1. Dab tsi yog cov khoom siv ntawm cov khoom thiab cov tseem ceeb ntawm Astm 519 8637 steel yeeb nkab?
Teb:
8637} yog qhov siab - chromium alloy steel teev nyob rau hauv Astm ATTM A519 tus qauv. Nws muaj pes tsawg leeg (0.35-0.40% cov pa roj carbon, 1.65-2.00% npib tsib, 0.70-0.30% molybdenum) muaj cov yam ntxwv zoo li nram qab no:
Ultra - lub zog siab {{}} Lub zog tsis muaj zog: Tom qab Tensile muaj zog: Tom qab kev tswj hwm lub zog ≥40 J ntawm -40 ° C.
Sib sib zog nqus tawv: vim nws cov nickel siab - cov ntsiab lus chromium quench mus txog 2008630 series.
Cov Khoom Tshwj Xeeb: Nws cov hydrogen embrittlement yog qis dua li ntawm 4340 hlau (nace TM0177 xeem dhau tus lej ≥9%).
2. Tus txheej txheem cua sov li cas rau 8637 Cov yeeb nkab steel ua tiav qhov kev ua tau zoo no? A: Cov txheej txheem customized yog qhov xav tau raws li cov xwm txheej tshwj xeeb:
Ultra - Cov Khoom Loj (xws li nkoj Crankshafts):
Siv kauj ruam quenching (dej quenching rau 2 feeb ua raws li cov roj txias) kom tsis txhob muaj kev pheej hmoo ntawm martensite;
High - prech precision hnav -} Cov ntu tiv taus:
Recommended cryogenic treatment (-196°C for 24 hours followed by tempering at 150°C) achieves a retained austenite conversion rate of >90% thiab txhim kho qhov seem ruaj khov los ntawm 50%;
Weld Kho Chaw:
Laser Shock Peening (LSP, 5 GW / CM²) yuav tsum tau rov qab ua kom lub neej qaug zog ntawm cov cua sov- cuam tshuam thaj tsam rau ntawm niam txiv cov khoom.
3. Nyob rau hauv dab tsi huab kev ua haujlwm yog 8637 cov yeeb nkab steel Irreplaceable?
A:
Tob - Cov Khoom Siv Hiav Txwv:
Tag nrho - Hiav txwv ua kom muaj kev tiv thaiv zoo (100 mpa hydrostatic siab siab + hydrogen kev tiv thaiv);
Aerospace:
Lub nyoob hoom qav taub lub tshuab raj (FAA 25.571 Luv-Foob Qhia Txog Kev Tshawb Fawb), foob pob ua ntxaij tsis kam);
Zog:
Plaub {-}}}} Nplooj Hwj chim cog lub zog loj {}}}}}}}}}}}}}}}}}}}} / 4340?
vs . 8645:
8645} muaj cov txiaj ntsig carbon ntau dua (0.43%
vs . 4340:
Ob qho tib si tau sib piv lub zog, tab sis 8637 tswj cov ntsiab lus muaj nyob rau ntawm nws cov ntsiab lus zoo tshaj li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li 15% tsawg dua li $} tsawg tsawg.
5. Dab tsi yog cov ntsiab lus tseem ceeb rau tag nrho- txheej txheem zoo tswj ntawm {2} Cov yeeb nkab steel?
Metallurgical Control:
Ib lub tshuab nqus tsev sol desuction melting (vim) + electroslag remelting (ESR) cov txheej txheem yuav tsum tau siv los ua kom ntseeg tau tias [≤ 10 ppm.
Daim ntawv qhia txog kev nyiam huv (ASTM E45 chav kawm ib qib ≤ qib 1) yuav tsum muaj. Ua thiab tshuaj xyuas:
Tom qab ntxhib machining, sib nqus domain alignment kho (200 ° Cignment
Kev sib tsoo zoo siv rau kev lag luam elecolytic honing, ua tiav qhov nplaim taws ra ≤ 0.2μm.
Kev Pabcuam:
Kev Ntsuas Ullominear (txhawm rau paub cov kev hloov pauv hauv kev rho tawm ntom ntom ntom) yog ua txhua 5,000 teev.
Hydrogen Sensors (khoom siv hluav taws xob siv hluav taws xob) yog yuav tsum tau rau hydrogen ib puag ncig cov khoom siv.
