轧制与冷却工艺对X65薄规格管线钢组织与性能的影响  

Influence of Rolling and Cooling Process on the Microstructure and Properties of Thin Gauge X65 Pipeline Steel

作　　者：董福全 黄少文[1] 霍孝新[1] 张敏[1] 

机构地区：[1]莱芜钢铁集团有限公司,山东莱芜271104

出　　处：《山东冶金》2012年第4期30-33,共4页Shandong Metallurgy

摘　　要：系统研究了控轧及控轧控冷工艺对9.5mm薄规格X65管线钢组织和性能的影响。结果表明:控轧控冷生产的钢的强度、韧性及微观组织整体优于控轧型X65管线钢。对于控轧工艺,降低轧制温度,晶粒细化,强度提高至550MPa,屈强比有增大趋势(0.90～0.95),但韧性较差;轧后配合水冷,通过优化冷却温度和精轧开轧厚度,组织明显细化,混晶程度和带状组织均改善,强度提高至580～620MPa,-20℃冲击韧性稳定在130～150J,屈强比稳定在0.83～0.9。无论是控轧工艺还是控轧控冷工艺,仅通过降低轧制温度、冷却温度对钢的强度提高幅度有限。This article systematically studied the influences of controlled rolling （CR） process and controlled rolling and controlled cooling （CR＋CC） processes on the microstructure and properties of 9.5 mm thin gauge X65 pipeline steel. The results are as follows： the mechanical properties and microstructure of the X65 produced by CR＋CC are better than that by CR; For the CR X65 steel, with decreasing the rolling temperature, the grain became finer, the strength increased to 550 MPa and the yield ratio had increase trend （0.90-0.95）, but the toughness was poorer; For the CR＋CC X65 steel, by optimizing the cooling temperature and finishing rolling thickness, the microstructure became refining remarkably, the degrees of the mixed grain structures and banded structure were improved, the strength increased to 580-620 MPa, the toughness was stable in 130-150 J at -20 C and the yield ratio was stable in 0.83-0.9. However, for the CR or the CR＋CC process, only by reducing the roiling temperature and cooling temperature can not excessively increase the strength.

关 键 词：X65管线钢 薄规格 控轧控冷 组织 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]