High-pressure bottom-blowing refining casting device and method for smelting high-nitrogen steel by using same

A high-nitrogen steel and high-pressure technology is applied in the field of refining and casting devices for efficient production of high-nitrogen steel, which can solve the problems of high production cost, polluted molten steel, slow reaction speed, etc., and achieves good ingot quality, cost saving, and convenient adjustment. Effect

Active Publication Date: 2014-06-25
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, nitriding alloys are added during the smelting process to provide nitrogen elements required for high-nitrogen stainless steel. The nitrogen addition method is simple and easy to operate, but the problem is that the yield of nitrogen during alloying is low, and the nitrogen content in the steel is not easy to control. During the smelting process, nitrogen bubbles are easy to form in the high-nitrogen area; ferrochromium nitride and ferromanganese nitride generally have high impurity content, which pollutes molten stee

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  • High-pressure bottom-blowing refining casting device and method for smelting high-nitrogen steel by using same
  • High-pressure bottom-blowing refining casting device and method for smelting high-nitrogen steel by using same

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Embodiment 1

[0043] Embodiment 1 is applicable to a high-pressure bottom blowing refining and casting device for smelting high-nitrogen steel small ingots.

[0044] The induction coil 12 of the high-pressure bottom-blowing refining casting device of this embodiment is made of copper hollow tube, which can generate an intermediate frequency magnetic field of 2500-8000 Hz. The safety refractory layer 14 is magnesia refractory mud material with a thickness of 10mm. The water-cooled copper crucible layer 13 16 water-cooled copper plates 21 and 16 divided refractory sheets 20 are evenly spaced to form a cylinder. The outer diameter of the cylinder is 124mm, the inner diameter is 84mm, and the height is 150mm. The thickness of the water-cooled copper plate 21 is 20mm. MPa, flow rate 10~15m 3 / h, divided refractory sheet 20 is made of refractory mica, 3mm thick, 20mm wide, 150mm high, water-cooled movable bottom plate 8 thick 20mm, diameter 180mm, cooling water flow 10~15m 3 / h, the bottom blowi...

Embodiment 2

[0047] High-pressure bottom blowing refining casting device suitable for smelting high-nitrogen steel ingots:

[0048] The induction coil 12 of the high-pressure bottom-blowing refining casting device of this embodiment is made of copper hollow tube, and the induction coil 12 can generate an intermediate frequency magnetic field of 5000~10000 Hz. The crucible layer 13 is composed of 24 water-cooled copper plates and 24 divided refractory sheets evenly spaced. The outer diameter of the cylinder is 320mm, the inner diameter is 240mm, the height is 400mm, the thickness of the water-cooled copper plate is 40mm, and the internal cooling water pressure is 0.5~0.8MPa, and the flow rate is 40~ 50m 3 / h, divided refractory sheet 20 is made of refractory mica, 5mm thick, 40mm wide, 300mm high, water-cooled movable bottom plate 40mm thick, 340mm in diameter, cooling water flow 40~50m 3 / h, the bottom blowing hole is opened at 60mm eccentricity, the bottom blowing plug 10 is made of magn...

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Abstract

The invention discloses a high-pressure bottom-blowing refining casting device and a method for smelting high-nitrogen steel by using the same. The casting device main body is a lamellar barrel-shaped structure; the structure from the outside to the inside is as follows: a safety flame retardant layer, a water-cooling copper crucible layer and a cutting refractory sheet, wherein an induction coil is spiral and wound on the outer wall of the safety flame retardant layer; the induction coil is connected with an electric control cabinet regulating device; a bottom-blowing system is arranged on a water-cooling movable bottom plate. The method for smelting high-nitrogen steel by using the device comprises the steps of loading, shell-producing, smelting, casting and hoisting. According to the invention, remarkable effects are as follows: refining and casting are completed in a same container, and are quick and convenient. High-nitrogen steel is produced under a high-pressure bottom-blowing condition, and efficiency is high; a cheap nitrogen gas is applied as a nitriding source, so that cost is saved. And steel ingot content is high and solidification quality is good.

Description

technical field [0001] The invention belongs to the application field of high-pressure refining and casting special steel, and in particular relates to a device for refining and casting special steel under high-pressure conditions and a method for smelting high-nitrogen steel. A refining and casting device for efficiently producing high-nitrogen steel by bottom blowing method and a method for smelting high-nitrogen steel with it. Background technique [0002] High nitrogen steel (High Nitrogen Steels, HNS) is a special steel with superior performance, in which nitrogen is a beneficial alloying element, which can stabilize and expand the austenite phase region, increase the strength of steel without reducing plasticity and toughness, and improve Corrosion resistance of steel (including pitting corrosion, crevice corrosion, stress corrosion, etc.). [0003] When the nitrogen content exceeds 0.4%, the beneficial effect of nitrogen can be quickly highlighted. However, adding n...

Claims

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Application Information

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IPC IPC(8): C21C7/072B22D7/00
Inventor 王书桓赵定国刘新生
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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