ASTM A739-90a(2016)

Standard Specification for Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or Pressure-Containing Parts, or Both

ABSTRACT
This specification covers hot-wrought, ferritic alloy steel bars for elevated temperature or pressure-containing parts suitable for fusion welding or both. The bars are furnished in two grades: Grade B 11 and Grade B 22. The steel shall be made by on or more of the following primary processes: open-hearth, basic-oxygen, or electric furnace. The bars shall be normalized and tempered. The heat analysis shall conform to the limits for chemical composition specified. The bars as represented by the test specimen shall conform to the tensile requirements specified.
SCOPE
1.1 This specification2 covers hot-wrought, ferritic alloy steel bars for elevated temperature or pressure-containing parts suitable for fusion welding or both.  
1.2 The bars are furnished in the following grades:    
Grade B 11: 1.25 % chromium, 0.55 % molybdenum  
Grade B 22: 2.25 % chromium, 1.00 % molybdenum  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

General Information

• Status: Historical
• Publication Date: 31-Aug-2016
• ICS: 77.140.30 - Steels for pressure purposes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A739 −90a (Reapproved 2016)
Standard Specification for
Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or
1
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 3.1.7 Additions to the specification, and
2 3.1.8 End use.
1.1 This specification covers hot-wrought, ferritic alloy
steel bars for elevated temperature or pressure-containing parts
NOTE 1—A typical description is as follows: 10 000 lb, Ferritic Alloy
Steel Bars, Hot Wrought Normalized and Tempered, and Descaled,
suitable for fusion welding or both.
1.000-in. diameter by 10 ft, ASTM A739 dated____, Grade B11, Special
1.2 The bars are furnished in the following grades:
Straightened, Special Machined Fittings.
Grade B 11: 1.25 % chromium, 0.55 % molybdenum
4. Materials and Manufacture
Grade B 22: 2.25 % chromium, 1.00 % molybdenum
4.1 Melting Practice—The steel shall be made by one or
1.3 The values stated in inch-pound units are to be regarded
more of the following primary processes: open-hearth, basic-
as standard. The values given in parentheses are mathematical
oxygen, or electric-furnace. The primary melting may incor-
conversions to SI units that are provided for information only
porate separate degassing or refining and may be followed by
and are not considered standard.
secondary melting using electroslag remelting or vacuum arc
2. Referenced Documents
remelting. Where secondary melting is employed, the heat
3
shall be defined as all of the ingots remelted from a single
2.1 ASTM Standards:
primary heat.
A29/A29M SpecificationforGeneralRequirementsforSteel
Bars, Carbon and Alloy, Hot-Wrought
4.2 Condition—Unlessotherwisespecified,barsshallbehot
A370 Test Methods and Definitions for Mechanical Testing
wrought, heat treated, and descaled.
of Steel Products
4.3 Heat Treatment:
4.3.1 The bars shall be normalized and tempered.
3. Ordering Information
4.3.2 Austenitizing temperature shall be within the range
3.1 Orders for material under this specification should
from 1700 to 1800°F (927 to 982°C).
include the following information:
4.3.3 Cooling from the austenitizing temperature may be
3.1.1 Quantity (weight or number of pieces),
accomplished by cooling in still air or moving air, at the
3.1.2 Name of material (ferritic alloy steel bars),
producer’s option. When permitted by the purchaser, cooling
3.1.3 Condition (hot wrought, normalized and tempered,
fromtheaustenitizingtemperaturemaybeacceleratedbyspray
machine straightened and descaled),
or liquid quenching.
3.1.4 Dimensions (cross-sectional shape, size, and length),
4.3.4 The minimum tempering temperature shall be 1200°F
3.1.5 ASTM designation and date of issue,
(649°C) for Grade B11 and 1250°F (677°C) for Grade B22.
3.1.6 Grade (Table 1),
5. Chemical Composition
5.1 The heat analysis shall conform to the limits for chemi-
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
cal composition specified in Table 1 for the grade ordered.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.15 on Bars.
6. Mechanical Properties
Current edition approved Sept. 1, 2016. Published September 2016. Originally
approved in 1976. Last previous edition approved in 2012 as A739 – 90a (2012).
6.1 Tensile Requirements—The bars as represented by the
DOI: 10.1520/A0739-90AR16.
test specimens shall conform to the tensile requirements
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
specified in Table 2.
cation SA-739 in Section II of that code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Specimens—Tension test specimens shall be taken lon-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
gitudinally and machined from the locations specified in Test
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Methods and Definitions A370.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A739−90a (2016)
TABLE 1 Chemical Requirements
laps, segregation, or other imperfections which, due to their
Composition, % nature, degree or extent, will interfere with the use of the
Element
Grade B 11 Grade B 22 material in machining or fabrication.
Carbon, max 0.05–0.20 0.05–0.15
7.2 Descaling—Unlessotherwisespecified,thebarsshallbe
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A739 − 90a (Reapproved 2012) A739 − 90a (Reapproved 2016)
Standard Specification for
Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or
1
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
2
1.1 This specification covers hot-wrought, ferritic alloy steel bars for elevated temperature or pressure-containing parts suitable
for fusion welding or both.
1.2 The bars are furnished in the following grades:
Grade B 11: 1.25 % chromium, 0.55 % molybdenum
Grade B 22: 2.25 % chromium, 1.00 % molybdenum
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents
3
2.1 ASTM Standards:
A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
3. Ordering Information
3.1 Orders for material under this specification should include the following information:
3.1.1 Quantity (weight or number of pieces),
3.1.2 Name of material (ferritic alloy steel bars),
3.1.3 Condition (hot wrought, normalized and tempered, machine straightened and descaled),
3.1.4 Dimensions (cross-sectional shape, size, and length),
3.1.5 ASTM designation and date of issue,
3.1.6 Grade (Table 1),
3.1.7 Additions to the specification, and
3.1.8 End use.
NOTE 1—A typical description is as follows: 10 000 lb, Ferritic Alloy Steel Bars, Hot Wrought Normalized and Tempered, and Descaled, 1.000-in.
diameter by 10 ft, ASTM A739 dated____, Grade B11, Special Straightened, Special Machined Fittings.
4. Materials and Manufacture
4.1 Melting Practice—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 electroslag remelting or vacuum arc remelting. Where secondary melting is employed, the heat shall be defined as all of the
ingots remelted from a single primary heat.
4.2 Condition—Unless otherwise specified, bars shall be hot wrought, heat treated, and descaled.
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 A01.15
on Bars.
Current edition approved March 1, 2012Sept. 1, 2016. Published April 2012September 2016. Originally approved in 1976. Last previous edition approved in 20062012
as A739 – 90a (2012). (2006). DOI: 10.1520/A0739-90AR12.10.1520/A0739-90AR16.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-739 in Section II of that code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A739 − 90a (2016)
TABLE 1 Chemical Requirements
Element Composition, %
Grade B 11 Grade B 22
Carbon, max 0.05–0.20 0.05–0.15
Manganese 0.40–0.65 0.30–0.60
Phosphorus, max 0.035 0.035
Sulfur, max 0.040 0.040
Silicon 0.50–0.80 0.50 max
Chromium 1.00–1.50 2.00–2.50
Molybdenum 0.45–0.65 0.90–1.10
4.3 Heat Treatment:
4.3.1 The bars shall be normalized and tempered.
4.3.2 Austenitizing temperature shall be within the range from 1700 to 1800°F (927 to 982°C).
4.3.3 Cooling from the austenitizing temperature may be accomplished by cooling in still air or moving air, at the
producer’sproducer’s option. When permitted by the purchaser, cooling from the austenitizing temperature may be accelerated by
spray or liquid quenching.
4.3.4 The minimum tempering temperature shall be 1200°F (649°C) for Grade B11 and 1250°F (677°C) for Grade B22.
5. Chemical Composition
5.1 The heat analysis shall conform to the limits for chemical composition sp
...