ASTM A106/A106M-19a

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A106/A106M − 19 A106/A106M − 19a Used in USDOE-NE standards
Standard Specification for
Seamless Carbon Steel Pipe for High-Temperature Service
This standard is issued under the fixed designation A106/A106M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers seamless carbon steel pipe for high-temperature service (Note 1) in NPS ⁄8 to NPS 48 [DN 6 to
DN 1200] (Note 2) inclusive, with nominal (average) wall thickness as given in ASME B 36.10M. It shall be permissible to furnish
pipe having other dimensions provided such pipe complies with all other requirements of this specification. Pipe ordered under this
specification shall be suitable for bending, flanging, and similar forming operations, and for welding. When the steel is to be
welded, it is presupposed that a welding procedure suitable to the grade of steel and intended use or service will be utilized.
NOTE 1—It is suggested, consideration be given to possible graphitization.
NOTE 2—The dimensionless designator NPS (nominal pipe size) [DN (diameter nominal)] has been substituted in this standard for such traditional
terms as “nominal diameter,” “size,” and “nominal size.”
1.2 Supplementary requirements of an optional nature are provided for seamless pipe intended for use in applications where a
superior grade of pipe is required. These supplementary requirements call for additional tests to be made and when desired shall
be so stated in the order.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.4 The following precautionary caveat pertains only to the test method portion, Sections 11, 12, and 13 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A530/A530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E309 Practice for Eddy Current Examination of Steel Tubular Products Using Magnetic Saturation
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
2.2 ASME Standard:
ASME B 36.10M Welded and Seamless Wrought Steel Pipe
2.3 Military Standards:
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage
This specification is under the jurisdiction of Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.09 on
Carbon Steel Tubular Products.
Current edition approved May 1, 2019Nov. 1, 2019. Published May 2019November 2019. Originally approved in 1926. Last previous edition approved in 20182019 as
A106/A106M – 18.A106/A106M – 19. DOI: 10.1520/A0106_A0106M-19.10.1520/A0106_A0106M-19A.
For ASME Boiler and Pressure Vessel Code applications see related Specifications SA-106 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A106/A106M − 19a
2.4 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
Fed. Std. No. 183 Continuous Identification Marking of Iron and Steel Products
2.5 Other Standards:
SSPC-SP 6 Surface Preparation Specification No. 6
3. Ordering Information
3.1 The inclusion of the following, as required will describe the desired material adequately, when ordered under this
specification:
3.1.1 Quantity (feet, metres, or number of lengths),
3.1.2 Name of material (seamless carbon steel pipe),
3.1.3 Grade (Table 1),
3.1.4 Manufacture (hot-finished or cold-drawn),
3.1.5 Size (NPS [DN] and weight class or schedule number, or both; outside diameter and nominal wall thickness; or inside
diameter and nominal wall thickness),
3.1.6 Special outside diameter tolerance pipe (16.2.2),
3.1.7 Inside diameter tolerance pipe, over 10 in. [250 mm] ID (16.2.3),
3.1.8 Length (specific or random, Section 17),
3.1.9 Optional requirements (Section(S1 9 and S1 to S8),S9),
3.1.10 Test report required (Section on Certification of Specification A530/A530M),
3.1.11 Specification designation (A106 or A106M, including year-date),
3.1.12 End use of material,
3.1.13 Hydrostatic test in accordance with Specification A530/A530M or 13.3 of this specification, or NDE in accordance with
Section 14 of this specification.
3.1.14 Special requirements.
4. Process
4.1 The steel shall be killed steel, with the primary melting process being open-hearth, basic-oxygen, or electric-furnace,
possibly combined with separate degassing or refining. If secondary melting, using electroslag remelting or vacuum-arc remelting
is subsequently employed, the heat shall be defined as all of the ingots remelted from a single primary heat.
4.2 Steel cast in ingots or strand cast is permissible. When steels of different grades are sequentially strand cast, identification
of the resultant transition material is required. The producer shall remove the transition material by any established procedure that
positively separates the grades.
4.3 For pipe NPS 1 ⁄2 [DN 40] and under, it shall be permissible to furnish hot finished or cold drawn.
4.4 Unless otherwise specified, pipe NPS 2 [DN 50] and over shall be furnished hot finished. When agreed upon between the
manufacturer and the purchaser, it is permissible to furnish cold-drawn pipe.
TABLE 1 Chemical Requirements
Composition, %
Grade A Grade B Grade C
A B B
Carbon, max 0.25 0.30 0.35
Manganese 0.27–0.93 0.29–1.06 0.29–1.06
Phosphorus, max 0.035 0.035 0.035
Sulfur, max 0.035 0.035 0.035
Silicon, min 0.10 0.10 0.10
C
Chromium, max 0.40 0.40 0.40
C
Copper, max 0.40 0.40 0.40
C
Molybdenum, max 0.15 0.15 0.15
C
Nickel, max 0.40 0.40 0.40
C
Vanadium, max 0.08 0.08 0.08
A
For each reduction of 0.01 % below the specified carbon maximum, an increase
of 0.06 % manganese above the specified maximum will be permitted up to a
maximum of 1.35 %.
B
Unless otherwise specified by the purchaser, for each reduction of 0.01 % below
the specified carbon maximum, an increase of 0.06 % manganese above the
specified maximum will be permitted up to a maximum of 1.65 %.
C
These five elements combined shall not exceed 1 %.
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http://www.sspc.org.
A106/A106M − 19a
5. Heat Treatment
5.1 Hot-finished pipe need not be heat treated. When hot-finished pipe is heat treated, it shall be heat treated at a temperature
of 1200 °F [650 °C] or higher.
5.2 Cold-drawn pipe shall be heat treated after the final cold draw pass at a temperature of 1200 °F [650 °C] or higher.
6. General Requirements
6.1 Material furnished to this specification shall conform to the applicable requirements of the current edition of Specification
A530/A530M unless otherwise provided herein.
7. Chemical Composition
7.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 1.
8. Heat Analysis
8.1 An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elements
specified in Section 7. If the secondary melting processes of 5.1 are employed, the heat analysis shall be obtained from one
remelted ingot or the product of one remelted ingot of each primary melt. The chemical composition thus determined, or that
determined from a product analysis made by the manufacturer, if the latter has not manufactured the steel, shall be reported to the
purchaser or the purchaser’s representative, and shall conform to the requirements specified in Section 7.
9. Product Analysis
9.1 At the request of the purchaser, analyses of two pipes from each lot (see 20.1) shall be made by the manufacturer from the
finished pipe. The results of these analyses shall be reported to the purchaser or the purchaser’s representative and shall conform
to the requirements specified in Section 7.
9.2 If the analysis of one of the tests specified in 9.1 does not conform to the requirements specified in Section 7, analyses shall
be made on additional pipes of double the original number from the same lot, each of which shall conform to requirements
specified.
10. Tensile Requirements
10.1 The material shall conform to the requirements as to tensile properties given in Table 2.
11. Bending Requirements
11.1 For pipe NPS 2 [DN 50] and under, a sufficient length of pipe shall stand being bent cold through 90° around a cylindrical
mandrel, the diameter of which is twelve times the outside diameter (as shown in ASME B 36.10M) of the pipe, without
TABLE 2 Tensile Requirements
Grade A Grade B Grade C
Tensile strength, min, psi [MPa] 48 000 [330] 60 000 [415] 70 000 [485]
Yield strength, min, psi [MPa] 30 000 [205] 35 000 [240] 40 000 [275]
Longitu- Transverse Longitu- Transverse Longitu- Transverse
dinal dinal dinal
Elongation in 2 in. [50 mm], min, %:
Basic minimum elongation transverse strip tests, and for all small 35 25 30 16.5 30 16.5
sizes tested in full section
When standard round 2-in. [50-mm] gauge length test specimen is 28 20 22 12 20 12
used
A A A
For longitudinal strip tests
For transverse strip tests, a deduction for each ⁄32-in. [0.8-mm] 1.25 1.00 1.00
decrease in wall thickness below ⁄16 in. [7.9 mm] from the basic
minimum elongation of the following percentage shall be made
A
The minimum elongation in 2 in. [50 mm] shall be determined by the following equation:
0.2 0.9
e 5625000A / U
for inch-pound units, and
0.2 0.9
e 51940A /U
for SI units,
where:
e = minimum elongation in 2 in. [50 mm], %, rounded to the nearest 0.5 %,
2 2
A = cross-sectional area of the tension test specimen, in. [mm ], based upon specified outside diameter or nominal specimen width and specified wall thickness,
2 2 2 2 2 2
rounded to the nearest 0.01 in. [1 mm ]. (If the area thus calculated is equal to or greater than 0.75 in. [500 mm ], then the value 0.75 in. [500 mm ]
shall be used.), and
U = specified tensile strength, psi [MPa].
A106/A106M − 19a
developing cracks. When ordered for close coiling, the pipe shall stand being bent cold through 180° around a cylindrical mandrel,
the diameter of which is eight times the outside diameter (as shown in ASME B 36.10M) of the pipe, without failure.
11.2 For pipe whose diameter exceeds 25 in. [635 mm] and whose diameter to wall thickness ratio, where the diameter to wall
thickness ratio is the specified outside diameter divided by the nominal wall thickness, is 7.0 or less, the bend test shall be
conducted. The bend test specimens shall be bent at room temperature through 180° with the inside diameter of the bend being
1 in. [25 mm] without cracking on the outside portion of the bent portion.
Example: For 28 in. [711 mm] diameter 5.000 in. [127 mm] thick pipe the diameter to wall thickness ratio = 28/5 = 5.6 [711/127
= 5.6].
12. Flattening Tests
12.1 Although testing is not required, pipe shall be capable of meeting the flattening test requirements of Supplementary
Requirement S3, if tested.
13. Hydrostatic Test
13.1 Except as allowed by 13.2, 13.3, and 13.4, each length of pipe shall be subjected to the hydrostatic test without leakage
through the pipe wall.
13.2 As an alternative to the hydrostatic test at the option of the manufacturer or where specified in the purchase order, it shall
be permissible for the full body of each pipe to be tested with a nondestructive electric test described in Section 14.
13.3 Where specified in the purchase order, it shall be permissible for pipe to be furnished without the hydrostatic test and
without the nondestructive electric test in Section 14; in this case, each length so furnished shall include the mandatory marking
of the letters “NH.” It shall be permissible for pipe meeting the requirements of 13.1 or 13.2 to be furnished where pipe without
either the hydrostatic or nondestructive electric test has been specified in the purchase order; in this case, such pipe need not be
marked with the letters “NH.” Pipe that has failed either the hydrostatic test of 13.1 or the nondestructive electric test of 13.2 shall
not be furnished as “NH” pipe.
13.4 Where the hydrostatic test and the nondestructive electric test are omitted and the lengths marked with the letters “NH,”
the certification, where required, shall clearly state “Not Hydrostatically Tested,” and the letters “NH” shall be appended to the
product specification number and material grade shown on the certification.
14. Nondestructive Electric Test
14.1 As an alternative to the hydrostatic test at the option of the manufacturer or where specified in the purchase order as an
alternative or addition to the hydrostatic test, the full body of each pipe shall be tested with a nondestructive electric test in
accordance with Practice E213, E309, or E570. In such cases, the marking of each length of pipe so furnished shall include the
letters “NDE.” It is the intent of this nondestructive electric test to reject pipe with imperfections that produce test signals equal
to or greater than that produced by the applicable calibration standard.
14.2 Where the nondestructive electric test is performed, the lengths shall be marked with the letters “NDE.” The certification,
where required, shall state “Nondestructive Electric Tested” and shall indicate which of the tests was applied. Also, the letters
“NDE” shall be appended to the product specification number and material grade shown on the certification.
14.3 The following information is for the benefit of the user of this specification:
14.3.1 The reference standards defined in 14.4 through 14.6 are convenient standards for calibration of nondestructive testing
equipment. The dimensions of such standards are not to be construed as the minimum sizes of imperfections detectable by such
equipment.
14.3.2 The ultrasonic testing referred to in this specification is capable of detecting the presence and location of significant
longitudinally or circumferentially oriented imperfections; however, different techniques need to be employed for the detection of
such differently oriented imperfections. Ultrasonic testing is not necessarily capable of detecting short, deep imperfections.
14.3.3 The eddy current examination referenced in this specification has the capability of detecting significant imperfections,
especially of the short abrupt type.
14.3.4 The flux leakage examination referred to in this specification is capable of detecting the presence and location of
significant longitudinally or transversely oriented imperfections; however, different techniques need to be employed for the
detection of such differently oriented imperfections.
14.3.5 The hydrostatic test referred to in Section 13 has the capability of finding defects of a size permitting the test fluid to
leak through the tube wall and may be either visually seen or detected by a loss of pressure. Hydrostatic testing is not necessarily
capable of detecting very tight, through-the-wall imperfections or imperfections that extend an appreciable distance into the wall
without complete penetration.
14.3.6 A purchaser interested in ascertaining the nature (type, size, location, and orientation) of discontinuities that can be
detected in the specific applications of these examinations is directed to discuss this with the manufacturer of the tubular product.
A106/A106M − 19a
14.4 For ultrasonic testing, the calibration reference notches shall be, at the option of the producer, any one of the three common
notch shapes shown in Practice E213. The depth of notch shall not exceed 12 ⁄2 % of the specified wall thickness of the pipe or
0.004 in. [0.1 mm], whichever is greater.
14.5 For eddy current testing, the calibration pipe shall contain, at the option of the producer, any one of the following
discontinuities to establish a minimum sensitivity level for rejection:
14.5.1 Drilled Hole—The calibration pipe shall contain depending upon the pipe diameter three holes spaced 120° apart or four
holes spaced 90° apart and sufficiently separated longitudinally to ensure separately distinguishable responses. The holes shall be
drilled radially and completely through the pipe wall, care being taken to avoid distortion of the pipe while drilling. Depending
upon the pipe diameter the calibration pipe shall contain the following hole:
NPS DN Diameter of Drilled Hole
# ⁄2 # 15 0.039 in. [1 mm]
1 1
> ⁄2 # 1 ⁄4 > 15 # 32 0.055 in. [1.4 mm]
> 1 ⁄4 # 2 > 32 # 50 0.071 in. [1.8 mm]
> 2 # 5 > 50 # 125 0.087 in. [2.2 mm]
>5 > 125 0.106 in. [2.7 mm]
14.5.2 Transverse Tangential Notch—Using a round tool or file with a ⁄4-in. [6-mm] diameter, a notch shall be filed or milled
tangential to the surface and transverse to the longitudinal axis of the pipe. The notch shall have a depth not exceeding 12 ⁄2 %
of the specified wall thickness of the pipe or 0.004 in. [0.1 mm], whichever is greater.
14.5.3 Longitudinal Notch—A notch 0.031 in. [0.8 mm] or less in width shall be machined in a radial plane parallel to the tube
axis on the outside surface of the pipe, to have a depth not exceeding 12 ⁄2 % of the specified wall thickness of the tube or 0.004
in. [0.1 mm], whichever is greater. The length of the notch shall be compatible with the testing method.
14.5.4 Compatibility—The discontinuity in the calibration pipe shall be compatible with the testing equipment and the method
being used.
14.6 For flux leakage testing, the longitudinal calibration reference notches shall be straight-sided notches machined in a radial
plane parallel to the pipe axis. For wall thicknesses under ⁄2 in. [12.7 mm], outside and inside notches shall be used; for wall
1 1
thicknesses equal to and above ⁄2 in. [12.7 mm], only an outside notch shall be used. Notch depth shall not exceed 12 ⁄2 % of the
specified wall thickness, or 0.004 in. [0.1 mm], whichever is greater. Notch length shall not exceed 1 in. [25 mm], and the width
shall not exceed the depth. Outside diameter and inside diameter notches shall be located sufficiently apart to allow separation and
identification of the signals.
14.7 Pipe containing one or more imperfections that produce a signal equal to or greater than the signal produced by the
calibration standard shall be rejected or the area producing the signal shall be reexamined.
14.7.1 Test signals produced by imperfections which cannot be identified, or produced by cracks or crack-like imperfections
shall result in rejection of the pipe, unless it is repaired and retested. To be accepted, the pipe must pass the same specification test
to which it was originally subjected, provided that the remaining wall thickness is not decreased below that permitted by this
specification. The OD at the point of grinding may be reduced by the amount so reduced.
14.7.2 Test signals produced by visual imperfections such as those listed below may be evaluated in accordance with the
provisions of Section 18:
14.7.2.1 Dinges,
14.7.2.2 Straightener marks,
14.7.2.3 Cutting chips,
14.7.2.4 Scratches,
14.7.2.5 Steel die stamps,
14.7.2.6 Stop marks, or
14.7.2.7 Pipe reducer ripple.
14.8 The test methods described in this section are not necessarily capable of inspecting the end portion of pipes, a condition
referred to as “end effect.” The length of such end effect shall be determined by the manufacturer and, when specified
...