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Production method for treating weathering steel for containers without sand blasting or shot blasting

A production method and container technology, applied in the field of hot-rolled strip production, can solve the problems of not considering the improvement of the surface condition of the coating object, the limitation of the scope of application, etc., to achieve good impact resistance, enhance competitiveness, and streamline production processes. Effect

Inactive Publication Date: 2013-12-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the environmental-friendly surface treatment technology for direct coating of steel surfaces without sandblasting and shot blasting is mainly concentrated in the field of sandblasting-free thermal spraying technology and the development and research field of sandblasting-free coatings, which focuses on coating Research on technology and paint without considering the improvement of the surface condition of the painted object, the scope of application is limited to a certain extent
There is no relevant report on the technology of controlling the surface condition of steel products to realize the technology of sandblasting and shot blasting treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Rolling 4.0×1300mm sandblast-free and shot-blast-free weathering steel for containers. Continuous casting slab thickness is 230mm, slab width is 1350mm, slab length is controlled at 9.8~10.0m, and the slab surface has no defects. The weight percent of the chemical composition of the slab is: C: 0.087%, Si: 0.23%, Mn: 0.44%, S: 0.005%, P: 0.092%, Cu: 0.301%, Cr: 0.390%, Ni: 0.128 %, the rest is iron and unavoidable impurities.

[0054] The heating temperature of the slab in the heating furnace is controlled at: 1220℃~1280℃, the discharge temperature is 1250℃, the heating furnace is in the furnace for 180min; the exit temperature of the rough rolling is 1080~1100℃, and the rough rolling pass is 5 passes , The descaling pass is 3 passes; the start-up temperature of the finishing mill is controlled at 980℃~1020℃, the final rolling temperature is between 850℃~880℃, and the rolling speed is 5.7m / s. Lubricating oil is added to each stand of finishing rolling. The surface roughne...

Embodiment 2

[0059] Rolling 4.0×1300mm sandblast-free and shot-blast-free weathering steel for containers. Continuous casting slab thickness is 230mm, slab width is 1350mm, slab length is controlled within 10.0~10.8m, and the slab surface has no defects. The weight percent of the chemical composition of the slab used is: C: 0.082%, Si: 0.20%, Mn: 0.48%, S: 0.005%, P: 0.092%, Cu: 0.301%, Cr: 0.388%, Ni: 0.128 %, the rest is iron and unavoidable impurities.

[0060] The heating temperature of the slab in the heating furnace is controlled at: 1220℃~1280℃, the discharge temperature is 1250℃, the heating furnace is in the furnace for 150min; the outlet temperature of the rough rolling is 1050~1080℃, and the rough rolling pass is 5 passes , The descaling pass is 4 passes; the start-up temperature of the finishing mill is controlled at 980℃~1020℃, the final rolling temperature is between 840℃~870℃, and the rolling speed is 6.0m / s. Lubricating oil is added to each stand of finishing rolling. The sur...

Embodiment 3

[0065] Rolling 4.0×1300mm sandblast-free and shot-blast-free weathering steel for containers. Continuous casting slab thickness is 230mm, slab width is 1350mm, slab length is controlled at 9.8~10.0m, and the slab surface has no defects. The weight percent of the chemical composition of the slab is: C: 0.085%, Si: 0.25%, Mn: 0.42%, S: 0.006%, P: 0.080%, Cu: 0.301%, Cr: 0.390%, Ni: 0.127 %, the rest is iron and unavoidable impurities.

[0066] The heating temperature of the slab in the heating furnace is controlled at: 1250℃~1260℃, the discharge temperature is 1240℃, the heating furnace is in the furnace for 160min; the exit temperature of the rough rolling is 1040~1080℃, and the rough rolling pass is 5 passes , The descaling pass is 5 passes; the start-up temperature of the finishing mill is controlled at 980℃~1020℃, the final rolling temperature is between 840℃~870℃, and the rolling speed is 6.2m / s. Lubricating oil is added to each stand of finishing rolling. The surface roughne...

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Abstract

The invention provides a production method for treating weathering steel for containers without sand blasting or shot blasting. The production method adopts the following hot rolling process flow: heating with a heating furnace, rough rolling, finish rolling, laminar cooling, coiling, air blast cooling, insulating with an insulation cover and finishing. The production method is characterized in that the initial rolling temperature of a finishing mill is controlled between 950 DEG C and 1020 DEG C, the finishing rolling temperature is controlled between 850 DEC C and 900 DEC C, the rolling speed is more than 5.5m / s and each finish rolling stand adopts lubricating rolling; the surface roughness Ra of the roller of the stand at the tail of the finishing mill is controlled between 0.8mu m and 2.4mu m; front-section rapid cooling is adopted on the laminar cooling stage, the cooling water is controlled to be alkalescent and the PH value is 7.0-10; the coiling temperature is controlled between 550 DEG C and 620 DEG C; the steel coil after coiling is put in the ventilative and convective place or a fan is adopted to improve ventilation and convection to cool the steel coil to 460-500 DEG C at a speed of 2-5 DEG C / min; then the steel coil is put into the insulation cover to be insulated, is taken out after the temperature drops to 200+ / -20 DEG C and is naturally cooled to the room temperature; and the chemical component Si of the adopted slab is controlled between 0.20% and 0.25%.

Description

Technical field [0001] The invention relates to a method for producing weather-resistant steel for containers without sand blasting and shot blasting, and belongs to the technical field of production of hot-rolled strips. Background technique [0002] Container transportation has the advantages of safety, speed, etc., and is especially suitable for the transportation of high value-added and easy-to-collision goods. Therefore, the container manufacturing industry has been greatly developed. Container steel requires that the steel used has excellent corrosion resistance, high mechanical properties, and good forming properties. Weathering steel is atmospheric corrosion resistant steel, which is characterized by adding Cu, P, Cr, Ni and other alloying elements to the steel to make it have good corrosion resistance in the atmosphere. Compared with carbon steel, weathering steel has outstanding atmospheric corrosion resistance and paintability, so it has been widely used in the field ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C21D8/02
Inventor 杨奕蒋扬虎韩斌谭文刘洋汪水泽陈丽娟汪荣
Owner 武汉钢铁有限公司
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