Q355BZ15 steel plate is a "Lamellar Tearing resistant Steel", which is commonly referred to as a Z-axis test steel. Compared with Q355B low alloy plate in the direction of thickness increased the resistance to lamellar tearing performance, now a lot of steel structure manufacturing standards have gradually replaced Q355B low alloy plate. Q355BZ15 is used in large and medium-sized, large-span structure buildings, stadiums, exhibition centers, high-rise buildings and other fields. Its superior performance is also reflected incisively and vividly.
Z25, Z35 steel plate with higher performance, different yield strength such as :Q390,Q420,Q460 and other materials behind according to the requirements of the Z performance. Z - direction plate is used to prevent laminar tearing of the plate, the main joint of the plate if the plate in the direction of the plate thickness under significant tensile stress plate. Steel plate and section steel after rolling molding, general high-rise steel structure used for hot rolling molding, hot rolling can destroy the casting structure of steel ingot, refine the grain of steel. The bubbles and cracks formed during the pouring of ingot can be welded together under high temperature and pressure, thus improving the mechanical properties of steel. However, this improvement is mainly reflected in the rolling direction, because the non-metallic inclusions in the steel (mainly sulfide, oxide, silicate, etc.) are pressed into thin sections after rolling, and still remain in the steel plate (generally parallel to the surface of the steel plate), and the steel plate appears stratified (interlayer) phenomenon. This phenomenon of non-metallic interlayer. Deteriorate the tensile properties of steel along the thickness direction. So the mechanical properties of the steel plate in three directions are different: along the rolling direction is good; The performance perpendicular to the rolling direction is slightly worse; Along the thickness direction performance is next.
