Nickel base alloy is a kind of alloy which has high strength and certain oxidation corrosion resistance at high temperature of 650 ~ 1000℃. According to the main performance, nickel based alloy can be subdivided for nickel base heat-resisting alloy, nickel base corrosion resistance alloy, nickel base wear resistance alloy, nickel base precision alloy and Ni based shape memory alloy. According to the different matrix, the high temperature alloy is divided into ferrum based high temperature alloy, nickel based high temperature alloy and cobalt base high temperature alloy. Nickel based high temperature alloy referred to as the nickel base alloy.

Nickel based alloys are used in many fields:
1.Ocean: marine structure of sea area, sea water desalination, seawater aquaculture, sea water heat exchange and so on.
2.Environmental protection areas: thermal power flue gas desulfurization equipment, wastewater treatment and so on.
3.Energy field: nuclear power generation, comprehensive utilization of coal, tidal power, and so on.
4.Petrochemical Industry: oil refining, chemical equipment and so on.
5.Food areas: salt, soy sauce and so on.

In many of the above areas, 304 ordinary stainless steel is not competent, in these special areas, special stainless steel is indispensable, but also can not be replaced. In recent years, with the rapid development of the economy and the continuous improvement of the level of industrial fields, more and more projects require a higher grade of stainless steel. With the increased demand for nickel based alloy of industry, in 2011, China's nickel base alloy market scale reached 2370 million yuan, therefore, the level of development of the industry is in a steady upward trend.