|
Certificate of Analysis
STANDARD REFERENCE MATERIALS
1140, 1141, 1142
Ductile Iron Standards
| SRM
No. |
1140
Ductile Iron 1 |
1141
Ductile Iron 2 |
1142
Ductile Iron 3 |
| Element |
|
Percent |
|
| Carbon |
3.18 |
3.64 |
2.94 |
| Manganese |
0.725 |
0.480 |
0.183 |
| Phosphorous |
.0070 |
.073 |
.210 |
| Sulfur |
.010 |
.020 |
.015 |
| Sillicon |
1.92 |
1.11 |
3.33 |
| Copper |
0.096 |
0.204 |
1.02 |
| Nickel |
.028 |
.548 |
1.63 |
| Chromium |
.030 |
.138 |
.055 |
| Vanadium |
.030 |
.009 |
.006 |
| Molybdenum |
.095 |
.051 |
.023 |
| Titanium |
.096 |
.013 |
.008 |
| Aluminum |
(.01) |
(.005) |
.089 |
| Arsenic |
.072 |
.036 |
.010 |
| Magnesium |
.019 |
.044 |
.097 |
| Cerium |
(.09) |
(.05) |
(.015) |
| Yttrium |
(<.002) |
.040 |
.01 |
| Lead |
.0052 |
(.0009) |
(.0005) |
| Bismuth |
.0015 |
(.00008) |
(.00002) |
*Values in
parenthesis are not certified but are provided for additional
information on the composition.
SIZE AND
METALLURGICAL CONDITION: Samples are approximately 1 1/4
inches (3.2 cm) square and 1/2 inch (1.3 cm) thick; they were
chill-cast by a rapid unidirectional solidification technique.
CERTIFIED
PORTION: The certified portion for each sample is that
extending upward 5/16 inch (0.8 cm) from the chill-cast or
test surface (the largest surface opposite the numbered
surface). This portion only was analyzed in the cooperative
program for certification.
FINAL
CERTIFICATION: The value listed for an element is the
best estimate of the true value based on the results of the
cooperative analytical program. The value listed is not
expected to deviate from the true value by more than +
1 in the last significant figure reported; for a subscript
figure, the deviation is not expected to be more than +
5 in the subscript figure. Based on the results of homogeneity
testing, maximum variations within and among samples are
estimated less than the accuracy figures given above.
| Washington,
D.C. 20234 |
J. Paul Cali,
Acting Chief |
| February 24,
1970 |
Office of
Standard Reference Materials |
|
|
PLANNING, PREPARATION, TESTING,
ANALYSIS: The three ductile iron standards are made
available as a result of the cooperative program, between the
National Bureau of Standards and the American Cast Iron Pipe
Company, The standards were developed at the request of the
Ductile Iron Society and the American foundrymen's Society.
The material for the standards
was melted and cast at the American Cast Iron Pipe Company,
Birmingham, Alabama, with use of the NBS chill-cast mold
assembly. The preparation and homogeneity testing was
similar to that described in NBS Misc. Publ. 260-1, Standard
Reference Materials: Preparation of NBS White Cast Iron
Spectrochemical Standards, Robert E. Michaelis and LeRoy L.
Wyman, June 19, 1964.
Homogeneity testing was
performed at NBS by D. M. Bouchette and was found to be
satisfactory for the elements certified.
Cooperative analyses for
certification were performed at the American Cast Iron
Pipe Company, Birmingham, Alabama by I. Glaze, J. B. Hobby, W.
R. Kennedy, and R. N. Smith.
Analyses for final
certification at the National Bureau of Standards were
performed in the laboratories of the Analytic Chemistry
Division by J. R. Baldwin, D. M. Bouchette, M. M. Darr, E. L.
Garner, P. D. LaFleur, G. J. Lutz, E. J. Maienthal, M.
Margoshes, L. I. McClendon, T. J. Murphy, T. C. Rains, S. D.
Rasberry, T. A. Rush, B. A. Thompson, and J. L. Weber, Jr.
Technical measurements
performed at NBS for final certification were coordinated by
J. I. Shultz and J. L. Weber, Jr. under the chairmanship of
B.F. Scribner.
The technical and support
aspects involved in the preparation, certification, and
issuance of these Standard Reference Materials were
coordinated through the Office of Standard Reference materials
by R. E. Michaelis.
CAUTIONS:
-
Determinations made on
other than the chill-cast or test surface are not
recommended because of the unidirectional solidification
structure.
-
These chill-cast standards
are designed for calibration in the analysis of samples
prepared in the same manner; samples prepared by other
casting techniques or having other than a white structure
may result in considerable bias.
-
Because the samples exhibit
a change with respect to the columnar structure, both
among standards and from bottom to top of the certified
portion of the samples, the surface preparation for x-ray
spectroscopic analysis may be critical. (A
metallographic polishing technique is recommended).
-
Because of the poor heat
conductivity of the ductile irons, difference in
volatility rates for certain elements in emission
spectroscopic analysis may occur depending on the location
of the burn and the source parameters.
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Sample
Preparation - Spark Excitation (OE)
SPARK
STAND
FEATURE:
