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Reduce production method of low-alloy high-strength thick steel plate

A low-alloy high-strength, manufacturing method technology, applied in the field of extra-thick steel plate rolling technology, can solve problems such as reducing production efficiency, and achieve the effects of improving production efficiency, saving energy, and saving rolling time

Inactive Publication Date: 2009-12-09
QINHUANGDAO SHOUQIN METAL MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if multiple sets of rolling are used, the average temperature control time of each steel plate needs to be increased by 1-2 minutes, which reduces the production efficiency

Method used

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  • Reduce production method of low-alloy high-strength thick steel plate
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  • Reduce production method of low-alloy high-strength thick steel plate

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Experimental program
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Effect test

Embodiment Construction

[0019] According to the chemical composition range of the Q345 extra-thick plate of the present invention, it is smelted on a 100-ton converter and continuously cast into a continuous casting slab of 250mm×2400mm×L, and rolled on the Shouqin wide and thick plate production line with 60, 70, and 85mm steel plates. The chemical composition is shown in Table 1, the rolling process is shown in Table 2, the mechanical properties are shown in Table 3, and the metallographic structure is shown in Table 2. figure 1 shown

[0020] The chemical composition (weight, %) of table 1 example extra thick plate

[0021]

[0022] Table 2 Rolling process system

[0023]

[0024] Table 3 Mechanical property test results

[0025]

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Abstract

The invention relates to a reduce production method of low-alloy and high-strength thick steel plate, belonging to the technical field of super-thick steel plate rolling technology. The controlled technological parameters are as follows: rolling technology: heating temperature ranges from 1150 DEG C to 1180 DEG C, tapping temperature is controlled to range from 1080 DEG C to 1130 DEG C, the heating speed ranges from 0.8mm / min to 0.9mm / min, Austenite recrystallization zone rolling is adopted as the rolling technology, and the final rolling temperature ranges from 950 DEG C to 1050 DEG C; cooling process after rolling: laminar cooling is adopted, final cooling temperature ranges from 650 DEG C to 750 DEG C, the cooling rate ranges from 3 DEG C / s to 10 DEG C / s. The method of the invention has the advantages that moderate amount of Mn is added to the super-thick plate, no other alloy element is added, as a result, production cost is greatly reduced; the rolling does not need to adopt controlled rolling, thus each steel plate can save 1-3 minutes of rolling time, the energy is saved, and the production rhythm is speeded up; the comprehensive properties are as follows: yield strength sigmas is 300-360MPa, tensile strength sigmab is 500-550MPa, percentage elongation delta5 is greater than or equal to 26%, ballistic work AKv at the temperature of minus 20 DEG C is greater than or equal to 50J, cold gagging property is qualified.

Description

technical field [0001] The invention belongs to the technical field of extra-thick steel plate rolling technology, and mainly relates to a method for manufacturing Q345 series low-alloy high-strength thick steel plates with a thickness of 50-100 mm (excluding 50 mm). , used to replace controlled rolling and controlled cooling and heat treatment microalloyed Q345 series thick plate production. Background technique [0002] my country's "National Medium and Long-Term Science and Technology Development Plan (2006-2020)" clearly stated that it is necessary to develop a new generation of steel production process to realize the three main functions of steel production, namely, the provision of steel products, energy conversion, and waste treatment. . As the material processing process of the main link of the steel material production process, how to realize the reduction, produce economical steel products, and promote the sustainable development of my country's social economy is a...

Claims

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Application Information

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IPC IPC(8): C21D8/02
Inventor 王根矶白学军王国栋何元春赵德文张学峰李婧隋鹤龙顾林豪李书琴
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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