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Oxide scale control method for improving corrosion resistance of hot rolled medium plate

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

Active Publication Date: 2014-08-06
NORTHEASTERN UNIV
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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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  • Oxide scale control method for improving corrosion resistance of hot rolled medium plate
  • Oxide scale control method for improving corrosion resistance of hot rolled medium plate
  • Oxide scale control method for improving corrosion resistance of hot rolled medium plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Smelting molten steel and casting into slab, the slab composition 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 210min; then use high-pressure water for rough descaling, the rough descaling temperature is 1200°C, the rough descaling water pressure is 16MPa, and the rough descaling time is 5s, so that the surface of the steel plate has no surface. Iron oxide scale and mold slag, to achieve no residue;

[0026] Step 3: The slab after rough descaling enters the rough rolling stage, the start 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 finishing rolling stage. Before the odd-numbered finishing rolling stage, the fine descaling is carried out. The fine descaling water pressure is 18MPa, and the fine descaling time is 6s. Descale 3 times...

Embodiment 2

[0036] Step 1: Smelting molten steel and casting into slab, the slab composition 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 300min; then use high-pressure water for rough descaling, the rough descaling temperature is 1100°C, the rough descaling water pressure is 18MPa, and the rough descaling time is 6s, so that the surface of the steel plate has no surface. Iron oxide scale and mold slag, to achieve no residue;

[0038] Step 3: The slab after rough descaling enters the rough rolling stage, the starting rolling 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 finishing rolling stage. Before the odd-numbered finishing rolling stage, the fine descaling is carried out. The fine descaling water pressure is 20MPa, and the fine descaling time is 5s. Descale twice;...

Embodiment 3

[0043] Step 1: Smelting molten steel and casting into slab, the slab composition 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 260min; then use high-pressure water for rough descaling, the rough descaling temperature is 1180°C, the rough descaling water pressure is 16MPa, and the rough descaling time is 5s, so that the surface of the steel plate has no surface. 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 finishing rolling stage. Before the odd-numbered finishing rolling stage, the fine descaling is carried out. The fine descaling water pressure is 20MPa, and the fine descaling time is 4s. Descale 3 tim...

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Abstract

The invention provides an oxide scale control method for improving the corrosion resistance of a hot rolled medium plate and belongs to the technical field of metallurgy. The control method comprises the steps that smelting molten steel is made into a plate billet in a continuous casting mode, and the plate billet is heated, subjected to heat preservation and then roughly descaled, wherein the rough descaling pressure is larger than or equal to 16 MPa, and the rough descaling time is 4-10 seconds; the plate billet is subjected to rough rolling and then finish rolling, and finish descaling is conducted before an odd number of secondary finish rolling stages, wherein the finish descaling pressure is larger than or equal to 16 MPa, and the finish descaling time is 4-10 seconds; after being subjected to finish rolling, the plate billet is placed onto a cooling bed and cooled to the room temperature at the speed of 10-25 DEG C per second. According to the control method, a hot rolling process adjustment scheme is proposed according to an oxide scale structure of the hot rolled medium plate; the cooling speed of the plate billet on the cooling bed is controlled, the oxide scale structure is controlled reasonably by controlling the eutectoid reaction degree of FeO, and therefore the corrosion resistance of the surface of the hot rolled medium plate is improved; since existing equipment and process conditions in a steel mill are utilized, investment cost and production cost are not increased, and the corrosion resistance of the hot rolled medium plate is improved on the basis of guaranteeing the mechanical properties of the hot rolled medium plate.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to an iron oxide scale control method for improving the corrosion resistance of hot-rolled medium and thick plates. Background technique [0002] Medium and heavy plate products are hot-rolled products with a larger proportion, 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, the surface of the medium and heavy plates is rusted or exposed due to the atmospheric corrosion of the environment and the local electrochemical crevice corrosion caused by the water ingress and retention of the packages. Serious "pitting"-like corrosion morphology, thus causing user quality objection. At present, there are many measures to improve the corrosion resistance of steel, but most of them focus on adding alloying elements such as Cr, Ni, and Cu to form a dense corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(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
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