ASTM A498 - A 498M - 25 带整体翅片的无缝和焊接碳钢热交换器管

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Designation: A498/A498M −25
Standard Speciﬁcation for
Seamless and Welded Carbon Steel Heat-Exchanger Tubes
with Integral Fins
1
This standard is issued under the ﬁxed designation A498/A498M; 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 describes seamless or welded low-
carbon steel tubes on which the external or internal surface, or
both, have been modiﬁed by a cold forming process to produce
an integral increased surface area for improved heat transfer.
The tubes are used in tubular heat exchangers, surface
condensers, evaporators, superheaters, and similar heat-
transfer apparatus in outside diameters up to 2 in. [50 mm],
inclusive.
1.2 Units—This speciﬁcation is expressed in both inch-
pound units and in SI units; however, unless the purchase order
or contract speciﬁes the applicable M speciﬁcation designation
(SI units), the inch-pound units shall apply. The values stated in
either inch-pound units or SI units are to be regarded separately
as standard. Within the text, the SI units are shown in brackets.
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.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
A179/A179M Speciﬁcation for Seamless Cold-Drawn Low-
Carbon Steel Heat-Exchanger and Condenser Tubes
A214/A214M Speciﬁcation for Electric-Resistance-Welded
Carbon Steel Heat-Exchanger and Condenser Tubes
A334/A334M Speciﬁcation for Seamless and Welded Car-
bon and Alloy-Steel Tubes for Low-Temperature Service
A450/A450M Speciﬁcation for General Requirements for
Carbon and Low Alloy Steel Tubes
A941 Terminology Relating to Steel, Stainless Steel, Related
Alloys, and Ferroalloys
A1016/A1016M Speciﬁcation for General Requirements for
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
Steel Tubes
A1047/A1047M Test Method for Pneumatic Leak Testing of
Tubing
3. Terminology
3.1 Deﬁnitions—For deﬁnitions of general terms used in this
speciﬁcation, refer to Terminology A941.
3.2 Deﬁnitions of Terms Speciﬁc to This Standard:
3.2.1 land—a length of unmodiﬁed tube between adjacent
sections of modiﬁed tube; used as support zones for baffles, or
for bending where surface modiﬁcation might compromise
material integrity, or for other reasons.
3.2.2 modiﬁed surface—the surface of a tube having a series
of integral ﬁns, grooves, or ribs on the outside diameter, inside
diameter, or both, for the purpose of increasing the surface area
and improving heat transfer.
3.2.3 unmodiﬁed surface—the cylindrical surface of a tube
made to the reference standards.
3.3 Symbols (Integral Fin Tube Nomenclature):
3.3.1 Bare tube symbols, see Fig. 1,Fig. 2, or Fig. 3.
3.3.1.1 OD = outside diameter of unmodiﬁed sections, and
3.3.1.2 W= wall thickness of unmodiﬁed sections.
3.3.2 OD surface modiﬁcation symbols, see Fig. 1.
3.3.2.1 od = outside diameter of modiﬁed sections,
3.3.2.2 rd = root diameter of outside ﬁns,
3.3.2.3 W
f
= wall thickness at ﬁn groove, either minimum or
average,
3.3.2.4 FH = ﬁn height,
3.3.2.5 N
fpu
= number of ﬁns per unit length, the reciprocal
of p,
3.3.2.6 p= pitch, the distance from a point on one ﬁn to the
corresponding point on the adjacent ﬁn along the tube longi-
tudinal axis, and
1
This speciﬁcation is under the jurisdiction of ASTM 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, 2025. Published May 2025. Originally
approved in 1963. Last previous edition approved in 2023 as A498/A498M – 17
(2023). DOI: 10.1520/A0498_A0498M-25.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at www.astm.org/contact. For Annual Book of
ASTM Standards volume information, refer to the standard’s Document Summary
page on the ASTM website.
*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
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.
1

3.3.2.7 p= the reciprocal of N

fpu

3.3.3 ID surface modiﬁcation symbols, see Fig. 2.

3.3.3.1 od = outside diameter of modiﬁed sections,

3.3.3.2 id = inside diameter of id modiﬁed sections, to root

of rib,

3.3.3.3 W

= wall thickness at rib groove, either minimum or

average,

3.3.3.4 RH = rib height,

3.3.3.5 RW = rib width,

3.3.3.6 HA = helix angle,

3.3.3.7 p= pitch, the distance from a point on one rib to the

corresponding point on the adjacent rib along the tube longi-

tudinal axis, and

3.3.3.8 N

rac

= number of ribs around circumference.

3.3.4 Combined (OD + ID) surface modiﬁcation symbols,

see Figs. 1-3.

3.3.4.1 od = outside diameter of modiﬁed sections,

3.3.4.2 id = inside diameter of modiﬁed sections, to root of

rib, and

3.3.4.3 W

= wall thickness of combined modiﬁed surface,

either minimum or average.

3.3.5 Length symbols, see Fig. 3.

3.3.5.1 L

= overall length,

3.3.5.2 L

BE1

= length of ﬁrst bare end,

3.3.5.3 L

BE2

= length of second bare end,

3.3.5.4 L

= length to ﬁrst intermediate land,

3.3.5.5 L

IL1

= length of ﬁrst intermediate land,

3.3.5.6 L

= length to second intermediate land,

3.3.5.7 L

IL2

= length of second intermediate land,

3.3.5.8 L

= length to n

intermediate land, and

3.3.5.9 L

ILn

= length of n

intermediate land.

3.4 Illustrations—See Figs. 1-3.

4. Ordering Information

4.1 It is the responsibility of the purchaser to specify

requirements that are necessary for tubing ordered under this

speciﬁcation. Such requirements may include, but are not

limited to, the following:

4.1.1 ASTM designation and year of issue for the modiﬁed

tube (this speciﬁcation).

4.1.2 ASTM designation and year of issue of the plain tube

from which the modiﬁed tube is to be manufactured.

4.1.3 Grade (if applicable).

4.1.4 Type of material (if applicable: seamless or welded).

4.1.5 Quantity.

4.1.6 Dimensions:

4.1.6.1 Outside diameter.

4.1.6.2 Wall thickness.

4.1.6.3 Length.

FIG. 1 OD Surface Modiﬁcation Symbols – Fins

FIG. 2 ID Surface Modiﬁcation Symbols – Ribs

FIG. 3 Combined OD and ID Surface Modiﬁcations Plus Length Symbols

A498/A498M − 25

4.1.6.4 All other desired dimensional attributes as described
in 3.3.2 – 3.3.5. Conﬁguration of these modiﬁed surface
attributes shall be as agreed between the purchaser and the
manufacturer.
4.1.7 Temper (as-cold-worked or annealed).
4.1.8 Packaging.
4.1.9 Customer inspection.
4.1.10 Certiﬁcation.
4.1.11 Special requirements and any supplementary require-
ments selected.
5. General Requirements
5.1 Products furnished to this speciﬁcation shall conform to
the requirements of Speciﬁcation A450/A450M, including any
supplementary requirements indicated in the purchase order or
contract. Failure to comply with the general requirements of
Speciﬁcation A450/A450M constitutes nonconformance with
this speciﬁcation. In case of conﬂict between the requirements
of this speciﬁcation and Speciﬁcation A450/A450M, this
speciﬁcation shall prevail.
6. Materials and Manufacture
6.1 The modiﬁed surface tubes shall be manufactured from
plain tubes that conform to one of the following ASTM
Speciﬁcations: A179/A179M,A214/A214M, or A334/A334M.
6.2 The modiﬁed surface tubes shall be produced by cold
forming of steel plain tubes. To comply with this speciﬁcation,
the modiﬁed surface and tube material must be integral.
6.3 Modiﬁed surface tubes shall normally be furnished with
unmodiﬁed ends, but may be furnished with modiﬁed surface
ends if speciﬁed.
7. Temper
7.1 The tube after modiﬁcation shall be supplied in either
the annealed or as-cold-worked condition, one of which shall
be speciﬁed on the purchaser order.
7.2 The annealed condition is deﬁned as having both the
modiﬁed and unmodiﬁed portions of the tube conforming to
the heat-treatment requirements of the speciﬁed ASTM plain
tube.
7.3 The as-cold-worked condition is deﬁned as having the
modiﬁed portions of the tube in the cold-worked condition
produced by the modifying operation; and the unmodiﬁed
portions of the tube conﬁrming to the heat-treatment require-
ments of the speciﬁed ASTM plain tube.
8. Chemical Composition
8.1 The steel shall conform to the chemical requirements
prescribed in the governing plain-tube speciﬁcation.
9. Tensile Requirements
9.1 The tube prior to the modifying operation, and the
unmodiﬁed portions of the tube, shall conform to the appli-
cable requirements for tensile properties prescribed in the
governing plain-tube speciﬁcation.
10. Pneumatic Test
10.1 At the completion of modifying operations, each tube
shall be subjected to a pneumatic test at a pressure of not less
than 250 psi [1.72 MPa]. At the option of the manfuacturer, this
can either be the Air Under Water Test or the Pneumatic Leak
Test.
10.1.1 Air Under Water Test—This test is to be in accord
with Speciﬁcation A450/A450M or Speciﬁcation A1016/
A1016M.
10.1.2 Pneumatic Leak Test—This test is to be in accord
with Speciﬁcation A450/A450M or Speciﬁcation A1016/
A1016M, and Test Method A1047/A1047M.
NOTE 1—Tubes made to Speciﬁcations A179/A179M and A214/
A214M also comply with the general requirements of Speciﬁcation
A450/A450M. Tubes made to Speciﬁcation A334/A334M also comply
with the general requirements of Speciﬁcation A1016/A1016M. Refer-
ence the appropriate general requirements for testing details.
11. Dimensions and Permissible Variations
11.1 Diameter—The outside diameter of the unmodiﬁed
sections and the modiﬁed sections shall not exceed the diam-
eter tolerances as speciﬁed in the governing plain tube speci-
ﬁcation as measured with micrometers and veriﬁed by a “go”
ring gauge. The dimensions of the ring gauge shall be as
described in 11.1.1.
11.1.1 The inside diameter of the “go” ring gauge shall be
equal to the nominal tube diameter, plus the maximum diam-
eter tolerance allowed by the governing plain tube
speciﬁcation, plus 0.002 in. [0.05 mm]. The length of the ring
gauge shall be not less than 1 in. [25 mm].
11.2 Wall Thickness Tolerance—Wall thickness is deﬁned as
the thickness “under the ﬁn groove”, “under the rib groove”, or
the combination of both, as illustrated in Figs. 1-3.
11.2.1 Tubes Ordered to Minimum Wall Thickness at the
Modiﬁed Section—No tube at its thinnest point in the modiﬁed
section shall be less than the minimum speciﬁed wall thick-
ness; nor greater than 18 % over the speciﬁed wall thickness.
11.2.2 Tubes Ordered to Average Wall Thickness at the
Modiﬁed Section—No tube at its thinnest point in the modiﬁed
section shall be less than 9 % under the speciﬁed wall
thickness; nor greater than 9 % over the speciﬁed wall thick-
ness.
11.3 Length Tolerance:
11.3.1 Overall Length—The length of the tubes shall not be
less than that speciﬁed when measured at a temperature of 68
°F [20 °C], but may exceed the speciﬁed value by the amounts
given in Table 1.
11.3.2 Length of Bare Ends—The length of bare ends shall
not be less than speciﬁed, nor
1
⁄
2
in. [13 mm] greater than
speciﬁed.
TABLE 1 Tolerances for Speciﬁed Length of Tubes
Speciﬁed Length, ft [m] Tolerance, in. [mm]
Up to 24 [7.3], incl +
1
⁄
8
[3]
Over 24 to 34 [7.3 to 10.4], incl +
1
⁄
4
[6]
Over 34 to 44 [10.4 to 13.4], incl +
3
⁄
8
[9]
Over 44 [13.4] +
1
⁄
2
[13] max
A498/A498M − 25
3

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摘要：

本页面详细介绍 ASTM A498 - A 498M - 25 标准规范，涵盖带整体翅片的无缝和焊接碳钢热交换器管的制造要求、材质性能、尺寸公差及测试方法。该标准适用于石油、化工、电力等工业领域的高效热交换应用，强调翅片与管体一体化成型以确保传热效率与结构强度。内容包含与 ASTM A498 前版本的对比更新、适用压力范围、焊接与热处理工艺指南，以及常见合规性验证要点，帮助工程师、采购人员与质检团队快速获取符合最新国际规范的技术参考。

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