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含铌钢铸坯的冶炼与连铸

世界钢铁 2010年第2期10卷 17-22页

作者： steven g jansto 王厚昕 CBMMRMC公司

为满足客户日益增加的需求和期望,高强度钢的产品质量也在不断地提高。几乎所有的用户都逐步提高了对钢中残余元素的要求,同时还希望钢材的力学性能更加稳定、纯净度更高,以及表面和内部质量进一步改善。为了高效、低成本生产高强度高... 详细信息

为满足客户日益增加的需求和期望,高强度钢的产品质量也在不断地提高。几乎所有的用户都逐步提高了对钢中残余元素的要求,同时还希望钢材的力学性能更加稳定、纯净度更高,以及表面和内部质量进一步改善。为了高效、低成本生产高强度高品质的汽车用钢、管线钢和结构钢,钢厂必须严格规范好炼钢、钢包精炼和连铸等工艺操作,以在当今竞争激烈的全球钢铁市场中保持竞争力。介绍了目前很多钢铁企业生产高质量含铌钢方坯、板坯及异形坯时在炼钢和连铸操作中所运用的一些要点和建议,这些做法也可以提高普通碳锰钢的产品质量。

关键词：连铸纯净钢热塑性熔炼铌

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铌在高强度抗震钢筋生产中的应用

铌在高强度抗震钢筋生产中的应用

2009全国建筑钢筋生产、设计与应用技术交流研讨会

作者： steven g.jansto 王厚昕 Reference Metals Company-CBMM 中信微合金化技术中心

可焊钢筋是重要的钢材产品之一,被广泛应用于民用建筑中。含铌钢筋的强度水平可以达到345、390以及490的级别水平。尽管传统工艺上,多用V来生产更高强度的钢筋,但是采用可选的加速冷却工艺与加铌相配合的工艺已成功开发生产出490级别的... 详细信息

可焊钢筋是重要的钢材产品之一,被广泛应用于民用建筑中。含铌钢筋的强度水平可以达到345、390以及490的级别水平。尽管传统工艺上,多用V来生产更高强度的钢筋,但是采用可选的加速冷却工艺与加铌相配合的工艺已成功开发生产出490级别的钢筋。从熔炼到无裂纹连铸再到热轧及加速冷却等整个工艺操作中,将铌的作用进行有机结合是成功生产这些高强度钢筋的关键。目前,正在研究开发具有良好韧性和延伸性能的S500和S600系的高强钢筋。为满足抗震和抗台风的要求,无论采用添加何种微合金,生产合格高质量的S500和S600系高强钢筋需要对熔炼及轧制工序进行严格控制,才能获得更高强度更高延伸的性能。

关键词：地震铌钢筋焊接性屈强比

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加铌低碳低锰长材工艺和冶金过程

加铌低碳低锰长材工艺和冶金过程

Development of microalloyed steels for high temperature carburizing

2019全国高效连铸应用技术及铸坯质量控制研讨会

作者： steven g.jansto 唐杰民 Research and Development Resources Bowling green

近年来,随着铌微合金化长材产品工艺和物理冶金技术的不断整合进步,已发展成为低成本质量高的低锰钢,满足长材产品最终用户的需求。这种创新的冶金移植是通过市场需求来验证的,在汽车专用棒材质量和建筑用钢应用领域内,这种长材提高了...

近年来,随着铌微合金化长材产品工艺和物理冶金技术的不断整合进步,已发展成为低成本质量高的低锰钢,满足长材产品最终用户的需求。这种创新的冶金移植是通过市场需求来验证的,在汽车专用棒材质量和建筑用钢应用领域内,这种长材提高了钢的延性、鲁棒性和韧性。通过在长材制品中添加微量铌和降低锰(Mn)含量细化微观结构晶粒尺寸,更好地适

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Baosteel Technical Research 2010年第S1期4卷 86-页

作者： David K MATLOCK John g SPEER steven g jansto Marcos STUART Advanced Steel Processing and Products Research Center Colorado School of Mines GoldenColorado USA CBMM-Reference Metals Bridgeville PA CBMM Sao Paulo Brasil

The potential for use of microalloy additions to suppress abnormal austenite grain growth and produce steels with enhanced bending fatigue resistance after high temperature vacuum carburizing was investigated in a series of Ti-modified SAE 8620 steels with w(niobium) additions up to 0.1%.Results are considered from a series of papers at the Advanced Steel Processing and Products Research Center on the effects of Nb content,heating rate, rolling history,and processing temperature on the evolution of austenite grain structures in carburizing steels. Emphasis is placed on understanding the effects of alloying and processing on each stage in the annealing process including the as received laboratory rolled conditions,during the onset of carburizing after annealing at different heating rates,and after annealing for various times at carburizing temperatures up to 1 100℃.Heating rate to the carburizing temperature was shown to be an influential variable and suppression of abnormal grain growth was dependent on the development of a critical distribution of fine NbC precipitates,stable at the austenitizing *** importance to industrial carburizing practice of heating rate effects on precipitates and austenite grain size evolution are discussed and correlated to selected data on fatigue performance.

关键词： heat treating microalloying carburizing niobium abnormal grain growth

High Strength Low Alloy (HSLA) Steels in Building Construction

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Journal of Iron and Steel Research International 2011年第S1期18卷 773-778页

作者： Sivakumaran Ken Siva jansto steven g Department of Civil Engineering McMaster UniversityHamilton Reference Metals Company-CBMM 1000 Old Pond RoadBridgevillePA 15017USA

Majority of the buildings,including industrial buildings,are constructed using either structural steel (plates and structural shapes) or deformed bar steel reinforced *** buildings,however,must be designed to be safe and serviceable during construction and during use and *** objectives can be easily achieved by the use of steels having superior mechanical properties,ductility,weldability,fire resistance,*** the years,the steel industry has made improvements in steel making technologies resulting in high strength low alloy (HSLA) steels with superior steel properties well suited for building *** part of this paper presents the structural design considerations,and the constructional considerations associated with the building structures in general,and steel structures in *** second part of the paper looks at the acceptance criteria for HSLA steels for North American building codes and *** third part of the paper presents the structural properties of currently available HSLA steels for building *** discussion focuses on hot-rolled structural steel shapes as well as deformed steel bars for concrete *** paper argues that Niobium microalloying is the key to achieving superior properties in such steels.

关键词： HSLA steels building construction structural shapes deformed bars structural performance niobium

21^(st) Century Niobium-Bearing Structural Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 803-807页

作者： jansto steven CBMM-Reference Metals Company 1000 Old Pond Road Bridgeville PA USA

Value-added applications of niobium (Nb) microalloyed steels continue to be developed for commercial implementation to meet increased material demands and improved properties for 21st century structural applications. These applications demand Nb-bearing steels that deliver improved toughness, fracture and fire resistance and weldability. Such applications include medium and jumbo beam, boiler, bridge, container, heavy equipment, long product, pressure vessel, ship, storage tank and windtower applications. Steel producers are challenged to develop microalloyed steel grades that cost effectively meet end user demands for higher strength at thinner cross sections, better low temperature toughness to resist brittle fracture in building, pressure vessel and ship structures, sustain higher loads per unit area in earthquake and hurricane zone product applications, demonstrate improved fire-resistance in buildings, bridges and tunnels and provide overall improved weldability. Niobium is often a key element to achieve these results. This paper will discuss Nb market opportunities and key operational practices required to successfully melt, cast and roll these high strength steel grades. Niobium process metallurgy is important to leverage the ability of niobium to obtain ultra-fine grain, homogeneous structural steel microstructures with superior mechanical properties. The process metallurgy, physical metallurgy and resultant properties are significantly determined by mill capabilities, mill practices, operational understanding and the culture of the steel mill. The optimal combination and implementation aspects that are unique to each mill we call metallurgical operational integration (MOI) . MOI is the bridge that links the product requirements to mill capability and process implementation.

关键词： Century Niobium-Bearing Structural Steels st

The Contribution of Niobium Bearing Steels and Enhanced Sustainability

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Journal of Iron and Steel Research International 2011年第S1期18卷 966-970页

作者： jansto steven CBMM-Reference Metals Company 1000 Old Pond RoadBridgevillePAUSA

With the growing concern for the environmental impact of greenhouse gases and the rapid depletion of important resources,the use of Nb-bearing steels for advanced high strength steel applications can reduce raw material usage and the carbon *** conservation and more efficient use of ironmaking and steelmaking raw materials is an urgent issue for steel producers ***-developed Nb-microalloyed steel applications provide a more effective product design and reduce CO 2 emissions and energy consumption per tonne of steel.A sustainability structural steelstudy presents the positive cost and reduced environmental impact of Nb-microalloyed *** analysis compares the CO 2 emission reduction and energy savings in the steelmaking process melted in both the Basic Oxygen Furnace (BOF) and the Electric Arc Furnace (EAF).Nb-microalloyed structural steels offer the opportunity to reduce the total weight of a given structure compared to a non-microalloyed steel ***,one considers the savings associated with less material and lower construction *** addition,there is an environmental benefit in the reduction in emissions (kilograms of CO 2) and less energy consumption (gJ) due to the fact that less steel is ***,there are lighter sections and less material weight in the final end user design which reduces transportation and fabrication costs.A forecasted trend is presented which introduces an increased usage of microalloyed steel grades to replace traditional commodity-type non-alloyed higher carbon-manganese grades for environmental benefits and significant cost reduction.

关键词： In HSLA The Contribution of Niobium Bearing Steels and Enhanced Sustainability

Oligodendroglial heterogeneity in health,disease,and recovery:deeper insights into myelin dynamics

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Neural Regeneration Research 2025年第11期20卷 3179-3192页

作者： Pieter-Jan Serneels Julie D.De Schutter Lies De groef Lieve Moons steven Bergmans KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionNeural Circuit Development&Regeneration Research GroupLeuvenBelgium KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionCellular Communication&Neurodegeneration Research GroupLeuvenBelgium

Decades of research asserted that the oligodendroglial lineage comprises two cell types:oligodendrocyte precursor cells and ***,recent studies employing single-cell RNA sequencing techniques have uncovered novel cell states,prompting a revision of the existing *** forward,the oligodendroglial lineage should be delineated into five distinct cell states:oligodendrocyte precursor cells,committed oligodendrocyte precursor cells,newly formed oligodendrocytes,myelin-forming oligodendrocytes,and mature *** new classification system enables a deeper understanding of the oligodendroglia in both physiological and pathological *** this uniform terminology will facilitate comparison and integration of data across ***,including the consolidation of findings from various demyelinating models,is essential to better understand the pathogenesis of demyelinating ***,comparing injury models across species with varying regenerative capacities can provide insights that may lead to new therapeutic strategies to overcome remyelination ***,by standardizing terminology and synthesizing data from diverse studies across different animal models,we can enhance our understanding of myelin pathology in central nervous system disorders such as multiple sclerosis,Alzheimer's disease,and amyotrophic lateral sclerosis,all of which involve oligodendroglial and myelin dysfunction.

关键词： animal models demyelination fish mammals multiple sclerosis myelin neurodegeneration oligodendrocytes oligodendroglial lineage remyelination

Hot Ductility Behavior and Slab Crack Performance of Microalloyed Steels During Continuous Casting

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Hot Ductility Behavior and Slab Crack Performance of Microal...