Hot-rolled steel plate and preparation method thereof

A hot-rolled steel plate and skin-pass rolling technology, which is applied in metal rolling, metal rolling, tool manufacturing, etc., can solve the problems of large residual stress of hot-rolled steel plate, long production cycle, weak adaptability, etc., and achieve short production cycle , low cost and strong adaptability

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively large residual stress of the hot-rolled steel plate prepared by the prior art, and in the preparation process or need to establish a special heat treatment production line, or ne

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] The invention provides a method for preparing a hot-rolled steel plate. The method comprises: rough rolling, finish rolling, coiling, stack cooling and temper rolling of a slab, wherein the starting temperature of stack cooling can be 450- 750°C, the end temperature can be 0-100°C, and the elongation of temper rolling can be 0.1-2%.

[0015] In the present invention, in order to reduce the residual stress of the hot-rolled steel plate more effectively, preferably, the start temperature of the stack cooling can be 500-650°C, the end temperature can be 50-80°C, and the stack cooling The time can be 1400-2200min.

[0016] In the present invention, in order to reduce the residual stress of the hot-rolled steel sheet more effectively, preferably, the elongation of the temper rolling can be 0.5-1.5%.

[0017] In the present invention, the stack cooling means that the steel coil is placed in a hot-rolled steel plate whose temperature is close to that of the test coil after be...

Example Embodiment

[0023] Example 1

[0024] This embodiment is used to illustrate the preparation method of the hot-rolled steel plate provided by the present invention

[0025] According to Panzhihua Iron and Steel’s production process of P700L high-strength hot-rolled steel plate for automobile beams, the hot-rolled steel plate will be produced after rough rolling, finish rolling and coiling (the specification is thickness × width = 8.0 × 1300mm), of which the rough rolling Before the slab is heated and dephosphorized, fly shearing and dephosphorization are performed between rough rolling and finishing rolling, laminar cooling process is carried out between finishing rolling and coiling, and the stacking temperature is 660℃ in the middle of the steel. The temperature for starting stacking cooling is 500°C, the ending temperature for stacking cooling is 80°C, and the time for stacking cooling is 1400min. After the stack is cooled, temper rolling with an elongation rate of 0.5% is carried out...

Example Embodiment

[0026] Example 2

[0027] This embodiment is used to illustrate the preparation method of the hot-rolled steel plate provided by the present invention

[0028] According to Panzhihua Iron and Steel’s production process of PQ600 high-strength engineering and mechanical steel to produce hot-rolled steel plates, the slabs (specifications: thickness × width = 6.8 × 1250mm) after rough rolling, finish rolling and coiling, among which, before rough rolling The slabs are heated and dephosphorized, fly-sheared head and tail and dephosphorized between rough rolling and finish rolling, laminar cooling process is carried out between finish rolling and coiling, and stacked at 680°C middle of steel. The temperature for starting stack cooling is 650°C, the end temperature for stack cooling is 70°C, and the time for stack cooling is 1730min. After the stack is cooled, temper rolling with an elongation rate of 0.7% is carried out on a multi-roll skin pass mill. Then carry out bending formi...

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Abstract

The invention discloses a hot-rolled steel plate and a preparation method thereof. The preparation method comprises the following steps of: roughly rolling, finely rolling, coiling, stacking-cooling and smoothly rolling a plate blank, wherein the initial stacking-cooling temperature is 450-750 DEG C, the end temperature is 0-100 DEG C, and the ductility during smooth rolling is 0.1-2 percent. The hot-rolled steel plate and the preparation method thereof have the benefits that the smoothness of the hot-rolled steel plate prepared by the preparation method is less than 2 mm/m, and the sickle camber is less than 2.5 mm/10 m, so that the residual stress of the hot-rolled steel plate can be effectively reduced, and further, the plate shape can be effectively improved; meanwhile, with the adoption of the preparation method disclosed by the invention, a special heat treatment production line as well as a cover type annealing device or a burial pit and other production equipment are not needed, and the hot-rolled steel plate has the characteristics of simple process control, strong adaptability, energy conservation and emission reduction, short production period, low cost and the like.

Description

technical field [0001] The invention relates to a hot-rolled steel plate and a preparation method thereof. Background technique [0002] Residual stress is the stress that exists inside the component and maintains balance within the entire component when there is no working load. Hot-rolled strip steel will generate residual stress during rolling and cooling. Steel coils with residual stress During Kaiping and use, due to the release of stress, defects such as warping and camber will appear, which seriously affect the use of users. High-strength hot-rolled strip steel contains more alloy elements, the strengthening mechanism is complex, and the residual stress of the strip steel will be greater. For example, the phase transformation stress caused by the phase transformation expansion of the phase-transformation-strengthened high-strength steel plate makes the strip steel cool. Plastic strain may be generated during the process, resulting in residual stress, and the precipit...

Claims

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Application Information

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IPC IPC(8): B21B37/28B21B45/02
Inventor 张开华叶晓瑜邹小波李卫平罗许王海云
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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