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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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. The most common reagent for macroetching iron and steel is a 1: The name implies that asstm etched surface is examined visually, or at low magni?
They are usually found in continuously cast or bottom poured products. In highly rectangular product, circular conditions may not be compatible with this rating method. Originally approved in Click here to download full list of asstm.
The atm should be used under a fume hood, or some other means of carrying off the corrosive fumes must be provided. The method employs the action of an acid or other corrosive agent to develop the macrostructural characteristics of a suitably prepared specimen. For ingot cast product, the specimen is usually taken after ingot breakdown.
ASTM E381 – 17
Once cleaned, care should be taken to avoid touching or otherwise contaminating the surface. Dried surfaces may be protected with oil or a transparent lacquer.
The specimen should not be blotted dry. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Macroetch Examinations Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination at low magnifications and rating by a grades series of photographs showing the incidence of certain conditions such as: A freshly made solution is necessary for best results.
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Inspection is most f381 when done while the piece is still wet. The method is limited in application to bars, billets, blooms, and forgings of carbon and low alloy steels. In those cases, circular conditions shall be rated as the average of the maximum length and maximum width of the condition and expressed as a percentage of the square root of the transverse area of the specimen. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM E – 17 Standard Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
Asttm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Current edition approved Oct. Also report the presence of any of the conditions in Plate II. Examination and rating of specimens shall be in accordance with Sections 10 and 11 of this E standard. E — 01 5. Sulfur printing shall be performed in accordance with Practice E Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Wstm.
Billets or blooms going into small sizes are sampled after the initial breakdown.
This brush may have natural vegetable or synthetic? Today, some 12, ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. The best time for examination is immediately after drying. 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.
Adjunct to E Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings – ADJE
Larger disks are etched in corrosionresistant alloy vessels, various types of ceramic pots, rubberlined kettles or wooden tanks. Establishment of general standards for acceptance or rejection for all conditions is impractical as some conditions must be considered relative to the part in which it occurs.
A nickel-molybdenum alloy can be used for containing solutions of sulfuric or hydrochloric acid, or both. Such contact will set up electrolytic galvanic couples and will produce an uneven and misleading etch attack.
The metallurgical engineering team at SGS MSi has the expertise to meet all your material requirements for acid etch processes. After the smut is removed, rinse the specimen under hot running water and blow it dry with compressed air. Establishment of general standards for acceptance or rejection for all conditions is impractical as some conditions must be considered relative to the part in which it occurs.