Production method for large-thickness Q500-grade steel plate

A production method and large-thickness technology, applied in the field of metallurgy, can solve problems such as high internal quality, unstable guarantee, low-cost price, etc., achieve high production efficiency, excellent internal quality, and ensure the quality of billets

Inactive Publication Date: 2019-11-15
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention solves the problem that high-strength steel plates with a thickness of more than 300 mm cannot be stably ensured by high internal quality and low cost price by the die-casting method, and the phenomenon of welding cracks and cracking of the composite layer cannot be solved in the production of such steel plates by vacuum composite technology

Method used

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  • Production method for large-thickness Q500-grade steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The thickness of Q500D steel plate in this example is 300mm, its chemical composition and mass percentage are: C: 0.16%, Mn: 1.7%, V: 1.53%, N: 125ppm, B: 0.0018%, and other components meet GB / T1591 requirements.

[0019] The production method of the large-thickness Q500 grade steel plate in this embodiment includes blank making, heating, rolling, and heat treatment processes, and the specific process steps are as follows:

[0020] (1) Billet making process: 2 billets of the same size and furnace number are used for composite billet making; after spot welding and centering process, the billets are put into a small heating furnace and preheated by electric heating in a vacuum chamber , the preheating temperature is 300°C, and the holding time is 30 minutes; when vacuum welding, use two vacuum electron beam welding guns for welding, one of which is used for small energy welding, and the welding line energy is 20KJ / cm 3 , another electron beam gun welding line energy 30KJ...

Embodiment 2

[0026] The thickness of Q500D steel plate in this example is 320mm, its chemical composition and mass percentage are: C: 0.18%, Mn: 1.85%, V: 1.72%, N: 183ppm, B: 0.0022%, and other components meet GB / T1591 requirements.

[0027] The production method of the large-thickness Q500 grade steel plate in this embodiment includes blank making, heating, rolling, and heat treatment processes, and the specific process steps are as follows:

[0028] (1) Billet making process: 2 billets of the same size and furnace number are used for composite billet making; after spot welding and centering process, the billets are put into a small heating furnace and preheated by electric heating in a vacuum chamber , the preheating temperature is 350°C, and the holding time is 35 minutes; when vacuum welding, two vacuum electron beam torches are used for welding, one of which is used for small energy welding, and the welding line energy is 22KJ / cm 3 , another electron beam gun welding line energy 37K...

Embodiment 3

[0034] The thickness of Q500C steel plate in this example is 340mm, its chemical composition and mass percentage are: C: 0.19%, Mn: 1.72%, V: 1.90%, N: 230ppm, B: 0.0027%, and other components meet GB / T1591 requirements.

[0035] The production method of the large-thickness Q500 grade steel plate in this embodiment includes blank making, heating, rolling, and heat treatment processes, and the specific process steps are as follows:

[0036] (1) Billet making process: 2 billets of the same size and furnace number are used for composite billet making; after spot welding and centering process, the billets are put into a small heating furnace and preheated by electric heating in a vacuum chamber , the preheating temperature is 380°C, and the holding time is 40 minutes; during vacuum welding, two vacuum electron beam torches are used for welding, one of which is used for small energy welding, and the welding line energy is 24KJ / cm 3 , another electron beam gun welding line energy 4...

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Abstract

The invention discloses a production method for a large-thickness Q500-grade steel plate, and the method comprises the processes of blanking, heating, rolling and heat treatment; after the spot welding and centering process, the blank is loaded in a small heating furnace to be preheated in a vacuum chamber by electric heating in the blanking process, the preheating temperature is 300-500 DEG C, the heat preservation time is 30-50min; when in vacuum welding, two vacuum electron beam welding guns are used for welding, one electron beam welding gun performs small-energy welding, the energy of a welding line is 20-25 KJ/cm3, and the energy of the other electron beam welding gun line is 30-50 KJ/cm3. The production method realizes the production of the steel plate with the thickness of 300-350mm through the reasonable vacuum composite welding blanking process and the subsequent homogenization heating technology and the rolling technology under the atmosphere, and the thick tensile performance satisfies the section shrinkage rate Z greater than or equal to 35%, and the flaw detection of the steel plate can be above GB/T2970 -2004 III grade or above.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a large-thickness Q500 grade steel plate. Background technique [0002] With the development of high-strength steel in the market towards large thickness, large unit weight, high quality and low cost requirements, high-strength steels with a thickness of more than 300mm, 460MPa, 550MPa, etc. have been applied in large quantities in the field of international / domestic mold and engineering platform processing , but few domestic manufacturers can produce, and the manufacturers that can produce mainly use the die-casting process for production, but they have not formed mass production. It was not until 2012 that the die steel with a thickness of more than 300mm exceeded 20,000 tons, which was far below the market demand and could not be favored by foreign customers. [0003] Domestic production of high-strength steel plates above 300mm by die-ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D1/28C22C38/04C22C38/12B21B1/38B23K15/06
CPCB21B1/38B21B2001/386B23K15/06C21D1/28C21D8/0226C21D8/0263C22C38/04C22C38/12C22C38/32
Inventor 李建朝刘丹赵国昌龙杰刘生付冬阳袁平付振坡赵晓辉师帅
Owner WUYANG IRON & STEEL
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