ASTM B724-00(2006)
(Test Method)Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Newage, Portable, Non-Caliper-Type Instrument (Withdrawn 2013)
Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Newage, Portable, Non-Caliper-Type Instrument (Withdrawn 2013)
SIGNIFICANCE AND USE
The instrument may be used on a variety of geometries of aluminum alloy test pieces, providing the surface being tested has proper support for the instrument.
This test method is intended for quality assurance and production control purposes. This test method is not intended to be an independent material-acceptance test.
The thickness of the test piece shall be such that a mark or bulge is not produced on the reverse side of the test piece and the test piece does not deflect during the test.
Calibration of the instrument through the use of reference blocks is required for true comparative hardness values.
SCOPE
1.1 This test method covers indentation hardness testing of aluminum alloys using a Newage, portable, non-caliper-type, hardness instrument which provides readout values numerically equivalent to Rockwell B-scale as determined by Test Methods E 18.Note 1
This is a comparative Rockwell B test and does not provide an actual Rockwell B test value. HRBN, the values obtained from the Newage instrument, are numerically equivalent to Rockwell B values, but do not represent an actual Rockwell B test in accordance with Test Methods E 18.
1.2 This test method measures indentation hardness of heat-treatable aluminum alloys having a hardness from 30 to 100 HRBN, a thickness greater than 1.50 mm (0.060 in.), and pieces too large to be tested by a caliper type instrument. Note 2
This test method covers two instruments (one analog and one digital) which operate differently. Refer to the manufacturer's instruction for proper operation.
1.3 The flat surface size of the area being tested must be compatible with the instrument support area and the material must not deflect during the test.
1.4 The values stated in SI units are the standard. The values given in parentheses are for information only.
WITHDRAWN RATIONALE
Formerly under the jurisdiction of Committee B07 on Light Metals and Alloys, this test method was withdrawn in October 2013. This standard is being withdrawn without replacement because (1)the standard covers one particular instrument that is no longer available from the manufacturer, and (2) comparative test data show that the reproducibility is inadequate.
General Information
Relations
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: B724 − 00(Reapproved 2006)
Standard Test Method for
Indentation Hardness of Aluminum Alloys by Means of a
Newage, Portable, Non-Caliper-Type Instrument
This standard is issued under the fixed designation B724; 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.
1. Scope E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers indentation hardness testing of
aluminum alloys using a Newage, portable, non-caliper-type,
3. Terminology
hardness instrument which provides readout values numeri-
3.1 Definitions:
cally equivalent to Rockwell B-scale as determined by Test
3.1.1 Definitions of terms relating to hardness testing ap-
Methods E18.
pearing in Test Methods E18 shall apply to terms used in this
NOTE1—ThisisacomparativeRockwellBtestanddoesnotprovidean
test method.
actual Rockwell B test value. HRBN, the values obtained from the
3.1.2 HRBN—The suffix “N,” added to the HRB scale
Newage instrument, are numerically equivalent to Rockwell B values, but
designation, indicates hardness numbers derived using this test
do not represent an actual Rockwell B test in accordance with Test
method which can be related to, but are not necessarily
Methods E18.
identical to, Rockwell-B (HRB) values obtained in accordance
1.2 This test method measures indentation hardness of
with Test Methods E18. When reporting results derived using
heat-treatable aluminum alloys having a hardness from 30 to
this test method, this designation should follow the numeric
100 HRBN, a thickness greater than 1.50 mm (0.060 in.), and
value.
pieces too large to be tested by a caliper type instrument.
4. Summary of Test Method
NOTE 2—This test method covers two instruments (one analog and one
digital) which operate differently. Refer to the manufacturer’s instruction 4.1 A portable hand-held and hand-operated instrument
for proper operation.
rests firmly upon an aluminum alloy surface. The manual
downward movement of the tester in a steady, even and
1.3 The flat surface size of the area being tested must be
compatible with the instrument support area and the material synchronous manner toward the surface moves a penetrator
must not deflect during the test. into the surface. Depth of penetration between preload and full
loadasreflectedonthedisplayoftheunit,(dialordigital)isan
1.4 ThevaluesstatedinSIunitsarethestandard.Thevalues
indication of the hardness value.
given in parentheses are for information only.
4.1.1 The indicator of dial read-out units is read while the
tester is in the fully depressed position, while the digital
2. Referenced Documents
display of digital read-out units is read when the tester is in the
2.1 ASTM Standards:
fully released position, since the reading is automatically
B648 Test Method for Indentation Hardness of Aluminum
locked in at the preload position as the unit is being released.
Alloys by Means of a Barcol Impressor
NOTE 3—Another portable non-caliper-type instrument is employed in
E18 Test Methods for Rockwell Hardness of Metallic Ma-
Test Method B648. One hand is used to operate the instrument. Hardness
terials
numbers are given as Barcol Impressor readings.
E177 Practice for Use of the Terms Precision and Bias in
5. Significance and Use
ASTM Test Methods
5.1 The instrument may be used on a variety of geometries
of aluminum alloy test pieces, providing the surface being
This test method is under the jurisdiction of ASTM Committee B07 on Light
tested has proper support for the instrument.
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
Testing.
5.2 This test method is intended for quality assurance and
Current edition approved Sept. 1, 2006. Published September 2006. Originally
production control purposes. This test method is not intended
approved in 1983. Last previous edition approved in 2000 as B724 – 00. DOI:
to be an independent material-acceptance test.
10.1520/B0724-00R06.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 The thickness of the test piece shall be such that a mark
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
or bulge is not produced on the reverse side of the test piece
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and the test piece does not deflect during the test.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B724 − 00 (2006)
5.4 Calibration of the instrument through the use of refer- 7.2 During operation, the indenter is impressed slowly and
ence blocks is required for true comparative hardness values. smoothly into the surface of the material being tested. Lateral
movement or rocking may damage the indenter.
6. Apparatus
7.3 When temperature of test piece exceeds 23°C (73°F),
6.1 Newage, Portable, Non–Caliper–Type Instrument, con-
lower hardness values may result.
taining means of applying the desired loads, an indenter and an
indicating device. This instrument interacts through hand
8. Test Piece
power and spring load to indent.
8.1 The test piece shall be a portion of the material whose
6.1.1 The indenter of dial read-out units shall consist of a
area is suitable for testing (see 8.2 and 8.3).
carbide tip bonded to a threaded shaft. The tip is conical, and
it shall have an included angle of 110.0 6 1.0°. The top of the
8.2 The surface area of the material in contact with the base
cone shall possess a flat surface of 160.0 6 10.0 µm in
area of the testing device must be free of debris and extreme
diameter. The indenter of digital read-out units shall consist of
irregularity.
a diamond bonded to a threaded shaft. The tip is conical, and
8.3 The contact area of the indenter shall be smooth, clean,
shall have an included angle of 100° 6 1° and a flat area of 62
and free of mechanical damage. The surface may be lightly
6 2 µm in diameter.
polished to eliminate die lines, scratches, laps, seams and
NOTE 4—A single indenter and load combination are used in each
surface cracks prior to hardness testing, provided the surface
instrument. The combination of load and indenter produces a result
hardness is not affected. A surface finish of 3.2 µm or finer is
numerically equivalent to Rockwell B.
recommended.
6.1.2 A dial scale having graduations of at least every two
hardnesspoints,HRBNshallindicatehardnessondialread-out
9. Calibration
units. Digital read-out units shall have a digital display
9.1 Calibration of Aluminum-Alloy Reference Hardness
resolution of 0.1 hardness points HRBN. The range of either
Blocks—Using a Rockwell bench-type machine, calibrated in
unit shall encompass at least from 30 to 100 HRBN.
accordance with Test Methods E18, an aluminum-alloy refer-
6.1.3 For each hardness point, HRBN, the penetration of the
ence block should be tested and calibrated in accordance with
indenter of a dial read-out or digital read-out unit can be
that method. Using the “B” scale, uniformly distribute five
estimated from Fig. 1. This relationship may vary with the
impressions within a 50 mm by 50 mm (2 by 2 in.) area of the
alloy and temper being used.
reference block. Read the dial of the Rockwell-type bench
6.1.4 The dial read-out test instrument shall apply a preload
machine to the nearest 0.1 HRB value. The difference between
of 4 N and a full load of 49 N, while the digital unit shall apply
thelargestandsmallestofthefivereadings(repeatability)shall
apreloadof12Nandafullloadof49N.Thehardnessnumber
not exceed 1.5 HRB units.
is the distance traveled by the penetrator between the pre-load
and full load, as indicated on the dial of the instrument.
NOTE 5—The Rockwell bench-type machine should also be calibrated
using NIST traceable Rockwell B test blocks, when these become
available.
7. Hazards
7.1 This instrument is delicate. Extended use in a substan- 9.1.1 The 50 mm by 50 mm area of the reference block
tially dusty or corrosive environment may lead to erroneous which contains the five calibration hardness impressions shall
results. be suitably delineated at its boundaries and designated as the
FIG. 1 Depth of Penetration in Rockwell B Tests of Some Brass
B724 − 00 (2006)
Newage, portable instrument, calibration area. Mark the refer- ensurethattheindenterisperpendiculartothetestareaandthat
ence blocks with the average of the five hardness readings the instrument is operated in accordance with the procedures
made in accordance with 9.1.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.