A297 HC
ASTM
A297 HC
ASME
SA297 HC
Type
28Cr
AISI
446
UNS -Cast
J92605
UNS -Wrought
S44600
Overview
Grade HC is an austenitic stainless steel casting alloy specified under ASTM A297/A297M, intended for high-temperature applications where resistance to oxidation and carburization is critical. With a nominal composition of approximately 25% chromium and 20% nickel, HC provides a stable microstructure and good mechanical strength at elevated temperatures. This alloy is commonly used in components such as heat-treat furnace fixtures, radiant tubes, and thermal processing equipment operating under continuous or cyclic heat. Grade HC offers a balance of creep resistance, corrosion protection, and thermal fatigue strength, making it suitable for service in petrochemical, metallurgical, and industrial heating environments.
Chemical Composition
Carbon
Manganese
1.00% Max
Silicon
2.00% Max
Phosphorus
0.04% Max
Sulfur
0.04% Max
Chromium
26.00 - 30.00%
Nickel
4.00 - 7.00%
Molybdenum
0.50% Max
Physical Properties
Tensile Strength
55 ksi Max
Resources
ASTM Standard