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Production method of extra-thick high-purify plastic mold steel plate

A plastic mold and production method technology, applied in the field of metallurgy, can solve problems such as insufficient penetration and deformation of blanks, unguaranteed quality of steel plates, and insufficient compression ratio, etc., to achieve easy operation and reduce the process of forging blanks for electroslag remelting round ingots , smooth surface effect

Active Publication Date: 2016-07-27
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For plastic mold thick plates, the compression ratio is not enough due to continuous casting of slabs, and the internal penetration and deformation of the billets are not in place, so that the internal quality of the steel plate cannot be guaranteed, and defects such as trachoma and looseness are prone to occur, directly affecting subsequent processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The steel type in this example is WSM718R, the thickness of the steel plate is 275mm, and the compression ratio is 3.49; the composition weight percentages are: C: 0.36%, Si: 0.27%, Mn: 1.20%, P: 0.018%, S: 0.010% , Ni: 1.00%, Cr: 2.00%, Mo: 0.50%, TAl0.027%, the balance is Fe and unavoidable impurities.

[0027] Process steps: (1) Smelting process: including electric furnace steelmaking, LF refining and vacuum treatment steps; the electric furnace steelmaking step adopts ultra-high power electric arc furnace, selects high-quality raw materials, and adopts large slag flow slag operation during the melting period to avoid slag tapping ; After tapping, the molten steel is sent to the LF refining furnace for LF refining, rapid deoxidation and desulphurization, and the reducing slag is removed after adjusting the temperature and composition; re-making the reducing slag in the VD / VOD furnace for vacuum degassing treatment The medium vacuum is 67Pa and the holding time is 20m...

Embodiment 2

[0039] The steel type WSM718R in this embodiment has a steel plate thickness of 185mm and a compression ratio of 4.10; the composition weight percentages are: C: 0.35%, Si: 0.20%, Mn: 1.10%, P: 0.018%, S: 0.008%, Ni: 1.25%, Cr: 1.90%, Mo: 0.40%, TAl0.022%, the balance is Fe and unavoidable impurities.

[0040] The processing steps of the production method of the extra thick high-purity plastic mold steel plate are as follows:

[0041](1) Smelting process: including electric furnace steelmaking, LF refining and vacuum treatment steps; the electric furnace steelmaking step uses an ultra-high-power electric arc furnace, selects high-quality raw materials, and adopts a large slag flow operation during the melting period to avoid slag and tap the steel; Finally, the molten steel is sent to the LF refining furnace for LF refining, rapid deoxidation and desulphurization, and the reducing slag is removed after adjusting the temperature and composition; the reducing slag is recreated i...

Embodiment 3

[0053] The steel type WSMP20R of this embodiment has a steel plate thickness of 420 mm and a compression ratio of 2.28; the composition weight percentages are: C: 0.40%, Si: 0.36%, Mn: 1.50%, P: 0.020%, S: 0.010%, Cr: 1.80%, Ni: 0.05%, Mo: 0.50%, TAl 0.050%, the balance is Fe and unavoidable impurities, and the balance is Fe and unavoidable impurities.

[0054] Except for the following differences, the rest of the process steps are the same as in Example 1: (1) Smelting process: the vacuum degree is 65 Pa, and the vacuum is broken when the vacuum holding time is 30 minutes.

[0055] (3) Electroslag remelting process: Add Al particles at 30g / min; select a 700mm water-cooled crystallizer for remelting, and control the average melting rate at 20kg / min.

[0056] (5) Heating process: put the electroslag ingot into the furnace to simmer steel for 60 minutes, then use low-speed steel burning, the heating rate below 1000 ℃ is 120 ℃ / h, the maximum heating temperature is 1230 ℃, and the...

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Abstract

The invention discloses a production method of an extra-thick high-purify plastic mold steel plate. The production method comprises the steps of smelting, continuous casting, electroslag remelting, heating, rolling, annealing and heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.35%-0.40% of C, 0.20%-0.45% of Si, 1.10%-1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.05-1.25% of Ni, 1.8%-2.0% of Cr, 0.20%-0.50% of Mo, 0.020%-0.050% of Tal and the balance of Fe and inevitable impurities. In the production method of the extra-thick high-purify plastic mold steel plate, the electroslag remelting treatment is adopted; by means of reasonable control on the rolling and heat treatment processes, satisfaction of good comprehensive performance of a 420mm large-thickness steel plate and reduction of the production costs can be realized simultaneously; moreover, due to a large specification range, ever increasing market needs on amount are met.

Description

technical field [0001] The invention relates to a production method of an extra-thick and high-purity plastic mold steel plate, which belongs to the technical field of metallurgy. Background technique [0002] With the rapid development of the plastic industry, the demand for plastic mold steel has increased sharply, and plastic products are increasingly developing in the direction of large, complex and precise, such as washing machine cylinders, refrigerator inner chambers, and large color TV casings. At present, the competition for plastic mold steel plates in the domestic market is fierce, but the thickness of the steel plates is concentrated below 120mm. Many companies start to make steel and roll steel in an attempt to optimize material quality and improve product competitiveness. However, due to the limitation of continuous casting slab thickness, Plastic mold steel panels of greater thickness and superior internal quality cannot be produced. [0003] Since most high-...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D8/02C21D6/00C22C38/02C22C38/04C22C38/06C22C38/44
CPCC21D6/004C21D8/0257C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 邓建军张亚丽赵文忠韦明王青刘利香王会岭付冬阳宋庆吉刘丹张西忠张鹏云谷盟森赵喜伟
Owner WUYANG IRON & STEEL
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