High Temperature Mechanical Properties of Martensitic Chromium Stainless Steel 9Cr18, 9Cr18Mo, 9Cr18MoV

Heat Resistant Properties of Martensitic Chromium Stainless Steel 9Cr18, 9Cr18Mo and 9Cr18MoV

Lives and work in extreme temperatures, both high and low, provide many challenges for materials and products that must function reliably within these conditions. So, it is important to understand the properties of various materials and the effects of different temperatures on them. Some materials have higher resistance to heat than others and can be used for applications which involve higher temperatures. Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, and 9Cr18MoV are three such materials, which have several heat-resistant properties that are beneficial in numerous applications.

9Cr18 is a martensitic stainless steel with 18 percent chromium and 9 percent nickel content. It is known for its corrosion resistance, toughness, and strength at room temperature, and its properties become even better at higher temperatures. The steel has excellent resistance to oxidation, which makes it suitable for use in high temperature conditions. It also has good ductility and is able to withstand loads at temperatures up to 600 degrees Celsius.

9Cr18Mo is similar to 9Cr18 with its martensitic structure and 18 percent chromium and 9 percent nickel content. However, it also contains molybdenum which has been added to enhance its corrosion resistance and wear resistance. The molybdenum also increases the level of resistance it has to oxidation. 9Cr18Mo is able to withstand temperatures of up to 800 degrees Celsius, making it one of the most heat resistant steels available.

9Cr18MoV is a martensitic stainless steel that has increased levels of chromium and molybdenum compared to 9Cr18Mo. It has 18.5 percent chromium and 9.5 percent nickel, as well as molybdenum and vanadium for better corrosion and wear resistance. The special alloying elements increase its ability to withstand heat, with resistance to temperatures of up to 900 degrees Celsius.

In conclusion, martensitic chromium stainless steels are excellent materials for use in high temperature applications. 9Cr18, 9Cr18Mo and 9Cr18MoV all have improved resistance to oxidation and wear compared to other types of steel. They also have excellent strength and ductility even at elevated temperatures. The 9Cr18MoV alloy is the highest temperature resistant of the three, however, all are suitable for applications which require extreme heat resistance.

Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV is the most widely used stainless steel material, which has good comprehensive performance, such as high strength and wear resistance. It is widely used in blades, cutters and high temperature processing fields. The high temperature mechanical properties of Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV mainly refer to its high temperature strength, high temperature toughness and thermal fatigue properties.

1. High temperature strength of Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV: It is generally believed that the strength of this type of stainless steel decreases when the temperature rises, and falls sharply at 500-600℃. When the temperature is higher than 600℃, the room temperature strength decreases rapidly, and the strength at 800℃ is only about 1/10 of the room temperature strength.

2. High temperature toughness of Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV: It is usually measured by impact test, which is higher than that of austenitic stainless steel mainly due to the quenching characteristics of its structure change. Its toughness gradually decreases with the increase of temperature. When the temperature is higher than 600-700℃, due to the embrittlement of the matrix, the impact sensitivity is significantly enhanced and the toughness is significantly reduced.

3. Thermal fatigue properties of Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV: The thermal fatigue properties of martensitic stainless steel are poor and prone to failure, mainly because the structure of martensitic stainless steel can not absorb the deformation caused by thermal stress easily.

In summary, Martensitic chromium stainless steel 9Cr18, 9Cr18Mo, 9Cr18MoV has good comprehensive performance, such as high strength and wear resistance. However, its high temperature strength, high temperature toughness and thermal fatigue properties are relatively poor, which should be taken into account when selecting materials.