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Production method for plastic mold steel refined cast ingot low in sulfur, phosphorus and inclusion content

A technology of plastic mold steel and low inclusions, applied in the field of metallurgy, can solve the problems of reducing the service life of the mold and low impact energy, etc.

Inactive Publication Date: 2019-07-16
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Problems solved by technology

[0004] The most fatal problem in 718 steel is the metallurgical purity, especially the control of non-metallic inclusions, sulfur, phosphorus, nitrogen, hydrogen, oxygen, and even slag inclusions, nitrides and other hard metal inclusions, resulting in extremely high impact energy. Low, greatly reducing the service life of the mold

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  • Production method for plastic mold steel refined cast ingot low in sulfur, phosphorus and inclusion content
  • Production method for plastic mold steel refined cast ingot low in sulfur, phosphorus and inclusion content
  • Production method for plastic mold steel refined cast ingot low in sulfur, phosphorus and inclusion content

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] In the embodiment of the present invention, a production method of 718 type plastic mold steel refined ingot with low sulfur, phosphorus and low inclusion content is provided, including the following steps, please refer to figure 1 :

[0026] Step 101: Smelting the raw materials through an electric furnace (EBT furnace) to obtain low-phosphorus molten steel:

[0027] In step 101, the raw materials are smelted in an electric furnace (EBT furnace) to obtain low-phosphorus molten steel.

[0028] Specifically, the raw materials used may be steel scrap concentrates. In addition, in this step, attention should be paid to controlling the content range of various elements in the raw materials in the smelting process, especially the content range of phosphorus, sulfur, and copper elements. Through practical experience, the 718 type plastic mol...

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Abstract

The invention relates to a production method for a plastic mold steel refined cast ingot low in sulfur, phosphorus and inclusion content. The production method comprises the following steps that a rawmaterial is subjected to production smelting through an electric furnace (EBT furnace), molten steel is obtained; the molten steel is refined through a refining furnace, and refined molten steel is obtained; the refined molten steel is processed through a vacuum degassing furnace, and molten steel subjected to vacuum degassing is obtained; argon blowing treatment is conducted on the molten steelsubjected to vacuum degassing, and molten steel subjected to argon blowing is obtained; and special mold casting is conducted on the molten steel subjected to argon blowing, and the steel ingot whichis low in hydrogen and nitrogen content and of which the solidification structure and component segregation are effectively controlled. According to the production method for the plastic mold steel, the large-size plastic mold steel which is high in purity and low in sulfur and phosphorus content can be produced, and the inclusion content and the contents of impurity elements including sulfur andphosphorus are effectively controlled.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing 718 plastic mold steel refined ingots with low content of sulfur, phosphorus and inclusions. Background technique [0002] Class 718 plastic mold steel is chromium-nickel-molybdenum alloy steel, which is an improved P20 steel grade developed on the basis of P20 (my country's brand 3Cr2Mo). ) Long-life thermoplastic injection molds, extrusion molds, blow molds and low-melting point alloys (such as lead, zinc, aluminum alloy) die-casting molds, such as household appliances, computer casings and refrigerator casings, etc. Plastic molds that require high finish. A steel with a special combination of high impact resistance and toughness is required, and has the characteristics of easy processing and heat treatment. In related technologies, its common production process may include liquid metal smelting and solid metal smelting. Liquid metal smelting refers t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/00C21C7/06C21C7/072
CPCC21C7/0056C21C7/06C21C7/072C21C7/10
Inventor 葛恒贵何广霞许晓红胡建国苗丕峰李经涛吴小林罗小云吴扬黄军韩雷
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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