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550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof

A low-carbon bainite and engineering machinery technology, applied in the field of low-alloy high-strength steel, can solve the problems of large alloy content, reduced production efficiency and high cost, and achieve the effects of reducing production cost, improving production efficiency and low production cost

Active Publication Date: 2012-08-22
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the above patents are: (1) high alloy content and high cost; (2) RPC technology is required to reduce production efficiency

Method used

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  • 550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof
  • 550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The chemical composition weight percentage of low carbon bainite construction machinery steel is as follows:

[0061] C: 0.06%, Si: 0.32%, Mn: 1.62%, S≤0.005%, P≤0.010%, Nb: 0.04%, Mo: 0.008%, Ti: 0.027%, B: 0.0018%, Cr: 0.38%, Al: 0.035%, the rest is Fe and trace impurities.

[0062] 2. The manufacturing method of low-carbon bainitic steel for engineering machinery. The production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling and controlled cooling. The operation steps are as follows:

[0063] Desulfurization of hot metal is strictly carried out in accordance with the process regulations, the sulfur in the hot metal is controlled at 0.002%, the temperature is 1280°C, and the slag on the surface of the hot metal is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging materials such as lime are added...

Embodiment 2

[0069] 1. The chemical composition weight percentage of low carbon bainitic construction machinery steel is as follows:

[0070] C: 0.07%, Si: 0.29%, Mn: 1.64%, S≤0.005%, P≤0.010%, Nb: 0.048%, Mo: 0.006%, Ti: 0.025%, B: 0.0014%, Cr: 0.38%, Al: 0.031%, the rest is Fe and trace impurities.

[0071] 2. The manufacturing method of low-carbon bainitic steel for engineering machinery. The production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling and controlled cooling. The operation steps are as follows:

[0072]Desulfurization of hot metal is strictly carried out in accordance with the process regulations. The sulfur in the hot metal is controlled at 0.001%, the temperature is 1221°C, and the slag on the surface of the hot metal is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging materials such as lime are a...

Embodiment 3

[0078] 1. The chemical composition weight percentage of low carbon bainitic construction machinery steel is as follows:

[0079] C: 0.06%, Si: 0.30%, Mn: 1.59%, S: ≤0.005%, P: ≤0.010%, Nb: 0.038%, Mo: 0.006%, Ti: 0.023%, B: 0.0014%, Cr: 0.37 %, Al: 0.034%, the rest is Fe and trace impurities.

[0080] 2. The manufacturing method of low-carbon bainitic steel for engineering machinery. The production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, RH refining, slab continuous casting, controlled rolling and controlled cooling. The operation steps are as follows:

[0081] Desulfurization of molten iron is strictly carried out in accordance with the process regulations. The sulfur in the molten iron is controlled at 0.001%, the temperature is 1200°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging materials such a...

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Abstract

The invention relates to a low-carbon bainitic steel for engineering machinery, which is prepared from the following chemical components in percentage by weight: 0.05-0.10% of C, 0.20-0.50% of Si, 1.50-1.80% of Mn, at most 0.010% of S, at most 0.018% of P, at most 0.10% of Nb, at most 0.10% of Mo, 0.010-0.040% of Ti, 0.0010-0.0030% of B, 0.20-0.50% of Cr, 0.015-0.050% of Al and the balance of Fe and trace impurity. The existing equipment is utilized; molten iron pretreatment, reblowing converter smelting, LF (ladle furnace) refining, RH refining, and plate blank continuous casting are carriedout; and the contents of part of elements are adjusted, microalloying treatment, TMCP (thermomechanical rolling process) production, controlled rolling and water cooling are carried out, and no heat treatment is required, thereby obtaining the bainitic steel for engineering machinery, which has the advantages of high strength and favorable low-temperature toughness. The bainitic steel for engineering machinery is widely used in the fields of engineering machinery manufacturing and the like, such as large-size load-bearing steel structures, large-size earth mover, autocranes, excavators, mining machines, hydraulic supports, electric wheel dump trucks, mine cars and the like.

Description

technical field [0001] The invention relates to a low-carbon bainite steel and a preparation method thereof, belonging to the field of low-alloy high-strength steel. Background technique [0002] Steel plates of various specifications are widely used in construction machinery manufacturing, bridge erection, shipbuilding, vehicle manufacturing, aviation and other fields. Due to the limitation of service conditions and welding process, the steel plate for this kind of use not only requires the material to have sufficient strength and plasticity, but also requires a certain low temperature toughness and excellent welding performance to meet the requirements of field operations and manufacturing processes. Considering resources and cost accounting, users generally require the use of high-performance, low-cost metal materials. Low-carbon bainitic steel was developed to meet this demand, and has been widely used in large-scale load-bearing steel structures, large bulldozers, truc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/04C21D8/00
Inventor 李灿明周平王建景吴德发高立福杨建勋任继银李生根李永强李艳李辉
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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