给出了需要满足的要求。提供去除污染物和获得适当耐腐蚀性的实用方法。制造过程中要求的表面处理对所有表面都是强制性的。除非规定了表面涂层，否则最终表面处理是强制性的。

Gives the requirements to be met. Provides practical methods for removing contaminants and for obtaining suitable corrosion resistance. The surface treatments required during manufacture are mandatory for all surfaces. The final surface treatments are mandatory except when a surface coating is specified.