Method for modifying and thereby improving the corrosion resistance and hardness of workpieces of ferritic steel

摘要

The invention relates to a method for making workpieces of ferritic steel, such as drilling screws wherein the workpiece is made of a transformable chrome steel having a chrome percentage of at least 13%, whereupon a workpiece receives a coating from nickel or a nickel or cobald alloy having a thickness of at least 5 mu m, and subsequently the workpiece is heat treated under oxygen free environment at at least 850 DEG C. so as to obtain a desired hardness and corrosion resistance.