ASTM B491/B491M-15
Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications

Standard No.
ASTM B491/B491M-15
Release Date
2015
Published By
American Society for Testing and Materials (ASTM)
Status
Replace By
ASTM B491/B491M-23
Latest
ASTM B491/B491M-23
Scope

1.1 This specification covers aluminum and aluminum-alloy extruded round tubes either in coils or straight lengths, for general purpose applications such as refrigeration service, gas lines, oil lines, and instrument lines, in the alloys (Note 2) and tempers shown in Table 2 [Table 3], in outside diameters of 0.250 through 0.750 in. [6.00 through 20.008201;mm]. For diameters over 0.500 through 0.750 in. [over 12.50 through 20.008201;mm], the diameter and wall-thickness tolerances and eddy-current test parameters, if required, shall be agreed upon by the producer and the purchaser. Only tubes in aluminum 1200-H111 and 1235-H111 are sized after extrusion to minimize ovalness.

(A) Limits are in percent maximum unless shown as a range or otherwise stated.
(B) Analysis shall be made for the elements for which limits are shown in this table.
(C) For purposes of determining conformance to these limits, an observed value or a calculated value attained from analysis shall be rounded off to the nearest unit in the last right-hand place of figures used in expressing the specified limit, in accordance with the rounding method of Practice E29.
(D) Others includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samples for trace elements not specified in the specification. However, such analysis is not required and may not cover all metallic Others elements. Should any analysis by the producer or the purchaser establish that an Others element exceeds the limit of Each or that the aggregate of several Others elements exceeds the limit of Total, the material shall be considered nonconforming.
(E) Other Elements—Total shall be the sum of unspecified metallic elements 0.0108201;% or more, rounded to the second decimal before determining the sum.
(F) The aluminum content shall be calculated by subtracting from 100.008201;% the sum of all metallic elements present in amounts of 0.0108201;% or more each, rounded to the second decimal before determining the sum.
(G) Vanadium 0.05%, maximum.