ASTM A**3 T*1 is the part of ASTM A**3 Standard
Specification for Seamless Ferritic and Austenitic
Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.
ASTM A**3 T*1
ASTM A**3 T*1 Standard covers seamless ferritic and
austenitic steel boiler, superheater, and
heat-exchanger tubes.
Grades containing the letter H in their designation
have requirements different from those of similar
grades not containing the letter H.
These different requirements provide higher
creep-rupture strength than normally achievable in
similar grades without these different requirements.
ASTM A**3 T*1 tubes shall be made by the seamless
process and shall be either hot finished or cold
finished, as specified. Grade TP**7HFG shall be cold
finished. Heat treatment shall be done separately and
in addition to heating for hot forming. The ferritic
alloy and ferritic stainless steels shall be reheated.
On the other hand, austenitic stainless steel tubes
shall be furnished in the heat-treated condition.
Alternatively, immediately after hot forming, while the
temperature of the tubes is not less than the minimum
solution temperature, tubes may be individually
quenched in water or rapidly cooled by other means.
Tension test, hardness test, flattening test, and
flaring test shall be done to each tube. Also, each
tube shall be subjected to the nondestructive electric
test or hydrostatic test.
ASTM A**9 Through A**3
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Other standard specifications include the categories of
A**9 seamless carbon-molybdenum alloy-steel boiler and
superheater tubes; A**0 seamless medium-carbon steel
boiler and superheater tubes and A**3 seamless ferritic
and austenitic steel boiler, superheater and
heat-exchanger tubes. Piping wall thicknesses range
from 1/2 inch to 5 inches. A**3 grades also have the
letter H or M assigned, which changes the composition
and specifications for that series.
This abstract is a brief summary of the referenced
standard. It is informational only and not an official
part of the standard; the full text of the standard
itself must be referred to for its use and application.
ASTM does not give any warranty express or implied or
make any representation that the contents of this
abstract are accurate, complete or up to date.
