CN101525677A - Production method of high-strength grey cast iron for automobile fittings - Google Patents

Production method of high-strength grey cast iron for automobile fittings Download PDF

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Publication number
CN101525677A
CN101525677A CN200910116576A CN200910116576A CN101525677A CN 101525677 A CN101525677 A CN 101525677A CN 200910116576 A CN200910116576 A CN 200910116576A CN 200910116576 A CN200910116576 A CN 200910116576A CN 101525677 A CN101525677 A CN 101525677A
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China
Prior art keywords
cast iron
production
iron
grey cast
steel scrap
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Pending
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CN200910116576A
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Chinese (zh)
Inventor
孙述全
季亮
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Wuhujinmao Liquid Science & Technology Co Ltd
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Wuhujinmao Liquid Science & Technology Co Ltd
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Priority to CN200910116576A priority Critical patent/CN101525677A/en
Publication of CN101525677A publication Critical patent/CN101525677A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a production method of high-strength grey cast iron for automobile fittings. The method comprises the following procedures: batching procedure, charging procedure, smelting procedure and pre-furnace processing procedure. In the batching procedure, furnace charges used comprise scrap steel, remelting gray iron, manganese iron alloy, ferrosilicon alloy and a carburetant with the weight ratio of the scrap steel, the remelting gray iron, the manganese iron, the ferrosilicon alloy and the carburetant being 80-90:10-20:0.5-1.0:1.0-1.8:3.5-4.0 respectively. Compared with the prior art, the high-strength grey cast iron is generated by taking the scrap steel as a main raw material and adjusting various elements in the scrap steel. The high-strength grey cast iron is characterized in that few air bubbles are produced and cracks are not easily generated in castings if the grey cast iron is poured on the castings.

Description

The production method of high-strength grey cast iron for automobile fittings
Technical field
The invention belongs to the production method of graphitic cast iron, belong to the production method of high-strength grey cast iron for automobile fittings especially.
Background technology
Producing the furnace charge of graphitic cast iron generally is made up of the new pig iron, steel scrap, foundry return and iron alloy, adding steel scrap in the furnace charge is in order to reduce the carbon content in the iron liquid, thereby improve the mechanical property of graphitic cast iron, the weight ratio of steel scrap in furnace charge is generally 10-30%, steel scrap adds too much, be easy to generate too much cementite and form spoken parts in traditional operas, influence processing and use.
Summary of the invention
It is the production method of the high-strength grey cast iron for automobile fittings of main raw material with the steel scrap that technical problem to be solved by this invention provides a kind of.
The technical scheme of technical solution problem of the present invention is: the production method of high-strength grey cast iron for automobile fittings comprises following operation: burden process, charging process, melting operation, stokehold treatment process,
In the described burden process: used furnace charge comprises steel scrap, melts down gray iron, manganeseirom, ferro-silicon, carburelant, and its weight ratio is steel scrap, foundry return, manganeseirom, ferro-silicon, carburelant=80-90: 10-20: 0.5~1.0: 1.0~1.8: 3.5-4.0.
Described manganeseirom is 65 manganese, and ferro-silicon is 75Si.
Described carburelant is 85% above coke foam for the carbon containing percent by weight.
The content that generates nitrogen element in the gray iron with steel scrap is more than 0.0063%, but nitrogen element content is too high, causes foundry goods to produce bubble easily, increases the generation of crackle, in order to reduce the content of the nitrogen element in the gray iron, also can add in furnace charge and denitrogenate agent.
Described to denitrogenate agent be Quilonum Retard, and the weight ratio of itself and steel scrap is 80-90: 0.1-0.5.
In the described charging process, reinforced order is followed successively by and melts down gray iron, carburelant, manganeseirom, ferro-silicon, insulating covering agent, steel scrap.
Described insulating covering agent is iron filings, perlite, and its consumption is advisable covering carburelant fully.
Described melting operation is: earlier with the small power blow-on, after 5-10 minute furnace power is risen to more than 90%, furnace charge begins fusing, in melting, constantly adds by furnace charge steel scrap, after the metal charge that is disposed all melted, chemical composition analysis was carried out in sampling, adjusts the composition of each element according to analytical results, be warming up to 1400~1450 ℃ of temperature then, get final product.
Described stokehold treatment process is: adopt and to pour method with stream nucleating agent is added in the molten iron that the melting operation makes, carry out inoculation, the Vee formation test block method that disposes is carried out the stokehold and is observed, and is transported to cast-in-site after qualified.
Described nucleating agent is 75 silicon.
Continuous development along with modern industry, the supply of steel scrap is in continuous increase, particularly with in, soft steel is that the source of scrap stock of stamping parts of main raw is abundanter, the present invention is main raw material with the steel scrap, on price, compared remarkable advantages with the pig iron, and the content of impurity is low, and the impurity harmful element P in the steel scrap, S content all are far smaller than the requirement in the graphitic cast iron standard, only needs adjustment C, Si, Mn, N content wherein just can reach the requirement of graphitic cast iron.
In the charging process of the present invention, below carburelant promptly (furnace bottom place) with fritter melt down the gray iron shop fixtures, utilize the low melting point of gray iron to make carburelant under lower temperature, dissolve in molten iron; Use steel scrap the insulating covering agent compacting above the carburelant simultaneously, avoid carburelant directly to contact, prevent the scaling loss of carburelant with air.
The present invention is a main raw material with the steel scrap compared with prior art, and the adjusting by to the various elements in the steel scrap generates high-strength grey cast iron for automobile fittings, and with the foundry goods of its cast, having foundry goods, to produce bubble few, the characteristics that are difficult for cracking.
Embodiment:
Below in conjunction with embodiment the present invention is done detailed explanation.
The model of the steel scrap that the present invention is used is the common and qualitative carbon steel of 15#-45#.
Embodiment 1:
The production method of high-strength grey cast iron for automobile fittings comprises following operation: burden process, charging process, melting operation, stokehold treatment process,
In the described burden process: used furnace charge comprises steel scrap, melts down gray iron, manganeseirom (65 manganese), ferro-silicon (75Si), carbon content are coke foam, Quilonum Retard more than 85%, its weight ratio is steel scrap, foundry return, manganeseirom, ferro-silicon, coke foam, is respectively 80: 10: 0.5: 1.0: 3.5: 0.1.
In the described charging process, reinforced order is followed successively by and melts down gray iron, coke foam, manganeseirom, ferro-silicon, insulating covering agent iron filings, steel scrap, and the consumption of iron filings is advisable covering carburelant fully.
Described melting operation is: earlier with the small power blow-on, after 5 minutes furnace power is risen to 90%, furnace charge begins fusing, in melting, constantly adds by furnace charge steel scrap, after waiting that the furnace charge that is disposed all melts, chemical composition analysis is carried out in sampling, adjusts the composition of each element according to analytical results, be warming up to 1400~1450 ℃ of temperature then, get final product.
Described stokehold treatment process is: adopt and to pour method with stream nucleating agent 75 silicon are added in the molten iron that the melting operation makes, carry out inoculation, the Vee formation test block method that disposes is carried out the stokehold and is observed, and is transported to cast-in-site after qualified.
Embodiment 2:
The production method of high-strength grey cast iron for automobile fittings comprises following operation: burden process, charging process, melting operation, stokehold treatment process,
In the described burden process: used furnace charge comprises steel scrap, melts down gray iron, manganeseirom (65 manganese), ferro-silicon (75Si), carbon content are coke foam, Quilonum Retard more than 85%, and its weight ratio is steel scrap, foundry return, manganeseirom, ferro-silicon, coke foam=85: 15: 0.75: 1.6: 3.8: 0.3.
In the described charging process, reinforced order is followed successively by and melts down gray iron, coke foam, manganeseirom, ferro-silicon, insulating covering agent iron filings, steel scrap, and the consumption of iron filings is advisable covering carburelant fully.
Described melting operation is: earlier with the small power blow-on, after 8 minutes furnace power is risen to 90%, furnace charge begins fusing, in melting, constantly adds by furnace charge steel scrap, after waiting that the furnace charge that is disposed all melts, chemical composition analysis is carried out in sampling, adjusts the composition of each element according to analytical results, be warming up to 1400~1450 ℃ of temperature then, get final product.
Described stokehold treatment process is: adopt and to pour method with stream nucleating agent 75 silicon are added in the molten iron that the melting operation makes, carry out inoculation, the Vee formation test block method that disposes is carried out the stokehold and is observed, and is transported to cast-in-site after qualified.
Embodiment 3:
The production method of high-strength grey cast iron for automobile fittings comprises following operation: burden process, charging process, melting operation, stokehold treatment process,
In the described burden process: used furnace charge comprises steel scrap, melts down gray iron, manganeseirom (65 manganese), ferro-silicon (75Si), carbon content are coke foam, Quilonum Retard more than 85%, and its weight ratio is steel scrap, foundry return, manganeseirom, ferro-silicon, coke foam=90: 20: 1: 1.8: 4.5: 0.5.
In the described charging process, reinforced order is followed successively by and melts down gray iron, coke foam, manganeseirom, ferro-silicon, insulating covering agent iron filings, steel scrap, and the consumption of iron filings is advisable covering carburelant fully.
Described melting operation is: earlier with the small power blow-on, after 10 minutes furnace power is risen to 90%, furnace charge begins fusing, in melting, constantly adds by furnace charge steel scrap, after waiting that the furnace charge that is disposed all melts, chemical composition analysis is carried out in sampling, adjusts the composition of each element according to analytical results, be warming up to 1400~1450 ℃ of temperature then, get final product.
Described stokehold treatment process is: adopt and to pour method with stream nucleating agent 75 silicon are added in the molten iron that the melting operation makes, carry out inoculation, the Vee formation test block method that disposes is carried out the stokehold and is observed, and is transported to cast-in-site after qualified.
The chemical ingredients (weight percentage) of the graphitic cast iron that embodiment 2 is made: C:3.15, Si:1.6, Mn:0.71, P:0.71, S:0.05; Mechanical property: tensile strength: 265Mpa;
Metallurgical analysis: A type graphite quantity has a spot of C type graphite more than 90%; Perlite quantity is greater than 90%.Embodiment 2 made graphitic cast iron are used for the valve body cast, the physical dimension of valve body is 304 * 227 * 168, the thinnest 8mm of wall thickness, the thickest flange place is that the 21.5mm. wall thickness dimension is less than 25mm, the valve body that cast is good does not have shrinkage cavity, shrinkage porosite, pore, sand holes, slag blister phenomenon, and the 3.2Mpa water test 5 minutes, the ne-leakage phenomenon produced.

Claims (8)

1, the production method of high-strength grey cast iron for automobile fittings comprises following operation: burden process, charging process, melting operation, stokehold treatment process is characterized in that:
In the described burden process: used furnace charge comprises steel scrap, melts down gray iron, manganeseirom, ferro-silicon, carburelant, its weight ratio is steel scrap, foundry return, manganeseirom, ferro-silicon, carburelant, is respectively 80-90: 10-20: 0.5~1.0: 1.0~1.8: 3.5-4.0.
2, the production method of high-strength grey cast iron for automobile fittings according to claim 1 is characterized in that: in the described burden process: described manganeseirom is 65 manganese, and ferro-silicon is 75Si.
3, the production method of high-strength grey cast iron for automobile fittings according to claim 1 is characterized in that: in the described burden process: described carburelant is 85% above coke foam for the carbon containing percent by weight.
4, the production method of high-strength grey cast iron for automobile fittings according to claim 1 is characterized in that: in the described burden process: add in furnace charge and denitrogenate agent.
5, the production method of high-strength grey cast iron for automobile fittings according to claim 4 is characterized in that: in the described burden process: described to denitrogenate agent be Quilonum Retard, and the weight ratio of itself and steel scrap is 80-90: 0.1-0.5.
6, the production method of high-strength grey cast iron for automobile fittings according to claim 1 is characterized in that: in the described charging process, reinforced order is followed successively by and melts down gray iron, carburelant, manganeseirom, ferro-silicon, insulating covering agent, steel scrap.
7, the production method of high-strength grey cast iron for automobile fittings according to claim 1, it is characterized in that: described melting operation is: earlier with the small power blow-on, after 5-10 minute furnace power is risen to more than 90%, furnace charge begins fusing, constantly adds steel scrap in furnace charge melted, after the furnace charge that is disposed all melts, chemical composition analysis is carried out in sampling, adjust the composition of each element according to analytical results, be warming up to 1400~1450 ℃ of temperature then, get final product.
8, the production method of high-strength grey cast iron for automobile fittings according to claim 1, it is characterized in that: described stokehold treatment process is: adopt and to pour method with stream nucleating agent is added in the molten iron that the melting operation makes, carry out inoculation, the Vee formation test block method that disposes is carried out the stokehold and is observed, and is transported to cast-in-site after qualified.
CN200910116576A 2009-04-20 2009-04-20 Production method of high-strength grey cast iron for automobile fittings Pending CN101525677A (en)

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Application Number Priority Date Filing Date Title
CN200910116576A CN101525677A (en) 2009-04-20 2009-04-20 Production method of high-strength grey cast iron for automobile fittings

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101671753A (en) * 2009-10-09 2010-03-17 青特集团有限公司 Method for preparing gray cast iron
CN102534089A (en) * 2012-01-18 2012-07-04 邢台金后盾精密机械有限公司 Alloy cast iron rotor seat of twin-screw compressor
CN103484592A (en) * 2013-09-02 2014-01-01 遵义市红花岗区自强铸造有限责任公司 High-strength inoculated casting and manufacturing method thereof
CN104233047A (en) * 2014-08-29 2014-12-24 芜湖市金贸流体科技股份有限公司 Production method for producing high-strength pump body by using waste steel
CN106676385A (en) * 2016-12-16 2017-05-17 广西大学 Heat treatment method for alkali-resistant cast iron condenser
CN108220761A (en) * 2018-01-11 2018-06-29 芜湖市金贸流体科技股份有限公司 A kind of nanometer goes bad wear-resisting gray cast iron and casting method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101671753A (en) * 2009-10-09 2010-03-17 青特集团有限公司 Method for preparing gray cast iron
CN102534089A (en) * 2012-01-18 2012-07-04 邢台金后盾精密机械有限公司 Alloy cast iron rotor seat of twin-screw compressor
CN102534089B (en) * 2012-01-18 2013-04-24 邢台金后盾精密机械有限公司 Alloy cast iron rotor seat of twin-screw compressor
CN103484592A (en) * 2013-09-02 2014-01-01 遵义市红花岗区自强铸造有限责任公司 High-strength inoculated casting and manufacturing method thereof
CN103484592B (en) * 2013-09-02 2014-12-31 遵义市红花岗区自强铸造有限责任公司 High-strength inoculated casting and manufacturing method thereof
CN104233047A (en) * 2014-08-29 2014-12-24 芜湖市金贸流体科技股份有限公司 Production method for producing high-strength pump body by using waste steel
CN106676385A (en) * 2016-12-16 2017-05-17 广西大学 Heat treatment method for alkali-resistant cast iron condenser
CN108220761A (en) * 2018-01-11 2018-06-29 芜湖市金贸流体科技股份有限公司 A kind of nanometer goes bad wear-resisting gray cast iron and casting method

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