ASTM A860 - A 860M - 24a 锻造高强度铁素体对接焊接接头的标准规范

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Designation: A860/A860M −24a
Standard Speciﬁcation for
Wrought High-Strength Ferritic Steel Butt-Welding Fittings
1
This standard is issued under the ﬁxed designation A860/A860M; 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 wrought high-strength ferritic
steel butt-welding ﬁttings of seamless and electric fusion-
welded construction. Dimensions of the ﬁttings are provided in
the latest revisions of ASME B16.9 and MSS-SP-75. Butt-
welding ﬁttings differing from ASME B16.9 shall be furnished
in accordance with Supplementary Requirement S58 of Speci-
ﬁcation A960/A960M. These ﬁttings are for use in high-
pressure gas and oil transmission and distribution systems.
1.2 Optional supplementary requirements are provided for
ﬁttings when a greater degree of examination is desired. One or
more of the supplementary requirements may be speciﬁed in
the order.
1.3 This speciﬁcation does not cover cast-welding ﬁttings or
ﬁttings machined from castings.
1.4 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 non-conformance with the
standard. Unless the order speciﬁes the applicable “M” speci-
ﬁcation designation (SI units), the material shall be furnished
to inch-pound units.
1.5 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
A751 Test Methods and Practices for Chemical Analysis of
Steel Products
A960/A960M Speciﬁcation for Common Requirements for
Wrought Steel Piping Fittings
2.2 ASME Standards:
3
B16.9 Steel Butt-Welding Fittings
2.3 ASME Boiler and Pressure Vessel Code:
3
Section V
Section VIII Division 1
Section IX
2.4 MSS Standards:
4
MSS SP-25 The Standard Marking System of Valves,
Fittings, Flanges and Unions
MSS-SP-75 Speciﬁcation for High Test Wrought Butt-
Welding Fittings
2.5 American Society of Nondestructive Testing:
5
SNT-TC-1A Recommended Practice for Nondestructive
Testing Personnel Qualiﬁcation and Certiﬁcation
3. Terminology
3.1 Deﬁnitions of Terms Speciﬁc to This Standard:
3.1.1 Barlow’s Formula—relates the internal pressure that a
pipe can withstand to its dimensions and the strength of its
materials.
3.1.1.1 Discussion—The formula is given in 15.2.
3.2 Deﬁnitions—For deﬁnitions of other terms used in this
speciﬁcation refer to Speciﬁcation A960/A960M.
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
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
Materials for Piping and Special Purpose Applications.
Current edition approved Oct. 15, 2024. Published October 2024. Originally
approved in 1986. Last previous edition approved in 2024 as A860/A860M – 24.
DOI: 10.1520/A0860_A0860M-24A.
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.
3
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
4
Available from Manufacturers Standardization Society of the Valve and Fittings
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
hq.com.
5
Available from American Society for Nondestructive Testing (ASNT), P.O. Box
28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
*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

4. Ordering Information
4.1 See Speciﬁcation A960/A960M.
5. General Requirements
5.1 Product furnished to this speciﬁcation shall conform to
the requirements of Speciﬁcation A960/A960M, including any
supplementary requirements that are indicated in the purchase
order. Failure to comply with the general requirements of
Speciﬁcation A960/A960M constitutes nonconformance with
this speciﬁcation. In case of conﬂict between the requirements
of this speciﬁcation and Speciﬁcation A960/A960M, this
speciﬁcation shall prevail.
6. Materials and Manufacture
6.1 The steel for ﬁttings shall be killed steel melted in
accordance with a ﬁne grain practice. The steel shall be made
by the electric arc furnace, induction melt furnace or basic
oxygen furnace melting processes. These melting processes
may be followed by additional reﬁning in a ladle metallurgy
furnace (LMF). Secondary melting by vacuum-arc remelting
(VAR) or electroslag remelting (ESR) may be used.
6.1.1 The melting practice used is intended to produce
rounded, well dispersed, ﬁne sulphide inclusions. This practice
promotes good notch toughness, assists in the resistance to
hydrogen induced cracking, and results in weldability suitable
for ﬁeld welding.
6.2 Starting materials shall consist of plate, sheet, forgings,
forging quality bar, and seamless or fusion-welded tubular
products with ﬁller metal added. The chemical composition
shall conform to Table 1.
6.3 A starting material that speciﬁcally requires the addition
of any element beyond those listed in Table 1 is not permitted.
This does not preclude the use of deoxidizers.
6.4 Starting material shall not require a preheat for ﬁeld
welding provided that the restrictions of ASME Boiler and
Pressure Vessel Code, Section VIII, Paragraph UW-30 are
complied with.
6.5 Forging or shaping operations may be performed by
hammering, pressing, piercing, extruding, upsetting, rolling,
bending, fusion, welding, machining, or by a combination of
these operations.
6.6 All welds including welds in tubular products from
which the ﬁttings are made shall be:
6.6.1 Made by welders, welding operators, and welding
procedures qualiﬁed under the provisions of ASME Boiler and
Pressure Vessel Code, Section IX.
6.6.2 Heat treated in accordance with Section 7of this
speciﬁcation, and
6.6.3 Radiographically examined throughout the entire
length of each weld in accordance with Articles 1 and 2 of
ASME Boiler and Pressure Vessel Code, Section V with
acceptance limits in accordance with Paragraph UW-51 of
ASME Boiler and Pressure Vessel Code, Section VIII.
6.7 The welded joints of the ﬁttings shall be furnished in
accordance with the requirements of Paragraph UW-35(a) of
ASME Boiler and Pressure Vessel Code, Section VIII.
6.8 All butt-weld tees manufactured by cold-forming meth-
ods shall be liquid penetrant or magnetic particle examined by
one of the methods speciﬁed in Supplementary Requirements
S69 or S70 of Speciﬁcation A960/A960M. This examination
shall be performed in accordance with a written procedure and
shall be performed after ﬁnal heat treatment. Only the side wall
area of the tees need be examined. This area is deﬁned by a
circle that covers the area from the weld bevel of the branch
outlet to the center line of the body or run. Internal and external
surfaces shall be examined when size permits accessibility. No
cracks shall be permitted. Other imperfections shall be treated
in accordance with 13.1 on ﬁnish. After the removal of any
cracks, the tees shall be re-examined by the original method.
Acceptable tees shall be marked with the symbol PT or MT, as
applicable, to indicate compliance. NDE personnel shall be
qualiﬁed in accordance with SNT-TC-1A.
6.9 All caps machined from bar stock shall be examined by
liquid penetrant or magnetic particle in accordance with
Supplementary Requirements S69 or S70 of Speciﬁcation
A960/A960M, and with personnel qualiﬁcations, acceptance
criteria, and marking as in 6.8.
7. Heat Treatment
7.1 All ﬁttings shall be furnished in the heat-treated condi-
tion. Fittings formed above the transformation temperature or
upon which welding is performed, shall be cooled to below the
lower critical temperature prior to heat treatment. Fittings shall
subsequently be heat treated by normalizing, quenching, and
tempering or stress relieving in accordance with Speciﬁcation
A960/A960M.
8. Chemical Composition
8.1 The chemical composition of the steel shall conform to
the requirements prescribed in Table 1.
TABLE 1 Chemical Requirements
Composition %
Heat
Analysis
Carbon 0.20
A
Manganese 1.00–1.45 All values are
Phosphorus 0.030 maximum unless
Sulfur 0.010 a range is stated
Silicon 0.15–0.40
B
Nickel 0.50
C
Chromium 0.30
C
Molybdenum 0.25
C
Copper 0.35
C
Titanium 0.05
Vanadium 0.10
Niobium
D
0.04
Vanadium plus
Niobium
0.12
Aluminum 0.06
A
The carbon equivalent, as calculated by the following formula, shall not exceed
0.42 %:
CE 5C1Mn
61Cr1Mo1V
51Ni1Cu
15
B
If vacuum carbon deoxidation is used, silicon shall not exceed 0.10 % by heat
analysis and 0.12 % by product analysis.
C
The sum of Ni + Cr + Mo + Cu shall not exceed 1.0 %.
D
Niobium and columbium are interchangeable names for the same element and
both names are acceptable for use in A01.22 speciﬁcations.
A860/A860M − 24a
2

8.2 The steel shall not contain any unspeciﬁed elements for
the ordered grade to the extent that it conforms to the
requirements of another grade for which that element is a
speciﬁed element having a required minimum content.
8.3 A heat analysis shall conform to Table 1.
8.4 The ﬁttings manufacturer shall make a product analysis
per heat from either the starting material or from a ﬁtting. The
chemical composition thus determined shall conform to Table
1within the permissible variations included in Speciﬁcation
A960/A960M. The product analysis shall be the basis for
rejection. For referee purposes, Test Methods, Practices, and
Terminology A751 shall apply.
8.5 The carbon equivalent of the base metal, as determined
by the following formula, shall not exceed 0.42 % for the
product analysis:
CE 5C1Mn
61Cr1Mo1V
51Ni1Cu
15
8.6 Weld metal used in the construction of the ﬁttings shall
conform to the tensile and impact requirements of 10.4 and 9.1
after heat treatment in accordance with Section 7. A chemical
analysis shall be performed on deposited weld metal for each
heat of ﬁller metal or, for submerged arc welding, each heat of
ﬁller metal and batch of ﬂux. The weld metal shall be deposited
in accordance with the qualiﬁed weld procedure.
8.7 Only the carbon content of the deposited weld-metal
composition need comply with the requirements of Table 1.
The nickel content of the deposited weld metal shall not exceed
1.0 %.
9. Notch Toughness Properties
9.1 The notch toughness properties of the ﬁttings shall
conform to the requirements listed in Table 2. The testing shall
be performed as speciﬁed in Speciﬁcation A960/A960M. Full
size Charpy, V-notch specimens shall be used whenever
possible. Small size specimens shall be used only when the
material thickness does not permit full size specimens. The
impact specimens shall not be ﬂattened after heat treatment. All
base metal specimens shall be removed with the axis of the
specimens longitudinal to the direction of primary metal ﬂow.
Weld-metal specimens shall be specimens with the axis trans-
verse to the weld seam.
9.2 One set of impact tests (three specimens) shall be made
to represent the base metal and one set (three specimens) to
represent the weld metal on the same frequency as the tension
tests.
9.3 The test temperature shall be −50 °F [−46 °C].
10. Tensile Requirements
10.1 The tensile properties of the ﬁtting material shall
conform to the requirements listed in Table 2.
10.2 Tension test specimens shall be taken from a ﬁtting
after ﬁnal heat treatment or from a test piece of the same heat
and nominal thickness that was heat treated in a furnace charge
with the ﬁttings they represent.
10.3 One tensile test is required for each heat of ﬁttings of
the same section thickness, and heat treated in either a
TABLE 2 Mechanical Requirements
Property Grade
WPHY 42 WPHY 46 WPHY 52 WPHY 60 WPHY 65 WPHY 70
Yield strength, min
A
0.2 % offset, ksi [MPa] 42 [290] 46 [315] 52 [360] 60 [415] 65 [450] 70 [485]
Tensile strength, ksi [MPa] 60 [415] 63 [435] 66 [455] 75 [515] 77 [530] 80 [550]
−85 [585] −88 [605] −91 [625] −100 [690] −102 [705] −105 [725]
Elongation:
Standard round specimen, or small-size proportional
specimen, min, % in 4D
25 25 25 20 20 20
Rectangular specimen, for section thickness
5
⁄
16
in.
[7.94 mm] and over, and for all small sizes tested
in full section; min, % in 2 in. [50 mm].
32 32 32 28 28 28
Rectangular specimen for thickness less than
5
⁄
16
in.
[7.94 mm]; min, % 2 in. [50 mm]. Width of specimen
1
1
⁄
2
in. [40 mm].
B B B B B B
Toughness:
C
v
energy absorption
C
; measured at −50 °F [−46 °C].
Size, mm Average/min, ft·lbs[J] Lateral Expansion min, MLS[mm]
10× 10 30/25 [40/34] 25 [0.64]
10× 7.5 25/21 [34/28] 21 [0.53]
10× 5 20/17 [27/23] 13 [0.33]
A
Actual yield strength shall not exceed speciﬁed minimum by more than 15 ksi [105 MPa].
B
Equation for calculating elongation for strip specimens thinner than
5
⁄
16
in. [7.94 mm] min % in 2 in. [50 mm]:
t= actual thickness
For Grade WPHY52 and less For Grade WPHY60 and greater
Inch-pound units (in.) 48t+ 17 48t+ 13
SI units [mm] 1.9t+ 17 1.9t+ 13
C
These requirements are intended to minimize fracture initiation. The requirements are not intended to give assurance against fracture propagation.
A860/A860M − 24a
3

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标签： #接头 #铁素体 #高强度

摘要：

了解ASTM A860 - A 860M - 24a标准规范，该规范针对适用于高温高压管道系统的锻造高强度铁素体对接焊接接头，涵盖材料化学成分、力学性能、热处理要求及制造工艺等关键技术指标。该标准适用于符合ASME B16.9标准的无缝及焊接管件，确保其在石油、化工、电力等工业领域的安全可靠性。通过严格的质量控制与测试要求，该规范为高屈服强度铁素体钢件的选用提供了权威依据，助力工程采购与设计决策，有效提升管道系统的整体运行效率与使用寿命。

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ASTM A860 - A 860M - 24a 锻造高强度铁素体对接焊接接头的标准规范

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