HU A297/A297M
Grade：HU (CENT, INVEST, SAND)
Type：19 Chromium, 39 Nickel
Chemical Requirements（Composition, %）：
Carbon：0.35–0.75
Manganese, max：2.00
Silicon, max：2.50
Phosphorus, max：0.04
Sulfur, max：0.04
Chromium Nickel：17.0–21.0
Nickel：37.0–41.0
Molybdenum, max：0.50
Tensile Requirements
Tensile Strength, min
ksi ：65
[MPa]：450
Elongation in 2 in. [50 mm], min, % ：4
Heat Treatment
Castings for heat-resistant service may be shipped in the as-cast condition without heat treatment. If heat treatment is required, the treatment shall be established by mutual agreement between the manufacturer and the purchaser and shall be so specified in the inquiry, contract, or order.