Productive technology of short flow of structure type cast iron part

A production process and short process technology, applied in the field of cast iron production, can solve the problems of inability to produce high-strength cast iron, high energy consumption of cast iron, low energy consumption, etc., achieve significant energy and economic benefits, reduce energy consumption and production costs, and reduce energy consumption. The effect of low consumption

Inactive Publication Date: 2012-01-04
QINGZHOU HAOZHANG CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at many deficiencies in the prior art, such as high energy consumption, serious pollution, and inability to produce high-strength cast iron in the conventional production process of producing cast iron, and provides a new short-process production process of structural iron castings, which can Low power consumption, high-strength iron castings can be obtained, with significant energy, economic and environmental benefits

Method used

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  • Productive technology of short flow of structure type cast iron part
  • Productive technology of short flow of structure type cast iron part
  • Productive technology of short flow of structure type cast iron part

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A short-process production process for structural cast iron parts. The main equipment used are: blast furnace, 3-5 ton medium-frequency induction furnace (high-end voltage 760V, low-end voltage 380V, maximum power 3000KW, frequency 1800-2500Hz), 8 -10T / h holding furnace, molten iron state analyzer (microcomputer thermal analysis comprehensive parameter tester), etc. It is produced according to the following process steps:

[0020] (1) Smelting overheating: 70% (by weight) of blast furnace molten iron is first loaded into the medium-frequency induction furnace, and then 30% (by weight) of scrap steel is loaded. Stir to superheat the molten iron to 1500°C to complete the smelting and superheating of the material. The smelting superheating power is 3000KW. (2) Heat preservation and refining: heat the molten iron superheated to 1500°C for 10 minutes, and then use (15%Al+85%CaO) refining degasser for degassing and refining, the addition of which is 0.15 %, and the state an...

Embodiment 2

[0022] The equipment adopted in the present embodiment is identical with embodiment 1, and it is produced by following processing steps:

[0023] (1) Smelting overheating: 75% (by weight) of blast furnace molten iron is first loaded into the intermediate frequency induction furnace, and then 25% (by weight) of scrap steel is loaded. Stir to superheat the molten iron to 1525°C to complete the smelting and superheating of the material. The smelting superheating power is 2900KW. (2) Heat preservation and refining: Heat the hot metal overheated to 1525°C for heat preservation, the heat preservation time is controlled at 15 minutes, and then use (15% Al+85% CaO) refining degasser for degassing and refining, the addition is 0.15%, And the state analysis of molten iron is carried out through the comprehensive parameter measuring instrument for thermal analysis of the furnace. (3) Inoculation treatment: SiCaBa alloy is used as an inoculant to inoculate the metal liquid after heat pre...

Embodiment 3

[0025] The equipment adopted in the present embodiment is identical with embodiment 1, and it is produced by following processing steps:

[0026] (1) Smelting overheating: 80% (by weight) of blast furnace molten iron is first loaded into the intermediate frequency induction furnace, and then 20% (by weight) of scrap steel is loaded. Stir to superheat the molten iron to 1550°C to complete the smelting and superheating of the material. The smelting superheating power is 2800KW. (2) heat preservation and refining: heat the molten iron overheated to 1550 ℃, and the heat preservation time is controlled at 20 minutes, and then use (15%Al+85%CaO) refining degasser to carry out degassing and refining, the addition amount is 0.15%, and The state analysis of the molten iron is carried out by the comprehensive parameter measuring instrument for thermal analysis in front of the furnace. (3) Inoculation treatment: SiCaBa alloy is used as an inoculant to inoculate the metal liquid after he...

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Abstract

The invention discloses a productive technology of a short flow of structure type cast iron parts, which belongs to the technology of cast iron production, mainly solves the problems that the normal flow of cast iron production has large energy consumption and serous pollution, and the productive technology of the short flow can not produce high-strength cast iron. The invention comprises the following steps: using 70-90 percent (in part by weight) of blast furnace hot metal as burden, adding 10-30 percent (in part by weight) scrap steel adjusting component into the blast furnace hot metal, smelting the mixture in a medium-frequency induction furnace, and stirring through high-power electromagnetic so as to enable the hot metal to be overheated, then heat insulating, refining to deair, inoculating, and pouring castings. The overheated power of smelting of the medium-frequency induction furnace is 2500-3000KW. Though applying the technology of the invention, structure type iron castings with tensile strength of 200-350MPa can be gained, and the invention has the advantages of high efficiency, low consumption and hygiene, and has remarkable energy, economic and environment benefits.

Description

technical field [0001] The invention relates to the technical field of cast iron production, in particular to a production process for producing iron castings using a short-flow process. Background technique [0002] At present, the short-flow process is widely used in steelmaking because of its short process, high production efficiency, and obvious energy saving and consumption reduction. However, the application of the short-flow process in cast iron production is limited due to production conditions, technologies, etc. Restricted by factors, the current short-flow process can only produce low-grade iron castings, whose tensile strength is generally less than 150MPa, and there is no mature short-flow process technology for the production of structural iron castings with high tensile strength, which greatly restricts Application of short-flow process in the production of high-quality castings. [0003] The conventional production process of cast iron is: molten iron in bla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08B22D1/00C21C7/076
CPCY02P10/20
Inventor 贾贵平李明弟王远成孙一民刘学亭王志刚李大勇张保议
Owner QINGZHOU HAOZHANG CASTING
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