The definition of tensile strength refers to the maximum tensile stress (that is, tensile failure load ÷ cross-sectional area) that the raw material can withstand before tensile fracture.
There are two indicators of yield strength, upper yielding and lower yielding. It is the process in which the stress does not increase and the deformation continues to occur during the stretching process. When the force value drops for the first time, the maximum stress is the yield strength; the yield strength is inevitably smaller than the tensile strength.
value. Non-proportional extension strength: mainly for hard steel without yield point, the residual elongation of the gauge length is 0.2% of the length of the original gauge length is defined as the specified non-proportional extension strength;
and the total extension strength is specified Stress at 0.5%. It is specified in the standard GB/T228.we are galvanized wire suppliers,you can know it.
Tensile strength of galvanized wire: 380-550 N/mm2, elongation: ≥15%.
Two process methods of zinc coating on iron wire are briefly introduced
The protective coating uses a large amount of zinc. At present, there are five processes for zinc coating of iron wire: hot dip galvanizing, electrogalvanizing, zinc galvanizing, zinc powder galvanizing, and mechanical galvanizing. At present, the first two methods are more commonly used, especially hot dip galvanizing is the most widely used.
一、Continuous hot dip galvanizing
A high aluminum zinc coating (55% Al, 45% Zn, a small amount of silicon) and a Galfan coating with a small amount of rare earth added to the Zn-5% Al alloy are a series of continuous coatings, which are widely used. In the case of corrosion resistance, high aluminum zinc coating is generally used (but its plasticity is poor); when plasticity is required, Galfan is selected. If surface quality is required and it is not required to be maintained for a long period of time, zinc plating is generally selected.
The most difficult to handle in general plating is silicon killed steel. Silicon killed steel incorporates silicon during the deoxidation process. This method of adding silicon has a certain influence on hot dip plating. Because the silicon content will affect the thickness, appearance quality and adhesion of the zinc coating of steel products, this is extremely important in the exploration of the potential market of zinc coating. It is currently being studied to add a small amount of nickel to the electroplated steel to eliminate the influence of silicon content. At present, the application of silicon killed steel in different countries is different, such as the United States is used less, in the United Kingdom is more common, France more.