Steel 9hs belongs to the tool type, which is characterized by two distinctive features: high hardness and excellent qualities in terms of strength. These and other features are due to the fact that the instrumental materials have a special alloy composition, and are also made using special techniques.
Main characteristics
Metallurgical enterprises currently produce a huge number of steels of various types. The characteristics of 9xx steel have led to the fact that it also refers to the instrumental type, and the main feature is the content of chromium and silicon in the composition. The main application of this steel grade is the manufacture of items for measuring, as well as for cutting and manufacturing knives. Most commonly used for products such as dies, reamers, and combs.
High operational and mechanical characteristics have led to the fact that steel is actively used for the manufacture of elements and parts for which high demands are placed on resistance to wear, resistance to bending and elasticity.
Positive traits
Knives made of steel 9xs are made due to the fact that it has the following advantages:
- The distribution of carbides in this steel grade over the entire cross section is more uniform. This quality allows the manufacture of threading tools in increments for small threads.
- Another advantage is that the steel of this class, used for the manufacture of knives, is characterized by high resistance to cracking.
- Another feature is that in the annealed state, increased hardness of this alloy is manifested. In addition, it is quite easy to operations such as calcination and is characterized by heat resistance. The same qualities are inherent for knives from this material.
Alloy structure
The composition of 9xx steel includes many alloying elements. One of the main ones is chromium, the quantitative content of which ranges from 0.95% to 1.25%. The presence of this substance increases such a parameter as strength and hardness. In addition, chromium significantly increases corrosion resistance. Silicon, which is also present in the composition, and its content is more than 1%, have very similar properties. However, it is worth noting that due to it, ductility and viscosity are slightly reduced. However, you can significantly increase the threshold of such characteristics as cold brittleness and increase the yield strength.
Heat treatment and reviews
The heat treatment procedure for 9xx steel is carried out in electric furnaces. During this procedure, you must monitor the following:
- constantly monitor the heating temperature;
- it is necessary to control the metallographic structure of the material, magnetic permeability;
- constantly check the material for hardness.
For further alteration, this steel is usually produced in sheet form. From each other, they usually differ in sheet length and thickness.
As for the reviews, they are quite positive. Some users noted that even after the first use it became clear that the tool was made of steel with high strength. Some people said that this knife is completely perfect. It was noted that the handle of this device is very comfortable, but it looks pretty good. To achieve this effect, stabilized wood with the addition of birch bark is used. Thanks to these factors, it becomes possible to use the knife even in severe frosts and without mittens. The blades themselves for these knives are made in the classical style and are pointed towards the end. It is located down and with a slight slope, so that it is even more convenient to use.