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A smelting method for obtaining qualified mechanical properties at low temperature without nickel

A technology with mechanical properties and low temperature, applied in the field of smelting, it can solve the problems such as the lack of stable production of -40 ℃ castings, and achieve the effect of benefiting magnesium absorption and stable spheroidization reaction

Active Publication Date: 2015-09-09
泉州共享智能铸造产业创新中心有限公司
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Problems solved by technology

[0003] So far, there is no report of stable production of castings at -40°C

Method used

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  • A smelting method for obtaining qualified mechanical properties at low temperature without nickel

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Embodiment Construction

[0017] A smelting method for obtaining qualified mechanical properties at a low temperature without nickel, characterized in that the method includes the following steps:

[0018] a. Melting: The charge is accurately weighed, and added in the order of scrap steel, returned iron, and pig iron. During the melting process, the charge is compacted at any time. After the cold charge is melted, the temperature is quickly raised to a sampling temperature of 1420°C to 1440°C, and the spectral sample is taken for inspection. Continue to raise the temperature to around 1440-1460°C to stop the furnace, leave the molten iron for slag removal, and adjust the composition of the molten iron to the target value according to the test results of the spectral sample;

[0019] b. Embedding of nodulizers and inoculants: rush into the spheroidization process, clean up the ladle first, and then bury the nodulizers with fast detonation in the nodulization reaction chamber, and put the nodulizers with ...

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Abstract

The invention relates to a smelting method, particularly a smelting method for acquiring qualified mechanical properties under low-temperature nickel-free conditions, which is characterized by comprising the following steps: melting, embedding a nodulizer and an inoculator, tapping, and casting a test block. The method provided by the invention is unique, can acquire higher tensile strength and elongation percentage, enables the matrix structure of the test block to contain less pearlite, enhances the nodularity of the test block, and ensures the quality and low-temperature impact value of the casting on the premise of reasonably selecting chemical composition.

Description

technical field [0001] The invention relates to a smelting method, in particular to a smelting method for obtaining qualified mechanical properties at low temperature without nickel. Background technique [0002] At present, the low-temperature material market has broad prospects. Domestic academic research mainly focuses on heat treatment after nickel addition and alloying to obtain a qualified -40°C impact value. However, nickel addition is used in actual production, the production cost is high, and there are high requirements for heat treatment equipment. And the stability of the smelting technology is not high. Mechanism and actual results show that the addition of nickel does not reduce the low-temperature impact transition temperature, and its increase in impact value is also based on the increase in strength. [0003] So far, there is no report on the stable production of castings at -40°C. Contents of the invention [0004] The purpose of the present invention is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/10C22C37/04C21C1/10
CPCY02W30/54Y02P10/20
Inventor 王蒙尤国庆张守全马志刚孙升陈孝先徐国强周文
Owner 泉州共享智能铸造产业创新中心有限公司
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