Production method for producing 15 Cr colorful alloy steel plate through calcium-free chromium slag

Abstract

The invention discloses a production method for producing 15Cr color alloy steel plate with calcium-free chromium slag. The production method for 15Cr color alloy steel plate comprises the following steps: A. Utilizing solid waste produced by a chemical chromium salt production line, and using carbon as a reducing agent in an electric furnace Smelting to obtain chromium-containing cast iron; B. Refining with dephosphorized molten steel to reduce carbon and retain chromium in a converter, and pour into billets; C. Produce 15Cr alloy steel plates through hot rolling and cold rolling processes; D. The surface of the 15Cr alloy steel plate is ground, polished and textured; E. Color elements and active elements are added to the hot-dip 15Cr solution; F. The steel plate is placed in the solution for hot dipping. The invention uses the calcium-free chrome slag produced on the calcium-free roasting production line as the main raw material to produce the 15Cr color alloy steel plate. On the one hand, the secondary utilization of scarce resources is realized; economic purpose.

Description

technical field [0001] The invention relates to the technical field of 15Cr colored alloy steel plates, in particular to a production method for producing 15Cr colored alloy steel plates with calcium-free chromium slag. Background technique [0002] The chemical symbol of chromium is Cr, which is a silvery-white lustrous metal. Pure chromium has ductility, and chromium containing impurities is hard and brittle, with a density of 7.20g / cm3. It is soluble in strong alkali solution. Chromium has high corrosion resistance. In the air, even in the red hot state, the oxidation is very slow. Plating on the metal can play a protective role. Chromium can slowly dissolve in dilute hydrochloric acid and dilute sulfuric acid to form a blue solution, which is compatible with air Contact will quickly turn green, because it is oxidized to green Cr2O3 by oxygen in the air. 15Cr is a commonly used low-carbon alloy carburizing steel, which can significantly increase the carbon content on the...

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Problems solved by technology

15Cr is a commonly used low-carbon alloy carburizing steel, which can significantly increase the carbon content on the surface and increase the carburizing depth during carburizing. It is mainly used to manufacture high-speed and small-section (≤30mm), but Carburized parts that require high strength and toughness at the core and wear-resistant surfaces, such as gears, cams, slide valves, pistons, bushes, crank pins, piston pins, piston rings, couplings, shafts, bearing rings, etc. , this kind of steel can also be used as a low-carbon martensitic quenched steel to manufacture parts that do not require strict deformation but require strength and toughness. my country is a country with extremely poor chromium resources. Chromium is a strategic resource. The chromium element added to the material is mainly provided by imported chromium ore powder (part of which is chromium ore) and ferrochrome smelted in an electric furnace. However, a large amount of calcium-free chromium slag will be produced in the calcium-free roasting production line, which is not only wasted At the same time, the discharge of waste residues also increases the degree of pollution to the environment, which is not in the interests of enterprises and the country

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