Scraper knife blade purposed steel with Brinell hardness of 470-520 and production method thereof

Abstract

The invention relates to a loader and excvavtor scraper knife blade purposed steel with the Brinell hardness of 470-520 and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.26-0.35% of C, less than or equal to 0.20-0.50% of Si, 1.0-1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.20-0.70% of Cr, 0.020-0.06% of Ti, less than or equal to 0.35% of Mo, 0.0005-0.0050% of B, less than or equal to 0.3% of Cu, less than or equal to 0.018% of As and the balance of Fe and inevitable impurities. The production method comprises the following production steps of: desulfurizing molten iron; carrying out compound blowing on the top and the bottom of the converter; carrying out RH (Ruhrstahl-Heraeus) vacuum processing to protect to be poured into a continuous casting billet in the whole flow; heating the continuous casting billet; blooming; and carrying out finish rolling for later use. The loader and excvavtor scraper knife blade purposed steel has the advantages of simple ingredient, stable technology, excellent mechanical property, high cost performance and good welding performance. A hardened and tempered steel plate can be directly welded when the hardened and tempered steel plate is not preheated, and has good cold bending performance.

Description

technical field [0001] The invention belongs to the field of wear-resistant steel, and in particular relates to a blade steel for loader and excavator with a Brinell hardness (HBW 10mm / 3000KN) of 470-520 and a production method thereof. Background technique [0002] Shovel blade steel is mainly used in the manufacture of the bucket, the key part of loaders and excavators. Its performance directly determines the service life of the bucket, and it is one of the most important steel types in the construction machinery and vehicle industry. In recent years, with the development of my country's construction machinery industry, its demand is increasing. The working environment of the shovel blade steel is very harsh. When working, when the shovel blade shovels into materials such as ore, sand, coal, etc., there will be strong friction and collision with the material directly. Therefore, in order to increase the service life of the shovel blade, use The steel requirements are hars...

AI Technical Summary

Problems solved by technology

Among the published patents, the patents applied by foreign and domestic Wugang, Chongqing Iron and Steel Co., Ltd., etc. are quite different from the design concept of this patent; the Chinese patent literature, whose patent number is ZL200610018574.7 "Steel for Shovel Blades of Loaders and Its Production "Method" and "Shovel Blade Steel with Brinell Hardness of 430-470 and Production Method thereof" with application number CN 201010224423.3 are close to the present invention, but the hardness levels are different. , the steel plate has the problem of poor cold bending performance, which is related to the high residual alloy elements such as Cu and As after analysis, so the residual elements such as Cu are limited in this patent

[0004] To sum up, this patent adopts the technological process of converter + vacuum treatment + continuous casting + rolling to produce a kind of scraper blade steel. The Brinell hardness of the steel plate is 470-520. There are no similar achievements, patents and related reports

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