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A 53/A 53M — 06a
<br /> 5. Chemical Composition a cylindrical mandrel,the diameter of which is twelve times the
<br /> 5.1 The steel shall conform to the requirements as to specified outside diameter of the pipe, without developing
<br /> chemical composition given in Table I and the chemical cracks at any portion and without opening the weld.
<br /> analysis shall be in accordance with Test Methods, Practices, 7.2.2 if ordered for close coiling, the pipe shall stand being
<br /> and Terminology A 751. bent cold through 180° around a cylindrical mandrel, the
<br /> diameter of which is eight times the specified outside diameter
<br /> 6. Product Analysis of the pipe, without failure.
<br /> 6.1 The purchaser is permitted to perform an analysis of two 7.2.3 Double-extra-strong pipe over NPS 11/4 [DN 321 need
<br /> pipes from each lot of 500 lengths,or fraction thereof.Samples not be subjected to the bend rest.
<br /> for chemical analysis,except for spectrographic analysis,shall 7.3 Flattening Test:
<br /> be taken in accordance with Practice E 1806. The chemical 7.3.1 The flattening test shall be made on welded pipe over
<br /> composition thus determined shall conform to the requirements NPS 2 [DN 50] in extra-strong weight or lighter.
<br /> given in Table I. 7.3.2 Seamless Pipe:
<br /> 6.2 if the analysis of either pipe does not conform to the 7.3.2.1 Although testing is not required, pipe shall be
<br /> requirements given in Table I, analyses shall be made on capable of meeting the flattening test requirements of Supple-
<br /> additional pipes of double the original number from the same mentary Requirement S1, if tested.
<br /> lot,each of which shall conform to the specified requirements. 7.3.3 Electric-Resistance-Welded Pipe:
<br /> 7. Mechanical Properties 7.3.3.1 A test specimen at least 4 in. 1100 mm] in length
<br /> shall be flattened cold between parallel plates in three steps,
<br /> 7.1 Tension Test: with the weld located either 0°or 90e from the line of direction
<br /> 7.1.1 For tension tests other than transverse weld tension of force as required by 7.3.3.2 or 73.3.3, whichever is
<br /> tests,the yield strength corresponding to a permanent offset of applicable. During the first step,which is a test for ductility of
<br /> 0.2%of the gage length or to an extension of 0.5%of the gage the weld,except as allowed by 7.3.5,7.3.6,and 7.3.7,no cracks
<br /> length under toad, the tensile strength,and the elongation in 2 or breaks on the inside or outside surface at the weld shall be
<br /> in. or 50 mm shall be determined, and the tension test results present before the distance between the plates is less than two
<br /> shall conform to the applicable tensile property requirements thirds of the specified outside diameter of the pipe.As a second
<br /> given in Table 2. step, the flattening shall be continued as a test for ductility
<br /> 7.1.2 For transverse weld tension tests, the tensile strength away from the weld.During the second step,except as allowed
<br /> shall be determined, and the tension test results shall conform by 7.3.6 and 7.3.7,no cracks or breaks on the inside or outside
<br /> to the applicable tensile strength requirement given in Table 2. surface away from the weld shall be present before the distance
<br /> 7.1.3 Electric-resistance-welded pipe NPS 8 [DN 2001 or between the plates is less than one third of the specified outside
<br /> larger shall be tested using two transverse test specimens, one diameter of the pipe but is not less than five times the specified
<br /> taken across the weld and one taken opposite the weld. wall thickness of the pipe.During the third step,which is a test
<br /> 7.1.4 Transverse tension test specimens shall be approxi- for soundness, the flattening shall be continued until the test
<br /> mately 11/ in. [38 mm] wide in the gage length and shall specimen breaks or the opposite walls of the test specimen
<br /> represent the full wall thickness of the pipe from which the test meet.Evidence of laminated or unsound material or of incom-
<br /> specimens were cut. plete weld that is revealed by the flattening test shall be cause
<br /> 7.2 Bend Test: for rejection.
<br /> 7.2.1 For pipe NPS 2[DN 501 or smaller,a sufficient length 73.3.2 For pipe produced in single lengths, the flattening
<br /> of pipe shall be capable of being bent cold through 900 around test specified in 7.3.3.1 shall be [Wade using a test specimen
<br /> taken from each end of each length of pipe.The tests from each
<br /> TABLE 2 Tensile Requirements end shall be made alternately with the weld at 00 and at 900
<br /> Grade A Grade B from the line of direction of force.
<br /> Tensile strength,Iran,psi[MPaI 48 000[33111 60 000 14151 7.3.3.3 For pipe produced in multiple lengths,the flattening
<br /> Yield strength.min,psi[MPaI 30 00012051 35 000(2401 test specified in 7.3.3.1 shall be made as follows:
<br /> Elongation in 2 in.or 50 mm A.& A's
<br /> (1) Test specimens taken From, and representative of, the
<br /> "The minimum elongation in 2 in. [50 mml shall be that determined by the front end of the first pipe intended to be supplied from each
<br /> following equation: e=625 000 179401 A 0.z/U coil,the back end of the last pipe intended to be supplied from
<br /> each coil,and each side of any intermediate weld stop location
<br /> where: shall be flattened with the weld located at 900 from the line of
<br /> e = minimum elongation in 2 in.or 50 mm in percent,rounded to the nearest
<br /> percent direction of force.
<br /> A = the lesser of 0.75 in.2 1500 mrrtvl and the omsssectionai area of the (2) Test specimens taken from pipe at any two locations
<br /> tension test specimen,calculated using the specified outside diameter of Intermediate to the front end of the first pipe and the back end
<br /> the pipe, or Me nominal width of the tension test specimen and the
<br /> specified wan thickness of the pipe,with the calculated value rounded to of the last pipe intended to be supplied from each coil shall be
<br /> the nearest 0.01 in.'[1 mm2],and flattened with the weld located at 00 from the line of direction
<br /> U = specified minimum tensile strength,psi(MPa). of force.
<br /> 9 See Table X4.1 or Table X4.2, whichever is applicable, for the minimum 73.3.4 For pipe that is to be subsequently reheated through-
<br /> ebngation values that are required for various combinations of tension test
<br /> specimen sae and specified minimum tensile strength. out its cross section and hot formed by a reducing process,the
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