Low-carbon sulphur free-cutting steel
A free-cutting steel and carbon-sulfur technology, applied in the field of low-carbon sulfur free-cutting steel, can solve the problem that the machined surface roughness may not be sufficient, and achieve the effect of small machined surface roughness, excellent hot workability and excellent surface properties
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[0054] First, the chemical composition of the low-carbon sulfur free-cutting steel of the present invention and the reason for its limitation will be described. In addition, in the following description, "%" of content of each element shows "mass %".
[0055] In the low-carbon sulfur free-cutting steel of the present invention, in the finish turning process, the most required point is to maintain a small machined surface roughness under the same tool during a long period of machining, and it is necessary to suppress the tool for this reason. Grooved wear on front end.
[0056] C: More than 0.02% and less than 0.20%
[0057] C is an element that has a great influence on machinability and strength. In finish turning using superhard tools, in order to reduce the roughness of the machined surface, the content of C must be kept below 0.20%. This is because when the C content is 0.20% or more, the hardness of the steel becomes high, and the groove-shaped wear at the tip of the to...
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