18Ni300 martensitic age-hardening steel is a high-performance stainless steel material. Its chemical composition contains a high proportion of nickel (Ni) and chromium (Cr), which endows it with excellent corrosion resistance and high-temperature performance. Compared with traditional stainless steel, 18Ni300 martensitic age-hardening steel has higher strength and better ductility. Its microstructure is martensitic structure, and this organizational characteristic enables it to maintain stable performance even in high-temperature and high-pressure environments.

Seamless pipes refer to steel pipes without welds, which have higher strength and better sealing performance. The combination of 18Ni300 martensitic age-hardening steel seamless tubes enables them to perform outstandingly in high-pressure, high-temperature and highly corrosive environments, and they are widely used in energy, chemical, aerospace and other fields.

Chemical composition（%）

Physical properties of 18Ni300 martensitic age-hardening steel

The reason why 18Ni300 martensitic age-hardening steel seamless pipe is highly favored is closely related to its excellent physical properties. The following are its main physical characteristics:

High strength and fatigue resistance

The yield strength and tensile strength of 18Ni300 martensitic age-hardening steel seamless pipe are much higher than those of ordinary stainless steel. Its high strength characteristic enables it to perform stably when subjected to pressure and load. This material also has excellent fatigue resistance and can be used for a long time in an environment of repeated loading without fatigue fracture.

(2) High-temperature stability

18Ni300 martensitic age-hardening steel can still maintain its excellent mechanical properties in high-temperature environments. Within the temperature range below 600℃, its strength and corrosion resistance remain stable, making it suitable for high-temperature steam pipelines, heat exchangers and other fields.

(3) Corrosion resistance

The 18Ni300 martensitic age-hardening steel seamless pipe has excellent corrosion resistance, especially in damp or corrosive media. Its high chromium and nickel content can effectively resist the erosion of various acidic and alkaline media, making it suitable for fields such as chemical equipment and Marine engineering.

(4) Good processing performance

Although the strength of 18Ni300 martensitic age-hardening steel is relatively high, its processing performance remains good. This material can be formed through cold bending, stretching and other methods to meet the requirements of different shapes and sizes.