Flat steel ingot for corrosion-resistant mold and process method thereof

A process method and a flat steel ingot technology are applied in the field of flat steel ingots, flat steel ingots for corrosion-resistant molds, and flat steel ingots for production of the corrosion-resistant molds, which can solve the problem of insufficient utilization of discarded metals, cumbersome smelting process, and effective unfavorable resources. Utilize and other problems to achieve the effect of reducing vanadium content, good melting performance, improving nitrogen fixation efficiency and reaction speed

Active Publication Date: 2021-11-16
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The smelting of high-nitrogen steel in the prior art is either filled with nitrogen, or directly put into the metal containing nitrogen, and the smelting process is relatively cumbersome, and the smelting process needs to be kept in a certain state of very high pressure. Waste metals are not fully utilized, which is not conducive to the effective use of resources

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  • Flat steel ingot for corrosion-resistant mold and process method thereof
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specific Embodiment

[0041] The present invention relates to a method for preparing high-nitrogen die steel by composite injection and adding nitrogen-enriched iron-manganese-based materials. The purpose of the present invention is to provide a method for smelting high-nitrogen die steel with normal pressure specifications, so as to solve the problems raised in the above-mentioned background technology question.

[0042] In order to achieve the above object, the present invention provides the following technical solutions: a method for preparing high-nitrogen mold steel by composite injection and adding nitrogen-enriched ferromanganese-based materials, the high-nitrogen plastic mold steel of the present invention, its chemical composition contains the following elements by mass percentage: C0.25~0.65%, Si 0.4~0.8%, Mn 0.4~0.9%, Cr 12~18%, Ni 0.05~0.3%, Mo 0.1~0.3%, N 0.06~0.30%, Al≤0.02%, P≤ 0.020%, S≤0.005%, and the rest are Fe and unavoidable impurity elements. Include the following steps:

[...

Embodiment 1

[0054] In the implementation example of the present invention, the high-nitrogen plastic mold steel contains the following elements by mass percentage in its chemical composition: C0.35%, Si 0.48%, Mn 0.51%, Cr 12.5%, Ni 0.12%, Mo 0.16%, N 0.16%, Al : 0.016%, P: 0.017%, S: 0.003%, and the rest are Fe and unavoidable impurity elements. Include the following specific steps:

[0055] 1) Select IF steel billet scraps according to the above chemical composition: C 0.0024%, Si 0.014%, Mn 0.16%, P0.011%, S 0.006, Al 0.013%, the balance is Fe and other unavoidable impurities, and placed in an electric furnace Carry out primary refining, the temperature is 1640±10°C, and the pressure in the furnace is 1 standard atmospheric pressure. Pour low-carbon clean molten steel into the LF furnace, blow argon, and add slagging agents (lime, fluorite, lime sand, aluminum oxide) after 6 minutes to obtain molten steel with a nitrogen content of 38ppm;

[0056] 2) Use a refining furnace for refini...

Embodiment 2

[0064] In the implementation example of the present invention, the high-nitrogen plastic mold steel contains the following elements in mass percent: C0.42%, Si0.54%, Mn0.43%, Cr13%, Ni0.11%, Mo0.15%, N0.21%, Al : 0.018%, P: 0.018%, S: 0.004%, and the rest are Fe and unavoidable impurity elements. Include the following specific steps:

[0065] 1) Select IF billet scraps according to the above chemical composition: C 0.0027%, Si 0.016%, Mn 0.16%, P0.011%, S 0.006, Al 0.013%, the balance is Fe and other unavoidable impurities, and put it in the electric furnace Carry out primary refining, the temperature is 1643±5°C, and the pressure in the furnace is 1 standard atmospheric pressure. Pour low-carbon clean molten steel into the LF furnace, blow argon, and add slagging agents (lime, fluorite, lime sand, aluminum oxide) after 6 minutes to obtain molten steel with a nitrogen content of 42ppm;

[0066] 2) Use a refining furnace for refining with a large amount of slag. After slaggin...

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Abstract

The invention discloses a flat steel ingot for a corrosion-resistant mold and a process method thereof, belonging to the technical field of metallurgical production process. To provide a flat steel ingot for corrosion-resistant molds with high strength, corrosion resistance, wear resistance, creep resistance, and fatigue resistance, and the application also provides a process for producing the flat steel ingot for corrosion-resistant molds . The flat steel ingot is a metallurgical die-cast steel ingot containing the following components in parts by weight: C 0.25-0.65%, Si 0.4-0.8%, Mn 0.4-0.9%, Cr 12-18%, Ni 0.05-0.3% , Mo 0.1-0.3%, N 0.06-0.30%, Al≤0.02%, P≤0.020%, S≤0.005%, and the rest are Fe and unavoidable impurity elements. The process method includes several steps of smelting molten steel with a nitrogen content less than or equal to 45ppm, refining nitrogen-rich and manganese-rich molten steel, and die casting, wherein the refining of nitrogen-rich and manganese-rich molten steel includes large slag in a refining furnace Quantitative refining and secondary refining in vacuum refining furnace.

Description

technical field [0001] The invention relates to a flat steel ingot, in particular to a flat steel ingot for a corrosion-resistant mold, and belongs to the technical field of metallurgical production technology. The invention also relates to a process method for producing the flat steel ingot for the corrosion-resistant mold. Background technique [0002] In the past, nitrogen was often associated with the brittleness of steel in smelting steel, but nitrogen is also a cheap alloying element, and its beneficial effects have been gradually discovered and used. In high-nitrogen steel, when nitrogen interacts with other elements in the steel, it can endow the steel with many excellent properties, such as good strength and toughness, high creep resistance, good corrosion resistance, and significant reduction of intermetallic phase σ at high temperature opportunity for separation. Nitrogen is initially used as an austenitic element to replace nickel to save element nickel in aust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C33/06C21C7/10C21C7/064C22C35/00
CPCC21C7/0645C21C7/10C22C33/06C22C35/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 罗许肖强吴欣蓉刘序江蔡武
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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