What drills are used in tapping 304 stainless steel?
Now on the market is generally a bit alloy steel material whole bit, although the materials are the same, but due to the processing technology, various brands of product quality disparity. Imported and domestic alloy drills are also very different. Imported alloy bit usually adopts VHM micro grain hard alloy (ISO K40), the type of ultrafine particles (0.6 m) in the application of high performance drill and ordinary milling machine, the hardness and toughness of the ideal together. Take high quality alloy bit surface coating, such as chromium aluminum nitride (AlCrN) coating, the coating layer of coating, the thickness of 4 m, the micro hardness is up to 3200HV, the friction coefficient of 0.35, thermal stability up to 1100 degrees celsius. After coating, the drill color is bluish gray. After coating, the alloy drill can process low alloy steel and high strength steel. High steel can reach 54HRC.
Alloy bit generally refers to the hard alloy bit, divided into integral, welded, indexable inserts and removable head. The main components of cemented carbide are tungsten carbide, cobalt, etc., the hardness is relatively high, generally above HRC90 degrees, and it is suitable for batch processing and hard processing.
Asked to sell drill bit, stainless steel drill bit, usually they know. Our company uses cobalt cobalt bit. It's very durable and works wellIf there's anything better, I don't know.
