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A vanadium-niobium micro-alloyed weather-resistant electrified railway catenary support hot-rolled H-shaped steel and its preparation method

A technology of electrified railways and vanadium-niobium microalloys, which is applied in the field of metal material production, can solve problems such as low strength grades, achieve the effects of improving strength and toughness, reducing carbon content, and improving toughness and plasticity

Active Publication Date: 2018-07-27
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are H-shaped steels for galvanized-free electrified railway catenary pillars, but the yield strength of this H-shaped steel is 362-368MPa, the tensile strength is 423-431MPa, and the strength level is low, which is not suitable for some catenaries with higher strength requirements. H-shaped steel for pillars
At present, there is no research report on the chemical composition and production process used in the present invention to prepare vanadium-niobium microalloyed weather-resistant electrified railway catenary pillars for hot-rolled H-shaped steel, and there is no hot-rolled H-shaped steel for catenary pillars produced by the present invention Research reports on process mechanical properties and inclusions

Method used

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Examples

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Effect test

preparation example Construction

[0023] The preparation method of the vanadium-niobium micro-alloyed weather-resistant electrified railway catenary support hot-rolled H-shaped steel comprises the following steps:

[0024] A. Hot metal pretreatment desulfurization: transport the blast furnace hot metal to the KR method hot metal pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2500~2800mm, and the amount of 10.0~12.0 kg / t steel is added to the conventional CaO desulfurization agent. For desulfurization treatment, the stirring time is controlled to 8 minutes; after the stirring is completed, the slag removal operation is carried out to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and the desulfurization slag is removed; the pretreated molten iron is obtained;

[0025]B. Molten steel smelting: Pretreated molten iron of 960kg / t steel in step A, refined steel scrap of 80kg / t steel, pig iron of 75kg / t steel, copper plate of 3.7-5.7kg / t...

Embodiment 1

[0040] A. Hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.0wt%, Si 0.25wt%, Mn 0.30wt%, P0.090wt%, S 0.030wt%, the rest is Fe and unavoidable impurities) transport Go to the KR method molten iron pretreatment device for desulfurization treatment. The insertion depth of the stirring head is controlled at 2500mm. According to the amount of 10.0kg / t steel, add conventional CaO desulfurization agent for desulfurization treatment. The stirring time is controlled at 8 minutes; After the slag operation, ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the composition of the molten iron after pretreatment is controlled as follows: C 4.0wt%, Si 0.25wt%, Mn 0.30wt%, P 0.090wt%, S 0.008 wt%, the rest is Fe and unavoidable impurities.

[0041] B, molten steel smelting: the pretreatment desulfurization molten iron of A step 960kg / t steel (chemical composition C 4.0wt%, Si0.25wt%, Mn 0.30wt%, P ...

Embodiment 2

[0051] A, molten iron pretreatment desulfurization: blast furnace molten iron (chemical composition C 4.2wt%, Si 0.38wt%, Mn 0.40wt%, P0.080wt%, S 0.025wt%, the rest is Fe and unavoidable impurities) transport Go to the KR method molten iron pretreatment device for desulfurization treatment. The insertion depth of the stirring head is controlled at 2600mm. According to the amount of 11.0 kg / t steel, add conventional CaO desulfurization agent for desulfurization treatment. The stirring time is controlled at 8 minutes; After the slag operation, ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the composition of the molten iron after pretreatment is controlled as follows: C 4.2wt%, Si 0.38wt%, Mn 0.40wt%, P 0.080wt%, S0. 0.06wt%, the rest is Fe and unavoidable impurities.

[0052] B, molten steel smelting: the pretreatment desulfurization molten iron of A step 960kg / t steel (chemical composition C 4.2wt%, Si0.38wt%, Mn 0.40wt...

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Abstract

The invention discloses hot rolled H-shaped steel for a vanadium-niobium microalloyed weather-resistant electric railway overhead contact system strut and a preparation method thereof. The preparation method comprises the following steps of A, desulfurization conducted through molten iron pretreatment; B, molten steel smelting; C, deoxidization alloying; D, molten steel refining conducted through an LF furnace; E, molten steel casting; F, billet heating, G, billet rolling; H, rapid cooling after rolling; I, natural cooling after rolling; J, H-shaped steel finishing. The hot rolled H-shaped steel has the advantages of high strength, uniform and fine microscopic structures, weather resistance and the like; in the smelting process, microalloy of vanadium and niobium is added, structural grains can be refined, the strength can be improved, and at the same time, the toughness and plasticity of the steel are effectively improved; Cu, Ni and Cr are added, so that atmospheric environment corrosion resistance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a vanadium-niobium microalloyed weather-resistant electrified railway catenary support hot-rolled H-shaped steel and a preparation method thereof. Background technique [0002] With the vigorous development of high-speed electrified railways in China, the operating speed of high-speed electrified railways has exceeded 200Km / h, and the operating mileage has exceeded 19,000 kilometers. In 2015, it jumped to the first place in the world. The catenary is the power supply equipment for high-speed electrified railways. With the increase of high-speed electrified operation, the requirements for the pillars of the main supporting components of the catenary are becoming increasingly stringent. It is not only necessary to ensure the safety and reliability of mechanical properties, but also anti-corrosion and corrosion resistance. High requirements are put forw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/48C22C38/46C22C33/04C21C7/064C21C7/06C21C7/00C21D8/00
CPCC21C7/0006C21C7/06C21C7/0645C21D8/005C22C33/04C22C38/02C22C38/04C22C38/42C22C38/46C22C38/48
Inventor 苏灿东陈伟庾郁梅王卫东邓家木张志波王朝伟徐焱
Owner WUKUN STEEL
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