2, gadgets. The length is less than 20 cm. This knife is mainly used for cutting. Common ones are fruit knives and small folding knives. Often used to cut fruit, peel, and open express delivery. The requirements for steel hardness and strength are not high, but the requirements for rust prevention are relatively high. So for this kind of knife, the most suitable steel is stainless steel. After the apple is cut, it won't rust even if you forget to clean it the next day. Rinse with water before use.
3. Large tools. This broadsword is more than 40 centimeters long, and it is mainly used violently, such as chopping wood, chopping and digging. Common ones are mountain knives, firewood knives and machetes. The biggest requirements of this kind of knife for steel are high hardness, high strength, high toughness and high wear resistance. To meet these conditions, carbon steel is preferred, such as pure carbon steel 1040, 1060, 1095. The internal structure is relatively simple, it will be extremely fierce after proper treatment, with extremely high strength and hardness, excellent cutting performance and good impact resistance. It is not only tough and durable, but also easy to polish.