A kind of hb500 grade easy-welding wear-resistant steel with a thickness of 60-80 mm and its production method

Abstract

A kind of HB500 grade weldable wear-resistant steel with a thickness of 60~80mm, its composition and wt% are: C: 0.28~0.38%, Si: 0.01~0.10%, Mn: 1.30~1.80%, P: ≤0.005% , S: ≤0.003%, Cr: 0.85~1.15%, Mo: 0.45~0.75%, Zr: 0.05~0.12%, Ti: 0.12~0.20%, B: 0.001~0.008%, N: 0.0035~0.0045%, O : 0.0055~0.0075%; production method: heating after smelting and continuous casting; rough rolling; finish rolling; cooling to room temperature; quenching; tempering; ready for use. The invention promotes the high-temperature and refractory Ti and Zr precipitates through the addition of Ti and Zr, and the process route of rapid cooling and quenching heat treatment (DQ+RQ) after rolling, and obtains wear-resistant steel with a hardness of HB500. Rate A A≥9.0%), ‑40°C impact energy ≥47J). The single-pass welding heat cycle test and welding test show that the steel welded joint of the invention has good mechanical properties, embrittlement resistance (impact energy ≥ 27J), can meet various welding processes, and has easy welding characteristics.

Description

Technical field[0001]The present invention relates to a mechanical engineering steel and a production method thereof, belonging to an HB500 class is easily welded to wear steel and a production method.Background technique[0002]Wear-resistant steel is mainly used in bulldozers, loaders, excavators, dump trucks and various mine machinery, grab, stack assemblers, piles of piles, etc. In most cases of wear-resistant steel, it is used as a structural member, which requires a certain welding performance, especially under complex conditions conditions.[0003]HB500-level wear-resistant steel, usually used to increase carbon content and multi-alloying improvement hardness, resulting in deterioration of welding performance. Materials are in the weld process, and the all regions of the base material are different from different welded thermal cycles, resulting in non-uniform microstructure and mechanical properties of the weld heat afforestation region (HAZ). Among them, the crude crystal therm...

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Problems solved by technology

[0005] At present, the research on the heat-affected zone of coarse-grained steel welding mainly focuses on the influence of welding heat input on it. Generally speaking, the greater the welding heat input, the more serious the embrittlement phenomenon will be. When the welding performance of the material is poor Usually, the welding quality is ensured by adjusting the welding process (such as reducing the welding input, preheating before welding and heat preservation after welding, etc.), but this will seriously affect the welding efficiency, and the welding quality cannot be guaranteed. The organization does not pay attention to its impact

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