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Cast steel and preparing method and application of cast steel

A technology of casting steel and molten steel, which is applied in the field of alloy materials, and can solve the problem that the low-temperature toughness of cast steel cannot meet the requirements of use in alpine regions

Inactive Publication Date: 2018-02-09
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a cast steel, a preparation method of cast steel and its application, so as to solve the problem that the low-temperature toughness of cast steel in the prior art is difficult to meet the use requirements of alpine regions

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  • Cast steel and preparing method and application of cast steel
  • Cast steel and preparing method and application of cast steel

Examples

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preparation example Construction

[0039] The tensile strength of the above-mentioned cast steel is greater than or equal to 550MPa, preferably the lower yield strength of the cast steel is greater than or equal to 360MPa, and the preferred elongation of the cast steel is greater than or equal to 20%; the preferred Charpy V-type impact energy absorption of the cast steel at -60°C Greater than or equal to 20J. In another typical embodiment of the present application, a method for preparing cast steel is provided. The preparation method includes: preparing metallic nickel, Fe-Mn alloy, and Fe-Cr alloy according to the composition of any of the above-mentioned cast steel. , Fe-Nb alloy, Fe-Si alloy, carbon powder, iron ore and steel scrap; melting and oxidation treatment of steel scrap and metal nickel to obtain molten iron oxide; reducing molten iron with carbon powder to obtain molten iron; adding Fe-Mn alloy, Fe-Cr alloy, Fe-Nb alloy and Fe-Si alloy into the water to obtain molten steel; and sequentially pourin...

Embodiment 1

[0049] The chemical composition (mass percentage) of the low-alloy medium-strength low-temperature cast steel of this embodiment is: carbon 0.22%, silicon 0.41%, manganese 0.80%, phosphorus 0.015%, sulfur 0.016%, chromium 0.36%, nickel 0.36%, Niobium 0.03%, the balance is iron and other unavoidable impurities, the unavoidable impurity content is less than 0.1%; the total content of phosphorus + sulfur in the cast steel of this embodiment is 0.031%.

[0050] Using scrap steel as raw material, the electric arc furnace redox method is used to make steel. The steps are as follows:

[0051] ① Loading, after cleaning and derusting the discarded carbon steel, put it into the furnace body of the electric arc furnace at the same time as metal nickel.

[0052] The particle size of the added carbon steel block is about 200x200x200mm, and the charge in the furnace body of the electric arc furnace is dense; in addition, the molten carbon ensures that the decarburization amount in the oxida...

Embodiment 2 to 18

[0064]The chemical compositions of the low-alloy medium-strength low-temperature cast steels of Examples 2 to 18 are shown in Table 1. The content of unavoidable impurities in the low-alloy medium-strength low-temperature cast steels of each example is less than 0.10%. And the smelting method and heat treatment method of the low-alloy cast steel in Embodiment 2 to Embodiment 18 are the same as Embodiment 1.

[0065] Table 1

[0066]

[0067]

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Abstract

The invention provides a cast steel and a preparing method and an application of the cast steel. The cast steel comprises the following components in a percent by mass: 0.12-0.22% of C, 0.3-0.6% of Si, 0.8-1.1% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S, 0.3-0.5% of Cr, 0.35-0.5% of Ni, 0.02-0.06% of Nb and the balance of Fe and unavoidable impurities. By reasonably arranging the adding quantity of alloy, the kinds and content of the added alloy are both few, and the components are easy to control. Therefore, the production cost of the cast steel is low,the content of the S and the P is controlled within the ranges, and the low-temperature toughness of the cast steel can be improved as much as possible. Through the cooperative use of the Cr and the Ni with the content, the cast steel has high impact toughness and can be used for manufacturing the related parts of goods wagons running in the low-temperature environments (-60DEG C) of severe cold regions.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to cast steel, a preparation method of cast steel and applications thereof. Background technique [0002] With the continuous growth of the national economy, my country's railway transportation industry and related industries have achieved considerable development. While meeting domestic demand, some products and related parts have entered the international market. In recent years, the export volume of railway wagons and related parts has continued to increase. [0003] Affected by the geographical environment, high-latitude alpine regions have higher requirements for the mechanical properties of truck parts, especially low-temperature toughness. For example, the enterprise standards of the Russian Locomotive and Rolling Stock Company generally require that the impact absorption energy of low-carbon alloy cast steel used in trucks at -60°C is not less than 17J. The B+ grade steel dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C38/02C22C38/04C22C33/06
CPCC22C33/06C22C38/02C22C38/04C22C38/48
Inventor 曹健峰徐海波赵延阔徐贵宝
Owner CRRC QISHUYAN INSTITUTE CO LTD
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