A-A-52516
2.1.2 Particle size. The particle size of the powder shall be as specified in table I.
TABLE I. Particle size distribution by weight.
|
Sieve designation 1/ |
Percentage (%) by weight (Maximum) |
Weight passed through sieve |
Weight Retained on sieve |
|
|
Micrometer |
Mesh |
|||
|
75 |
200 |
5 |
|
X |
|
45 |
325 |
20 |
X |
|
1/ Sieve designation in accordance with ASTM E11.
2.1.3 Chemical composition. The chemical composition of the material shall conform to the percent by weight for each element as specified in table II.
TABLE II. Chemical composition.
|
Elements |
(%) by weight |
|
|
Minimum |
Maximum |
|
|
Carbon |
--- |
0.02 |
|
Chromium |
21.00 |
23.00 |
|
Aluminum |
9.00 |
11.00 |
|
Yttrium |
0.80 |
1.20 |
|
Phosphorus |
--- |
0.010 |
|
Sulfur |
--- |
0.010 |
|
Nitrogen 1/ |
--- |
0.020 (200 ppm) 2/ |
|
Hydrogen 1/ |
--- |
0.005 (50 ppm) |
|
Other elements, total 3/ |
--- |
0.50 |
|
Nickel |
Remainder |
|
1/ Determination of nitrogen and hydrogen elements shall not be required for acceptance.
2/ ppm = parts per million
3/ Other elements are the sum percentage of individual elements that may be present but not mentioned specifically in the composition. The producer normally shall analyze for only for impurities (elements) which are possibly present because of raw materials or manufacturing processes and which affect the product significantly. It is not implied by this statement that an analysis need be made for each element of the periodic table not mentioned specifically in the composition.
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