ASTM A - Download as PDF File .pdf), Text File .txt) or read online. ASTM A ASTM A pdf - Download as PDF File .pdf), Text File .txt) or read online. This standard is issued under the fixed designation A/AM; the number 1 This practice is under the jurisdiction of ASTM Committee A05 on Metallic-.
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Sign In · View Account▹ · Home; ASTM A/AM() Add to Cart. Printed Edition + PDF; Immediate download; $; Add to Cart. ASTM A - Designation: A – 01 Standard Practice for Safeguarding Against Embrittlement o. Practice ASTM A provides guidance on safeguarding against warpage and be stress relieved per the guidelines provided within ASTM A, Section 6.
This standard has been approved for use by agencies of the Department of Defense.
Scope 1. Conditions of fabrication may induce a susceptibility to embrittlement in certain steels which can be accelerated by galvanizing. Embrittlement is not a common occurrence, however, and this discussion does not imply that galvanizing increases embrittlement where good fabricating and galvanizing procedures are employed. Where history has shown that for speci? 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.
Terminology 2. An embrittled product characteristically fails by fracture without appreciable deformation. Types of embrittlement usually encountered in galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen. Prepared by Subcommittee A See Proceedings, Am. Testing Mats.
Current edition approved October 10, Published December Originally published as A — 32 T. Last previous edition A — 74 Reapproved Factors in Embrittlement 3. Strain-aging refers to the delayed increase in hardness and strength, and loss of ductility and impact resistance which occur in susceptible steels as a result of the strains induced by cold working. The susceptibility to hydrogen embrittlement is in? In the case of galvanized steel, the acid pickling reaction prior to galvanizing presents a potential source of hydrogen.
However, the heat of the galvanizing bath partially expels hydrogen which may have been absorbed. In practice hydrogen embrittlement of galvanized steel is usually of concern only if the steel exceeds approximately ksi MPa in ultimate tensile strength, or if it has been severely cold worked prior to pickling.
The rate at which this temperature loss of ductility occurs varies for different steels. After cutting, the cut surface 8. Preparation for Galvanizing and ungalvanized samples compared.
If the article withstands 6. The likelihood of this, or of surface 8. Responsibility for Avoiding Embrittlement 7. Wacker Dr.
Suite , Chicago, IL See p. A hole shall be made in the test fracture shall be measured to 0. The dimensional values, diameter, and location ness after fracture, the reduction shall be measured with a of hole shall be not less than those employed in the structural ball-point micrometer at the three locations indicated in Fig.
Care should be taken not to place the hole near stamped namely a, outer side of hole; b, inner side of hole; and c, or rolled-in identification marks. The specimen shall then be middle of leg. The percentage reduction of thickness shall be galvanized. For determining the elongation after fracture, a calculated on the basis of the original thickness of the angle 2-in. The sum of the percentage of elongation plus the slowly, until fracture of the galvanized test specimen occurs.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Cold Working and Thermal Treatment very high strength steel, ultimate tensile strength higher than 6. The abrasive blast hardware, cold bend radii should not be less than that which is cleaning does not generate hydrogen while it is cleaning the proven satisfactory by practice or by the recommendations of surface of the steel.
The flash pickling after abrasive blast the steel manufacturer. These criteria generally depend on the cleaning is used to remove any final traces of blast media direction of grain, strength, and type of steel.
A cold bending before hot-dip galvanizing. Responsibility for Avoiding Embrittlement ensure satisfactory properties in the final product.
Although 8. The fabricator shall If the design requires sharper bending than discussed herein, be responsible for employing suitable fabrication procedures. Testing for Embrittlement of Steel Shapes, Steel 6. Castings, Threaded Articles, and Hardware Items [6. If one test specimen should be found embrittled by shop practice. NOTE 1—A lot is a unit of production from which a sample may be taken for testing.
Unless otherwise agreed upon by the manufacturer and 6. However, if required, proper thermal treatment shall of the same type and size comprising a single order or a single delivery precede galvanizing of the steel. For heavy cold deformation load, whichever is the smaller, or a smaller number of articles identified as exemplified by cold rolling, sheared edges, punched holes, or a lot by the manufacturer, when these have been galvanized within a single production shift.
The length of the test specimen and the distance whichever is less. The galvanized article should withstand a between the supports are shown in the following table: degree of bending substantially the same as the ungalvanized Leg of Angle, l, in. Flaking or spalling of the galvanized coating is not to see Fig. For threaded articles, Up to 4 , incl 14  18  the test shall be made on the unthreaded portion. Over 4 to 6 [ to ], incl 20  24  Over 6 to 8 [ to ], incl 30  36  9.