Vale akhoza kutsegulanso Itabira pambuyo pa njira za coronavirus

Mgodi wachitsulo waku Brazil, Vale SA, walandila chilolezo chotsegulanso migodi m'bwalo la Itabira lotsekedwa chifukwa cha nkhawa za coronavirus, kampaniyo idatero polemba Lachitatu, ndikuwonjezera kuti palibe kusintha pakuwongolera kwake.

Vale adati adalandira chilolezo chotsegulanso migodiyi kuchokera kwa oyang'anira ntchito m'boma la Minas Gerais. Iwo adatsimikiza kuti zomwe Vale adachita kuti achepetse chiwopsezo cha kachilomboka ndikuteteza ogwira nawo ntchito zinali zokwanira kuyambiranso ntchito, kampaniyo idatero.

Komabe, Vale adati ntchito idzayamba pang'onopang'ono.

Nyumba ya Itabira idatulutsa pafupifupi matani 36 miliyoni achitsulo mu 2019, malinga ndi Vale, pakupanga matani pafupifupi 302 miliyoni.

Khothi lidalamula m'mbuyomu kuti nyumba ya Itabira itseke kumapeto kwa Meyi, koma chigamulochi chidasinthidwa nthawi yomweyo.

Kenako, koyambirira kwa Juni, woweruza adalamula kuti atsekedwe pambuyo poti ogwira ntchito 188 adayezetsa kuti ali ndi vuto la coronavirus.

Kusankhidwa kwa Zinthu Zopangira Mpira Mill

Zosiyanasiyana zophwanyidwa, zogwirira ntchito zosiyanasiyana zimafunikira ma liner osiyanasiyana kuti agwirizane. Komanso, chipinda chogawirako ndi chopera bwino chimafunikira zingwe zosiyanasiyana.

H&G Machinery imapereka zinthu zotsatirazi kuti muponyere liner yanu ya mphero:

Chitsulo cha Manganese

The manganese zili mkulu manganese zitsulo mpira mphero akalowa mbale nthawi zambiri 11-14%, ndi mpweya zili zambiri 0.90-1.50%, ambiri amene ali pamwamba 1.0%. Pakatundu wocheperako, kuuma kumatha kufika HB300-400. Pakatundu wambiri, kuuma kumatha kufika HB500-800. Kutengera momwe zimakhudzira, kuya kwa wosanjikiza wowuma kumatha kufika 10-20mm. Wosanjikiza wowuma wokhala ndi kuuma kwakukulu kumatha kukana kukhudzidwa ndikuchepetsa kuvala kwa abrasive. Chitsulo chapamwamba cha manganese chimakhala ndi ntchito yabwino kwambiri yotsutsana ndi kuvala pansi pakuvala kwamphamvu kwa abrasive, motero nthawi zambiri amagwiritsidwa ntchito m'magawo osamva amigodi, zida zomangira, mphamvu zotentha, ndi zida zina zamakina. Pansi pazikhalidwe zotsika kwambiri, chitsulo chachikulu cha manganese sichingakhale ndi mawonekedwe azinthuzo chifukwa chowumitsa ntchito sichikuwonekera.

Mapangidwe a Chemical

Dzina	Mapangidwe a Chemical (%)
Dzina	C	Si	Mn	Cr	Mo	Ku	P	S
Mn14 Mill Liner	0.9-1.5	0.3-1.0	11-14	0-2.5	0-0.5	≤0.05	≤0.06	≤0.06
Mn18 Mill Liner	1.0-1.5	0.3-1.0	16-19	0-2.5	0-0.5	≤0.05	≤0.06	≤0.06

Zimango katundu ndi kapangidwe metallographic

Dzina	Kuuma Pamwamba (HB)	Mtengo wa Ak (J/cm2)	Microstructure
Mn14 Mill Liner	≤240	≥100	A+C
Mn18 Mill Liner	≤260	≥150	A+C
C -Carbide \| Carbide A-yosungidwa austenite \| Austenite

Mafotokozedwe azinthu

Kukula	Hole Dia. (mm)		Kutalika kwa Liner (mm)
Kukula	≤40	≥40	≤250	≥250
Kulekerera	+ 20	+ 30	+	+ 30

Chrome Alloy Steel

Chromium aloyi kuponyedwa chitsulo ogaŵikana mkulu chromium aloyi kuponyedwa chitsulo (chromium zili 8-26% mpweya zili 2.0-3.6%), sing'anga chromium aloyi kuponyedwa chitsulo (chromium zili 4-6%, mpweya zili 2.0-3.2%), otsika chromium Mitundu itatu ya aloyi kuponyedwa chitsulo (chromium zili 1-3%, carbon zili 2.1-3.6%). Chochititsa chidwi ndi chakuti microhardness ya M7C3 eutectic carbide ndi HV1300-1800, yomwe imagawidwa mu mawonekedwe a maukonde osweka ndi olekanitsidwa pa martensite (yovuta kwambiri muzitsulo zachitsulo) masanjidwewo, kuchepetsa zotsatira za cleavage pa masanjidwewo. Chifukwa chake, cholumikizira chapamwamba cha chromium chimakhala ndi mphamvu zambiri, kulimba kwa mphero ya mpira, komanso kukana kuvala kwapamwamba, ndipo magwiridwe ake amayimira kuchuluka kwazinthu zomwe zitsulo sizimva kuvala.

Mapangidwe a Chemical

Dzina	Mapangidwe a Chemical (%)
Dzina	C	Si	Mn	Cr	Mo	Ku	P	S
High Chrome Alloy Liner	2.0-3.6	0-1.0	0-2.0	8-26	≤3.0	≤1.2	≤0.06	≤0.06
Middle Chrome Alloy Liner	2.0-3.3	0-1.2	0-2.0	4-8	≤3.0	≤1.2	≤0.06	≤0.06
Low Chrome Alloy Liner	2.1-3.6	0-1.5	0-2.0	1-3	0-1.0	≤1.2	≤0.06	≤0.06

Zimango katundu ndi kapangidwe metallographic

Dzina	Pamwamba (HRC) Ak (J/cm2)				Microstructure
High Chrome Alloy Liner		≥58		≥3.5		M+C+A
Middle Chrome Alloy Liner		≥48		≥10		M+C
Low Chrome Alloy Liner		≥45		≥15		M+C+P
M-Martensite	C-Carbide		A-Austenite		P-Pearlite

Mafotokozedwe azinthu

Kukula	Hole Dia. (mm) Kutalika kwa Liner (mm)
Kukula	≤40	≥40	≤250	≥250
Kulekerera	+ 20	+ 30	+	+ 30

Cr-Mo Aloyi Chitsulo

H&G Machinery imagwiritsa ntchito chitsulo cha Cr-Mo alloy poponya mphero. Zinthuzi kutengera muyeso waku Australia, (AS2074 Standard L2B, ndi AS2074 Standard L2C) zimapatsa mphamvu komanso kukana kuvala pamapulogalamu onse opangira ma semi-autogenous mphero.

Mapangidwe a Chemical

Kodi	Chemical Elements (%)
Kodi	C	Si	Mn	Cr	Mo	Ku	P	S
L2B	0.6-0.9	0.4-0.7	0.6-1.0	1.8-2.1	0.2-0.4	0.3-0.5	≤0.04	≤0.06
L2C	0.3-0.45	0.4-0.7	1.3-1.6	2.5-3.2	0.6-0.8	0.3-0.5	≤0.04	≤0.06

Physical Property & Microstructure

Kodi	Kuuma (HB)	Ak (J/cm2)	Microstructure
L2B	325-375	≥50	P
L2C	350-400	≥75	M
M-Martensite, C-Carbide, A-Austenite, P-Pearlite

Ni-hard Steel

Ni-Hard ndi chitsulo choyera choyera, chosakanikirana ndi faifi tambala ndi chromium yoyenera kutsika pang'ono, ma abrasion otsetsereka pazonse zonyowa komanso zowuma. Ni-Hard ndi chinthu chosamva kuvala kwambiri, chopangidwa m'mawonekedwe ndi mawonekedwe omwe ndi abwino kuti agwiritsidwe ntchito pamapangidwe abrasive ndi kuvala ndi kugwiritsa ntchito.

Mapangidwe a Chemical

Dzina	C	Si	Mn	Ndi	Cr	S	P	Mo	Kuuma
Ni-Hard AS2027 Gr Ni Cr 1-550	3.2-3.6	0.3-0.8	0.2-0.8	3.0-5.0	1.5-3.0	≤0.12	≤0.15	≤0.5	550-600HBN
Ni-Hard AS2027 Gr Ni Cr 2-550	2.8-3.2	0.3-0.8	0.2-0.8	3.0-5.0	1.5-3.0	≤0.12	≤0.15	≤0.5	500-550HBN
Ni-Hard AS2027 Gr Ni Cr 2-550	3.2-3.6	1.5-2.2	0.2-0.8	4.0-5.5	8.0-10.0	≤0.12	≤0.15	≤0.5	630-670HBN

Chitsulo Choyera

White iron liner ikulimbikitsidwa kuti igwiritsidwe ntchito mopanda mphamvu kwambiri monga:

1. Lamba wonyamulira cholumikizira chamakampani a Migodi.

2. Chigayo cha mpira wa simenti.

3. Chemical makampani mpira mphero.

Mapangidwe a Chemical

Dzina	Mapangidwe a Chemical (%)
Dzina	C	Si	Mn	Cr	Mo	Ku	P	S
White Iron Steel Liner	2.0-3.3	0-0.8	≤2.0	12-26	≤3.0	≤1.2	≤0.06	≤0.06

Physical Property & Microstructure

Dzina	Mtengo wa HRC	Ak(J/cm2)	Microstructure
White Iron Steel Liner	≥58	≥3.5	M+C+A
M-Martensite C-Carbide A-Austenite

Ngati muli ndi mafunso apadera, chonde lemberani injiniya wathu kuti akuthandizeni!

Nick Sun [email protected]

Nthawi yotumiza: Jun-19-2020