Method of manufacturing ultralow-temperature steel through low-alloy steel
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A low-alloy steel and ultra-low temperature technology, which is applied in the field of machinery manufacturing and casting, can solve problems such as failure to meet low-temperature impact energy requirements, achieve the effects of reducing low-melting point compounds and brittle substances, increasing grain size grades, and increasing low-temperature impact energy.
Active Publication Date: 2015-03-11
SHAOGUAN XINSHIKE SHELL MOLDING
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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.
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[0014] Below in conjunction with embodiment the present invention is further described.
[0015] 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 0.16~0.18, Si is 0.20~0.38, Mn is 1.6~1.8, Al≤0.02, Cu≤0.01, S≤0.025, P≤0.025, RE is 0.12~0.24, Pb≤0.001 , Sn≤0.001.
[0016] The process steps are: smelting the above-mentioned low-alloy steel to reduce low-melting point compounds and brittle substances. During the oxidation period of smelting, the decarburization amount should not be less than 0.5%, and there should be no overoxidation to cause late carburization. When the phosphorus content of molten steel The reduction period can only be entered when it ...
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Abstract
The invention relates to a method of manufacturing ultralow-temperature steel through low-alloy steel, which comprises the steps of: setting the chemical ingredients and mass percents of the low-alloy steel as follows: 0.16-0.18% of C, 0.20-0.38% of Si, 1.6-1.8% of Mn, not larger than 0.02% of Al, not larger than 0.01% of Cu, not larger than 0.025% of S, not larger than 0.025% of P, 0.12-0.24% of Re, not larger than 0.01% of Pb and not larger than 0.01% of Sn; smelting the low-alloy steel to reduce the compounds with low smelting points and brittle substance, and entering the reducing period when the phosphor content of the molten steel is not larger than 0.02%, wherein the decarburization quantity is not lower than 0.5% at the smelting oxidization period, no peroxidation occurs to cause successive recarburization; and generating white slag and desulfurizing at the reducing period of the smelting procedure, and discharging and casting the steel when the sulfur content is smaller than 0.025%. 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 so as to improve the low-temperature impact power.
Description
technical field [0001] The invention belongs to the technical field of mechanical manufacturing and casting, and relates to a method for producing ultra-low temperature steel by using low alloy steel. Background technique [0002] The types and chemical compositions of common low-temperature steels are: [0003] The chemical composition % of steel 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 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. [0004] At present, the properties of low-temperature cast low-alloy steel in my country are: [0005] The steel type ZG16Mn heat treatment specification is 900°C normal...
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