The current status of vanadium bearing steel and characteristics of different vanadium alloys were analyzed, the effect of different vanadium alloys on V absorption rate and steel properties was investigated, and the varieties of steel properties and V/N ratio under different nitrogen conditions were discussed. It could be concluded that the ferrovanadium should be used mainly in the steel with strict limits on nitrogen content and the ferrovanadium nitride would be preferred in vanadium-nitrogen strengthened steel. The vanadium-nitrogen strengthening can be enhanced with nitrogen-bearing vanadium alloy, which is in favor of cost reduction. The V/N ratio should be in the range of 4 to 6 in commercial production with the optimum ratio of 4.5.
The hot compressive deformation behavior of SWRCH 35K was studied with uniaxial hot compression simulation tests at 923 ~ 1223 K and strain rate of 0.01 ~ 20 /s. The results show that the hot compressive deformation activation energy was 408 kJ/mol and the rang of deformation stored energy was 10 ~ 50 J/mol. The quadratic fitting expression between deformation stored energy and Zener-Hollomon parameter (Z) was established and the deformation stored energy was considered to increased with increasing Z or with lower deformation temperature and increasing deformation rate.
The crack in inclined web of the prestressed concrete continuous girder bridge which is constracted by the way of cast-in-place cantilever method that become one problem that should be more cared about[1-2]. This paper analysis the bridge in three different conditions which are according to the pratical and special engineering to find the causes of the formation of crack in inclined web of prestressed concrete continuous girder bridge in cantilever construction. The results of the analysis show that the additional stress caused by the different temperatures between internal and external components leads to the formation of the crack in inclined web of the bridge.
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