1. Cov khoom txhais thiab cov khoom tseem ceeb
Q: Dab tsi yog ovm 519 4815 cov yeeb nkab?
A:
4815 tus yeeb nkab steel yog ib qho tsawg-chromium-molybdenum alloy steel seamless yeeb (uns g48150) teev nyob rau hauv Astm ATTM A519 tus qauv. Nws cov tub ntxhais muaj pes tsawg leeg yog: 0.13% -0.18% carbon, 3.25% -3.75% npib tsib, 1.30% chromium, thiab 0.20% molybdenum. Cov ntaub ntawv no, los ntawm cov nickel siab-molybdenum composite txhawb kev tsim qauv (kev sib npaug ntawm -196℃(roj quenching tseem ceeb inch 150mm). Tom qab kev kho cua sov tshwj xeeb, cov ntsiab lus ntawm cov ntsiab lus Austenite tuaj yeem ncav cuag 15% -20%. Nws cov hydrogen embrittlement (nace tm0284 tawg tus nqi tsawg dua los yog sib npaug rau ultra-tsawg cov ntaub ntawv zoo li ultra-tsawg kub thiab cov siab kub ib puag ncig.
2. Cov Khoom Siv Cov Neeg Kho Tshuab thiab Cov Lus Qhia
Q: Qhov ntsuas tau ua tiav ntawm 4815 tus yeeb nkab steel?
A:
Hauv lub xeev quenched thiab tempered (850℃roj quenching+ 600 deg℃tempering):
Lub zog: Tensile Lub Zog 950-1150 MPa, zog, zog zog 800-950 MPA
Kev nyuaj: elongation ntau dua los yog sib npaug rau 16%, txo thaj chaw ntau dua lossis sib npaug nrog 55%, -196℃muaj kev cuam tshuam loj dua los yog sib npaug rau 40j
Cov Khoom Tshwj Xeeb: Cov Pob Tawb Sib Tw (Kic @ -196 Degree) Ntau dua lossis sib npaug ntawm 75 PPAZE CLACTURE LUB SIJ HAWM LOS NTAWM 200H
Tom qab kho cryogenic (-196℃X 24h), cov ntsiab lus Austained tuaj yeem tswj tau tsawg dua lossis sib npaug rau 5%.
3. Cov ntawv thov raug
Q: Cov ntaub ntawv thov ntawm 4815 tus yeeb nkab steel?
A:
Ultra-Cryogenic Khoom Siv: LNG Tank Linter Support Cov Qauv, Ua Kua Hydrogen Pipelines (-253 Kev Kawm Ntawv Ib Ze)
Lub Zuag Ua Zog Tshaj: Fusion Reactor Superconducting Magnet Txhawb Rings, Supercritical Dej-Txias Reactor Siab Hlab Hlais
Aerospace: kua oxygen / kua hydrogen rocket tshuab tshuab turbine nqus casings
Cov cuab yeej ua tub rog: Khaub ncaws txias-resistant
4. Cov ntsiab lus tseem ceeb rau kev kho cua sov thiab kev ua
Q: Yuav ua li cas thiaj ua tau kev kho kom sov thiab ua ntawm 4815 tus yeeb nkab steel? A:
Lub "ultrafine grain pretreatment + Rov qab Austenite tswj" txheej txheem yuav tsum tau siv:
Cyclic autustenitization (950℃× 1h → Degree × 2H, rov ua dua peb zaug) kom ua tiav Astm Qib 12-14 ultrefine nplej.
Sov rolling nyob rau hauv ob-theem cheeb tsam (750 degree) mus rau 30% -40% deformed ua raws nraim li quenching.
Ntau theem kev laus (475℃× 8h → Degree × 4h) kom ruaj khov ni₃ti nag lossis daus.
Txwv tsis pub txwv:
Vuam yuav tsum tau ernicrmo-12 hlau thiab preheating rau 200-250 degree.
Tig tau yog txwv rau pob zeb diamond-coated tsawg dua tsawg dua los yog sib npaug rau 25 m / min).
Kub Forging Qhov Kub Ntxhua Qhov Kub yuav tsum muaj nruj me ntsis tswj nyob rau hauv lub qhov rais nqaim ntawm 1100-900 degree.
5. Piv nrog cov ntaub ntawv zoo sib xws
Q: Qhov sib txawv ntawm 4815 thiab 9% ni steel thiab invar 36? A:
vs . 9% ni steel: 4815 muaj cov ntsiab lus txog tsib caug qis (3.75%
Vs. Invar 36: 4815 yog 3-4 lub sij hawm muaj zog, tab sis muaj 50% ntau dua coefficient ntawm thermal expansion (CTE) tshaj qhov tsis sib haum 36.
Tsis yog hloov chaw ntawm qhov chaw tsis hloov chaw:
Nws yog me ntsis txwv tsis pub hloov Haynes 230 rau kev siv hauv oxidizing ib puag ncig saum 1600 degree.
Nws yog txwv hloov Ti-6V-4V rau Aerospace cov qauv uas qhov hnyav txo yog qhov tseem ceeb.
