Main characteristics and uses of martensitic stainless steel 44090 9Cr18

AISI 440C ( 9Cr18 ) is a kind of stainless steel, especially a martensitic stainless steel, which is heat and corrosion resistant and is used when finishing complex components. It has a high wear resistance and excellent corrosion resistance. This grade of steel has a high hardness, even at high temperatures. It is widely used in the manufacture of surgical instruments, cutting tools, knives and razors, as well as for applications such as bearings, turbine blades, automotive and aerospace components and turbines.

AISI 440C ( 9Cr18 ) is known to provide superior performance in a wide range of applications where mechanical wear resistance, corrosion resistance and heat resistance are important. Its high hardness gives it excellent wear resistance in both the dry and lubricated condition. Its corrosion resistance is comparable to grade 304 stainless steel. With proper heat treatment, it can achieve a hardness up to 60 HRC, making it ideal for use in applications requiring a high surface hardness.

AISI 440C ( 9Cr18 ) is also known to have good edge retention and is easy to sharpen. It can be used for both cutting and impact tooling, making it an excellent choice for knife blades. This steel is also well suited for applications requiring high wear resistance, such as bearing applications.

Heat treatment of AISI 440C ( 9Cr18 ) is critical to achieving the desired properties. It is most commonly heated to 955-1070°C and then cooled at a rate of 10-15°C per minute in oil. This treatment hardens the steel and gives it its desired hardness.

AISI 440C ( 9Cr18 ) is a versatile stainless steel with good hardness, wear resistance, corrosion resistance and heat resistance, making it suitable for a variety of applications. It is an ideal choice for use in surgical instruments, knives and razors, as well as for applications in the aerospace and automotive industries. Its high hardness also makes it suitable for use in bearings and other components requiring a high surface hardness. With proper heat treatment, it can achieve a hardness up to 60 HRC.

9Cr18 stainless steel, also known as 9Cr18Mo (44090), is a martensitic stainless steel produced in China. It has a carbon percentage of 0.90%, and its chromium percentage ranges from 17.0-19.0%. It is a popular grade of stainless steel due to its outstanding corrosion resistance and wear resistance.

The main characteristics of 9Cr18 stainless steel are the high wear resistance, high corrosion resistance and excellent toughness. Its application is extensive and yet versatile. It can be used in medical instruments, cutlery, precision mold components and rapidly rotating parts. It is very suitable as a bearing material. It is also used in certain knives and machining tools due to its relatively good edge stability.

9Cr18 stainless steel has excellent mechanical properties due to its hard martensitic matrix and high chromium content. It has good dimensional stability and corrosion resistance, making 9Cr18 an ideal material for machined parts. Chromium offers a good degree of corrosion resistance and hardness to form a barrier against wear.

For machining applications, 9Cr18 is a good option for parts requiring intensive operation, such as food preparation and medical instruments, but also for machining of intricate shapes, like shell-moulded connectors. Due to its excellent wear resistance and protection against corrosion, it is even used in deep sea environments.

In addition, 9Cr18 stainless steel has excellent machining, welding and forging properties. It is weldable, deformable and can be bent without ductility loss. Its forgability and formability are higher than most stainless steel grades.

To conclude, 9Cr18 stainless steel is an excellent choice for a variety of applications due to its good wear resistance, corrosion resistance, toughness and overall performance. It is highly suitable for medical instruments, cutlery, precision mold components and rapidly rotating machinery parts, as well as for machining intricate shapes. Furthermore, it is easily weldable and forgeable.