ASTM A523-96(2012)
(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
ABSTRACT
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. The steel shall be made by one or more of the following processes: open-hearth, basic-oxygen, or electric-furnace. Tensile strength tests, flattening test, hydrostatic tests shall be made for the materials to conform the requirements as specified. If the results of the mechanical tests do not conform to requirements specified, retests shall be made.
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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 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.
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Standards Content (Sample)
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Designation:A523 −96 (Reapproved 2012)
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations prior
1.1 This specification covers seamless and electric-
to use.
resistance-weldedsteelpipeusedasconduitfortheinstallation
of high-pressure pipe-type electrical cables in NPS 4 to NPS
2. Referenced Documents
12,inclusive,withnominal(average)wallthicknesses0.219to
0.562 in., depending on size. Pipe having other dimensions 2.1 ASTM Standards:
A370Test Methods and Definitions for Mechanical Testing
(Note 2) may be furnished, provided such pipe complies with
all other requirements of this specification. of Steel Products
A751Test Methods, Practices, and Terminology for Chemi-
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
cal Analysis of Steel Products
been substituted in this standard for such traditional terms as “nominal
E59Practice for Sampling Steel and Iron for Determination
diameter,” “size,” and “nominal size.”
of Chemical Composition (Withdrawn 1996)
NOTE 2—A comprehensive listing of standardized pipe dimensions is
contained in ANSI B36.10.
2.2 ANSI Standard:
B36.10Welded and Seamless Wrought Steel Pipe
1.2 Pipe ordered under this specification is suitable for
welding and for forming operations involving flaring, belling,
3. Ordering Information
and bending.
3.1 Orders for material under this specification should
1.3 Pipe for this purpose shall be furnished in Grade A or
include the following, as required, to describe the desired
Grade B as specified in the purchase order. Grade A is more
material adequately:
suitable for forming operations involving bending, flaring, or
3.1.1 Quantity (feet or number of lengths),
belling and this grade is normally preferred. This provision is
3.1.2 Name of material (steel pipe),
not intended to prohibit the cold bending, flaring, or belling of
3.1.3 Method of manufacture (seamless or electric-
Grade B pipe.
resistance-welded),
1.4 The values stated in inch-pound units are to be regarded
3.1.4 Grade (Table 1),
as standard. The values given in parentheses are mathematical
3.1.5 Size (outside diameter and nominal wall thickness or
conversions to SI units that are provided for information only
weight per foot),
and are not considered standard.
3.1.6 Length when other than specified in Section 13,
1.5 The following hazard caveat applies to the test method
3.1.7 End finish (Section 16),
portion, Section 20, of this specification: This standard does
3.1.8 Skelp for tension tests, if permitted 20.2,
not purport to address all of the safety concerns, if any,
3.1.9 When mill applied coating is required (Section 10),
associatedwithitsuse.Itistheresponsibilityoftheuserofthis
and
3.1.10 ASTM specification number.
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.09 on Carbon Steel Tubular Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2012. Published November 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1964. Last previous edition approved in 2005 as A523–96 (2005). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0523-96R12. the ASTM website.
This specification was initiated by the IEEE Insulated Conductors Committee in The last approved version of this historical standard is referenced on
recognition of the need for a specification embodying the special requirements of www.astm.org.
pipeforhigh-voltageelectricalcircuits.ItwaspreparedforacceptanceasanASTM Available from American National Standards Institute, 11 West 42nd St., 13th
specification by a task group of Subcommittee A01.09 of ASTM Committee A01. Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A523−96 (2012)
TABLE 1 Tensile Requirements TABLE 2 Chemical Requirements
Grade A Grade B Composition, %
Tensile strength, min, ksi (MPa) 48 (330) 60 (415) Carbon, Manganese, Phosphorus, Sulfur,
Yield strength, min, ksi (MPa) 30 (205) 35 (240) max max max max
Elongation in 2 in. or 50 mm, %:
Heat Product Heat Product Heat Product Heat Product
Basic minimum elongation for walls ⁄16 in. (7.94 35 30
Grade A
mm) and over in thickness, longitudinal strip
Seamless 0.22 0.25 0.90 0.95 0.035 0.045 0.050 0.060
tests, and for small sizes tested in full section.
A
E.R.W. 0.21 0.25 0.90 0.95 0.035 0.045 0.050 0.060
When standard round 2-in. or 50-mm gage length 28 22
Grade B
test specimen is used
A A Seamless 0.27 0.30 1.15 1.20 0.035 0.045 0.050 0.060
For longitudinal strip tests, the width of the gage 1.75 1.50
A
1 E.R.W. 0.26 0.30 1.15 1.20 0.035 0.045 0.050 0.060
section shall be 1 ⁄2 in. (38.1 mm) and a
A
deduction for each ⁄32 in. (0.79 mm) decrease in
Electric-Resistance-Welded pipe.
wall thickness below ⁄16 in. (7.94 mm) from the
basic minimum elongation of the following
percentage points
A B
conform to the requirements specified in Section 5 for the
The following table gives the minimum computed values:
grade of pipe ordered.
7. Product Analysis
Wall Thickness Elongation in 2 in. or 50
mm, min, %
7.1 Whenspecifiedinthepurchaseorder,aproductanalysis
in. mm Grade A Grade B
report shall be furnished by the manufacturer on two pipes
⁄16 (0.312) 7.94 35.0 30.0
from each lot of 400 lengths, or fraction thereof, of 4 ⁄2-in.
⁄32 (0.281) 7.14 33.2 28.5
⁄4 (0.250) 6.35 31.5 27.0 outside diameter and 5 ⁄16-in. outside diameter sizes and from
⁄32 (0.219) 5.56 29.8 25.5 5
each lot of 200 lengths, or fraction thereof, of each size 6 ⁄8-in.
⁄16 (0.188) 4.76 28.0 24.0
outside diameter through 12 ⁄4-in. outside diameter pipe.
⁄32 (0.156) 3.97 26.2 22.5
Samples for chemical analysis, except for spectrographic
⁄8 (0.125) 3.18 24.5 21.0
⁄32 (0.094) 2.38 22.8 19.5
analysis, shall be taken in accordance with Practice E59. The
⁄16 (0.062) 1.59 21.0 18.0
chemical composition thus determined shall conform to the
B
This table gives the computed minimum elongation values for each ⁄32 in. requirements specified in Section 5.
(0.79 mm) decrease in wall thickness. Where the wall thickness lies between two
7.2 Product Analysis Retests—If both lengths of pipe rep-
values shown above, the minimum elongation value shall be determined by the
following equation:
resentingthelotfailthespecifiedproductanalysis,thelotshall
be rejected, or at the option of the manufacturer, all of the
Grade Equation
remaining lengths of the lot shall be tested individually for
A E=56t + 17.50
B E=48t + 15.00
conformance to the specified requirements. If only one of the
lengths of pipe representing the lot fails the specified check
where:
analysis, the lot shall be rejected or, at the option of the
E = elongation in 2 in. or 50 mm,%, and
manufacturer, two retest analyses shall be made on two
t = actual thickness of specimen, in.
additional lengths selected from the same lot. If both of these
retest analyses conform to the specified requirements, the lot
shall be accepted except for the length which failed on the
initial analysis. If one or both of the retest analyses fail the
4. Process
specifiedrequirements,theentirelotshallberejected,or,atthe
4.1 Thesteelshallbemadebyoneormoreofthefollowing option of the manufacturer, each of the remaining lengths shall
processes: open-hearth, basic-oxygen, or electric-furnace. betestedindividually.Onlyanalysisoftherejectingelementor
elements is necessary in checking the remaining lengths.
4.2 Steel may be cast in ingots or may be strand cast.When
steels of different grades are sequentially strand cast, identifi-
8. Tensile Requirements
cation of the resultant transition material is required. The
8.1 The material shall conform to the requirements as to
producer shall remove the transition material by any estab-
tensile properties prescribed in Table 1.
lished procedure that positively separates the grades.
8.2 The yield point shall be determined by the drop of the
5. Chemical Composition
beam or by the halt in the gauge of the testing machine, by the
useofdividers,orbyotherapprovedmethods.Whenadefinite
5.1 The steel shall conform to the requirements as to
yieldpointisnotexhibited,theyieldstrengthcorrespondingto
chemical composition prescribed in Table 2 and the chemical
a permanent offset of 0.2% of the gauge length of the
analysis shall be in accordance with Test Methods, Practices,
specimen or to a total extension of 0.5% of the gauge length
and Terminology A751.
of the specimen under load shall be determined.
6. Heat Analysis
8.3 The test specimen taken across the weld shall show a
6.1 When specified in the purchase order, the manufacturer tensile strength not less than the minimum tensile strength
shall report the heat analysis of each heat of steel used in the specified for the grade of pipe ordered. This test will not be
manufacture of pipe to this specification. The analysis shall required for pipe under NPS 8.
A523−96 (2012)
9. Flattening Test Requirements 9.5 When low D-to-t ratio tubulars are tested, because the
strain imposed due to geometry is unreasonably high on the
9.1 Seamless Pipe—For seamless pipe, a section not less
inside surface at the 6 and 12 o’clock locations, cracks at these
than2 ⁄2in.(63.5mm)inlengthshallbeflattenedcoldbetween
locations shall not be cause for rejection if the D-to-t ratio is
parallelplatesintwosteps.Duringthefirststep,whichisatest
less than ten.
forductility,nocracksorbreaksontheinsideoroutsideorend
surfaces, except as provided for in 9.5, shall occur until the
10. Coatings
distance between the plates is less than the value of H
10.1 Unless otherwise specified, the pipe shall not be given
calculated by the following equation:
a mill coating of paint, oil, or any other material either inside
~11e!t
or outside.
H 5 (1)
t
e1
D
11. Dimensions and Weight
where:
11.1 Dimensions and weight of pipe included in this speci-
fication are listed in Table 3.
H = distance between flattening plates, in. (mm),
e = deformation per unit length (constant for a given
12. Dimensions, Weight, and Permissible Variations
grade of steel, 0.09 for GradeAand 0.07 for Grade B),
t = specified wall thickness, in. (mm), and
12.1 Weight—The weight of the pipe as specified in Table 3
D = specified outside diameter, in. (mm).
shall not vary by more than the following amounts:
During the second step, which is a test for soundness, the
Extra-strong and lighter wall thickness ±5 %
Minimum permissible length ±10 %
flattening shall be continued until the specimen breaks or the
opposite walls of the pipe meet. Evidence of laminated or
unsound material that is revealed during the entire flattening
test shall be cause for rejection. TABLE 3 Dimensions, Weight, and Test Pressures
NPS Outside Wall Nominal Test Pressure
9.2 Electric-Resistance-WeldedPipe—Aspecimenatleast4
Desig- Di- Thickness Weight
Grade A Grade B
in. (101.6 mm) in length shall be flattened cold between
nator ameter,
in. mm lb/ft kg/m psi MPa psi MPa
parallel plates in three steps with the weld located either 0 or in.
44 ⁄2 0.237 6.02 10.79 16.1 1900 13.10 2200 15.17
90° from the line of direction of force as required in 9.2.1
0.250 6.35 11.35 16.9 2000 13.79 2300 15.86
duringthefirststep,whichisatestforductilityoftheweld,no
0.281 7.14 12.66 18.8 2200 15.17 2500 17.24
cracks or breaks on the inside or outside surfaces shall occur
0.312 7.92 13.96 20.7 2500 17.24 2500 17.24
55 ⁄16 0.219 5.56 12.50 18.6 1400 9.65 1700 11.72
until the distance between the plates is less than two thirds of
0.258 6.55 14.62 21.8 1700 11.72 1900 13.10
the original outside diameter of the pipe.As a second step, the
0.281 7.14 15.85 23.6 1800 12.41 2100 14.48
flattening shall be continued. During the second step, which is
0.312 7.92 17.50 26.0 2000 13.79 2400 16.55
0.344 8.74 19.17 28.6 2200 15.17 2500 17.24
test for ductility exclusive of the weld, no cracks or breaks on
66 ⁄8 0.250 6.35 17.02 25.3 1400 9.65 1600 11.03
the inside or outside surfaces, except as provided for in 9.5,
0.280 7.11 18.97 28.2 1500 10.34 1800 12.41
shalloccuruntilthedistancebetweentheplatesislessthanone
0.312 7.92 21.04 31.3 1700 11.72 2000 13.79
0.344 8.74 23.08 34.3 1900 13.10 2200 15.17
third of the original outside diameter of the pipe but is not less
0.375 9.52 25.03 37.2 2000 13.79 2400 16.55
than five times the wall thickness of the pipe. During the third
A A A A
0.500 12.70 32.71 48.7 2500 17.24 2500 17.24
step, which is a test for soundness, the flattening shall be 5
88 ⁄8 0.250 6.35 22.36 33.3 1000 6.89 1200 8.27
0.277 7.04 24.70 36.8 1200 8.27 1300 8.96
continueduntilthespecimenbreaksortheoppositewallsofthe
0.312 7.92 27.70 41.2 1300 8.96 1500 10.34
pipe meet. Evidence of laminated or unsound material or of
0.322 8.18 28.55 42.6 1300 8.96 1600 11.03
incompleteweldthatisrevealedduringtheentireflatteningtest
0.344 8.74 30.42 45.3 1400 9.65 1700 11.72
0.375 9.52 33.04 49.2 1600 11.03 1800 12.41
shall be cause for rejection.
0.438 11.13 38.30 57.0 1800 12.41 2100 14.48
9.2.1 For pipe produced in single lengths, the flattening test
0.500 12.70 43.39 64.6 2100 14.48 2400 16.55
specified in 9.2 shall be made on both crop ends cut from each 10 10 ⁄4 0.250 6.35 28.04 41.7 850 5.86 1000 6.89
0.279 7.09 31.20 46.4 1000 6.89 1200 8.27
length of pipe. The tests from each end shall be made
0.307 7.80 34.24 50.9 1000 6.89 1200 8.27
alternately with the weld at 0° and at 90° from the line of
0.344 8.74 38.23 56.9 1100 7.58 1300 8.96
direction of force. For pipe produced in multiple lengths, the 0.365 9.27 40.48 60.2 1200 8.27 1400 9.65
0.438 11.13 48.24 71.6 1500 10.34 1700 11.72
flatteningtestshallbemadeoncropendsrepresentingthefront
0.500 12.70 54.74 8.15 1700 11.72 2000 13.79
and back of each coil with the weld at 90° from the line of A A A A
0.562 14.27 61.15 91.0 1900 13.10 2200 15.17
direction of force, and on two intermediate rings representing 12 12 ⁄4 0.250 6.35 33.38 49.7 700 4.83 800 5.52
0.281 7.14 37.42 55.7 800 5.52 950 6.55
each coil with the weld 0° from the line of direction of force.
0.312 7.92 41.45 61.7 9
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