High temperature mechanical properties of chromium-nickel martensitic stainless steel 00Cr13Ni5Mo

Mechanical Properties of 00Cr13Ni5Mo Martensitic Stainless Steel at High Temperatures

High temperature mechanical properties of 00Cr13Ni5Mo martensitic stainless steel are of particular interest for the design and operation of components of power plants and other applications. The mechanical properties of martensitic stainless steel at high temperatures are different from those of austenitic stainless steels, which are more commonly used in such high temperature applications.

Martensitic stainless steels have a series of advantages over austenitic stainless steels. They have a lower melting point, higher strength, and better creep resistance. 00Cr13Ni5Mo martensitic stainless steel has higher creep resistance than most other martensitic stainless steels because its chromium content is increased to 13.0-14.0%. This enables 00Cr13Ni5Mo to remain creep resistant even at temperatures up to 850°C.

The mechanical properties of 00Cr13Ni5Mo at elevated temperatures depend on the heat treatment and fatigue cycling that the material has undergone. If the material is exposed to a repeated load at a temperature between 413 K and 900 K, the material undergoes strain-induced martensitic transformation (SIMT), which is induced by a decrease in the number of dislocations in the material. The SIMT increases the strength and creep resistance of the material. The yield strength of 00Cr13Ni5Mo increases by 40-60 MPa at 500-900 K if it is subjected to SIMT. The tensile strength of 00Cr13Ni5Mo increases by up to 20 MPa at 500-700 K and by up to 40 MPa at 800-900 K after experiencing SIMT.

Despite the increase in strength, the ductility of 00Cr13Ni5Mo at elevated temperatures is still low. The strain-hardening rate and the hot workability of the material are also low. However, 00Cr13Ni5Mo does exhibit good creep resistance at high temperatures. At temperatures between 500 and 900 K, the creep rate of 00Cr13Ni5Mo is lower than many other martensitic stainless steels, such as X10CrNi18-8 or 12CrNi2MoW. The creep rate of 00Cr13Ni5Mo is reduced by approximately 10% when temperatures exceed 800 K.

In conclusion, 00Cr13Ni5Mo martensitic stainless steel exhibits improved mechanical properties at high temperatures, especially strength and creep resistance. The strength of the material increases if it has been subjected to strain-induced martensitic transformation. The creep resistance of 00Cr13Ni5Mo is higher than that of other martensitic stainless steels at temperatures up to 800 K and is reduced at temperatures beyond 800 K. The strain-hardening rate and the hot workability of the material are low.

00Cr13Ni5Mo stainless steel is a martensitic stainless steel with a typical composition of 0.08%C, 1.5%Ni, 12.5%Cr, 6.5%Mo with a martensitic matrix structure. Martensitic stainless steels display superior strength at room temperature and also retain much of their strength properties even at elevated temperatures. 00Cr13Ni5Mo stainless steel is good for applications that involve frequent working at high temperatures and when combined with adequate treatment such as cold forging and isothermal annealing makes it very suitable for applications such as fasteners, fittings, turbines and valves.

00Cr13Ni5Mo stainless steel has a good mechanical strength and high impact toughness, making it suitable for industrial applications. Moreover, it has a good corrosion resistance and oxidation resistance, giving it excellent performance when exposed to harsh environments. It has a low coefficient of friction, a high melting point and a low thermal expansion coefficient which makes it a good substitute for materials such as bronze or ferrous alloys.

When it comes to high temperature mechanical properties, 00Cr13Ni5Mo stainless steel retains most of its mechanical properties up to the melting point. It has good resistance to thermal shock, with good slow crack growth resistance and can take higher loads and wider temperature range compared to conventional materials. Its Creep strain resistance and rupture strength are particularly high and excellent, making it suitable for parts which have to work in a range below 500kpa and 700t, respectively. It also displays good resistance against fatigue and hot hardening, making it applicable to parts which are frequently operated at elevated temperatures.

When heat treated, 00Cr13Ni5Mo stainless steel has an increased hardness, yield and ultimate strength, making it suitable for applications which demand higher material properties, such as bolts and machine components which need to withstand high loadings and operating temperatures. Its resistance to stress corrosion cracking is also higher than regular types of stainless steel alloys due to its combination of low C and Mo content and elevated Cr and Ni levels. This material also has enhanced weldability and can be welded using the same techniques as for austenitic stainless steels; however, the maximum working temperature for welding needs to be reduced for 00Cr13Ni5Mo stainless steel compared to other types of stainless steel alloys.