High speed steel and productive technology thereof

Abstract

The invention discloses high speed steel and a productive technology thereof. The high speed steel comprises the following chemical components by weight percent: 1.0 to 1.4 percent of C, 3.8 to 4.2 percent of Cr, 4.8 to 5.2 percent of Mo, 6.3 to 6.5 percent of W, 8.2 to 8.4 percent of Co, 2.2 to 3.0 percent of V, 0.4 to 1.5 percent of Nb and 0.2 to 0.4 percent Si, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.4 percent of Mn, and the balance of Fe and inevitable impurities. The invention creatively introduces atomization deposition technology into the high speed steel preparation process, overcomes the defects of coarse crystalline grains and severe segregation of the traditional casted blank, abandons the disadvantages of various work procedures and high energy consumption of powder metallurgy technology, has the advantage of the powder metallurgy technology and consequently improves the various performances of metal material greatly. The advantage of the invention is obvious and outstanding.

Description

technical field [0001] The invention belongs to high-speed steel among metal materials and its production process. Background technique [0002] High-speed steel is a high-alloy steel containing a large amount of carbon (C), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V) and other elements y. It has high thermal hardness after heat treatment. When the cutting temperature is as high as 600 When the temperature is above ℃, the hardness still does not decrease significantly. The cutting speed of the tool made by it can reach more than 60 meters per minute, and its hardness is 63-65HRC. [0003] There are two manufacturing methods for high-speed steel, one is traditional ingot casting, and the other is manufacturing by powder metallurgy. Ingot casting is usually divided into two types: secondary refining (EAF+LF+VD) or electroslag remelting (ESR). In the above method, due to the slow cooling of the molten metal, the uneven segregation of the alloy and the coarseness...

AI Technical Summary

Problems solved by technology

However, the process of powder metallurgy is quite complicated, including: melting, atomization, screening, mixed batch, packaging, cold isostatic pressing, hot isostatic pressing, hot forging or hot rolling, contact packaging, heat treatment and other processes

During these processes, expensive investment in equipment such as hot isostatic pressing is required, and the size requirements of the atomization device are relatively large, and the yield of powder metallurgy materials is relatively low, and the energy utilization rate is relatively low.

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