Heat resistant steel 1.4776

1.4776 is an austenitic stainless steel. It is known for its good performance in high-temperature oxidation and corrosion resistance. This material shows excellent comprehensive properties in extreme temperature environments (from -253 degree to 700 degree ). Especially, it has a leading yield strength among similar alloys under 650 degree .

Chemical Composition: The core alloying elements are chromium (Cr), nickel (Ni), and silicon (Si). The chromium content supports its oxidation resistance, the nickel element enhances high-temperature stability, and the silicon component further improves corrosion resistance.
Corrosion Resistance: It can resist the erosion of most strong acids and alkalis, and remains stable in high-temperature sulfur-containing gases and oxidative environments. It is suitable for harsh working conditions such as chemical reactors and flue gas desulfurization devices.
Mechanical Properties: The tensile strength is 520 - 670 MPa, the yield strength is Greater than or equal to 205 MPa, and the elongation is Greater than or equal to 40%. It combines high hardness and good ductility to meet the structural reliability requirements under dynamic loads.

Energy Field: Pipeline of nuclear reactor cooling system, high-temperature components of petroleum cracking unit.
Aerospace: Fuel delivery pipe of rocket engine, high-temperature seal of turbine.
Industrial Equipment: Sintering machine grate, lining of chemical reaction kettle, corrosion-resistant components of pharmaceutical equipment.
Special Environment: Chloride ion corrosion-resistant components of offshore platforms, structural components of acid gas treatment system.

The surface treatment should adopt pickling and passivation processes to maximize the corrosion resistance potential. The roughness control is recommended to be Ra Less than or equal to 0.8 μm.
In continuous high-temperature working conditions, it is recommended to control the upper limit of the working temperature below 680 degree to ensure the material structure stability.
During cold working, a solution treatment at 1150 degree is required to eliminate work hardening and restore the plasticity of the material.

Through optimizing the alloy ratio, this material significantly improves the high-temperature strength and carburization resistance while maintaining the processing advantages of traditional austenitic stainless steel. It has now become the preferred material in high-end equipment manufacturing fields such as petrochemical and nuclear power.