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Description / Abstract:
This specification covers three Types and two Grades of cold
formed electric-fusion (arc) welded high-strength lowalloy steel
tubing of 50 ksi [345 MPa] minimum yield point for use in welded or
bolted construction of buildings and for general structural
purposes.
This tubing is produced in square and rectangular sizes with a
periphery of 200 in. [500 cm] or less and a specified wall
thickness of 1.00 in. [25 mm] or less. Tubes are joined by two
ngitudinal electric-fusion (arc) welds. Circumferential welds are
disallowed. Sizes outside of those listed in Tables 4 and 5 may be
ordered provided all other requirements of the specification are
met. Typical lengths are 15 to 50 ft. [5 to 15 m].
NOTE 1—Products manufactured to this specification may not be
suitable for those applications such as dynamically loaded elements
in welded structures, etc. where low-temperature toughness
properties may be important. (See Supplementary Requirement
S1.)
This specification covers the following Types:
Type 1—Welded with backing, backing left in the
product,
Type 2—Welded with backing, backing removed,
Type 3—Welded without backing.
Tubing is available in Grades 50 [345] and 50W [345W]. Grade 50
[345] is manufactured from high-strength low-alloy steel. Grade 50W
[345W] is manufactured from high-strength low-alloy steel with
enhanced atmospheric corrosion resistance. (See 10.1.2) The Grades
may not be interchanged without approval of the purchaser. ASTM
Specifications for plate that may be applied to Grade 50 [345] and
50W [345W] are listed in Reference Documents and in Table 1.
This specification is expressed in both inch-pound units and in
SI units; however, unless the purchase order or contract specifies
the applicable M specification designation (SI units), the
inch-pound units shall apply. The values stated in either SI units
or inch-pound units are to be regarded separately as standard.
Within the text, the SI units are shown in brackets. The values
stated in each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining values
from the two systems may result in nonconformance with the
standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.