ASTM A571/A571M-01

Standard Specification for Austenitic Ductile Iron Castings for Pressure-Containing Parts Suitable for Low-Temperature Service

SCOPE
1.1 This specification covers austenitic ductile iron, Type D-2M, Classes 1 and 2, for compressors, expanders, pumps, valves, and other pressure-containing parts intended primarily for low-temperature service.
1.2 These grades of austenitic ductile iron are characterized by having their graphite substantially in a spheroidal form and free of flake graphite. They are essentially free of carbides and contain sufficient alloy content to produce a stable austenitic matrix down to 423°F [252°C] (liquid hydrogen).
1.3 The values stated in either inch-pound 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 shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.4 The following precautionary caveat pertains only to the test methods portion, Section 11, 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Nov-2001
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.02 - Malleable and Ductile Iron Castings

Relations

• Replaced By: ASTM A571/A571M-01(2006) - Standard Specification for Austenitic Ductile Iron Castings for Pressure-Containing Parts Suitable for Low-Temperature Service
• Effective Date: 01-Jun-2006
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 10-Nov-2001

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 571/A 571M – 01
Standard Specification for
Austenitic Ductile Iron Castings for Pressure-Containing
Parts Suitable for Low-Temperature Service
ThisstandardisissuedunderthefixeddesignationA571/A571M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope E30 Test Methods for Chemical Analysis of Steel, Cast
2 Iron, Open-Hearth Iron, and Wrought Iron
1.1 This specification covers austenitic ductile iron, Type
E59 PracticeforSamplingSteelandIronforDetermination
D-2M, Classes 1 and 2, for compressors, expanders, pumps,
of Chemical Composition
valves, and other pressure-containing parts intended primarily
for low-temperature service.
3. Ordering Information
1.2 These grades of austenitic ductile iron are characterized
3.1 Ordersformaterialunderthisspecificationshallinclude
by having their graphite substantially in a spheroidal form and
the following information:
free of flake graphite.They are essentially free of carbides and
3.1.1 Quantity (weight or number of pieces),
contain sufficient alloy content to produce a stable austenitic
3.1.2 ASTM designation and year of issue,
matrix down to −423°F [−252°C] (liquid hydrogen).
3.1.3 Material class (Table 1),
1.3 The values stated in either inch-pound or SI units are to
3.1.4 Impact test temperature requirement (Section 11),
beregardedseparatelyasstandard.Withinthetext,theSIunits
3.1.5 Place of inspection (Section 13), and
areshowninbrackets.Thevaluesstatedineachsystemarenot
3.1.6 Certification requirements (Section 14).
exact equivalents; therefore, each system shall be used inde-
pendentlyoftheother.Combiningvaluesfromthetwosystems
4. Materials and Manufacture
may result in nonconformance with the specification.
4.1 Material—The iron shall be made in the electric-arc
1.4 The following precautionary caveat pertains only to the
furnace, induction furnace, cupola, or any other furnace which
test methods portion, Section 11, of this specification: This
is capable of producing castings meeting the chemical compo-
standard does not purport to address all of the safety concerns,
sitions and mechanical properties in this specification.
if any, associated with its use. It is the responsibility of the user
4.2 Heat Treatment:
of this standard to establish appropriate safety and health
4.2.1 All castings shall be heat treated.
practices and determine the applicability of regulatory limita-
4.2.2 Heat treatment shall be performed before machining
tions prior to use.
except in instances when reheat treating is necessary.
4.2.3 Heat treatment shall consist of annealing. The proce-
2. Referenced Documents
dure for this type treatment shall consist of heating the casting
2.1 ASTM Standards:
to a minimum of 1600°F [870°C] but not greater than 1800°F
A941 Terminology Relating to Steel, Stainless Steel, Re-
3 [980°C]holdingatthattemperaturenotlessthan1h/in.[1h/25
lated Alloys, and Ferroalloys
4 mm] of section and furnace cooling. (SeeTerminologyA941.)
E8 TestMethodsforTensionTestingofMetallicMaterials
E23 Test Methods for Notched Bar Impact Testing of
5. Chemical Requirements
Metallic Materials
5.1 Drillings taken from test coupons, broken test speci-
mens or castings shall conform to the requirements as to
chemical composition prescribed in Table 2.
This specification is under the jurisdiction of the ASTM Committee A04 on
Iron Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable
and Ductile Iron Castings.
Current edition approved Nov. 10, 2001. Published January 2002. Originally
published as A571–66. Last previous edition A571–84 (1997).
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-571 in Section II of that code. Annual Book of ASTM Standards, Vol 03.05.
3 6
Annual Book of ASTM Standards, Vol 01.01. Discontinued.See1995AnnualBookofASTMStandards,Vol03.05.(Replaced
Annual Book of ASTM Standards, Vol 03.01. by E1806, Vol 03.06.)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 571/A 571M – 01
A
TABLE 1 Mechanical Property Requirements
Class 1 Class 2 Class 3 Class 4
Tensile Strength, min, ksi [mPa] 65 60 [450] [415]
B
Yield Strength 0.2 % (offset), min, ksi [mPa] 30 25 [205] [170]
Elongation, min, % 30 25 30 25
Brinell Hardness, 3000 kg [kgf] 121–171 111–171 121–171 111–171
Charpy V-notch, ft·lbf [J]
min, average 3 tests 15 20 [20] [27]
C
min, individual test 12 15 [16] [20]
A
Heat-treated condition.
B
Yield Strength shall be determined at 0.2 % offset by the offset method, see Test Methods E 8. Other methods may be agreed upon by mutual consent of manufacturer
and purchaser.
C
Not more than one test in a set of three may be below the minimum average required for the set of three.
TABLE 2 Chemical Requirements
8. Sampling
8.1 The standard test coupons shall be the 1-in. [25-mm]
Element Composition, %
“Y”blockand1-in.[25-mm]keelblockasshowninFig.1and
A
Fig. 2, respectively.
Total carbon 2.2–2.7
Silicon 1.5–2.50
8.2 The separately cast test coupons from which the tension
Manganese 3.75–4.5
test specimens are machined shall be cast to the size and shape
Nickel 21.0–24.0
B
shown in Fig. 1 or Fig. 2. The size of coupon cast to represent
Chromium 0.20 max
Phosphorus 0.08 max
the casting shall be at the option of the purchaser. In case no
A 1
For castings with sections under ⁄4 in. [6 mm], it may be desirable to adjust the
option is expressed, the manufacturer shall make the choice.
carbon upwards to a maximum of 2.90 %.
8.3 Test coupons shall be poured immediately after the
B
Not intentionally added.
castings and from the same ladle of metal. Test coupons shall
be left in the mold until they have cooled black. Test coupons
shall be included in the same furnace load as the castings they
5.2 The chemical analysis for total carbon shall be made on
represent (see Fig. 3).
either chilled cast pencil-type specimens or thin wafers ap-
proximately ⁄32-in. [0.8-mm] thick cut from test coupons.
9. Number of Tests and Retests
Drillings shall not be used because of attendant loss of
9.1 Test coupons shall be poured from each ladle treated
graphite.
with nodulizing agent unless otherwise specified.
6. Physical Property Requirements
6.1 Tensile Properties—The room temperature mechanical
propertiesofthetwoclassesofductileironusedforthecasting
shallconformtotherequirementsfortheheat-treatedcondition
shown in Table 1.
6.2 Impact Properties—The notched-bar impact properties
of the materials shall be determined by testing a set of three
Charpy V-notch impact specimens to the energy absorption
requirements shown in Table 1. The test temperature shall be
agreeduponbythemanufacturerandthepurchaser.Theenergy
absorption value shown in Table 1 are applicable at tempera-
tures down to and including −320°F [−195°C].
6.3 Brinell Hardness—The room temperature hardness of
“Y’’ Block Size
test bars and castings shall conform to the requirements of
“Y” Block Size
Table 1.
For Castings For Castings For Castings
Dimen- of Thickness of Thickness of Thickness
1 1 1 1
7. Workmanship, Finish, and Appearance
sions Less Than ⁄2 ⁄2 to 1 ⁄2 in. of 1 ⁄2 in. [40 mm]
in. [12.5 mm] [12.5 to 40 mm] and Over
7.1 The castings shall conform to the dimensions and
in. [mm] in. [mm] in. [mm]
tolerances on the drawings furnished by the purchaser, or if no
A ⁄2 [12.5] 1 [25] 3 [75]
drawing has been provided, to the dimensions predicated by
B 1 [25] 2 ⁄8 [55] 5 [125]
thepatternsuppliedbythepurchaser.Thecastingsshallbefree
C 2 [50] 3 [75] 4 [100]
from injurious defects. Surfaces of the castings shall be free of D 4 [100] 6 [150] 8 [200]
E 7 [175] 7 [175] 7 [175]
burnt-on sand and shall
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