Brashicage Need more than one copy? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Standards Subsctiption may be the perfect solution. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Values are also given to specify the range, limit, and maximum chemical compositions of the carbon a You can download and open this file to your own computer but DRM prevents opening a file on another computer, including a networked server.
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Brad Kelechava Leave a comment Steel is not stainless, so stainless steel earns its corrosion-resistant properties through the interaction between its alloying elements and the environment.
Additional assurance that stainless steel will not corrode throughout its anticipated lifespan is given through preparatory processes for the metal, specifically cleaning, descaling, and passivation. In addition to removing contaminants that could detriment the corrosion resistance of the metal, cleaning also helps to achieve a desired appearance. However, since mill products typically are supplied in descaled condition, this process often is not necessary during equipment fabrication or erection of systems.
When it is necessary, it can be performed through one or more methods. For example, chemical descaling, which is also known as pickling, makes use of aqueous solutions of sulfuric acid, or nitric and hydrofluoric acid, molten alkali or salt baths, and various proprietary formulations to remove oxide films.
Please note that while the two are similar, passivation does not encompass the distinct process of descaling. However, descaling may be necessary for passivation to be effective. Acid pickling may also provide sufficient passivation, depending on its specific application. The standard does not cover decontamination or cleaning of equipment or systems that have been in service or descaling and cleaning of materials at the mill.
This document revises and replaces the edition of the same international standard, and it has undergone several changes. Section on total immersion of pickling solution. Section on acid cleaning was revised. Section of water wetting and drying tests for free iron was revised. Added duplex grades to tables. Added low-pressure initial rinse option and reduced scrubbing for degreasing before acid treatment and acid pickling.
Changed time spans to minimums in the table for acid cleaning of stainless steel.
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