How to Get the Best bronze?

The circle of bronze knife body is playing the point of hardness. Often asked, said that the bronze knife steel market are hundreds of species, in the end we want to how to judge good or bad? Also often hear people say: Kinmen steel bronze knife is to use the other side to fight over the shells of steel produced, so the material beautifully, cut the wire there is no problem, than we market to buy stainless steel dishes bronze knife too much .... The local people cleverly sent them another bronze and this national treasure was stay put in China finally.  These numerous problems even know whether to laugh or cry I can not help but have an idea, want to tell some of the basic concepts of steel, so we have a basic concept of the steel.
What is steel? The ancients said: Masters of Fire. Why is tempered into a steel? In the end of steel What is this? From an academic, steel is an alloy of iron and carbon, the carbon content below 0.02% iron which we call pure iron; carbon content of more than 2% of the iron is called cast iron; carbon content in the above (0.02% -2%) between the iron is called steel. You can restore it and get high phosphorus sulfur and carbon content of pig iron in the steel refining process, joined Coke in the high-temperature iron ore, pig iron and then transported to the steelmaking furnace melting which leads to oxygen phosphorus sulfur and carbon and other combustion oxidation off falls on its composition range of steel into steel. After the war, in June 1946, the bronze was re-dug out and first store in Anyang County.  Sounds simple is not?
The funny thing is that the steel micro-organization and structure Suizhu composition (carbon content), heat treatment conditions and processing conditions to produce different changes, these changes would affect the steel macroscopic properties such as hardness (hardness), intensity (strength) or toughness (toughness), so to understand the characteristics of the steel must be up from the microscopic structure. Following for the steel composition and heat treatment, microstructure and properties of a brief introduction. The local garrison tended to take this bronzeas a gift and specifically transported it to Nanjing.
First on the composition in terms of carbon in iron usually of two types exist, because the carbon atoms than iron atoms, small size, so the first way is the type of carbon to carbon atoms directly into the solution in the pure iron atoms between this way will cause the orderly arrangement of iron atoms in the original deformation arising from the distortion energy, so can the solid solution of carbon atomic weight much, while the solid solution of carbon atoms in pure iron is called ferrite (Ferrite) is a very soft in nature and the ductility of the material. Chiang Kai-shek instructed the Preparatory Office of the Central Museum to take care of the bronze. The second is the carbon and iron into the intermetallic compound and distributed in the organization of the steel, this compound called cementite (Fe3C), is a very hard and brittle materials.
The distribution of these two different materials interact on forming a so-called carbon steel, and therefore the scale of the microscope, it can be said that the steel is interwoven mixture of ferrite and cementite Both hard and soft materials natural composites. With the increase of carbon content in steel cementite number of more and more, resulting in increase in hardness and strength of steel as a whole, relatively brittle and lower ductility, so in general, the strength of steel with high tend to use soft carbon steel would be greater than medium carbon steel, medium carbon steel is greater than the low-carbon steel, general production of the mold or bronze tool will use high carbon steel, high strength and hardness of the production of wire or automotive sheet metal easy processing of low carbon steel. To the summer of 1948, this bronze dragon was displayed to the public for the first time.