High-building Structural Steel Plate

High-building Structural Steel Plate  is not a completely isotropic material, the use of rolling and forming production process determines the direction of plate in the presence of three different mechanical properties, the best performance along the rolling direction, perpendicular to the rolling direction slightly worse performance, while performance in the thickness direction perpendicular to the rolling direction and inferior performance. Using the general quality of steel produced by steel plates, stratification may occur locally, plate thickness is small chance of such a phenomenon does not appear even lower, but with the plate thickness increases, the possibility of this phenomenon increases, when the plate reaches or exceeds a certain thickness, the plate is almost a partial stratification is difficult to avoid.

Layered plate in the thickness direction to reduce the mechanical properties, welding, or by force after the occurrence of lamellar tearing easily. For this reason, some people are important for building steel plate welded components, in addition to requirements of its length along the width direction and has good mechanical properties, also asked the direction along the thickness of the layer also has good resistance to tearing. The plate is "steel plate thickness characteristics", which is the industry's commonly referred to as "Z to the steel."
"Performance of steel plate thickness" (GB/T5313-1985) is the performance of the direction of plate thickness at the specific request of the national standards. The standard properties of the steel plate along the thickness direction is divided into three levels, were used to grade mark "Z15", "Z25" and "Z35" said. Where "Z" for the thickness properties of the symbol, the subsequent two digits are the levels of steel section shrinkage percentage of the average of three samples. China's "Seismic Design of Buildings" (GB50011-2001) and "Technical Specification for Welding in Steel Building Structures" (JGJ81-2002) were the required thickness greater than 40mm thickness properties of steel should be used.