High carbon high-speed steel of containing granular carbide, and preparation method

Abstract

This invention discloses a method for preparing particular carbide-texile high-carbon high-speed steel, which is composed of: C 1.5-3.0 wt.%, V 3.0-6.0 wt.%, W 4.0-8.0 wt.%, Mo 2.0-6.0 wt.%, Cr 4.0-8.0 wt.%, Nb 0-5.0 wt.%, Co 0-5.0 wt.%, RE 0.05-0.20 wt.%, Ti 0.1-0.3 wt.%, N 0.06-0.18 wt.%, Zn 0.01-0.05 wt.%, Mg 0.02-0.12 wt.%, Ni 0-1.0 wt.%, Si 0-2.0 wt.%, Mn 0-2.0 wt.%, P 0-0.05 wt.%, S 0-0.05 wt.% and Fe, wherein the total content of Nb and Co is within 2.5-5.0 wt.%. The method comprises: casting in an electric furnace, heating at 1020-110 deg.C for 2-4 h, air-cooling, normalizing, heating at 500-580 deg.C for 4-8 h, and air-cooling or furnace-cooling to room temperature to obtain martensite-based particular carbide-texile high-carbon high-speed steel. The steel has improved mechanical properties with tensile strength of 930-980 MPa, impact toughness of 12-15 J/cm2 and fracture toughness of 48-55 MPa, improved thermal fatigue resistance and excellent wear resistance.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and relates to the preparation of high-carbon high-speed steel, in particular to a high-carbon high-speed steel containing granular carbides and a preparation method thereof. Background technique [0002] The roll is a key spare part in steel rolling production. Its quality not only affects the production rate of the rolling mill, but also affects the surface quality of the rolled material. Improving and improving the quality of the roll is an important issue that the roll research, production and use departments continue to work hard and strive to solve. At present, high-carbon high-speed steel roll materials have been successfully developed at home and abroad. Because this material contains more alloying elements such as tungsten, molybdenum, chromium, vanadium and higher carbon content, the metallographic structure contains more Carbide with good we...

AI Technical Summary

Problems solved by technology

However, simply adding rare earth, titanium, and boron elements to aluminum-containing high-carbon high-speed steel cannot obtain granular carbides. In order to refine the structure and improve the morphology and distribution of carbides, this high-speed steel needs to be forged or rolled. , complex process

Chinese invention patent CN1718315 also discloses a preparation method and equipment for high-speed steel billet, which is characterized in that the method includes the following steps: Step 1, pouring the molten high-speed steel melt qualified for smelting into a tundish with temperature adjustment function Adjust the temperature so that the temperature of the high-speed steel melt is kept between 1 and 5°C higher than the liquidus temperature; step 2, the high-speed steel melt whose temperature has been stabilized at 1-5°C higher than the liquidus is continuously Pour into the preheated pre-crystallizer, cool continuously at a rate of 1-15°C / min, and at the same time apply a stirring or vibrating force field to the high-speed steel melt for 0.5-5 minutes to form a solid containing 10-60% solid phase liquid mixture, the preheating temperature of the pre-crystallizer is between 80°C below the solidus of the alloy and 5°C below the solidus of the alloy; step 3, the solid-liquid mixture formed above containing 10% to 60% of the solid phase is passed through the preheating The lower port of the crystallizer directly enters the inner cavity of the final crystallizer, and is cooled and solidified at a speed of more than 80°C / s on the surface, and then the final crystallizer is continuously pulled out by the billet drawing mechanism to obtain high-speed steel billets. The high-speed steel billet has excellent microstructure and performance, but the process and equipment are complex and the production efficiency is low

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