NGHICN CCfU - TRAO Ddi NGHIEN CCrU NAU LUYEN MAC THEP C60 Tir NGUYEN LIEU SAT X 6 P TRONG LO CAM UNG STUDY ON MELTINH C60 STEEL FROM SPONGE IRON IN INDUCTION FURNACE ThS.. Chuin bi ngu
Trang 1NGHICN CCfU - TRAO Ddi
NGHIEN CCrU NAU LUYEN MAC THEP C60
Tir NGUYEN LIEU SAT X 6 P TRONG LO CAM UNG
STUDY ON MELTINH C60 STEEL FROM SPONGE IRON
IN INDUCTION FURNACE
ThS Trin Cong Thiic", PGS,TS 8inh Vin Chiln'
'Khoa Cdng nghp, Trudng Dai hpc Thii Binh (NCS Hpc vien Ky thuit Quin sy)
Vi?n Khoa hpc Cdng nghe Co khi - Tu dpng hda vi Mdi trudng
T6M TAT
Tttep €60 chdt Itegng tdi dtegc sie dung nhieu trong qudn sude che tgo vukhivd mpt sp ddu
dgn Bdi bdp trinh bay kit qud nghien cieu luygn mdc thep C60 tir nguyen ligu sdt xdp Mirex, dgt yeu
cdu vi thdnh phan 0.57+0,65% C: 0,50*0,80% Mn; 0,17-0,37% Si:<0,04% P; <0,04% S; <0,25%
Cr, Ni [4] Kit qud nghien aiu khdng dinh, sdt xdp Id nguyen ligu sgch cd hdm lupng P% vd S%
thap, dtegc luygn trong Id cdm ieng, do nu&e thep sdi too dieu kign khie tgp chdt tot, sdt xdp dupc
hodn nguyen nhigt dp ttidp nhieu nguyen td vi Ittpng dtegc lieu giie trong thep
Tir khda: Sdt xdp, thep C60, td chur li vi
ABSTRACT
Good quality €60 steel is widely used in military to make weapons and some warheads
This paper presents the research results practicing €60 steel from sponge iron Mirex, meets the
requirements of components 0.57+0,65% €; 0,50*0,80% Mn; 0,17-0,37% Si; <0,04% P; <0,04%
S; <0,25%Cr, Ni [4] The study results confirmed, sponge iron is clean materials content S%, P%
lowerOn meltinh in induction fiimaces,because of water boiling steel in facilitating fluxes well,
sponge iron reverted low temperatures many trace elements are kept in steel
Keywords; Sponge iron; steels €60, microstructure
I LD^TVANDfe Nhung dS luyin dupc mic t h ^ cd him
lupng tjp chit thip P, S thip, khi thip li khd ' Thdp C60 cd thinh phin 0.58%C, hpp khan, phii su dung cdng nghf phirc tap vi tdn
> kim 0.627%M, 0.176%Si dupc niu luypn dS kem Nhd cd sit xdp, mpt nguyen lipu s?ch ham
' cd him lupng t?p chit phi kim vi khi thip lupng t^ip chit thip, P,S thip, chiia mpt Iupng
0.024%P, 0.022%Scd thi su dung di chd t^o oxy nhit djnh, dupc luypn trong Id cim ling cd
cic chi tiet diu dtm tinh nang sdi, khuiy dio nudc thdp t?o thuin lpi
cho vipc khu t^p chit ^
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Trang 2NGHieNCO'U-TRAOOOl
Bii bio trinh biy kdt qua nghien ciiu thyc nghiem luy?n mac thdp C60 bing nguydn lipu sit xdp Mirex luyen trong 16 cim ihig Cic sd lieu chimg minh sii dung sit xdp voi him lupng P, S < 0.04 [2], ddu cho thep cd thanh phin tap chit P,S < 0,025
2, NOI DUNG NGHIEN ClTu
2.1 Scr do cic bvd^c nghien ciru tfairc nghidm
Chuan b\ nguyen li^u:
sat xop-Tbep pbe
Luy^o trong Id c ^ img
Khao sat td chuc Due phdi
Hinh 1 Sadd cdc bu&c cdng nghp
1.1 Chuin bi nguyen lifu
Chpn loai thep phd CT3 khdng dinh t^p ch^t dupc cit nhd vira kich thudc 16 niu
Bang 1: Nguyen Upu sat xdp (sponge iron) dugc say khd vd kiem tra thdnh phdn fl]
Ting sit
86^92
Sit kim loai
8(K82
C
<0,3
P
<0.03
S
<0.03
C6n lai
FeO, NTHK
C» h«t(mm)
12+34
Bdng 2: Thdnh phdn thep phe vdfero
Nguy§n li$u
Th6p phe CT3
FeMnSO (cic bon thap)
FeSi75
Thinh phin hoi hpc (%)
C 0,12 0.015 0.015
Si 1 Mn
0,18 0,39 1.45 80
75 1
P
0,04 0.3 0.03
S
0,045 0.03 0.02
Ld cdm ung 250Kg Mdy phdn tich thdnhphdn Q4-Tasan 170 Hlnh 2 Mpt sd hinh dnh ve qud trinh thtrc hipn thi nghipm
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Trang 3NGHISN CU'U - TRAO DOI
23 Luyfn diic phoi thep
Thep dupc luy^n trong Id cira ling trung tin 250kg, tai Cdng ty MIREX tu nguyen lipu sit
xdp Cao Bing (bing 1) Nguyen lieu ban diu li 40% sit xdp, 60% thep phi CT3 vi rapt sd nguyen
lipu hpp kim hda nhu: FeMnSO cacbon thip, FeSi75, Ni, dupc khii khi bing FeMnSO, FeSi75 vi
nhdm
Bdng 3: Bdng tinh todn phdi lieu mde ttiep nghien ciru
TT
1
2
3
4
5
NguySn li$u
Sit xop
Thep ph8 CT3
FeMnSO
FcSi75
FeCr70
Khoi lir^g (kg)
92
174 3,5 2,6 0.5
TT
6
7
8
9
10
Nguyte ll^u
Ni Nhom day Than vyn CaO CaF,
Khii lirpng (kg) 0.35 1.5 1.9
5
3
Chuin bi nguydn v^t li?u: Nguyen li?u
dupc lim sach chit ban, dupc siy khd va dd
ridng tung lo^i Kidm tra nOi hinh Id: Khdng
dupc cd cic vj tri ldm qui siu,ndi Id phii dupc
lim S9ch vvin vit li^u chju liia, s^ch xi cua me
nau trudc va cac chat bin khic.Kiem tra hogt
dpng cua h^ thdng nudc lim mit vdng cim ung,
qua h$ th6ng ty di^n, tu di^n
Nau chdy lipu: Lot ndi Id 1kg (CaO/
CaFji 1/5) Thdp ph^ CT3 dupc xdp khit vio Id,
cic thanh lidu cd kich thudc ldn dupc xep sat
tudng 16 noi tip trung nhiet cao nhit Nang din
cdng su^t khoing 80% cdng suit djnh mure cho
d^n khi thep phe chay het, tien hanh ha cdng
suit Id xudng khoing 50% vi duy tri de ngp lieu
sit x6p
Sit xdp cin dupc say khd, ngp sit xdp
dupc chia lim nhilu dpt, m5i dpt 5kg, khdng
dd sit xdp ndi tren bd mit xi, duy tri chieu diy
Idp xi khoing 10mm, ngp het sd lupng sit xdp
khoing 5 phut thi nang cdng suit Id Ien 80%
Quan sit li$u ngp chiy het tien hinh vdt xi, tgo
xi lan 2 vdi lupng khoing 1kg CaO+CaF, Sau
khoing 2-3 phut de xi chay Idng, lay mau den
phin tich thinh phin
Khir tgp chdt:
Khu P: Tgo xi mdi khir P, dO Bazo B=3, cho mpt lupng nhit djnh oxit sit vdi trpng lupng chiem khoang 14-18% trpng lupng xi, duy tri nhi?t dp 16 d khoing 1.300-1 BSC'C Khdi lupng
xi ngp ty I? vdi lupng P can khii, xi/P = 35-^50 lin, nhung khdng qui 1,5% trpng lupng me nau
Khir C; Dung quing sit de khii, lupng
n ^ FeO/C = 6(K80 lin, nhung khdng qua 1,5%
trpng lupng me niu
Khu S: Khu S tien hinh sau khi khu khi, tgo xi mdi khu S, dp Baza B = 6, ning cdng suit Id ldn de nhiet dp nudc thep khoing khoang 1.650**C; Khdi lupng xi ngp ty I? vdi lupng S cin khu, xi/P =10-20 lin, nhung khdng qua 1,5%
trpng lupng me nau
Khu khi; Dung FeMnSO + FeSi75 + Al vdi ty le: 1,5 kg+1,5 kg -K),8 kg Ngp theo thu tu FeMn —• FeSi —• Al Dd khir khi tri?t dd, dimg day nhdm kim logi mdt phan cho true tidp vio
Id, mpt phin khii tryc tidp trong giu rdt Tidn hanh liy miu den phin tich thinh phin xic dinh lupng didu chinh phii hpp •:
ISSN 0866 - 7056
T ^ CHf CO KHf VI$T NAM Sd 8 nim 2016
Trang 4NGHIEN c u u - T R A O o d l
Bang 4 Thanh phan hda hpc mdc thep nghien cuu tru&c khi hgp kim hoa
Thinh phin hia hpc (% khii lupng) Mac thep
Mic thdp NC
C
0,049
Mn 0,039
Sl
0,008
Ni 0,029
Cr 0,018
P 0,025
S 0,021
Lupng fero them vao dupc tinh theo cdng thiic:
iN-N')xM
>^r^=- (kg)
Trong do;
N: Him lupng nguyen td hpp kim mic thep nau (%);
N': Him Iupng nguyen td hpp kim trong thip trudc khi hpp kira hda (%);
a: Him lupng nguyen ti hpp kim trong fero (%);
ii: Hp si thu hdi cua hpp kim trong fero (%); M: Khdi Iupng cua toin me niu (kg)
Hpp kim hda thep: Sau khi khii t?p chit, khii khi tiin hinh hpp kim hda theo thii tir
FeMn-.FeSi-.FeCr-.Ni-C cy thi 2kg: 1,1kg: 0,5kg: 0,35kg: 1,9kg (nhipt dO ndng chiy FeMnSO: 1230°C-1260°C; FeSi75; 1210°C -13I5°C) Khi hpp kim hda chii y h* thip nhipt dp nudc thep Sau khi cac hpp kim tan het tien hinh liy mau phin tich thinh phin
Bdng 5 Ttidnh phan hda hgc mdc Ihep nghien euu sau khi hgp kim hda
Thinh phin hia hpc (% khii lugmg) Mic thdp
Mic thdp NC
C Mn
0,605 1 0,518
Si 0,180
Ni 0,188
Cr 0,139
P 0,025
S 0,024
Chuan bj ra th^: Nang nhipt dp Id Ien 1.650°C ii chuin bj ra thip, cho 50g AI day vio nii
Id rdi de thdp ling khoing 5+€ phiit Thio xi vi ra thep Tidn hinh rdt kim loji long vio giu rdt cho
0,1kg Al vio moi giu rdt de khu khi, chd khoing 3+5 phut cho khi thoit hit, nudc thep ling thi rdt vio khudn ming Chii y khudn rot phii dupc nung dd 60(H700»C
3 KET QUA VA DifiN GIAI PHAN TICH
3.1 Thinh phin hda hpc
Bdng 6 Thdnh phdn hda hge mde thep nghien euu v&i thep €60 Iheo FOCT 1050-88 [4]
Thinh phin hia hoc t% khil lirpnf,)
MacdidpNC
C60
rOCT 1050-88
C 0,605 0,57+0,65
Mn
0318 0,5+0,8
Si 0,180 0,17+0,37
M 0,188
Max 0,25
P 0,025
0,04
S 0,024
0,04
Or
0,139
MaxOJS
ISSN 0866 - 7056
TAP CHf CO KHf V I £ T NAM, Sd 8 nim 2016
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