A179a179 PDF
A179a179 PDF
A179a179 PDF
1
A 179/A179M
specification; otherwise all remaining material in the heat or lot diameter and wall thickness which are produced from the same
(Note 2) shall be rejected or, at the option of the producer, each heat of steel. When final heat treatment is in a batch-type
billet or tube may be individually tested for acceptance. Billets furnace, a lot shall include only those tubes of the same size
or tubes which do not meet the requirements of the specifica- and the same heat which are heat treated in the same furnace
tion shall be rejected. charge. When the final heat treatment is in a continuous
furnace, a lot shall include all tubes of the same size and heat,
NOTE 2—A lot consists of 250 tubes.
heat treated in the same furnace at the same temperature, time
10. Hardness Requirements at heat, and furnace speed.
10.1 The tubes shall have a hardness number not exceeding 11.5 Hydrostatic Test—Each tube shall be subjected to the
72 HRB. hydrostatic test, or, instead of this test, a nondestructive electric
test may be used when specified by the purchaser.
11. Mechanical Tests Required
11.1 Flattening Test—One flattening test shall be made on 12. Product Marking
specimens from each of two tubes from each lot (Note 2) or 12.1 In addition to the marking prescribed in Specification
fraction thereof. A 450/A 450M, the marking shall include the name and order
11.2 Flaring Test—One flaring test shall be made on speci- number of the purchaser.
mens from each of two tubes from each lot (Note 2) or fraction
thereof. 13. Keywords
11.3 Flange Test—When specified as a substitute for the 13.1 cold drawn tube; condenser tubes; heat exchanger
flaring test, for tubes having a wall thickness (actual mean tubes; low carbon steel; seamless tube
wall) less than 10 % of the outside diameter, one test shall be
made on specimens from each of two tubes from each lot (Note EXPLANATORY NOTES
2) or fraction thereof. For tubes other than specified above, the NOTE 1—For purposes of design, the following tensile properties may
flange test shall not be required. be assumed:
11.4 Hardness Test—Rockwell hardness tests shall be made Tensile strength, min, ksi [MPa] 47 [325]
on specimens from two tubes from each lot. The term lot Yield strength, min, ksi [MPa] 26 [180]
applies to all tubes, prior to cutting, of the same nominal Elongation in 2 in. or 50 mm, min, % 35
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