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Ultra-thick steel plate with high strength and high low-temperature toughness and production method thereof

A technology for low-temperature toughness and extra-thick steel plates, applied in temperature control, rolling mill control devices, metal rolling, etc., can solve the problems of high energy consumption and complicated process, and achieve the effect of simple production process, reasonable chemical composition and stable performance

Inactive Publication Date: 2011-07-20
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention adopts the process of controlled rolling and controlled cooling + normalizing. After rolling, the steel plate needs to be normalized. Two fires are used to form a material, which requires high energy consumption and a relatively complicated process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: EH36 ship plate steel produced in industry

[0018] Converter smelting EH36 ship plate steel, the weight percentage of the chemical composition of the steel is: C: 0.16%, Si: 0.36%, Mn: 1.38%, S: 0.002%, P: 0.011%, Nb: 0.033%, Ni: 0.30% , Ti: 0.018%, the steel is cast into a 300mm thick continuous casting slab by a conventional continuous casting method, and the slab is sent to a 4300mm wide and thick plate rolling mill for rolling, and the whole process of heating and rolling is controlled.

[0019] The hot rolling process is controlled as follows:

[0020] a. Control the heating of the continuous casting slab, the heating is controlled at 1200°C, the heating time is 340Min, and the temperature of the furnace is 1193°C; b. The slab is rough-rolled at 1170°C, and the rough rolling adopts 6-pass back-and-forth rolling. The steel temperature is 1141°C. After rough rolling, the thickness of the intermediate billet is 150mm; d, the starting temperature of fi...

Embodiment 2

[0022] Embodiment 2: EH36 ship plate steel produced in industry

[0023] Converter smelting EH36 ship plate steel, the weight percentage of the chemical composition of the steel is: C: 0.15%, Si: 0.33%, Mn: 1.39%, S: 0.002%, P: 0.013%, Nb: 0.036%, Ni: 0.31% , Ti: 0.012%, the steel is cast into a 300mm thick continuous casting slab by conventional continuous casting method, and the slab is sent to a 4300mm wide and thick plate rolling mill for rolling, and the whole process of heating and rolling is controlled. The hot rolling process is controlled as follows:

[0024] The hot rolling process is controlled as follows:

[0025] a. Control the heating of the continuous casting slab, the heating is controlled at 1200°C, the heating time is 335Min, and the furnace temperature is 1190°C; b. The slab is rough-rolled at 1170°C, and the rough rolling adopts 6-pass back-and-forth rolling. The steel temperature is 1125°C. The thickness of the intermediate billet after rough rolling is...

Embodiment 3

[0027] Embodiment 3: EH36 ship plate steel of industrial production

[0028] Converter smelting EH36 ship plate steel, the weight percentage of the chemical composition of the steel is: C: 0.15%, Si: 0.34%, Mn: 1.37%, S: 0.002%, P: 0.011%, Nb: 0.035%, Ni: 0.31% , Ti: 0.014%, the steel is cast into a 300mm thick continuous casting slab by conventional continuous casting methods, and the slab is sent to a 4300mm wide and thick plate rolling mill for rolling, and the whole process of heating and rolling is controlled. The hot rolling process is controlled as follows:

[0029] The hot rolling process is controlled as follows:

[0030]a. Control the heating of the continuous casting slab, the heating is controlled at 1185°C, the heating time is 320Min, and the temperature out of the furnace is 1170°C; b. The slab is rough-rolled at 1140°C, and the rough rolling adopts 6-pass back-and-forth rolling. The steel temperature is 1090°C. The thickness of the intermediate billet after r...

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Abstract

The invention relates to a method for producing an ultra-thick steel plate with high strength and high low-temperature toughness by adopting a controlled rolling process, in particular to a process for producing a hot rolling steel plate with high strength and high low-temperature toughness in the specification of 40-100mm by utilizing a continuous casting blank with the thickness of 250-300mm. The steel comprises the following chemical components in percentage by weight: 0.10-0.20% of C, 0.15-0.40% of Si, 1.20-1.60% of Mn, less than or equal to 0.015% of S, less than or equal to 0.015% of P, 0.010-0.050% of Nb, 0.25-0.50% of Ni, 0.01-0.02% of Ti and the balance of Fe and trace impurities. The product in the invention is reasonable in chemical composition design, the production process is simple, and the ultra-thick (maximum thickness can reach 100mm) high-quality hot rolled steel plate with high strength (tensile strength is more than 490MPa) and high low-temperature toughness (impact power at the temperature of minus 40 DEG C is more than 100J) can be produced by adopting a reasonable controlled rolling process.

Description

technical field [0001] The invention belongs to the field of steelmaking, and relates to a method for producing extra-thick steel plates with high strength and high low-temperature toughness, in particular to a method for producing extra-thick steel plates with high strength and high-low-temperature toughness by using a controlled rolling process. Background technique [0002] High strength and high toughness lead to the development direction of steel plate performance, especially for steel used in some special equipment or regions. Low-temperature toughness is very difficult. Many manufacturers adopt post-rolling heat treatment to produce high-strength, high-low-temperature tough steel plates with larger thickness specifications. In this way, not only increases the production cost, but also consumes more energy. Therefore, studying how to produce high-strength, high-low temperature toughness steel plates through simple processes can not only reduce production costs, but al...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/16B21B37/74
Inventor 周平王腾飞汤化胜麻衡孙其家陈爱娇任继银张鹏李新东
Owner SHANDONG IRON & STEEL CO LTD
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