高硅管线钢K52组织性能研究  

Microstructure and Mechanical Properties of Study of Microstructure and Mechanical Properties of High Silicon Pipeline Steel K52

作　　者：安成钢 牛涛 吴新朗[2] 代晓莉 于晨[2] 张彩霞[2] 

机构地区：[1]首钢集团有限公司技术研究院 [2]首钢股份公司迁安钢铁公司 [3]绿色可循环钢铁流程北京市重点实验室

出　　处：《首钢科技》2017年第6期6-11,共6页Shougang Science and Technology

摘　　要：对比研究了屈服强度相近的俄标高硅管线钢K52和管线钢X52的组织性能。结果表明，高硅管线钢K52要求高硅低锰的成分体系，且抗拉强度、屈强比和低温冲击韧性上要求更高。通过成分的优化设计，适量添加铌、钒和钛等微合金元素，并降低卷取温度，实现细化晶粒提高强韧性的目的，成功开发了高硅管线钢K52。由于管线钢K52高硅低锰的成分体系，热轧过程中其氧化铁皮较为严重，较低的出炉温度可以减少氧化铁皮厚度。高硅管线钢K52在焊接过程中易产生含硅氧化物夹杂物，对焊缝冲击韧性造成不利影响，可以通过增大挤压量的方法解决。The microstructure and mechanical properties of high silicon pipeline steel K52 and AP1 X52, which were with similar yield strength, were studied comparatively. The results showed that the standard of high silicon pipeline steel K52 with high silicon and low manganese composition system required higher tensile strength, lower yield ratio and higher low temperature impact toughness than API X52. High silicon pipeline steel K52 was successfully developed through optimizing the composition design, properly adding microalloying elements such as niobium, vanadium and titanium, and reducing the coiling temperature to refine the grains and improve the strength and toughness. Due to the high silicon and low manganese composition system of pipeline steel K52, the oxide scale was serious during hot rolling and the lower reheating temperature could reduce the thickness of the scale. The siliceous oxide inclusions were formed during the welding process, which had an adverse effect on the impact toughness of the welding seam, and could be solved by increasing the amount of extrusion.

关 键 词：K52 高硅含量 管线钢 氧化铁皮 

分 类 号：TG146.21[一般工业技术—材料科学与工程]