Find the most up-to-date version of ASTM E at Engineering Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination. Contact us. Purchase your copy of ASTM E – 17 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.
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Steels react differently to etching reagents because of variations in chemical composition, method of manufacture, heat treatment and many other variables.
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Development of grain flow in a forged part or fastener, which is a critical property for the integrity of the forging. E Standard Terminology Relating to Metallography.
In highly rectangular product, circular conditions may not be compatible with this rating method. If metal tanks are used, lead is most common for containing sulfuric acid solutions while high-nickel iron or high-silicon iron are preferred to contain hydrochloric acid solutions.
The usual procedure is to take a roughing cut, then a?
Sharp tools are necessary to produce a good specimen. There were no books found for the applied search filters.
When the use of a reagent other than those described in 5. The solution should be swabbed on the? The acids are strong and they can cause serious chemical burns.
ASTM E381 – 17
Establishment of general standards for acceptance or rejection for all conditions is impractical as some conditions must be asgm relative to the part in which it occurs. Torch cutting or other hot cutting will materially affect the structure of the specimen and may be used only when necessary to remove a larger piece prior to cutting to size by cold methods.
Commercial quality hydrochloric acid also known as muriatic acid is satisfactory. Such contact will set up electrolytic galvanic couples and will produce an uneven and misleading etch attack.
These may be located anywhere from the near surface region of the product to the center of the product, depending on the source and severity of the condition.
Disks or specimens are usually cut to reveal a transverse surface, but the requirements of the speci? Any method of preparing smooth surfaces with a minimum amount of cold work should be satisfactory. If the tank is metallic, the disks being etched should not be in contact with each other or with the astj.
Any grease, oil, or other residue will produce an uneven attack and must be removed. Historical Version s – view previous versions of standard. With reductions over a 3: The sectioning of the large specimens should be done so as not to disturb the central portion of the section. Some conditions related to the cast structure for example, chill zone and columnar structure may not be discernible in product which has been reduced by rolling and forging while pattern is only discernible in a wrought specimen.
Sufficient torch cut material should be removed by cold cutting to eliminate the thermal effects of torch cutting. The etching solution should be clear and free from scum.
The etching solution may be reused if it has not become excessively contaminated or weakened. E — 01 It may be necessary to zstm solvents to clean the surface. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Print 1 2 3 4 5 page sstarting from page current page. Establishment of general standards for acceptance or rejection for all conditions is impractical as some conditions must be f381 relative to the part in which it occurs.
The method is limited in application to bars, billets, blooms, and forgings of carbon and low alloy steels. This should be added to an etching bath that is operating at room temperature.
Sulfur printing shall be performed in accordance with Practice E Rating of each condition is accomplished by f381. Originally approved in NOTE 1—The addition of hydrogen peroxide H2O2 may be necessary in order to provide sufficient reaction to properly etch some types of product. E — 01 5. A nickel-molybdenum alloy can be used for containing solutions of sulfuric or hydrochloric acid, or both.