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Standard Specification for Cast Tool Steel
This specification covers tool steel compositions appropriate for usable shapes cast by pouring directly into suitable molds and for master heats for remelting and casting.
Grades of the tool steel covered in this specification include air- and oil-hardening grades such as CA-2, CD-2, CD-5, CM-2, CS-5, CS-7, CH-12, CH-13, and CO-1.
The steel shall be made by one or more of the following processes: electric-arc furnace or induction furnace and may be argon-oxygen decarburization refined.
Each of the steel shall undergo chemical analysis and shall conform to the chemical composition specification for:
Material shall be packed and marked with heat or lot number, specification number, steel type, and form to ensure safe delivery and proper identification.
1.1 This specification covers tool steel castings having chemical compositions similar to those of the standard wrought grades.
1.2 Several grades are covered and are designated by chemical composition shown in Table 1.
| Composition, % | ||||||
| Grade | CS-7 | CH-12 | CH-13 | CD-51 | ||
| Element | UNS | T91907 | ||||
| Carbon | 0.45–0.55 | 0.30–0.40 | 0.30–0.42 | 0.85–1.00 | ||
| Manganese | 0.40–0.80 | 0.75 max | 0.75 max | 1.00–1.30 | ||
| Silicon | 0.60–1.00 | 1.50 max | 1.50 max | 1.50 max | ||
| Sulfur | 0.03 max | 0.03 max | 0.03 max | 0.03 max | ||
| Phosphorus | 0.03 max | 0.03 max | 0.03 max | 0.03 max | ||
| Chromium | 3.00–3.50 | 4.75–5.75 | 4.75–5.75 | 0.40–1.00 | ||
| Molybdenum | 1.20–1.60 | 1.25–1.75 | 1.25–1.75 | ... | ||
| Vanadium | ... | 0.20–0.50 | 0.75–1.20 | 0.30 max | ||
| Cobalt | ... | ... | ... | ... | </ | |
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