高强度Q355NHE耐候H型钢的开发  

Research and Development of High Strength Weather-Resisitant H-beam Steel Q355NHE

作　　者：李建中 叶高旗[1] 张玉峰[2] Li Jianzhong;Ye Gaoqi;Zhang Yufeng(Technology Center,Hebei Jinxi Iron&Steel Group Co Ltd.Tangshan 064302;No.2 steel-making plant,Hebei JinxiIron&Steel Group Co Ltd.Tangshan 064302;Long Product Division,Ma'anshan Iron&Steel CoLtd.Ma'anshan 243011)

机构地区：[1]河北津西钢铁集团股份有限公司技术中心,唐山064302 [2]河北津西钢铁集团股份有限公司炼钢二厂,唐山064302 [3]马鞍山钢铁股份有限公司长材事业部,马鞍山243011

出　　处：《特殊钢》2019年第6期46-50,共5页Special Steel

摘　　要：介绍了津西高强度Q355NHE耐候H型钢试制和生产工艺,对生产过程中的关键工序进行了分析和讨论,通过控制成品碳0.06%~0.10%,镍铬当量比(Ni/Cr)0.35~0.45,连铸一冷下降10%,二冷比水量0.70 L/kg左右,稳定连铸浇注周期35~40 min,加热炉在炉时间≤150 min,以及含铌钢的控制轧制等工艺措施,减轻了连铸坯表面凹陷和裂纹,减少了钢中大型C类夹杂物,杜绝了耐候H型钢表面的龟裂缺陷,从而保证-40℃低温冲击功超过标准27 J的要求,平均值为156 J。Research and production process of high strength weather-resisitant H-beam steel Q355 NHE at Jinxi are intrduced in this paper,the key process in production process is analyzed and discussed.By the process measures including to control chemical composition carbon 0.06%~0.10%,nickel chromium ratio(Ni/Cr) 0.35~0.45,water flow of continuous casting mould down by 10%,water ratio of second colling 0.70 L/kg,stable continuous casting cycle 35~40 min,heating time in the furnace less than or equal to 150 min,carried out hot rolling control process of niobium microalloying steel,etc.the surface depress and crack of CC beam-blank and bloom are relievd,amount of large size class C Inclusions in steel is reduced and surface checking of weather-resistant H-beam steel is eliminated to guarantee-40℃low temperature impact energy is more than standard requirement 27 J,average valule is 156 J.

关 键 词：高强度耐候钢H型钢 铸坯表面凹陷 C类夹杂物 含微Nb钢轧制 低温冲击韧性 

分 类 号：TG3[金属学及工艺—金属压力加工]