ASTM A434-90a(2000)

Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered

SCOPE
1.1 This specification covers hot-wrought and cold-finished quenched and tempered alloy steel bars.  
1.2 Hot-wrought bars are available in three strength level classes designated BB, BC, and BD, and cold-finished bars in two strength level classes designated BB and BC. The bars are available in the conditions specified in 4.4 subject to the size limitations shown.  
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: 77.140.60 - Steel bars and rods
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Relations

• Replaced By: ASTM A434-04 - Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered
• Effective Date: 01-Mar-2004
• Referred By: ASTM F1510-21 - Standard Specification for Rotary Positive Displacement Pumps, Ships Use
• Effective Date: 01-Jan-2000
• Referred By: ASTM F1718-01(2019) - Standard Specification for Rotary Positive Displacement Distillate Fuel Pumps
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 434 – 90a (Reapproved 2000)
Standard Specification for
Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched
and Tempered
This standard is issued under the fixed designation A 434; 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.
1. Scope 3.1.7 Strength class (Section 8 and Table 1),
3.1.8 Test report, if required (Section 11),
1.1 This specification covers hot-wrought and cold-finished
3.1.9 Supplementary Requirements or Special Require-
quenched and tempered alloy steel bars.
ments, if required, and
1.2 Hot-wrought bars are available in three strength level
3.1.10 End use.
classes designated BB, BC, and BD, and cold-finished bars in
two strength level classes designated BB and BC. The bars are
NOTE 1—A typical ordering description is as follows: 10 000 lb,
available in the conditions specified in 4.4 subject to the size Heat-Treated Alloy Steel Bars, Hot Rolled, 1.000 in. diameter 3 10 ft,
ASTM A 434 dated ____, Grade 4140, Class BB, Test Report Required,
limitations shown.
Motor Shafts.
1.3 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
4. Materials and Manufacture
information only.
4.1 Melting Practice—The steel shall be made by one or
2. Referenced Documents more of the following primary processes: open-hearth, basic-
oxygen, or electric-furnace. The primary melting may incor-
2.1 ASTM Standards:
porate separate degassing or refining and may be followed by
A 29/A 29M Specification for Steel Bars, Carbon and
secondary melting using electroslag remelting or vacuum arc
Alloy, Hot-Wrought and Cold-Finished, General Require-
remelting. Where secondary melting is employed, the heat
ments for
shall be defined as all of the ingots remelted from a single
A 370 Test Methods and Definitions for MechanicalTesting
primary heat.
of Steel Products
4 4.2 Discard—Sufficient discard shall be made to secure
E112 Test Methods for Determining Average Grain Size
freedom from injurious piping and undue segregation.
3. Ordering Information 4.3 Slow Cooling—Hot-wrought alloy bars shall, immedi-
ately after rolling, be allowed to cool to a temperature below
3.1 Orders for material under this specification should
the critical range under suitable conditions to prevent injury by
include the following information:
too rapid cooling.
3.1.1 Quantity (weight or number of pieces),
4.4 Condition—Bars shall be furnished in one of the fol-
3.1.2 Name of material (heat-treated alloy steel bars),
lowing conditions, as specified by the purchaser. Generally,
3.1.3 Method of finish (condition) (4.4),
size limits for various methods of processing round bars are:
3.1.4 Dimensions, including length (if hot-wrought bars are
Hot-wrought or hot- 9 ⁄2 in. (241.3 mm), max
for cold finishing, the cold-finished size should also be speci-
wrought descaled
fied),
Cold-drawn ⁄8 to 4 in. (3.2 to 102 mm), incl
3.1.5 ASTM designation and date of issue,
Cold-drawn, ground, and pol- ⁄8 to 4 in. (3.2 to 102 mm), incl
ished
3.1.6 Chemical composition grade (Section 5),
Turned and polished ⁄4 to 9 in. (19.1 to 229 mm),
incl
Turned, ground, and polished ⁄4 to 9 in. (19.1 to 229 mm),
incl
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys, and is the direct responsibility of Subcommittee
4.5 Heat Treatment:
A01.15 on Bars.
4.5.1 Heat treatment shall include quenching and tempering
Current edition approved Aug. 31, 1990. Published October 1990. Originally
published as A 434–59T. Replaces A 286 and A 364. Last previous edition
for all classes of material. The material shall be uniformly
A 434–90.
heated to the austenitizing temperature, soaked for a sufficient
Annual Book of ASTM Standards, Vol 01.05.
length of time to produce the desired structure (a lot thus
Annual Book of ASTM Standards, Vol 01.03.
Annual Book of ASTM Standards, Vol 03.01. heatedbeingknownasa“quenchingcharge”),andquenchedin
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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.
A 434 – 90a (2000)
TABLE 1 Tensile Properties
NOTE—The mechanical properties of hot-wrought bars ordered for cold finishing, shall be governed by the cold-finished size.
Class Diameter, in. (mm) Yield Strength, min, Tensile Strength, Elongation Reduction SAE or AISI Repre-
A
ksi (MPa) min, ksi (MPa) in 2 in. or of Area, sentative Grade
B
50 mm, min, % Types
min, %
1 ⁄2 (38.1) and under 90 (620) 110 (760) 20 50 3100, 4100,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 80 (550) 105 (720) 20 50 8600, 8700
C
BB Over 2 ⁄2 to 4 (63.5 to 114), incl 75 (520) 100 (690) 20 50
Over 4 to 7 (114 to 178), incl 75 (520) 95 (660) 20 50
Over 7 to 9 ⁄2 (178 to 241.3), incl 65 (450) 90 (620) 18 40
1 ⁄2 (38.1) and under 110 (760) 130 (900) 16 50 3100, 4100, 6100,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 105 (720) 125 (860) 16 50 8600, 8700
J
C 1
BC Over 2 ⁄2 to 4 (63.5 to 114), incl 95 (660) 115 (790) 16 45
Over 4 to 7 (114 to 178), incl 85 (590) 110 (760) 16 45 3100, 4100
J
Over 7 to 9 ⁄2 (178 to 241.3), incl 80 (550) 105 (720) 15 40 4300, 9800
1 ⁄2 (38.1) and under 130 (900) 155 (1070) 14 35 4100, 4300,
1 1
Over 1 ⁄2 to 2 ⁄2 (38.1 to 63.5), incl 120 (830) 150 (1030) 14 35 9800
C
BD Over 2 ⁄2 to 4 (63.5 to 114), incl 110 (760) 140 (960) 14 35
Over 4 to 7 (114 to 178), incl 105 (720) 135 (930) 14 35
Over 7 to 9 ⁄2 (178 to 241.3), incl 100 (690) 130 (900) 14 35
A
The carbon content of all steels listed in this column may vary up to 0.55% max, as agreed upon by the manufacturer and the purchaser.
B
Determined by the 0.2% offset method.
C
Class BB, BC, BD hot-wrought; Class BB, BC cold-finished.
a suitable medium under substantially uniform conditions for 6. Grain Size
each quenching charge. The material shall then be uniformly
6.1 Requirement—The bars shall have an austenitic grain
reheated to the proper temperature for tempering (a lot thus
size of 5 to 8. The grain structure shall be consi
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