热轧硅钢冶炼化学成分与电磁性能

结合近年来低硅钢退火的生产实践，在对影响低硅钢电磁性能的各因素进行多方面试验和大量的生产数据统计基础上，阐明了合理控制低硅钢冶炼化学成分是提高磁性能的有效途径，并提出了低硅冶炼化学成分的最佳控制范围。     

热轧硅钢退火工艺参数控制与电磁性能

阐明了合理控制低硅钢退火工艺参数是提高磁性能的有效途径 ,提出了低硅钢退火工艺参数的最佳控制状态。     

70t电弧炉冶炼Q195生产实践

本文通过化学成分设计确定了Q195冶炼的化学成分,通过步料操作控制、熔化期操作控制氧化期操作控制、出钢及预脱氧合金化操作控制和钢包精炼操作控制等工艺,成功冶炼出了符合国标化学成分要求的钢液。结果表明,试验钢液具有较低的氧含量,并且试验过程中的冶炼周期均在合理范围内,后续可以批量生产。     

KHR4N耐热铸钢的冶炼

本文重点阐述了采用返回吹氧法冶炼ＫＨＲ４Ｎ耐热铸钢较常规氧化法可获较高的经济效益；同时，叙述了利用返回氧法冶炼ＫＨＲ４Ｎ耐热铸钢工艺要点，并从理论上分析了脱碳保铬工艺参数确定依据。通过冶炼实践，合理地控制化学成分，保证了产品机械性能以及铸件技术要求。     

高锰无磁钢40Mn18Cr3的冶炼

针对高锰无磁钢40Mn18Cr3的化学成分和力学性能特点,对冶炼工艺进行研究及改进,采取电炉—LF精炼—真空脱气—浇注钢锭的冶炼工艺,并控制真空前湿度和时间,使锰成分和气体含量达到标准要求,保证轧材全部合格。     

90t电弧炉冶炼Q235B生产实践

本文根据国标和生产实际设计了Q235B冶炼的化学成分,采用步料操作控制、熔化期操作控制氧化期操作控制、出钢及预脱氧合金化操作控制和钢包精炼操作控制等工艺操作,成功冶炼出了符合国标化学成分要求的钢液。结果表明,试验生产冶炼周期范围合理,钢液具有较低氧含量,可以实现量产。     

硅钢加热炉炉温控制技术

以宝山钢铁股份有限公司三热轧带钢工程硅钢加热炉项目的炉温控制为例,阐述硅钢炉的燃烧控制技术特点,特别是燃烧控制所采用的带温度前馈功能的改进型双交叉限幅炉温控制、循环间断控制(小流量控制)以及左右代码控制等。     

40Mn2钢回归分析及内控成份制定

针对冶炼用原辅材料残余元素含量偏高,对其力学性能造成一定影响,采用直读光谱进行成份分析,利用回归计算出C、Mn等主要化学成分最佳内控范围。在冶炼应用中减少了冶炼废品损失,取得较好的经济和社会效益。     

360m^3烧结机进料系统衬板的研制

介绍了烧结机进料系统衬板化学成分的合金元素组成,以及其冶炼工艺、铸造工艺和热处理工艺要点。     

高碳盘条中夹杂物的提取与分析

在钢材冶炼过程中,夹杂物会出现于冶炼的各个阶段,并容易造成盘条在拉拔过程中的断丝。本文采用非水溶液电解法提取了高碳盘条中的非金属夹杂物,观察了其三维形貌,并利用扫描电镜和能谱仪分析了夹杂物的几何形态、化学成分及尺寸分布。     

The assessment of ball bearing steels of modified chemical composition

With the development of cleaner ball bearing steels of improved properties and lower inclusion content, carbide content, an inherent feature of these steels, carbide size and carbide segregation have become of importance as large non-deforming carbides can fracture to initiate rolling contact fatigue and premature failure. A lower carbon and chromium type of steel, with increased silicon and manganese contents to provide matrix strengthening and to maintain hardness, offers a means of reducing carbide content and suppressing deleterious structural features such as carbide segregation, carbide stringers and carbide network.Under conditions of accelerated service simulation testing the steels of modified composition compared favourably in rolling contact fatigue resistance with steels of conventional compositions. The increased silicon content may also control deleterious interstitial nitrogen content by forming fine silicon nitride precipitates which were identified in microstructures produced by the optimum heat treatment procedure.     

Scale behavior in erosion-corrosion of low alloy steels

Low alloy steels containing some chromium and other alloying elements with regular silicon content, together with the same chromium content steels containing extra silicon, were tested at the velocities and temperatures which can occur in atmospheric fluidized-bed combustors. It was determined that the particular characteristics of the scale formed on the alloys contributed to the metal wastage that occurred. The low chromium content steels which contained extra silicon (1.4–1.5 wt.%) had markedly lower metal loss than regular silicon content steels had, even lower than that of higher chromium content, regular silicon content steels. The role of the extra silicon that increases the erosion-corrosion resistance of the steels is under investigation.     

Effect of doping elements on electromagnetic properties of iron and low-carbon steel

Using eddy-current and other methods, electromagnetic properties of iron doped with small quantities of carbide-forming elements (W, V, and Ti), alongside the properties of low-carbon steels, have been studied. The effect of the carbon content in the alloys on their electromagnetic properties has been analyzed.     

The effect of additional silicon on the corrosion and erosion-corrosion of low chromium steels

The addition of 1wt.%Si to commercial steel containing 2.5wt.%Cr significantly lowered its erosion-corrosion metal wastage rate at 650 °C. The improved erosion resistance was largely a result of a modified corrosion behavior. Static oxidation studies showed that the normal silicon content 2.5Cr steel developed a duplex, spalling prone, iron-rich scale at 650 °C. However, with the addition of silicon, the scale was almost 50 times thinner, and was chromium-rich instead. Metal wastage was significantly reduced for static and dynamic corrosion as well as for erosion-corrosion. The thin scale that formed on the additional silicon steels cracked and chipped off at a low metal loss rate compared with the thick scale that formed on the normal silicon steels that spalled off at a higher metal loss rate.     

粘结Fe＋SiC磁性磨料的研究

研究了粘结Fe SiC磁性磨料的成分、粒度以及研磨时间对几种钢件研磨表面粗糙度的影响,并通过扫描电镜分析研磨表面形貌,探讨了研磨机理。试验结果表明：该磁性磨料具有良好的研磨效果,而磨磨机理是SiC粒子对钢件表面的低应力磨料磨削。     

Improvement of the triboengineering and physicochemical properties of Puma lubricating compositions with lithium molybdophosphate additive

The paper deals with the results of investigation of the physicochemical and triboengineering properties of Puma lubricating compositions used to grease rails and flanges and the same composition modified by the authors with inorganic molybdophosphate additive. The influence of the Puma lubricating compositions with the lithium molybdophosphate additive on the wear of wheel and rail steels is studied, as well as the likely mechanism of action of inorganic phosphorus-containing additives of the polymeric nature. The present paper continues a series of studies of the application of inorganic polymeric phosphates as multifunctional additives to plastic railway greases.     

汽车用低合金高强度钢成分及控冷工艺

对铌、钛微合金化低碳锰系汽车用低合金高强度钢的成分、控冷工艺对其组织与力学性能的影响进行了试验研究。结果表明：卷取温度降低，钢的强度上升，伸长率下降，组织由铁素体＋珠光体向贝氏体、马氏体转变；高温卷取时铌、钒对强度的贡献较明显，低温卷取时碳的贡献较大；对含0．06％～0．11％碳的锰锟一钛系低合金高强度钢，同一成分采用不同的控冷工艺可以达到S550MC与S700MC两个级别的性能要求。     

Strengthening mechanisms in high strength structural steels*

The factors controlling the strength and impact properties of predominantly ferritic structural steels including solid-solution strengthening, ferrite-grain size and precipitation strengthening, have been discussed. It has been shown how individual factors can be combined to give strong-tough structural steels. Examples of commercial and experimental steels with high strength and good impact properties have been given.     

Influence of the sintering agglomeration regime on the magnetic properties and hardness of specimens made of powder steels 30NM and 30N2M

The dependences of the magnetic properties and hardness of powder-sintered steels 30NM and 30N2M with different densities on the sintering temperature are studied. It is shown that, for specimens with the studied compositions, there is a correlation between the combined parameter produced by the coercive force and saturation magnetization and the steel tempering temperature and hardness.     

Mechanical behavior of erosion-corrosion scales on steels as characterized by single-particle impacts

Samples of 2.25Cr-1Mo (less than 0.5 Si) and 2.5Cr-0.55Mo-1.4Si steels were eroded-corroded at 450 and 650 °C using fluidized bed combustor bed particles at velocities of 10 and 20 m s⁻¹. The steel with higher silicon content showed significantly lower metal loss rates under all conditions.

The samples were subsequently subjected to single-particle impacts using spherical WC particles at velocities around 50 m s⁻. The impact response of the scales could be explained in terms of a combination of substrate hardness and scale morphology effects but could not be consistently related to the superior erosion-corrosion resistance of the steel with higher silicon content. All scales were composed of oxidation product and deposited bed material erodent. Samples eroded-corroded at 450 °C had denser, more mechanically stable scales which could be associated with the generally lower erosion-corrosion rates at this temperature. At 650 °C the scales were more loosely packed, especially at the lower erosion-corrosion velocity, which resulted in apparent ductility by permitting them to densify under impact. Scales were either segmented or continuous in appearance. Thick continuous scales maintained their integrity under the lower velocity conditions of the erosion-corrosion tests, thus leading to low metal losses, but spalled catastrophicaliy under the single impacts. Segmented scales spalled in smaller pieces under single impacts. It is proposed that the segmented scales would exhibit significant failure under low velocity conditions, thus providing less protection to the steels than continuous scales under similar conditions.