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Method for controlling plate shape of hot-rolled thin-specification high-strength weather-resistant steel

A technology for shape control and weathering steel, applied in rolling mill control devices, metal rolling, temperature control, etc., can solve the problems of low order fulfillment rate of thin gauge high-strength weathering steel, increased production costs, adverse effects on performance, etc. Plasticity, Deformation Resistance Reduction, Effect of Deformation Resistance Reduction

Active Publication Date: 2019-12-31
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the shape of the steel coil, measures such as slow cooling of the steel coil off the line and increasing the temper rolling force have been taken. It has been verified that the shape of the steel coil has not been significantly improved. It has adverse effects and is prone to secondary defects. Some steel coils still cannot meet the user's requirements after secondary leveling, and can only be downgraded. As a result, the order fulfillment rate of thin-gauge high-strength weathering steel is low, and the The production cost and the control level of thin-gauge plate shape seriously affect the mass production of thin-gauge high-strength weathering steel

Method used

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  • Method for controlling plate shape of hot-rolled thin-specification high-strength weather-resistant steel
  • Method for controlling plate shape of hot-rolled thin-specification high-strength weather-resistant steel
  • Method for controlling plate shape of hot-rolled thin-specification high-strength weather-resistant steel

Examples

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Embodiment 1

[0029] This embodiment provides a method for controlling the shape of hot-rolled thin-gauge high-strength weathering steel. After heating the smelted continuous casting slab, it goes through rough descaling, constant width press, rough rolling, flying shear, and fine descaling. , finishing rolling, laminar cooling, coiling and leveling to obtain the finished product, the specific process is as follows:

[0030] S1. Continuous casting slab heating: when the slab is heated, a walking heating furnace is used, the temperature of the slab soaking section is 1268°C, and the soaking section time is 30 minutes. The furnace temperature is 1265°C, and the heating time is 210min. Realize weak reductive soaking, and the measured value of the residual oxygen analyzer in the soaking section is less than 1.0%.

[0031]Specifically, during the heating process of the slab, the slab is heated sequentially through the preheating section, the first stage of heating, the second stage of heating a...

Embodiment 2-3

[0046] This embodiment provides a flat shape control method for hot-rolled thin-gauge high-strength weather-resistant steel. The process parameters are different, and the difference of the process parameters is as shown in Table 1-7. Except for the difference of the parameters shown in the table, the rest of the process parameters and operations are consistent with Example 1. The process parameters involved are as follows:

[0047] In the production method of hot-rolled thin-gauge high-strength weathering steel provided in this embodiment, the comparison between the slab heating process parameters and Embodiment 1 is shown in Table 1:

[0048] Table 1 Slab Heating Process Parameters

[0049]

[0050]

[0051] In the production method of hot-rolled thin-gauge high-strength weathering steel provided in this embodiment, the comparison between the heating atmosphere in the slab heating process and that of Example 1 is shown in Table 2:

[0052] Table 2 Heating atmosphere ...

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Abstract

The invention provides a method for controlling the plate shape of hot-rolled thin-specification high-strength weather-resistant steel. The method comprises the steps of reasonably designing a heatingprocess, controlling the thickness of a rough-rolled intermediate billet, adopting low sleeve quantity for finish rolling, enabling the angle of a loop to be less than 20 DEG C, and enabling the large sleeve lifting torque to be 1.5-2.0 times of set tension, cooling water between F1 and F2 racks is increased to realize a final rolling high-acceleration mode, a front rack plate strip large-convexity self-stabilization control strategy and a rear rack equal-proportion convexity plate shape control strategy are adopted for the plate shape, edge shielding, sectional control cooling and off-line slow cooling measures are adopted in the cooling process, the plate shape of high-strength thin-specification weather-resistant steel is greatly improved, and unevenness of the strip steel is less thanor equal to 3.0mm / m. and batch stable production of hot-rolled thin-specification high-strength weather-resistant steel is realized.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a shape control method of hot-rolled thin-gauge high-strength weather-resistant steel. Background technique [0002] At present, weathering steel with a yield strength of 355MPa is widely used in the land and sea transportation industry, and it is made into containers and railway carriages with a large dead weight. The resulting fuel consumption and transportation costs during land and sea transportation are huge, and at the same time pollute the environment. Therefore, there is an urgent need for mass production of high-strength and thin-gauge weathering steel. Due to the high strength level of high-strength weathering steel, in order to ensure the strength, a certain amount of alloying elements such as Ti and Ni are added in the composition design, resulting in a large rolling load and poor production stability, which is not conducive to the fulfillment of ...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B37/74B21B37/00B21B45/00B21B45/02
CPCB21B1/463B21B37/00B21B37/74B21B45/004B21B45/0203
Inventor 刘晓翠张转转徐伟周娜王秋娜李文远倪友金姚利苹
Owner BEIJING SHOUGANG CO LTD
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