Sulfur free-cutting steel

Japanese: 硫黄快削鋼 - いおうかいさくこう
Sulfur free-cutting steel
A representative type of free-cutting steel. Sulfur (0.08-0.35%) and manganese are added to steel to improve machinability. It was put into practical use in the United States in 1920. The inclusion of sulfur makes steel brittle, but it also makes cutting easier and improves work efficiency. It is said that the use of sulfur free-cutting steel is very effective when using high-speed automatic lathes, etc.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
快削鋼の代表品種。鋼の中に硫黄 (0.08~0.35%) とマンガンを添加し,被削性を向上させたもの。 1920年アメリカで実用化された。硫黄を含有すると鋼はもろくなるが,切削加工が容易となり,作業能率は向上する。高速自動旋盤などを使用する際に硫黄快削鋼を用いると効果は大きいとされる。

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