After measurement, when the residual rolling oil on the strip surface is 500mgPm2, of which carbon is 26mgPm2, the degreasing process can be completed when the temperature of the strip steel in the non-oxidizing furnace reaches 450500e, that is, the removal of the strip surface residue is completed in the preheating zone of the non-oxidizing furnace. Things. A post-combustion device is provided at the entrance of the non-oxidizing furnace to discharge the exhaust gas from the furnace and preheat the combustion air. The longer the preheating furnace, the higher the thermal efficiency. It has a great relationship with the temperature of the combustion air. When the air is preheated to 400e, the thermal efficiency of the furnace reaches 49%, the combustion air is preheated to 600e, and the thermal efficiency of the furnace reaches 54. The outlet strip temperature of the direct heating furnace should be limited to 700 to 720e. Semi-bainitic steel has High strength, high toughness, weldability, wear resistance and other characteristics, using China's rich Si, Mn, Mo and other alloying elements, low carbon content in steel, good carburizing, use it to produce high strength gear steel instead of 18Cr2Ni4WA, etc. Steel grades reduce costs and simplify processes. BZ-15C steel is selected from the same carburizing parameters as the carburized steel. The carburizing temperature is 920 to 930e. To prevent grain growth, it is not suitable for high-temperature carburizing. The carburizing and holding time can be determined according to the depth requirement of the infiltration layer, and the steel phase is 18Cr2Ni4WA. In contrast, under the same depth of carburized layer, the carburizing and holding time of BZ-15C steel is prolonged by about 2h. The carburizing cooling method is respectively air-cooled and oil-cooled after 920e4h carburizing. This process is suitable for parts with excessive residual austenite in the infiltrating layer after carburizing air-cooling, making the surface hardness less than HRC58, parts that need to be machined after carburizing, and grain refinement to further increase the penetration layer and the core part. Performance, but more complicated than the process. After the carburizing air cooling of BZ-15C steel, the core structure is quasi-bainite, but the microstructure of the permeation layer is more complicated, the residual austenite gradually decreases from the outside to the inside, and the high-carbon martensite gradually transforms into the martensite and the shellfish. Striatic mixed tissue transition.
the 3D Fence Panel have high stability and longevity.this quality results from the high-quality ral materials and the careful processing with the most modern production techniques.
the surface treatment is galvanized or powder coated.all the Panel Fence
are welded by ourselves' welding machine,and powder coated by ourselves' powder
coating line.
normally the thickness is 4mm or 5mm,we can also produce them as the customer's request.
they used for school play ground,commerical areas,also perfect for sports
grounds,parks,etc.
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