【作者】 白敏；

【导师】 王伯健；

【作者基本信息】 西安建筑科技大学 ， 材料工程， 2015， 硕士

【摘要】 高强度镀锌钢丝是生产海工钢丝绳必备的元素,随着海洋工程领域的大力发展,海工钢丝绳市场越来越大,而目前海工市场主要为进口产品,要占领市场,实现替代进口,依靠国内原材料和钢丝绳技术开发高性能海工钢丝绳已经迫在眉睫。本论文重点研究适合海工钢丝绳用高强度镀锌钢丝的生产工艺,主要以三种不同化学成分的盘条、热处理工艺DV值、钢丝拉拔道次和热镀锌工艺DV值4项工艺控制要点作为基础,设计正交试验,并按照设计方案生产出高强度镀锌钢丝,通过研究四种规格钢丝的抗拉强度、扭转和弯曲以及锌层质量等性能,选择最佳的高强度镀锌钢丝的生产工艺,为海工钢丝绳生产提供参考。试验得出以下结论:(1)适合高强度镀锌钢丝生产的最佳工艺是:原材料选择SWRH82B盘条,热处理工艺DV值为80,钢丝拉拔道次为12道,镀锌工艺DV值为160,所生产的镀锌钢丝强度超过1870MPa,扭转、弯曲、上锌量指标超过了GB 8919-2006中的要求。(2)通过不同的工艺参数组合,生产出36种性能各异的高强度镀锌钢丝,并进行性能检测和分析,结果显示:四种规格钢丝分别进行的9组工艺方案均能够生产出合格的高强度镀锌钢丝,所有钢丝的性能均达到了1870MPa以上,扭转、弯曲、上锌量指标超过了GB 8919-2006中的要求。(3)通过工艺和金相组织对比,分别对钢丝性能差异的原因进行分析,结果显示:原材料中加入微量的Cr、V等合金元素,对钢丝性能影响不大;不同的热处理工艺DV值,对半成品组织索氏体化程度造成影响;不同道次的拉丝工艺使钢丝组织形态和组织变形产生的热量发生很大变化,从而影响钢丝的综合机械性能;热镀锌过程会降低钢丝抗拉强度、扭转和弯曲,不同的热镀锌工艺DV值,对纯锌层质量和合金层的致密性有极大的影响。(4)采用最佳工艺生产的高强度镀锌钢丝去捻制钢丝绳,对钢丝绳性能进行检测,结果显示:钢丝绳的实际计算破断拉力和最小破断拉力均超过标准要求的1870MPa;钢丝绳拆股钢丝机械性能和锌层质量也均超出标准要求。更多还原

【Abstract】 High tensile galvanize steel wire is the essential condition for marine rope production. With the development of ocean engineering, the market of marine rope enlarged rapidly. But the imported marine rope is dominating Chinese market. To capture the market share and achieve marine rope localization, it is an urgent task for developing high-performance marine rope with the domestic high-strength steel and independent rope technology. In this research we focus on optimum production process scheme during high tensile galvanize steel wire manufacture process, and we also statistics and analysis the property of the wires. In addition, influence of three different chemical composition wire rod, patenting DV values, number of multi-pass drawing and galvanize DV values are studied utilizing orthogonal test. Then the tensile stress, torsion, bend and the weight of zinc layer are measured for different wire types, which production process are designed by previous orthogonal test. In addition, the perfect production process scheme is selected for the manufacture of high tensile galvanize steel wires, and provide a frame of reference for marine rope production. Finally, we may conclude as follows:(1) The perfect production process scheme for high tensile galvanize steel wire is used i.e., SWRH82 B wire rod, patenting value set as 80, number of multi-pass drawing set as 12 times and galvanize value set as 160. The tensile strength for the wire is over 1870 MPa, and the value of torsion, bend and coated weight are reach to the requirement of national standard No. 8919-2006.(2) 36 different sizes high tensile galvanize steel wire are produced via four sizes combination with nine schemes. The mechanical performance test results show that all steel wires are acceptable product, and the tensile strength are above the 1870 MPa, the value of torsion, bend and coated weight are reach to the requirement of national standard No. 8919-2006.(3) According to the production process scheme and corresponding microstructure, we also research the wires mechanical performance difference, the result are show below. Firstly, the bad effect of few Cr and V elements in raw rod can be neglect. Secondly, the rate of sorbitizing is influence by patenting value. Thirdly, the microstructure deformation heat in different production process schemes have different effect to mechanical performance. Lastly, the process of hot galvanize will decrease the value of tensile strength, torsion, bend, and coated weight, coating compactness are influence by DV value.(4) The breaking force, split wire properties, wire zinc coating weight for marine rope are over the standard requirement 1870 MPa, which is entwisted by high tensile galvanize steel wires with perfect optimally process.更多还原