Közönséges anyagok marókhoz
Közönséges anyagok marókhoz 1) High-speed tool steel (referred to as high-speed steel, front steel, etc.), divided into general-purpose and special-purpose high-speed steel. It has the following characteristics: a. The content of alloy elements tungsten, chromium, molybdenum and vanadium is relatively high, and the quenching hardness can reach HRC62-70. At a high temperature of…