The history of the blade is fantastic. It is the tools for human life, used to do the housework, even it is the best weapon for soldiers in the war so many years ago. So many years went by, it becomes more and more important in daily life. In the industry, the processing and production need it to finish the job to make the products. And it has so many branches due to the different applications.
The steel is good material for the blade. But different steel types will cause different impacts for blades. Let's check out what 4140 steel really is then think about its effect on blades.
What is 4140 steel?
AISI
4140 steel is one of the alloy steel. It is very popular in the industry as one of alloy steel. It has high strength, toughness and hardenability. The properties of 4140 steel and 4340 steel are similar, but the carbon element of 4140 steel is higher. Because of that, the properties of welding for 4130 steel is better than 4140 steel. This type of alloy steel, must do the processing of heat treatment to explode its mechanical property. Do not use it directly. If not, the steel will crack. In China, people usually call it as 42Crmo steel. The properties of them are similar, there is a little difference in the use.
What is best choice for blade?
Due to the properties and chemical composition of 4140 steel, it is not good for the blade. Its requirements for steel properties are really strict. 4140 steel hardness, toughness, wear-resistance are not catching the requirement. The high-speed steel is more good for it. Such as the M2 steel.
