ASTM A958-00

Standard Specification for Steel Castings, Carbon, and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades

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 shown in Table 1.  
1.3 Options for tensile properties are shown in Tables 2 and 3.  
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 A958 and SI units for material ordered to Specification A958M.

General Information

• Status: Historical
• Publication Date: 09-Sep-2000
• ICS: 77.100 - Ferroalloys
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Replaced By: ASTM A958-00(2006) - Standard Specification for Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades
• Effective Date: 01-Mar-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 958 – 00
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 A 958; 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 A 781/A 781M Specification for Castings, Steel andAlloy,
Common Requirements, for General Industrial Use
1.1 This specification covers carbon and low-alloy steel
E 29 Practice for Using Significant Digits in Test Data to
castings having chemical analyses similar to that of the
Determine Conformance with Specifications
standard wrought grades.
1.2 Several classes are covered and are designated by
3. General Conditions for Delivery
chemical composition as shown in Table 1.
3.1 Material furnished to this specification shall conform to
1.3 Options for tensile properties are shown in Tables 2 and
the requirements of Specification A 781/A 781M, including
3.
any supplementary requirements that are indicated in the
1.4 The values stated in either inch-pound units or SI units
purchase order. Failure to comply with the general require-
are to be regarded separately as standard. Within the text, the
ments of Specification A 781/A 781M constitutes nonconfor-
SI units are shown in brackets. The values stated in each
mance with this specification. In case of conflict between the
system are not exact equivalents; therefore, each system must
requirements of this specification and Specification A 781/
be used independently of the other. Combining values from the
A 781M, this specification shall prevail.
two systems may result in nonconformance with the specifica-
tion. Inch-pound units are applicable for material ordered to
4. Ordering Information
Specification A 958 and SI units for material ordered to
4.1 Orders for material under this specification should
Specification A 958.
include the following information.
4.1.1 Quantity,
2. Referenced Documents
4.1.2 Specification, including year and date of issue,
2.1 ASTM Standards:
4.1.3 Grade and class of steel,
A 370 Test Methods and Definitions for MechanicalTesting
2 4.1.4 Description of the casting by pattern number or
of Steel Products
drawing (Dimensional tolerances should be included on the
A 488/A 488M Practice for Steel Castings, Welding, Quali-
2 casting drawing.),
fication of Procedures and Personnel
4.1.5 Options in the specification, and
4.1.6 Supplementary requirements desired, including stan-
ThisspecificationisunderthejurisdictionofASTMCommitteeA01onFerrous dards of acceptance.
Metals and is the direct responsibility of Subcommittee A01.18 on Castings.
Current edition approved Sept. 10, 2000. Published November 2000. Originally
e1
published as A 958 – . Last previous edition A 958 – 96 .
2 3
Annual Book of ASTM Standards, Vol 01.02. Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 958
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.
5. Heat Treatment
5.1 All castings shall receive a heat treatment indicated in
Table 4. Preliminary heat treatment prior to final heat treatment
as well as multiple tempering is permitted.
A 958
TABLE 4 Heat Treatment
TABLE 4 Continued
NOTE 1—The effect of section thickness should be considered in Grade Class Austenitizing Media Tempering Tem-
Temperature, perature, min,°
making grade selections. The heat treatment requirements do not imply
min, °F (°C) F (°C)
that all section thicknesses will be through hardened.
B
SC4340 65/35 1600 (870) A 1200 (650)
NOTE 2—Post-weld heat treatment must be at or below the final
B
70/36 1600 (870) A 1200 (650)
tempering temperature.
B
80/40 1600 (870) A 1200 (650)
B
NOTE 3—Following quenching the castings must be cooled below
80/50 1600 (870) A 1150 (620)
B
500°F (260°C) prior to tempering. 90/60 1600 (870) A 1150 (620)
105/85 1600 (870) A 1150 (620)
115/95 1600 (870) A or L 1050 (565)
Grade Class Austenitizing Media Tempering Tem-
130/115 1600 (870) L 1000 (535)
Temperature, perature, min,°
135/125 1600 (870) L 1000 (535)
min, °F (°C) F (°C)
150/135 1600 (870) L 950 (510)
A
SC1020 65/35 1700 (925) A –
160/145 1600 (870) L 950 (510)
70/36 1700 (925) A –
165/150 1600 (870) L 950 (510)
210/180 1600 (870) L 900 (480)
SC1025 65/35 1700 (925) A –
B
70/36 1700 (925) A –
SC8620 65/35 1700 (925) A 1200 (650)
B
70/36 1700 (925) A 1200 (650)
SC1030 65/35 1650 (900) A –
80/40 1700 (925) A 1150 (620)
70/36 1650 (900) A 1100 (595)
80/50 1700 (925) A or L 1150 (620)
A
80/40 1650 (900) L 1100 (595)
90/60 1700 (925) L 1150 (620)
80/50 1650 (900) L 1100 (595)
105/85 1700 (925) L 1100 (595)
115/95 1700 (925) L 1050 (565)
B
SC1040 65/35 1650 (900) A 1150 (621)
B
70/36 1650 (900) A 1150 (621)
SC8625 65/35 1700 (925) A 1200 (650)
B
80/40 1650 (900) A 1150 (621)
70/36 1700 (925) A 1200 (650)
80/50 1650 (900) A 1100 (595)
80/40 1700 (925) A or L 1150 (620)
90/60 1650 (900) A 1100 (595)
80/50 1700 (925) A or L 1150 (620)
90/60 1700 (925) A or L 1150 (620)
B
SC1045 65/35 1600 (870) A 1150 (621)
105/85 1700 (925) L 1100 (595)
B
70/36 1600 (870) A 1150 (621)
115/95 1700 (925) L 1100 (595)
80/40 1600 (870) A 1150 (621)
130/115 1700 (925) L 1100 (595)
80/50 1600 (870) A 1150 (621)
135/125 1700 (925) L 1050 (565)
...