ASTM A53 type e welded steel pipe

ASTM A 53 TYPE E welded pipe is Electric-resistance welded, Grades A and B.
this type pipe is for mechanical and pressure applications and is also acceptable for
ordinary uses in steam, water, gas, and air lines. It is suitable
for welding, and suitable for forming operations involving
coiling, bending, and flanging, subject to the following qualifications.Electric-Resistance-Welded Pipe— A test specimen at
least 4 in. [100 mm] in length shall be flattened cold between
parallel plates in three steps, with the weld located either 0° or
90° from the line of direction of force as required in 9.3.1 or
9.3.2, whichever is applicable. During the first step, which is a
test for ductility of the weld, no cracks or breaks on the inside
or outside surfaces at the weld shall occur until the distance
between the plates is less than two thirds of the specified
diameter of the pipe. As a second step, the flattening shall be
continued as a test for ductility away from the weld. During the
second step, no cracks or breaks on the inside or outside
surfaces away from the weld, except as provided for in 9.7,
shall occur until the distance between the plates is less than one
third of the specified outside diameter of the pipe but is not less
than five times the wall thickness of the pipe. During the third
step, which is a test for soundness, the flattening shall becontinued until the test specimen breaks or the opposite walls
of the pipe meet. Evidence of laminated or unsound material or
of incomplete weld that is revealed by the flattening test shall
be cause for rejection