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Preparation method of wide and thin hot-rolled steel plates with width-to-thickness ratio being greater than or equal to 500

A hot-rolled steel plate and thin-gauge technology, which is applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of poor stability of wide and thin-gauge steel plates and high scrap rate of steel plates, and achieve better temperature uniformity control and thickness The effect of high precision and small performance fluctuation

Inactive Publication Date: 2015-04-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, due to differences in equipment capabilities and parameters, as well as changes in the production environment, the production stability of wide and thin steel plates is still very poor, and the scrap rate of steel plates is high.

Method used

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  • Preparation method of wide and thin hot-rolled steel plates with width-to-thickness ratio being greater than or equal to 500

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, four blanks are stacked and assembled to produce a wide and thin Q235B steel plate with a thickness of 3mm and a width of 2m. The specific preparation method is as follows:

[0042] Material selection and processing: select four pieces of 2.5m×2.1m×54mm Q235B steel plates as blanks, and use a milling machine to process the surface of the blanks, remove the rust layer and oxide layer on the upper surface of two of the blanks, and clean the other two blanks. The upper and lower surfaces are processed so that fresh metal is exposed on the surface of the processed billet. The surface roughness of the processed billet is Ra3.2. The processing depth of the four sides of each billet is 10mm. The length and width of the four billets correspond to a deviation of about 2mm.

[0043] Release agent brushing: Divide the blanks to be laminated into one bottom layer blank, two middle layer blanks and one top layer blank, and perform surface isolation on the blanks: ...

Embodiment 2

[0051] In this embodiment, three blanks are stacked and assembled to produce a wide and thin Q345B steel plate with a thickness of 4mm and a width of 2.5m. The specific preparation method is as follows:

[0052] Material selection and processing: select three 3m×2.6m×74mm Q345B steel plates as blanks, and use a milling machine to process the surface of the blanks, remove the rust layer and oxide layer on the upper surface of two of the blanks, and clean the upper and lower surfaces of the other blank. The processing is carried out so that fresh metal is exposed on the surface of the processed blank. The surface roughness of the processed blank is Ra3.2. The processing depth of the four sides of each blank is 20mm. The length and width of the three blanks correspond to a deviation of about 1.5mm.

[0053] Release agent brushing: Divide the selected blanks to be laminated into a bottom layer blank, a middle layer blank and a top layer blank, and apply release agent to the surface...

Embodiment 3

[0060] In this embodiment, two blanks are stacked to form blanks to produce wide and thin Q420B steel plates with a thickness of 6mm and a width of 3.5m. The specific preparation method is as follows:

[0061] Material selection and processing: select two 3.5m×2.8m×150mm Q420B steel plates as blanks, and use a milling machine to process the surface of the blanks, remove the rust layer and oxide layer on the upper surface of one blank, and clean the upper and lower surfaces of the other blank. for processing. Fresh metal is exposed on the surface of the processed blank, the surface roughness of the processed blank is Ra3.2, the processing depth of the four sides of the blank is 40mm, and the corresponding length and width of the two processed blanks have a deviation of about 3mm.

[0062] Release agent brushing: Divide the selected blanks to be laminated into a bottom layer blank and a top layer blank, and apply release agent to the surface of the blanks: evenly apply release a...

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Abstract

The invention discloses a preparation method of wide and thin hot-rolled steel plates with the width-to-thickness ratio being greater than or equal to 500, which belongs to the technical field of multi-layer metal stacking rolling. According to the preparation method, a multi-layer blank combined rolling method is adopted for producing the wide and thin hot-rolled steel plates and is characterized in that two to four layers of blanks are combined and welded into a whole so that the temperature reduction is relatively slow in the rolling process and accordingly the fluctuation in performance of the heads and the tails of the steel plates are relatively small; meanwhile, multiple layers of blanks are combined for rolling, so that the total thickness of the combined steel plates is increased, and accordingly, the phenomena, such as wave, edge camber, steel stacking and misroll, occurring in the rolling process are obviously reduced, and the buckling phenomenon and the like tend not to occur in the cooling process. According to the invention, multiple layers of steel plates are combined for rolling, so that control over the temperature uniformity is better, and the thickness precision is higher after the steel plates are separated.

Description

technical field [0001] The invention relates to a method for preparing a hot-rolled steel plate, in particular to a method for preparing a hot-rolled steel plate with a wide and thin specification with an aspect ratio ≥ 500, and belongs to the technical field of multilayer metal laminated rolling. Background technique [0002] Wide and thin gauge hot-rolled steel plates are mainly used in industries such as bridges, containers, ships and construction machinery. Due to the extremely thin thickness of this type of steel plate (thickness is 3~8mm), and the large width (aspect ratio ≥ 500), during the rolling process, this type of steel plate is prone to problems such as wave shape, camber, stacked steel, and rolling waste; In addition, during the cooling process after rolling, the steel plate is prone to buckling due to the extremely thin steel plate resulting in too fast cooling. Especially for high-strength wide and thin steel plates, the cooling process is more serious. Be...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B47/00B21B47/04
CPCB21B1/38B21B47/00B21B47/04B21B2001/386
Inventor 党军曾周燏江姗全才
Owner NANJING IRON & STEEL CO LTD
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