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Large-sized wear resistant steel with high uniformity and manufacturing method thereof

A manufacturing method and large-scale technology, applied in the field of alloy steel, can solve the problems of low impact toughness, environmental pollution, forming failure, etc., and achieve the effects of improving stability, simple production process and excellent plate shape.

Inactive Publication Date: 2018-06-12
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the hardenability and hardenability of the material, a lot of carbon and alloy elements to improve the hardenability are added. At present, the materials of large-scale wear-resistant steel workpieces mainly include multi-element alloy steel, chromium-based white cast iron, etc., which are produced by casting. It pollutes the environment, various metallurgical defects are also difficult to control, and the impact toughness is very low; if the above-mentioned materials are formed by forging or stamping forming methods to form steel plates into semi-finished products with the target workpiece shape, during the processing and forming process, the processed parts are prone to damage. Molding defects, including cracks, etc., lead to molding failure

Method used

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  • Large-sized wear resistant steel with high uniformity and manufacturing method thereof
  • Large-sized wear resistant steel with high uniformity and manufacturing method thereof
  • Large-sized wear resistant steel with high uniformity and manufacturing method thereof

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Effect test

Embodiment 1

[0044] The chemical composition of this embodiment is C: 0.25%, Si: 0.43%, Mn: 4.50%, Cr: 1.22%, Ni: 1.25%, Mo: 0.31%, S: 0.005%, P: 0.005 %, the balance is Fe and unavoidable impurities. The steel plate manufacturing process includes: converter smelting, LF refining, RH refining, slab continuous casting; medium and heavy plate rolling mills are used for rolling, in which the heating temperature is 1200°C, the final rolling temperature is 1000°C, the rolling thickness is 300mm, and air cooling after rolling. The tensile strength of the obtained steel plate is 1760Mpa, the elongation is 7%, the surface hardness is HB550, and the impact energy at room temperature is 31J.

Embodiment 2

[0046] The chemical composition of the present invention is C: 0.32%, Si: 0.48%, Mn: 5.02%, Cr: 1.11%, Ni: 1.31%, S: 0.005%, P: 0.015%, and the balance is Fe and unavoidable impurities. Manufacturing process: converter smelting, LF refining, die casting; rolling is carried out by a plate rolling mill, in which the heating temperature is 1220°C, the final rolling temperature is 1050°C, the rolling thickness is 350mm, and air-cooled after rolling. The tensile strength of the obtained steel plate is 2080Mpa, the elongation is 5%, the surface hardness is HB623, and the impact energy at room temperature is 16J.

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Abstract

The invention relates to large-sized wear resistant steel with high uniformity. The steel is prepared from the chemical components according to weight percent: 0.1 to 0.6% of C, 4.0 to 6.0% of Mn, 0.30 to 0.60% of Si, 0 to 3.0% of Cr, 0 to 2.0% of Ni, 0 to 1.0% of Mo, less than or equal to 0.030% of S, less than or equal to 0.030% of P and the balance of Fe and inevitable impurities. The maximum thickness of a steel plate can reach more than 400 mm, the surface and core hardness of the steel can reach more than HB600 in air cooling conditions, the plate type is good, and additionally, the steel has good impact toughness. According to the steel for a novel large-sized wear resistant workpiece, when the thickness of the steel plate reaches 400 mm, the steel plate has high toughness on the premise of high hardness, additionally, the microstructure of the steel plate is uniform, the difference between core and surface properties is small, the microstructure of the workpiece is compact, thesteel is pure, and the performance of each part is uniform. The steel is especially suitable for large-section wear resistant steel workpieces such as lining plates of autogenous mills and semi-autogenous mills and the like and has the advantages of uniform microstructure property, low cost and excellent wear resistance.

Description

technical field [0001] The invention relates to the technical field of alloy steel, in particular to a large-scale high-uniformity wear-resistant steel and a manufacturing method thereof. Background technique [0002] In metallurgy, mining, electric power, building materials and other industrial industries, a large number of large-scale wear-resistant steel workpieces are used for crushing and grinding of materials. Typical products such as liners are subjected to different degrees of wear and impact, resulting in wear-resistant Steel workpieces have a short service life, are frequently replaced, and consume a lot of money. They are the main wearing parts. The maximum specification of the existing wear-resistant steel plate is generally not more than 80mm. For larger crushing equipment, the volume of the wear-resistant steel workpiece is huge, and the thickness specification is often greater than 300mm. Large-scale wear-resistant steel workpieces are mainly subjected to wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/44C21D8/02
Inventor 梁小凯孙新军雍岐龙贾书君刘清友
Owner CENT IRON & STEEL RES INST
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