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Copyright 2010 Performance Review Institute.  All rights reserved. t-frm-15                  1-Sep-10
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TRANSPORTATION
& POWER GENERATION AUDIT CRITERIA
TPG-AC7102/5 REV . NA
Issued 2011-12
Revised NA
Superseding NA
AUDIT CRITERIA
For HARDNESS TESTING
1. SCOPE
This checklist supplements PRI TPG7102 checklist. This checklist applies to suppliers seeking accreditation for Heat Treating.
2. GENERAL INFORMATION:    2.1 Company:    2.2 Company contact    2.3 Auditor    2.4  Initial Audit  Reaccreditation Audit  VCA Audit    2.5 Tests Audited:      Brinell Hardness  (ASTM E10 or EN ISO 6506)      Rockwell Hardness  (ASTM E18 or EN ISO 6508)      Vickers Hardness  (ASTM E384 or EN ISO 6507) – Used for Macro Vickers only
Portable (ASTM E110)    2.6 Brief Equipment Description
PROCEDURES
3. WRITTEN
3.1 Do written procedures cover the following testing variables:
a. Number of impressions for each test value reported? YES NO
b. In-process periodic verifications and recording? YES NO
YES NO
3.2 Do written procedures cover operator options for hardness re-
testing? (Some operator discretion is permitted).
3.3 Are the sample sizes (or 100%) required by the specifications and
YES NO the acceptance range for hardness testing of each order of parts
listed on the job planning or on a controlled media traceable to the
individual part number?
4. PERSONNEL AND TRAINING
4.1 Verify personnel training for one testing discipline:
Function/Job Description: ______________________________________
Equipment
operated: ______________________________________ 4.2 Is training documented? YES NO
4.3 Do written procedures reference hardness training?  YES NO
4.4 Does training include all geometries of parts tested in the facility?  YES NO
5. FACILITIES, EQUIPMENT AND MAINTENANCE
YES NO
5.1 Is hardness equipment capable of performing the tests in accordance with
all applicable requirements?
5.2 Is the equipment designed such that no rocking or lateral movement
YES NO occurs while load is being applied or removed?
5.3 Does supplier have a preventive maintenance plan in place?  YES NO
5.4 Is preventive maintenance plan followed? YES NO
5.5 Is performed preventive maintenance documented? YES NO
6. CALIBRATION
6.1 Are calibration records available? YES NO
YES NO
6.2 Do records show that calibration is traceable to national standards? (NIST,
UKAS, PTB, etc.)?
6.3 Is calibration performed in accordance with applicable requirements?  YES NO
7. MATERIAL IDENTIFICATION AND CONTROL
7.1 Is the traceability of the hardware to the purchase order always kept during
YES NO the hardness testing?
METHODS NA 8. ALTERNATIVE
8.1 Are alternative methods used only when permitted by one of the following? YES NO
(Check all applicable items below).
Material specification.
Customer
Other, as described below:
___________________________________________________
CONVERSION NA 9. HARDNESS
YES NO NA 9.1 Are conversion charts used if alloy groups are not covered by ASTM E140 or EN
ISO 18265?
9.1.1 Are these charts approved by the customer? YES NO
9.2 When conversion is used, do the inspection records show the measured
YES NO values as well as the converted values (i.e. conversion from another
hardness scale or from tensile test)?
10. TEST
REPORTS
YES NO
10.1 Do test reports show the hardness number and appropriate scale per
customer requirements?
10.2 If conditions are other than normal operating conditions (ball
YES NO NA diameter/load/load time/etc.), are those conditions reported as required?
10.3 Are the actual hardness values recorded as required? YES NO
10.4 Is test temperature reported if ambient temperature was outside of 10° -
YES NO NA 35°C (50° - 95°F) (unless it has been shown not to affect the measurement
result)?
11. HARDNESS PERIODIC VERIFICATION
(The Auditor to check several standard test blocks)
YES NO 11.1 Are standardized test blocks available for the scales/loads/and other key
documented evidencevariables that are used for production testing?
11.1.1 Do standardized test blocks appear to be in a condition suggesting
acceptable verification, including:
11.1.1.1 Surfaces not re-polished? YES NO
11.1.1.2 Indentations only on the allowable test surface? YES NO
11.1.1.3 Number of indentations appears to be relatively the same or more than
YES NO those reported for periodic verifications?
11.2 Are the standardized test blocks being used appropriate for the materials
YES NO being tested?
11.3 Is each standardized test block marked with the scale, the mean hardness
YES NO value, the standard supplier identification and the block serial number?
11.4 Is hardness tester periodically verified against standardized test block(s) at
the following minimum frequencies:
11.4.1 Daily, prior to the start of acceptance testing?  YES NO
11.4.2 After the load/indenters (all methods) are changed?  YES NO
11.4.2.1 Does the log book record when load/indenters are changed? YES NO
YES NO 11.5 Is hardness tester verified against standardized test block(s) representing
the indenter, load and time used for production testing?
YES NO 11.6 Are hardness tester periodic verifications recorded, complete, and the
standardized test block identified?
11.7 Is there evidence that indentations that are spaced too closely are
YES NO disregarded?
YES NO 11.8 Do written procedures define the action to take if periodic verifications
result in an out-of-tolerance condition, including direction to retest all tests
performed since the last correct periodic verification unless the suspect
population can be further restricted?
12. BRINELL HARDNESS TESTING (ASTM E10 or EN ISO 6506) NA 12.1 Brinell Equipment Operating Characteristics
12.1.1 Does the measuring scope permit direct measurement of the indentation
YES NO diameter as required by scope type (ASTM E10 Table 2) or permitting
estimation of the indentation diameter to ±0.5% (EN ISO 6506-2 paragraph
4.4.1)?
Note:
ASTM E10 Table 2 –applies only to Type A devices. This
requirement does not apply to Type B devices. It is a fixed requirement for
1mm ball only.
12.2 Brinell Equipment Daily Verifications
12.2.1 If testing to ASTM E10, are daily verifications performed on each range to
YES NO NA be used that day?
YES NO NA 12.2.2 If testing to ASTM E10, are at least two hardness tests performed on each
of the daily verification standardized test blocks?
12.2.3 Is the center of indentation no closer than 2 ½ times its diameter to the
YES NO edge of the specimen or the edge of another indentation?
YES NO NA 12.2.4 If the machine fails the verification test, is the appropriate action taken to
adjust and verify the hardness equipment?
Note: Requirement is to check the two (or more) readings against the
standard value and the maximum permitted error. If the difference is
outside that limit, then the repeatability is calculated. If the calculated error
and the repeatability are within the requirements, the machine is OK to
use.
Option for repeat test exists with different ball or indenter.
If it fails again, the machine must be tested by the indirect verification
method.
If it fails daily verification, the measuring device must also be checked
against the reference indentations on the standardized test block.
12.3 Specimens for Brinell Testing
YES NO
12.3.1 Is the thickness of the specimen such that no bulge or other markings
show the effects of the test force on the side opposite the indentation?
(As a general rule, the thickness of the specimen should be at least 10
times the depth of the indentation).
YES NO NA 12.3.1.1 If testing to EN ISO 6506-1, is the thickness of the specimen at least 8
times the depth of the indentation?
YES NO NA 12.3.2 If testing to ASTM E10, is the specimen radius of curvature greater than
2.5x the indenter diameter (25mm for a 10mm indenter, etc.)?
12.4 Brinell Test Cycle (For One Indentation)
12.4.1 Is the major load applied steadily, without a jerk? YES NO
YES NO
12.4.2 Is the load applied for a time of 10 to 15 seconds, unless otherwise
required by the product?
12.4.2.1 If other than 10 to 15 seconds is used, is the time reported? YES NO NA 12.5 Brinell Hardness Readings
YES NO
12.5.1 For each indentation, are two diameters at 90° (perpendicular) measured
and the mean used to calculate hardness?
(Note: Automated test machines may convert from indentation depth or
from an assessment of the projected indentation area into the material
surface).
13. ROCKWELL HARDNESS TESTING (ASTM E 18 or ISO 6508) NA 13.1 Rockwell Equipment Operating Characteristics
YES NO
13.1.1 Is the equipment protected from environment induced vibrations during
tests?
13.2 Rockwell Equipment Periodic Verifications and Calibrations
YES NO NA 13.2.1 If testing to ASTM E18, do indirect verification and/or calibration test
reports include evidence of “As found” condition, indenters verified with the
test machine and final calibration results?
YES NO
13.2.2 Is the center to center spacing between indentations on the standardized
test block kept at a minimum distance as defined by the applicable
specification?
YES NO
13.2.3 Are at least two preliminary indentations (results ignored) made to ensure
smooth operation and seating of indenter/anvil when the indenter/anvil is
changed?
YES NO NA 13.2.4 If testing to ASTM E18, are at least two measurements distributed
uniformly over the test surface performed on each of the daily verification
standardized test blocks?
YES NO NA 13.2.4.1 If testing to EN ISO 6508, is at least one measurement performed on each
of the daily verification standardized test blocks? (EN ISO 6508-1 Appendix
E)
YES NO NA 13.2.5 If testing to ASTM E18, are procedures and methods for determination of
error and repeatability (as applicable) for all verifications and/or calibrations
in accordance with the requirements?

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