Method for preventing corrosion of high-manganese hot-formed steel after acid pickling

A hot-forming steel and hot-forming technology, applied in metal rolling and other directions, can solve problems such as corrosion, high price, damage to surface finish and processing accuracy, and achieve the effect of reducing pickling time, simple method, and preventing corrosion

Active Publication Date: 2020-09-15
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for preventing corrosion of high-manganese hot-formed steel after acid pickling
  • Method for preventing corrosion of high-manganese hot-formed steel after acid pickling
  • Method for preventing corrosion of high-manganese hot-formed steel after acid pickling

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Experimental program
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Effect test

Embodiment 1

[0041] A method for solving the corrosion of high manganese thermoforming steel after pickling:

[0042] Place the slab of high manganese hot-formed steel in a heating furnace and heat it to 1200°C at a rate of 45°C / min, stay at this temperature for 30 minutes, and the residual oxygen content in the heating furnace is ≤3%; heat the heated slab Rough rolling, a high-pressure nozzle is installed at the exit of the rough rolling mill. The shape of the nozzle of the high-pressure nozzle is flat oval, and the spray angle of the high-pressure nozzle is 30°. Enter the finish rolling mill, the inlet temperature of the finish rolling mill is 1010°C, start the double-pass descaling of the finish rolling mill, the rolling speed of the finish rolling mill is 8m / s, coil after finish rolling, the coiling temperature is 490°C, and the coiling temperature is 490°C, at 12°C / min The uncoiled slab enters the tension leveler, the bending roll insertion depth of the tension leveler is controlled a...

Embodiment 2

[0044] A method for solving the corrosion of high manganese thermoforming steel after pickling:

[0045] Place the slab of high manganese hot-formed steel in a heating furnace and heat it to 1180°C at a rate of 50°C / min, stay at this temperature for 35min, and the residual oxygen content in the heating furnace is ≤3%; Rough rolling, a high-pressure nozzle is installed at the exit of the rough rolling mill. The shape of the nozzle of the high-pressure nozzle is flat oval, and the spray angle of the high-pressure nozzle is 35°. Enter the finish rolling mill, the entrance temperature of the finish rolling mill is 1010°C, start the double pass descaling of the finish rolling mill, the rolling speed of the finish rolling mill is 8m / s, coil after finish rolling, the coiling temperature is 485°C, and the coiling temperature is 485°C, at 10°C / min The speed of cooling down to 60 ℃ is uncoiled; the uncoiled slab enters the tension leveler, and the insertion depth of the bending roll of ...

Embodiment 3

[0047] A method for solving the corrosion of high manganese thermoforming steel after pickling:

[0048] Place the slab of high manganese hot-formed steel in a heating furnace and heat it to 1210°C at a rate of 40°C / min, stay at this temperature for 25min, and the residual oxygen content in the heating furnace is ≤3%; Rough rolling, a high-pressure nozzle is installed at the exit of the rough rolling mill. The shape of the nozzle of the high-pressure nozzle is flat oval, and the spray angle of the high-pressure nozzle is 45°. Enter the finish rolling mill, the entrance temperature of the finish rolling mill is 1000°C, start the double-pass descaling of the finish rolling mill, the rolling speed of the finish rolling mill is 10m / s, coil after finish rolling, the coiling temperature is 480°C, and the coiling temperature is 480°C, at 15°C / min The speed of cooling down to 55 ℃ is uncoiled; the uncoiled slab enters the tension leveler, the bending roller insertion depth of the tens...

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Abstract

The invention relates to the technical field of metal material processing, in particular to a method for preventing corrosion of high-manganese hot-formed steel after acid pickling. The method comprises the following steps that a plate blank of the high-manganese hot-formed steel is placed in a heating furnace and is heated to 1180-1210 DEG C, and heat preservation at the temperature is carried out for 25-40 minutes; rough rolling is conducted on the heated plate blank, the plate blank enters a finishing mill, the inlet temperature of the finishing mill is 1000-1010 DEG C, and coiling and uncoiling are conducted after finish rolling; the uncoiled plate blank enters a withdrawal and straightening machine, the insertion depth of a bending roller of the withdrawal and straightening machine iscontrolled to be 5-15 mm, and a hot-rolled coil obtained after withdrawal and straightening and descaling enters an acid pickling stage; and the hot-rolled coil is rinsed after taken out, wherein thechloride ion content of rinsing water is less than or equal to 10 mg/L, drying is carried out after rinsing, oiling is carried out, and then coiling is carried out to complete the method for preventing corrosion. According to the method for preventing corrosion of the high-manganese hot-formed steel after acid pickling, by controlling the components of the high-manganese hot-formed steel, the keytemperatures and processes of rough rolling and finish rolling, controlling the rolling rhythm, controlling the withdrawal and straightening parameter and operation in other aspects, occurrence of corrosion of the high-manganese hot-formed steel after acid pickling can be effectively prevented, and the method is simple, high in applicability and remarkable in effect.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22C23G1/08C23G1/06C22C38/02C22C38/28C22C38/32C22C38/38
CPCB21B1/22C23G1/081C23G1/065C22C38/02C22C38/38C22C38/32C22C38/28B21B2001/225
Inventor 王畅于洋王林刘文鑫张亮亮高小丽王泽鹏李高峰张栋郭子峰陈瑾吴耐焦会立王凤美吴新朗
Owner SHOUGANG CORPORATION
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