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Molten steel for forgings used for manufacturing driving wheels and its smelting method

A technology for forging steel and molten steel is applied in the field of materials to achieve the effect of promoting improvement, satisfying long-term safe and efficient operation, and promoting the improvement of plasticity and toughness.

Active Publication Date: 2018-02-09
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no research report on the molten steel for forgings and its smelting method used to manufacture driving wheels in domestic patent and paper searches

Method used

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  • Molten steel for forgings used for manufacturing driving wheels and its smelting method
  • Molten steel for forgings used for manufacturing driving wheels and its smelting method
  • Molten steel for forgings used for manufacturing driving wheels and its smelting method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A. Hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P0.090wt%, S 0.013wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200-2400mm, according to 15.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P0.090wt%, S 0.002wt%, the rest is Fe and unavoidable impurities.

[0041] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C 4.5wt%, Si 0.30wt%, Mn0.25wt%, P 0.090wt%, S 0....

Embodiment 2

[0051] A, hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.8wt%, Si 0.40wt%, Mn 0.38wt%, P0.102wt%, S 0.017wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200-2400mm, according to 16.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C4.7wt%, Si 0.40wt%, Mn 0.38wt%, P0.102wt%, S 0.003wt%, the rest is Fe and unavoidable impurities.

[0052] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C4.7wt%, Si 0.40wt%, Mn0.38wt%, P 0.102wt%, S 0.00...

Embodiment 3

[0062] A. Hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 5.0wt%, Si 0.50wt%, Mn 0.50wt%, P0.110wt%, S 0.020wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200-2400mm, according to 17.0 kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C 4.8wt%, Si 0.50wt%, Mn 0.50wt%, P0.110wt%, S 0.004wt%, the rest is Fe and unavoidable impurities.

[0063] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C 4.8wt%, Si 0.50wt%, Mn0.50wt%, P 0.110wt%, S 0...

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Abstract

The invention discloses molten forging steel for manufacturing crane wheels and a smelting method thereof. The molten forging steel for manufacturing the crane wheels has the following chemical components in percentage by weight: 0.32-0.38 wt% of C, 1.10-1.30 wt% of Si, 1.10-1.25 wt% of Mn, 0.20-0.30 wt% of Cr, 0.015-0.030 wt% of Ti, S not more than 0.004 wt%, P not more than 0.012 wt%, O not more than 0.0010 wt%, H not more than 0.00015 wt%, and the balance of Fe and inevitable impurities. The preparation method comprises such process steps as KR method molten iron pretreatment deep desulfurization, converter smelting, LF steel ladle furnace refining and VD furnace vacuum refining. The molten steel, provided by the invention, is high in cleanness and low in inclusion content; and the forging steel for manufacturing the crane wheels is high in strength and toughness and excellent in wear and corrosion resistance, prominently improves the impact toughness and the fatigue resistance of the crane wheels in the use process, and prolongs the service life of the crane wheels.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to molten steel for forgings used for manufacturing driving wheels and a smelting method thereof. Background technique [0002] During the operation of the driving wheel, intense wear occurs between the wheel and the rail. The wheel tread is required to have high hardness, high strength and good impact toughness to improve the wheel's bearing capacity, wear resistance, fatigue resistance and impact resistance. In order to ensure that the driving wheel steel has the above properties, it is required that the forging steel material used to manufacture the driving wheel has high cleanliness, high strength, high toughness and good wear resistance and corrosion resistance. Most of the currently used driving wheel steels are produced from high-carbon steels such as 65 steel and 65Mn. The steel has good hardness and wear resistance, but its plastic toughness is relatively poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/14
CPCC22C38/02C22C38/04C22C38/14C22C38/18
Inventor 陈伟赵宇张卫强陆大章文玉兵王永志张瑜邓家木曹阳黄静赵卫东
Owner WUKUN STEEL
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