Designation: A400 − 69 (Reapproved 2012)
Standard Practice for
Steel Bars, Selection Guide, Composition, and Mechanical
Properties
1
This standard is issued under the fixed designation A400; 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
1.1 This practice covers the selection of steel bars according
to section and to the mechanical properties desired in the part
to be produced. This is not a specification for the procurement
of steel. Applicable procurement specifications are listed in
Section 5.
1.2
Several steel compositions intended for various sections
and mechanical property requirements are presented in Tables
1-6. The criteria for placing a steel composition in one of the
three
general class designations, Classes P, Q, and R (described
in Section 4) are as follows:
1.2.1 Classes
P and Q should be capable of developing the
mechanical properties shown in Tables 1-4 by liquid quenching
from
a suitable austenitizing temperature, and tempering at
800°F (427°C) or higher. A hardness indicated by tests made at
a location shown in Fig. 1, A, B, or C, is taken as evidence that
a
composition is capable of meeting other equivalent mechani-
cal properties shown in the tables. Normal good shop practices
are assumed, with control of austenitizing and tempering
temperatures, and mild agitation of the part in the quenching
bath.
1.2.2 Class R should be capable of developing the mechani-
cal properties shown in Tables 5 and 6 as hot rolled, by cold
drawing,
or by cold drawing with additional thermal treatment.
The locations for obtaining tension tests are described in 6.2.
1.3
It is not implied that the compositions listed in the tables
are the only ones satisfactory for a certain class and mechanical
property requirement. Steels with lower alloy contents are
often satisfactory through the use of special processing tech-
niques.
1.4 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
2.1 ASTM Standards:
2
A108 Specification for Steel Bar, Carbon and Alloy, Cold-
Finished
A304 Specification for Carbon and Alloy Steel Bars Subject
to End-Quench Hardenability Requirements
A311/A311M Specification for Cold-Drawn, Stress-
Relieved Carbon Steel Bars Subject to Mechanical Prop-
erty Requirements
A322 Specification for Steel Bars, Alloy, Standard Grades
A633/A633M Specification for Normalized High-Strength
Low-Alloy Structural Steel Plates
A675/A675M Specification for Steel Bars, Carbon, Hot-
Wrought, Special Quality, Mechanical Properties
3. Significance and Use
3.1
If the desired mechanical properties are as described in
4.1.1 for material identified as Classes P-1 through P-7, or in
4.1.2 for material identified as Classes Q-1 through Q-7, the
strength
level desired can be based on hardness or the
equivalent tensile or yield strength as shown in Tables 1-4.If
the
desired mechanical properties are as set forth in 4.1.3 for
material identified as Classes R-1 through R-6, the strength
level is based on yield strength as shown in Tables 5 and 6.
3.2
The user, after determining the mechanical property
requirements of the critical section (that carrying the greatest
stress) of the part, should select the composition or composi-
tions from Tables 1-6 that fulfills these requirements and is
most
suitable for processing.
4. Classification
4.1 Steel bar compositions under this practice are classified
according to mechanical property requirements and the critical
section size of the part to be produced, as follows:
4.1.1 Classes P-1 through P-7 comprise bars for parts to
operate under severe service conditions requiring high yield
1
This practice 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, 2012. Published April 2012. Originally
approved in 1956. Last previous edition approved in 2006 as A400 – 69 (2006).
DOI: 10.1520/A0400-69R12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
strength (90 000 psi (621 MPa) and over), good ductility, and
relatively high notch toughness. The applicable section sizes,
identified as Classes P-1 through P-7, are shown in
Table 7.
The steel compositions suitable for Classes P-1 through P-7
and for various desired mechanical properties are listed in
Tables 1 and 2.
4.1.2 Classes Q-1 through Q-7 comprise bars for parts
operating under moderate service conditions requiring moder-
ate to high yield strength (75 000 to 185 000 psi (517 to 1276
MPa)), corresponding tensile-strength levels, and good ductil-
ity. The applicable section sizes, identified as Classes Q-1
through Q-7, are shown in
Table 7. The steel compositions
suitable for Classes Q-1 through Q-7 and various desired
mechanical properties are listed in
Tables 3 and 4.
4.1.3 Classes R-1 through R-6 comprise bars for parts
requiring a lower yield strength (30 000 to 120 000 psi (207
to 827 MPa)), with fair to good ductility. The applicable
section sizes, identified as Classes R-1 through R-6, are shown
in
Table 7. The steel compositions capable of developing the
various desired mechanical properties are listed in
Tables 5 and
6.
5. Applicable Procurement Specifications
5.1 For procurement of steel, it is recommended that the
following ASTM specifications of latest issue be used: Speci-
fication
A108, Specification A304, Specification A311/
A311M
, Specification A322, Specification A633/A633M, and
Specification
A675/A675M.
6. Location at Which Desired Properties Are Obtained
6.1 Classes P-1 Through P-7 and Q-1 Through Q-7—The
mechanical properties shown in
Tables 1-4 are based on
TABLE 1 Steels for Moderately Quenched Parts—Classes P-1 Through P-7
(Applicable to oil-quenching or equivalent rate of heat-removal.)
NOTE 1—Steels listed as approved for a certain section or strength may be used for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to SAE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
N
OTE 3—An H-steel with the same grade designation as a standard SAE-AISI steel is capable of meeting the same section and strength requirements
as the standard steel (see Specification
A304), and is the preferred method of specification.
N
OTE 4—Steels having a maximum carbon content of 0.40 % or over, or a hardness of HB 293 or over after heat-treating, are not recommended for
applications involving welding.
Desired Minimum
Hardness
Equivalent
Tensile
Strength, psi
A
Equivalent
Yield
Strength, psi
A
Minimum
B
As-Quenched
Hardness
Class
P-1 P-2 P-3 P-4 P-5 P-6 P-7
Diameter of Round (or Distance Between Faces of Square
or Hexagonal) Sections, in.
C
To
1
⁄
2
, incl Over
1
⁄
2
to 1,
incl
Over 1 to
1
1
⁄
2
, incl
Over 1
1
⁄
2
to 2, incl
Over 2 to
2
1
⁄
2
, incl
Over 2
1
⁄
2
to 3, incl
Over 3
to 3
1
⁄
2
,
incl
Thickness of Flat Sections, in.
C
HB HRC HB HRC
To 0.3, incl Over 0.3 to
0.6, incl
Over 0.6
to 1,
incl
Over 1
to 1.3,
incl
Over 1.3
to 1.6,
incl
Over 1.6
to 2.0,
incl
Over 2.0
to 2.3,
incl
229 to 293,
incl
20 to 33,
incl
110 000 to
145 000,
incl
90 000 to
125 000,
incl
388 42 1330
4130 50B30
5132
8630
Over 293
to 341,
incl
Over 33
to 38,
incl
Over 145 000
to 170 000,
incl
Over 125 000
to 150 000,
incl
409 44 1335 94B30 3140 4137 4142 9840 4337
3135 4135
4042 4640
5135 8640
8740
Over 341
to 388,
incl
Over 38
to 42,
incl
Over 170 000
to 190 000,
incl
Over 150 000
to 170 000,
incl
455 48 1340 4137 4140 4145 4147 4340
3140 6145 TS4140 9840 4337
4047 8642 86B45
4135 8645 94B40
5140 8742
8637
TS14B50
50B40
Over 388 to
429, incl
Over 42
to 45,
incl
Over 190 000
to 205 000,
incl
Over
170 000
to 185 000,
incl
496 51 1345 8645 5147 4142 8660 4147 4150 E4340
4063 8740 5155 4145 9840 4161 4161 9850
4068 8742 5160 4337 4340 TS4150
4140 9260 6150 8650 86B45
4640 9261 9262 8655
5145 TS4140 50B60
5150 50B46 94B40 51B60
8640 50B44 81B45
8642 50B50
A
1 psi = 0.006895 MPa.
B
Minimum as-quenched hardness for obtaining desired hardness after tempering at 800°F (427°C) or higher.
C
1 in. = 25.4 mm.
A400 − 69 (2012)
2
obtaining hardness test specimens from the locations shown in
Fig. 1, A, B, and C. For bars, the location should be at least
twice the diameter or minimum distance between faces from an
end; and for flat sections, at least twice the thickness from an
edge.
6.2 Classes R-1 Through R-6—The mechanical properties
shown in
Tables 5 and 6 are based on obtaining tension test
specimens from the following locations:
6.2.1 Center of bars or plates under 1
1
⁄
2
in. (38.1 mm) in
diameter or in distance between parallel surfaces, and
6.2.2 Mid-radius or a quarter of the distance between
parallel faces from the surface for larger sections.
7. Hardness Criteria for Quenched and Tempered Parts
7.1 Classes Q-1 Through Q-7—To obtain the properties
stated in
4.1.2 at the locations shown in Fig. 1, A, B, and C, a
microstructure containing a minimum of 50 % martensite is
necessary.
8. Keywords
8.1 steel bars
TABLE 2 Steels for Drastically Quenched Parts—Classes P-1 Through P-7
(Applicable to water-quenching or equivalent rate of heat-removal — See Note 5)
NOTE 1—Steels listed as approved for heavier sections or higher strengths may be used in the same conditions for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to ASE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
N
OTE 3—An H-steel with the same grade designation as a standard SAE-AISI steel is capable of meeting the same section and strength requirements
as the standard steel (see Specification
A304), and is the preferred method of specification.
N
OTE 4—Steels having a maximum carbon content of 0.40 % or over, or a hardness of HB 293 or over after heat-treating, are not recommended for
applications involving welding.
N
OTE 5—Parts made of steel with a carbon content of 0.33 % or higher, where the section is under 1 1/2 in. (38.1 mm) should not be quenched in
water without careful exploration for quench-cracking.
Desired Minimum
Hardness
Equivalent
Tensile
Strength, psi
A
Equivalent
Yield
Strength, psi
A
Minimum
B
As-Quenched
Hardness
Class
P-1 P-2 P-3 P-4 P-5 P-6 P-7
Diameter of Round (or Distance Between Faces of Square
or Hexagonal) Sections, in.
C
To
1
⁄
2
, incl Over
1
⁄
2
to 1,
incl
Over 1 to
1
1
⁄
2
, incl
Over
1
1
⁄
2
to
2, incl
Over 2
to 2
1
⁄
2
,
incl
Over 2
1
⁄
2
to 3, incl
Over 3
to 3
1
⁄
2
,
incl
Thickness of Flat Sections, in.
C
HB HRC HB HRC To 0.3, incl Over 0.3
to 0.6,
incl
Over 0.6
to 1.0,
incl
Over
1.0
to 1.3,
incl
Over 1.3
to 1.6,
incl
Over 1.6
to 2.0,
incl
Over 2.0
to 2.3,
incl
229 to 293,
incl
20 to 33,
incl
110 000 to
145 000,
incl
90 000 to
125 000,
incl
388 42 8625 4130 94B30
8627 5130
8630
50B30
Over 293
to 341,
incl
Over 33
to 38,
incl
Over 145 000
to 170 000,
incl
Over 125 000
to 150 000,
incl
409 44 4032 1330 1335 1340
D
3140 4137
4037 5132 5135 3135
D
4135 4337
4130 94B30 5140 4640 9840
5130 50B40 8637
D
8630 8640
TS14B35 8740
508B30
A
1 psi = 0.006895 MPa.
B
Minimum as-quenched hardness for obtaining desired hardness after tempering at 800°F (427°C) or higher.
C
1 in. = 25.4 mm.
D
These steels have insufficient hardenability for Class P-4, because of difference in test locations, but are satisfactory for other smaller sizes.
A400 − 69 (2012)
3
TABLE 3 Steels for Moderately Quenched Parts—Classes Q-1 Through Q-7
(Applicable to oil-quenching or equivalent rate of heat-removal.)
NOTE 1—Steels listed as approved for heavier sections or higher strengths may be used in the same conditions for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to ASE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
N
OTE 3—An H-steel with the same grade designation as a standard SAE-AISI steel is capable of meeting the same section and strength requirements
as the standard steel (see Specification
A304), and is the preferred method of specification.
N
OTE 4—Steels having a maximum carbon content of 0.40 % or over, or a hardness of HB 293 or over after heat-treating, are not recommended for
applications involving welding.
Desired Minimum
Hardness
Equivalent
Tensile
Strength,
psi
A
Equivalent
Yield
Strength,
psi
A
Minimum
B
As-
Quenched
Hardness
Class
Q-1 Q-2 Q-3 Q-4 Q-5 Q-6 Q-7
Diameter of Round (or Distance Between Faces of Square
or Hexagonal) Sections, in.
C
To
1
⁄
2,
incl
Over
1
⁄
2
to 1,
incl
Over 1
to 1
1
⁄
2,
incl
Over
1
1
⁄
2
to 2,
incl
Over 2
to 2
1
⁄
2,
incl
Over 2
1
⁄
2
to 3,
incl
Over 3
to 3
1
⁄
2,
incl
Thickness of Flat Sections, in.
C
HB HRC HB HRC To 0.3, incl
Over 0.3 to 0.6,
incl
Over 0.6
to 1.0,
incl
Over 1.0
to 1.3,
incl
Over 1.3
to 1.6,
incl
Over 1.6
to 2.0,
incl
Over 2.0
to 2.3,
incl
187 to 293, 91 (R
b
) 95 000 to 75 000 to 388 42 1330 8630 8637 3140 4140 4142
incl to 33, 145 000, 125 000, 4130 50B30 8740 TS4140
incl incl incl 5132 94B40
Over 293 Over 33 Over Over 409 44 1335 3140 8740 4137 TS4140 81B45 4142 4145 4147
to 341, to 38, 145 000 125 000 4042 50B30 4135 4140 4337
incl incl to to 5135 4640 8642 9840
170 000, 150 000, 94B30 8640 8645 86B45
incl incl 8742
Over 341 Over 38 Over Over 455 48 1340 8637 1345 8742 4142 94B40 51B60 4145 4147 4150
to 388, to 42, 170 000 150 000 3135 TS14B504137 TS4140 5147 8655 4337 4340
incl incl to to 3140 50B40 4140 50B50 5155 9840 86B45 TS4150
190 000, 170 000, 4047 5150 6150
incl incl 4135 8642
5140 8645
Over 388 Over 42 Over Over 496 51 1345 8645 4142 4145 9840 4147 4150 E4340
to 429, to 45, 190 000 170 000 4047 8740 5147 4337 4340 TS4150 9850
incl incl to to 4063 8742 5155 5160 8660
205 000, 185 000, 4068 9260 6150 8650 86B45
incl incl 4140 TS4140 9261 8655
4640 50B46 94B40 9262
5145 50B44 50B60
5150 50B50 51B60
8640 81B45
8642
A
1 psi = 0.006895 MPa.
B
Minimum as-quenched hardness for obtaining desired hardness after tempering at 800°F (427°C) or higher.
C
1 in. = 25.4 mm.
A400 − 69 (2012)
4
TABLE 4 Steels for Drastically Quenched Parts—Classes Q-1 Through Q-7
(Applicable to water-quenching or equivalent rate of heat-removal—See
Note 5)
NOTE 1—Steels listed as approved for heavier sections or higher strengths may be used in the same conditions for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to SAE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
N
OTE 3—An H-steel with the same grade designation as a standard SAE-AISI steel is capable of meeting the same section and strength requirements
as the standard steel (see Specification
A304), and is the preferred method of specification.
N
OTE 4—Steels having a maximum carbon content of 0.40 % or over, or a hardness of HB 293 or over after heat-treating, are not recommended for
applications involving welding.
N
OTE 5—Parts made of steel with a carbon content of 0.33 % or higher, where the section is under 1
1
⁄
2
in. (38.1 mm) should not be quenched in water
without careful exploration for quench-cracking.
Desired Minimum
Hardness
Equivalent
Tensile
Strength,
psi
A
Equivalent
Yield
Strength,
psi
A
Minimum
B
As-Quenched
Hardness
Class
Q-1 Q-2 Q-3 Q-4 Q-5 Q-6 Q-7
Diameter of Round (or Distance Between Faces of Square
or Hexagonal) Sections, in.
C
To
1
⁄
2,
incl
Over
1
⁄
2
to 1,
incl
Over 1
to 1
1
⁄
2,
incl
Over 1
1
⁄
2
to 2,
incl
Over 2
to 2
1
⁄
2,
incl
Over 2
1
⁄
2
to 3,
incl
Over 3
to 3
1
⁄
2,
incl
Thickness of Flat Sections, in.
C
HB HRC HB HRC To 0.3, incl
Over 0.3
to 0.6,
incl
Over 0.6
to 1.0,
incl
Over 1.0
to 1.3,
incl
Over 1.3
to 1.6,
incl
Over 1.6
to 2.0,
incl
Over 2.0
to 2.3,
incl
187 to 293, 91 (HRB) 95 000 to 75 000 to 388 42 1000 series, 4037 5135 5140
D
4640 3140
incl to 33, 145 000, 125 000, from 1024 to 4130 94B30 8637 8740
incl incl incl 1040, incl
E
5130 50B40
D
8625 5132
8627 8630
50B30
Over 293 Over 33 Over 145 000 Over 125 000 409 44 1036 to 1045,
E
1330 1335 1340
D
4135 4137
to 341, to 38, to 170 000, to 150 000, incl 5046 3135
D
8640 4140
incl incl incl incl 4032 5135 3140 8740 8642
8630 94B30 8637
D
8645
8742
TS4140
Over 341 Over 38 Over 170 000 Over 150 000 455 48 1335 3135 1340 1345 50B44
D
4140 4142
to 388, to 42, to 190 000, to 170 000, 4037 TS14B354042 3140 4137 8645 4337
incl incl incl incl 4130 4047 4135 4640
D
5147
5046 50B30 5140 5145
D
8742 6150
5130 8637 5150 TS4140 8650
5132 50B40 8640
D
9840
5135 94B30 8642 81B45
8635 8740
D
94B40
50B50
A
1 psi = 0.006895 MPa.
B
Minimum as-quenched hardness for obtaining desired hardness after tempering at 800°F (427°C) or higher.
C
1 in. = 25.4 mm.
D
These steels have insufficient hardenability for Class Q-4 parts because of different location of test specimens, but are satisfactory for smaller sections.
E
For these steels, the yield to tensile-strength ratio will usually be lower than 80 %.
A400 − 69 (2012)
5
TABLE 5 Steels for Parts Manufactured From Hot Rolled
A
and Cold Drawn
B,C
Bars—Classes R-1 Through R-6
NOTE 1—Steels listed as approved for heavier section or higher strengths may be used in the same conditions for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to ASE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
Hot-rolled 1000 series steels with a maximum carbon content of 0.40 % only are approved for welding. Only cold-drawn 1000 series steels used in
the strength level and section thickness for which hot-rolled steels of the same composition are approved may be welded, and in this case caution should
be exercised to see that excessive grain growth does not occur in the heat-affected zone.
Desired Minimum
Yield Strength,
psi
D
Class
R-1 R-2 R-3 and R-4 R-5 and R-6
Diameters of Round or Approximately Round Sections, in.
E
To
1
⁄
2
, incl Over
1
⁄
2
to 1, incl Over 1 to 2, incl Over 2 to 3, incl
Thickness of Flat Sections, in.
E
To 0.3, incl Over 0.3 to 0.6, incl Over 0.6 to 1.3, incl Over 1.3 to 2.0, incl
Over 30 000 to HR 1016 HR 1020 HR 1016 HR 1020 HR 1018 HR 1018
35 000, incl HR 1018 HR 1018 HR 1022 HR 1019 HR 1022
HR 1019 HR 1019 HR 1021 HR 1030
Over 35 000 to HR 1022 HR 1030 HR 1030 HR 1035
40 000, incl HR 1030 HR 1035 HR 1035
Over 40 000 to HR 1035 HR 1040 CD 1010 CD 1010 HR 1045
45 000, incl HR 1040 CD 1015
HR 1040
Over 45 000 to CD 1010 CD 1010 CD 1015 CD 1020 HR 1137
50 000, incl HR 1040 CD 1015 HR 1045 CD 1115
HR 1045 HR 1045 HR 1137 HR 1050
Over 50 000 to CD 1015 CD 1020 HR 1137 CD 1018 CD 1115 CD 1018 HR 1141
55 000, incl HR 1050 CD 1115 HR 1141 CD 1020 HR 1050 CD 1019 HR 1141
HR 1137 HR 1050 HR 1141 CD 1025
CD 1025 HR 1144
Over 55 000 to CD 1018 CD 1115 CD 1018 HR 1144 CD 1019 CD 1120 CD 1022 CD 1120
60 000, incl CD 1025 CD 1019 CD 1022 CD 1117
CD 1019 HR 1141 CD 1025 CD 1117 CD 1118
CD 1020 HR 1144
A
Hot-rolled bars are indicated in table by prefix “HR.”
B
Cold-drawn bars are indicated in table by prefix “CD.” These bars are produced by normal practice in cold-drawing and with no stress relief. Bars cold-finished by turning,
grinding, turning and polishing, etc., are not covered under cold-drawn bars, as such cold-finished bars have the properties of hot-rolled bars.
C
Classification of cold-drawn steels by size and yield-strength level in this table is based on yield-strength determinations at 0.2 % offset, or as determined by 0.005 in./in.
elongation under load for yield strengths up to 90 000 psi, incl, and by 0.006 in./in. elongation under load for yield strengths above 90 000 psi.
D
1 psi = 0.006895 MPa.
E
1 in. = 25.4 mm.
A400 − 69 (2012)
6
TABLE 6 Steels for Parts Produced From Cold-Drawn and Cold-Drawn Stress-Relieved Bars—Classes R-1 Through R-6
A,B
NOTE 1—Steels listed as approved for heavier section or higher strengths may be used in the same conditions for lighter sections and lower strengths.
N
OTE 2—Steel composition numbers correspond to ASE, AISI, or ASTM designations. Those in italics are no longer considered standard grades due
to decreased usage.
N
OTE 3—Steels in conditions listed in this table are not approved for applications involving welding.
Desired Minimum
Yield Strength,
psi
C
Class
R-1 R-2 R-3 and R-4 R-5 and R-6
Diameters of Round or Approximately Round Sections, in.
D
To
1
⁄
2,
incl Over
1
⁄
2
to 1, incl Over 1 to 2, incl Over 2 to 3, incl
Thickness of Flat Sections, in.
D
To 0.3, incl Over 0.3 to 0.6, incl Over 0.6 to 1.3, incl Over 1.3 to 2.0, incl
Over 60 000 to CD 1022 CD 1022 CD 1030 CD 1030
65 000, incl CD 1117 CD 1117 CD 1118
CD 1120 CD 1118
CD 1120
Over 65 000 to CD 1030 CD 1030 CD 1035 CD 1035
70 000, incl CDT 1040 CD 1035 CDT 1137 CD 1050
CD 1118 CDT 1045 CDT 1040 CDT 1141
CDT 1050 CDT 1045
Over 70 000 to CD 1035 CDT 1137 CD 1040 CD 1045
75 000, incl CDT 1045 CDT 1040 CDT 1141 CDT 1040
CDT 1050 CDT 1045 CDT 1144
CDT 1137
CDT 1050
Over 75 000 to CDT 1137 CD 1040 CD 1045 CD 1137
80 000, incl CDT 1040 CDT 1141 CDT 1040 CDT 1045
CDT 1050 CDT 1045 CDT 1144 CDT 1040
CDT 1137 CDT 1141
CDT 1050 CD 1050
Over 80 000 to CD 1040 CD 1045 CD 1137 CD 1141
85 000, incl CDT 1141 CDT 1040 CDT 1045 CDT 1137
CDT 1045 CDT 1144 CDT 1040 CDT 1045
CDT 1137 CDT 1141 CDT 1040
CDT 1050 CD 1050 CDT 1144
CDT 1050
Over 85 000 to CD 1045 CD 1137 CD 1141 CD 1144
90 000, incl CDT 1040 CDT 1045 CDT 1137 CDT 1141
CDT 1144 CDT 1040 CDT 1145 CDT 1137
CDT 1137 CDT 1141 CDT 1040 CDT 1045
CDT 1050 CD 1050 CDT 1144 CDT 1050
CDT 1050
Over 90 000 to CD 1137 CD 1141 CD 1144 CDT 1144
95 000, incl CDT 1045 CDT 1137 CDT 1141 CDT 1141
CDT 1040 CDT 1045 CDT 1137 CDT 1137
CDT 1141 CDT 1050 CDT 1045 CDT 1050
CD 1050 CDT 1144 CDT 1050
CDT 1050
Over 95 000 to CD 1141 CD 1144 CDT 1144 CDT 1144
100 000, incl CDT 1137 CDT 1141 CDT 1141 CDT 1141
CDT 1045 CDT 1137 CDT 1137
CDT 1040 CDT 1045 CDT 1050
CDT 1144 CDT 1050
CDT 1050
Over 100 000 to CD 1144 CDT 1144 CDT 1144 CDT 1144
105 000, incl CDT 1141 CDT 1141 CDT 1141
CDT 1137 CDT 1137
CDT 1045 CDT 1050
CDT 1050
Over 105 000 to CDT 1144 CDT 1144 CDT 1144
110 000, incl CDT 1141 CDT 1141
CDT 1137
CDT 1050
Over 110 000 to CDT 1144 CDT 1144
115 000, incl CDT 1141
Over 115 000 to CDT 1144
120 000, incl
A
Conditions and treatments of bars are indicated in this table by the symbols shown below. Bars cold-finished by turning, grinding, turning and polishing, etc., are not
covered, as such bars have the properties of hot-rolled bars.
“CD” = Bars produced by normal practice in cold-drawing, and with no stress relief.
“CDT” = Cold-drawn bars with subsequent thermal treatment. Heavier than normal drafts may be required.
B
Classification of cold-drawn steels by size and yield-strength level in this table is based on yield-strength determinations at 0.2 % offset or as determined by 0.005 in./in.
elongation under load for yield strengths up to 90 000 psi, and by 0.006 in./in. elongation under load for yield strengths above 90 000 psi.
C
1 psi = 0.006895 MPa.
A400 − 69 (2012)
7
D
1 in. = 25.4 mm.
TABLE 7 Applicable Classes for Critical Section Size
Round, Square, Hexagonal, etc.,
Sections, Diameter or Dimension
Between Opposite Faces, in.
A
Flat Sections, Thickness, in.
A
Applicable Class
Over
To and
Including Over
To and
Including
...
1
⁄
2
... 0.3 P-1,Q-1,orR-1
1
⁄
2
1 0.3 0.6 P-2, Q-2, or R-2
11
1
⁄
2
0.6 1.0 P-3, Q-3, or R-3
1
1
⁄
2
2 1.0 1.3 P-4, Q-4, or R-4
22
1
⁄
2
1.3 1.6 P-5, Q-5, or R-5
2
1
⁄
2
3 1.6 2.0 P-6, Q-6, or R-6
33
1
⁄
2
2.0 2.3 P-7 or Q-7
A
1 in. = 25.4 mm.
FIG. 1 Locations in Typical Cross Sections of Steel Bars at Which Desired Properties Are Obtained
A400 − 69 (2012)
8
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A400 − 69 (2012)
9
