Development and Preparation of Cold Rolled Steel Strip for High Quality Building Support Formwork
According to the requirements of lightweight,high bearing capacity and long service life proposed by the quality upgrade of steel formwork for building concrete construction,the composition system design of medium carbon,low silicon and medium manganese,plus niobium and titanium micro-alloy is adopted,and the solid solution strengthening of carbon and manganese elements and the precipitation and precipitation strengthening of niobium and titanium elements are fully utilized.The cold-rolled steel strip for the manufacture of building support formwork has been successfully developed by combining the whole process of protective pouring technology,controlled rolling and cooling and cover annealing technology.The obtained annealed steel strip structure is ferritic+point spherical free cementite,yield strength is more than 345 MPa,tensile strength is more than 470 MPa,elongation after breaking is more than 16%,the product on the basis of ensuring strength and toughness,has a good elongation,fully meet the bending and strength requirements of steel formwork manufacturing.The mass preparation of cold-rolled steel strips for high-performance building support structures is realized,which meets the needs of customized services of users,and has strong industrial practice and promotion value.
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