Types of alloy tools.
Cemented carbide is the tungsten drill class (WC), tungsten Chin drill class (WC-TiC), tungsten Chin Tan (Ni) drill class (W-Tic-TaC) and other hard carbides sintered with Co as a binding agent material. Invented by the German company Krupp in 1926, the main body of the W-Co system. In cast iron, non-ferrous metals and non-metals in the cutting of excellent performance. 1929-1931 around, Tic and TaC and other additives such as composite carbide carbide system in the cutting of ferrous metals showed excellent performance. So. Cemented carbide has been popularized to a large extent. According to the ISO standard, mainly based on the hardness and strength of cemented carbide, cemented carbide insert materials are roughly divided into three categories: P.M, IC.

(1) K class national standard for YG class, the composition of WC + Co. Suitable for processing short cut genus of light color metal, non-ferrous metals and non-metallic materials. The main components are carbide pigeon (WC) and 3% -1091, drill (Cc), sometimes also contains a small I carbonization of Tan and other additives.
　　(2) P class national standard for YT class, the composition of WC + TiC. suitable for processing long chips of ferrous metals. The main play components are carbide drink, tungsten carbide and drill (or set). Sometimes add additives such as carbonized crude.
　　(3) M class national standards for Yw class, the composition of WC + TiC + TaC, suitable for processing long chips into short chips of ferrous and non-ferrous metals. Composition and performance between the K class and P class, can be used to process key and cast iron. The above is the general classification of cemented carbide used for general cutting tools. In addition to this, there are also ultra-micro-razor carbide. It can be regarded as belonging to K class. However, because of its sintering performance requires a higher content of Co bonding agent f, so the high a performance is poor. Mostly only used in drilling, reaming and other low-speed cutting tools.

Characteristics of each type of alloy cutter:

YG8 (K30) hardness ≥ 89.0 suitable for cast iron, non-ferrous metals and their alloys, non-metallic materials, uneven surfaces and intermittent cutting rough turning, rough planing, rough milling, general holes and deep holes drilling and expanding, reaming.

　　YG8N (K20K30) hardness ≥ 90 suitable for cast iron and non-ferrous metal roughing, also suitable for stainless steel roughing finishing.YG6X (K10) hardness ≥ 91.0 suitable for alloy cast iron. Ordinary cast iron finishing and semi-finishing.

　　YW1 (M10) hardness ≥ 91.5 for heat-resistant steel, steel, stainless steel and alloy steel and other difficult to process steel processing, but also for ordinary steel, cast iron processing.

　　YW2 (M20) hardness ≥ 90.5 for heat-resistant steel, high manganese steel, stainless steel and alloy steel and other difficult to process steel processing, but also for ordinary steel, cast iron processing.

　　YW3 (M10M20) hardness ≥ 92 for stainless steel, alloy steel, high-strength steel, ultra-high-strength steel finishing and semi-finishing. It can also be used for rough machining under the condition of small impact force.

　　YS25 (P25) hardness ≥ 90.5 for carbon steel, cast steel, high manganese steel, high strength steel and alloy steel roughing, milling and planing.

　　YS30 (P30) hardness ≥ 90.5 is suitable for milling all kinds of steel with high efficiency, especially suitable for milling and hobbing of alloy steel.

　　YS8 (M05) hardness ≥ 92.5 for iron-based, nickel-based high-temperature alloys, high-strength steel finishing, cold cast iron, heat-resistant stainless steel, high manganese steel, hardened steel finishing.

　　YD05 (K01) hardness ≥ 93 dedicated to processing a variety of nickel-based, cobalt-based, iron-based and tungsten carbide-containing self-soluble spray alloy materials.

　　YD15 (K10K20) hardness ≥ 91.0 suitable for fine turning, office fine turning titanium alloys, nickel-based high-temperature alloys, but also suitable for processing various types of castings.

　　YD101 is suitable for finishing and semi-finishing of cast iron, non-ferrous metals, especially aluminum, and processing of manganese steel, hardened steel and other hard materials.

　　YT726 Hardness ≥93 High red hardness, good wear resistance. It is suitable for turning and milling of cold cast iron and hardened steel.

　　YT798 Hardness ≥ 92.2 Good toughness, high resistance to thermal shock cracking and plastic deformation. Suitable for milling alloy structural steel, alloy tool steel, also suitable for high manganese steel, stainless steel processing.