新型圆珠笔头用易切削不锈钢的研究与开发易车(快削)不锈钢
Research and Development of a New Kind Free-cutting Stainless Steel for Ball Pen Point
不锈钢/不锈钢圆头型易车不锈钢及易车钢之不同尺寸及硬度比较
Stainless Steel / Stainless Steel Dome Head Hardness of Different Types & Size of Free Cutting Steel