Nickel RA 85H

Annealing Procedure

Soak at 2050 F(1120 C), water quench. For stress relieving, heat to 1850 F(1010 C), furnace cool till black then air cool.

Applications

Initially used in primarily the heat treating industry, this alloy is becoming popular with a variety of other applications including coal conversion and incineration equipment. With twice the creep strength of standard 310s, it is a good choice for hostile environments with its resistance to hot corrosives.

Formability

This alloy will exhibit characteristics similar to austenitic stainless steels. It can be successfully formed using all common methods.

Hardening Procedure

This alloy will not harden in response to thermal treatment.

Machinability

This alloy, due to its' alloy content can be tough to machine. Slow speeds, constant feeds and abundant lubricant will optimize success in all operations.

Principle Design Features

This high silicon alloy combines resistance to carburization, oxidation, sulfidation and hot salt corrosion with good strength and fabricability.

Weldability

The high level of silicon in this alloy requires the use of great care to achieve sound welds. For GMAW welding, do not add oxygen in the shielding gas and keep interpass temperatures below 300 F(150 C). For GTAW, use argon shielding gas with 25% helium added for manual operations. Choice of filler metal should consider the need for ferrite deposition in the weld bead. For spray arc transfer methods, 80% minimum argon is required. Keep interpass temperatures under 212 F(100 C) and use the lowest inputs necessary to remain in the spray arc transfer range. Preheating and postweld annealing is not required with this material.