ASTM A739-90a(2000)

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

SCOPE
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 the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 31-Dec-1999
• ICS: 77.140.30 - Steels for pressure purposes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Relations

• Replaced By: ASTM A739-90a(2006) - Standard Specification for Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or Pressure-Containing Parts, or Both
• Effective Date: 01-Mar-2006
• Referred By: ASTM A29/A29M-23 - Standard Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
• Effective Date: 01-Jan-2000
• Referred By: ASTM A182/A182M-23 - Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
• Effective Date: 01-Jan-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 739 – 90a (Reapproved 2000)
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 A 739; 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.
This standard has been approved for use by agencies of the Department of Defense.
TABLE 1 Chemical Requirements
1. Scope
2 Element Composition, %
1.1 This specification covers hot-wrought, ferritic alloy
Grade B 11 Grade B 22
steel bars for elevated temperature or pressure-containing parts
suitable for fusion welding or both.
Carbon, max 0.05–0.20 0.05–0.15
Manganese 0.40–0.65 0.30–0.60
1.2 The bars are furnished in the following grades:
Phosphorus, max 0.035 0.035
Grade B 11: 1.25 % chromium, 0.55 % molybdenum
Sulfur, max 0.040 0.040
Grade B 22: 2.25 % chromium, 1.00 % molybdenum Silicon 0.50–0.80 0.50 max
Chromium 1.00–1.50 2.00–2.50
1.3 The values stated in inch-pound units are to be regarded
Molybdenum 0.45–0.65 0.90–1.10
as the standard. The values given in parentheses are for
information only.
NOTE 1—A typical description is as follows: 10 000 lb, Ferritic Alloy
2. Referenced Documents
Steel Bars, Hot Wrought Normalized and Tempered, and Descaled,
1.000-in. diameter by 10 ft,ASTMA 739 dated____, Grade B 11, Special
2.1 ASTM Standards:
Straightened, Special Machined Fittings.
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy,
Hot-Wrought and Cold-Finished, General Requirements
4. Materials and Manufacture
for
4.1 Melting Practice—The steel shall be made by one or
A 370 Test Methods and Definitions for MechanicalTesting
more of the following primary processes: open-hearth, basic-
of Steel Products
oxygen, or electric-furnace. The primary melting may incor-
porate separate degassing or refining and may be followed by
3. Ordering Information
secondary melting using electroslag remelting or vacuum arc
3.1 Orders for material under this specification should
remelting. Where secondary melting is employed, the heat
include the following information:
shall be defined as all of the ingots remelted from a single
3.1.1 Quantity (weight or number of pieces),
primary heat.
3.1.2 Name of material (ferritic alloy steel bars),
4.2 Condition—Unless otherwise specified, bars shall be
3.1.3 Condition (hot wrought, normalized and tempered,
hot wrought, heat treated, and descaled.
machine straightened and descaled),
4.3 Heat Treatment:
3.1.4 Dimensions (cross-sectional shape, size, and length),
4.3.1 The bars shall be normalized and tempered.
3.1.5 ASTM designation and date of issue,
4.3.2 Austenitizing temperature shall be within the range
3.1.6 Grade (Table 1),
from 1700 to 1800°F (927 to 982°C).
3.1.7 Additions to the specification, and
4.3.3 Cooling from the austenitizing temperature may be
3.1.8 End use.
accomplished by cooling in still air or moving air, at the
producer’s option. When permitted by the purchaser, cooling
fromtheaustenitizingtemperaturemaybeacceleratedbyspray
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
or liquid quenching.
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
4.3.4 The minimum tempering temperature shall be 1200°F
A01.15 on Bars.
(649°C) for Grade B 11 and 1250°F (677°C) for Grade B 22.
Current edition approved Aug. 31, 1990. Published October 1990. Originally
published as A 739–76. Last previous edition A 739–90.
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
5. Chemical Composition
cation SA-739 in Section II of that code.
3 5.1 The heat analysis shall conform to the limits for chemi-
Annual Book of ASTM Standards, Vol 01.05.
Annual Book of ASTM Standards, Vol 01.03. cal composition specified in Table 1 for the grade ordered.
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