ASTM A523-96(2001)
(Specification)Standard Specification for Plain End Seamless and Electric-Resistance-Welded Steel Pipe for High-Pressure Pipe-Type Cable Circuits
Standard Specification for Plain End Seamless and Electric-Resistance-Welded Steel Pipe for High-Pressure Pipe-Type Cable Circuits
SCOPE
1.1 This specification covers seamless and electric-resistance-welded steel pipe used as conduit for the installation of high-pressure pipe-type electrical cables in NPS 4 to NPS 12, inclusive, with nominal (average) wall thicknesses 0.219 to 0.562 in., depending on size. Pipe having other dimensions (Note 2) may be furnished, provided such pipe complies with all other requirements of this specification.
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 B36.10.
1.2 Pipe ordered under this specification is suitable for welding and for forming operations involving flaring, belling, and bending.
1.3 Pipe for this purpose shall be furnished in Grade A or Grade B as specified in the purchase order. Grade A is more suitable for forming operations involving bending, flaring, or belling and this grade is normally preferred. This provision is not intended to prohibit the cold bending, flaring, or belling of Grade B pipe.
1.4 The values stated in inch-pound units are to be regarded as the standard.
1.5 The following hazard caveat applies to the test method portion, Section 20, of this specification: This standard does not purport to address all of the safety problems, 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.
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Designation: A 523 – 96 (Reapproved 2001)
Standard Specification for
Plain End Seamless and Electric-Resistance-Welded Steel
Pipe for High-Pressure Pipe-Type Cable Circuits
This standard is issued under the fixed designation A523; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope A370 TestMethodsandDefinitionsforMechanicalTesting
of Steel Products
1.1 This specification covers seamless and electric-
A 751 Test Methods, Practices, and Terminology for
resistance-weldedsteelpipeusedasconduitfortheinstallation
Chemical Analysis of Steel Products
of high-pressure pipe-type electrical cables in NPS 4 to NPS
E59 Method of Sampling Steel and Iron for Determination
12,inclusive,withnominal(average)wallthicknesses0.219to
of Chemical Composition
0.562 in., depending on size. Pipe having other dimensions
2.2 ANSI Standard:
(Note 2) may be furnished, provided such pipe complies with
B36.10 Welded and Seamless Wrought Steel Pipe
all other requirements of this specification.
NOTE 1—The dimensionless designator NPS (nominal pipe size) has 3. Ordering Information
been substituted in this standard for such traditional terms as “nominal
3.1 Orders for material under this specification should
diameter,” “size,” and “nominal size.”
include the following, as required, to describe the desired
NOTE 2—A comprehensive listing of standardized pipe dimensions is
material adequately:
contained in ANSI B36.10.
3.1.1 Quantity (feet or number of lengths),
1.2 Pipe ordered under this specification is suitable for
3.1.2 Name of material (steel pipe),
welding and for forming operations involving flaring, belling,
3.1.3 Method of manufacture (seamless or electric-
and bending.
resistance-welded),
1.3 Pipe for this purpose shall be furnished in Grade A or
3.1.4 Grade (Table 1),
Grade B as specified in the purchase order. Grade A is more
3.1.5 Size (outside diameter and nominal wall thickness or
suitable for forming operations involving bending, flaring, or
weight per foot),
belling and this grade is normally preferred. This provision is
3.1.6 Length when other than specified in Section 13,
not intended to prohibit the cold bending, flaring, or belling of
3.1.7 End finish (Section 16),
Grade B pipe.
3.1.8 Skelp for tension tests, if permitted 20.2,
1.4 The values stated in inch-pound units are to be regarded
3.1.9 When mill applied coating is required (Section 10),
as the standard.
and
1.5 The following hazard caveat applies to the test method
3.1.10 ASTM specification number.
portion, Section 20, of this specification: This standard does
not purport to address all of the safety concerns, if any,
4. Process
associatedwithitsuse.Itistheresponsibilityoftheuserofthis
4.1 Thesteelshallbemadebyoneormoreofthefollowing
standard to establish appropriate safety and health practices
processes: open-hearth, basic-oxygen, or electric-furnace.
and determine the applicability of regulatory limitations prior
4.2 Steel may be cast in ingots or may be strand cast.When
to use.
steels of different grades are sequentially strand cast, identifi-
cation of the resultant transition material is required. The
2. Referenced Documents
producer shall remove the transition material by any estab-
2.1 ASTM Standards:
lished procedure that positively separates the grades.
5. Chemical Composition
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
5.1 The steel shall conform to the requirements as to
StainlessSteel,andRelatedAlloys,andisthedirectresponsibilityofSubcommittee
A01.09 on Carbon Steel Tubular Products. chemical composition prescribed in Table 2 and the chemical
Current edition approved Oct. 10, 1996. Published November 1997. Originally
published as A523–64. Last previous edition A523–93.
This specification was initiated by the IEEE Insulated Conductors Committee in Annual Book of ASTM Standards, Vol 01.03.
recognition of the need for a specification embodying the special requirements of Annual Book of ASTM Standards, Vol 03.05.
pipeforhigh-voltageelectricalcircuits.ItwaspreparedforacceptanceasanASTM Available fromAmerican National Standards Institute, 11 West 42nd St., 13th
specification by a task group of Subcommittee A01.09 of ASTM Committee A-1. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 523 – 96 (2001)
TABLE 1 Tensile Requirements
7. Product Analysis
Grade A Grade B
7.1 Whenspecifiedinthepurchaseorder,aproductanalysis
Tensile strength, min, ksi (MPa) 48 (330) 60 (415)
report shall be furnished by the manufacturer on two pipes
Yield strength, min, ksi (MPa) 30 (205) 35 (240)
from each lot of 400 lengths, or fraction thereof, of 4 ⁄2-in.
Elongation in 2 in. or 50 mm, %:
Basic minimum elongation for walls ⁄16 in. (7.94 35 30 outside diameter and 5 ⁄16-in. outside diameter sizes and from
mm) and over in thickness, longitudinal strip
each lot of 200 lengths, or fraction thereof, of each size 6 ⁄8-in.
tests, and for small sizes tested in full section.
outside diameter through 12 ⁄4-in. outside diameter pipe.
When standard round 2-in. or 50-mm gage length 28 22
test specimen is used Samples for chemical analysis, except for spectrographic
A A
For longitudinal strip tests, the width of the gage 1.75 1.50
analysis, shall be taken in accordance with Method E59. The
section shall be 1 ⁄2 in. (38.1 mm) and a
1 chemical composition thus determined shall conform to the
deduction for each ⁄32in. (0.79 mm) decrease in
wall thickness below ⁄16 in. (7.94 mm) from the
requirements specified in Section 5.
basic minimum elongation of the following
7.2 Product Analysis Retests—If both lengths of pipe rep-
percentage points
resentingthelotfailthespecifiedproductanalysis,thelotshall
A B
The following table gives the minimum computed values:
be rejected, or at the option of the manufacturer, all of the
remaining lengths of the lot shall be tested individually for
Wall Thickness Elongation in 2 in. or 50
conformance to the specified requirements. If only one of the
mm, min, %
lengths of pipe representing the lot fails the specified check
in. mm Grade A Grade B
analysis, the lot shall be rejected or, at the option of the
⁄16 (0.312) 7.94 35.0 30.0
manufacturer, two retest analyses shall be made on two
⁄32 (0.281) 7.14 33.2 28.5
1 additional lengths selected from the same lot. If both of these
⁄4 (0.250) 6.35 31.5 27.0
⁄32 (0.219) 5.56 29.8 25.5
retest analyses conform to the specified requirements, the lot
⁄16 (0.188) 4.76 28.0 24.0
shall be accepted except for the length which failed on the
⁄32 (0.156) 3.97 26.2 22.5
initial analysis. If one or both of the retest analyses fail the
⁄8 (0.125) 3.18 24.5 21.0
⁄32 (0.094) 2.38 22.8 19.5
specifiedrequirements,theentirelotshallberejected,or,atthe
⁄16 (0.062) 1.59 21.0 18.0
optionofthemanufacturer,eachoftheremaininglengthsshall
B
This table gives the computed minimum elongation values for each ⁄32 in. betestedindividually.Onlyanalysisoftherejectingelementor
(0.79 mm) decrease in wall thickness. Where the wall thickness lies between two
elements is necessary in checking the remaining lengths.
values shown above, the minimum elongation value shall be determined by the
following equation:
8. Tensile Requirements
Grade Equation
A E=56t + 17.50 8.1 The material shall conform to the requirements as to
B E=48t + 15.00
tensile properties prescribed in Table 1.
8.2 The yield point shall be determined by the drop of the
where:
E = elongation in 2 in. or 50 mm, %, and
beam or by the halt in the gage of the testing machine, by the
t = actual thickness of specimen, in.
useofdividers,orbyotherapprovedmethods.Whenadefinite
yieldpointisnotexhibited,theyieldstrengthcorrespondingto
a permanent offset of 0.2% of the gage length of the specimen
TABLE 2 Chemical Requirements
or to a total extension of 0.5% of the gage length of the
Composition, %
specimen under load shall be determined.
Carbon, Manganese, Phosphorus, Sulfur,
8.3 The test specimen taken across the weld shall show a
max max max max
tensile strength not less than the minimum tensile strength
Heat Product Heat Product Heat Product Heat Product
specified for the grade of pipe ordered. This test will not be
Grade A
required for pipe under NPS 8.
Seamless 0.22 0.25 0.90 0.95 0.035 0.045 0.050 0.060
A
E.R.W. 0.21 0.25 0.90 0.95 0.035 0.045 0.050 0.060
Grade B
9. Flattening Test Requirements
Seamless 0.27 0.30 1.15 1.20 0.035 0.045 0.050 0.060
A
E.R.W. 0.26 0.30 1.15 1.20 0.035 0.045 0.050 0.060
9.1 Seamless Pipe—For seamless pipe, a section not less
A 1
Electric-Resistance-Welded pipe. than2 ⁄2in.(63.5mm)inlengthshallbeflattenedcoldbetween
parallelplatesintwosteps.Duringthefirststep,whichisatest
forductility,nocracksorbreaksontheinsideoroutsideorend
analysis shall be in accordance with Test Methods, Practices, surfaces, except as provided for in 9.5, shall occur until the
and Terminology A751.
distance between the plates is less than the value of H
calculated by the following equation:
6. Heat Analysis
~11e!t
H 5 (1)
6.1 When specified in the purchase order, the manufacturer
t
e1
D
shall report the heat analysis of each heat of steel used in the
manufacture of pipe to this specification. The analysis shall
where:
conform to the requirements specified in Section 5 for the
H = distance between flattening plates, in. (mm),
grade of pipe ordered.
A 523 – 96 (2001)
TABLE 3 Dimensions, Weight, and Test Pressures
e = deformation per unit length (constant for a given
NPS Outside Wall Nominal Test Pressure
gradeofsteel,0.09forGradeAand0.07forGradeB),
Desig- Di- Thickness Weight
t = specified wall thickness, in. (mm), and Grade A Grade B
nator ameter,
D = specified outside diameter, in. (mm).
in.
in. mm lb/ft kg/m psi MPa psi MPa
During the second step, which is a test for soundness, the
44 ⁄2 0.237 6.02 10.79 16.1 1900 13.10 2200 15.17
flattening shall be continued until the specimen breaks or the
0.250 6.35 11.35 16.9 2000 13.79 2300 15.86
0.281 7.14 12.66 18.8 2200 15.17 2500 17.24
opposite walls of the pipe meet. Evidence of laminated or
0.312 7.92 13.96 20.7 2500 17.24 2500 17.24
unsound material that is revealed during the entire flattening
55 ⁄16 0.219 5.56 12.50 18.6 1400 9.65 1700 11.72
test shall be cause for rejection.
0.258 6.55 14.62 21.8 1700 11.72 1900 13.10
0.281 7.14 15.85 23.6 1800 12.41 2100 14.48
9.2 Electric-Resistance-WeldedPipe—Aspecimenatleast4
0.312 7.92 17.50 26.0 2000 13.79 2400 16.55
in. (101.6 mm) in length shall be flattened cold between
0.344 8.74 19.17 28.6 2200 15.17 2500 17.24
parallel plates in three steps with the weld located either 0 or
66 ⁄8 0.250 6.35 17.02 25.3 1400 9.65 1600 11.03
0.280 7.11 18.97 28.2 1500 10.34 1800 12.41
90° from the line of direction of force as required in 9.2.1
0.312 7.92 21.04 31.3 1700 11.72 2000 13.79
duringthefirststep,whichisatestforductilityoftheweld,no
0.344 8.74 23.08 34.3 1900 13.10 2200 15.17
cracks or breaks on the inside or outside surfaces shall occur 0.375 9.52 25.03 37.2 2000 13.79 2400 16.55
A A A A
0.500 12.70 32.71 48.7 2500 17.24 2500 17.24
until the distance between the plates is less than two thirds of
88 ⁄8 0.250 6.35 22.36 33.3 1000 6.89 1200 8.27
the original outside diameter of the pipe.As a second step, the
0.277 7.04 24.70 36.8 1200 8.27 1300 8.96
flattening shall be continued. During the second step, which is 0.312 7.92 27.70 41.2 1300 8.96 1500 10.34
0.322 8.18 28.55 42.6 1300 8.96 1600 11.03
test for ductility exclusive of the weld, no cracks or breaks on
0.344 8.74 30.42 45.3 1400 9.65 1700 11.72
the inside or outside surfaces, except as provided for in 9.5,
0.375 9.52 33.04 49.2 1600 11.03 1800 12.41
shalloccuruntilthedistancebetweentheplatesislessthanone 0.438 11.13 38.30 57.0 1800 12.41 2100 14.48
0.500 12.70 43.39 64.6 2100 14.48 2400 16.55
third of the original outside diameter of the pipe but is not less
10 10 ⁄4 0.250 6.35 28.04 41.7 850 5.86 1000 6.89
than five times the wall thickness of the pipe. During the third
0.279 7.09 31.20 46.4 1000 6.89 1200 8.27
step, which is a test for soundness, the flattening shall be 0.307 7.80 34.24 50.9 1000 6.89 1200 8.27
0.344 8.74 38.23 56.9 1100 7.58 1300 8.96
continueduntilthespecimenbreaksortheoppositewallsofthe
0.365 9.27 40.48 60.2 1200 8.27 1400 9.65
pipe meet. Evidence of laminated or unsound material or of
0.438 11.13 48.24 71.6 1500 10.34 1700 11.72
incompleteweldthatisrevealedduringtheentireflatteningtest 0.500 12.70 54.74 8.15 1700 11.72 2000 13.79
A A A A
0.562 14.27 61.15 91.0 1900 13.10 2200 15.17
shall be cause for rejection.
12 12 ⁄4 0.250 6.35 33.38 49.7 700 4.83 800 5.52
9.2.1 For pipe produced in single lengths, the flattening test
0.281 7.14 37.42 55.7 800 5.52 950 6.55
0.312 7.92 41.45 61.7 900 6.21 1000 6.89
specified in 9.2 shall be made on both crop ends cut from each
0.330 8.38 43.77 65.1 1000 6.89 1200 8.27
length of pipe. The tests from each end shall be made
0.344 8.74 45.58 67.8 1000 6.89 1200 8.27
alternately with the weld at 0° and at 90° from the line of
0.375 9.52 49.56 73.7 1100 7.58 1200 8.27
direction of force. For pipe produced in multiple lengths, the 0.438 11.13 57.59 86.7 1200 8.27 1400 9.65
0.500 12.70 65.42 97.3 1400 9.65 1600 11.03
flatteningtestshallbemadeoncropendsrepresentingthefront
A A A A
0.562 14.27 73.15 108.8 1600 11.03 1900 13.10
and back of each coil with the weld at 90° from the line of
A
Designates weights heavier than extra-strong.
direction of force, and on two intermediate rings representing
each coil with the weld 0° from the line of direction of force.
9.3 Surface imperfections in the test specimen before flat-
12. Dimensions, Weight, and Permissible Variations
tening, but revealed during the first step of the flattening test,
12.1 Weight—The weight of the pipe as specified inTable 3
shall be judged in accordance with the finish requirements in
shall not vary by more than the following amounts:
Section 15.
Extra-strong and lighter wall thickness 65%
9.4 Superficial ruptures as a result of surface imperfections
Minimum permissible length 610 %
shall not be cause for rejection.
12.2 Diameter—The outside diameter shall not vary more
9.5 When low D-to-t ratio tubulars are tested, because the
than plus or minus 1% from the diameter specified. Pipe NPS
strain imposed due to geometry is unreasonably high on the
10 and smaller shall not be more than ⁄64 in. (0.4 mm) smaller
insidesurfaceatthe6and12o’clocklocations,cracksatthese
and NPS 12 pipe shall not be more
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