Easy cut by flame abrasion-resistant steel in high rigidity, in toughness and preparation method

Abstract

A high-hardness and-toughness antiwear steel plate easy to be cut by flame proportionally contains Fe, C, Si, Mn, Nb, Ti, B, Cr and additive element chosen from Ni, Mo, 'Al, Cu, V, Ca, REM and Mg. Its preparing process includes rolling and quenching from the temp not lower than Ar3 conversion point to the temp lower than M2 conversion point. It has better weldability.

Description

Technical field: [0001] The invention relates to metal plates, and in particular provides a wear-resistant steel plate with hardness HB≥320, impact toughness Akv-40°C≥30J, easy flame cutting and good welding performance in winter and its preparation technology. Background technique: [0002] Wear-resistant steel plates are widely used in loader blades in construction machinery, buckets in excavators, arc plates in bulldozers, bottom plates in dump trucks, and scraper conveyors in coal mining machinery, etc., with huge consumption. At present, there are two ways to manufacture wear-resistant steel plates: [0003] The first method uses low-carbon and low-alloy chemical composition combination, and is manufactured by off-line quenching and tempering after rolling. [0004] Its chemical composition is shown in Table 1: [0005] C Si mn P S Cr Mo Ti B 0.16～ 0.21 0.20～ 0.50 1.0～ 1.5 ≤...

AI Technical Summary

Problems solved by technology

[0041] In short, although the current domestic wear-resistant steel plate has high strength, its impact toughness is low, and due to the high cutting carbon equivalent, it is easy to produce serious damage during normal flame cutting operation under low ambient temperature. Delayed cracking on the cut surface