This specification covers seamless and welded highstrength
low-alloy steel pipe NPS ½ to NPS 26, inclusive. Pipe having other
dimensions may be furnished provided such pipe complies with all
other requirements of this specification. This material is intended
for pressure piping service, and other general purposes, where
savings in weight or added durability are important.
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
been substituted in this standard for such traditional terms as
"nominal diameter," "size," and "nominal size."
NOTE 2—A comprehensive listing of standardized pipe dimensions
is contained in ANSI Standard B36.10.
Class—These high-strength low-alloy steels have
enhanced resistance to general atmospheric corrosion by weathering
as commonly encountered in rural, urban, marine, and industrial
environments. They are supplied in two classes: Class 2, having
corrosion resistance equivalent to that of carbon steel with copper
(0.20 minimum Cu); and Class 4, having corrosion resistance
substantially better than that of Class 2 (Note 3). Class 4 steels
when properly exposed to the atmosphere can be used bare
(unpainted) for many applications.
NOTE 3—For methods of estimating the atmospheric corrosion
resistance of low alloy steels see Guide G 101 or actual data.
Type—Pipe may be furnished in the following types of
Type F—Furnace-butt welded, continuous welded,
Type E—Electric-resistance welded, and
Pipe ordered under this specification is suitable for
Type E pipe may be furnished either nonexpanded or cold-expanded
at the option of the manufacturer.
Types F, E, and S pipe are commonly furnished in nonheat-treated
condition. Type S pipe may be furnished in normalized (or other)
heat-treated condition, when so specified.
Types F, E, and S pipe in single random lengths may be furnished
with hot-dipped galvanized coating of zinc, subject to inquiry to
Couplings, when furnished, shall be of the same class,
heat-treated condition, and grade of material as the pipe
Grade—This specification designates eight grades of
steel composition as listed in Table 1 and corresponding tensile
requirements for the grades as listed in Table 2.
For Class 2 pipe, Grade I, II, or III shall be specified, and
copper-bearing steel is required as specified in Table 1.
For Class 4 pipe, Grade IV, V, VI, VII, or VIII shall be
specified. Alternatively, for Class 4, Type S, and Type E pipe, a
steel composition corresponding to a grade listed in Table 1 of
Specification A 588/A 588M may be specified, subject to
When Class 4 pipe is joined by welding or is used in welded
construction, the user is cautioned that the selection of welding
procedure and resultant composition of fused metal should be
suitable for Class 4 material and the intended service.
The values stated in inch-pound units are to be regarded as
standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and
are not considered standard
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