Designation: A 290/A 290M – 05
Standard Specification for
Carbon and Alloy Steel Forgings for Rings for Reduction
Gears
1
This standard is issued under the fixed designation A 290/A 290M; 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*
1.1 This specification covers normalized and tempered, and
quenched and tempered, carbon and alloy steel forged or rolled
rings for reduction gears.
1.2 Several grades and classes of steel are covered as
follows:
1.2.1 Grade 1, Classes A and B, and Grade 2, Classes C and
D, are carbon steel.
1.2.2 Grade 3, Classes E and F, Grade 4, Classes G, H, I, J,
K and L, Grade 5, Classes M and P, and Grade 6, Class T, are
alloy steel.
1.2.3 All grades and classes are considered weldable under
proper conditions. Welding techniques are of fundamental
importance and it is pre-supposed that welding procedure and
inspection will be in accordance with proper methods for the
class of material used.
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
with the standard.
2. Referenced Documents
2.1 ASTM Standards:
2
A 275/A275M Test Method for Magnetic Particle Exami-
nation of Steel Forgings
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 388/A388M Practice for Ultrasonic Examination of
Heavy Steel Forgings
A 788 Specification for Steel Forgings, General Require-
ments
3. Terminology
3.1 Definitions—Definitions of the terms used may be
found in Specification
A 788.
4. Ordering Information and General Requirements
4.1 In addition to the ordering information required by
Specification
A 788, the purchaser shall specify in the inquiry,
contract, and order the grade and class desired and the
supplementary requirements, if any, which should apply.
4.2 Material supplied to this specification shall conform to
the requirements of Specification
A 788, which outlines addi-
tional ordering information, manufacturing requirements, test-
ing and retesting methods and procedures, marking, certifica-
tion, product analysis variations, and additional supplementary
requirements.
5. Materials and Manufacture
5.1 Melting Process:
5.1.1 The steel shall be produced by any of the melting
requirements in Specification
A 788, which may be supple-
mented by Supplementary Requirement S6, Vacuum Degas-
sing.
5.2 Discard—Sufficient discard shall be taken from each
ingot to secure freedom from piping and undue segregation.
5.3 Forging Process—The forgings shall receive their hot
mechanical work in accordance with the requirements of
Specification
A 788.
5.4 Heat Treatment:
5.4.1 Cooling Prior to Heat Treatment—After forging and
before reheating for heat treatment, the forgings shall be
allowed to cool in a manner to prevent injury, to accomplish
transformation, and prevent flakes.
5.4.2 Heat treatment shall consist of normalizing and tem-
pering for Grade 1 classes A and B and quenching and
tempering for all other grades and classes.
5.4.2.1 Normalizing—A furnace charge thus treated is
termed a normalizing charge.
5.4.2.2 Quenching—The forgings shall be completely aus-
tenitized and then quenched in a suitable medium. A group thus
treated is termed a quenching charge.
5.4.2.3 Tempering—A furnace charge thus treated is termed
a tempering charge. Minimum tempering temperatures shall be
as follows:
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 Sept. 1, 2005. Published September 2005. Originally
approved in 1946. Last previous edition approved in 2002 as A 290 – 02.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright by ASTM Int'l (all rights reserved);
Reproduction authorized per License Agreement with Kathe Hooper (ASTMIHS Account); Mon Oct 17 14:36:13 EDT 2005
Copyright ASTM International
Reproduced by IHS under license with ASTM
No reproduction or networking permitted without license from IHS
--`,,```,,,,````-`-`,,`,,`,`,,`---