ASTM A 268/A 268M REV A Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
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ASTM A 268/A 268M REV A Document Information:
Title
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
ASTM International
Publication Date:
Sep 1, 2005
Scope:
(Footnote *)
This specification(Footnote 2) covers a number of grades of
nominal-wall-thickness, stainless steel
tubing for general corrosion-resisting and high-temperature service.
Most of these grades are
commonly known as the "straight-chromium" types and are characterized
by being ferromagnetic. Two
of these grades, TP410 and UNS S 41500 (Table 1), are amenable to
hardening by heat treatment, and
the high-chromium, ferritic alloys are sensitive to notch-brittleness
on slow cooling to ordinary
temperatures. These features should be recognized in the use of these
materials. Grade TP439 is
used primarily for hot-water tank service and does not require
post-weld heat treatment to prevent
attack of the heat affected zone.
An optional supplementary requirement is provided, and when desired,
shall be so stated in the
order.
The values stated in either inch-pound units or SI units are to be
regarded separately as standard.
Within the text, the SI units are shown in brackets. The values stated
in each system are not exact
equivalents; therefore, each system must be used independently of the
other. Combining values from
the two systems may result in nonconformance with the specification.
The inch-pound units shall
apply unless the "M" designation of this specification is specified in
the order.
Footnote * - A Summary of Changes section appears at the end of this
standard.
Footnote 2 - For ASME Boiler and Pressure Vessel Code applications see
related Specification SA-268
in Section II of that Code.
Keywords:
- ferritic stainless steel
- seamless steel tube
- stainless steel tube
- steel tube
- welded steel tube
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