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2023

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Common classification of cemented carbide

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Hard alloy, also known as metal hard compound alloy material, is an alloy material made from hard compound of refractory metal and bonded metal through powder metallurgy process. There are many kinds of cemented carbide, which are suitable for various working conditions such as cutting, wear resistance and impact resistance. Therefore, it is widely used in daily production. Next, Cheng Cheng will take you to see the introduction of different kinds of cemented carbide.
Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which are basically unchanged even at 500 ℃, and still have a high hardness at 1000 ℃. There are mainly three types of cemented carbide for cutting tools, cemented carbide for geological and mining tools and cemented carbide for wear-resistant parts.
1、 Carbides for cutting tools:
Cemented carbide for cutting tools can be divided into six categories according to different fields of use: P, M, K, N, S, H;
Class P: alloy/coating alloy based on TiC and WC, with Co (Ni+Mo, Ni+Co) as the binder, which is often used for the processing of long chip materials, such as steel, cast steel, long cutting malleable iron, etc; Taking P10 as an example, the suitable processing conditions are turning, profiling turning, thread turning and milling under the conditions of high cutting speed, medium and small chip sections;
Class M: alloy/coating alloy based on WC, with Co as the binder and a small amount of TiC added, commonly used for processing of stainless steel, cast steel, manganese steel, malleable cast iron, alloy steel, alloy cast iron, etc; Taking M01 as an example, it is suitable for finishing turning and boring under the conditions of high cutting speed, small load and no vibration.
Class K: alloy/coating alloy based on WC, with Co as the binder and a small amount of TaC and NbC added. It is often used for processing of short chip materials, such as cast iron, chilled cast iron, short chip malleable iron, gray cast iron, etc;
Class N: alloy/coating alloy with WC as the base, Co as the binder, and a small amount of TaC, NbC or CrC added. It is often used for the processing of non-ferrous and non-metallic materials, such as aluminum, magnesium, plastic, wood, etc;
Class S: alloy/coating alloy based on WC, with Co as binder and a small amount of TaC, NbC or TiC added. It is generally used for the processing of heat-resistant and high-quality alloy materials, such as heat-resistant steel, various alloy materials containing nickel, cobalt and titanium;
Class H: alloy/coating alloy based on WC, with Co as the binder and a small amount of TaC, NbC or TiC added. It is often used for hard cutting of bride price, such as hardened steel, chilled cast iron and other materials;
2、 Cemented carbide for geological and mining tools:
Cemented carbide for geological and mining tools can be divided into the following categories according to different parts of use:
A: Cemented carbide for rock drilling bits; Operating conditions, such as GA05, are suitable for soft rock or medium-hard rock with uniaxial compressive strength less than 60MPa, and GA50/GA60 are suitable for hard rock or extremely hard rock with uniaxial compressive strength greater than 200MPa; With the increase of brand number, wear resistance decreases and toughness increases.
B: Cemented carbide for geological exploration;
C: Cemented carbide for coal mining;
D: Cemented carbide for mining and oilfield bits;
E: Cemented carbide for composite substrate;
F: Hard alloy for snow shoveling;
W: Cemented carbide for digging teeth;
Z: Other categories;
The Rockwell hardness of this kind of alloy can reach HRA85 and above, and the bending strength is generally above 1800MPa.
3、 Hard alloy for wear-resistant parts
Wear-resistant parts are divided into:
S: Carbides for drawing metal wires, rods and tubes, such as drawing dies, sealing rings, etc.
T: Cemented carbide for stamping die, such as fastener stamping, steel ball stamping die, etc.
Q: Cemented carbide for high temperature and high pressure components, such as anvil and pressure cylinder for synthetic diamond.
5: Cemented carbide is used for the roll ring of wire rod rolling, such as the roll ring of high-speed wire rod rolling finishing mill.
The basic chemical composition and mechanical properties of different wear-resistant cemented carbide are shown in the following table:

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