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A scale control method for improving the corrosion resistance of hot-rolled plate

A technology of iron oxide scale and control method, which is applied in the field of metallurgy to achieve the effects of increasing investment and production costs, ensuring surface quality and corrosion resistance, and improving compactness

Active Publication Date: 2016-01-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research work on scale control in Japan and other countries mainly focuses on the structure analysis of scale and surface defects such as scale indentation, but does not involve how to control the structure of scale to improve the corrosion resistance of medium and thick plates.

Method used

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  • A scale control method for improving the corrosion resistance of hot-rolled plate
  • A scale control method for improving the corrosion resistance of hot-rolled plate
  • A scale control method for improving the corrosion resistance of hot-rolled plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Smelting molten steel and continuously casting it into a slab, the composition of the slab is C: 0.11%, Si: 0.15%, Mn: 1.05%, P: 0.007%, S: 0.004%, Al: 0.012%, Nb: 0.034%, V: 0.04%, the balance is iron;

[0025] Step 2: Heat the slab to 1250°C for 210 minutes; then use high-pressure water for coarse descaling. Iron oxide scale and mold slag, to achieve no residue;

[0026] Step 3: The slab after rough descaling enters the rough rolling stage, the starting rolling temperature is 1150°C, the final rolling temperature is 1120°C, and the cumulative reduction is 85%;

[0027] Step 4: The slab after rough rolling enters the finish rolling stage. Before the odd-numbered pass finish rolling stage, fine descaling is carried out. The water pressure of fine descaling is 18MPa, and the time of fine descaling is 6s. Descaling for 3 times; the final rolling temperature in the finishing rolling stage is controlled at 970°C, the cumulative reduction is 55%, and the steel thro...

Embodiment 2

[0036] Step 1: Smelting molten steel and continuously casting it into a slab, the composition of the slab is C: 0.09%, Si: 0.35%, Mn: 1.18%, P: 0.006%, S: 0.002%, Al: 0.023%, Nb: 0.04%, V: 0.036%, the balance is iron;

[0037] Step 2: Heat the slab to 1150°C for 300 minutes; then use high-pressure water for coarse descaling. Iron oxide scale and mold slag, to achieve no residue;

[0038] Step 3: The slab after rough descaling enters the rough rolling stage, the rolling start temperature is 1100°C, the final rolling temperature is 1000°C, and the cumulative reduction is 70%;

[0039] Step 4: The slab after rough rolling enters the finish rolling stage. Before the odd-numbered pass finish rolling stage, fine descaling is carried out. The water pressure of fine descaling is 20MPa, and the time of fine descaling is 5s. Descaling 2 times; the final rolling temperature in the finishing rolling stage is controlled at 840°C, the cumulative reduction is 80%, and the steel throwing spee...

Embodiment 3

[0043] Step 1: Smelting molten steel and continuously casting it into a slab, the composition of the slab is C: 0.07%, Si: 0.24%, Mn: 1.2%, P: 0.008%, S: 0.004%, Al: 0.04%, Nb: 0.034%, V: 0.038%, the balance is iron;

[0044] Step 2: Heat the slab to 1220°C for 260 minutes; then use high-pressure water for coarse descaling. Iron oxide scale and mold slag, to achieve no residue;

[0045] Step 3: The slab after rough descaling enters the rough rolling stage, the starting rolling temperature is 1130°C, the final rolling temperature is 1110°C, and the cumulative reduction is 78%;

[0046] Step 4: The slab after rough rolling enters the finish rolling stage. Before the odd-numbered pass finish rolling stage, fine descaling is carried out. The water pressure for fine descaling is 20MPa, and the time for fine descaling is 4s. Descaling for 3 times; the final rolling temperature in the finishing rolling stage is controlled at 940°C, the cumulative reduction is 76%, and the steel thr...

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Abstract

The invention provides a scale control method for improving the corrosion resistance of hot-rolled medium and thick plates, and belongs to the technical field of metallurgy. The control method of the present invention includes the following steps: smelting molten steel and continuously casting it into a slab, heating and insulating the slab and then rough descaling, the rough descaling pressure is greater than or equal to 16MPa, the rough descaling time is 4 to 10 seconds, and the fine rough rolling is followed by fine rolling. During the rolling stage, fine descaling is carried out before the odd-numbered finishing rolling stage. The fine descaling pressure is greater than or equal to 16MPa, and the fine descaling time is 4 to 10 seconds. After finishing rolling, the upper cooling bed is cooled at a speed of 10 to 25°C / s. to room temperature. The present invention proposes a hot rolling process adjustment plan for the scale structure of hot-rolled medium-thick plates. The cooling rate of the upper cooling bed is controlled by controlling the eutectoid reaction degree of FeO to achieve reasonable control of the scale structure, thereby improving the quality of the hot-rolled medium-thick plates. Regarding the surface corrosion resistance, the present invention utilizes the existing equipment and process conditions of the steel plant, does not increase investment and production costs, and improves the corrosion resistance on the basis of ensuring the mechanical properties of the hot-rolled medium and thick plates.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for controlling iron oxide scale for improving the corrosion resistance of hot-rolled medium-thick plates. Background technique [0002] Medium and heavy plate products are products with a relatively large proportion in hot-rolled products, and are generally sold directly as finished products. Most of the directly supplied medium and heavy plates have no outer packaging. During transportation and storage, due to the atmospheric corrosion of the environment and the local electrochemical crevice corrosion caused by water ingress and retention in the bales, the surface of the medium and heavy plates is rusted or exposed. Severe "pocket"-like corrosion morphology, which caused user quality objections. At present, there are many measures to improve the corrosion resistance of steel, but most of them focus on adding alloy elements such as Cr, Ni, and Cu to form a dense cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00B21B37/74B21B45/02B21B45/08C22C38/12C21D8/02
Inventor 曹光明刘振宇刘小江孙彬杨名何永全
Owner NORTHEASTERN UNIV LIAONING
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