ALLOY GRADES |
SERVICE LIMIT ° C (° F) |
DESCRIPTION |
APPLICATIONS |
HC |
650 (1200) |
Restrict to low stress applications. Resists oxidation and high sulfur flue gas. |
Tuyeres, gas dampers, salt pots, support skids. |
HD |
700 (1300) |
Higher nickel yields improved strength.
Resists high sulfur process gas. |
Pour spouts, holding pots, kiln parts, gas parts. |
HE |
1095 (2000) |
Higher chrome and nickel bring greater strength and ductility. |
Furnace chains, ore roasting equipment. |
HF |
870 (1600) |
Economical heat resistant grade with sufficient chrome and nickel for good oxidation resistance. |
Burner tips, furnace rails, annealing boxes, trays, burnishing rolls. |
HH Type I
HH Type II |
980 (1800)
980 (1800) |
Group of alloys very sensitive to composition balance. Suitable for a wide range of high temperature applications. |
Rable arms, radiant tubes, refractory support hardware, grate bars. |
HI |
980 (1800) |
Good strength, ductility, and corrosion resistance. |
Billet skids, rails, tube spacers. |
HK |
1025 (1875) |
Increased strength for more highly stressed applications. Good resistance to oxidizing or reducing process flow. |
Calcining tubes, pier caps, high temperature fixtures and hardware. |
HL |
1025 (1875) |
Provides strength levels of HK with improved corrosion resistance to hot gases. |
Similar to HN. |
HN |
980 (1800) |
Provides strength levels of HT with better ductility. |
Furnace skids for slabs, bars, furnace fixtures. |
HP |
1050 (1925) |
Higher chrome and nickel content provides increased strength and resistance to both oxidation and carburization. |
Reformer and Ethylene pyrolysis tubes and fittings. |
HT |
980 (1800) |
Good strength at heat treating temperatures.
Resists thermal shock of repeated heating and cooling. |
Dampers, pots, blades, rolls, door frames, retorts, rolling mill guides. |
HX |
1150 (2100) |
For severe hot gas corrosion resistance at higher temperatures. |
Hearth plates, muffles, roller hearths, carburizing boxes. |
HU |
1150 (2100) except 1095 (2000) for high sulfur gases. |
High temperature thermal fatigue with better corrosion resistance than HT. |
Carburizing retorts, furnace rolls, trays, radiant tubes. |
HW |
1120 (2050) |
Not as strong as HT but high nickel content delivers excellent carburization resistance. |
Cyanide pots, retorts, molten lead heating elements. |
Disclaimer: The data and information here are believed to be reliable. However, this material is not intended as a substitute for competent professional engineering assistance which is a requisite to any specific application. MetalTek International , its companies or businesses, makes no warranty and assumes no legal liability or responsibility for results to be obtained in any particular situation, and shall not be liable for any direct, indirect, special or consequential damages therefrom. This material is subject to revision without prior notice.
