Components of high-toughness ultrahigh-strength steel and preparation process of high-toughness ultrahigh-strength steel

Abstract

The invention relates to components of high-toughness ultrahigh-strength steel and a preparation process of the high-toughness ultrahigh-strength steel, and belongs to the technical field of alloy steel. The high-toughness ultrahigh-strength steel comprises the components in percentage by mass: 0.25-0.45 percent of C, 0.4-1.2 percent of Si, 0.3-1.5 percent of Mn, 2.0-3.5 percent of Cr, 2.5-4.0 percent of Ni, 2.0-4.5 percent of W, 0.4-0.8 percent of Mo, 0.1-0.4 percent of V, less than or equal to 0.005 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.0015 percent of N, less than or equal to 0.05 percent of Cu, and the balance of Fe. A preparation process of the high-toughness ultrahigh-strength steel comprises a smelting process, a forging process and a heat treatment process. According to the high-toughness ultrahigh-strength steel, the use cost is greatly reduced, the mechanical property meets the national standard requirement and the steel has an important popularization and application value.

Description

technical field [0001] The invention relates to a composition of high-toughness ultra-high-strength steel and a preparation process thereof, belonging to the technical field of alloy steel. Background technique [0002] The main characteristics of ultra-high-strength steel are high strength and certain toughness. It is mainly used to manufacture important components that withstand high stress and large impact loads and require high fatigue performance. It has a wide range of applications in civil and military applications, such as high-pressure vessels, hydraulic and mechanical press components, key vehicle components, bridge structural frames, high-strength bolts, cold extrusion and cold stamping dies, aircraft girders and landing gear, aero-engine shafts , rocket engine casing, deep penetrating projectile, firearm parts, armor plate, etc. However, with the development of application technology and the emphasis on economic affordability, ultra-high-strength steels are requ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that a large amount of Co and Ni high-cost materials must be used in order to improve the toughness and plasticity when processing traditional ultra-high-strength steel, and to provide a high-toughness ultra-high-strength steel and its preparation process, which has both ultra-high strength and ultra-high strength. High strength and toughness combined with relatively low manufacturing costs

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