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Super-thick steel plate and production technology thereof

A technology of extra-thick steel plate and production process, which is applied in the field of steel rolling, can solve the problems of poor internal quality, long production cycle, and take into account at the same time, and achieve the effects of high production efficiency, low production cost, and short production cycle

Inactive Publication Date: 2016-06-01
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an extra-thick steel plate and its production process in view of the problem that the plastic mold steel plate currently on the market cannot meet the special requirements for the thickness of the steel plate and the internal quality of the steel plate under this thickness. The billet is directly rolled on the wide and thick plate rolling mill for extra-thick steel plates for plastic molds. At the same time, the key process technical parameters are defined, thereby improving the internal quality of the extra-thick steel plates for plastic molds
The extra-thick steel plate produced by the invention can meet the level I flaw detection requirements of JB / T4730.3-2005 forging testing standard (Φ2mm equivalent flat-bottomed hole), and the maximum thickness of the steel plate can reach 430mm, which overcomes the original "die casting-ingot opening" Billet-reversible rolling mill or ingot forging process" high cost, complex process, poor internal quality, long production cycle, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Present embodiment is the production technology that adopts 700mm thick steel ingot to roll 190mm extra-thick steel plate for plastic mould, and production technology is carried out according to the following procedures:

[0026] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 33%, Si0.46%, Mn1.48%, P≤0.005%, S≤0.003%, Cr1.94%, Mo0.53%, Ni0.19%, the balance is Fe and unavoidable impurities, tapping pouring.

[0027] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 660°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce entrainment and secondary Sub-oxidat...

Embodiment 2

[0037] This implementation example is the production process of rolling 270mm thick steel plate for plastic moulds, using a 700mm thick steel ingot, and the production process is carried out according to the following procedures:

[0038] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 35%, Si0.49%, Mn1.52%, P≤0.006%, S≤0.004%, Cr2.06%, Mo0.57%, Ni0.21%, the balance is Fe and unavoidable impurities, tapping pouring.

[0039] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 670°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce entrainment and secondary Sub-oxid...

Embodiment 3

[0049] This implementation example is the production process of rolling a 350mm thick steel plate for plastic molds using a 900mm thick steel ingot. The production process is carried out according to the following procedures:

[0050] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 36%, Si0.50%, Mn1.56%, P≤0.007%, S≤0.004%, Cr2.1%, Mo0.59%, Ni0.22%, the balance is Fe and unavoidable impurities, tapped pouring.

[0051] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 680°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce the entrained gas and secondary Sub-oxid...

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Abstract

The invention belongs to the technical field of steel rolling and particularly relates to a super-thick steel plate and a production technology thereof. The super-thick steel plate includes, by weight, 0.31%-0.37% of C, 0.41%-0.59% of Si, 1.42%-1.59% of Mn, less than or equal to 0.007% of P, less than or equal to 0.004% of S, 1.91%-2.16% of Cr, 0.51%-0.63% of Mo, 0.17%-0.29% of Ni, and the balance Fe and inevitable impurities. The production technology includes the technical processes of electric furnace smelting, ladle furnace (LF) refining, vacuum degassing (VD), constant-speed die casting under argon shield, high-temperature demoulding, liquid core rolling, slow cooling, heating, rolling, online quenching and tempering. The Brinell hardness of the steel plate ranges from 291 HB to 329 HB, the value of difference between the surface hardness and the core hardness of the steel plate is smaller than 15 HB, the maximum thickness of the steel plate can reach 430 mm, and the steel plate can meet the I-class flaw detection requirement of the test standard of JB / T4730.3-2005 forge pieces and the requirement for high-quality interiors of high-class super-thick steel plates.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to an extra-thick steel plate and a production process thereof. Background technique [0002] With the rapid development of my country's plastics industry, plastic products are increasingly developing in the direction of large, complex and precise. In order to adapt to the development direction of plastic products with increasingly large sizes and complex shapes, the requirements for plastic mold steel are becoming more and more stringent. Especially when the thickness of steel for plastic molds increases, the internal quality of plastic mold steel plates is required to be excellent, and even some high-end users require that the ratings of various inclusions should not be greater than 1.5, and the internal defects of ultrasonic flaw detection ≤ Φ2mm equivalent flat-bottomed hole . [0003] At present, the competition for plastic mold steel plates in the domestic mar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/08C22C38/04C22C38/02C22C33/04C21D8/02
CPCC21D8/021C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
Inventor 肖丰强周兰聚孙德民杜平冯勇乔松麻世忠梁英蒋善玉王福同
Owner SHANDONG IRON & STEEL CO LTD
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