Impact-smashing-resistant wear-resistant steel and preparation method thereof

Abstract

The invention discloses impact-smashing-resistant wear-resistant steel and a preparation method thereof. The impact-smashing-resistant wear-resistant steel is prepared from the following components inpercentage by mass: 0.22%-0.38% of C, 0.1%-0.3% of Si, 0.25%-1.0% of Mn, 2.1%-6.5% of Cr, 0.9%-1.8% of Mo, 0.2%-0.8% of W, 0.2%-0.8% of V, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps that proportioning is carried out; a steel ingot is smelted; the steel ingot is homogenized at high temperature; and upsetting, drawing out, annealing and quenching and tempering are carried out to obtain the impact-smashing-resistant wear-resistant steel. The impact-resistant and wear-resistant steel is excellent in impact-smashing resistance and wear resistance, the grain size is refined from the perspective of components, and stable trial production of products can be achieved by using conventional production means; and the preparation method is simple in process, is matched with a universal H13 steel heat treatment process, and has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and relates to a crushing-resistant and wear-resistant steel and a preparation method thereof. Background technique [0002] Wear-resistant steel mainly includes martensitic wear-resistant steel, martensitic ferritic wear-resistant steel and martensitic austenitic wear-resistant steel. Among them, martensitic wear-resistant steels are produced based on the contribution of the solid-solution-strengthened martensite matrix to wear resistance. They either use ferrite to improve toughness, or use retained austenite to improve toughness, and use the second phase to improve toughness. It is to relieve the brittleness caused by the work hardening of the martensitic structure. Both ferrite and austenite are ductile phases, which have an excellent effect on improving toughness. [0003] Due to the large size and specifications of wear-resistant steel for mining machinery, it is different from mass-p...

AI Technical Summary

Problems solved by technology

Its products have good low-temperature toughness and wear resistance while having high hardness, which is helpful for the manufacture of mechanical parts in harsh environments, especially at extremely low temperatures, but the martensite-ferrite duplex structure is only suitable for It is not suitable for the production of modules with a thickness of less than 100mm, and for the wear-resistant steel used for inserts, the general thickness is more than 200mm

[0008] (3) Patent CN 201110163309 proposes a martensitic wear-resistant steel and its manufacturing method. It does not use precious alloying elements such as Mo and Ni, and its mechanical properties meet national standards. Moreover, its corrosion resistance is higher than that of manganese steel. Significantly improved, the working time or wear resistance can be increased by 1 to 3 times, the performance is considerable, and the cost is low, but it does not add alloy elements that do not significantly improve wear resistance, and only relies on martensite to improve wear resistance, and solid Solvent strengthening is limited

[0009] (4) Patent CN 201710676555 proposes a steel for wear-resistant steel bars, including the following components in weight percentage: 0.55% to 0.65% of C; 0.2% to 0.4% of Si; 0.60% to 1.0% of Mn; 0.9 %~1.3% Cr; 0.15%~0.25% Mo; 0.1%~0.2% V; 0.01%~0.05% Ti; S≤0.020%; The mill has high strength, hardness, toughness and wear resistance at the site of use, basically achieving a balance of hardness, hardenability, strength and toughness, but it is medium carbon and has poor toughness, so it is not suitable for impact resistance smash environment

[0010] (5) Patent CN 201810160997 discloses a steel for wear-resistant steel bars, including the following components in weight percentage: 0.55% to 0.65% carbon; 0.2% to 0.4% silicon; 0.60% to 1.0% manganese; 0.9 %~1.3% chromium; 0.15%~0.25% molybdenum; 0.1%~0.2% vanadium; 0.01%~0.05% titanium; sulfur≤0.020%; phosphorus≤0.020%; The rod has high strength, hardness, toughness and wear resistance in the field of rod mill, basically achieving a balance of hardness, hardenability, strength and toughness, but it is based on CN 201710676555 by adding Mo and V Completed, there is still the problem of low impact toughness

[0011] (6) Patent KR 10-2016-0177123 / WO PCT / KR2017 / 014087 relates to wear-resistant steel for construction machinery, etc., and more specifically relates to a steel with a thickness of 40 to 130 (mm) having excellent wear resistance and high strength and High-hardness wear-resistant steel with impact toughness and a method for manufacturing the high-strength wear-resistant steel, although its wear resistance and impact resistance are better, but it is only suitable for the production of modules below 130mm

[0012] (7) Patent WO PCT / US2011 / 061810 / US 12 / 956,590 discloses a wear-resistant steel, although its performance is good, but due to its high nickel content, there is a greater risk of quenching cracking

Although the addition of Paralympic can improve toughness, Paralympic is easy to transform into a high-stress martensitic phase in the impact environment, resulting in local cracks, so this component is not suitable for the production of impact-resistant lifting bars

Images