ASTM A675/A675M-90a(2000)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 675/A 675M – 90a (Reapproved 2000)
Standard Specification for
Steel Bars, Carbon, Hot-Wrought, Special Quality,
Mechanical Properties
This standard is issued under the fixed designation A 675/A 675M; 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 A 29/A 29M Specification for Steel Bars, Carbon and Alloy,
Hot-Wrought and Cold-Finished, General Requirements
1.1 This specification covers hot-wrought special quality
for
carbon steel bars and bar size shapes produced to mechanical
A 370 Test Methods and Definitions for Mechanical Testing
property requirements and intended for general constructional
of Steel Products
applications.
A 663/A 663M Specification for Steel Bars, Carbon, Mer-
1.2 The bars are available in nine strength grades designated
chant Quality, Mechanical Properties
45, 50, 55, 60, 65, 70, 75, 80, and 90 [310, 345, 380, 415, 450,
E 290 Test Method for Semi-Guided Bend Test for Ductility
485, 515, 550, and 620] corresponding to the minimum
of Metallic Materials
ultimate tensile strength in ksi [MPa]. The chemical composi-
tion is selected by the manufacturer to develop the required
3. Terminology
mechanical properties.
3.1 Definitions of Terms Specific to This Standard:
1.3 Hot-wrought special quality carbon steel bars subject to
3.1.1 special quality—Special quality bars are used when
mechanical property requirements are hot wrought in straight
end use, method of fabrication, or subsequent processing
lengths only. Sections and sizes available are covered in
treatment requires quality characteristics not available in mer-
Specification A 29/A 29M.
chant quality. Typical applications involve bending or machin-
1.4 Some applications may require one or more of the
ing for general constructional uses. Some end uses or fabricat-
available designations shown under Supplementary Require-
ing procedures can necessitate one or more requirements which
ments.
are described in the Supplementary Requirements.
NOTE 1—Merchant-quality hot-wrought carbon steel bars subject to
mechanical property requirements are covered in Specification A 663/
4. Ordering Information
A 663M.
4.1 Orders for material under this specification should
1.5 The values stated in either inch-pound units or SI units
include the following information:
are to be regarded separately as the standard. Within the text,
4.1.1 Quantity (weight or number of pieces),
the SI units are shown in brackets. The values stated in each
4.1.2 Name of material (hot-wrought special quality bars),
system are not equivalents, therefore each system must be used
4.1.3 Dimensions, including length,
independently of the other. Combining values from the two
4.1.4 Cross section (round, square, hexagon, equal leg
systems may result in nonconformance with the specification.
angle, etc.),
4.1.5 Specification designation and date of issue,
4.1.6 Grade designation (Table 1),
2. Referenced Documents
4.1.7 Leaded steel, if required (6.2),
2.1 ASTM Standards:
4.1.8 Copper bearing steel, if required (6.3),
4.1.9 Test report, if required (Section 10),
4.1.10 Supplementary Requirements or special require-
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
ments if required, and
Stainless Steel, and Related Alloys, and is the direct responsibility of Subcommittee
4.1.11 Application and processing.
A01.15 on Bars.
Current edition approved Aug. 31, 1990. Published October 1990. Originally
published as A 675–72 to replace A 306–64 (1972). Last previous edition A 675/
A 675M–90. Annual Book of ASTM Standards, Vol 01.05.
2 4
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Annual Book of ASTM Standards, Vol 01.03.
cation SA 675 in Section II of that Code. Annual Book of ASTM Standards, Vol 03.01.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 675/A 675M – 90a (2000)
TABLE 1 Tensile Requirements
B C
Grade Tensile Strength Yield Point, min Elongation, min, %
Designa-
ksi [MPa] ksi [MPa] 8 in. or [200 mm] 2 in. or [50 mm]
A
tion
Gage Length Gage Length
45 [310] 45 to 55 [310 to 380] 22.5 [155] 27 33
50 [345] 50 to 60 [345 to 415] 25 [170] 25 30
55 [380] 55 to 65 [380 to 450] 27.5 [190] 23 26
60 [415] 60 to 72 [415 to 495] 30 [205] 21 22
65 [450] 65 to 77 [450 to 530] 32.5 [225] 17 20
70 [485] 70 to 85 [485 to 585] 35 [240] 14 18
75 [515] 75 to 90 [515 to 620] 37.5 [260] 14 18
80 [550] 80 min [550 min] 40 [275] 13 17
90 [620] 90 min [620 min] 55 [380] 10 14
A
When lead is required, add the letter “L” after the grade designation, for example, 45L.
B
When the tension test does not show a yield point (drop of the beam, halt of the pointer or sharp-kneed stress-strain diagram), yield strength shall be determined by
either 0.5 % extension-under-load or 0.2 % offset. The minimum ksi (MPa) requirement does not change. The test report, if required, shall show yield strength.
C
See 7.1.1.3 through 7.1.1.6 for deduction in elongation due to section size.
NOTE 2—A typical ordering description is as follows: 10 000 lb, [5000
6.3 Copper-Bearing Steel—When required copper may be
kg] Hot Wrought Special Quality Carbon Steel Bars, 1 in. diameter 3 10
specified as an added element. Copper-bearing steel is identi-
ft, [25m 3 3m] Round, ASTM A 675/A 675M dated ____ , Grade 50,
fied by stating “copper-bearing” on the purchase order.
[345] Copper Bearing, Test Report Required, S3 Special Straightness,
6.4 When tension tests are waived in accordance with
Boiler Supports.
7.1.1.2, chemistry consistent with the mechanical properties
desired shall be applied.
5. Materials and Manufacture
5.1 Melting Practice—The steel shall be made by one or
7. Mechanical Properties
more of the following primary processes: open-hearth, basic-
oxygen, or electric-furnace. The primary melting may incor-
7.1 Tension Tests
porate separate degassing or refining and may be followed by
7.1.1 Requirements:
secondary melting using electroslag remelting or vacuum-arc
7.1.1.1 The material as represented by the test specimen
remelting. Where secondary melting is employed, the heat
shall conform to the applicable requirements in Table 1.
2 2
shall be defined as all of the ingots remelted from a single
7.1.1.2 Shapes less than 1 in. [645 mm ] in cross section
primary heat. 1
and bars (other than flats) less than ⁄2 in. [12.5 mm] in
5.2 Deoxidation:
thickness or diameter need not be subject to tension tests by the
5.2.1 Unless otherwise specified, the steel shall be rimmed,
manufacturer.
capped, semi-killed, or killed at the producer’s option. 3
7.1.1.3 For material over ⁄4 in. [19 mm] in thickness or
5.2.2 When required, the purchaser may specify the re-
diameter, a deduction of 0.25 % from the percentage of
quired deoxidation practice, dependent upon strength grade
elongation in 8 in. [200 mm] specified in Table 1 shall be made
specified, purchaser’s methods of fabrication, and end use 1
for each increase of ⁄32 in. [0.8 mm] in the specified thickness
requirements. Killed steels can be produced to coarse or fine 3
or diameter above ⁄4 in. [19 mm].
austenitic grain size (Supplementary Requirement S1).
7.1.1.4 For material under ⁄16 in. [8 mm] in thickness or
5.3 Condition—Unless otherwise specified, the bars shall be
diameter, a deduction of 2.00 % from the percentage of
furnished as-rolled and not pickled, blast cleaned, or oiled. At
elongation in 8 in. [200 mm] specified in Table 1 shall be made
the producer’s option, bars may be cleaned for inspection. 1
for each decrease of ⁄32 in. [0.8 mm] in the specified thickness
or diameter below ⁄16 in. [8 mm].
6. Chemical Composition
7.1.1.5 For Grades 45, 50, 55, 60, and 65 [310, 345, 380,
6.1 The steel shall conform to the chemical requirements
and 415] for material over 2 in. [50 mm] in thickness or
specified in Table 2.
diameter, a deduction of 1.00 % from the percentage of
6.2 Leaded Steel—When required, lead may be specified as
elongation in 2 in. [50 mm] specified in Table 1 shall be made
an added element. When lead is specified as an added element,
for each 1 in. [25 mm] of specified thickness or diameter or
a range from 0.15 to 0.35 % inclusive shall be furnished. Such
fraction thereof over 2 in. [50 mm] in thickness or diameter.
a steel is identified by adding the letter L after the grade
7.1.1.6 For Grades 70, 75, 80, and 90 [485, 515, 550 and
designation, for example 60L [415L].
620] for material over 2 in. [50 mm] in thickness or diameter,
a deduction of 1.00 % from the percentage of elongation in 2
in. [50 mm] specified in Table 1 shall be made for each 1 in.
TABLE 2 Chemical Requirements (Heat Analysis)
[25 mm] of specified thickness or diameter, or fraction thereof,
Element
over 2 in. [50 mm] in diameter or thickness, to a maximum
Phosphorus, max 0.040
deduction of 3 %.
Sulfur, max 0.050
7.1.2 Test Specimens:
Copper, when copper steel
...