F959 Chemical Requirements, Heat Analysis
| Element |
Type 325 and 490 |
Type 325-3 and 490-3 |
| Carbon |
0.30 - 0.55% |
|
| Manganese |
0.50 – 0.90% |
|
| Phosphorous, max |
0.040% |
0.040% |
| Sulfur, max |
0.045% |
0.050% |
| Silicon |
0.15 – 0.35% |
0.15 – 0.35% |
| Chromium |
|
0.45 – 0.65% |
| Nickel |
|
0.25 – 0.45% |
| Copper |
|
0.25 – 0.45% |
- Weathering steel DTIs may also be made from any of the type 3 steels listed in A325 and F436
- Weathering Steel DTIs having Copper, Sulfur, and Phosphorous conforming to the above, and having a Corrosion Resistance Index of 6 or higher calculated on the basis of the heat analysis as described in Guide 101 Predictive Method based on the data of Larabee and Coburn shall be considered acceptable.
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