Yuav ua li cas los txhim kho lub hardness ntawm grey hlau castings？
Yuav ua li cas txhim kho lub hardness ntawm grey hlau castings? Qhov no yog qhov teeb meem nyuaj ntsib los ntawm ntau qhov grey cam khwb cia hlau qhauj. Hauv qab no inoculant chaw tsim tshuaj paus Anyang Jinsheng Metallurgical mas los ntawm tus nqi piv, tshuaj lom neeg muaj pes tsawg leeg, ua kua hlau overheating thiab cov tshuaj tiv thaiv inoculation thiab lwm yam sib faib los qhia rau koj hauv kev nthuav dav yuav ua li cas txhim kho qhov nyuaj ntawm grey hlau castings.
1. Burden qhov sib piv
Siv cov txheej txheem ntawm cov npua hlau + seem hlau + rov qab them nqi + recarburizer, cov nitrogen hauv recarburizer yog siv los hloov cov duab thiab ntev ntawm graphite txhawm rau txhim kho lub zog ntawm grey hlau castings.
2. Tswj tshuaj lom neeg
(1) Ntau lub tuam txhab smelting ntseeg tias cov leej faj yog qhov tsim kev puas tsuaj, thiab qis dua cov ntsiab lus ntawm cov leej faj nyob hauv cov kua hlau, qhov zoo dua. Qhov tseeb, qhov no tsis yog qhov tseeb, thiab" silicon carbonization" thiab" manganese leej faj leej" yuav tsum tau txiav txim siab nyob rau hauv grey hlau castings. Mn=1.71 S + (0.2 ~ 0.5).
Tshuaj lom neeg muaj pes tsawg leeg ntawm HT250: CpSimntis 3 ~ 3.3≤0.121.65 ~ 2.050.7 ~ 1.1≤0.05≤0.12
(2) tsis tshua muaj alloying, ntxiv ib lossis ob lub ntsiab lus hlau, thaum ntxiv, yuav tsum xav txog cov ntsiab lus ntawm carbon keeb, tsis txhob blindly nrhiav kev nyuaj;
3, molten hlau overheating
Rau grey hlau castings, nce qhov kub ntawm molten hlau nyob rau hauv qee qhov kev tuaj yeem ua rau cov graphite refined, hauv matrix compact, thiab lub zog tensile thiab Brinell hardness ntawm cam khwb cia hlau nce. Kev ntsuas kub ntawm lub hlau molten yuav tsum tswj tsis pub dhau 1500-1530 ℃ thiab lub sijhawm ntsuas cua sov yuav tsum tswj tsis pub dhau 10min.
4, inoculant thiab inoculation txoj kev
Kev kho inoculation ntawm grey cam khwb cia hlau feem ntau nyob rau hauv cov hlau molten tom qab maj mam ntxiv inoculation tus neeg sawv cev (75 ferrosilicon feem ntau siv nyob rau hauv Suav teb), inoculation kho grey cam khwb cia hlau, hardness yuav zoo li niaj hnub zoo sib xws, txhim kho kev ua haujlwm ntawm kev siv tshuab, tab sis kuj nce lub zog ntawm grey cam khwb cia hlau.
Tus txheej txheem hardness ntawm grey hlau castings yog nruab nrab ntawm HB170-240.
