Method for eliminating residual stress of hot-rolled strip steel in high-temperature state

A hot-rolled strip steel, high-temperature state technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of high heating and cold processing costs, large investment in heat treatment equipment, straightening equipment, high investment costs, etc., to achieve The effect of reducing equipment investment, shortening storage time, and reducing power consumption

Active Publication Date: 2021-11-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The heat treatment equipment and straightening equipment used in the above-mentioned stress relief method have a large investment, and the cost of heating and cold processing is relatively high; in addition, the yield strength of the hot-rolled strip sometimes reaches Above 1000Mpa, the maximum specification has reached 25.4mm (thickness) × 2000mm (width). Large-scale products require a very powerful straightening machine, which makes the investment cost higher

Method used

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  • Method for eliminating residual stress of hot-rolled strip steel in high-temperature state
  • Method for eliminating residual stress of hot-rolled strip steel in high-temperature state
  • Method for eliminating residual stress of hot-rolled strip steel in high-temperature state

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Experimental program
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Effect test

Embodiment 1

[0088] In this embodiment, the steel grade of the hot-rolled strip steel is ordinary carbon steel Q235B, and the product specification is 2.5mm (thickness)×1250mm (width).

[0089] The physical parameters are as follows in Table 3

[0090] Table 3 Physical parameters of high temperature hot rolled strip

[0091]

[0092] The parameters of the online thermal straightening unit to be installed are shown in Table 4.

[0093] Table 4 Parameters of high temperature straightening unit

[0094]

[0095] After the laminar cooling process and before the coiling process in the hot-rolled strip production line, install an 11-roll straightening machine with a roll diameter of 305 mm and a hot straightening force of 3.34 tons (which can replace the off-line straightening unit with a cold straightening force of 4.94 tons). ) for online control of residual stress in hot-rolled strips.

[0096] In this embodiment, compared with the conventional cold straightening method, the comprehe...

Embodiment 2

[0098] In this embodiment, NM400 wear-resistant steel plate is produced, and the product specification is 12×2000mm. The physical parameters are as follows in Table 5

[0099] Table 5 Physical parameters of high temperature hot rolled strip

[0100]

[0101] The parameters of the online thermal straightening unit to be installed are shown in Table 6

[0102] Table 6 Parameters of high temperature straightening machine

[0103]

[0104] In this embodiment, after the laminar flow process and before the coiling process of the hot-rolled strip production line, a 5-roll straightening machine is installed, the roll diameter is 662 mm, and the hot straightening force is 41.66 tons (the alternative cold straightening force is 127.81 tons). off-line straightening unit), which is used to realize on-line control of residual stress of hot-rolled strip.

[0105] In this embodiment, compared with the conventional cold straightening method, the comprehensive investment cost of equip...

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Abstract

The invention relates to a method for eliminating residual stress of hot-rolled strip steel in a high-temperature state, a straightening unit is additionally arranged between a continuous rolling finishing mill and a coiling machine of a hot continuous rolling production line, and the hot-rolled strip steel after finish rolling directly enters the straightening unit, is straightened in the high-temperature state and then enters the coiling machine to be coiled. The strip steel is straightened through rolling waste heat, so that the capacity requirement of straightening equipment is greatly reduced, secondary heating is not needed, and energy consumption is reduced; and a conventional off-line stress control mode of the hot-rolled strip steel is improved into an on-line stress control mode, the economical and efficient targets are achieved, and a precedent of on-line control of the residual stress index of the hot-rolled strip steel is created.

Description

technical field [0001] The invention relates to the technical field of strip steel production, in particular to a method for eliminating residual stress of hot-rolled strip steel in a high temperature state. Background technique [0002] During the rolling and cooling process of hot-rolled sheets and strips, due to uneven thermal deformation, uneven thermal expansion, uneven phase transformation, uneven grain size, etc., various stresses of different sizes exist everywhere in the steel coil, which must be overcome. The traditional method is to take measures such as stress relief annealing and straightening after the steel strip is cooled to eliminate the internal stress of the steel strip, or to make the internal stress of the steel strip uniform. , to ensure that the subsequent parts of the steel strip are straight, and ultimately ensure the machining accuracy of various parts. [0003] The heat treatment equipment and straightening equipment used in the above stress relie...

Claims

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Application Information

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IPC IPC(8): B21B15/00B21D1/02C21D8/02
CPCB21B15/00B21D1/02C21D8/0242C21D8/0205B21B2015/0057Y02P10/20
Inventor 张华王洪海王鑫刘威史乃安于斌景鹤关菊陈晓楠李庆贤马良秦勉韩天杰张守峰王尊呈
Owner ANGANG STEEL CO LTD
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