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Melting technology suitable for producing nodulizing agent by using 3-ton intermediate frequency furnace

A nodulizer and intermediate frequency furnace technology, applied in the direction of process efficiency improvement, furnace, electric furnace, etc., can solve problems such as heavy smoke, achieve the effects of slowing down the melting speed, uniform composition, and avoiding loss and loss

Active Publication Date: 2017-05-31
南京浦江合金材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In production practice, it is found that when adding fine iron filings or small pieces of scrap iron and steel to the molten charge, a large amount of smoke will be generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a smelting process applicable to the production of nodulizers in a 3-ton intermediate frequency furnace. The smelting process of nodulizers consists of Si, Mg, RE, Ca, and Fe. The components of the process nodulizer are: Si: 44-48%, Mg: 4-11%, RE: 0.8-6.5%, Ca: 0.8-3.5%, and the balance is Fe.

[0025] When the composition of the nodulizer is by mass percentage: Si: 44%, Mg: 4%, RE: 0.8%, Ca: 0.8%, and the balance is Fe; the smelting process of the nodulizer is as follows: Follow these steps:

[0026] Step 1: Carry out material inspection first, and then calculate according to the content of each component of the nodulizer to be produced, first add ferrosilicon to the 3-ton intermediate frequency furnace as the bottom, then add magnesium ingots; then add scrap steel, there are two forms of scrap steel One is strip-shaped, the other is block-shaped, and the weights of the two forms of steel scrap are equal. First, block-shaped steel scrap is add...

Embodiment 2

[0038] This embodiment provides a smelting process applicable to the production of nodulizers in 3-ton intermediate frequency furnaces. The smelting process of nodulizers consists of Si, Mg, RE, Ca, and Fe. The percentages by weight are: Si: 44-48%, Mg: 5-6%, RE: 0.8-1.2%, Ca: 1-2%, Ba: 1-2%, Al≤1%, and the balance is Fe;

[0039] When the composition of the spheroidizing agent is by weight percentage: Si: 44%, Mg: 5%, RE: 0.8%, Ca: 1%, Ba: 1%, Al: 0.1%, and the balance is Fe, spheroidizing The smelting process of the nodulizer The smelting process of the nodulizer is carried out in the following steps:

[0040] Step 1: Carry out material inspection first, and then calculate according to the content of each component of the nodulizer to be produced, first add ferrosilicon to the 3-ton intermediate frequency furnace as the bottom, then add magnesium ingots; then add scrap steel, there are two forms of scrap steel , one is strip-shaped, the other is block-shaped, and the weigh...

Embodiment 3

[0052] This embodiment provides a smelting process applicable to the production of nodulizers in 3-ton intermediate frequency furnaces. The smelting process of nodulizers consists of Si, Mg, RE, Ca, and Fe. The percentages by weight are: Si: 0-44%, Mg: 7-9%, RE: 2-8%, Ca: 1-3%, and the balance is Fe;

[0053] When the composition of the nodulizer is by weight percentage: Si: 0.2%, Mg: 7%, RE: 2%, Ca: 1%, and the balance is Fe;

[0054] Smelting process of nodulizer The smelting process of nodulizer is carried out in the following steps:

[0055] Step 1: Carry out material inspection first, and then calculate according to the content of each component of the nodulizer to be produced, first add ferrosilicon to the 3-ton intermediate frequency furnace as the bottom, then add magnesium ingots; then add scrap steel, there are two forms of scrap steel One is strip-shaped, the other is block-shaped, and the weight of the two forms of steel scrap is equal. Firstly, the block-shaped s...

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Abstract

The invention discloses a melting technology suitable for producing a nodulizing agent by using a 3-ton intermediate frequency furnace. The melting technology for the nodulizing agent includes the steps of 1, silicone and iron are added into the bottom of the 3-ton medium-frequency furnace, then magnesium ingots are added, and waste steel is added, wherein the waste steel includes two types, firstly the blocky waste steel is added into the intermediate frequency furnace, and then Re and Ca components are added; 2, the current of the 3-ton medium-frequency furnace is controlled to be 450-750A, then the strip-shaped waste steel is added into the intermediate frequency furnace to be melted, the temperature in the intermediate frequency furnace is controlled to be 1250-1270 DEG C, and the furnace burden is stirred uniformly after being completely melted; and 3, the current is reduced to be 0A, then the furnace is tilted, the molten iron is poured into a nodulizing agent mold, when the temperature is lowered to 1150 DEG C, a nodulizing agent lifting hook is inserted into the nodulizing agent solution, then the nodulizing agent solution is air-cooled to room temperature, and when the nodulizing agent is cooled until the surface becomes dark red, the nodulizing agent can be lifted to a nodulizing agent stacking site by using a travelling crane.

Description

technical field [0001] The invention relates to a spheroidizing agent, in particular to a smelting process suitable for producing a spheroidizing agent in a 3-ton intermediate frequency furnace. Background technique [0002] Nodularizing agent refers to an additive that can transform graphite in cast iron into a spherical shape through spheroidizing reaction. After spheroidizing, the mechanical properties of cast iron are effectively improved, and can be widely used in complex stress, strength, Ductile iron castings with high toughness requirements, such as auto parts, pressure pipes and parts, machine tool parts, etc. [0003] At present, there are two main processes for producing nodulizers in China: [0004] 1. Most enterprises use medium-frequency induction furnaces below 1 ton to produce nodulizers. Such small-capacity electric furnaces usually use one-time addition method, that is, metal magnesium and other furnace materials are added to the furnace for melting at one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C1/10C22C30/00C22C38/02
CPCC21C1/105C21C5/52C22C30/00C22C38/002C22C38/005C22C38/02Y02P10/20
Inventor 任启才段清忠刘英陈刘剑赵战
Owner 南京浦江合金材料股份有限公司
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