00Cr25Ni7Mo4N mechanical properties

Introduction

Inconel 725 is a nickel-base super-alloy, which is developed to resist elevated temperature stress-rupture, oxidation and carburization. It exhibits excellent tensile and fatigue properties. Inconel 725 is primarily composed of nickel, chromium and molybdenum, in ratio of 25, 25 and 7.4 respectively. The material generally exhibits excellent mechanical strength and creep resistance at high temperature (up to 1000°F), oxidation and carburization resistance and pitting corrosion resistance in a broad range of media.

Mechanical Properties

Inconel 725 offers very good mechanical properties, including tensile strength (725-827 MPa), yield strength (572- 725 MPa), elongation (30-40%), and hardness up to 207-230 HV. The alloy is resistant to stress corrosion cracking, possesses good weldability and exhibits very good fatigue strength and ductility. Generally, its residual strength after long time exposure to high temperature is higher than other Inconel alloys.

The ultimate tensile strength of Inconel 725 is 725-827 MPa. The yield strength is 572-725 MPa. The elongation of the alloy at break is about 30-40%. The alloy has a modulus of elasticity of 189 GPa. The hardness of the material is 207-230 HV.

Heat Treatment

Inconel 725 is generally heat treated to achieve strength and other properties. The material is heat treated at 982-1066°C (1800-1955°F) for 8 hours. It is then cooled either in air or in oil. The solution heat treated material can be quenched in a solution of approx. 0.8 wt. % sodium hydroxide and then aged at 538-565°C (1000-1050°F).

Applications

Inconel 725 is widely used in a variety of industrial components, such as gas turbine blades. Due to its creep and oxidation resistance, it is often used in structural and pressure containing components in marine environments. It is also used for applications that require high mechanical strength, such as fasteners and bolts, in aircraft and aerospace structures.

Conclusion

Inconel 725 is a nickel-base superalloy that offers excellent tensile and fatigue properties, creep and oxidation resistance and pitting corrosion resistance in a broad range of media. The material is primarily composed of nickel, chromium and molybdenum, in ratio of 25, 25 and 7.4 respectively. It can be heat treated to achieve strength and other properties and is widely used in a variety of industrial components, such as gas turbine blades, fasteners and bolts, in aircraft and aerospace structures.

Stainless steel TP347H is a high carbon version of the chromium-nickel alloy steel known as Type 347. The stainless steel TP347H is a subordinate version of the standard stainless steel type 347; it has been lowed the carbon content to decrease the precipitation of chromium carbides at the grain boundary in tempers above 400 C.

The mechanical properties of the stainless steel TP347H at the global ambient temperatures, the austenize temperature of the steel is 870-880°C, the mechanical properties of stainless steel TP347H are described in the following table.

Tensile strength (MPa)≥ 635

Yield strength (MPa): 315

Elongation % 20-50

Impact energy (KV/ J): +20° С (50J)

It is important to note that the overall mechanical properties of this steel are significantly affected by the solid solution heat treatment process. It is recommended that thermal treatments such as high-pressure gas quenching, annealing and tempering should be carried out in order to achieve the desired mechanical properties.

The stainless steel TP347H has good corrosion resistance and its corrosion resistance is determined by the concentration of chromium, nickel and molybdenum contents. The stainless steel TP347H is primarily used in corrosion-resistant applications in the chemical, food processing, and oil and gas production industries, as well as in industrial processing equipment. In addition, it can also be used in a variety of other applications due to its high strength and excellent fracture toughness.

Finally, stainless steel TP347H is highly resistant to creep and fatigue crack growth, making it an ideal material for long-term applications designed under cyclic loading conditions. This material is also widely used in turbine blades and other high temperature service components.