ASTM A743 – Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
This specification covers iron-chromium and iron-chromium-nickel alloy castings for general corrosion-resistant application. The grades covered by this specification represent Types of alloy castings suitable for broad ranges of application which are intended for a wide variety of corrosion environments.
Grade (UNS): CA6NM (J91540)
Process:
The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen decarburization (AOD).
Heat Treatment:
Heat to 1850°F [1010°C] minimum, air cool to 200°F [95°C] or lower prior to any optional intermediate temper and prior to the final temper. The final temper shall be between 1050°F [565°C] and 1150°F [620°C].
Chemical Requirements: Composition, max,%
| Elements | CA6NM (J91540) |
| Carbon | 0.06 |
| Manganese | 1.00 |
| Silicon | 1.00 |
| Phosphorus | 0.04 |
| Sulfur | 0.03 |
| Chromium | 11.5-14.0 |
| Nickel | 3.5-4.5 |
| Molybdenum | 0.40-1.0 |
Tensile Requirements: (shall not apply unless specified in the purchase order)
| Grade Symbol | CA6NM (J91540) |
| Tensile Strength,min, ksi [Mpa] | 110[755] |
| Yield Strength, min,ksi [MPa] | 80[550] |
| Elongation in 2 in.[50 mm],min, % | 15 |
| Reduction of Area,min, % | 35 |