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Preparation method of nickel-free magnesium refining boiler

A refining pot and nickel-magnesium technology, applied in the field of foundry, can solve the problems of high bubble content, low qualification rate, difficulty in manufacturing nickel-free steel metal magnesium refining pot, etc. Life-enhancing effect

Inactive Publication Date: 2017-11-21
LINFEN PENGTAI WEIYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the deficiencies of the prior art, and the technical problems to be solved are the difficulties in the overall manufacture of the nickel-free steel magnesium refining pot, high bubble content, and low pass rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing a nickel-free magnesium refining pot, comprising the following gate setting methods and smelting methods:

[0015] 1) The shape of the cavity is the shape of a magnesium refining pot placed upright, and the casting mold is equipped with four gates, two of which are set on the top side of the cavity, and two are set at the bottom 1 / 3 of the height of the cavity, and four gates are set in the top view. The gates are distributed in a cross outside the cavity, and the gates on the top are set adjacently;

[0016] 2) The diameter of the top two gates is 0.8d, and the diameter of the bottom two gates is 1.2d, where d is the wall thickness of the magnesium refining pot; the runners of the bottom two gates are inclined downward at 4° from the horizontal direction inclination;

[0017] 3) The smelting requirements of nickel-free steel molten steel for casting are as follows: when the molten steel is at a temperature of 1000-1100°C, add 0.3% rare earth fer...

Embodiment 2

[0019] A method for preparing a nickel-free magnesium refining pot, comprising the following gate setting methods and smelting methods:

[0020] 1) The shape of the cavity is the shape of a magnesium refining pot placed upright, and the casting mold is equipped with four gates, two of which are set on the top side of the cavity, and two are set at the bottom 1 / 3 of the height of the cavity, and four gates are set in the top view. The gates are distributed in a cross outside the cavity, and the gates on the top are set adjacently;

[0021] 2) The diameter of the top two gates is 0.8d, and the diameter of the bottom two gates is 1.1d, where d is the wall thickness of the magnesium refining pot; the runners of the bottom two gates are inclined downward at 3.5° from the horizontal direction inclination;

[0022] 3) The smelting requirements for nickel-free steel molten steel for casting are as follows: when the molten steel is at a temperature of 1000-1100°C, add rare earth ferro...

Embodiment 3

[0024] A method for preparing a nickel-free magnesium refining pot, comprising the following gate setting methods and smelting methods:

[0025] 1) The shape of the cavity is the shape of a magnesium refining pot placed upright, and the casting mold is equipped with four gates, two of which are set on the top side of the cavity, and two are set at the bottom 1 / 3 of the height of the cavity, and four gates are set in the top view. The gates are distributed in a cross outside the cavity, and the gates on the top are set adjacently;

[0026] 2) The diameter of the top two gates is 0.9d, and the diameter of the bottom two gates is 1.2d, where d is the wall thickness of the magnesium refining pot; the runners of the bottom two gates are inclined downward at 3° from the horizontal direction inclination;

[0027] 3) The smelting requirements of nickel-free steel molten steel for casting are as follows: when the molten steel is at a temperature of 1000-1100°C, add 0.4% rare earth fer...

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Abstract

The invention relates to a preparation method of a nickel-free magnesium refining boiler and belongs to the technical field of casting. According to the preparation method of the nickel-free magnesium refining boiler, the technical problem of the low overall qualification rate of metal magnesium refining boilers adopting nickel-free steel is solved. According to the technical scheme, the preparation method of the nickel-free magnesium refining boiler comprises the following sprue forming modes and smelting methods: (1) four sprues are formed in a casting mould, two of the sprues are formed in the side face of the top of a mould cavity, the other two sprues are formed in the position at one third height of the bottom of the mould cavity, the four sprues are distributed outside the mould cavity in a cross shape at the time of overlooking, and the sprues in the top are adjacently formed; (2) the diameter of each sprue in the top is 0.8-0.9d, and the diameter of each sprues at the bottom is 1.1-1.2d, wherein d is the wall thickness of the magnesium refining boiler; and (3) the smelting requirements of nickel-free molten steel for casting is listed as follows: when the temperature of the casting molten steel is 1000-1100 DEG C, rare earth ferrosilicon with the mass being 0.3%-0.4% of the mass of the molten steel is added, smelting is conducted for 20-30 min, then the temperature is decreased to 850-1000 DEG C, and casting is conducted.

Description

technical field [0001] The invention discloses a method for preparing a nickel-free magnesium refining pot, which belongs to the technical field of casting. Background technique [0002] Since the refining of metal magnesium alloy requires that the nickel content in the composition should not be greater than 2 / 1000, the prior art mostly uses magnesium refining pots welded with nickel-free high-quality boiler steel plates. Although this magnesium refining pot can ensure that the nickel content of the magnesium alloy does not exceed the standard, it has a short life and is uneconomical because it is a welded product. However, due to the high melt viscosity of nickel-free boiler steel, it is difficult to discharge entrained air bubbles. The weight of the overall magnesium refining pot is generally about 2 tons. Steel plates or pot bottoms are much more difficult. With the current casting method, the overall casting yield is only 40%, which is far from meeting the requirements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08B22C9/22
CPCB22C9/082B22C9/22
Inventor 张国安崔国华
Owner LINFEN PENGTAI WEIYE
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