Light steel keel by use has ceiling keel and partition keel, according to the section form has v type, C type, T type, L type, u type keel. The marking order of light steel keel is: Product name, code, width of section shape, height, thickness of steel plate and standard number.
If the section shape is "C" type, the width is 50mm, the height is 15mm, the steel plate thickness of 1.5mm ceiling keel is marked as: Light steel keel for construction Appearance quality light steel keel shape to be flat, angular clear, incision does not allow to affect the use of burrs and deformation. Galvanized layer is not allowed to have skin, tumor, shedding and other defects. For corrosion, damage, black spots, hemp spots and other defects, according to the prescribed method should be tested in accordance with the provisions of table 2-81. Appearance quality inspection, should be in the product 0.5m from the bright lighting conditions, visual inspection. Light steel keel surface should be galvanized rust-proof, its double-sided galvanizing capacity: excellent products not less than 120g/m*m.