Matrix high speed steels

The concept of the matrix steel
Is the matrix steel components and high-speed steel matrix after quenching similar composition, and improved performance of a class of steel, reducing the matrix eutectic carbide steel, and its uniform distribution, process performance, significantly improved strength and toughness Generally speaking, high-speed steel matrix in the composition a small amount of other elements, appropriate changes in the carbon content in order to meet certain requirements to improve the performance of steel, also called the base steel.
Matrix steel by high-speed steel substrate derived new steel, the quenched matrix with high-speed steel hardening matrix are similar, but not high-speed steel in so many eutectic carbide (basically no eutectic carbide exists) . Such matrix in the steel alloying elements appropriate adjustments to meet the different needs, after the adjusted base steel referred to as modified base steel or high speed steel substrate steel, also called the matrix high speed steel, foreign as matrix high speed steel or model of high speed steel, industrial application of alloying elements are adjusted by modified base steel.

Characteristics of the Matrix steel
Although high-speed steel with high strength, hardness, red hardness and wear resistance, but there is too much organization and poor uniformity of excess carbon, leads to brittle, and this is kind of steel ledeburite common weaknesses. Although low-alloy tool steel with higher toughness and ductility, but the strength, red hardness and wear resistance and high-speed steel are not. Therefore, the development of both the advantages of high speed steel, and both the advantages of low-alloy tool steel, new steel, is the country of the widespread attention of the research projects. Steel substrate with such properties belong to the steel.
Matrix containing the volume fraction of steel that allows for 5% of the residual carbides can increase wear resistance, on the other hand helps prevent grain growth when heated to high temperatures. This matrix of steel, hardened high-speed steel substrate and the mother has some fundamental differences, the performance of the matrix will also appear significantly different. To make up for lack of intensity, the simplest way is the mother of high speed steel matrix composition appropriate increase in carbon content, or a combination of a process needs, or whether the source taking into account the wide range of alloys, the price is low and other factors, appropriate to add Shaoliang alloying elements, such as titanium, nickel, silicon, manganese, aluminum, niobium, etc. to be modified to form the market now the matrix of steel series of new steel grades.

Grades of steel steel substrate
Matrix made mostly of steel W6Mo5Cr4V2 high speed steel for the mother to be modified in various ways, producing a matrix of various grades of steel. At present, have been included in GB / T 1299-2000 standard, the matrix alloy steel, tool steel class has two grades, namely, 65Nb (6Cr4W3Mo2VNb) and 6W6Mo5Cr4V. Pilot phase is being developed matrix of steel with steel type: LD (7Cr7Mo2V2Si), 012Al (5Cr4Mo3SiMnVAl), CG-2 (6Cr4Mo3Ni2WV), 5Cr4Mo2W2SiV, RM2 (5Cr4W5Mo2V), LM1 (65W8Cr4VTi), LM2 (65Cr5Mo3W2VSiTi) and so on. Matrix of foreign steel grades are: EXT161 (50Cr4Mo4W2V), EXT158 (50Cr4Mo4W2VCo5), MACVMn (50Cr4Mo3W2V), Matrix Ⅱ CVM (55Cr4Mo5WVCo8), YXR3, YXR7, YXR33, DRM1, DRM2, DRM3 and so on.