Abstract: Research and production process of high strength weather-resisitant H-beam steel Q355NHE at Jinxi are in- trduced 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 value is 156 J.

Key words: High Strength Weather-Resisitant H-beam Steel, Surface Depress of CC Beam-Blank and Bloom, Class C Inclusions,Rolling of Nb Microalloying Steel, Impact Toughness at Low Temperature ,

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27J的要求,平均值为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