碳化铬硬质合金玻璃成形模

介绍了采用碳化铬硬质合金制作质谱计和表面分析仪器中的双曲面玻璃管的成形模具。该模具在室温至800℃范围内反复加热成形,变形甚微,保证了玻璃制品几何尺寸的高精度要求,该合金具有极高的抗氧化性能,不与玻璃粘结,易脱模。模具使用寿命较常用模具材料1Cr18Ni9Ti高10倍以上。因此,碳化铬硬质合金是制作电真空玻璃制品的理想模具材料。还介绍了碳化铬硬质合金的制备工艺和性能。     

模具钢材料对压铸模寿命的影响

压铸模广泛用于铜、铝、锌等有色金属高温压铸成型的模具，其模具型腔复杂并存在多种受力形态，对模具材料的要求也很高，本文通过分析了压铸模失效的实质以及模具钢材料的行为与压铸模寿命的连带关系，从而提出了对模具钢材料的性能要求以达到改善压铸模作为有色金属压力锻造模具在使用时的寿命。     

有限元在注塑模具磁场模拟方面的应用与探讨

运用有限元分析软件,通过建立几何模型,确定模具所用材料,模具磁铁相关参数,对注塑铁氧体模具中的永磁结构进行磁场模拟,从而得到磁路模拟波形图,并对不同设计结构进行比较,从而选出最优设计方案,准确实现产品性能,节约模具开发时间以及设计成本.     

SiCp/Fe复合材料电流烧结工艺及性能研究

研究了一种电流加热动态热压烧结工艺,并研制了相应的设备.采用此工艺对颗粒增强铁基复合材料进行了制备研究.比较了普通粉末冶金和此工艺所制备的SiCp/Fe复合材料的性能以及此工艺中模具的不同对材料性能的影响,结合显微组织观察对此工艺的烧结机理进行了讨论.结果表明:采用陶瓷模具进行电流动态热压烧结,对材料性能提高显著,能在短时间内制备出满足实际应用要求的铁基复合材料,材料组织细小均匀.     

RW40钢结硬质合金热挤压模具材料的研制

本文介绍了RW40钢结硬质合金热挤压模具材料的组成范围、制取工艺及物理机械性能;讨论了淬火、回火温度对合金组织和性能的影响。使用结果表明,该材料用作铝合金异形型材热挤压模具的寿命比传统的热作模具钢3Cr2W8V提高多倍,效果良好。     

技术研发中心成功开发出H13热作模具钢

H13热作模具钢为美国牌号，主要用于制作较高温度下的模具材料，具有优良的综合力学性能，良好的抗热疲劳性能、热稳定性、抗氧化和耐液态金属冲蚀性能，以及良好的淬透性，是制造热作模的首选材料。国内模具钢主要生产厂家为长城特钢、辽特集团、上钢五厂，这三家钢厂的热作模具钢产量占到全国热作模具钢产量的50％。H13模具钢自今年以来，市场价格大幅上扬，为进一步拓宽莱钢产品市场，     

国内热作模具材料发展现状

本文简要介绍了国内热作模具材料的市场现状和现有主要热作模具材料类型,分析了国内热作模具材料所存在问题,并结合国外先进水平指出国内热作模具材料的发展趋势.     

新型热作模具钢Y10的试制

我国原用的热作模具钢以3Cr_2W_8V为代表,该钢的综合性能不高,尤其冷热疲劳性能较差,影响着模具的使用寿命。通过对现有世界较先进国家的模具材料资料的分析并根据热作模具钢对性能所要求的特点,我们和上海材料研究所共同设计试制成功一种新型热作模具钢Y_(10),性能优于3Cr_2W_8V和H_(13)钢,现将试验研究总结如下。     

金属冲压模具材料的新动向

冲压模具的应用范围非常广,其中包含了汽车、日用五金以及电子行业等等,属于所有模具应用中使用量最大的模具。在冲压模具的设计和制造中具备非常多的知识和技术,而且当前的很多金属冲压模具材料需要通过进口,我国自主研发的材料在数量和应用方面都呈现不足,而且还需要针对当前应用到的技术进行科学分析,结合我国实际现状进行优化,进而满足现代金属冲压模具市场发展的要求。冲压模具材料在市场中有着非常重要的地位,为了保障冲压模具能更加适应当前的市场需要,针对金属冲压模具材料进行分析,提出相应的材料发展新动向。     

稀土元素在ZA27CuMg合金中的作用

介绍了一种超塑成型的新型模具材料──高强稀土锌铝合金的制备和性能。重点介绍了不同稀士含量的锌铝合会的超塑性能，分析了稀土元素在合金中的作用。     

La2O3对TZM合金烧结坯组织与性能的影响

采用粉末冶金法制备TZM-La合金板坯,以Mo粉、TiH2、ZrH2、稀土氧化物La2O3和石墨粉为原料,钢模压制和1 900℃高温烧结。用扫描电镜和能谱分析研究第二相粒子对TZM-La板坯组织性能的影响。结果表明,添加La2O3后,板坯晶粒明显细化,致密度提高,韧性得到显著改善。     

连铸保护渣与氧化铝的交互作用研究现状

保护渣中Al2O3质量分数变化是渣钢交互作用的结果,包括吸附钢液中Al2O3夹杂和渣金反应产物。氧化铝对保护渣成分与性能稳定性影响突出,进而影响铸坯质量。分析指出,影响保护渣吸附Al2O3夹杂的因素包括接触角、润湿速率和界面张力、熔渣成分和性能等。熔渣与夹杂物的交互作用行为决定了其对上浮夹杂的去除率。高铝钢连铸过程渣金反应尤为突出,保护渣的工作性能将发生明显改变。基于近年关于Al2O3夹杂的吸附溶解试验研究,以及高铝钢浇铸渣金反应及其保护渣性能变化的研究结果,探讨了通过合理设计保护渣成分或更换渣系等措施来实现该类钢种保护渣工作性能的相对稳定性。     

Design of mould fluxes for continuous casting of special steels

The melting behaviour of mould powder during continuous casting is an important consideration with respect to caster performance, production rate and steel quality. Two important factors, powder composition and carbon addition, are critical to control the properties and melting behaviour of the mould flux. In this study, the effect of different carbonaceous materials on the melting characteristics of mould powders was evaluated. Correlations were established between the structural factors and chemical reactivity of carbon and melting behaviour of mould flux. In addition, two examples are given of the effect of flux composition on casting performance for specific steels. A flux with reasonable basicity and additives was designed for the casting of heat-resistant steel (Incoloy 800) to reduce surface cracks. Another flux was designed for the casting of non-magnetic steel containing high aluminium by partially replacing SiO₂ with Al₂O₃ to limit aluminium oxidation by SiO₂.     

宽板坯连铸机保护渣性能要求及评价方法

根据低、中、高碳钢以及包晶钢的凝固特性,研究了不同钢种保护渣的性能。针对宽板坯连铸机的工艺特点,分析了宽板坯连铸机对保护渣性能设计的要求。在连铸生产现场,合适的铜板温度、结晶器进回水温差与热通量是最有效的保护渣评价参数,连铸坯表面质量是评价保护渣优劣的最终标准。     

The Influence of Carbonaceous Material on the Melting Behaviour of Mould Powder

The melting behaviour of mould powder during continuous casting is an important consideration with respect to caster performance, production rate and steel quality. In this experimental study the effect of different carbonaceous materials on the melting characteristics of mould powders was evaluated. Using X‐ray diffraction, different types of carbon were quantitatively characterized in terms of their internal structure and reactivity experiments were conducted to investigate potential relationships between the structural morphology of carbons and their reactivity. High temperature microscopy and drip test experiments were then used to investigate the melting behaviour of mould powders containing different carbonaceous materials. From the results obtained, correlations were established between the structural factors, chemical reactivity and melting behaviour.     

Mould Powder Development for Continuous Casting of Steel

Mould powders significantly determine the stability of the continuous casting process of steel at all casting speeds. The main functions of mould powders are to provide strand lubrication and to control the mould heat transfer in the horizontal direction between the steel shell and the copper mould. The composition, properties and operational performance of mould powders were investigated in detail with a focus on high-speed thin slab casting and conventional slab casting. Various advanced characterisation methods were applied, completed with experiments at laboratory scale and full-scale plant trials. It was found that melting of mould powder at the meniscus and crystallisation of the slag film are key processes during continuous casting. Both powder melting and slag crystallisation are primarily based on the composition of the mould powder and the mould slag. Additionally, the operational parameters during continuous casting will affect these processes as well. Results of the work are used for a further and more fundamental understanding of the mould powder functions and to guide mould powder design for various steel grades.     

结晶器保护渣性能和使用工艺

对结晶器保护渣的性能作了描述；对结晶器保护渣的性能与工艺条件、钢种的优化匹配进行了探讨。     

Continuous casting mould powder evaluation

Abstract

A continuous casting mould powder must satisfy various requirements including thermal insulation, chemical insulation, inclusion absorption, lubrication, and promotion of uniform heat transfer from the solidifying steel strand to the copper mould. The relative importance of these properties varies according to the type of steel cast, the prevailing casting conditions, and the end steel requirements. Development of mould powders at Corus UK Ltd involves plant based trials of different powders whose properties influence the above characteristics of which heat transfer is a major consideration. Particular use is made of mould thermal monitoring which, although primarily designed for sticker breakout detection, is now finding increasing use as an investigative tool in mould slag assessment. Both static and dynamic plant data are now available relating mould slag heat transfer performance to casting conditions and this paper describes some recent investigative work carried out by the Aluminium & Steel Casting Department of Teesside Technology Centre, Corus UK Ltd. The study shows that using a combination of plant based observation and laboratory analysis, a greater depth in understanding of mould powder performance can be realised, yielding important information for future powder development.     

烧结机耐磨刮刀头的设计与应用

介绍了安钢烧结厂烧结机机尾卸料刮刀头由普通轻轨改为高铬稀土耐热耐磨合金钢，延长刮刀头的使用寿命的设计方法和使用效果。     

X80管线钢的生产实践

采用窄成分范围控制,根据规格性能要求,调整微合金元素加入量,降低X80管线钢的原料成本。改进保护浇注效果,恒拉速浇注,使用动态轻压下和大倒角结晶器,提高连铸坯表面和内部质量,提高连浇炉数,降低X80管线钢的生产成本。采用热送热装技术,降低能源消耗,提高生产节奏,实现X80管线钢高效低成本生产。