日本川崎钢铁公司开发机械结构用非调质型合金钢大直径棒材(Φ90mm～Φ190mm),其强度、韧性相当或高于经调质(淬火和回火)处理的材料。采用这种材质在加工阶段可省略调质处理,因此用户成本降低,并能改善作业环境。该公司现已开发提供样品。 机械结构用棒材的加工工序是,经切削或锻造成型后,通过调质处理增加钢的韧性并减 Japan Kawasaki Iron and Steel Company to develop non-quenched and tempered alloy steel with a large diameter bar (Φ90mm ~ Φ190mm), its strength, toughness, or higher than the quenched and tempered (quenched and tempered) materials. The use of this material in the processing phase can be omitted quenching process, thus reducing user costs, and can improve the operating environment. The company has now developed to provide samples. Mechanical structure with bar processing steps, after cutting or forging molding, quenched and tempered to increase the toughness and reduce