ASTM A837-91(2001)

Standard Specification for Steel Forgings, Alloy, for Carburizing Applications

SCOPE
1.1 This specification covers alloy steel forgings for carburizing applications.  
1.2 Forgings are considered weldable under proper conditions. Welding technique is of fundamental importance and it is presupposed that welding procedure and inspection shall be in accordance with approved methods for the class of material used.

General Information

• Status: Historical
• Publication Date: 14-Dec-1991
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A837-91(1996)e1 - Standard Specification for Steel Forgings, Alloy, for Carburizing Applications
• Effective Date: 15-Dec-1991
• Replaced By: ASTM A837/A837M-03 - Standard Specification for Steel Forgings, Alloy, for Carburizing Applications
• Effective Date: 10-Jun-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 837 – 91 (Reapproved 2001)
Standard Specification for
1
Steel Forgings, Alloy, for Carburizing Applications
This standard is issued under the fixed designation A 837; 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 6. Chemical Composition
1.1 This specification covers alloy steel forgings for carbur- 6.1 The steel shall conform to the requirements for chemical
izing applications. composition prescribed in Table 1 unless otherwise modified in
1.2 Forgings are considered weldable under proper condi- accordance with Supplementary Requirement S4.
tions. Welding technique is of fundamental importance and it is
7. Mechanical Properties
presupposed that welding procedure and inspection shall be in
accordance with approved methods for the class of material 7.1 Hardness:
7.1.1 Maximum hardness of the forgings shall be 229 BHN.
used.
7.1.2 Hardness tests shall be taken on prepared surfaces of
2. Referenced Documents
the forging after machining to the purchaser’s ordering require-
2.1 ASTM Standards: ments.
A 275/A 275M Test Method for Magnetic Particle Exami- 7.1.3 Number and Location of Tests:
2
nation of Steel Forgings 7.1.3.1 For forgings not intended for gear applications, the
A 388/A 388M Practice for Ultrasonic Examination of number and location of hardness tests shall be by agreement
2
Heavy Steel Forgings between the purchaser and forger.
A 788 Specification for Steel Forgings, General Require- 7.1.3.2 For gear applications on each forging 8 in. (205 mm)
2
ments and over in diameter, four Brinell hardness tests shall be made
3
E 527 Practice for Numbering Metals and Alloys (UNS) on the outside surface of that portion of the forging on which
teeth will be cut two tests being made on each helix 180° apart,
3. Ordering Information
and the tests on the two helices shall be 90° apart. On each
3.1 Instructions for purchasing forgings to this specification
forging under 8 in. in diameter two Brinell hardness tests shall
are to be in accordance with Specification A 788. be made, one on each helix 180° apart. On hollow, cylindrical
3.2 In addition to the basic requirements of this specifica-
forgings, one hardness test on each end shall be taken 180°
tion, certain supplementary requirements are listed at the end apart. Hardness tests shall be performed at the quarter-face
of this specification. These supplementary requirements may
width of the tooth-portion diameter.
be applicable when additional control, testing, or examination
8. Other Requirements
is required to meet end use requirements.
8.1 Forgings supplied to this material specification shall
4. Heat Treatment
conform to the latest issue of Specification A 788.
4.1 The forgings shall be given a normalize or normalize 8.2 Specification A 788 covers forging terminology, melting
and temper heat treatment.
processes, chemical analysis test methods, product analysis
tolerances, mechanical testing methods, repair welding restric-
5. Machining
tions, marking, and certification requirements.
5.1 Rough machining before heat treatment may be per-
9. Keywords
formed at the option of the manufacturer.
9.1 alloy steel forgings; carburizing
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
Current edition approved Dec. 15, 1991. Published February 1992. Originally
published as A837 – 85. Last previous edition A837 – 85 (1990).
2
Annual Book of ASTM Standards, Vol 01.05.
3
Annual Book of ASTM Standards, Vol 01.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 837 – 91 (2001)
TABLE 1 Grade Designations and Chemical Compositions
UNS Grade Chemical Composition, Ranges and Limits, %
A B
Designation Designation
C
Carbon Man- Phos- Sulfur, Silicon Nickel Chro- Molyb- Copper,
ganese phorus, max mium denum max
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 0.040 0.15–0.35 1.65–2.00 0.40–0.60 0.20–0.30 0.35
G46200 4620 0.17–0.22 0.45–0.65 0.035 0.040 0.15–0.35 1.65–2.00 0.25 max 0.20–0.30 0.35
G48150 4815 0.13–0.18 0.40–0.60 0.035 0.040 0.15–0.35 3.25–3.75 0.25 max 0.20–0.30 0.35
G86200 8620 0.18–0.23 0.70–0.90 0.035 0.040 0.15–0.35
...