Development of Technological Methods of Additional Grain Refinement for Production of Cold Resistant Nb-Bearing Plate Steel with SMYS 450-485 MPA and Thickness Up to 40 MM

Matrosov, M. Yu.; Golovin, S. V.; Ringinen, D. A.; Ilynsky, V.I.; Nastich, S. Yu.; Kichkina, A. A.; Lyasotsky, I.V.

doi:10.1002/9781119223399.ch139

Cited by 2 publications

(5 citation statements)

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“…Results of several studies confirmed the importance of proper furnace control in industrial trial production of 40-mm plates with specified minimum yield strength (SMYS) of 450 MPa at the 5-m hot rolling mill of Vyksa Steel Works in Russia [22]. The chemical composition of the steel was 0.06% C, 0.20% Si, 1.6% Mn, 0.03% Nb, 0.016% Ti, and additions of Ni, Cu, Cr (Mo).…”

Section: Figurementioning

confidence: 76%

“…Impact toughness (Kv at −20 • C) and drop-weight tear tests (DWTT) were measured in order to evaluate cold resistance toughness behavior from the industrial trial. [22]. Figure 12 shows the time parameter effect at a low reheat temperature of 1170 • C and the associated deterioration in toughness for slabs held over 500 min.…”

Section: Figurementioning

confidence: 99%

“…Also, greater than 500 min heating time generally exhibits lower average toughness when compared to the less than 500 min heating time. hot rolling mill of Vyksa Steel Works in Russia [22]. The chemical composition of the steel was 0.06% C, 0.20% Si, 1.6% Mn, 0.03% Nb, 0.016% Ti, and additions of Ni, Cu, Cr (Mo).…”

Section: Figurementioning

confidence: 99%

“…The percent drop weight tear test (DWTT) is the ultimate measure of the success or not in the final rolled plate product toughness and ductile shear behavior. The influence of reheating temperatures on %DWTT is illustrated in Figure 13 [22].…”

Section: Figurementioning

confidence: 99%

“…Shear area of drop-weight tear tests (DWTT) versus DWTT test temperature (reproduced from[22], with permission from The Minerals, Metals &Materials Society, 2015).…”

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confidence: 99%

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The Integration of Process and Product Metallurgy in Niobium Bearing Steels

Jansto¹

2018

Metals

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A review of the technological integration of both the process and physical metallurgical advancements of value-added niobium (Nb) microalloyed thermo-mechanical controlled process (TMCP) steels have evolved into the development of higher quality steels for more demanding end user requirements. The connection of process and physical metallurgy is evolving through the integration of research that is aimed at improving product quality. However, often the connection of the process metallurgical parameters is not reported, especially with industrial data. The importance of this innovative metallurgical connection is validated by the market demand for reduced fuel consumption, improved quality, and CO2 emissions in both the automotive and construction sectors. This situation has further increased the demand for new higher quality Nb-bearing steel grades. This integrative process/physical metallurgical (IP/PM) approach applies to both low and high strength steel grades in numerous applications. Often, the transition from laboratory melted and TMCP to the production scale is challenging. The methodology, process control, and key production steps that are required during the melting, ladle metallurgy, continuous casting, thermal, and hot rolling production conditions often vary significantly from the laboratory conditions. Understanding the reasons and corrective action for these variations is a critical product development success factor. These process metallurgy parameters for the industrial melting, casting, reheating, and hot rolling of Nb grades are connected and correlated to the resultant microstructures, physical metallurgy, and mechanical properties. These advanced high strength steels are microalloyed with Nb, V, Ti and/or other elements, which affect the austenite-ferrite transformation. Niobium enables the achievement of substantial grain refinement when the plate or sheet is rolled with the proper reheat, hot reduction, and thermal schedule. A recently developed key metallurgical transition is in progress applying this integrative approach with the use of MicroNiobium. A reduction of Mn and C levels with the complementary refinement of the microstructural grain size through MicroNiobium additions improves the robustness of the steel to better accommodate some process metallurgy variations. Applications are evolving in lower strength steels with Nb to achieve complementary grain refinement.

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Section: Figurementioning

confidence: 76%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“…Shear area of drop-weight tear tests (DWTT) versus DWTT test temperature (reproduced from[22], with permission from The Minerals, Metals &Materials Society, 2015).…”

mentioning

confidence: 99%

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The Integration of Process and Product Metallurgy in Niobium Bearing Steels

Jansto¹

2018

Metals

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Reheat Furnace Thermodynamic, Kinetic and Combustion Considerations for TMCP Processing

Jansto¹

2018

MSF

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The reheat furnace process step has a profound effect on the TMCP performance, final hot rolled steel quality and mechanical property consistency during the production of hot rolled steels. The uniformity of heating applied across the entire width and length of the slab or billet is critical in the achievement of customer properties regardless of the chemistry. The resultant ferrite grain size in the final hot rolled product is significantly governed by the initial prior austenite grain size. Numerous reheat furnace process metallurgy and combustion parameters in actual operation affect mill productivity, microstructure, austenite grain size, scrap rate and diverts. This reheating step in the steelmaking process often receives low priority in the evaluation of product quality and mechanical property performance, especially the toughness through the plate thickness. Heat transfer conditions of radiation, convection and conduction affect furnace heating efficiency. In laboratory studies, the furnace heating step is typically quite uniform resulting in a homogeneous and fine prior austenite grain size. During production, it is much more difficult to control the uniformity of heating and heat transfer consistency along the entire length and through the thickness of the work piece. The furnace conditions are correlated to product quality via furnace process variables such as the air to gas ratio, furnace burner condition, furnace pressure, energy efficiency, adiabatic flame temperature (AFT) and furnace refractory condition. Operational practice recommendations are presented to minimize inhomogeneous heating which results in inferior product quality, hot rolling model anomalies and toughness variations in the through-thickness-direction.

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Development of Technological Methods of Additional Grain Refinement for Production of Cold Resistant Nb-Bearing Plate Steel with SMYS 450-485 MPA and Thickness Up to 40 MM

Cited by 2 publications

References 6 publications

The Integration of Process and Product Metallurgy in Niobium Bearing Steels

The Integration of Process and Product Metallurgy in Niobium Bearing Steels

Reheat Furnace Thermodynamic, Kinetic and Combustion Considerations for TMCP Processing

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