Sample preparation method of oxygen content measurement of steels

Abstract

The invention relates to a sample preparation method of the oxygen content measurement of steels, which comprises sample preparation methods of pipes, sheets and high-hardness steels and can satisfy the requirements on the oxygen content measurement on the steels in a bearing manufacturing enterprise according the technical requirements of products. Especially for thin-wall pipes, thin sheets, high-hardness steels, and other steels, samples can not be manufactured according to rules in a standard, therefore, the oxygen content of steels at key parts of a bearing can not be measured; and the samples can be manufactured by adopting the sample preparation method in the invention, and the oxygen content can also be measured according to procedures, devices, and methods in an GB / T11261-2006 standard. The samples manufactured by using the sample preparation method can not only be used for measuring the steels, but also be used for measuring the oxygen contents of other metals, thereby overcoming limitations of the sample preparation method in the standard, broadening the usable range and ensuring that more steel products can be all subjected to the oxygen content measurement by using the standard method; and the sample preparation method provides reliable basis and guarantees especially for analyzing and searching early failure reasons of bearing products.

Description

technical field [0001] The invention relates to a sample preparation method, in particular to a sample preparation method for measuring the oxygen content of steel materials, and at the same time, the method is also suitable for sample preparation when other metal materials are used for oxygen content measurement. Background technique [0002] With the rapid development of industry, the demand for high-precision and long-life bearings is increasing, especially for generator bearings, chassis bearings and four-point angular contact bearings used in automobiles. Materials put forward higher requirements. The oxygen content of bearing steel is an important indicator to measure the quality of bearing steel, because the distribution of oxygen content of non-metallic inclusions has a great influence on the life of bearing steel. The higher the amount of inclusions, the shorter the life. The inclusion of objects is an important reason affecting the fatigue life of bearing steel. T...

AI Technical Summary

Problems solved by technology

[0006] However, in actual production, the steel used by bearing manufacturers to make the outer and inner rings of bearings generally uses thin-walled pipe materials, especially for micro-sized deep groove ball bearings, whose wall thickness is only 1.5mm, and it is even more difficult to comply with GB / T11261-2006 standard method for sample preparation, that is, these steels cannot measure the oxygen content

[0007] In addition, some bearings that have been used in the factory should not fail according to the routine, but sometimes they fail early, especially for high-end bearing products. At this time, it is necessary to conduct a failure analysis of the product to find the cause. For analysis, it is necessary to measure the oxygen content of the steel material. Therefore, it is impossible to measure the oxygen content of the heat-treated high-hardness metal material if the method in the national standard is used for sample preparation.