Study of the Effect of Microalloying on Microstructure and Mechanical Property Formation for Rolled Product of Strength Class K52 Produced Under CRU Conditions

Naumenko, V. V.; Bagmet, O. A.; Matrosov, M. Yu.; Muntin, A. V.; Солдатов, Е. А.; Kichkina, A. A.

doi:10.1007/s11015-020-01052-2

Cited by 3 publications

(3 citation statements)

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“…Recently, microalloying technology has been extensively studied to improve the cleanliness and ameliorate the microstructure characteristics of steels. [36][37][38][39][40] Mineura et al [41] reported that calcium treatment could effectively reduce the O and S contents in HNSS, while calcium treatment is not suitable for the production of bearing steel to prevent the fatigue fracture of bearing caused by calcium aluminate inclusions. Moreover, Li et al [42,43] reported that magnesium treatment could reduce the quantity of large-size inclusions, and dissolved Mg could promote the heterogeneous nucleation of carbides in H13 steel, thereby inhibiting the chain growth of carbides.…”

Section: Introductionmentioning

confidence: 99%

Cerium Addition Improves Cleanliness and Refines Microstructure of As‐Cast High‐Nitrogen Stainless Bearing Steel

Lu,

Feng,

et al. 2023

steel research int.

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High‐nitrogen stainless bearing steel (HNSBS) is the most representative third‐generation aviation bearing steel, and the cleanliness and microstructure characteristics of bearing steel are crucial to its high performance and long service life. In this work, the effect of cerium addition on the cleanliness and microstructure characteristics of as‐cast HNSBS was systematically studied by combining microstructural characterization and thermodynamic analysis methods. The results show that with increasing Ce content, the cleanliness of steel first improved and then decreased, and Ce2O2S, Ce2O3 and CeN inclusions were generated successively. The Ce content should be controlled to ≈0.012 wt% to ensure that all Al2O3, MgO · Al2O3, and MnS inclusions were modified, and minimize the formation of large‐size Ce‐bearing inclusions. Furthermore, cerium addition refined the dendrite structure due to more nucleation sites for γ‐Fe and the enrichment of Ce in the liquid phase at solidifying front. The finer and more dispersed distribution in precipitates was ascribed to the reduction of growth space and Cr segregation, as well as the increase in effective nucleation sites. These results can offer theoretical guidance for inhibiting the formation of harmful inclusions in high‐nitrogen alloy systems and refining the microstructure of alloy systems containing M23(C, N)6 and M2(C, N) precipitates.

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Section: Introductionmentioning

confidence: 99%

Cerium Addition Improves Cleanliness and Refines Microstructure of As‐Cast High‐Nitrogen Stainless Bearing Steel

Lu,

Feng,

et al. 2023

steel research int.

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“…Steels with rather high carbon content are used for casing pipes and tubings (in comparison with gas and oil line pipes), what is explained by high requirements to their strength parameters as well as necessity to obtain rather low V т /V в relationship. It is very important to provide small axial segregation and high steel cleanness for non-metallic inclusions in manufacture of rolled products for casing pipes and tubings [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Development of rolling procedures for pipes of K55 strength class at the laboratorial mill

Adigamov¹,

Baraboshkin²,

Mishnev³

et al. 2022

cisisr

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Experimental results of physical simulation of the manufacturing technology of coiled rolled strip for pipes of K55 strength class (API SCT) at the laboratorial mill are presented. This manufacturing process includes hot rolling with accelerated cooling and coiling at high temperature. Melting of 4 laboratorial melts of K55 steel was conducted. Mechanical properties of pilot strips were examined. Investigation of microstructure via the methods of optical and scanning electronic microscopy was conducted. All samples have ferrite-pearlite microstructure which corresponded to the aimed microstructure. It was noted that molten metal without vanadium is more susceptible to forming of undesirable products of intermediate transformation stage. Recommendations on chemical composition and manufacturing technology of K55 steel on 2000 rolling mill are developed. Steel has the following aimed chemical composition for the main elements: 0.32 % C; 0.5 % Si; 1.05 % Mn; 0.05 % V. The following main technological parameters were recommended: heating up to 1240-1260 ºC; temperature after 5 th stand 1060-1100 ºC; thickness of rolled semiproduct 30-40 mm; temperature before 6 th stand 950-970 ºC; finishing rolling temperature 830-870 ºC; temperature in the 1 st coiling group 650-680 ºC; coiling temperature 620-640 ºC.

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“…Это можно объяснить тем, что процесс ПХП достаточно сложный, многоступенчатый, зависящий от большого числа производственных (рис. 1), и выявить действительно значимые факторы, оказывающие влияние на возникновение коррозии, снижая тем самым количество бракованных единиц продукции, опытным путем не представляется возможным [3][4][5][6]. В самой общей формулировке задача исследования заключалась в том, чтобы выявить именно те производственные факторы, которые оказывают значимое влияние на количество брака, и провести анализ зависимостей количества брака от этих факторов, т. е., выражаясь математическим языком, построить уравнение регрессии количества брака по причине коррозии на значимые производственные факторы.…”

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Construction of a Mathematical Model of the Corrosion Defect on Cold-Rolled Steel Depending on the Production Factors

PARYGINA

2022

Černaâ metallurgiâ. Bûlletenʹ naučno-tehničeskoj informacii

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Significant economic losses from metal corrosion force metal manufacturers to look for ways to reduce these losses including using the machine learning methods. A regression mathematical model has been built that allows regulating the influence of the initial factors in the production of cold-rolled steel in order to reduce such a common defect as metal corrosion. We have identified 10 significant production factors and selected the equation of linear multiple regression of these factors for the output variable y, which determines the percentage of scrap due to corrosion during production of the cold-rolled steel. The coefficients of the equation of multiple linear regression of 10 production factors for the percentage of scrap and the coefficient of determination were calculated, which assess the quality of the constructed mathematical model. The value of the coefficient of determination equal to 0.96 indicates a high modeling accuracy. The recommendations for the regression equation, e.g. to increase the intermediate storage times, to reduce the pump pressure, to increase the emulsion consumption, etc. allow reduction in the percentage of scrap due to metal corrosion in the production of cold-rolled steel.

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Study of the Effect of Microalloying on Microstructure and Mechanical Property Formation for Rolled Product of Strength Class K52 Produced Under CRU Conditions

Cited by 3 publications

References 1 publication

Cerium Addition Improves Cleanliness and Refines Microstructure of As‐Cast High‐Nitrogen Stainless Bearing Steel

Cerium Addition Improves Cleanliness and Refines Microstructure of As‐Cast High‐Nitrogen Stainless Bearing Steel

Development of rolling procedures for pipes of K55 strength class at the laboratorial mill

Construction of a Mathematical Model of the Corrosion Defect on Cold-Rolled Steel Depending on the Production Factors

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