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Ultralow temperature steel

An ultra-low temperature, chemical composition technology applied to ultra-low temperature steel. field, it can solve the problems of not being able to meet the requirements of low-temperature impact energy, and achieve the effects of reducing low-melting point compounds and brittle substances, increasing the grain size grade, and improving low-temperature impact energy

Inactive Publication Date: 2016-10-05
重庆沁煌实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the minimum operating temperature is -175°C, instead of using high-alloy steel, the modified ZG16Mn is used instead of high-alloy steel, which cannot meet the low-temperature impact energy requirements.

Method used

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with embodiment:

[0010] A method of using low-alloy steel to produce ultra-low temperature steel. When setting the chemical composition of low-alloy steel, it is based on the premise of not adding precious metals, so as to obtain the best strength and toughness of the casting, thereby increasing the low-temperature impact energy. The set The chemical composition of low alloy steel is as follows: C is 0.19~0.21, Si is 0.20~0.38, Mn is 1.7~2, Al≤0.01, Cu≤0.005, S≤0.015, P≤0.015, RE is 0.1~0.3, Pb≤0.0015 , Sn≤0.001.

[0011] The process steps are: the process steps are: smelting the above-mentioned ultra-low temperature steel to reduce low-melting point compounds and brittle substances. During the oxidation period of smelting, the amount of decarburization is not less than 0.4%. When the phosphorus content of molten steel is not more than 0.01%, it enters the reduction period; during the reduction peri...

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PUM

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Abstract

The invention relates to ultralow temperature steel. The ultralow temperature steel comprises the following chemical components by mass percentage: 0.19-0.21% of C, 0.20-0.38% of Si, 1.7-2% of Mn, less than or equal to 0.01% of Al, less than or equal to 0.005% of Cu, less than or equal to 0.015% of S, less than or equal to 0.015% of P, 0.1-0.3% of RE, less than or equal to 0.0015% of Pb, and less than or equal to 0.001% of Sn. During the smelting process, S and P, especially P of the low-alloy steel is controlled to the minimum margin to reduce the compounds with low smelting points and the brittle substance; TES is added at a reduction period, unit crystal nucleus quantity at a solidification period is increased, so that the grain size grade is increased; when the chemical components of the low alloy steel are set, Mn / C is controlled, optimum intensity and toughness can be obtained, and thereby, the low temperature impact energy is increased.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing and casting, and relates to an ultra-low temperature steel. Background technique [0002] The types and chemical compositions of common low-temperature steels are: the chemical composition of steel grade ZG16Mn% C: 0.12~0.2, Si: 0.20~0.50, Mn: 1.2~1.6, S≤0.045, P≤0.04; the chemical composition of steel grade ZG09Mo2V % C: ≤0.12, Si: 0.20~0.50, Mn: 1.4~1.8, R: 0.02~0.03, V: 0.02~0.08, S≤0.04, P≤0.04; steel grade ZG06MnNb chemical composition % C: ≤0.07, Si0 .17~0.37, Mn: 1.6~1.8, Nb: 0.03~0.04, V: 0.02~0.08, S≤0.03, P≤0.03; steel grade ZG06AlNbCuN chemical composition % C: ≤0.08, Si≤0.35, Mn: 0.8~ 1.28, Al0.04~0.15, Cu0.3~0.4, N0.01~0.015, Nb0.04~0.08, S≤0.035, P≤0.02. [0003] At present, the properties of low-temperature cast low-alloy steel in my country are: steel type ZG16Mn heat treatment specification 900°C normalizing 600°C tempering, V-notch impact energy J (-40°C) 12, u...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/16
Inventor 赵伟
Owner 重庆沁煌实业有限公司