بهترین دوام پس از فروش astm a967
بهترین دوام پس از فروش astm a967; ASTM A967 and AMS 2700 Standards for Passivation. ASTM A967. General industries use this standard to describe and control the passivation of stainless steel. Passivation is a process of making stainless steel more stainless than it would be if left alone. It is based on using an acid (nitric ...