| ASTM
A-252 |
SPECIFICATIONS
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STANDARD
SPECIFICATION
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ASTM A-252-XX (XX= Represents
year of last revision)
FOUNDATION STEEL PIPE PILES
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SCOPE
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This specification covers nominal thickness
of the wall steel pipe piles of cylindrical
shape and applies to pipe piles in
which the steel cylinder acts as a
permanent load-carrying member, or
as a shell to form cast-in-place concrete
piles.
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STEEL
FABRICATION PROCESS
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The steel shall be made by one or more
of the following processes :
Martin/Bessemer furnace (open-hearth),
basic-oxygen or electric furnace.
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STEEL
CHEMICAL COMPOSITION
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The steel shall conform to the following
requirements as to chemical composition:
Seamless and welded pipe : Martin
furnace, basic-oxygen or electric
furnace:
Phosphorus, maximum (%) : 0.050
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MECHANICAL PROPERTIES
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GRADE
1
GRADE 2
GRADE 3
Yield strength, min.
psi (MPa) :
30,000 (205) 35,000
(240) 45,000
(310)
Tensil strength, min. psi (MPa):
50,000
(345)
60,000 (414)
66,000 (455)
Elongation in 2 in., min. % :
30%
25% 20%
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PERMISSABLE VARIATIONS IN WEIGHTS
AND DIMENSIONS
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Weight
The weight of any length of pile shall
not vary more than 15% over or 5%
under the nominal thickness weight.
Each length shall be weighed separately.
Thickness
The minimum wall thickness at any point
shall not be more than 12.5% under
the nominal wall thickness specified.
Diameter
The outside diameter of steel pipe
piles shall not vary more than ±1%
from the diameter specified.
Length
Length as specified with
a tolerance of ±1².
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WORKMANSHIP,
FINISH, AND APPEARANCE
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The finished pipe piles shall be reasonably
straight and shall not contain imperfections
in such number or of such character
as to render the pipe unsuitable for
pipe piles.
Surface imperfections, the depth of
which does not exceed 25% of the nominal
wall thickness, shall be permitted.
These may be explored by grinding
or filing to establish the depth.
Surface imperfections, the depth of
which exceeds 25% of the nominal wall
thickness shall be considered defects.
Repair of defects by welding will
be permitted when the depth of defect
does not exceed 33 ½ % of the nominal
wall thickness. Before welding the
defect shall be completely removed.
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PIPE
ENDS
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Unless otherwise specified,
material shall be furnished with either
flame or machine cut plain ends. When
ends are specified to be beveled,
they shall be beveled to an angle
of 30°+5°-
0°.
All burrs at the
ends shall be removed.
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NUMBER
OF TESTS
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One tension test
shall be made on one length or fraction
thereof of each size, or one piece of
skelp representing each lot of 200 lengths
or fraction thereof of each size. |
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LENGTHS
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Pipe piles shall be ordered in the
following lengths :
Single random lengths:
- 16 to 25 ft., incl.
Double random lengths :
- over 25 ft. with a minimum average
of 35 ft.
C)
Uniform lenghts : - length
as specified with a tolerance of ±1².
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CERTIFICATION
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Upon request of the purchaser, in the
contract or order, a manufacturer’s
certification that the material was
manufactured and tested in accordance
with this specification together with
a report of the chemical and tensile
tests shall be furnished.
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MARKING
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Each length of pipe pile shall be legibly
marked by stenciling, stamping, or
rolling to show : the name of
the manufacturer; heat number; the
kind of pipe; the size, weight, length,
and wall thickness; and the specification
number and the grade.
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NOTE:
This is a summary of ASTM specifications.
For additional details and information, please
refer to these specifications.
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SPECIFICATION ASTM A-252
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MIN
MECHANICAL PROPERTIES
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STEEL
GRADE
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Tensile
strength ,min Ksi
( Mpa )
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Yield
strength, min Ksi ( Mpa )
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Elongation
in 2 inches
(50mm)% min
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GRADE
1
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50
( 345 )
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30
(205 )
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30
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GRADE
2
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60
( 414 )
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35
( 240 )
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25
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GRADE
3
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66
( 455 )
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45
( 310 )
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20
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