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Production Method for Improving the Toughness of 10-12mm Thick Steel Plate with Yield Strength 345mpa

A yield strength and production method technology, applied in the field of material processing, can solve the problems of complex manufacturing process, increased manufacturing cost, increased energy consumption, etc., and achieve the effects of reduced management difficulty, loose process window and short production cycle

Active Publication Date: 2016-01-13
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature of the secondary rolling, the austenite grains cannot be effectively refined or broken during rolling, resulting in coarse grains of the finished steel plate, and mixed crystals are prone to occur, and the toughness of the final finished steel plate is poor
In order to improve the structure and toughness of thin steel plates, it is often necessary to heat treat thin steel plates. The heat treatment method is normalizing or quenching and tempering. After heat treatment, the toughness of steel plates is greatly improved, but heat treatment makes the manufacturing process of steel plates complicated, difficult to manage, and prolongs the manufacturing cycle. Increased manufacturing costs and increased energy consumption
Now there are many discussions and researches on improving the impact toughness of thick steel plates, but few studies on how to improve the impact toughness of thin steel plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The thickness of the slab is 250mm, the thickness of the finished steel plate is 10mm, the temperature of the slab out of the furnace is 1220°C, and the heating time is 270 minutes. The starting temperature of the first stage is 1210°C, the finishing temperature is 1010°C, the rolling speed is 2m / s, the thickness of the steel plate rolled in the first stage and the thickness of the starting rolling in the second stage are 30mm, and the high temperature extension rolling in the first stage The minimum reduction rate of a single pass is 12%, the first stage is rolled 8 passes; the second stage rolling thickness is 30mm, the second stage rolling is 5 passes, the second stage rolling temperature is 980°C, final rolling temperature 830°C, the thickness of the steel plate rolled in the second stage is 10mm, and the reduction rates of the single pass are 16.7%, 24%, 21.1%, 19.3%, and 16.7%, corresponding to the rolling of the pass The speeds are 3.5m / s, 3.8m / s, 4.2m / s, 4.5m / s,...

Embodiment 2

[0041] The thickness of the slab is 250mm, the thickness of the finished steel plate is 12mm, and the temperature of the slab out of the furnace is 1180°C. The heating time is 365 minutes, the starting rolling temperature of the first stage is 1170°C, the finishing rolling temperature is 1040°C, and the rolling speed is 1.5m / s; In the first stage of high-temperature elongation rolling, the minimum reduction rate of a single pass is 14%, and there are 7 passes in the first stage; The second-stage rolling temperature is 960°C, the final rolling temperature is 818°C, the thickness of the second-stage rolled steel plate is 12mm, and the single-pass reduction rates are 15.2%, 23.2%, 23.3%, 21.2%, and 15.4%, respectively. The rolling speeds corresponding to the passes are 3.6m / s, 3.8m / s, 4.1m / s, 4.6m / s, 4.9m / s respectively.

[0042] After the steel plate is rolled, it is straightened three times by a hot straightening machine, and the corresponding temperatures of each straightenin...

Embodiment 3

[0045] The thickness of the slab is 250mm, the thickness of the finished steel plate is 11mm, and the temperature of the slab out of the furnace is 1215°C. The heating time is 450 minutes, the first-stage rolling temperature is 1206°C, the final rolling temperature is 1032°C, and the rolling speed is 1.8m / s; In the first stage of high-temperature elongation rolling, the minimum reduction rate of a single pass is 14%, and there are 7 passes in the first stage (note: please add how many passes in the first stage); 33mm, the second stage rolled 5 passes, the second stage rolling temperature was 970°C, the final rolling temperature was 800°C, the thickness of the steel plate rolled in the second stage was 11mm, and the reduction rate of the single pass was 19.4 %, 24.1%, 22.7%, 18.8%, 13%, the rolling speeds of the corresponding passes are 3.4m / s, 3.7m / s, 4.2m / s, 4.4m / s, 4.6m / s respectively.

[0046] After the steel plate is rolled, it is straightened three times by a hot straigh...

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Abstract

The invention discloses a production method of improving toughness of a 10-12mm thick steel plate with yield strength of 345MPa grade. The method comprises the following steps: heating a slab which is 250mm thick, wherein the slab discharge temperature is 1180-1220 DEG C, and the heating time is 270-450 minutes; rolling the heated slab, wherein in the first stage rolling process, the start roll temperature is 1170-1210 DEG C, the rolling speed is 1.5-2m / s, the finish rolling temperature is greater than or equal to 1010 DEG C, the start roll thickness is the thickness of the slab: 250mm, and the single gate reduction rate of the steel plate in the first stage high temperature extended rolling is greater than or equal to 12%; in the second stage rolling process, the start roll thickness is three times the thickness of a finished steel plate, the start roll temperature is 960-980 DEG C, the finish roll temperature is 800-830 DEG C, the reduction rates of at least two gates are greater than or equal to 15%, the rolling speeds are sequentially 3-4m / s, 3.3-4.3m / s, 3.5-4.5m / s, 3.8-4.7m / s and 4-5m / s; the thickness of the steel plate straightened by a thermal straightener is 10-12mm.

Description

technical field [0001] The technology of the invention belongs to the field of material processing, and specifically relates to a production method for improving the toughness of a 10-12 mm thick steel plate with a yield strength of 345 MPa. Background technique [0002] Low-alloy high-strength steel plates with a yield strength of 345 MPa are widely used in various fields of the national economy. Now the country is vigorously developing clean energy wind power. The main material of the tower used to support the rotation of the blades is a low-alloy high-strength steel plate with a yield strength of 345MPa, of which 10-12mm thick steel plates account for a large proportion. These steel plates are all It is produced by a reversible wide and thick plate rolling mill. [0003] In order to improve the comprehensive mechanical properties of the steel plate, controlled rolling is generally used during rolling. Due to the thin thickness of the 10-12mm thick steel plate, it is easy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02
Inventor 温利军张大治刘海涛徐建东戴鑫王遐亮
Owner INNER MONGOLIA BAOTOU STEEL UNION