A kind of wear-resistant and corrosion-resistant boron-containing high-silicon bainite alloy and its manufacturing method

Abstract

The invention relates to a boron-containing high-silicon bainite wear-resistant corrosion-resistant alloy and a manufacturing method thereof. The alloy comprises the following chemical components in percentage by weight: 0.3-0.6% of C, 1.6-2.6% of Si, 0.6-1.0% of Mn, 0.6-4.0% of Cr, 0.3-0.5% of Mo, 0.3-0.5% of Ni, 0.3-0.5% of Cu, 0.1-0.3% of Ti, 0.05-0.1% of B, 0.05-0.15% of Ce, 0.05-0.15% of Nb, less than 0.04% of P, less than 0.04% of S and the balance of Fe. The manufacturing method comprises the following steps: carrying out electric-furnace smelting, carrying out secondary aluminum insertion deoxidization, putting on the bottom of a casting ladle to form a casting, austenizing the casting at 850-950 DEG C, keeping the temperature for some time, putting in a salt bath at 200-260 DEG C to carry out primary isothermal quenching, keeping the temperature for 5-10 minutes, carrying out secondary isothermal quenching in a salt bath at 260-400 DEG C, keeping the temperature for 0.5-4 hours, and cooling in air to obtain the wear-resistant corrosion-resistant alloy of which the austenite-bainite base is distributed with boride. The alloy is low in preparation cost and suitable for marine silt erosion and corrosion environments, has favorable comprehensive properties of toughness, wear resistance and corrosion resistance, and can be used for dredger cutter teeth, slurry pipelines, centrifugal-pump impellers, blades and the like.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of steel preparation, and in particular relates to a boron-containing high-silicon bainite wear-resistant and corrosion-resistant alloy and a manufacturing method thereof. [0003] Background technique: [0004] Ocean engineering is one of the important aspects of the national strategic development of ocean affairs. With the development of ocean resources, ocean engineering platforms, large-scale ocean engineering auxiliary ships and related industries have developed rapidly. Wear-resistant materials for marine engineering is a direction of great research and development value. Wear-resistant components of construction machinery working in seawater environment, such as dredger cutter teeth, mud conveying pipes, centrifugal pump impellers, blades, etc. Shear force erosion, sediment wear and seawater erosion, corrosion and wear are quite serious, requiring sufficient strength and toughness and good wea...

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Problems solved by technology

However, its initial hardness is very low and cannot be used as a wear-resistant material, especially under low or no impact load conditions; high-chromium cast iron has excellent wear resistance and good resistance to pitting and crevice corrosion, but Its toughness is too low, and it will break due to insufficient toughness under a large impact load, and there are problems such as welding repair difficulties

Moreover, due to the addition of a large number of alloy elements, the cost of use is high; the mooring chain steel has high strength, good toughness, good cold bending performance and welding performance, and has good seawater corrosion resistance, fatigue resistance, wear resistance and other characteristics , but the preparation process of this kind of steel is complicated, suitable for large-scale production, and the preparation cost is high; low alloy steel can greatly improve strength, hardness and toughness, and improve corrosion resistance through the addition of alloying elements and microstructure control, but at present The low-alloy steel used has the disadvantages of low hardness and poor wear resistance

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