Development of Low-temperature Shock Resisting H-beam Q345E Steel Microalloying by Tianium
ZHANG Xuemin
ZHAO Shenggong
Abstract：The Steelmaking Plant of Laiwu Branch Company of Shandong Iron and Steel Co., Ltd. formerly adopted Nb, Ni and B microalloying to produce low-temperature shock resisting H-beam Q345E steel, but the impact property of the products had large fluctuation, low percent of pass and poor benefits. Therefore, producers optimized and adjusted the production processes, adopted low-carbon and Ti microalloying, used passivated magnesium particles desulfurization, used aluminum ferromanganese and aluminum particles deoxidation and protective casting, adjusted rolling process and strengthened the control for each procedure. The absorbed-in fracture energy of developed product at-20℃is between 120 and 160 J/cm2 and at-45℃is between 70 and 100 J/cm2. The qualified rate of finished products is 85%above. The cost reduced by 300 Yuan RMB per ton.
Keywords：H-beamQ345E steeltitanium microalloyinglow temperature impact toughnesscost
Publication Date：2014-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 14-16 )