Fastener steel with high strength

Abstract

The invention relates to fastener steel with the good strength, good low-temperature toughness, good hardenability, the high cost performance and the good fatigue performance. According to the fastener steel, the problem that the requirements for the steel type under special conditions in real production cannot be met due to the fact that when existing the steel is large in diameter, the strength,the low-temperature toughness and the hardenability cannot meet the requirements, the cost performance is poor and the cost is high can be effectively solved. The fastener steel is composed of the following components, by weight, 0.38-0.45% of C, 0.22-0.48% of Si, 0.81-1.48% of Mn, less than or equal to 0.018% of P, less than or equal to 0.010% of S, larger than or equal to 0.10% of V, 0.0009-0.0024% of B, less than or equal to 0.0015% of O, and the balance Fe. The fastener steel has the advantages of being scientific and reasonable in component and easy to produce; low-temperature impact absorption energy Kv of 10.9 grade fastener at the temperature of 20 DEG C below zero is not less than 27J, the low-temperature impact absorption energy Kv at the temperature of 40 DEG C below zero is not less than the requirement of 27J, especially when the diameter is large, the requirements of use of new standards and special users can be met, only highest level experts, professors, even academician post-graduates in the country can be met, and the austenite continuous cooling curve of the steel is tested, so that the unexpected effects of remarkable technology, economic and social benefits are achieved.

Description

technical field [0001] The invention relates to an alloy steel in the field of metallurgy, in particular to a high-strength fastener steel with good strength, low-temperature toughness, hardenability, cost performance and fatigue resistance. Background technique [0002] High-strength fasteners are an important basic component with a large amount of use and a wide range of applications. Not only in industries such as machinery, automobiles, and trains, but also in roads, railways, bridges, and building infrastructure projects. With the development of high-quality products in my country and the world, not only the strength requirements for high-strength fasteners have been increased, but also unprecedented new requirements for low-temperature impact toughness. In line with this requirement, corresponding international and domestic standards have been released one after another. In addition, the diameter requirements for high-strength fasteners continue to expand. The exist...

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Problems solved by technology

[0008] In view of the above situation, in order to overcome the defects of the existing steel technology, the purpose of the present invention is to provide a high-strength fastener steel, which can effectively solve the problem that the strength, low-temperature toughness and hardenability of the existing steel cannot meet the requirements when the diameter is large. , poor cost performance, high cost, and cannot meet the requirements for steel types under special circumstances in actual production

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