高性能耐候桥梁用钢HPS70W的生产实践

通过使用TMCP工艺生产高性能耐候桥梁用钢HPS70W的生产实践,主要讨论了两种不同厚度钢板的生产工艺和组织性能,该钢完全符合或超过美国标准《桥梁结构钢ASTM A709》的高性能桥梁用钢HPS70W的要求。     

新型耐候桥梁钢A709M—HPS485W的开发

介绍了HPS钢的概况,舞钢研发生产新型跨海大桥用钢HPS485W的关键工艺、焊接试验等。对舞钢供旧金山新海湾大桥项目用HPS485W实物性能进行了简要介绍。     

高性能耐候桥梁钢的开发及应用

采用低碳及合金化成分设计,利用TMCP+回火工艺,开发出HPS 485W耐腐蚀桥梁钢.利用拉伸、冲击、弯曲、扫描电镜和EBSD等手段,研究了钢板的组织和性能.结果表明,HPS 485W熔炼成分、钢板探伤、耐大气腐蚀指数(I值≥6.5)及力学性能均满足标准要求,组织为铁素体和贝氏体,铁素体含量达到62.7％,平均晶粒尺寸仅为2.95μm,保证钢板具有良好的抑制裂纹扩展的能力以及桥梁结构长期服役的安全性.     

美国高性能桥梁用钢研发现状

介绍了美国高性能桥梁用钢研发现状,包括其组织机构、研发历程、用钢特点以及生产和应用现状,并对其开发的HPS 50W、HPS 70W和HPS 100W系列钢种的化学成分和力学性能进行了对比、分析.     

500 MPa级高性能桥梁结构用钢的研发

介绍了高性能桥梁结构用钢板Q500q E的成分设计思路、生产工艺控制要点和产品实物性能。南钢采用低碳成分设计和TMCP+回火工艺技术,生产出集高强度、高韧性、抗震(低屈强比)、易焊接等多项性能为一体的高性能桥梁结构钢;该钢种同时还具有低冷裂纹敏感性指数及优异焊接性能,可以满足未来高速、重载、大跨度、全焊节点铁路桥梁用钢的需求。     

高性能桥梁结构用Q370qE钢的研制

介绍了高强度桥梁用Q370qE钢的研制过程,阐述了Q370qE钢的化学成分、加热、轧制及加速冷却工艺的设计方法,并结合工业试制情况对实物性能和组织进行了分析.     

日本的桥梁用钢

介绍了日本桥梁用钢的研发现状。其桥梁用钢的发展主要表现为高强度钢板、易焊性钢板及耐蚀性钢板等。高性能钢是日本桥梁用钢的发展方向。针对日本高性能钢的成分、力学性能及焊接性能进行了阐述。     

TMCP工艺对高性能桥梁钢Q370qE-HPS组织性能的影响研究

为了研究TMCP工艺对Q370q E-HPS高性能桥梁钢组织和性能的影响,达到替代正火工艺的目的,对终轧温度、开冷温度、返红温度及冷却速率等TMCP关键工艺参数与组织、力学性能的关系进行分析。结果表明:采用两阶段控轧控冷工艺生产Q370q E-HPS钢时,随终轧温度升高、开冷温度降低、返红温度升高及冷却速度降低,铁素体晶粒尺寸增大,珠光体含量增加,屈强比降低。通过工艺参数优化,可获得合适尺寸和体积分数的铁素体和珠光体,实现Q370q E-HPS钢良好的强韧性匹配和较低的屈强比。     

水电用高强度压力钢管用钢的研制开发

介绍了首钢采用TMCP＋回火工艺成功生产出SG610CFD水电用高强钢的研制开发过程。SG610CFD水电用高强钢采用铌、钒和钛复合处理,钢板回火后屈服强度为570～590MPa、抗拉强度为670～700MPa、-20℃低温横向冲击吸收功均大于200J。钢板成分设计和工艺路线合理、性能优异。     

Optimization of HPS 70W Applications

In February 1996 the Tennessee Department of Transportation, in cooperation with the Federal Highway Administration, the American Iron and Steel Institute, the U.S. Navy, and various steel plate manufacturers, agreed to design the first bridge in the United States to use HPS 485W (70W) steel. Since that time the department has constructed a second bridge using HPS 485W (70W) and has let to contract a third bridge that uses HPS 485W (70W) in both quenched and tempered and thermomechanical controlled processing HPS 485W (70W) steel. This paper will discuss lessons learned in the process and present optimization techniques employed.     

Assessment of AASHTO LRFD Specifications for Hybrid HPS 690W Steel I-Girders

This paper details research conducted to determine the applicability of the 2nd and 3rd editions of the AASHTO LRFD Specifications to hybrid I-girders fabricated from high-performance steel (HPS) 690W (100?ksi) flanges and HPS 480W (70?ksi) webs. Specifically, the scope of this paper is to evaluate the applicability of the negative moment capacity prediction equations for noncomposite I-girders subjected to moment gradient. This evaluation is carried out using three-dimensional nonlinear finite-element analysis to determine the ultimate bending capacity of a comprehensive suite of representative hybrid girders. In addition, a design study was conducted to assess the economical feasibility of incorporating HPS 690W (100?ksi) in traditional bridge applications. This was accomplished by designing a series of I-girders with varying ratios of span length to girder depth (L/D ratios) for a representative three-span continuous bridge. Results of this study indicate that both the 2nd and 3rd editions of the specifications may be used to conservatively predict the negative bending capacity of hybrid HPS 690W (100?ksi) girders, however increased accuracy results from use of the 3rd edition of the AASHTO LRFD Specifications. Thus, it is concluded that the restriction placed on girders fabricated from steel with a nominal yield strength greater than 480?MPa (70?ksi) can be safely removed. Additionally, results of the design study demonstrate that significant weight saving can result from the use of hybrid HPS 100W girders in negative bending regions, and that hybrid HPS 690W/HPS 480W girders may be ideally suited to sites with superstructure depth restrictions.     

高性能海洋工程用钢的智慧研发之一

简要论述了海洋工程用钢铁材料的性能特点及发展方向,指出了目前海工钢产品在研发、生产、服役过程中存在的部分问题和不足。通过对钢铁材料研究现状的分析,提出基于钢铁材料基因组工程建立成分、工艺、组织及性能之间的内在联系,进而利用大数据建设建立定量化关系实现海工钢智慧化的有效研发。     

铌对美标桥梁结构钢板性能的影响

通过向桥梁结构钢板HPS70W中添加不同含量的Nb元素,研究了合金元素Nb对桥梁结构钢板的力学性能、金相组织和第二相粒子析出的影响。试验结果表明,合金元素Nb对桥梁结构钢板HPS70W低温韧性、强度和塑性有显著影响。     

Simplified Moment Redistribution of Hybrid HPS 485W Bridge Girders in Negative Bending

Simplified moment redistribution procedures based on shakedown have recently been approved by AASHTO LRFD Bridge Design Specifications (AASHTO 2004). These procedures are currently only applicable for homogeneous girders, and thus, the objective of this study is to evaluate whether these procedures can be further applied for hybrid HPS 485W girders. A parametric study is carried out using validated three-dimensional finite-element (FE) analyses to study the inelastic behavior of hybrid HPS 485W girders in negative bending for this purpose. The effective plastic moments obtained from the FE studies are compared with those from the proposed prediction equations, where good correlation is observed. A design example of a three-span slab-on-girder bridge with hybrid HPS 485W girders using both elastic design and the simplified moment redistribution procedures is also presented, where it is shown that the use of moment redistribution procedures results in a negative bending section that is 13% lighter than the corresponding elastic design.     

高强度桥梁结构钢Q370qE开发

Q370qE属于较高质量等级桥梁结构用钢板,要求良好的低温冲击韧性、优良的焊接性能与较高的强度相结合,综合性能优良,且有一定的耐候性。本文介绍了该产品化学成分设计、冶炼工艺、精炼工艺、控制轧制与控制冷却工艺,并通过微合金化配合TMCP轧制工艺的工业试验进行了验证,成功试制出合格产品,取得良好效果。     

贮罐和压力容器用高性能厚板的开发

为了满足能源领域的需求,JFE公司开发了高性能即韧性、强度和焊接性都优良的610MPa级高强度系列钢板,包括高焊接性的JFE—HITEN610U2、低温贮罐用JFE—HITEN610U2L和大输入热量焊接用JFE—HITEN610E。这些产品的特点是低C、低Pcm（焊接裂纹敏感性成分）和不加入B。由于采用了微合金化技术和超级在线快速冷却（Super—OLAC）的直接淬火—回火工艺,从而获得了优良的母材及焊缝性能。另外,针对市场对高可靠性超厚钢板的需求,开发了采用锻造、轧制工艺和高质量连铸板坯生产超厚钢板的技术,在压力容器用SQV2B板和200mm厚度级别的超厚板生产中,实现了优良的内部质量;且这些产品都有了较多的应用实绩。     

我国高性能管线钢埋弧焊焊丝的研究进展

简述了我国输油气管线钢的生产和应用,介绍了管线钢制管用埋弧焊焊丝研制工作。包括X60～X80级别管线钢的H08C、H08D、H05M、H03M系列埋弧焊丝的设计思想、成分设计及性能特点。还指出了X100级别高性能管线钢制管用焊丝的发展方向。