ASTM A1065 - A 1065M - 18 (2025) 冷成型电熔（电弧）焊接高强度低合金结构钢管标准规范（最小屈服点为50 ksi [345 MPa]）

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Designation: A1065/A1065M −18 (Reapproved 2025)
Standard Speciﬁcation for
Cold-Formed Electric-Fusion (Arc) Welded High-Strength
Low–Alloy Structural Tubing in Shapes, with 50 ksi [345
MPa] Minimum Yield Point
1
This standard is issued under the ﬁxed designation A1065/A1065M; 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 three Types and two Grades of
cold formed electric-fusion (arc) welded high-strength low-
alloy steel tubing of 50 ksi [345 MPa] minimum yield point for
use in welded or bolted construction of buildings and for
general structural purposes.
1.2 This tubing is produced in square and rectangular sizes
with a periphery of 200 in. [500 cm] or less and a speciﬁed wall
thickness of 1.00 in. [25 mm] or less. Tubes are joined by two
longitudinal electric-fusion (arc) welds. Circumferential welds
are disallowed. Sizes outside of those listed in Tables 4 and 5
may be ordered provided all other requirements of the speci-
ﬁcation are met. Typical lengths are 15 to 50 ft [5 to 15 m].
NOTE 1—Products manufactured to this speciﬁcation may not be
suitable for those applications such as dynamically loaded elements in
welded structures, etc. where low-temperature toughness properties may
be important. (See Supplementary Requirement S1.)
1.3 This speciﬁcation covers the following Types:
1.3.1 Type 1—Welded with backing, backing left in the
product,
1.3.2 Type 2—Welded with backing, backing removed,
1.3.3 Type 3—Welded without backing.
1.4 Tubing is available in Grades 50 [345] and 50W
[345W]. Grade 50 [345] is manufactured from high-strength
low-alloy steel. Grade 50W [345W] is manufactured from
high-strength low-alloy steel with enhanced atmospheric cor-
rosion resistance. (See 10.1.2) The Grades may not be inter-
changed without approval of the purchaser. ASTM Speciﬁca-
tions for plate that may be applied to Grade 50 [345] and 50W
[345W] are listed in Reference Documents and in Table 1.
1.5 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 SI
units or inch-pound 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 noncon-
formance with the standard.
1.6 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 appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.7 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
A6/A6M Speciﬁcation for General Requirements for Rolled
Structural Steel Bars, Plates, Shapes, and Sheet Piling
A242/A242M Speciﬁcation for High-Strength Low-Alloy
Structural Steel
A572/A572M Speciﬁcation for High-Strength Low-Alloy
Columbium-Vanadium Structural Steel
A588/A588M Speciﬁcation for High-Strength Low-Alloy
Structural Steel, up to 50 ksi [345 MPa] Minimum Yield
Point, with Atmospheric Corrosion Resistance
A656/A656M Speciﬁcation for Hot-Rolled Structural Steel,
High-Strength Low-Alloy Plate with Improved Formabil-
ity
A700 Guide for Packaging, Marking, and Loading Methods
for Steel Products for Shipment
A709/A709M Speciﬁcation for Structural Steel for Bridges
A941 Terminology Relating to Steel, Stainless Steel, Related
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 Sept. 1, 2025. Published September 2025. Originally
approved in 2009. Last previous edition approved in 2018 as A1065/A1065M – 18.
DOI: 10.1520/A1065_A1065M-18R25.
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.
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

Alloys, and Ferroalloys
A945/A945M Speciﬁcation for High-Strength Low-Alloy
Structural Steel Plate with Low Carbon and Restricted
Sulfur for Improved Weldability, Formability, and Tough-
ness
G101 Guide for Estimating the Atmospheric Corrosion Re-
sistance of Low-Alloy Steels
2.2 AWS Standard
3
AWS D1.1 Structural Welding Code-Steel
2.3 Military Standard
4
MIL-STD-129 Marking for Shipment and Storage
2.4 Federal Standard
4
Fed. Std. No. 123 Marking for Shipment
2.5 Steel Tube Institute
5
Hollow Structural Sections
2.6 AISC
6
Manual of Steel Construction
3. Terminology
3.1 Deﬁnitions—For deﬁnitions of terms used in this
speciﬁcation, refer to Terminology A941.
3.2 Deﬁnitions of Terms Speciﬁc to This Standard:
3.2.1 HSS
5
,n—a Hollow Structural Section is a cold-formed
welded steel tube used for welded or bolted construction of
buildings, bridges and other structures.
3.2.2 electric fusion (arc) welded, n—a welding process that
uses an electric arc as the source of heat to melt and join
metals.
3.2.3 weld reinforcement, n—that portion of the weld seam
above the plane of the plate surface.
4. Ordering Information
4.1 Orders for material under this speciﬁcation shall contain
the following mandatory information:
4.1.1 Size (outside dimensions, thickness and length),
4.1.2 Name Cold Formed Arc Welded HSLA Structural
Tubing,
4.1.3 Quantity (number of lengths of each size),
4.1.4 Type (1, 2, or 3),
4.1.5 Grade 50 [345] or Grade 50W [345W],
4.1.6 Individual supplementary requirements, if required
(Supplementary Requirements S1 to S4, inclusive).
5. Manufacture
5.1 The steel from which the tubing is made shall conform
to Speciﬁcations A242/A242M,A572/A572M,A588/A588M,
A656/A656M,A709/A709M, or A945/A945M. The Speciﬁ-
cations are identiﬁed in Table 1 according to Grade 50 [345] or
Grade 50W [345W]. The choice of Grade and ASTM Standard
steel material is at the manufacturer’s option unless identiﬁed
in the purchase order (See Supplementary Requirement S3).
5.2 Two equally shaped pieces of ﬂat-rolled plate product of
the same ASTM plate speciﬁcation shall be press brake formed
into halves of the ﬁnished size. Types 1 and 2 tubing shall have
continuous backup bars tack welded to each leg of one of the
half-sections. The two half sections shall be ﬁtted together and
arc welded with two seam welds to complete the tubing. Type
2 tubing shall have the backing removed after seam welding.
Type 3 tubing shall be manufactured without backup bars.
5.3 The electric-fusion (arc) weld shall be deposited by the
submerged arc welding process, ﬂux cored arc welding process
or gas metal arc welding process. The electrode shall be of
matching strength.
5.4 Grade 50W [345W] backing shall be enhanced atmo-
spheric corrosion resistant material. The electrode shall comply
with atmospheric corrosion resistance requirements.
5.5 The standard weld shall be a partial joint penetration
Single-V-groove weld with groove depth not less than eighty
percent of the material thickness. For complete joint penetra-
tion welds, see Supplementary Requirement S2.
5.6 The seam welds shall join the smaller ﬂat sides of the
structural section. (See Supplementary Requirement S4 for the
option of joining the larger ﬂat sides).
5.7 Welding shall be in accordance with AWS D1.1, latest
edition.
6. Material
6.1 Table 1 identiﬁes ASTM high-strength low-alloy stan-
dard speciﬁcation steel from which the tubing shall be manu-
factured. Some Speciﬁcations have more than one Grade or
Type. The Speciﬁcations provide chemical compositions.
7. Mechanical Properties
7.1 The material as represented by the steel producer shall
conform to the requirements of Table 2.
3
Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
Miami, FL 33126, http://www.aws.org.
4
Available from Global Engineering Documents, 15 Inverness Way, East
Englewood, CO 80112-5704, http://www.global.ihs.com.
5
Available from Steel Tube Institute of North America, 2000 Ponce de Leon,
Suite 600, Coral Gables, FL 33134.
6
Available from American Institute of Steel Construction (AISC), One E.
Wacker Dr., Suite 700, Chicago, IL 60601-2001, http://www.aisc.org.
TABLE 1 ASTM Plate Speciﬁcations
A
Grade 50 [345] A572/A572M,A656/A656M,A709/
A709M,A945/A945M
Grade 50W [345] A242/A242M,A588/A588M,A709/
A709M HPS 50W
A
Individual speciﬁcations may have more than one Grade or Type and provide
chemical requirements.
TABLE 2 Tensile Requirements
Grade 50 [345] Grade 50W [345W]
Tensile strength, min,
psi [MPa]
60 000 [415] 70 000 [480]
Yield strength, min, psi
[MPa]
50 000 [345] 50 000 [345]
Elongation in 2 in. [50
mm], min. %
21 21
A1065/A1065M − 18 (2025)
2

8. Permissible Variations in Dimensions

8.1 Outside Dimensions—The outside dimensions measured

across the ﬂats at positions at least 2 in. [50 mm] from the ends

of the tubing shall not vary from the speciﬁed outside dimen-

sions by more than the applicable amount given in Table 3.

Measurement shall not include the weld reinforcement. Table 3

includes allowances for convexity and concavity.

8.2 Thickness—The permissible variation in wall thickness

shall be +0.03/-0.01in. [+0.76/-0.25 mm] (Table 1 of Speciﬁ-

cation A6/A6M).

8.3 Length—The permissible variation for length shall be

+6/-0 in. [+150/-25 mm].

8.4 Straightness—The permissible variation for straightness

shall be

⁄

in. times the number of feet [10.4 mm times the

number of metres] of total length divided by 5.

8.5 Squareness of Sides—Adjacent sides shall be square

(90°), with a permissible variation of 62° max.

8.6 Radius of Corners—Corners shall be bent with an

outside-bend radius three times the thickness (3t) or greater.

8.7 Twist—The permissible twist shall not exceed 0.125 in.

per 3 ft [3 mm per metre] of length. Twist shall be determined

by holding one end of the tubing down on a ﬂat surface plate,

measuring the height that each corner on the bottom side of the

tubing extends above the surface plate near the opposite ends

of the tubing, and calculating the twist (difference in heights of

the corners). For heavier sections it shall be permissible to use

a suitable measuring device to determine twist. Twist measure-

ments shall not be taken within 2 in. [50 mm] of the ends of the

tubing.

TABLE 3 Permissible Variations in Outside Flat Dimensions

Nominal Outside Large Flat Dimension Permissible Variation Over and Under Nominal Outside Flat Dimensions

Squares and rectangles with a large ﬂat to small ﬂat ratio less than 3.0 0.015 times each ﬂat dimension

Rectangles with a large ﬂat to small ﬂat ratio equal to or greater than 3.0 0.02 times each ﬂat dimension

TABLE 4 Wall Thicknesses for Square Shapes

Wall in./mm 0.313 [8] 0.375 [10] 0.500 [13] 0.625 [16] 0.750 [19] 1.000 [25]

Outside Dimensions

in./mm

12 × 12 [300 × 300] X X X X X X

13 × 13 [330 × 330] X X X X X X

14 × 14 [360 × 360] X X X X X X

15 × 15 [380 × 380] X X X X X X

16 × 16 [410 × 410] X X X X X X

17 × 17 [430 × 430] X X X X X X

18 × 18 [460 × 460] X X X X X X

19 × 19 [480 × 480] X X X X X X

20 × 20 [510 × 510] X X X X X X

21 × 21 [530 × 530] X X X X X

22 × 22 [560 × 560] X X X X X

23 × 23 [580 × 580] X X X X X

24 × 24 [610 × 610] X X X X X

25 × 25 [640 × 640] X X X X X

26 × 26 [660 × 660] X X X X X

27 × 27 [690 × 690] X X X X X

28 × 28 [710 × 710] X X X X X

29 × 29 [740 × 740] X X X X X

30 × 30 [760 × 760] X X X X X

31 × 31 [790 × 790] X X X X

32 × 32 [810 × 810] X X X X

33 × 33 [840 × 840] X X X X

34 × 34 [860 × 860] X X X X

35 × 35 [890 × 890] X X X X

36 × 36 [910 × 910] X X X X

37 × 37 [940 × 940] X X X X

38 × 38 [970 × 970] X X X X

39 × 39 [990 × 990] X X X

40 × 40 [1020 × 1020] X X X

41 × 41 [1040 × 1040] X X X

42 × 42 [1070 × 1070] X X X

43 × 43 [1090 × 1090] X X X

44 × 44 [1120 × 1120] X X X

45 × 45 [1140 × 1140] X X X

46 × 46 [1170 × 1170] X X X

47 × 47 [1190 × 1190] X X X

48 × 48 [1220 × 1220] X X X

Consult the producer for weight per foot calculations.

A1065/A1065M − 18 (2025)

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摘要：

本文档详细介绍了ASTM A1065 - A 1065M - 18 (2025)标准规范，该标准适用于冷成型电熔（电弧）焊接的高强度低合金结构钢管，其最小屈服点要求为50 ksi（约345 MPa）。该规范涵盖的材料主要用于建筑、桥梁、塔架及其他对强度和耐久性有较高要求的钢结构工程，旨在确保钢管在成形、焊接及使用过程中的力学性能、化学成分和尺寸公差符合国际标准。文档中明确了钢管的制造工艺、测试方法、检验标准以及标记要求，为工程师、制造商和质检人员提供了全面的技术指导。通过遵循该标准，用户能够有效

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ASTM A1065 - A 1065M - 18 (2025) 冷成型电熔（电弧）焊接高强度低合金结构钢管标准规范（最小屈服点为50 ksi [345 MPa]）

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