ASTM A770 PDF

ASTM A STANDARD SPECIFICATION FOR THROUGH-THICKNESS TENSION TESTING OF STEEL PLATES FOR SPECIAL APPLICATIONS. ASTM A A M – Designation: A /AM – 03 Standard Speci? cation for Through-Thicknes. copy of ASTM A is included in Appendix A of this report. In the process of . of a rolled W-shape that is made of ASTM A Grade 50 steel.

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Several types of test specimen shall have specified values of plate thickness, diameter, minimum radius, and length of reduced section. Red Flag This Post Please let us know here why this post is inappropriate.

The more common processes, used singly or in combination, are: A Test Methods and De? Asm your peers on the Internet’s largest technical engineering professional community.

In all cases, the wstm length of the reduced section must be as speci? The tests shall be representative of the plate in its? Because these relationships between the test specimen diameter and the average and variability of the test result have not been satisfactorily quanti?

Alternative test specimen may be used in place of the standard test specimen. Originally approved in The number of tests required will depend upon the thickness of the plate being tested and the reduced section length selected. On the other hand, a reduction in the magnitude and concentration of these inclusions to a low level tends to preclude any easy fracture path along the low ductility inclusions and the steel exhibits improved ductility in a throughthickness direction. Download Now White Paper: It is also accepted that smaller diameter test specimens will tend to astj greater variability to the resulting reduction in area values.

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Two tests shall be required from each quenchedand-tempered plate.

The intent of this speci? Lamellar tearing may also result from loads on the plate surface. Close this window and log in. For Type 3 specimens, locate the weld fusion line of one plate surface within 1? Strains in the through-thickness direction can cause individual inclusions to fractures or decohere from the surrounding steel matrix, thus initiating a void.

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Thank you for helping keep Eng-Tips Forums free from inappropriate posts. For example, those nonmetallic inclusions that form during the solidi? Some of these factors are discussed in X2. For plates over 41? However, A is not clear in scope.

Athough thickness tension test – ASTM (testing materials) Code Issues – Eng-Tips

Below this minimum value, the reduction at the failure point in the reduced section is restrained by the larger cross section away from the reduced section. The number of asmt and test positions have not been established that would provide a good estimate of both the mean and the variability of through-thickness tensile reduction of values of a plate.

For Types 1 and 2 specimens, locate the center of the length of the reduced section at the approximate mid-point of the plate thickness.

Your comments are invited either for revision of this standard or for ast, standards and should be addressed to ASTM International Headquarters.

However, unless the order speci? A superscript epsilon e indicates an editorial change since the last revision or reapproval. The potential variability of the test results also increases the possibility that subsequent testing of a steel plate quali? A minimum slenderness ratio of 2 was selected for the standard Type 2 specimen to allow a 0. For aluminum-silicon killed steels, these inclusions are primarily sul?

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This scatter a707 test results is due in part to the inherent variability of the distribution of the nonmetallic inclusions discussed in X1. The principal purpose of the testing is to provide aastm measure of the resistance of a steel plate to lamellar tearing.

Current edition approved May 10, ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete atm up to date. Register now while it’s still free!

The length of the reduced section Aas shown in Fig. See Test Methods and De? However, lamellar tearing is not solely con? This standard has been approved for use asrm agencies of the Department of Defense.

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ASTM A770/A770M – 03(2012)E1

Further strain can cause the remaining metallic ligaments to shear or rupture, resulting in the step-like fracture appearance.

To improve the through-thickness ductility and thus the resistance of the steel to lamellar tearing, it is necessary to reduce the level of the nonmetallic inclusions.

The tension testing method shall provide a measure of the resistance of a steel plate to lamellar tearing.