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Method for measuring dendritic crystal spacing of chalcogenide free-cutting steel continuous casting billet

A free-cutting steel and dendrite spacing technology, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of time-consuming and laborious, complicated experimental process, limited analysis area, etc., and achieves accurate dendrite spacing value and simple measurement method. Effect

Active Publication Date: 2020-04-17
SHOUGANG CORPORATION
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  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for measuring the distance between dendrites of continuous casting slabs of chalcogenide free-cutting steel, which solves the problem that the analysis area of ​​existing measuring methods is relatively limited, The experimental process is complicated, time-consuming and labor-intensive, etc.

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  • Method for measuring dendritic crystal spacing of chalcogenide free-cutting steel continuous casting billet
  • Method for measuring dendritic crystal spacing of chalcogenide free-cutting steel continuous casting billet
  • Method for measuring dendritic crystal spacing of chalcogenide free-cutting steel continuous casting billet

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Embodiment Construction

[0017] The specific embodiments of the present invention will be described below in conjunction with the drawings.

[0018] A method for measuring the dendrite spacing of continuous casting slabs of sulfur-based free-cutting steel. The specific steps and parameters are as follows:

[0019] 1. Sample preparation

[0020] First, cut a block sample from the core area of ​​the cross section of the chalcogenide free-cutting steel continuous casting billet. The size of the sample is 30mm in length, 18mm in width, and 20mm in thickness. Then the sample is cleaned, ground and polished, and then placed Enter the scanning electron microscope sample room for analysis and testing, and set the working distance suitable for backscattered electron analysis and energy spectrum analysis to about 10mm.

[0021] 2. Automatic statistical analysis of non-metallic inclusions in steel

[0022] Open the automatic analysis software of Aztec Steel inclusions, set the SEM acceleration voltage, probe current, mag...

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Abstract

The invention discloses a method for measuring dendritic crystal spacing of a chalcogenide free-cutting steel continuous casting billet, and belongs to the technical field of metal material detection.The method comprises the following specific steps and parameters: firstly, cleaning, grinding and polishing a sample, and then putting into an electron microscope for analysis; then carrying out automatic statistical analysis on the non-metallic inclusions; adjusting the current of the probe to enable the dead time of the free-cutting steel sample under the electron beam to reach 20-30%; and thelike; carrying out closed operation image processing to obtain an inclusion distribution diagram spliced by all fields of view, screening according to elements and content information of the inclusiondistribution diagram, and judging the inclusion with the S content of more than or equal to 0.1 percent and the Mn content of more than or equal to 0.1 percent as manganese sulfide inclusion; obtaining a manganese sulfide inclusion distribution diagram; and finally, averaging more than or equal to 10 positions to obtain a final measurement value of the secondary dendrite spacing. The method has the advantages that the method is simple and convenient, the measured dendrite spacing value is accurate, the analysis scanning areas can be continuously spliced, and the measurement area is more than100mm < 2 >.

Description

Technical field [0001] The invention belongs to the technical field of metal material detection, and particularly relates to a method for measuring the dendrite spacing of a sulfur-based free-cutting steel continuous casting slab. Background technique [0002] The sulfur-based free-cutting steel uses sulfur as the main free-cutting element. The sulfur content is usually controlled between 0.20% and 0.40%, and the highest is 0.60%. The sulfur content in its steel is generally several times higher than that of ordinary steel. Elements are generally removed as impurity elements. In free-cutting steel, its higher sulfur elements can combine with manganese in steel to form manganese sulfide MnS inclusions. Manganese sulfide, as a favorable inclusion, segregates during the solidification of molten steel. It precipitates in the form of dendrites, which can cut the continuity of the matrix to make turning easy to break chips, and the manganese sulfide has a lubricating effect, which can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251G01N23/2202G01B15/00
CPCG01N23/2251G01N23/2202G01B15/00
Inventor 严春莲鞠新华孟杨佟倩王萍杨瑞
Owner SHOUGANG CORPORATION
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