The 420j2 stainless steel is a popular choice for knife manufacturers. 420j2 stainless steel contains medium quality carbon content. It has good corrosion resistance in salt free atmospheres and in most industrial environments. It is resistant to many chemicals and household cleaners; and, it is also a more durable steel compared to the 440 grades.
What 420j2 is Used For
This steel is used in making precision surgical instruments because of its sharpness as well as it’s corrosion resistance. Surgical steel needs to be treated in a very harsh environment to sanitize it. (The best folding knife for under $50 endorsed by an Airborne soldier).
The 420j2 steel is also used for making knifes, daggers, and other instruments used in battle. This steel is often made into haircutting scissors and household scissors. The 420j2 steel is great for producing a fine and smooth polished blade.
Properties of This Steel
420j2 steel can be easily machined, so this increases it’s usefulness and demand. 420j2 has a superb hardening capability which makes it a very good all-purpose knife. The hardening process is comprised of the following steps, and these steps result is a great knife.
How it is Made
Beginning with heat treatment and sub-Critical Annealing: Heat treatment begins by uniformly heating the steel to 730 °C – 790 °C and keep the temperature there until the temperature is the same throughout the piece of steel. The next step is soaking the steel and air cooling it. Annealing involves heating the steel throughout to 840 °C – 900 °C and hold it until the temperature is the same throughout. The next step is soaking but cooling it in the furnace.
Hardening means heating it until the heat reaches to 950 °C – 1020 °C and hold there until the temperature reaches throughout the section. It is necessary to put the steel in oil or air cool. Temper immediately while still hand touch warm. Proper hardening will result in the best all-around properties of the steel. Tempering is a process that should be done carefully. Otherwise, the critical characteristics of the steel will be damaged. There are several steps that can be taken to turn the tempered steel into material that is useful for a variety of reasons. Many knives are made from this steel. It is excellent steel for making hunting knives and general purpose household knives. Some woodcarving tools are also made of this steel.