Method for preparing weather-resisting steel ingot

Abstract

The invention relates to a method for preparing weather-resisting steel ingots, aiming at special technique requirements of weather-resisting steel ingots. The method comprises the following steps: heating to smelt an iron-carbon alloy inside a vacuum sensing smelting furnace under the protection of argon, subsequently adding a weather-resisting reinforcing and toughening substance to smelt, casting into ingots, heating and forging the ingots, and annealing at middle temperature so as to prepare the pole-shaped weather-resisting steel ingots. The method is advanced in process and detailed and precise in data, the chemical and physical properties and mechanical properties of the weather-resisting steel are stable, the grain size is 12.3mu m, the extension strength is as high as 836MPa, the yield strength is as high as 721MPa, the impact toughness is as high as 354J, the corrosion rate in a 3.5% NaCl solution can be reduced by 73%, and the method is an ideal method for weather-resisting steel ingots.

Description

technical field [0001] The invention relates to a method for preparing weather-resistant steel ingots, which belongs to the technical field of ferrous metal smelting preparation and application. Background technique [0002] Weathering steel is a kind of structural steel suitable for climate change. Due to the change of climate, the impregnation of rain, snow, fog and ice, the blowing of wind and sand, and the corrosion and beating of seawater will cause changes in the mechanical properties, chemical and physical properties of the steel. As a result, the hardness of the steel is reduced, the brittleness is increased, the wear resistance is deteriorated, and the tensile strength is weakened, so that the parts cannot be used normally, and even cause accidents. [0003] Weathering steel is generally used in the manufacture of train carriages, containers and mobile equipment. Most of these equipment require high strength, high toughness, and corrosion resistance. It puts forwar...

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Problems solved by technology

[0004] In the process of preparing weather-resistant steel, in order to meet the high requirements of weather resistance, some methods of changing ingredients, applying pressure, surface treatment, chemical coating, etc., but these methods have different degrees of disadvantages, so that the weather resistance cannot be achieved. Steel requirements hinder the development and application of weathering steel technology

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