Rolling method for controlling tissue homogeneity of high strength hot rolled steel plate

A hot-rolled steel plate with uniform structure technology, applied in temperature control, metal rolling, etc., can solve the problems of increasing workload and production costs, and achieve the goals of saving the length of rolling process, improving market competitiveness, and reducing rolling costs Effect

Active Publication Date: 2018-12-07
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of heat treatment technology to regulate the tissue will inevitably increase the workload and production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Hot-rolled high-strength steel with a tensile strength of 560MPa is rolled from a 230.0mm slab hot-rolled raw material, and the product thickness is 16.0mm. The uniformity control method of the structure:

[0018] ①Heating the slabs for the production of hot-rolled high-strength steel in a combined heating furnace to control the uniformity of the heating temperature of the slabs, and control the maximum temperature difference in the width, length, and thickness directions of the slabs below 18°C ​​when they are released from the furnace;

[0019] ②A method for controlling microstructure uniformity of hot-rolled high-strength steel plates, using a four-high reversing roughing mill to rough-roll the slab. During the rolling process, the rolling speed of the four-high reversing mill was controlled at 2.0m / S.

[0020] ③ A method for controlling microstructure uniformity of a hot-rolled high-strength steel plate, using a four-high reversing roughing mill to rough-roll the sl...

Embodiment 2

[0025] Hot-rolled high-strength steel with a tensile strength of 700MPa is rolled from 230.0mm slab hot-rolled raw materials, and the product thickness is 12.0mm. The residual stress control method:

[0026] ①Heating the slabs for the production of hot-rolled high-strength steel in a combined heating furnace to control the uniformity of the heating temperature of the slabs, and control the maximum temperature difference in the width, length, and thickness directions of the slabs below 15°C when they are released from the furnace;

[0027] ②A method for controlling microstructure uniformity of hot-rolled high-strength steel plates, using a four-high reversing roughing mill to rough-roll the slab. During the rolling process, the rolling speed of the four-high reversing mill was controlled at 2.5m / S.

[0028] ③ A method for controlling microstructure uniformity of a hot-rolled high-strength steel plate, using a four-high reversing roughing mill to rough-roll the slab. During eac...

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Abstract

The invention discloses a rolling method, in particular a rolling method for controlling tissue homogeneity of a high strength hot rolled steel plate, and belongs to the technical field of steel platerolling processes. The invention provides the rolling method for controlling tissue homogeneity of the high strength hot rolled steel plate effectively by improving the rolling step and the parameters thereof. The rolling method comprises the following steps: uniform temperature heating and temperature different controlling discharging, intermediate speed rough rolling of a four reversible reversing roughing mill, surface temperature control finish rolling by a seven-rack continuous mill and cooling by a laminar cooling unit which controls inner and outer temperature conditions. In the intermediate speed rough rolling process of the four reversible reversing roughing mill, a high pressure water descaling nozzle at the inlet of the four reversible reversing roughing mill is opened to descale and cool the surface of strip steel, so that the surface temperature of the strip steel is reduced by 80-120 DEG C.

Description

technical field [0001] The invention relates to a rolling method, in particular to a rolling method for controlling the microstructure uniformity of a high-strength hot-rolled steel plate, and belongs to the technical field of steel plate rolling technology. Background technique [0002] Hot-rolled steel plate is an important raw material widely used in the construction of the national economy. Usually, hot-rolled rolling mills are used to roll hot-rolled strip steel or single-stand / double-stand reversing rolling mills are used to roll medium-thick steel plates. With the improvement of downstream users' requirements for product quality, the quality requirements for hot-rolled steel sheets as raw materials are also getting higher and higher, especially for steel sheets with a thickness ≥ 10mm in the thickness direction. high. As we all know, when the uniformity of the thick-gauge hot-rolled steel plate in the thickness direction is poor, impact damage may occur in the subseq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
CPCB21B37/74B21B2201/06
Inventor 李俊洪罗许刘序江肖强
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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