一,前言钙硫易切钢是德国六十年代研制的,日本买了专利之后,经过两年时间,在1967年转而向外国卖出钙硫系,钙铅系等多元易切钢专利,1968年大量向国际市场供货。我国本着少花钱多办事的原则,尽量减少外汇开支,能自己解决的尽量开发利用我国自己的资源。 First, the foreword Calcium Sulfur free cutting steel is developed in Germany sixties, Japan bought a patent, after two years, in 1967 turned to foreign countries to sell calcium sulfur system, calcium and lead system and other multiple free-cutting steel patents, In 1968 a large number of international suppliers. In line with the principle of less money and more service, our country should try its best to reduce foreign exchange expenditures and try to develop and utilize its own resources as far as possible.