Both high-cobalt drill bits and cobalt-containing drill bits are high-speed steel drill bits. In fact, the raw material for cobalt-containing drill bits is high-speed steel, but not all high-speed steel can be called cobalt-containing drill bits. The grades of this high-speed steel material are M35 high-speed steel and M42 high-speed steel. Why is there the name of the cobalt-containing drill bit?
That's because the two high-speed steels, M35 and M42, have cobalt properties in their materials. M35 has a cobalt content of 5%, and M42 has a cobalt content of 8%. Cobalt is used to produce heat-resistant alloys, hard alloys, and anticorrosive alloys. , An important raw material for magnetic alloys and various cobalt salts.
Cobalt-containing drill bits are drill bits that contain the chemical element cobalt Co. Generally, cobalt is added to the raw material of high-speed steel. The purpose of adding cobalt is to improve the high temperature resistance and abrasive resistance of the drill bit, so that the drilling can achieve the purpose. In practice, it is generally used to process stainless steel, copper, and aluminum products. These products have high strength characteristics, that is, poor plasticity. During the drilling process of these materials, the discharged cuttings are attached to the drill bit. In order to solve this problem, later generations invented the cobalt-containing drill bit. When the ordinary drill bit encounters high temperature, it expands rapidly, and the continuous torsion force applied by the drill shank causes the drill bit itself. Broken, or the drill tip can not be used with flanging; in a word, a cobalt-containing drill is a high-speed steel drill bit that is added with the chemical element cobalt, which is used to cut high-grinding and easily produce high-temperature metals.
Because the level of cobalt content determines the performance of the material, in some occasions the M35 bit is called the cobalt-containing bit, and the M42 bit is called the high-cobalt bit.
The hardness of M35 drill bit is usually HRC65-67, and the hardness of M42 drill bit is usually HRC67-70. The price of M35 material is lower than that of M42. These two high-speed steels have higher durability and lower toughness than general-purpose HSS high-speed steels 6542 or 9341 (hardness 63~66HRC).
The drill bits made of M35 and M42 materials are called cobalt-containing drill bits. Because of their high hardness, good toughness, and reasonable price, they are used as special stainless steel drill bits in the machining industry. Choose a drill bit between the two. When conditions permit, the M42 drill bit is preferred. Changzhou Yinhua Tools Co., Ltd. has 18 years of experience in the production of cobalt-containing drill bits (M35 drill bits and M42 drill bits). The company has a complete quality management system and after-sales service guarantee. Actively and enthusiastically solve all kinds of drilling problems for you.
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