Method for measuring zero-strength temperature of steel
A measurement method and zero-strength technology, applied in the direction of material thermal development, etc., can solve problems such as internal cracking of slabs
Pending Publication Date: 2022-08-05
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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If this technology is not used properly, it will cause serious internal cracks in the slab, that is, cracks under light pressure
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[0026] The present invention will be described in further detail below with reference to the embodiments. It should be understood that the embodiments are exemplary and should not constitute any limitation to the technology claimed in the present application.
[0027] In this example, high-carbon bearing steel is taken as an example to measure the zero-strength temperature of high-carbon bearing steel. By interpreting the micro-crack points on the low-magnification longitudinal section of the casting billet, and then combining the simulation results of the continuous casting solidification model, the temperature can be obtained from the attached table. The zero-strength temperature is read out in the middle, which is a new method for measuring the zero-strength of steel, which is no longer limited to detection by thermal simulators. Specifically include the following steps:
[0028] (1) Taking the rectangular cross-section high carbon bearing steel as the research object, the ...
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The invention relates to a steel zero-strength temperature measurement method, which comprises the following steps of: 1, taking a casting blank subjected to soft reduction in a solidification process as a sampling object, and performing longitudinal low magnification and transverse low magnification on a casting blank sample; 2, measuring the distance h1 from the distribution line of the micro-cracks generated at the zero plasticity temperature to the surface of the casting blank on the low magnification of the casting blank sample, and measuring the distance h2 from the distribution line of the micro-cracks generated at the zero strength temperature to the surface of the casting blank; 3, the measured distances h1 and h2 are thicknesses after pressing deformation, and are corrected into distances h1 * and h2 * which are not slightly pressed; fourthly, a continuous casting solidification model is built through an alternate implicit difference method, temperature distribution of the cross sections of the casting blanks is simulated through the model, and the cross sections of the casting blanks at different positions correspond to different slice numbers; 5, calibrating the model to enable the model to be closer to an actual temperature field; and 6, finding out the slice number of the withdrawal and straightening machine correspondingly implementing soft reduction from the simulation result of the model, and reading the zero-intensity temperature from the temperature field according to the slice number.
Description
technical field [0001] The present invention relates to a method of measuring zero intensity temperature. Background technique [0002] Light reduction technology is one of the important means to improve the quality of billet segregation. If this technology is not used properly, it will cause serious internal cracking of the casting billet, that is, light pressure cracks. The investigation of cracks found that when the total amount of strain between the zero strength temperature and the zero plasticity temperature exceeds the critical strain, whether continuous or discontinuous, internal cracks will occur and propagate. From this fact, it can be concluded that the conditions for the formation of internal cracks in the slab should be evaluated by the total strain between ZST (zero strength temperature) and ZDT (zero plasticity temperature) applied by each roll. Therefore, it is necessary to know the zero plastic temperature and zero strength temperature of each steel when s...
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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 葛洪硕饶立华杜建峰任一峰王科峰
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD