High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process

SU Cheng1,2,DONG Fang2

Iron and Steel ›› 2012, Vol. 47 ›› Issue (8) : 65-69.

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Iron and Steel ›› 2012, Vol. 47 ›› Issue (8) : 65-69.
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High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process

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Abstract

The high temperature plasticity of micro-alloyed Q345B structural steel containing V, Ti and Nb was investigated. The tensile test was carried out by Gleeble-1500D thermal simulation testing machine, and fracture strength and reduction of area with temperature was analyzed under the condition of strain rate 1.5×10-3s-1 and deformation temperature 700-1300℃(Δt=100℃). The results show that Q345B structural steel exists two brittle zones, the first temperature area (Ⅰ) of brittless is solidification temperature about 1300℃, the third temperature area (Ⅲ) of brittless is 850-740℃. Through observation of fracture morphology and microstructure by scanning electron microscopy and optical microscopy, the cause of fracture was cleared to provide the theoretical guidance for the actual continuous casting process.

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XIU Cheng. High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process[J]. Iron and Steel, 2012, 47(8): 65-69

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