Hi,
Manufacturer PQR Test results of 25 Cr 35 Ni to SA 479 TYP 304H - furnace tubes Tensile test of the 13 mm thick specimen results in 2.67 % & 3.7 % elongation Bend test (As per ASME IX) failed at the HAZ. Manufacturer has followed ASTM A 488 "Standard specifications for steel castings, Welding, Qualification of procedures and personnel" to qualify the procedure. Question 1. Is the PQR qualified if QW-466.19 [General notes (E)] is followed?.
"QW-466.19 - For material with less than 3 % elongation, a macro etch specimen shall be used in lieu of bend test at each bend location. Acceptance criteria shall be in accordance with QW-183(a)". 2. Can ASTM A 488-8.2.4 be followed to qualify a procedure? "ASTM A 488-8.2.4 – Where the ductility of the parent metal is such as to render it incapable of meeting the bend test requirements, the bend test shall be conducted in the following manner: A bend bar comprised of parent metal heat treated to the ductility & strength requirements of the applicable specifications shall be bent to failure. The side bend specimen shall be then capable of being bent to within 5° of the angle thus determined." |
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