Authors: A.N. Korotkov, L.P. Korotkova, D.V. Vidin, S.V. Lashinina, O.V. Frolova

Title of the article: Quality control of structural steels in the production of mining equipment in the machine-building enterprises of Kuzbass

Year: 2016, Issue: 1, Pages: 119-128

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.002:658.562(571.17)

DOI: -

Abstract: High requirements to the mining equipment are made to the reliability and durability, that ensures its trouble-free operation. Technical quality control of steels and alloys in the machine-building enterprises is an important part of the production quality products, which meet the technical requirements. The urgency problem of the quality control materials increases due to the planned expansion of the production mining equipment at the enterprises of Kuzbass. The authors have accumulated a practical experience in the quality control of construction materials used in mining machine-building. The problem of non-compliance of quality structural steels, supplied in the machine-building enterprises of the region, the established standards, was studied. The authors have developed a methodology of the quality control steels at the delivery and at all basic technological stages of production of the components in accordance with established national standards. Using this methodology allowed us to study a significant problem of quality metal at delivery. As a result of the integrated quality control of steels at delivery were identified: the deviation of the chemical composition in the alloys; macro defects – segregation, porosity, shrinkage holes, cracks, etc.; microstructure defects – large grain, pores, the presence of non-metallic inclusions, rests of carbide grid (net), etc.; deviations in hardness. All these discrepancies indicate a low quality of delivered products. The quality control in the production of steel parts was made fully and included the steps of blank production, of preliminary and hardening heat treatments. The problem of providing performance pieces was solved by correction the preliminary heat treatment in order to eliminate the detected defects of the microstructure in the condition delivery. We have investigated the hardening heat treatment, and, if necessary, developed recommendations for its correction in order to ensure the required operational properties of pieces. In general, the result of a comprehensive of quality control steel as delivered and at different technological stages of production, was able to identify systemic problems related to the quality of steels, heat treatment. As a result, we have proposed concrete actions to resolve them. All this helps to improve the reliability and durability of the parts and components of mining equipment.

Key words: structural steels quality operating properties microstructure macro analysis nonmetallic inclusions grain size mechanical properties heat treatment structural banding hot-rolled defects in the microstructure mining equipment

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