A method for solving the corrosion of high manganese thermoforming steel after pickling

Abstract

The invention relates to the technical field of metal material processing, in particular to a method for solving the corrosion of high manganese thermoformed steel after pickling. The slab of high manganese thermoformed steel is placed in a heating furnace and heated to 1180-1210°C. Stay at the temperature for 25-40min; rough rolling the heated slab, the slab enters the finishing mill, the temperature at the entrance of the finishing mill is 1000-1010°C, coils after finishing rolling, and uncoils; the uncoiled slab enters the tension leveling machine , the insertion depth of the bending roll of the tension leveling machine is controlled at 5-15mm, and the hot-rolled coil after tension leveling and broken scale enters the pickling stage; take it out for rinsing, the chloride ion content of the rinsing water is ≤10mg / L, dry it after rinsing, and oil it It can be coiled, and the present invention can effectively prevent high manganese thermoformed steel from being corroded after pickling by controlling the composition of high manganese thermoformed steel, the key temperature and process of rough rolling and finish rolling, the control of rolling rhythm, and the control of tension and straightening parameters. The situation occurs, the method is simple, the applicability is strong, and the effect is remarkable.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for solving the corrosion of high manganese thermoformed steel after pickling. Background technique [0002] The hot-rolled strip and steel coil produced by the hot rolling mill is rolled and coiled. The oxide scale formed on the surface of the strip under corresponding conditions can firmly cover the surface of the strip and cover the surface of the strip. Defects. [0003] From the perspective of steel rolling, if these strips with scale are directly sent to the rolling mill for rolling, many problems will be caused: First, rolling under the condition of a large amount of down pressure will press the scale into the strip. The steel matrix affects the surface quality and processing performance of the cold-rolled sheet, and even causes waste products; second, the emulsion system that enters the cooling and lubricating roll after the oxide scale is brok...

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Problems solved by technology

[0003] From the perspective of steel rolling, if these strips with scale are directly sent to the rolling mill for rolling, many problems will be caused: First, rolling under the condition of a large amount of down pressure will press the scale into the strip. The steel matrix affects the surface quality and processing performance of the cold-rolled sheet, and even causes waste products; the second is that the emulsion system that enters the cooling and lubricating roll after the oxide scale is broken will damage the circulation equipment and shorten the service life of the emulsion; the third is to damage the surface. Rolls with high smoothness and processing accuracy and expensive

[0004] However, it is found in production that this series of high-manganese thermoforming steels are prone to rust defects after pickling, and large-scale yellow spots are formed on the surface, which affects the apparent quality of finished products

The rust defects of ordinary steel are closely related to the unclean rinsing of the pickling line, the wear of the squeeze roller or the uneven oiling. The occurrence of this kind of corrosion defect is still high, in view of this, it is urgent to propose a method to solve this kind of defect

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