ASTM A958-00(2006)
(Specification)Standard Specification for Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades
Standard Specification for Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades
ABSTRACT
This specification covers carbon and low-alloy steel castings. The steel specimens shall be heat treated and shall conform to the required values of austenitizing temperature and tempering temperature. The steel materials shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, and molybdenum. Tensile tests shall be performed and the steel specimens shall conform to the required values of tensile strength, yield strength, and elongation.
SCOPE
1.1 This specification covers carbon and low-alloy steel castings having chemical analyses similar to that of the standard wrought grades.
1.2 Several classes are covered and are designated by chemical composition as shown in .
1.3 Options for tensile properties are shown in .
1.4 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. Inch-pound units are applicable for material ordered to Specification A 958 and SI units for material ordered to Specification A 958.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A958 – 00 (Reapproved 2006)
Standard Specification for
Steel Castings, Carbon and Alloy, with Tensile
Requirements, Chemical Requirements Similar to Standard
Wrought Grades
This standard is issued under the fixed designation A958; 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 3. General Conditions for Delivery
1.1 This specification covers carbon and low-alloy steel 3.1 Material furnished to this specification shall conform to
castings having chemical analyses similar to that of the the requirements of SpecificationA781/A781M, including any
standard wrought grades. supplementary requirements that are indicated in the purchase
1.2 Several classes are covered and are designated by order. Failure to comply with the general requirements of
chemical composition as shown in Table 1. Specification A781/A781M constitutes nonconformance with
1.3 Options for tensile properties are shown in Tables 2 and this specification. In case of conflict between the requirements
3. of this specification and Specification A781/A781M, this
1.4 The values stated in either inch-pound units or SI units specification shall prevail.
are to be regarded separately as standard. Within the text, the
4. Ordering Information
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must 4.1 Orders for material under this specification should
include the following information.
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifica- 4.1.1 Quantity,
4.1.2 Specification, including year and date of issue,
tion. Inch-pound units are applicable for material ordered to
Specification A958 and SI units for material ordered to 4.1.3 Grade and class of steel,
4.1.4 Description of the casting by pattern number or
Specification A958.
drawing (Dimensional tolerances should be included on the
2. Referenced Documents
casting drawing.),
2.1 ASTM Standards: 4.1.5 Options in the specification, and
A370 Test Methods and Definitions for Mechanical Testing 4.1.6 Supplementary requirements desired, including stan-
of Steel Products dards of acceptance.
A488/A488M Practice for Steel Castings, Welding, Quali-
5. Heat Treatment
fications of Procedures and Personnel
5.1 All castings shall receive a heat treatment indicated in
A781/A781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use Table 4. Preliminary heat treatment prior to final heat treatment
as well as multiple tempering is permitted.
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications 5.2 Heat treatment shall be performed after the castings
have been allowed to cool below the transformation range.
5.3 The furnace temperature for heat treating shall be
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
effectively controlled by the use of recording-type pyrometers.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
6. Chemical Composition
Current edition approved March 1, 2006. Published March 2006. Originally
6.1 The steel shall conform to the requirements of chemical
approved in 1996. Last previous edition approved in 2000 as A958 – 00. DOI:
10.1520/A0958-00R06.
composition as prescribed in Table 1.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 The product analysis tolerances given in Specification
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A781/A781M shall apply to all product analyses performed on
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. castings supplied to this specification.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A958 – 00 (2006)
TABLE 1 Chemical Composition, Weight Percent
NOTE 1—Values are maximum unless a range is given.
Grade C Mn P S Si Ni Cr Mo
SC 1020 0.18/0.23 0.40/0.80 0.040 0.040 0.30/0.60 - - -
SC 1025 0.22/0.28 0.40/0.80 0.040 0.040 0.30/0.60 - - -
SC 1030 0.28/0.34 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 1040 0.37/0.44 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 1045 0.43/0.50 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 4130 0.28/0.33 0.40/0.80 0.035 0.040 0.30/0.60 - 0.80/1.10 0.15/0.25
SC 4140 0.38/0.43 0.70/1.10 0.035 0.040 0.30/0.60 - 0.80/1.10 0.15/0.25
SC 4330 0.28/0.33 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30
SC 4340 0.38/0.43 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30
SC 8620 0.18/0.23 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
SC 8625 0.23/0.28 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
SC 8630 0.28/0.33 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
TABLE 2 Tensile Requirements
Class 65/35 70/36 80/40 80/50 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180
Tensile, ksi 65 70 80 80 90 105 115 130 135 150 160 165 210
Tensile, (MPa) (450) (485) (550) (550) (620) (725) (795) (895) (930) (1035) (1105) (1140) (1450)
Yield, ksi 35 36 40 50 60 85 95 115 125 135 145 150 180
Yield, (MPa) (240) (250) (275) (345) (415) (585) (655) (795) (860) (930) (1000) (1035) (1240)
Elongation in 224 22 18 22 18 17 14 11 97654
in.or50mm,
min, %
Reduction of 35 30 30 35 35 35 30 25 22 18 12 10 8
Area, %
TABLE 3 Tensile Requirements/Grade Suitability
Class 65/35 70/36 80/40 80/50 90/60 105/85 115/95 130/115 135/125 150/135 160/145 165/150 210/180
Grade
A
SC 1020 X X
SC 1025 X X
SC 1030 X X X X
B
SC 1040 X XX X X
B B
SC 1045 X X XX X X X
B B
SC 4130 X X XX X X X X X X
B B B B
SC 4140 X X X X X X X X XX XX
B B B B
SC 4330 X X X X X X X X XX XX X
B B B B B
SC 4340 X X X X X XX XX XX XX
B B
SC 8620 X X XX X X X
B B
SC 8625 X X XX X X X X X
B B
SC 8630 X X XX X X X X X X
A
“X” denotes that the properties may be achieved by at least one of the heat treatments referenced in 5. The effect of section thickness should be considered in making
grade selections. The heat treatment requirements do not imply that all section thicknesses will be through hardened.
B
These grades are likely to significantly exceed the minimum strength levels, therefore, problems may be experienced when trying to produce castings to low hardness
values.
7. Tensile Requirements 8.2 Repair welds shall be inspected to the same quality
standards that are used to inspect the castings. When castings
7.1 One tension test shall be made from each heat and shall
are produced with Supplementary Requirement S1 specified,
conform to the tensile requirements specified for the grade
weld repairs shall be inspected by magnetic particle examina-
selected in Tables 2 and 3.
tion to the same standards that are used to inspect the castings.
7.2 Tension test coupons shall be machined in accordance
When castings are produced with Supplementary S2 or S4, or
with Paragraph 9 of Test Methods and Definitions A370 and
both, as specified, weld repairs in which the depth of the cavity
tested in accordance with those methods.
prepared for weld repair exceeds 20 % of the wall thickness or
7.3 To determine conformance with the tension test require-
1 in. (25 mm), whichever is smaller, or in which the cavity
ments, an observed value or calculated value shall be rounded
prepared for welding is greater than approximately 10 in. (65
in accordance with Practice E29 to the nearest 500 psi [5 MPa]
cm , shall be radiographed or ultrasonically tested, or both, to
for yield point and tensile strength and to the nearest 1 % for
the same standards that are used to inspect the castings.
elongation and reduction of area.
8.3 ForallclassesofGradesSC1020,SC1025,andSC1030,
8. Repair by Welding
welds exceeding 20 % of the wall thickness or 1 in. (25 mm),
whichever is smaller, or exceeding appro
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