Method for reducing feature size of inclusions of bloom silicomanganese deoxidized steel bar and wire
A technology of silicomanganese deoxidized steel rod and characteristic size, which is applied in the field of iron and steel metallurgy, can solve the problems of cumbersome process and low control efficiency, and achieve the effect of reducing the characteristic size
Pending Publication Date: 2022-07-15
WUHAN UNIV OF SCI & TECH
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Problems solved by technology
However, in the above technical solution, the size of the inclusions is controlled by controlling multiple steps in the production process. This control process has the defects of cumbersome process and low control efficiency.
Method used
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Embodiment 1
[0041] S1. The chemical average composition of large-sized oxide inclusions with a size of more than 10 μm in the silicon-manganese deoxidized spring steel 55SiCr bloom produced on site is 38% SiO by SEM-EDS detection and analysis 2 -30%CaO-23%Al 2 O 3 -9% MgO, then, using Factsage thermodynamics software, the melting point corresponding to the above inclusions was calculated to be 1402 °C;
[0042] S2. Use chemically pure reagents to prepare 38% SiO 2 -30%CaO-23%Al 2 O 3 -9% MgO synthetic inclusions, then the synthetic inclusions were placed in a platinum crucible and heated to above 1550 ° C and kept for 120 min, then the heated synthetic inclusions were quenched into glass samples by water, and then dried, crushed, After grinding, the particle size is not more than 200 mesh powder;
[0043] S3. Coat the powder in step S2 on the hot wire, and use the single-filament method to measure the crystallization incubation time of the glassy inclusions at each isothermal point o...
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Abstract
The invention provides a method for reducing the characteristic size of inclusions in a bloom silicomanganese deoxidized steel rod wire, which comprises the following steps of: measuring a TTT curve of synthetic inclusions consistent with the chemical average composition of large-size oxide inclusions in a bloom by adopting a monofilament method, and then regulating and controlling a bloom cogging heating process according to the TTT curve, so as to reduce the characteristic size of the inclusions in the bloom silicomanganese deoxidized steel rod wire. The heating temperature and the heat preservation time of bloom cogging are always in a glass area on the left side of a TTT curve in the heating process, crystal transformation of inclusions is prevented, and then the feature size of the inclusions of the bloom silicomanganese deoxidized steel bar and wire is reduced. By means of the method for reducing the feature size of the inclusions of the bloom silicomanganese deoxidized steel rod and wire, the maximum size of the inclusions with the chemical average composition of 38% of SiO2, 30% of CaO-23% of Al2O3 and 9% of MgO in the rod and wire can be reduced to 20 microns from 35 microns, and the maximum size is reduced by about 43%.
Description
technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for reducing the characteristic size of inclusions in a large bloom silicon-manganese deoxidized steel bar and wire. Background technique [0002] To avoid Al 2 O 3 , MgO Al 2 O 3 Due to the harm caused by high melting point hard inclusions to the processing and performance of products, some special steel bars and wires are usually produced by the plasticizing process of silicon-manganese deoxidized inclusions. The plasticization control process of inclusions usually focuses on whether the inclusions are in the low melting point region. It is generally considered that CaO-SiO 2 -Al 2 O 3 The eutectic region of pseudowollastonite and anorthite and the adjacent low melting point region and MnO-SiO in the phase diagram 2 -Al 2 O 3 The spessartine garnet region in the phase diagram is the ideal chemical composition of plasticizing inclusions. Howe...
Claims
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IPC IPC(8): C21D8/06C21D11/00
CPCC21D8/065C21D11/00
Inventor 李建立孟耀青徐琦余岳朱航宇
Owner WUHAN UNIV OF SCI & TECH