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Hot continuous rolled steel plate and production method thereof

A production method, hot continuous rolling technology, applied in metal rolling, metal rolling, rolling mill control device, etc.

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

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the defect that the existing Q345 low-alloy high-strength hot-rolled steel plate requires a relatively high Mn content to maintain the strength of the steel plate, to provide a hot-rolled steel plate with a low Mn content and to add Ti to maintain the strength of the steel plate and its production method

Method used

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  • Hot continuous rolled steel plate and production method thereof
  • Hot continuous rolled steel plate and production method thereof
  • Hot continuous rolled steel plate and production method thereof

Examples

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Embodiment 1-3

[0033] This example is used to illustrate the hot-rolled steel sheet and its production method of the present invention.

[0034] After the molten iron is smelted, molten steel is obtained, and the molten steel is obtained through the continuous casting method as the continuous casting slab 1-slab 3 shown in Table 2, and the slab 1-slab 3 is controlled according to the control shown in Table 3 respectively. The parameters are rolled, including: soaking the slab 1-slab 3, then performing rough rolling several times, and finishing the intermediate slab obtained by rough rolling several times, and cooling the slab to the coil after finishing rolling. The temperature was taken for coiling to obtain Q345 low-alloy high-strength hot-rolled steel sheets P1-P3.

[0035] Table 2 Composition and thickness of slab

[0036]

[0037] The control parameter of table 3 production method

[0038]

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Abstract

The invention discloses a production method of a hot continuous rolled steel plate, the method includes sequential rough rolling, finish rolling, cooling and coiling of a plate blank, and the plate blank comprises the following components by weight: 0.1-0.2 wt% of C, less than or equal to 0.45 wt% of Si, 0.15-0.5 wt% of Mn, less than or equal to 0.025 wt% of P, less than or equal to 0.025 wt% of S, 0.08-0.2 wt% of Ti, and 98.6-99.7 wt% of Fe; and the cooling speed is 50 to 100 DEG C / s. The invention also discloses the hot continuous rolled steel plate prepared by the method. The yield strength ReL of the hot continuous rolled steel plate is greater than or equal to 345MPa, the tensile strength Rm is 470-630MPa, and the elongation rate A is greater than or equal to 21.0%.

Description

technical field [0001] The invention relates to a hot continuous rolling steel plate and an industrial production method of the steel plate. Background technique [0002] Low-alloy high-strength structural steel refers to the addition of a small or trace amount of alloying elements to ordinary carbon steel, through the development of a suitable controlled rolling and controlled cooling process, so as to obtain higher strength, better toughness and cold forming than ordinary carbon steel. A steel plate with greater capacity and better performance. This type of low-alloy high-strength structural steel is usually used in the hot-rolled state. Among them, the market demand for low-alloy high-strength structural steel (brand: Q345) with yield strength ≥ 345MPa is the largest, and GB / T 1591-2008 has a lower requirement for Q345. The chemical composition and mechanical property requirements of alloy high-strength structural steel are shown in Table 1. [0003] Table 1 Chemical co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14B21B37/16
Inventor 叶晓瑜张开华刘勇左军翁建军李卫平邹小波罗许
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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