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对四个生产厂家SWRH82B盘条的拉拔情况及钢绞线产品力学性能进行了系统分析,同时分析了各厂家盘条的力学性能、化学成分、微观组织等。分析结果表明,保证SWRH82B盘条化学成分均匀、氮含量控制在45ppm以下、索氏体化率达到92%左右、抗拉强度目标值控制在1180MPa将有利于拉拔和捻股,钢绞线成品性能良好。 相似文献
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介绍SWRH82B盘条的化学成分,在生产中采取加Cr微合金化处理。精轧温度950~990℃,吐丝机温度850~890℃。生产预应力钢绞线用SWRH82B盘条,抗拉强度1150~1240MPa,断面收缩率31~42%。产品性能满足用户使用要求。 相似文献
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利用Gleeble热模拟试验机对宣钢SWRH82B盘条的CCT曲线进行测量绘制,采用金相法进行验证,研究了冷却速度对SWRH82B组织相变的影响。结合宣钢设备现状,确定适用于宣钢Φ12.5 mm规格的SWRH82B盘条生产的控冷工艺为相变前冷速控制为7~10℃/s为宜。 相似文献
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采用热模拟试验机测定了SWRH82B钢(/%:0.80C,0.84Mn,0.22Si,0.013P,0.008S,0.32Cr)的相变点和连续冷却转变(CCT)曲线,通过金相显微镜、SEM、TEM及力学性能测试分析了冷却速度(1~25℃/s)对SWRH82B线材相变组织、珠光体片层间距和力学性能的影响,得到了最佳冷却速度为8~10℃/s;通过150 mm×150 mm SWRH82B钢铸坯轧成Φ13 mm盘条后风冷4组Z1~Z13辊道速度(0.8~1.25 m/s,1.0~1.45 m/s,1.05~1.50 m/s,1.10~1.55 m/s)和冷却速度(8.9,9.5,10.4,11.2℃/s)进行了生产试验,得出在斯泰尔摩风冷线上的获得最佳冷却速度8~10℃/s首段辊道速度应为0.8~1.0 m/s,可达到用户要求的指标:时效后抗拉强度≥1130MPa和断面收缩率≥30%,索氏体率≥80%,表面脱碳深度≤1.5%D(D-线材直径)。 相似文献
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本文论述了影响SWRH82B线材断面收缩率的主要因素,通过控制变形奥氏体的再结晶和长大,提高了轧后线材的断面收缩率。 相似文献
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《钢铁研究学报(英文版)》2014
The law of element segregation of Ti, N, Mn and S, and the sequence of selective precipitation of TiN and MnS inclusions during solidification of molten steel of SWRH82A are studied on the basis of thermodynamics. The origin of large TiN inclusions which affect the titanium inclusions point penalty in SWRH82A wire rod is analyzed based on the research on the distribution characteristics of MnS and large size of TiN inclusions observed on metallographic specimen of SWRH82A steel wire rod. The solidification segregation ratio of Ti is far more than that of N, and the solidification segregation ratio of S is far more than that of Mn. In the range of cooling rate of the continuous casting production, the cooling rate of solidification has little effect on the segregation ratios of Ti, N, Mn and S. MnS inclusions will precipitate earlier than TiN inclusions during solidification of the molten steel of SWRH82A. The large TiN inclusion which is wrapped by MnS in the SWRH82A wire rod may be foreign inclusions and it is not precipitated product during solidification in the molten steel of SWRH82A. 相似文献
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SWRH82B钢主要用于高强度、低松弛预应力混凝土结构用钢丝和钢绞线,要求有良好的塑性。邢钢生产的Φ12.5mm SWRH82B钢(/%:0.79~0.86C,0.15~0.35Si,0.60~0.90Mn,≤0.030P,≤0.030S,0.17~0.50Cr)在拉拔过程中出现异常断裂。对异常断口进行金相分析,发现盘条心部存在明显的网状碳化物,而对应的铸坯中心碳偏析指数为1.16。通过优化280mm×325mm坯连铸工艺,拉速由原0.5m/min提高至0.7m/min,增加轻压下工艺(1~5辊,2mm,3.5mm,3.5mm,4mm,2mm),使铸坯中心碳偏析指数由1.16降至1.08,V形偏析明显改善,盘条断面收缩率由原35%提高至39%,不合格品率显著降低。 相似文献