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.