莱钢抗震结构用热轧带肋钢筋的研发

介绍了莱钢结合HRB400热轧带肋钢筋生产经验，按钢筋的钢种、规格大小采用不同的微合金化方法，进行窄成分范围设计；并采用了合理的冶炼和加热、轧制等生产工艺参数，成功开发了HRB500E抗震钢筋，并优化提升了HRB400E钢筋的抗震指标。证明莱钢目前生产的抗震钢筋抗震性能优良，强屈比、延伸率、冷弯性能均达到了标准要求，具有较好的综合性能，能够较好地满足工程抗震设计、施工的要求。     

提高HRB400热轧带肋钢筋抗震性能研究

概述了抗震钢筋的性能要求，莱钢HRB400热轧带肋钢筋的性能状况，提出了进一步提高钢筋抗震性能的措施。     

HRB400E抗震钢筋研制与开发

建筑结构的快速发展对建筑用钢材提出了越来越高的要求。特别是在汶川地震后,高强度、高性能抗震钢筋的生产开发成为国内外的研究热点。灾后重建及国家实施的基础设施建设的大量投入,都需要大批量的高强度抗震钢筋,适应建筑钢材升级换代的市场需求,提高螺纹钢产品的市场竞争力。在钢筋的生产中,普遍采用钒氮微合金化＋控制轧制的方式来实现晶粒的细化,以获得良好的综合性能。     

HRB500E抗震钢筋试制

介绍了抗震钢筋的市场现状与包钢研制抗震钢筋的重要性及必要性。重点对HRB500E抗震钢筋进行研发试制,在工艺参数不稳定的情况下提出了对HRB500E抗震钢筋的成分设计。从而使HRB500E抗震钢筋性能满足用户需要。针对包钢发展现状,为今后HRB500E抗震钢筋的发展提出了研究方向。     

广钢转炉冶炼HRB500E抗震钢筋钢生产实践

近年来,广州市及珠三角市政建设和重点工程广泛应用抗震钢筋,对热轧带肋钢筋的强度和抗震性能均有较高的要求。广钢电炉厂已开发生产了各个牌号抗震钢筋钢,并一次性通过国家抗震钢筋生产许可认证。为进一步降低生产成本,满足市场需求,通过生产实践,在转炉成功开发了HRB500E抗震钢筋钢并实现了规模化生产,解决了电炉生产抗震钢筋钢成本偏高、规模化生产受到限制等诸多问题。     

承钢抗震钢筋抗震性能试验研究

通过试验手段，对承钢抗震钢筋的应变时效敏感性、韧脆转变温度、可焊性、强度与塑性配合、高应变低周疲劳等抗震性能进行了系统的研究，证明承钢利用钒微合金化技术开发的抗震钢筋的性能优于普通的HRB400和HRB335钢筋，具有良好的塑性、韧性和可焊性，可更好的满足地震区、非地震区和寒冷地区建筑物要求。     

承钢抗震钢筋抗震性能试验研究

通过试验手段，对承钢抗震钢筋的应变时效敏感性、韧脆转变温度、可焊性、强度与塑性配合、高应变低周疲劳等抗震性能进行了系统的研究，证明承钢利用钒微合金化技术开发的抗震钢筋的性能优于普通的HRB400和HRB335钢筋，具有良好的塑性、韧性和可焊性，可更好的满足地震区、非地震区和寒冷地区建筑物要求。     

莱钢抗震结构用热轧带肋钢筋的研发

介绍了莱钢结合HRB400热轧带肋钢筋生产经验．按钢筋的钢种、规格大小采用不同的微合金化方法,进行窄成分范围设计;并采用了合理的冶炼和加热、轧制等生产工艺参数,成功开发了HRB500E抗震钢筋,并优化提升了HRB400E钢筋的抗震指标。证明莱钢目前生产的抗震钢筋抗震性能优良,强屈比、延伸率、冷弯性能均达到了标准要求,具有较好的综合性能,能够较好地满足工程抗震设计、施工的要求。     

VN微合金化HRB400E抗震钢筋的研制

采用VN微合金化工艺进行HRB400E抗震钢筋的试制,通过对钢筋化学成分、冶炼工艺和轧制工艺的合理设计,成功试制出HRB400E抗震钢筋。对抗震钢筋的力学性能、应变时效性能、金相组织进行研究,结果表明试制的抗震钢筋具有较高的强度和塑性,以及良好的应变时效性能,金相组织正常,能满足GB 1499.2-2007抗震钢筋的要求。     

HRBF500E超细晶粒抗震钢筋的开发

分析了HRBF500E超细晶粒热轧抗震钢筋的技术要求。通过化学成分和控轧控冷工艺的优化设计，不添加任何微合金元素，实现了HRBF500E超细晶粒热轧抗震钢筋的批量生产，产品质量达到了GB1499．2—2007的要求，提高了产品档次和技术含量。     

Energy-saving manufacturing technology for high-strength metal products

The use of heat-strengthened blanks to manufacture cold-deformed rebar and high-performance bolts permits the elimination of some operations in the production process, with corresponding energy savings. The complete research cycle includes the development of the technology, formulation of the documentation, and industrial trials.     

Comprehensive Properties of 400 MPa Grade Corrosion-Resistant Rebar

 The corrosion resistance of the developed 400 MPa grade rebar was evaluated by a series of experiments, including cycles of corrosion-accelerating tests in the simulated concrete pore solution and reinforced concrete cube corrosion-accelerating tests and in-situ exposure experiments in chloride ions condition. In addition, the tensile and bending properties and the connection adaptability of the developed rebar were investigated. The results verify that the comprehensive properties of the corrosion-resistant rebar are excellent. The tensile and bending properties of the rebar are up to the standard of GB1499-2007. The common welding method and the mechanical connection technology of knob-cut rolled parallel thread splicing are suitable for the rebar.     

中国热轧带肋钢筋的发展和现状

热轧钢筋是主要建筑用钢之一，中国与世界主要工业国家的钢筋应用水平相比还有较大差距。简述了中国热轧钢筋半个多世纪的发展历程；阐明了HRB335、HRB400以及HRB500钢筋的生产现状；指出了中国的热轧钢筋已取得长足的进步，技术水平和质量性能得到很大提高，目前正处于推广应用HRB400Ⅲ级钢筋的重要时期，进一步优化HRB400生产工艺、提高钢筋质量性能有重要意义。     

Bond Strength of Fiber Reinforced Polymer Rebars in Normal Strength Concrete

The bond behavior of reinforcing bars in concrete is a critical issue in the design of reinforced concrete structures. This study focuses on the bond strength of fiber reinforced polymer (FRP) rebars in normal strength concrete. Four different types of rebars were tested using the pullout method: aramid FRP (AFRP); carbon FRP (CFRP); glass FRP (GFRP), and steel. This involved a total of 151 specimens containing 6, 8, 10, 16, and 19?mm rebars embedded in a 203?mm concrete cube. The test embedment lengths were five, seven, and nine times the rebar diameter (db). For each rebar, the test results include the bond stress–slip response and the mode of failure. The test results showed that the bond strength of an FRP rebar is, on average, 40–100% the bond strength on a steel rebar for pullout failure mode. Based on this research, a proposal for the average bond strength of straight FRP rebars in normal strength concrete is made, which verifies an existing bond strength relationship (GFRP) and extends its application to AFRP and CFRP. It is an expression that is a function of the rebar diameter, and the concrete compressive strength.     

热轧带肋钢筋加工中心的设计

介绍了年产10万t商品钢筋的加工厂的产品方案、工艺流程、设备组成及设备主要性能参数,加工厂包括钢筋盘卷矫直剪切、钢筋焊接网、钢筋弯箍、钢筋定尺剪切、钢筋折弯和钢筋机械连接等生产线。并指出钢筋加工中心的设计、生产和产品销售必需功能强大的计算机系统和管理软件的支持,商品钢筋的推广和建筑机械化施工技术的进步必须由钢筋生产、加工、工程设计、工程业主和施工单位共同来努力,才能真正发挥其综合效益。     

Thermal Compatibility of Concrete and Composite Reinforcements

Experiments on commercially-produced composite reinforcements have shown that the transverse coefficients of thermal expansion (CTE) of these rebar are 3–5 times higher than the CTE of concrete. In this paper, thermoelastic solutions of plain and spirally wrapped composite rebar, embedded in concrete and subject to a uniform temperature increase, are presented. Comparisons are made between bars with no spiral wrapping and those produced with a spiral wrap of unidirectional rovings. Results show that the spiral wrapping, included primarily to improve the bond between the concrete and the composite rebar, also aids in the reduction of overall thermal expansion of the rebar. Thermoelastic solutions of unidirectional composite rods and concrete predict that the tensile stresses in the concrete surrounding the rebar will exceed the tensile strength of the concrete for relatively small temperature increases. The extent of this cracking cannot be determined from the analytical predictions. To predict the extent of the cracking, nonlinear thermoelastic simulations, completed using the COSMOS-M finite-element code, are used to determine the extent of concrete cracking. Results show that cracking decreases with a decreasing rebar diameter and increasing confining pressure of the concrete.     

HRB400热轧带肋钢筋的性能分析

为了扩大经营品种，2002年3月韶钢用大电炉生产工艺试制与开发了HRB400Ⅲ级钢筋，本文重点对成品的性能和V微合金化的强化机理进行了分析，分析结果表明，试制的HRB400钢筋性能符合GB1499－1998标准要求，并同时满足二级抗震钢筋的性能要求，生产HRB400钢筋比生产HRB335钢筋可增加销售利润约90元／t。     

铌微合金化HRB400热轧带肋钢筋在高速线材机上的生产实践与探讨

水钢第一轧钢厂在高速线材轧机上生产铌微合金化HRB400热轧带肋螺纹钢筋,除成品孔型采用碳化钨螺纹辊环外,其余全部使用原孔型系统,产品力学性能达到了Ⅲ级螺纹钢标准。同时对影响钢筋力学性能、金相组织的因素进行了分析和探讨。     

HRB400E含镍铬钢筋的试制

 根据某企业以红土镍矿为高炉配矿,因此铁水、钢水中含镍铬元素的特点,提出充分利用镍、铬元素的强化作用开发HRB400E级高强抗震钢筋的研究思路。通过实验室试验,研究了在20MnSi的基体上镍、铬元素的作用规律,优化了钢筋中的镍、铬质量分数。开发的HRB400E级含镍、铬钢筋,镍、铬元素质量分数均为0.2%,力学性能完全满足国家标准的要求,并且无需添加铌（钒）等其他微合金元素。