ASTM A837/A837M-17(2022)

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.
Designation: A837/A837M −17 (Reapproved 2022)
Standard Specification for
Steel Forgings, Alloy, for Carburizing Applications
This standard is issued under the fixed designationA837/A837M; 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* E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)
1.1 This specification covers alloy steel forgings for carbur-
izing applications.
3. Ordering Information
1.2 Forgings are considered weldable under proper condi-
3.1 Instructions for purchasing forgings to this specification
tions.Weldingtechniqueisoffundamentalimportanceanditis
are to be in accordance with Specification A788/A788M.
presupposed that welding procedure and inspection shall be in
3.2 In addition to the basic requirements of this
accordance with approved methods for the class of material
specification, certain supplementary requirements are listed at
used.
the end of this specification. These supplementary require-
1.3 This specification is expressed in both inch-pound units
ments may be applicable when additional control, testing, or
and in SI units. However, unless the order specifies the
examination is required to meet end use requirements.
applicable M specification designation (SI units), the material
shall be furnished to inch-pound units.
4. Heat Treatment
1.4 The values stated in either SI units or inch-pound units
4.1 The forgings shall be given a normalize or normalize
are to be regarded separately as standard. The values stated in
and temper heat treatment.
each system are not necessarily exact equivalents; therefore, to
ensure conformance with the standard, each system shall be
5. Machining
used independently of the other, and values from the two
5.1 Rough machining before heat treatment may be per-
systems shall not be combined.
formed at the option of the manufacturer.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
6. Chemical Composition
ization established in the Decision on Principles for the
6.1 Thesteelshallconformtotherequirementsforchemical
Development of International Standards, Guides and Recom-
composition prescribed inTable 1 unless otherwise modified in
mendations issued by the World Trade Organization Technical
accordance with Supplementary Requirement S4.
Barriers to Trade (TBT) Committee.
7. Mechanical Properties
2. Referenced Documents
2 7.1 Hardness:
2.1 ASTM Standards:
7.1.1 Maximum hardness of the forgings shall be 229
A275/A275M Practice for Magnetic Particle Examination of
Brinell hardness.
Steel Forgings
7.1.2 Hardness tests shall be taken on prepared surfaces of
A388/A388M Practice for Ultrasonic Examination of Steel
theforgingaftermachiningtothepurchaser’sorderingrequire-
Forgings
ments.
A788/A788M Specification for Steel Forgings, General Re-
7.1.3 Number and Location of Tests:
quirements
7.1.3.1 For forgings not intended for gear applications, the
number and location of hardness tests shall be by agreement
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
between the purchaser and forger.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
7.1.3.2 Forgearapplicationsoneachforging8in.[200mm]
A01.06 on Steel Forgings and Billets.
and over in diameter, four Brinell hardness tests shall be made
Current edition approved March 1, 2022. Published March 2022. Originally
on the outside surface of that portion of the forging on which
approved in 1985. Last previous edition approved in 2017 as A837/A837M – 17.
DOI: 10.1520/A0837_A0837M-17R22.
teeth will be cut two tests being made on each end 180° apart,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and the tests on the two ends shall be 90° apart. On each
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
forging under 8 in. [200 mm] in diameter two Brinell hardness
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tests shall be made, one on each end 180° apart. On hollow,
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
A837/A837M − 17 (2022)
TABLE 1 Grade Designations and Chemical Compositions
Chemical Composition, Ranges and Limits, %
Phos-
UNS Grade Man- phorus, Sulfur, Chro- Molyb- Copper,
A B C
Designation Designation Carbon ganese max max Silicon Nickel mium denum max
G33106 E3310 0.08–0.13 0.45–0.60 0.025 0.025 0.15–0.35 3.25–3.75 1.40–1.75 0.10 max 0.35
G43200 4320 0.17–0.22 0.45–0.65 0.035
...