HB500-grade easy-to-weld anti-abrasion steel 60-80 mm thick and production method thereof

Abstract

HB500-grade easy-to-weld anti-abrasion steel 60-80 mm thick comprises the components of 0.28-0.38 wt% of C, 0.01-0.10 wt% of Si, 1.30-1.80 wt% of Mn, 0-0.005 wt% of P, 0-0.003 wt% of S, 0.85-1.15 wt%of Cr, 0.45-0.75 wt% of Mo, 0.05-0.12 wt% of Zr, 0.12-0.20 wt% of Ti, 0.001-0.008 wt% of B, 0.0035-0.0045 wt% of N, and 0.0055-0.0075 wt% of O. A production method comprises the steps that after the steel is smelted and subjected to continuous casting to form a blank, the blank is heated; rough rolling is conducted; precision rolling is conducted; the blank is cooled to the indoor temperature; tempering is conducted; and the blank is put aside. Through adding of Ti and Zr as well as the post-rolling quick cooling and quenching heat treatment (DQ+RQ) process route, precipitation of high-temperature refractory phases of Ti and Zr is facilitated, the anti-abrasion steel with the hardness being HB500 is obtained, in addition, the elongation A is larger than or equal to 9.0%, and the -40 DEG Cimpact power is larger than or equal to 47 J. Through a single-pass welding heat cycle test and a welding test, a steel welded joint made of the anti-abrasion steel is good in mechanical property andembrittlement resistance (the impact power is larger than or equal to 27 J), the requirements of multiple welding processes can be met, and the easy-to-weld characteristic is achieved.

Description

technical field [0001] The invention relates to a steel for mechanical engineering and a production method thereof, belonging to HB500 grade easy-to-weld wear-resistant steel and a production method thereof. Background technique [0002] Wear-resistant steel is mainly used in bulldozers, loaders, excavators, dump trucks and various mining machinery, grab buckets, stacker-reclaimers, feeding bending structures, etc. Wear-resistant steel is mostly used as a structural part, which needs to have certain welding performance, especially under complex working conditions, which requires higher welding performance. [0003] HB500 grade wear-resistant steel usually uses increased carbon content and multi-element alloying to increase hardness, resulting in poor welding performance. During the welding process of the material, each area of ​​the base metal is subjected to different welding heat cycles, resulting in uneven microstructure and mechanical properties of the welding heat-affe...

AI Technical Summary

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

Images