drywall screw size for 1 2 drywall

For example, in gray iron, its carbon exists in iron ore in graphite condition, the crack is often gray, soft and strong, simple filtering, suitable for casting. In white iron, its carbon and iron together into iron carbide, crack appears white, very strong and brittle quality, for the material of malleable steel. The alloy grade consists of various alloying elements with different compositions and structures.

Through drawing molding, pickling rust removal, high temperature annealing, hot dip galvanizing. Cooling and other technological process processing. Galvanized iron wire selection of high quality low carbon steel raw materials, after drawing, galvanized and other processes. With galvanized layer, strong corrosion resistance, galvanized layer strong characteristics, electric galvanized iron wire is widely used in construction, highway fence, tie, weaving and other industries.

Second, composition. Model 201 is composed of 17Cr-4.5Ni-6Mn-N, which is a substitute steel for type 301 steel. Anping wire rolling cage is magnetic after cold working, used in railway cars. 304 composition of 18Cr-9Ni, is the most widely used stainless steel, heat resistant steel. Used for food production equipment, Xitong chemical equipment, nuclear energy, etc.

A. When the thickness of the plating is 3-4 mm, the zinc adhesion should be less than 460g/m, that is, the average thickness of the zinc layer is not less than 65 microns.

Cold galvanizing (galvanizing) is in the plating tank after the current unidirectional, so that the zinc gradually plated on the metal surface, slow production speed, uniform coating, thin thickness, usually as long as 3-15g, bright appearance, poor corrosion resistance, usually a few months will rust. Compared with hot dip galvanizing, the production cost of electric galvanizing is lower.