Production method of 150-400mm thick steel plate for plastic moulds

A technology of plastic molds and production methods, applied in the field of metal materials, to achieve the effects of high yield, good comprehensive mechanical properties, and compact internal structure

Inactive Publication Date: 2013-01-30
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For steel plates with a thickness of more than 120 mm for plastic molds that are in greater demand in the market, du

Method used

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  • Production method of 150-400mm thick steel plate for plastic moulds

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Effect test

Embodiment 1

[0031] Embodiment 1: produce 150mm thick steel plate for plastic mould:

[0032]1) High-purity molten steel is smelted. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 0.8Torr for 10 minutes to further remove inclusions and gases. After double refining, the steel The gas content in the liquid is: [O] 12ppm, [H] 2.0ppm.

[0033] 2) The molten steel continuous casting process is protected throughout the pouring process, and technical means such as electromagnetic stirring and constant-speed pouring are adopted. The low-magnification analysis results of the cast slab have a central segregation of C class 0.5, and there are no defects such as intermediate cracks and looseness. The thickness of the continuous casting slab is 300mm, and the analysis results of the smelting composition are shown in Table 1:

[0034] Table 1 Example 1 Cont...

Embodiment 2

[0049] Embodiment 2: produce 150mm thick steel plate for plastic moulds

[0050] 1) Smelting of high-purity molten steel. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 0.8Torr for 12 minutes to further remove inclusions and gases. After double refining, the steel The gas content in the liquid is: [O] 11ppm, [H] 1.9ppm.

[0051] 2) The molten steel continuous casting process is protected throughout the pouring process, and technical means such as electromagnetic stirring and constant-speed pouring are adopted. The low-magnification analysis results of the cast slab have a central segregation of C class 0.5, and there are no defects such as intermediate cracks and looseness. The thickness of the continuous casting slab is 300mm, and the analysis results of the smelting composition are shown in Table 2:

[0052] Table 2 Example 2 Co...

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Abstract

The invention discloses a production method of a 150-400mm thick steel plate for plastic moulds and belongs to the field of metal materials. Continuous cast slab is used as raw material to produce the 150-400mm thick steel plate by the production method and comprises, by weight percent, 0.20-0.40% of C, 0.20-0.50% of Si, 1.00-1.60% of Mn, not more than 0.008% of S and P, 0.10-0.50% of Mo, 1.40-2.0% of Cr, 0.01-0.04% of V, and not more than 0.20% of other alloy elements (Nb, Ti and Ni). The high thickness slab can be produced by full-vacuum electron beam welding or by combined process of gas shielded welding, submerged-arc welding and vacuum electron beam welding and is then subjected to heating, rolling, slow cooling and heat treatment procedures, ultrasonic testing qualified rate of the produced steel plate for plastic moulds reaches more than 98%, the hardness is even, and the steel plate has excellent machinability, wear resistance and polishability and is suitable for production of various plastic moulds.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a process for producing 150-400 mm steel plates for plastic molds by using continuous casting slabs. Background technique [0002] With the rapid development of the plastic mold steel processing industry, the demand for plastic mold steel plates at home and abroad is becoming more and more diverse and widespread, and the requirements for high performance and low cost are becoming more and more urgent. Over the years, plastic mold steel has been mostly produced by die-casting steel ingots, blanking, rolling, and pre-hardening heat treatment. For products with a thickness above 120mm, the internal quality of the ingots cannot be guaranteed because the original defects of the ingots are difficult to eliminate; In recent years, some enterprises adopt the mode of electroslag remelting ingot for production to ensure the internal quality, but the products have disadvantages su...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 孙卫华赵乾马兴云崔健
Owner JIGANG GRP
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