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Steel plate for construction machinery and preparation method thereof

A technology for construction machinery and steel plates, applied in the production of thin-gauge high-strength wear-resistant steel, can solve the problems of increased cost, low low-temperature impact toughness and strength, complex process, etc., and achieve the effect of low cost

Active Publication Date: 2021-11-09
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, such steel plates are commonly used in the grades of NM360-NM400, Q345 and surface-treated Q235, etc. However, these wear-resistant steel plates mainly rely on the addition of a large amount of alloy elements or complicated process flow
[0004] Chinese patent application CN104846267A discloses "a wear-resistant steel base plate for loaders". The steel plate alloy composition involved in this patent has a mass percentage of C element of 2.2-2.5%, a mass percentage of V element of 8.5-11%, Cr element The mass percentage of Ni element is 5-6.5%, and the mass percentage of Ni element is 2-3%. The content of alloy elements far exceeds the content of this application, which will inevitably increase its cost; and its welding performance index CEV is far lower than this application patent Involving low steel grades
[0005] Chinese patent application CN104451536A discloses "a method for quick boronizing of Q235 steel". This patent uses Q235 steel as a raw material to complete the boronizing steel plate, which not only has complicated process, long production cycle, and low production efficiency; The low-temperature impact toughness and strength are lower than the patent steel plate applied for this time
[0006] Chinese patent application CN106013283A discloses "a new type of lightweight loader bucket and loader". The patent proposes to use NM360-NM400 as the material for the bucket wall plate of the loader, but the patent involves Mo, Cr, and Nb in the alloy composition of the steel plate The addition of elements such as , Ti, etc. will inevitably bring disadvantages such as a large increase in cost and a high welding performance index CEV, and the requirements for production process conditions are higher than those of the steel plate of this application.

Method used

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  • Steel plate for construction machinery and preparation method thereof
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  • Steel plate for construction machinery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, the production process of low-cost and high-performance construction machinery steel is molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling, and heat treatment.

[0041] The specific operation steps are as follows:

[0042] The blast furnace molten iron is subjected to KR pre-desulfurization operation, the sulfur in the molten iron is controlled within 0.015%, and the slag on the surface of the molten iron is removed after pre-desulfurization. After desulfurization, the molten iron enters the converter for smelting. The temperature of the molten iron entering the furnace is 1254°C. The slag is added 3 minutes before the end point. The time for pressing the gun at the end point is not less than 1 minute. When the molten steel reaches a quarter, add ferromanganese, ferrosilicon, and ferrovanadium for alloying. When the molten steel reaches three quarters, the ad...

Embodiment 2

[0052] In this embodiment, the production process of low-cost and high-performance construction machinery steel is molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling, and heat treatment.

[0053] The specific operation steps are as follows:

[0054] The blast furnace molten iron is subjected to KR pre-desulfurization operation, the sulfur in the molten iron is controlled within 0.015%, and the slag on the surface of the molten iron is removed after pre-desulfurization. After desulfurization, the molten iron enters the converter for smelting. The temperature of the molten iron entering the furnace is 1267°C. The slag must be added 3 minutes before the end point. The slag is melted and penetrated throughout the process. The time for pressing the gun at the end point is not less than 1 minute. Inside. When the molten steel reaches a quarter, add ferromanganese, ferrosilicon, and ferrovan...

Embodiment 3

[0063] In this embodiment, the production process of low-cost and high-performance construction machinery steel is molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling, and heat treatment.

[0064] The specific operation steps are as follows:

[0065] The blast furnace molten iron is subjected to KR pre-desulfurization operation, the sulfur in the molten iron is controlled within 0.015%, and the slag on the surface of the molten iron is removed after pre-desulfurization. After desulfurization, the molten iron enters the converter for smelting. The temperature of the molten iron entering the furnace is 1340°C. The slag must be added 3 minutes before the end point. The slag is melted and penetrated throughout the process. The time for pressing the gun at the end point is not less than 1 minute. Inside. When the molten steel reaches a quarter, add ferromanganese, ferrosilicon, and ferrovan...

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Abstract

The invention belongs to the technical field of steel production for construction machinery, and provides a steel plate for construction machinery and a preparation method thereof. The chemical composition and mass percentage of the steel are: C: 0.16-0.19%, Si: 0.20-0.40 %, Mn: 1.20-1.35%, P: ≤0.018%, S: ≤0.006%, V: 0.010%-0.020%, Ti: 0.010%-0.025%, Al: 0.015%-0.050%, the rest is Fe and not avoid inclusions. The preparation method is as follows: blast furnace molten iron is subjected to KR pretreatment, desulfurized molten iron and scrap steel are put into a converter for smelting, and then LF+RH refining is carried out. Adopt double-stand two-stage controlled rolling process, design reasonable rough rolling and finishing rolling process, and finally carry out quenching and tempering heat treatment. The yield strength of the steel plate obtained in the present invention is all above 440MPa, the tensile strength is all above 540MPa, and the elongation after fracture is all above 15%; the low temperature impact energy at 0°C is all above 27J; the hardness is controlled above 175HBW; the CEV is controlled at 0.39% The following provides a guarantee for the good welding performance of the steel plate.

Description

technical field [0001] The invention belongs to the technical field of production of thin-gauge high-strength wear-resistant steel, and provides a low-cost high-performance steel plate with good strength, toughness, hardness and formability and a production process thereof, which is useful for the development of new lightweight construction machinery products Provided technical support. Background technique [0002] With the vigorous development of my country's infrastructure construction in recent years, construction machinery such as loaders and excavators have been widely used and rapidly popularized in infrastructure construction, competition among production enterprises has intensified, and construction machinery products are moving towards low-cost, lightweight, and long-term The direction of life and high efficiency is developed. Abrasion is one of the main ways to cause the bottom plate of this type of mechanical bucket to be scrapped. During use, it is not only stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C21D8/02
CPCC21D8/0205C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 曹阳麻衡王月香王腾飞李艳霍孝新陈爱娇
Owner SHANDONG IRON & STEEL CO LTD