Ruitai Kitchen Knives: Your Premier Source for Custom Kitchen Knives Set from China
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Ruitai Kitchen Knives: Your Premier Source for Custom Kitchen Knives Set from China
As we all know, the harder and more brittle steel materials are, the easier they are to break, but the softer materials are easily deformed and twisted. Quenching will increase the overall hardness of the blade, but it also brings the risk of breaking the blade. The burning blade covered with soil craft can solve this problem well.
Several raw materials are required for the process of the burning blade covered with soil craft. The soil formula: clay + borax + iron powder + carbon powder (the ratio is 1:1), plus charcoal with the same carbon powder content.
Iron powder is recommended to use rusty iron, which can be ground down with a grinder, and then sucked with a magnet; soil is used for raw soil; borax is a sodium borate sand and mudstone powder, and its function is to remove surface oxides and make The clay adheres more closely to the blade body, which prevents it from falling off during quenching, and also prevents decarburization of the steel surface during quenching.
Burning blade with soil covering is a kind of local heat treatment method, like modern local quenching. The local tempering process is similar to burning blade with covering soil. The so-called "burning blade with covering soil" is to make a knife shape before quenching and needs to be coarsed grinding. Cover the parts of the blade where the blade does not need high hardness with the prepared soil, then heat the blade to a certain temperature, and then put the blade in the water. Areas that don't need to be covered with soil will cool quickly to achieve a hard effect. The temperature changes slowly in places covered by soil, so the hardness will be different from that of uncovered parts. So as to achieve the effect of both rigidity and flexibility, the good toughness of the blade can still be maintained under the condition of high blade hardness.
Next is cold forging, trimming slight deformation, and checking whether the quenching fails and whether there are defects. Clip steel blades don't need to be covered with soil, and the whole tool can be put into the water after it is red. Full steel needs to be covered with soil. Burning the blade to change the hardness is useful for steel, but not for iron, so there is no good knifemaker to make all-iron burnt blade knives.
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