwe: Usayizi ogqamile futhi onembayo; Hhayi ukuphenduka isibazi
IZIMPAHLA ZEMITHETHO OF ITHULUSI LEZINDLU D7
| Veza I-Rp0.2 (MPa) | I-tensile Rm (MPa) | Umthelela I-KV/Ku (J) | Ukwelula A (%) | Ukwehliswa kwesigaba esiphambene ekuqhekekeni Z (%) | Isimo Sokuphathwa Kokushisa | Ukuqina kwe-Brinell (HBW) |
| 984 (≥) | 682 (≥) | 41 | 31 | 23 | Isixazululo kanye Nokuguga, Annealing, Ausaging, Q+T, njll | 322 |
| Imikhiqizo | Ububanzi(mm) | Ubude(mm) |
| Ibha Egingqiwe | 10-95 | 3000 ~ 5700 |
| Indawo yokuphuzela utshwala | 95 ~ 440 | 3000 ~ 5700 |
| Ibhilidi | 130×130,140×140,150×150,160×160 | 7000Ubuningi |
