前4个月，物流与生产资料市场运行基本平稳、结构优化。一方面，市场规模增速稳中小幅回落，但保持较快增长；另一方面，在增速回落的同时，市场结构向好转变、流通方式加快转型。当前经济运行中值得关注的问题，主要表现在两个方面：一是宏观层面上，投资需求偏弱;二是微观层面上，企业资金紧张、应收账款大幅上升。此外，企业经营面临的政策环境有待进一步优化。从后期走势看, PMI 指数连续两个月小幅回升，市场需求有所改善，生产资料市场价格呈现出趋稳走势，显示出宏观经济运行积极向好发展具有一定的基础。在此背景下, 行业保持平稳运行仍具备有利条件。

关键词：煤炭；钢材；有色金属；天然橡胶；汽车

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The Ti-6Al-7Nb alloy was specially developed to replace the well-known Ti-6A1-4V alloy in biomedical applications due to supposed cytotoxicity of vanadium in the human body. This alloy is normally fabricated by conventional ingot metallurgy by forging bulk material. Nevertheless, powder metallurgy techniques could be used to obtain this alloy with specific properties. This is because by changing the processing parameters, such as the sintering temperature, it is possible to vary the porosity level and to tailor the final properties. This work deals with the production of the Ti-6Al-7Nb alloy by means of the master alloy addition variant of the blending elemental approach. The powder is processed by means of different powder metallurgy routes considering diverse processing conditions for each method. The materials are characterised in terms of microstructural features, relative density and hardness. Homogeneous microstructures as well as properties comparable to those of the wrought alloy are generally obtained.

关键词：TI-6AL-7NB；钛粉末冶金；混合元素（BE）；母合金

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2014年6月份，钢材价格指数较5月末小幅回落，创出历史新低；6月份钢铁行业累计固定资产投资同比维持下降态势；1-6月份我国生铁和粗钢产量环比下降，钢材产量有所增长；粗钢产量占全球比重小幅回升，略高于50%的水平；6月份钢材出口量出现回落，外部钢材需求走弱；进口量呈现回落走势。整体来看，6月份我国钢铁产量维持高位，供给压力仍然较大，而需求情况没有明显好转。

关键词：钢铁行业；运行分析

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《证券日报》07月18日报道，自去年以来，国内期货市场迎来了新品种上市潮。今年以来，除了已上市的聚丙烯期货、热轧卷板期货以及晚籼稻期货之外，铁合金期货也有望下月上市。有业内人士表示，如果进展顺利，铁合金期货将于8月8日上市。

关键词：钢铁行业；要闻综述

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2014年2季度，我国颁布了新的《环境保护法》，此次修改明确了新世纪环境保护工作的指导思想，加强了政府对于环保的监督责任，以推进环境保护法及其相关法律的实施。对于钢铁行业来说，新《环境保护法》使钢铁行业面临更为严格的限制条件；国务院印发了《2014-2015年节能减排低碳发展行动方案》，意在进一步推进节能减排相关工作，确保全面完成“十二五”节能减排降碳目标；我国钢铁产品相关贸易保护案件数量为9起，较2014年1季度增加2起。

关键词：钢铁行业；政策环境

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Fine balance between active galvanic and passive barrier corrosion protection by zinc-rich hybrid paints is explored depending on the absolute and relative amounts of the electrically semi-conducting particles, viz. polypyrrole (PPy) modified alumina hydrate and multi-walled carbon nanotubes (MWCNTs) and the zinc pigments. The former was varied between 3.21 and 1.75 wt., the latter was altered from 70 to 80 wt.in the primers. The coating with less zinc indicated firm and stable barrier nature in a 254 h immersion test whereas the primer with greater zinc content afforded superior galvanic corrosion prevention in salt-mist test over 142 days. Different nature of the coatings are expounded on the basis of structure and 3D arrangement of the nano-size inhibitor particles in the epoxy vehicle besides interpreted considering varied grain contents caused changing electrical percolation and electrolytic conductivity of the primers.

关键词：钢铁;纳米管;低碳钢;富锌涂料

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Brillouin-scattering Optical Time Domain Reflectometry (BOTDR) is a viable technology for simultaneous, distributed strain and temperature measurements for miles-long transportation structures. It is a promising tool to ensure the smooth operation and safety of bridge structures that are key links in surface transportation networks or between various transportation modes: i.e., from airport to train station. Currently, telecom-grade optical fibers are widely used in civil engineering for strain and temperature measurements. These fibers are very fragile and easy to break during installation and measurement. In order to understand the ultimate behavior of structures, more rugged optical fibers such as carbon/polyimide coated fibers were recently proposed. One laboratory study on two single fibers indicated that new carbon/polyimide coated fibers can sustain a maximum strain of up to 4, which can survive any local crack in concrete members or buckling in steel members once they are installed on the structural members. This project aimed to characterize the ruggedness and signal loss of various packaged optical fibers and validate their performance as sensors. Among the tested optical fibers, bare single-mode fibers (SMF-28) with uncoated anchoring have the lowest shear strength and the lowest ultimate strain under tension, and are thus not suitable to apply in harsh environments. Polyimide-coated optical fibers have the highest shear strength and the highest ultimate strain under tension, making them the best candidate for civil infrastructure applications. Both glass fiber reinforcing polymer (GFRP) and carbon coated optical fibers are sufficiently rugged to be applied to civil infrastructure.

关键词：钢铁;光纤;应变测量;交通安全;桥梁

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The relative armor penetration ability of different kinds of projectiles is of general interest from both offensive and defensive viewpoints in law enforcement and military applications. This paper presents data on armor penetration of four different projectile types (all in 5.56mm NATO) on both 6.35mm thick steel plate (A36) and proprietary glass/aramid composite armor. The bullet penetrating steel plate most readily was the M855 bullet which has a steel penetrator core. This bullet had a V50 of 1992 ft/s. The second best penetrating bullet in steel plate was the jacketed lead core M193 bullet with a V50 of 2240 ft/s. The solid copper bullet had a much higher V50 in the steel plate at 2514 ft/s. The solid brass bullet was the worst penetrator in the group with a V50 of 2612 ft/s in the steel plate. The relative penetration ability was different in the composite armor. The best penetrator was once again the M855 bullet with a V50 of 1945 ft/s. However, the second best penetrator was the solid brass bullet with a V50 of 2868 ft/s. The third best penetrator was the solid copper bullet with a V50 of 2960 ft/s. The worst penetrating bullet in the composite armor was the jacketed lead core M193 bullet with a V50 of 3049 ft/s.

关键词：钢铁；合装甲；装甲；黄铜；铜

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关键词：钢铁；形状记忆合金；执行器；二元合金

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This investigation was prompted by results of a qualification test of a mechanism to be used for the James Webb Space Telescope. Post-test inspections of the qualification test article revealed some loose wear debris and wear of the steel rollers and the mating Ti6Al4V surfaces. An engineering assessment of the design and observations from the tested qualification unit suggested that roller misalignment was a controlling factor. The wear phenomena were investigated using dedicated laboratory experiments. Tests were done using a vacuum roller rig for a range of roller misalignment angles. The wear in these tests was mainly adhesive wear. The measured wear rates were highly correlated to the misalignment angle. For all tests with some roller misalignment, the steel rollers lost mass while the titanium rollers gained mass indicating strong adhesion of the steel with the titanium alloy. Inspection of the rollers revealed that the adhesive wear was a two-way process as titanium alloy was found on the steel rollers and vice versa. The qualification test unit made use of 440F steel rollers in the annealed condition. Both annealed 440F steel rollers and hardened 440C rollers were tested in the vacuum roller rig to investigate possibility to reduce wear rates and the risk of loose debris formation. The 440F and 440C rollers had differing wear behaviors with significantly lesser wear rates for the 440C. For the test condition of zero roller misalignment, the adhesive wear rates were very low, but still some loose debris was formed

关键词：合金;滚筒；钢；钛合金；钒合金

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