试论建筑钢材采购价格组成与采购成本控制

本文主要针对建筑钢材采购价格组成与采购成本控制展开深入研究,先阐述了建筑材料的定价模式,然后详细分析钢材采购价格的组成因素,主要包括支付方式、网价、基准价、财务费用和资金占用费等,紧接着通过结算和付款方式、钢筋采购金额计算,论述了钢筋采购价格计算,最后提出了一些价格控制要点,旨在将采购价格保持在可控范围内。     

熔窑建造过程中的材料管理与控制

通过对熔窑材料的管理和控制的介绍,指出了熔窑建造用钢材、砖材等在采购、施工过程中需要注意的事项和控制要点。通过加强对熔窑材料的管理和控制,做好材料的订货、验收、运输、仓储、使用等各个阶段的工作,不仅能保证熔窑建造的质量和进度,还能有效地避免浪费,降低熔窑建造的成本。     

压力容器壳体制造材料的检验与保护

本文所述压力容器壳体制造材料的检验与保护,是指压力容器制造厂对壳体材料,在采购、保管、发领、使用以及交付使用前或交付安装前的检验和保护。压力容器壳体材料（以下简称钢材）主要为钢板、钢管等,它们是压力容器主要受压元件。钢材的质量直接影响着压力容器的质量...     

浅谈某焦化、甲醇总承包项目采购的质量、进度、费用控制

结合某焦化、甲醇EPC工程总承包项目的采购实践,分析了项目采购盈利的原因及相关采购经验;着重从质量、进度、费用控制三大方面阐述了有关控制措施和加强采购管理所带来的经济效益;采购工作的质量、进度、费用三大控制紧密相连,只有做好三者的有机统一,才能发挥出采购的重要作用。     

工程物资采购全过程中的质量控制

本文从采购全过程质量控制的三个阶段,分别给出了质量控制的要点和措施,来确保采购质量。     

层次分析法在钢材质量控制中的应用

本文根据影响钢材质量的各种因素,运用层次分析法,定量确定出影响钢材质量各因素的相对重要性。为钢材质量控制提供一定的理论依据与实践指导。     

石化企业采购物资质量控制现状及解决措施

采购物资质量是石化企业物资供应关注的重点内容,它直接决定了企业生产建设能否顺利实施。本文结合石化企业生产建设特点,分析当前石化企业物资采购质量控制方面的现状,从项目管理、供应商质量管理、质量成本管理、全过程质量控制等视角,提出加强质量管理及控制物资采购质量的措施。     

浅谈物资采购质量的控制

控制物资采购的质量是物资采购全过程中最重要的工作，应从采购源头消除采购质量风险、从采购过程控制采购质量问题的发生、从后期使用上跟踪采购物资的质量状况，真正做到全过程控制，实现安全采购、安全供应，为油田生产提供优质服务。     

中原油田：牢牢锁定钢材资源

通过强化市场行情分析、加大供需协调力度、合理运用采购策略,在＂服务生产、保供降本＂上取得良好效果。近年来,针对钢材资源紧缺、价格攀升等不利形势,中原油田物资供应处坚持实施科学理性采购,通过强化市场行情分析、加大供需协调力度、合理运用采购策略,在＂服务生产、保供降本＂上取得良好效果。2010年,共锁定建筑钢材2800吨,各类钢丝绳、无缝钢管、焊接钢管、钢板等1200吨,不仅满足了油田生产建设物资的需要,而且节约采购资金60余万元。     

材料可靠性鉴别在采购质量控制中的运用

对金属材料的采购质量进行严格管理与控制,是确保企业安全生产和职工生命安全的前提。本文通过对现行石油石化企业采购质量管理制度、质量控制措施的分析,查找漏洞,提出利用便携式X射线荧光光谱分析仪,对承压设备的金属部件进行材料可靠性鉴别,从检测手段、检验范围、管理制度等方面出发构建出新的采购质量控制管理体系。     

提高麦尔兹窑寿命的研究与实践

介绍了包钢麦尔兹窑损坏的主要现象,分析了损坏原因,并采取了相应的改进措施。通过优化工艺,严格控制原料质量,控制石灰烧成温度,控制喷枪火焰长度,加强关键部位耐火材料砌筑质量,加强日常管理,取得了较好的使用效果。     

用于ASME MC级安全壳容器的SA-738Gr.B钢板夏比冲击试验的监造要点

为有效控制用于ASME MC级安全壳容器的SA-738 Gr.B钢板夏比V型缺口冲击试验,从试验材料、试验设备、试验人员及其操作、试验结果的处理等四个方面分析夏比冲击试验监造过程中的监造要点。对SA-738 Gr.B钢板夏比V型缺口冲击试验的监造要点的分析,不仅有利于提高产品的质量,也为其他材料的监造提供了一个参考思路。     

改进石墨电极质量与降低电极消耗的探讨

综述炼钢用石墨电极在工作中消耗的主要原因,分析了电极消耗和电极质量的关系。指出了原材料质量的重要性;提出了添加炭纤维改善电极强度,改进电极接头形状,减少接头故障;使用超声波技术监控电极质量等措施。     

钢水“脱氧合金化”配料方案的优化

脱氧合金化是钢水冶炼中的重要环节之一,此工艺是通过向钢水中添加不同的物料,使最终的成品钢拥有某些特定的物理属性。在钢水的脱氧合金化过程中,合金的加入量极大地影响着最后成品钢的质量。对在保证钢水质量的同时,如何将合金钢的生产成本降到最低的问题,提供了炼钢过程中合金料的成本优化方案。     

Method of raw materials selection for production of the MgO-C bricks of comparable properties using PCA and K-medoids

MgO-C refractories are zonally installed in most of the key heat devices of steel and iron metallurgy with the exposure to various corrosive factors. One of the most significant factors is low-temperature decarburization resulting in the oxidation of carbon in MgO-C refractories and loss of its properties. Moreover MgO-C materials are exposed for direct attack of liquid slag or steel melt which easily infiltrate the porous, decarburized hot face of the bricks. Cost of MgO-C materials of high quality is important for refractories user. For this reason researches try to develop materials of high quality but with lower cost by substituting fused raw materials with sintered ones or with recycled MgO-C. In this article, method of selecting the raw materials for production of MgO-C bricks with comparable properties is shown. Twenty different variants of MgO-C materials were prepared with the use of various quality raw materials. Basic properties of the industrially produced MgO-C bricks were measured. To select recipes with similar quality principal components analysis method and K-medoids algorithm were applied. To verify the results corrosion resistance of selected MgO-C materials were tested with the use of induction furnace of medium frequency.     

汽车涂装前处理槽液的工艺管理

在钢铁的制造、冲压成型中,会使用各种保护油、润滑油、冲压油、粘合剂、焊接助剂等,而要得到光滑平整、耐腐蚀好、附着力好的涂层取决于工件表面的清洁程度及磷化膜的质量。前处理就是对铁板、钢板、镀锌板等金属的表面进行清洗、化学处理而使底材易于电泳涂装,从而得到所需的防腐蚀涂层。本文针对汽车涂装前处理在实际生产过程中存在的工艺管理问题,结合本公司实际从技术角度阐述了其对涂装质量的影响。     

孔网钢带塑料复合管的生产过程及工艺优化

介绍了孔网钢带塑料复合管的性能、结构及复合管的生产过程，分析并提出相应的生产改进措施，对增强塑料材料与钢板的复合带来了一定的好处，可有效的提高管道成品率。也对于减小复合管增强体(钢带)的用量、节约成本、提高工程应用质量具有重要的意义。     

连铸用功能耐火材料的发展

新的冶炼技术和连铸新工艺的发展使连铸用功能耐火材料面临前所未有的挑战。研制开发多功能、高性能和长寿命的连铸用耐火材料是今后主要的研究课题。本文讨论了影响浸入式水口、长水口及整体塞棒使用寿命的主要因素 ,并阐述了改善性能、延长使用寿命的措施     

Low-nitrogen coal as a carburizer in the production of special steels

Residual elements in the batch have a considerable influence of the quality of converter steel. Of these, nitrogen is the most difficult to regulate in smelting and represents one of the main obstacles to the production of high-quality steel—in particular, steel for wire rod, springs, and cord [1–3]. High nitrogen content in steel produces strain aging and is associated with lower plasticity of cold-rolled and tempered low-carbon steel sheet. Carbon-bearing materials—carburizers—are used for ladle treatment of such special steels. Such materials must have a low content of nitrogen and sulfur (≤ 0.5%). In addition, their moisture content and yield of volatiles must be as low as possible. They are confined to size class 6-1 mm.     

Dynamic interaction of refractory and molten steel: Effect of alumina-magnesia castables on alloy steel cleanness

High quality alloy steel is an important material needed for social and economic development. It is of great significance to major national projects and defence security. Refractories are used in the smelting process of steel; they are some of the main sources of impurities which have an important effect on the quality of steel. As alumina-magnesia refractories are the main lining materials used for steel refining, the influence of these refractories on the cleanliness of molten steel under dynamic smelting conditions has been studied. The size, quantity, composition, and structure evolution of inclusions in steel are analysed. The results show that after smelting, the content of alloy elements in the steel is stable, and that the total oxygen content and inclusions in the steel are increased by the corrosion of the alumina-magnesia castables. However, the maximum average particle size of the inclusions in the steel was limited to 20?µm, which did not cause large inclusions in the steel or seriously affect the quality of steel. During the dynamic melting process, because of the presence of Si and Mn in the alloy steel, the inclusions changed from homogeneous CaS wrapped Al₂O₃-MgO composite sphere to MnS wrapped egg-shaped structure. The alloy elements in steel were found to be beneficial, as they reduced the effect of alumina and magnesia inclusions on the quality of steel. The results indicate that it is feasible to smelt high quality alloy steel using alumina-magnesia carbon-free castable, and that it would be better to limit the refining time to 45?min during smelting.