1. Cov khoom txhais thiab cov khoom tseem ceeb
Q: Dab tsi yog ovm 519 4720 cov yeeb nkab?
A:
4720 cov yeeb nkab steel yog npib tsib xee-molybdenum carburized alloy steel seamless yeeb (uns g47200) teev nyob rau hauv Astm ATTM A519 tus qauv. Nws cov tub ntxhais muaj pes tsawg leeg yog: 0.17% -0.222% carbon, 0.70% -1.00% npib tsib, 0.70% -0.55% molybdenum. Cov khoom siv no, ntxiv dag zog los ntawm Molybdenum carbides thiab txhim kho los ntawm npib tsib thiab chromium hardness (cov ntaub ntawv nyuaj (tseem ceeb tshaj plaws rau lub zog loj dua los yog sib npaug rau 55j). Nws muaj ib qho kev tsim kho cov ntsiab lus Austenite (12% -18%) Tom qab carburizes thiab sib luag rau high-precision, hnyav-loaded iav Cheebtsam.
2. Cov Khoom Siv Cov Neeg Kho Tshuab thiab Cov Lus Qhia
Q: Qhov ntsuas tau ua tiav ntawm 4720 cov yeeb nkab steel?
A:
Nyob rau hauv carburized, quenched, thiab tsawg-kub lub xeev:
Cov Khoom Nto: Hardness Hrc 60-64, tiv tauj kev qaug zog tau suav ntau dua lossis sib npaug rau 2000 MPa
Cov Khoom Siv: Tensile lub zog ntau dua lossis sib npaug nrog 1100 mpa kom muaj zog dua los yog sib npaug ntawm -30℃ntau dua lossis sib npaug nrog 50j
Cov khoom tshwj xeeb: khoov rog rog (10⁷ Cycles) yog 60% ntawm lub zog tensile muaj zog, thiab cov qoob loo loj tom qab kev kub siab carburizing tswj astm qib 7-9.
Lub Tshuab Nqus Tsev Canburizing tuaj yeem txo qis kev deformation (kev sib txawv sib txawv tsawg dua lossis sib npaug rau 0.02 mm / m).
3. Cov ntawv thov raug
Q: Qhov kev siv ntawm 4720 cov yeeb nkab tseem ceeb dab tsi?
A:
Aerospace kis: Turbofan cav muaj zog siab, nyoob hoom qav taub, lub zog (yuav tsum ua raws li Ams 6265)
Cov Khoom Siv Hluav Taws Xob: Kev Kub Ceev Zog Rau Cov Cua Turbine Gearboxes saum toj kawg 10 Cov Zog
Cov tub rog tshwj xeeb: Tank Kis tau tus kab ke hyperbolic zog, electromagnetic phom kev sib hloov tsheb siv hluav taws xob nplhaib lub zog (yuav tsum xeem dhau mil-s-7100 kuaj)
Precision Machinery: High-Ceev Rail Vuag Zog Zog, Cov Khoom Siv Tshuab Cutterhead Tsav Lub Nplai (Penetration Daus 1.5-2.0mm)
4. Cov ntsiab lus tseem ceeb rau kev kho cua sov thiab kev ua
Q: Yuav ua li cas thiaj zoo kho cov cua sov thiab kev ua haujlwm ntawm 4720 cov yeeb nkab steel? A:
Kev txiav-ntug "qis-siab ntshav carburizing + ultra-siab-siab roj quenching" cov txheej txheem yuav tsum tau siv:
Carburizing ntawm 920 degree, 0.3 MPa acetylene ntshav rau 4-6 teev, nrog cov tshuaj muaj peev xwm tswj tau ntawm ± 0.02%
Quenching using 20 bar helium, with a cooling rate >150 Degree / s
Cryogenic Kho (-196 Qib x 8 teev) + mem tes tempering (180℃x 6 teev)
Txwv tsis pub txwv:
Vuam yuav tsum tau ernicrmo-4 xaim xaim, preheated rau 350 degree
Kev Xa Khoom Yuav Tsum Cbn-Coated Cuab Yeej (Txiav Ceev 80-100 M / min)
Kev txwv qeeb ntawm 500-700℃raug txwv los tiv thaiv cov nplej Ciam Albide nag lossis daus.
5. Piv nrog cov ntaub ntawv zoo sib xws
Q: Dab tsi yog qhov sib txawv ntawm 4720, 4320, thiab 9310 kav hlau? A:
vs . 4320}: 4720 muaj cov ntsiab lus molybdenum siab dua (0.30%
vs {. 9310}: 4720 muaj cov ntsiab lus npib tsib xee (0.70% -1.00%}}), ua rau muaj 35% txo nyob rau hauv carburization deformation.
Imperial txoj cai ntawm tsis-hloov chaw:
▶ Strictly prohibited from substituting CSS-42L for ultra-high-speed (>30,000 rpm) aviation gearmiation.
▶ Strictly prohibited from substituting Pyrowear 675 for high-temperature (>500 degree) hnav-resistant seem.
