ASTM A758/A758M-00

Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness

SCOPE
1.1 This specification covers wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness than that to be expected in fittings manufactured to the requirements of Specification A234/A234M.
1.1.1 Included are elbows, caps, tees, reducers, and other type fittings covered by ASME B 16.9.
1.1.2 Heat treatment is required for all fittings.
1.1.3 Fittings with mandatory radiographic examination of welds are included.
1.1.4 Supplementary requirements are provided for use when additional testing or examination is desired.
1.1.5 Cast fittings, and fittings formed from all weld metal, are not included.
1.2 Several type of fittings are provided, as follows:Type Heat Treatment RequiredWeld Seam Finish ()Radiography Required? 30 normalize UW-35 no 31 normalize UW-35 yes 32 normalize UW-35 and ground flush yes40 normalize and temperUW-35 no 41 normalize and temperUW-35 yes 42 normalize and temperUW-35 and ground flush  yes 50 quench and temperUW-35 no 51 quench and temperUW-35 yes 52 quench and temperUW-35 and ground flush  yes  
1.3 It shall be the responsibility of the purchaser to determine whether material meeting the requirements of this specification is satisfactory for the service application.
1.4 This specification is expressed in both inch-pound units and SI units. However, unless the order specifies the applicable "M" specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 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 are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 09-Sep-2000
• ICS: 23.040.40 - Metal fittings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.22 - Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications

Relations

• Replaced By: ASTM A758/A758M-00(2005) - Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
• Effective Date: 10-Sep-2000
• Referred By: ASTM A960/A960M-23 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 10-Sep-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 758/A 758M – 00
Standard Specification for
Wrought-Carbon Steel Butt-Welding Piping Fittings with
Improved Notch Toughness
This standard is issued under the fixed designationA 758/A 758M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
1.1 This specification covers wrought-carbon steel butt-
be used independently of the other. Combining values from the
welding seamless or welded fittings specially processed to
two systems may result in nonconformance with the specifi-
ensure better notch toughness than that to be expected in
cation.
fittings manufactured to the requirements of Specification
A 234/A 234M.
2. Referenced Documents
1.1.1 Included are elbows, caps, tees, reducers, and other
2.1 In addition to those reference documents listed in
type fittings covered by ASME B 16.9.
Specification A 960, the following list of standards apply to
1.1.2 Heat treatment is required for all fittings.
this specification:
1.1.3 Fittings with mandatory radiographic examination of
2.2 ASTM Standards:
welds are included.
A 234/A 234M Specification for Piping Fittings ofWrought
1.1.4 Supplementary requirements are provided for use
Carbon Steel and Alloy Steel for Moderate and Elevated
when additional testing or examination is desired.
Temperatures
1.1.5 Cast fittings, and fittings formed from all weld metal,
A 275/A 275M Test Method for Magnetic Particle Exami-
are not included.
nation of Steel Forgings
1.2 Several type of fittings are provided, as follows:
A 370 Test Methods and Definitions for MechanicalTesting
Heat Treatment Weld Seam Radiography
of Steel Products
Type Required Finish (5.3.2) Required?
A 960 Specification for Common Requirements for
30 normalize UW-35 no
Wrought Steel Piping Fittings
31 normalize UW-35 yes
E 165 Practice for Liquid Penetrant Inspection Method
32 normalize UW-35 and ground flush yes
40 normalize and temper UW-35 no
E 709 Practice for Magnetic Particle Examination
41 normalize and temper UW-35 yes
2.3 ASMEBoilerandPressureVesselCode(ASMECode):
42 normalize and temper UW-35 and ground flush yes
Section VIII, Division 1 Pressure Vessels
50 quench and temper UW-35 no
51 quench and temper UW-35 yes
Section IX, Welding and Brazing Qualifications
52 quench and temper UW-35 and ground flush yes
2.4 ASME Standard:
1.3 It shall be the responsibility of the purchaser to deter-
B 16.9 Standards for Steel Butt-Welding Fittings
mine whether material meeting the requirements of this speci- 2.5 ASNT Standard:
fication is satisfactory for the service application.
SNT-TC-1A-1984 Practice for Nondestructive Examination
1.4 This specification is expressed in both inch-pound units Personnel Qualification and Certification
and SI units. However, unless the order specifies the applicable
3. Ordering Information
“M” specification designation (SI units), the material shall be
furnished to inch-pound units. 3.1 See Specification A 960.
1.5 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
Annual Book of ASTM Standards, Vol 01.01.
Annual Book of ASTM Standards, Vol 01.05.
1 4
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Annual Book of ASTM Standards, Vol 01.03.
Stainless Steel, and RelatedAlloys, and is the direct responsibility of Subcommittee Annual Book of ASTM Standards, Vol 03.03.
A01.22 on Steel Forgings and Wrought Fittings for PipingApplications and Bolting Available from ASME International, Three Park Avenue, New York, NY
Materials for Piping and Special Purpose Applications. 10016–5990.
Current edition approved Sept. 10, 2000. Published December 2000. Originally Available from American Society for Nondestructive Testing, 1711 Arlingate
Plaza, P.O. Box 28518, Columbus, OH 43228-0518.
published as A 758 – 78. Last previous edition A 758/A 758M – 98.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 758/A 758M – 00
TABLE 1 Chemical Requirements
4. General Requirements
4.1 Product furnished to this specification shall conform to
Element Cast or Heat Product
the requirements of SpecificationA 960, including any supple-
Analysis Analysis
mentary requirements that are indicated in the purchase order.
Carbon, max, % 0.27 0.30
Manganese, % 0.85–1.20 0.75–1.25
Failure to comply with the requirements of SpecificationA 960
Phosphorus, max, % 0.035 0.040
constitutes non-conformance with this specification. In case of
Sulfur, max, % 0.035 0.040
a conflict between the requirements of this specification and
Silicon, % 0.15–0.30 0.13–0.33
Vanadium, max, % 0.05 0.05
Specification A 960, this specification shall prevail.
A,B
Residual elements
Chromium, max, % 0.25 0.25
5. Materials and Manufacture
Nickel, max, % 0.25 0.25
Molybdenum, max, % 0.08 0.08
5.1 The steel shall be killed and shall be melted to a fine
Copper, max, % 0.35 0.35
austenitic grain size practice.
Lead, max, % 0.05 0.05
5.2 Thestartingmaterialshallbewroughtandintheformof A
Individual limits of chromium, nickel, molybdenum, and copper may be
exceeded by 0.05 % provided that their total does not exceed 0.90 % in both the
blooms, billets, slabs, forgings, bars, plates, sheets, seamless
heat and product analysis.
pipe or tube, or welded-with-filler-metal pipe or tube. Cast
B
These are not to be added to the melt and shall only occur as a result of
products shall not be used.
unavoidable residuals from the melting stock.
5.3 Any forming process, fusion-welding process, or com-
bination of such processes, may be used.
6.2 ProductAnalysis—Productanalysismaybemadebythe
5.3.1 All welding shall be fusion-welded in accordance with
purchaser.Theresultsshallconformtotherequirementsforthe
the requirements of Section IX of the ASME Code. Welding
applicable grade as specified in Table 1.
procedures, welders, and welding operators shall be qualified
6.3 The steel shall not contain any unspecified elements for
in accordance with Section IX.
the ordered grade to the extent that it conforms to the
5.3.2 All welded joints shall be finished in accordance with
requirements of another grade for which that element is a
Paragraph UW-35 of Section VIII, Division 1, of the ASME
specified element having a required minimum content.
Code.
5.3.3 Welded joints of Type 32, 42, and 52 shall be ground
7. Mechanical Requirements
flush.
7.1 Tensile Requirements:
5.3.4 Welded joints ofTypes 31, 41, 51, 32, 42, and 52 shall
7.1.1 The fittings, as represented by tensile test specimens
be examined by radiography in accordance with the require-
taken subsequent to final heat treatment, shall conform to the
ments of Paragraph UW-51 of Section VIII, Division 1, of the
requirements for the applicable grade as specified in Table 2.
ASME Code, and shall conform to the requirements of
7.1.2 Number and Location of Specimens:
Paragraph UW-51.
7.1.2.1 Lot—For tension testing, a lot shall consist of the
5.4 Heat Treatment—All fittings shall be heat treated sub-
fittings from a heat, in each heat treatment charge, with
sequent to final welding and forming.
nominal wall thicknesses within ⁄4 in. [6 mm] of the nominal
5.4.1 Types 30, 31, and 32 fittings shall be normalized by
thickness of the test specimen. In addition, for Types 32, 42,
uniformly heating to a temperature in the austenitizing range,
and 52, the lot definition shall include each heat or lot of weld
but not to exceed 1700°F [925°C], and subsequently removed
metal. If heat treatment is performed in a continuous or
from the furnace and air-cooled individually to room tempera-
batch-type furnace controlled within a range of plus-or-minus
ture.
25°F [14°C] and equipped with calibrated thermocouples and
5.4.2 Types 40, 41, and 42 fittings shall be normalized in
recording pyrometers, and records of heat treatment are main-
accordance with 5.4.1. After normalizing, the fittings shall be
tained, all fittings heat treated in such a furnace are considered
tempered by heating to a temperature in the range from 1100°F
to be in one charge. For furnaces not so equipped and
to 1200°F [595°C to 675°C], soaking at that temperature for ⁄2
controlled, each batch constitutes a charge.
h minimum per 1 in. [25 mm] of thickness, but not less than 15
7.1.2.2 Representative Test Piece—For instances in which
min, and then air-cooled to room temperature.
the tension test specimen cannot be obtained from a fitting due
5.4.3 Types 50, 51, and 52 fittings shall be quenched-and-
to size limitations, a representative test piece may be used.The
tempered by uniformly heating to a temperature in the auste-
test piece shall be from the same heat and shall be heat treated
nitizing range, but not to exceed 1700°F [925°C], and then
quenching in a liquid media from the austenitizing temperature
TABLE 2 Tensile Requirements
to a temperature below 800°F [425°C]. After quenching, the
fittings shall be reheated to a temperature in the range from
Grade 60 Grade 70
1100°F to 1250°F [595°C to 675°C], soaking at that tempera-
Tensile strength, ksi [MPa] 60 to 85 [415 to 585] 70 to 95 [485 to 635]
ture for ⁄2 h minimum per 1 in. [25 mm] of thickness, but not
A
Yield strength, min, ksi 35 [240] 38 [260]
less than 15 min, and then air-cooled to room temperature.
[MPa]
Elongation in 2 in. [50 mm],
min, %
6. Chemical Composition
Longitudinal 30 27
Transverse 22 20
6.1 HeatorCastAnalysis—Theresultsshallconformtothe
A
requirements for the applicable grade as specified in Table 1. 0.2 % offset or 0.5 % EUL.
A 758/A 758M – 00
in the same heat treatment batch or charge as the fittings it 10. Radiographic Examination
represents, and shall have had approximately the same amount
10.1 Types 31, 32, 41, 42, 51, and 52 fittings shall have the
of working as the fittings. In addition, for fittings manufactured
entire length of each weld joint examined radiographically in
from bars, plate, or forgings, the test piece shall have a
accordance with Paragraph UW-51 of SectionVIII, Division 1,
c
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