共查询到19条相似文献,搜索用时 750 毫秒
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合金元素和控轧控冷工艺在管线钢研制中的应用 总被引:5,自引:0,他引:5
通过在管线钢中添加Mn、Nb、V、Ti和Mo等合金元素与采用控轧控冷工艺可获得良好的微观组织和综合力学性能.具体论述了控轧控冷过程中合金元素和控轧控冷工艺参数对管线铜微观组织和力学性能的影响;同时分析了微合金元素(Nb、V、Ti)碳氮化物的析出行为.结果表明,在适当范围内降低终轧温度和终冷温度,提高轧后冷却速度和增大精轧总变形量都可有效改善钢的综合性能. 相似文献
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《中国新技术新产品》2019,(21)
为了提高该公司低合金高强度H型钢产品的性能,降低生产成本,增强产品的竞争力,提高企业的经济效益和生产效率,通过对该公司生产的低合金高强度H型钢的生产工艺、组织、性能等特点分析,找出了产品性能不合的原因,主要是元素C、Si、Mn、微合金V元素的含量及控轧控冷工艺的影响,在实践中通过采用合理的合金成分设计与控轧控冷工艺相结合,保证低合金高强度H型钢力学性能符合产品标准,产品质量合格。 相似文献
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探索如何生产低成本高强度带肋钢筋,既能满足市场需求又能降低企业的生产成本,具有很重要的实际意义。通过在HRB335钢筋化学成分的基础上适当增加Si、Mn含量,不添加Nb、V、Ti等微合金元素,其开轧温度为1000—1080℃,13#精轧入口温度为950—1050℃,上冷床温度为820—860℃。并采用控轧控冷工艺成功地生产出了力学性能和微观组织均符合要求的HRB400铜筋。本文对控轧控冷工艺如何设置与调整关键的工艺参数进行了分析。 相似文献
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《中国新技术新产品》2021,(12)
该文研究了不同规格42CrMoA钢热轧、轧后控冷与控轧控冷不同工艺条件下钢的金相组织、平均晶粒度与力学性能。研究结果表明不同规格的42CrMoA钢经过控轧控冷后可以有效抑制贝氏体的产生。控制进控制进轧机(KOCKS)的温度为(820±10)℃、上冷床温度(720±10)℃,其晶粒尺寸小于热轧和轧后控温的样品。经过控轧控冷工艺控制后,所有样品的硬度均小于260HB,达到免退火要求。有效地提高和改善棒材的组织和性能。 相似文献
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目的研究大变形量热轧、累积叠轧和普通热轧3种不同加工工艺及后续热处理对AZ31镁合金的组织及室温力学性能的影响。方法将均匀化处理后的AZ31原始样品采用大变形热轧、累积叠轧和普通热轧3种不同加工工艺制备成板材,并进行了后续热处理。利用EBSD技术和力学性能测试,解释了其组织和性能的关系。结果剧烈塑性变形工艺及适宜的热处理工艺,可使AZ31镁合金保持高强度的同时还可兼顾优良的室温延伸率。大变形量热轧工艺制备的AZ31镁合金板材的细晶组织及室温拉伸性能,可与累积叠轧等传统剧烈塑性变形工艺相媲美,屈服强度达到289 MPa,延伸率为7%。结论与普通热轧工艺制得的AZ31镁合金板材相比,大变形量热轧工艺及累积叠轧工艺制得的板材具有更高的强度和塑性。剧烈塑性变形镁合金在低温退火后获得的混晶组织,具有优良的综合力学性能,强度比形变态样品略低,而塑性与完全退火样品相同甚至更好。 相似文献
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The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel has been optimized by the orthogonal experiment with four factors and three levels in this paper.However,the parameters of thermo-mechanical control process(TMCP)optimized by the Gleeble-3500 hot simulator could not satisfy performance requirements of the X100 pipeline steel.In order to improve the performance of this steel,the influence of finish cooling temperature(FCT) on the microstructure and property is studied in detail.It is found that,as this steel is thermo-mechanically treated by this set of parameters(the start heating temperature,finish rolling temperature(FRT),FCT and cooling rate of 1,180℃,810℃,350℃ and 35℃/s,respectively),the microstructures are mainly composed of granular bainite(GB)and acicular ferrite(AF).The effective grain sizes are below 20μm;the steel reaches the optimal balance between the strength and the toughness;the yield strength is 695 MPa;the tensile strength is 768 MPa;the elongation is 16.6%;the impact energy is 262 J at room temperature.All indexes could meet the requirements of X100 pipeline steel. 相似文献
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16Mn钢轧后控制冷却的贝氏体组织与性能 总被引:2,自引:0,他引:2
研究了16Mn钢轧后会冷却工艺对贝氏体组织与性能影响,结果表明,采取适当的控冷工艺所得到细化铁素体和粒状贝氏体组织,可使16Mn钢获得良好手强韧性配合,文中还对16Mn钢轧后控冷所产生的贝氏体组织进行了分析。 相似文献
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《Materials Science & Technology》2013,29(10):1558-1564
AbstractTo further improve the strength and toughness, the advanced thermomechanical controlled processing has been applied in the development of an ultralow C and high Nb bearing steel. In the present investigation, the effects of processing parameters, consisting of the coiling and starting temperatures in non-recrystallisation region, on the final microstructure and mechanical properties of this steel have been studied by tensile, Charpy impact tests, optical microscopy and transmission electron microscopy. Results indicate that the acicular ferrite dominated microstructure can be greatly refined in grain size with decreasing the starting temperature of finishing rolling. However, for high Nb steels, the too low starting temperature would promote the formation of high temperature transformation products and consequently make against the improvement of mechanical properties. In addition, the optimum temperature window of finishing rolling is found to be also related to alloying levels of austenite stabilising elements. At the high starting temperature of finishing rolling, the precipitation strength contribution increases with increasing coiling temperature. However, the increase in strain accumulation associated with low temperature processing greatly reduces the sensitivity of the precipitation strength contribution to coiling temperature. 相似文献
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Yunbo XU Yongmei YU Xianghua LIU Guodong WANGState Key Laboratory of Rolling Technology Automation Northeastern University P.O. Box Shenyang ChinaPh.D. 《材料科学技术学报》2005,21(1):13-16
An integrated metallurgical model was developed to predict microstructure evolution and mechanical properties of low-carbon steel plates produced by TMCP. The metallurgical phenomena occurring during TMCP and mechanical properties were predicted for different process parameters. In the later passes full recrystallization becomes difficult to occur and higher residual strain remains in austenite after rolling. For the reasonable temperature and cooling schedule, yield strength of 30 mm plain carbon steel plate can reach 310 MPa. The first on-line application of prediction and control of microstructure and properties (PCMP) in the medium plate production was achieved. The predictions of the system are in good agreement with measurements. 相似文献
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Xiaochun SHA Chunli MO Dianzhong LI Yiyi LIInstitute of Metal Research Chinese Academy of Sciences Shenyang ChinaShenyang Institute of Technology Shenyang ChinaAnshan Iron Steel Group Corporation Anshan China 《材料科学技术学报》2004,20(5):501-505
Based on hot rolling production line of strip steel, the off-line in-house software, termed as ROLLAN (Rolling Analysis), is developed. The code is mainly used to predict the evolution of temperature, rolling force, fraction and grain size of recrystallization, fraction and grain size of phase transformation and final mechanical properties. Almost all the processing parameters affecting microstructure and mechanical properties in the schedule from reheating to the coiling process are considered in detail. Self-learning coefficient is adopted to adjust the deviation between predicted and measured temperatures, such as roughing exit temperature (RT2), finishing exit temperature (FT7) and coiling temperature (CT). Due to the application of low-speed-threading, increasing-speed-rolling and decreasing-speed-delivery process during finishing rolling and different cooling condition, after coiling the thermal-mechanical history of different position, along strip longitudinal direction is different resulting in 相似文献
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The objective of the study described here is to elucidate the effect of carbon and niobium on the microstructure, precipitation behaviour, and mechanical properties of 0·09C–0·11Ti (%) steel and 0·05C–0·025Nb–0·11Ti (%) steel under ultra fast cooling condition. The strengthening mechanisms are also discussed. The ferrite grains size and the size of precipitates in Ti and Nb–Ti steels were measured respectively. The mechanical properties obtained in Ti steel were similar to Nb–Ti steel with yield stress >700 MPa, elongation >20%, and good low temperature impact toughness. The study underscores that addition of higher carbon content by 0·04% under controlled rolling and ultra fast cooling conditions, we can achieve similar strength in the absence of micro-alloying element, niobium. 相似文献
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结合本钢FTSR薄板坯连铸连轧生产线设备和工艺,开发了薄板坯连铸连轧石油套管专用J55钢。分析了薄板坯连铸连轧工艺与材料组织性能的特点,设计了舍金成分、炼钢工艺和轧钢工艺,进行了现场试生产,检验了产品微观组织和性能。在C—Mn基础上加Nb、Ti微合金化,采用LF+RH的炉外精炼工艺,结合合理的控轧控冷工艺,达到净化钢质、改善夹杂物形态及分布,提高钢材综合力学性能的目的。 相似文献
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Microstructure and mechanical properties of 780 MPa high strength steels produced by direct-quenching and tempering process 总被引:2,自引:0,他引:2
Woong-Seong Chang 《Journal of Materials Science》2002,37(10):1973-1979
Microstructure and mechanical properties of 780 MPa grade steel plate manufactured by conventional reheat-quenching and tempering (RQ-T) and direct-quenching and tempering (DQ-T) processes were investigated. The DQ process was found to enhance the hardenability of steel effectively so that tensile strengths of a range from 780 to 860 MPa have been achieved using DQ-T process, while tensile strength of about 770 MPa has been obtained from the RQ-T sample. In contrast, low temperature toughness of DQ-T samples was generally inferior to that of RQ-T sample, unless hot rolling and cooling processes were optimized in a controlled manner. For example, fracture appearance transition temperature (FATT) of DQ-T samples was varied in a range from –50°C to –120°C, while RQ-T specimens exhibited nearly constant FATT of about –80°C. The finish-rolling temperature (FRT) was one of potential process parameters to determine strength/toughness balance of the steel manufactured by DQ process, while the effect of FRT was closely associated with the cooling rate applied in the process. It has been demonstrated that, for the specimens quenched with a cooling rate higher than 20°C/sec, it may seem to be appropriate to adjust the FRT as low as possible in the non-recrystallization region. In contrast, for the specimens quenched with a low cooling rate of less than 10°C/sec, it may seem to be proper to apply higher FRT to obtain excellent strength/toughness balance of the steel. 相似文献