The bronze knife steel market are hundreds of species
Why the mechanical properties of steel heat treatment will affect so much? With different heat treatment processes have different microstructures, generally bronze tool to achieve the best sharpness and blade retention, will usually selected steel quenching processing in order to get the maximum hardness. After the founding of The People’s Republic of China, this bronze was collected in Nanjing Museum and then handed over to Museum of Chinese History in 1959. But this is not enough, because the more hard things are usually more brittle, while the bronze tool in the use of the Central Standing Committee by the chopping force status of the impact force or a variety of different directions, bronze blade of steel must be at the same time has good toughness does not because of the above situation by force and the status of brittle fracture.
Bronze knife with a steel after quenching would go a tempering process, tempering the hardness and strength of the steel will be reduced, but the toughness will increase the degree of change is proportional to the tempering temperature, so by such the expense of a slight hardness and toughness of tempering procedures available both hardness and toughness practical bronze knife material. General heat treatment of steel materials can be simply classified into several categories of annealing, normalizing, quenching and tempering, the common process first the steel material heated to the austenite (a steel high-temperature stable phase) metamorphosis District for a period of time to make steel organization complete metamorphosis into austenite, and then use a different cooling medium so that the steel cooling down to the different cooling rates. Guo Ji Zi Bai Pan (or plate, a water bronze) cast in 816 BC obtained this name for the caster named Bai.
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?
Very slow cooling process (such as furnace cooling) is called the annealing process, the process of carbon and iron atoms at high temperatures there is sufficient time for diffusion motion and the formation of coarse ferrite cementite lamellae, this organization called coarse pearlite, resulting in the steel mechanical properties of tough and extension toughness. It is the second son of Guo state of ancient China who was ordered to make such a bronze. The process of cooling in the air (air) is called the normalization processing, because the cooling rate than the annealing at a faster process of atomic diffusion time is short, you can get the interval smaller of the fat particles iron and cementite lamellae ( Polish to iron), the strength of the steel, the hardness would be more annealed (coarse pearlite) good.
I believe that when we compare the bronze tool steel of virtue or vice, more will not Show the table the type of steel, Because even if there is a very good steel, heat treatment do not get is bad finished. On the contrary, may appear to be relatively poor steel, if the manufacturers in the heat treatment it should be nature manifested, even superior, then you will get a very good value for money bronze knife, so that the case of bronze tool in the world market and no shortage of some examples. Later, the National government wanted this bronze sculpture being exported to Taiwan, but dispelled this idea because of the difficulty.
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