The American standard of 3Cr 13 is 420J2 stainless steel, which belongs to middle and low grade tool steel. Except for excellent antirust performance, other indicators are very general, mainly used to make kitchen knives that often encounter water, and the hardness is about HRC53.
Generally, knives are made of high carbon steel, medium carbon steel is not used, and the carbon content is relatively high. Stainless steel is also high carbon stainless steel, high chromium and high carbon.
The manufactured sword should be made of composite steel, and the materials of the blade and the blade body are different. The blade should be high carbon steel, hard and sharp, but the toughness is slightly poor. If it is used as a blade, it will be easily broken. The high-speed cutting steel used to make modern turning tools is the best, but it is a pity that it cannot be processed without special equipment and technology.
The steel for making blades should have low carbon content, pursue toughness, and be able to withstand certain deformation without breaking. Traditional swords are made by folding and forging these two kinds of steel for many times, and some even have to be folded thousands of times and hammered tens of thousands of times to achieve the ideal effect-the real "hammering"! If only the same kind of steel is used as the cutting tool, even the high-quality steel produced by modern smelting technology can not give consideration to the two properties of "hard but not brittle" at the same time! To make a good knife, even the simplest process does not need folding forging, at least two blanks should be forged directly together to make the knife body.