1. Cov Khoom Siv Hluav Taws Xob thiab cov khoom tseem ceeb
Q1: Dab tsi yog alloy tsim lub tswv yim thiab cov txuj ci kev ua haujlwm ntawm 81b45 steel yeeb nkab?
A1:
ASTM A 519 81 b45 yog boron-} High carbon chromium {}} molybdenum steel yeeb nkab. Nws muaj pes tsawg leeg (0.43-0.48% c, 0.75% cr, 0.15-0.25% mo, 0.003% b) ua tiav cov kev sib tw los ntawm kev sib tw los ntawm cov kab sib npaug:
Lub zog siab -} Kev sib npaug sib npaug: tswj hwm lub zog loj dua los yog sib npaug ntawm cov pab pawg shagang hauv 2025);
Optimized Hardenability: Tseem Ceeb Inch (Roj Quenching) Mus Txog 95 hli, 25% Kho Kom Zoo Dua 4140 Hlau;
Kev lag luam zoo: Boron hloov ib feem ntawm Molybdenum, ua rau muaj 15% them tus nqi piv rau 4340 steel nrog sib piv. Cov Kev Siv Raug:
Hnyav {- phoo ntawv thawb hauv kev siv tshuab ua khoom siv;
Cua turbine Pitch Bearings (yuav tsum tau 100% sib nqus particle tshuaj ntsuam);
Roj Lij Yeeb Nkab Advters.
Ii. Kev ua tau zoo nrog cov khoom siv sib tw
Q2: Yuav ua li cas ua qhov sib txawv ntawm 81b45, 4145, thiab 50B46 Phau Ntawv Qhia Cov Khoom Siv?
A2:
Composition Spectrum:
81B45: Nws cov ntsiab lus carbon (0.45%) yog nruab nrab ntawm 4145h (0.45-0.50%) thiab 50b46 (0.44-0.49%), nrog cov ntsiab lus coron tshwj xeeb)
50b46: Nws cov ntsiab lus Chromium yog qhov siab dua (0.80-1.10%), ua rau muaj kev nyuaj me ntsis tab sis 5% nce nqi. Cov ciaj ciam:
Weldability: 81B45 (CE ≈ ≈ ≈ 0.50)> 4145H (CE ≈ ≈ ≈ ≈ ≈)> 50 xyoo (CE ≈ 0.53);
Qaug zog lub neej: 50b46 (ntau dua los yog sib luag rau 7 × 10⁶.) ≈ 81B45> 4145H.
III. Kev tswj cov tshuab ua ke ntawm kev kho tshav kub
Q3: Cov kev tswj tseem ceeb yog dab tsi rau kev kho cua sov ntawm 81b45 steel yeeb nkab?
A3:
Tus txheej txheem Benchmark:
Austenitizing: 850-875 Degree × 1h / 25mm (yuav tsum muaj nitrogen huab cua los tiv thaiv Decarburization);
Quenching: polymer aqueous daws (txias tus nqi 90-110℃/ s), deformation tswj kom tsawg dua lossis sib npaug rau 0.03mm / m;
Tempering: Ob npaug {{{qib tempering (200 degree} {}}}} kev ntxhov siab. Kev tiv thaiv cov kev ua si:
Titanium / Aluminium composite deoxidation (ti / al=3}}}}}}}}}}}}}}}}}}: 1) Locks hauv muaj nyob ntawm Boron;
Electromagnetic nplawm thaum lub sij hawm nruam casting (equiaxed grain piv ntau dua los yog sib npaug ntawm 88%) tiv thaiv MacRšubration.
IV. Kev Soj Ntsuam Zoo thiab Kev Tiv Thaiv Tsis Zoo
Q4: Cov khoom tshuaj xyuas tshwj xeeb dab tsi rau cov khoom siv tshwj xeeb rau 81b45 hlau kav hauv cov cua hluav taws xob?
A4:
Yuav tsum tau tshawb xyuas cov khoom kuaj:
Hardenility Bandwidth (Jominin ntsuas xaus nyuaj txawv tsawg dua los yog sib luag rau 5 teev);
Ultrasonic qhov fab kev ntsuas (conforms rau ASTM A388, kuaj pom yam tsis xws luag 1.2 mm hauv lub taub);
Hydrogen -} inducle nrus nruam kuaj (nace TM0284-2025 TXAUS A).
Kev Tiv Thaiv Kev:
Sib tsoo hlawv: Siv CBN sib tsoo lub log (pub tsawg dua lossis sib npaug rau 0.015 mm / pass);
Hydrogen embrittlement kev pheej hmoo: Dehydogenation kev kho mob ntawm 190℃rau 8 teev tom qab electroplating.
V. Tshuab thev naus laus zis thiab kev ua lag luam Dynamics
Q5: Dab tsi yog cov lus qhia thev naus laus zis rau 81b45 steel kav hauv 2025? A5:
Cov txheej txheem kev xav tau:
Laser - arc Hybrid Vuam (Hardness Comped (Hardness Compinter)- kev cuam tshuam thaj chaw tsawg dua lossis sib npaug ntawm 2 teev);
Ntshaw quenching nruab nrab tswj (kev hloov kho kom haum ntawm cov nqi txias ± 3%).
Ntsuab Raug:
Electric arc rauv taws luv luv - txheej txheem smelting (co emissions txo mus rau 0.65 tons ib tev ntawm cov hlau);
Supercritical kev tu tu hloov cov pickling (xoom dej kom dim).
Hloov Hloov Qauv:
Dnvgl -} st-0378-2025 Ntxiv cov specifications rau kev pabcuam polar ntawm 81b45 steel.
