成分及工艺对16Mnq强度的影响

一、前言 16Mnq钢板是用于大型桥梁的高强度钢,其检验指标既多又高,而且指标之间有的相互制约,良好的综合机械性能所要求的成分、工艺波动范围小,冶炼及轧制的难度大。为了满足用户C+Mn/6+Si/24≤0.44的焊接要求,以往把碳含量内控在0.12～0.17％,因而出现了一定量的σ_s、σ_b达不到标准要求。1983年轧制的11202t16Mnq板中,强度不合改钢的占总量的5.4％。本文通过对生产数据的回归分析及轧制工艺的试验,讨论了成分及工艺对强度的影响,探讨了提高16Mnq强度的途径。     

模内吊挂稀土棒对16Mnq钢的影响

16Mnq一般是在大罐内加1~#稀土合金进行处理,稀土收得率低,效果十分有限,性能不合格率占11％,并且容易发生水口关不住等问题。采用模内吊挂工艺使16Mnq的稀土处理效果大大提高,浇注工艺也得到了相应的改善。     

连铸稀土钢结晶器保护渣的研制

针对生产16Mnq,A36等稀土处理钢使用普通保护渣存在的问题，分析了 稀土钢专用保护渣性能要求，阐述了其设计过程与试验，并开发了稀土钢专用保护渣，满足了板坯铸机生产稀土钢的要求。     

桥用l6Mnq热轧卷钢板试制

在转炉—连铸—热连轧短工艺流程上采用钢中控制细化晶粒的残余AI、Ti含量和轧钢采取控制总变形量为65%,最后一道次变形20%,终轧温度为900℃和650℃卷取的控制轧制工艺生产了桥用16Mnq钢卷,性能达到了技术指标要求,尤其是钢的低温冲击韧性得到了明显提高,解决了生产急需。     

鞍钢半连轧厂中厚板的控制轧制

根据中厚板控制轧制的基本原理,结合鞍钢半连轧厂控轧20g、16MnR、16Mnq中厚板的生产实际,阐述了工艺参数对控制轧制的影响,并进一步探讨了在现有条件下,该厂控轧中厚板的最佳工艺制度。     

钢材分类标号(二)

正5. 低合金高强度钢标号规则(1)钢号的表示方法,基本上和合金结构钢相同。(2)对专业用低合金高强度钢,应在钢号后标明。例如16Mn钢,用于桥梁的专用钢种为"16Mnq",汽车大梁的专用钢种为"16MnL",压力容器的专用钢种为"16MnR"。6. 易切削钢标号规则(1)钢号冠以"Y",以区别与优质碳素结构钢。     

对16Mnq钢板性能综合预控途径及效果的分析

1.前言低合金桥梁用钢板,按我国现行标准的要求,机械性能最多要检验七项,特别是按照达到国际水平的YB(T)10—81标准检验出厂,要求更严格。过去为了提高轧板厂生产的16Mnq用钢板的质量及合格率,曾多次进行了以提高某些质量特性值为目的的研究,实现单目标控制,收到了一定的效果。但由于桥梁钢关键性能之间,存在不同程度的制约关系,因而仅靠单目标控制,难以得到理想的综合性能,为了提高16Mnq用钢的综合性能,我们对综合预控的途径作了定量的探讨,提出了综合预控的模型,并通过综合预控,使产品质量有明显的提高。     

15MnVNq钢的研制总结

15MnVNq 钢是在16Mnq 钢的基础上加入 V 和 N 而研制成的新钢种。通过试验研究和生产实践,证明该钢种综合性能良好,基本上能满足建造大跨度栓焊桥梁用钢的需要。15MnVNq 钢充分利用我国富有的合金资源,生产工艺较简单,与强度级别相同的钢相比较成本低,应进一步推广使用。     

鞍钢150吨转炉扩大品种提高质量的技术措施

近几年来,鞍钢150t转炉生产的品种不断扩大。现已生产了九十四种碳素钢和低合金钢(锰钢、加稀土钢、锰钒钛钢、锰钼钒氮钢和铬钼钒钢等),包括结构钢、汽车用钢、锅炉用钢、石油管钢、压力容器钢、铁路用钢、塘瓷用钢、桥梁用钢、船舶用钢、氧气瓶钢、电工钢和供出口用钢等。其中,重深冲08镇冷轧汽车板钢、内圈网汽车轮网钢、65Y三角股钢绳钢先后被评为国家金牌产品;16MnR、16MnL、HG、16Mnq、J55、DZ_2、20gu等被评为部级优质产品。实践证明,转炉钢的     

减轻16Mn专用板的带状组织

16Mn是我国低合金高强度结构钢种之一，用途十分广泛，专业板16MnR、16Mnq、16MnL等不仅要求强度高(屈服强度大于345MPa，抗拉强度大于500MPa)，还要有良好的冷成型性，抗低温冲击性能。性能特征决定着化学成分必然是碳、锰含量较高(碳含量在0．12oA～0．20％，锰含量在1．20oA～1．60%)，以保证其强度。轧制时终轧温度较低(终轧温度在750~860℃之间)。以保证低温韧性。这不可避免地要加剧带状组织的产生，从而导致降低塑性，恶化钢板的冷成型性。本文结合酒钢中板厂投产初期生产的16Mn专业板的实际，探讨了带状组织形成的原因及改进措施。     

Mechanical and fatigue properties of self-piercing riveted j oints in high-strength steel and aluminium alloy

Static tensile and fatigue tests were performed on shear and tensile self-piercing riveted aluminium-steel structures to evaluate their mechanical and fatigue properties.The influences of the thickness and the strength of the high-strength steel on mechanical and fatigue performances were investigated based on the tensile and F-N curves of the joints.The results show that mechanical and fatigue properties of the shear self-piercing riveted joints are much better than those of the tensile self-piercing riveted joints.Mechanical and fatigue performances of the two joints were significantly influenced by the thickness and strength of the steel sheet, and were markedly improved when the thickness of steel sheet increased.The steel strength showed significantly different effects on shear and tensile riveted structures, i.e., when the steel strength increased, the strength of the shear structure greatly increased while the tensile structure just had a slight increase in the strength.Fatigue failure generally occurred in the sheet materials and the fa-tigue crack location changed with increasing the sheet thickness and the sheet strength.     

高强度建筑钢屈强比的研究

通过分析生产实际的数据和应用金相、扫描电子显微镜观察,对热轧态高层建筑钢板的屈强比的影响因素进行了分析,结果表明:随着钢板厚度的增加,屈服强度下降,抗拉强度有少许的上升,屈强比有明显的下降;随着C含量的增加,抗拉强度比屈服强度的上升快,钢板的屈强比减小,随着Mn、Si含量的增加,屈服强度、抗拉强度和屈强比增加;随着开轧温度、开冷温度的提高,屈服强度和屈强比均有明显的下降,而抗拉强度下降的幅度小;晶粒细化对屈服强度的提高比对抗拉强度的明显,并能显著的提高屈强比。     

Tensile Strength of Unsaturated Sand

A theory that accurately describes tensile strength of wet sand is presented. A closed form expression for tensile strength unifies tensile strength characteristics in all three water retention regimes: pendular, funicular, and capillary. Tensile strength characteristically increases as soil water content increases in the pendular regime, reaches a peak in the funicular regime, and reduces with a continuing water content increase in the capillary regime. Three parameters are employed in the theory: internal friction angle (at low normal stress) ?t, the inverse value of the air-entry pressure α, and the pore size spectrum parameter n. The magnitude of peak tensile strength is dominantly controlled by the α parameter. The saturation at which peak tensile strength occurs only depends on the pore size spectrum parameter n. The closed form expression accords well with experimental water retention and tensile strength data for different sands.     

控轧控冷工艺对X80管线钢强度影响的统计分析

重点分析了X80管线钢在控轧控冷过程中工艺对于屈服强度、抗拉强度的影响。通过大生产试验和数据回归,进一步分析出影响X80管线钢强度的主要因素,其中影响屈服强度主要因素为终轧温度、终冷温度,与其呈负相关;而冷却速率和Mo含量与其呈正相关。同时,影响抗拉强度的主要因素为终轧温度和终冷温度,与其呈负相关;而冷却速率、Mo含量和碳当量则与其呈正相关。最后得出了各个影响因素对强度影响的经验公式。     

汽车用高强度IF薄钢板

高强度ＩＦ薄钢板是近年来开发的一种兼有高强度和良好深冲性能的汽车用钢板，它是在ＩＦ钢基础上通过添加适量的固溶强化元素来达到高强度的，总结了这种钢中的合金元素对基板性能及热镀锌镀层的影响，另外还介绍了两种新型的高强度ＩＦ钢，结合宝钢设备的情况，分析了高强度ＩＦ薄钢板开发的可行性。     

Assessment of Residual Tensile Strength of Carbon/Epoxy Composites Subjected to Low-Energy Impact

This paper presents the results of an experimental study to investigate the effects of impact loading on the residual tensile strength of woven graphite epoxy laminates with a toughened resin system. In this study, both cross-ply, [0/90]6, and angle-ply, [±45]6, laminate lay-up configurations were studied and compared. Test specimens were subjected to various levels of impact loading, after which tensile pull tests were performed to determine the residual tensile strength properties. The study results demonstrated that impact damage causes a significant reduction in tensile strength properties of woven cross-ply [0°/90°] laminates. For example, cross-ply laminated composite specimens subjected to the lowest impact level, 6.8?J, exhibited a 25% decrease in ultimate tensile strength. Angle-ply woven laminates [±45°], however, exhibited an 18% increase in ultimate tensile strength after being subjected to 6.8?(J) impact. This characteristic of increasing tensile strength in [±45°] specimens is an example of increased fiber reorientation in composite laminates with limited fiber damage.     

Comments on coke quality characterization by tensile strength

According to theoretical and experimental investigations, the indirect tensile test turned out to be applicable to coke qualities. It was stated that:

相似文献   

Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440Cold Rolled Strip

In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ℃/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ℃, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ℃/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ℃, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.     

拉伸载荷作用下AlN夹杂物对航空用超高强度钢中裂纹萌生的影响

 采用扫描电镜原位观测法,跟踪观察了航空用超高强度钢中长方型夹杂物导致裂纹萌生与扩展的微观行为。结果表明,拉伸载荷作用下,航空用超高强度钢中裂纹萌生的方式与夹杂物尺寸及夹杂物周围孔洞的大小有关。当夹杂物面积小于一定值时,无论夹杂物周围有无孔洞,裂纹均以夹杂物/基体界面开裂的方式萌生;当夹杂物面积大于一定值后,若夹杂物/基体界面基本完好,则裂纹易以夹杂物自身开裂的方式萌生;若夹杂物周围孔洞面积较大,则裂纹易以夹杂物/基体界面开裂的方式萌生。     

Effect of Temper Rolling on Tensile Properties of Low-Si Al-Killed Sheet Steel

The tensile properties of steel after temper rolling are affected by the reduction; low-Si Al-killed sheet steel was taken to study the effect of temper rolling on the tensile properties. The results indicate that the yield strength first decreases with the increase of reduction, and then increases. The relationship between the yield strength and the reduction can be expressed using quadratic function. The tensile strength increases with the increase of the reduction, while the total elongation decreases with the increase of the reduction, and the relationship between them and the reduction can be expressed using power function. Under the same condition, the results also indicate that the yield strength and tensile strength of steels across the rolling direction are all larger than those along the rolling direction; there is no obvious distinction between the total elongation along the rolling direction and that across the rolling direction.