Steel making process involves process of producing steel from iron ore. The basic impurities like nitrogen, silicon, phosphorus , sulphur and excess carbon is removed from the basic iron. The other elements like manganese, nickel, chromium and vanadium are added to derive the different grades of steel.
The basic infrastructure of steel manufacturing comprises of coke ovens and coal chemical plant, sinter plant, blast furnace, steel melt shop, rolling mills. This is done either by Basic oxygen furnace or electric arc furnace. In the first method, the hot metal from the blast furnace is fed to basic oxygen furnace after pre-treatment and removal of impurities. Molten steel is derived in the liquid form and the impurities are removed as gaseous and as slag. In EAF process, steel scrap is melted with the aid of electric arc produced by graphite electrodes. This is used either as ingots or fed to the continuous casting process.
Corex gas and syn gas are also used in the modern day process of steel making. These are alternate to blast furnace method and use oxygen i
The applications involved are blast furnace gas or coke over gas, corex gas, oxygen, steam, nitrogen, hydrogen. Acids are used in the pickling plant for surface cleaning of sheets to remove the rust layer.
Cooling water, steam, hot water are used through out the steel plant at various locations.
Predominantly large size butterfly valves are used more in the steel plants for the gas application or large size gate valves and dual plate check valves. Wherever high temp applications are involved people use metal seated triple offset valves. Gate, globe, check and ball valves are used in smaller sizes for various utility applications.