ASTM A739-90a(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:A739 −90a (Reapproved 2022)
Standard Specification for
Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or
Pressure-Containing Parts, or Both
This standard is issued under the fixed designation A739; 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 U.S. Department of Defense.
1. Scope 3. Ordering Information
1.1 This specification covers hot-wrought, ferritic alloy
3.1 Orders for material under this specification should
steel bars for elevated temperature or pressure-containing parts
include the following information:
suitable for fusion welding or both.
3.1.1 Quantity (weight or number of pieces),
3.1.2 Name of material (ferritic alloy steel bars),
1.2 The bars are furnished in the following grades:
3.1.3 Condition (hot wrought, normalized and tempered,
Grade B 11: 1.25 % chromium, 0.55 % molybdenum
Grade B 22: 2.25 % chromium, 1.00 % molybdenum machine straightened and descaled),
3.1.4 Dimensions (cross-sectional shape, size, and length),
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 3.1.5 ASTM designation and date of issue,
conversions to SI units that are provided for information only 3.1.6 Grade (Table 1),
and are not considered standard.
3.1.7 Additions to the specification, and
3.1.8 End use.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
NOTE 1—A typical description is as follows: 10 000 lb, Ferritic Alloy
ization established in the Decision on Principles for the
Steel Bars, Hot Wrought Normalized and Tempered, and Descaled,
Development of International Standards, Guides and Recom-
1.000 in. diameter by 10 ft, ASTM A739 dated____, Grade B11, Special
mendations issued by the World Trade Organization Technical Straightened, Special Machined Fittings.
Barriers to Trade (TBT) Committee.
4. Materials and Manufacture
2. Referenced Documents
4.1 Melting Practice—The steel shall be made by one or
2.1 ASTM Standards: more of the following primary processes: open-hearth, basic-
A29/A29M SpecificationforGeneralRequirementsforSteel
oxygen, or electric-furnace. The primary melting may incor-
Bars, Carbon and Alloy, Hot-Wrought porate separate degassing or refining and may be followed by
A370 Test Methods and Definitions for Mechanical Testing
secondary melting using electroslag remelting or vacuum arc
of Steel Products
remelting. Where secondary melting is employed, the heat
shall be defined as all of the ingots remelted from a single
2.2 ASME Code:
primary heat.
ASME Boiler and Pressure Vessel Code
4.2 Condition—Unlessotherwisespecified,barsshallbehot
wrought, heat treated, and descaled.
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
4.3 Heat Treatment:
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.15 on Bars.
4.3.1 The bars shall be normalized and tempered.
Current edition approved March 1, 2022. Published March 2022. Originally
4.3.2 Austenitizing temperature shall be within the range
approved in 1976. Last previous edition approved in 2016 as A739 – 90a (2016).
from 1700 °F to 1800 °F (927 °C to 982 °C).
DOI: 10.1520/A0739-90AR22.
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
4.3.3 Cooling from the austenitizing temperature may be
cation SA-739 in Section II of that code.
accomplished by cooling in still air or moving air, at the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
producer’s option. When permitted by the purchaser, cooling
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
fromtheaustenitizingtemperaturemaybeacceleratedbyspray
the ASTM website.
or liquid quenching.
Available from American Society of Mechanical Engineers (ASME), ASME
4.3.4 Theminimumtemperingtemperatureshallbe1200 °F
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org. (649 °C) for Grade B11 and 1250 °F (677 °C) for Grade B22.
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A739−90a (2022)
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