高强度厚规格H型钢桩的开发

Development of Thick Specification H-section Steel Pile with High Strength

为满足市场要求,结合异型坯连铸和大型H型钢生产线特点,采用V、N微合金化技术,通过加强冶炼和精炼操作,应用渣洗精炼技术和炉渣改质技术,延长软吹时间,降低了钢中夹杂物含量,通过控制钢水过热度、优化连铸配水,并制定合理的控制轧制制度,细化了铸坯组织和轧材晶粒,成功开发出翼缘厚度达到30.4mm的高强度厚规格H型钢桩。实物质量检测表明,轧材平均屈服强度>460MPa,抗拉强度为582～665MPa,延伸率>18.5%,0℃冲击功平均为107J,满足用户使用要求。

In order to meet market demand, combining the characteristics of CC for the section blank and large scale H sections product line, Using V and N microalloying technology, the thick H steel pile with flange thickness to 30.4 mm and high strength was developed. By strengthening the smelting and refining operation, adopting slag washing refining technology and slag modification technology, extending soft blowing time, the content of inclusions in steel was reduced. By controlling the superheat of liquid steel in continuous casting, optimizing CC water distribution and developing a reasonable rolling control system, the macrostructure of casting blank and the grain of the rolled bar were refined. The test results for the products showed that average yield strength of the roiled bar is greater than 460 MPa, the tensile strength is between 582 MPa and 665 MPa, elongation rate is more than 18.5% and the absorbed-in-fracture energy at 0 ℃ is 107 J, meeting the application requirements of users.