ASTM A322-07
(Specification)Standard Specification for Steel Bars, Alloy, Standard Grades
Standard Specification for Steel Bars, Alloy, Standard Grades
ABSTRACT
This specification covers hot-wrought alloy steel bars. The steel shall be made by one or more of the following primary processes: open-hearth, basic-oxygen, or electric-furnace. The primary melting may incorporate separate degassing or refining and may be followed by secondary melting using electro-slag remelting or vacuum arc remelting. Where secondary remelting is employed, the heat shall be defined as all of the cast product remelted from a single primary heat. The steel shall be furnished as strand cast or ingot cast. Immediately after hot forming, the bars shall be allowed to cool to a temperature below the critical range under suitable conditions to prevent imperfections caused by too rapid cooling. The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free of injurious seams, laps, segregation, or other imperfections which are due to their nature, degree, or extent, will interfere with the use of the material in machining or fabrication of suitable parts.
SCOPE
1.1 This specification covers hot-wrought alloy steel bars. Bar applications include forging, heat treating, cold drawing, machining and many structural components (Note 1). Note 1 - A guide for the selection of steel bars is contained in Practice A 400.
1.2 The bars shall be furnished in the grades specified in Table 1. Sections and sizes of bar steel available are covered in Specification A 29/A 29M. Hot-wrought alloy steel bars are produced in cut lengths and coils; the manufacturer should be consulted regarding sections and sizes available in coils, produced to a chemical composition.
1.3 Some applications may require superior surface quality, or special chemical restrictions, metallurgical characteristics, heat treatment, or surface finishes which the purchaser may obtain by designating one or more of the available Supplementary Requirements.
General Information
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Standards Content (Sample)
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Designation:A322 −07
StandardSpecification for
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Steel Bars, Alloy, Standard Grades
This standard is issued under the fixed designation A322; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 3. Ordering Information
1.1 This specification covers hot-wrought alloy steel bars. 3.1 Orders under this specification should include the fol-
Bar applications include forging, heat treating, cold drawing, lowing as required to describe adequately the desired material:
machining and many structural components (Note 1). 3.1.1 Quantity (weight or number of bars),
3.1.2 Name of material (hot-wrought alloy steel bars),
NOTE 1—Aguide for the selection of steel bars is contained in Practice
3.1.3 Dimensions,
A400.
3.1.4 ASTM designation,
1.2 The bars shall be furnished in the grades specified in
3.1.5 Deoxidation practice (see 5.3),
Table 1. Sections and sizes of bar steel available are covered in
3.1.6 Gradedesignationorchemicalcompositionlimits(see
Specification A29/A29M. Hot-wrought alloy steel bars are
6.1 and Table 1),
produced in cut lengths and coils; the manufacturer should be
3.1.7 Grain size if required,
consulted regarding sections and sizes available in coils,
3.1.8 Test reports, if required (Section 8),
produced to a chemical composition.
3.1.9 Additions to the specification and Supplementary
1.3 Some applications may require superior surface quality,
Requirements, if required, and
or special chemical restrictions, metallurgical characteristics,
3.1.10 Application.
heat treatment, or surface finishes which the purchaser may
obtain by designating one or more of the available Supplemen-
4. General Requirements
tary Requirements.
4.1 Material furnished under this specification shall con-
form to the applicable requirements of the current edition of
2. Referenced Documents
Specification A29/A29M, unless otherwise provided herein.
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2.1 ASTM Standards:
A29/A29M Specification for Steel Bars, Carbon and Alloy, 5. Materials and Manufacture
Hot-Wrought, General Requirements for
5.1 The steel shall be made by one or more of the following
A304 Specification for Carbon andAlloy Steel Bars Subject
primary processes: open-hearth, basic-oxygen, or electric-
to End-Quench Hardenability Requirements
furnace. The primary melting may incorporate separate degas-
A400 Practice for Steel Bars, Selection Guide, Composition,
sing or refining and may be followed by secondary melting
and Mechanical Properties
using electro-slag remelting or vacuum arc remelting. Where
E112 Test Methods for Determining Average Grain Size
secondary melting is employed, the heat shall be defined as all
E381 Method of Macroetch Testing Steel Bars, Billets,
of the cast product remelted from a single primary heat.
Blooms, and Forgings
5.2 The steel shall be furnished as strand cast or ingot cast,
E527 Practice for Numbering Metals and Alloys in the
unless otherwise specified.
Unified Numbering System (UNS)
5.2.1 Discard—A sufficient discard shall be made to secure
freedom from injurious piping and undue segregation.
5.3 Deoxidation—Killed steel is required.
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This specification is under the jurisdiction ofASTM Committee A01 on Steel,
5.3.1 The purchaser may designate that the steel be made to
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.15 on Bars.
coarse or fine austenitic grain size. (See Supplementary Re-
Current edition approved May 1, 2007. Published May 2007. Originally
quirement S9 or S10.)
approved in 1947. Last previous edition approved in 2006 as A322 – 06. DOI:
10.1520/A0322-07.
5.4 Slow Cooling—Immediately after hot forming, the bars
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shall be allowed to cool to a temperature below the critical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
range under suitable conditions to prevent imperfections
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. caused by too rapid cooling.
*A Summary of Changes section appears at the end of this standard
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A322−07
A,B
TABLE 1 Grade Designations and Chemical Compositions of Hot-Wrought Alloy Steel Bars
D
UNS Grade Chemical Composition, Ranges and Limits, %
C
Designations
Designation E F
Carbon Manganese Phospho- Sulfur, Silicon Nickel Chromium Molybdenum
max
rus, max
G13300 1
...
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