hot rolled steel billet
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hot rolled steel
hot rolled steel billet
hot rolled steel billets
1. Product : Prime Quality hot rolled steel Billets.
2. Any Quantity.
3. Quality/Ch. Comp: grade 60 ASTM-A 615. Lower grades also available.
4. Packing : In bundles weight up to 5 mts each bundle.
5. Size: 150mm x 150mm.
6. Length: 6000mm/9000mm/11700mm.
Raw material : Iron ore lumps, sinters and pellets1, coke (made from cooking coal) and fluxes such as limestone, dolomite are the major raw materials.
The main steps in manufacturing process are as follows:
Melting: Raw materials are charged in a blast furnace where hot air is pumped to melt iron and fluxes at 16000C. The molten metal when cooled and solidified is called pig iron. Alternatively, it can be further refined to make steel. Slag (fluxes with foreign matter from ore) is separated, and blended with clinker to make cement.
Refining: Molten metal from the blast furnace is taken to steel melting shop where further reduction of impurities is done in oxygen furnace (LD converter) or open health furnace which is old technology. The crude steel in liquid form is taken in a ladle for further refining/ addition of Ferro alloys etc.
Casting: The liquid steel is cast into semi finished products such as billets, blooms, slabs etc. This process called continuous casting is different from old technology (still in use in older plants) where liquid steel is first solidified in large blocks called ingots and then rolled into semis, involving higher energy and waste in re-heating.
Rolling: The semis such as billets, blooms, slabs are heated at 12000C to make metal malleable and then rolled into finished products. There are different rolling mills for different products. Rolling mill for long products such as bars, angles, structural etc. can be part of steel making plant or an independent small-scale industry. Flat product rolling mills are capital intensive, as they have to meet strict quality parameters. Rolling rolls slabs in flat product HR plate/ strip/ coil by process of heating the slab followed. HR sheets thickness can be further reduced by cold rolling i. e. rolling in CR mill at room temperature. CR can be zinc coated in a galvanizing plant to make galvanized plates or corrugated sheets. (GP/ GC) . Wire rods can be drawn to make wires.