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Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe 3 C. By weight, it is 6.67% carbon and 93.3% iron. By weight, it is 6.67% carbon and 93.3% iron.
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co) 3 C.This forms a hard, shiny, silver mineral which was named by E. Weinschenk in 1889 after the German mineralogist Emil Cohen, who first described and analysed material from the Magura meteorite found near Slanica, Žilina Region, Slovakia. [3]
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Boron carbide, B 4 C, on the other hand, has an unusual structure which includes icosahedral boron units linked by carbon atoms. In this respect boron carbide is similar to the boron rich borides. Both silicon carbide (also known as carborundum) and boron carbide are very hard materials and refractory. Both materials are important industrially.
iron: ferrite, ferritic steel; iron: austenite, austenitic steel; iron carbide: cementite, Fe3C. It shows a eutectic and a eutectoid; these phases crystallise as a stacking of fine strips of pure phases (iron and cementite) in case of the eutectoid, or a pure iron containing small balls of cementite for the eutectic.
In late 2015, the plant outputted the first hot rolled coil manufactured in Vietnam. [11] "Phase 1" Blast furnace iron production was scheduled to begin in 2016, with two blast furnaces at the plant having a total production capacity of 7.5 MT pa; approximately 6 MT were for flat steel production, and 1.5 MT for rebar and other rolled steels. [12]
An HD version of VTV3 was launched on 31 March 2013. This channel is the first channel in VTV to broadcast in High Definition. Following that, HD versions of VTV6 and VTV1 was launched on 7 September 2013 and 31 March 2014, respectively. The other VTV channels' HD versions was launched in 2015.
Vietnam in HD (known as Vietnam Lost Films outside the US) is a 6-part American documentary television miniseries that originally aired from November 8 to November 11, 2011 on the History Channel. From the same producers as WWII in HD , the program focuses on the firsthand experiences of thirteen Americans during the Vietnam War .