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Process for producing die steel by utilizing converter continuous casting mode

A die steel and converter technology, applied in the field of metallurgy, can solve problems such as cracking of finished products and unqualified die steel flaw detection, and achieve the effects of eliminating thermal stress and structural stress, improving unqualified flaw detection and cracking of finished products, and improving purity

Active Publication Date: 2013-06-19
冀南钢铁集团有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The technical problem to be solved in the present invention is to provide a process for producing mold steel using a converter-continuous casting method that saves energy consumption, is low-cost and can be continuously produced, and at the same time solves the problems of unqualified flaw detection of mold steel and cracking of finished products.

Method used

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Embodiment Construction

[0037] Below in conjunction with embodiment the present invention is described in further detail:

[0038] The raw materials required for the production of the present invention need to be optimized, and the main raw materials include: pure molten iron, scrap steel, slagging agent, alloy raw materials and mold slag. Pure molten iron is smelted by blast furnace first, and then undergoes pretreatment processes such as slag removal, desulfurization, and dephosphorization to obtain molten iron that meets the composition requirements of die steel, of which P<0.1%; S<0.030%, and Si is 0.30% to 0.50%. Lime and lightly burned dolomite are used as the slagging agent. The CaO content in the slagging agent should be higher than 85%, and the activity degree should be greater than 280. In addition, the slagging agent should also ensure cleanness, dryness and proper firing rate. Alloy raw materials and mold flux are baked to reduce moisture before use. The alloy raw material is baked with...

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Abstract

The invention discloses a process for producing die steel by utilizing a converter continuous casting mode. The process comprises a steel making continuous casting process and a steel rolling process. The steel making continuous casting process comprises the following process steps of: converter smelting, LF (Ladle Furnace) refining, continuous casting, slow cooling and other process steps; and the steel rolling process comprises the following process steps of: heating, scale removal by using high pressure water, rolling, straightening, stacking, slow cooling and other steps. By using the die steel produced by the invention, the contents of gas and occluded foreign substances in the die steel can be reduced, the thermal stress and the structural stress for slowing a steel blank down are eliminated, a thick and nonuniform cast structure inside the steel blank is improved, and the problems of flaw detection disqualification and finished product crack of the die steel are solved. By using the process, the aim of producing the die steel by using a converter is achieved, the production cost is reduced, and the economic benefit is increased.

Description

technical field [0001] The invention relates to a metal material production method in the field of metallurgy, in particular to a process for producing mold steel by using a converter-continuous casting method. Background technique [0002] Mold is the main production and processing tool for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. The quality of the mold directly affects the quality of the pressure processing process, the precision of the product, the output and the production cost. The quality and service life of the mold are not only guaranteed by reasonable structural design and machining accuracy, but also the material and heat treatment of the mold steel used in the production of the mold are also important factors affecting the quality of the mold. Die steel mainly refers to the steel used to make molds such as cold stamping dies, hot forging dies and die-casting dies. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00B22D11/16B21B37/74
Inventor 闫宗根李海强李宏洲张东
Owner 冀南钢铁集团有限公司
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