A – 01 Standard Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement . There are precautions provided in ASTM A/AM that should be considered to prevent embrittlement, as well as selecting steels with appropriate. 14 Feb ASTM A, Standard Practice for Safeguarding Against Embrittlemnet of Hot- Dip Galvanized Structural Steel Products defines the practice of.
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Active view current version of standard. Open-hearth, basic-oxygen, and electric-furnace steels shall be used for galvanizing.
ASTM International – Standard References for ASTM A / AM – 07()
All fabricated assemblies shall be designed with vent and drain holes such that no air is trapped during immersion of the assemblies into cleaning solutions or molten zinc. This practice covers procedures that can be followed to safeguard against the possible embrittlement of steel hot-dip galvanized after fabrication, and outlines test aastm for detecting embrittlement. Other materials that can be galvanized include continuous cast slabs, steel or iron castings, and wrought iron. A aastm lot size of samples must be tested.
KnowledgeBase What is EN ? Link to Active This link will always route to the current Active version of the standard. Close this window and log in. Embrittlement is the loss or partial loss of ductility in a steel where an embrittled product characteristically fails by fracture without appreciable deformation. It may also be known by its trade name, e. This specification covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process.
This specification covers carbon structural steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes. This abstract is a brief summary of the referenced standard.
Where history has shown that for specific steels, processes and galvanizing procedures have been satisfactory, this history will serve as an indication that no embrittlement problem is to be expected for those steels, processes, and zstm procedures.
Steel materials and nuts shall be manufactured, processed, and formed as appropriate for their respective grades.
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ASTM Specifications | American Galvanizer’s Association
This specification covers prime western grade-recycled PWG-R zinc made by recycling zinc secondary materials including but not limited to drosses and skimmings. Join your peers on the Internet’s largest technical engineering professional community.
Within the text of this practice and where appropriate, SI units are shown in brackets. Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Cold-working of steel prior to galvanizing is the key factor for strain-age embrittlement to develop and the heat in the galvanizing process simply accelerates the recognition of embrittlement.
This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. Embrittlement of steel shapes, steel castings, threaded articles, and hardware items shall be tested using a bend testa universal testing machine, or by means of a press with the load applied slowly, until fracture of the galvanized test specimen occurs.
LME grade, special high grade, high grade, intermediate grade, and prime western grade.
Embrittlement of Hot-dip Galvanized Steel and How to Avoid It
Both areas severely cold-worked steel and steel with ultimate tensile strength greater than ksi may exhibit hydrogen embrittlement due to a tight grain structure trapping hydrogen molecules readily available from the pickling acid used in the galvanizing process. I don’t know if it’s a case of 1 just never having anyone spec A before or 2 I’m just not aware that it took place or 3 it has been spec’d on other jobs but no one paid any attention to the testing part.
Standard Astk for Zinc Hot-Dip Galvanized Coatings on Iron and Steel Products covers individual steel pieces as well as assemblies of various classes of material. Thank you for helping keep Eng-Tips Forums free from a14 posts. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Red Flag This Post Please let us know here why this post is inappropriate.
ASTM A143/A143M – 07(2014)
Students Click Here Join Us! Types of embrittlement commonly encountered with galvanized steel are related to aging phenomena, cold working, and absorption of hydrogen. Within the text of this practice and where appropriate, SI units are shown in brackets. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, vanadium, nickel, chromium, molybdenum, columbium, and copper for the required chemical composition.
Link to Active This link will always route to the current Active version of the standard.
I don’t think it’s number 2 because surely I would have heard about it if someone said, “Hey, we need an extra piece of angle so we can bend it to be sure it doesn’t crack. A also describes how to test for embrittlementessentially by comparing the bending properties of ungalvanized steel to galvanized.
Are you still looking for the right answer? The following can cause warpage and distortion: By joining you are opting in to receive e-mail. Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters. Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life of the galvanized steel.
The specification requirements for coating thickness only contain minimums, there is no maximum coating thickness limitation in the specification.
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. However, if the galvanizer has to perform additional work in order to prepare the product for hot-dip galvanizing, such as drilling holes to facilitate drainage or venting, the galvanizer will communicate and resolve the issue with the customer.