ASTM A384 PDF

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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-. In all cases only the current version of the standard as published by ASTM is to be considered the official document. Designation: A – 76 (Reapproved ) . ASTM A – A M – 02 – Download as PDF File .pdf), Text File .txt) or read online.

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The design and fabrication of the product to be galvanized are the responsibilities of the designer and the fabricator. I the f frame has to be dipped one half at a time, it will be better to have the sheets galvanized, rolled flat after galvanizing, and assembled to the galvanized frame by the use of aluminum alloy or galvanized rivets. Suggested corrections for panel fabrication are detailed.

This is not true of an I-beam, pipe, H-column, or any other section that is symmetrical about both its major axes.

ASTM A384 Recommendations

Therefore, steel thicknesses should vary as little as possible throughout the assembly. Furthermore, cylindrical structures are less likely to warp or distort than rectangular or elliptical ones. A superscript epsilon E indicates an editorial change since the last revision or reapproval.

In welding any intermediate lengths along one side of a common member, care should be taken to prevent warpage of the common member due to the application of high heat on the same side at various intervals along its length. Optimize Welding Before Hot-Dip Galvanizing Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced.

If the angie steel frame and sheets are punched prior to galvanizing the recommended procedurethe use of drift pins to bring the holes into alignment should be avoided as far as possible at the time the sheets and frame are assembled. It is informational only and not an official w384 of the standard; the full text of the standard itself must be referred to for its use x384 application.

Avoid Susceptible Thin Sheet Steels Steel invariably contains internal stresses induced at the mill from qstm operations used to bring structures, plate, and sheet to the final thickness. After galvanizing, these products should be air cooled instead of quenched to minimize induced stress from the cooling cycle. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final thickness. All efforts should be made to keep the stresses in the construction as low as possible right from the beginning to enable the steel to absorb the internal stresses completely.

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Historical Version s – view previous versions of standard.

Practice ASTM A provides guidance on safeguarding against warpage and distortion for optimum hot-dip galvanizing and shall be complied with in both design and fabrication. This will prevent the rusting of the surfaces which are so connected that molten zinc cannot circulate through the crevices to galvanize the contacting surfaces. These rivets can be countersunk a3844 flat head if the protruding head of the ordinary button or round head rivet is objectionable.

Inch pounds and SI units are not necessarily exact equivalents. Factors in Warpage and Distortion 3. When two steels of different thicknesses are assembled and brought up to galvanizing temperature, the thinner steel heats up and expands more quickly than the thicker steel.

ASTM A Recommendations | American Galvanizer’s Association

Additionally, the installation of diagonal members should be performed after galvanizing. This abstract is a brief summary of the referenced standard.

Within the text of this specification and where appropriate, SI units are shown in parentheses. Where excessive cold working or tight bend radii cannot be avoided, the product should be stress relieved per the guidelines provided within ASTM A, Section 6. In nearly every case, regardless of size, channels require straightening after galvanizing. Necessary satm to fabricate properly adtm prepare the material for galvanizing to prevent embrittlement are described in Practice A Oftentimes sheet or plate can be returned to a flattened state using a jig or by weighing the product down on a flat surface during the cool-down.

The overall amount of welding can be minimized by using bolted connections or performing assembly after hot-dip galvanizing. Where welding before galvanizing cannot be avoided, the internal stresses in the connections can be minimized by avoiding joint designs or weld lengths which are greater than statically required, and awtm placing welds atm to and symmetrically around the neutral axis – aligning welds so that shrinkage and opposing forces are balanced rather than all pulling in the same direction.

Your comments are invited either for revision of this sstm or for additional standards and should be addressed to ASTM Headquarters. Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber beams, channels, tees, custom beams, girders because the thermal expansion forces above and below the natural axes balance each other.

Minimize Thick and Thin Material in the Same Assembly When two steels of different thicknesses are assembled and brought up to galvanizing temperature, the thinner steel heats up and aa384 more quickly than the ast steel. Specify symmetrically rolled sections instead of angle or channel frames.

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Thls stendard Is subject to revision at any tlme by the responsible technical commHtee and must be reviewed every five years and H not revised, either reapproved or withdrawn.

A834 following displays various methods to reduce or eliminate the potential for warpage and distortion. The following can cause warpage and distortion: Link to Active This link will always route to the current Active version of the standard.

ASTM does not give any warranty express or implied or make ast representation that the contents of this abstract are accurate, complete or up to date. In the case of sheet metal, the product which has a right-angle bend in the sheet metal itself will remain flatter and be freer from distortion if the aetm of the bend is as large as practicable.

This specification deals with safeguarding against warpage and distortion during hot-dip galvanizing of steel assemblies. Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced.

A w384 in parentheses indicates the year of last reapproval. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting.

Channels and other nonsymmetrical sections should be avoided for the framework of a sheet metal assembly that is to be hot-dip galvanized whenever it is possible to use symmetrical shapes or sections. It is recommended that welding procedures be carried ast in conformancewith the pertinent specificationsof the American Welding Society. A – 76 Reapproved Standard Practice for Safeguarding Against Astn and Distortion During Hot-Dip Galvanizing of Steel Assemblies’ This standard is issued under the fixed designation A ; the number immediately foliowing the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

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Asymmetrical Design Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber beams, channels, tees, custom beams, girders because the thermal expansion forces above and a38 the natural axes balance each other. Originally published as A – 55 T. Current edition approved Oct. Clamps may be applied to prevent shifting or movement during the awtm operation.

Wherever possible, galvanize thick and thin portions separately and join them after galvanizing. Last previous edition A –

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