High temperature alloy refers to a class of metal materials based on iron, nickel and cobalt, which can work for a long time at high temperatures above 600 ° C and under certain stresses. It has excellent high temperature strength, good oxidation resistance and thermal corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties, and is also known as "super alloy", mainly used in aerospace fields and energy fields.

Metal corrosion resistant materials, relative to non-metallic corrosion resistant materials, metal corrosion resistant materials are mainly iron based alloys (corrosion resistant stainless steel); Nickel base alloy (Ni-Cr alloy, Ni-Cr-Mo alloy, Ni-Cu alloy, etc.); Active metal.

A precision alloy with abnormal thermal expansion characteristics, also known as thermal expansion alloy, widely used in the electronics industry, precision measuring tools, precision instruments and low-temperature engineering and other fields.

Elastic alloy is a kind of precision alloy, which is used to make elastic sensitive components, energy storage components and frequency components in precision instruments and meters. In addition to having good elastic properties, it also has non-magnetic, high micro-plastic deformation resistance, high hardness, low resistivity, small elastic modulus temperature coefficient, small internal friction and other properties. Elastic alloys include high elastic alloys and constant elastic alloys. The former has high elastic limit, low anelastic effect and good heat resistance. The latter in a certain temperature range of elastic modulus almost does not change with temperature, also known as (Elinvar) alloy. Elastic alloys are generally smelted in a vacuum, and semi-finished products or finished products are also heat treated in a vacuum or protective atmosphere.

Soft magnetic alloy is a kind of alloy with high permeability and low coercivity in weak magnetic field. This kind of alloy is widely used in the radio electronics industry, precision instrumentation, remote control and automatic control system, which is mainly used in energy conversion and information processing, and is an important material in the national economy.