CN104195412B - High-strength gray cast iron, foundry goods and preparation method thereof - Google Patents

High-strength gray cast iron, foundry goods and preparation method thereof Download PDF

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CN104195412B
CN104195412B CN201410401741.0A CN201410401741A CN104195412B CN 104195412 B CN104195412 B CN 104195412B CN 201410401741 A CN201410401741 A CN 201410401741A CN 104195412 B CN104195412 B CN 104195412B
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weight
iron
gray cast
cast iron
strength gray
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CN104195412A (en
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俞家华
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WUHU GUODING MACHINERY MANUFACTURING Co Ltd
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WUHU GUODING MACHINERY MANUFACTURING Co Ltd
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Abstract

The invention discloses a kind of high-strength gray cast iron, foundry goods and preparation method thereof, this preparation method includes: the 1) operation pig iron, steel scrap, foundry returns and titanium preheated at 1,200 1300 DEG C;2) raw material after preheating is melted the operation with prepared molten iron at 1,460 1470 DEG C;3) ferrosilicon, silico-calcium inovulant, silicon strontium inovulant are added to described molten iron and stir to prepare the operation breeding molten iron;4) breed in molten iron described in high carbon ferromanganese being added at 1,490 1510 DEG C extremely and stir with the operation of prepared high-strength gray cast iron.The foundry goods being prepared from by this high-strength gray cast iron has the mechanical performance of excellence.

Description

High-strength gray cast iron, foundry goods and preparation method thereof
Technical field
The present invention relates to high-strength gray cast iron field, in particular it relates to a kind of high-strength gray cast iron, foundry goods And the preparation method of this high-strength gray cast iron.
Background technology
Pump case, container, tower, flange, stuffing box body and gland, carbonators, bed piece, vertical Post, cylinder, gear and nitrification tower etc. produce raw material and are casting pig, due to the tension of existing ash foundry goods There is higher scrappage when machine-shaping in the highest foundry goods that often leads to of intensity, greatly increases production Cost.
Summary of the invention
It is an object of the invention to provide a kind of high-strength gray cast iron and its preparation method, this high intensity ash cast The foundry goods that ferrum is prepared from has the mechanical performance of excellence.
To achieve these goals, the invention provides the preparation method of a kind of high-strength gray cast iron, described Preparation method includes:
1) operation that the pig iron, steel scrap, foundry returns and titanium are preheated at 1200-1300 DEG C;
2) raw material after preheating is melted the operation with prepared molten iron at 1460-1470 DEG C;
3) ferrosilicon, silico-calcium inovulant, silicon strontium inovulant are added to described molten iron and stir to prepare Breed the operation of molten iron;
4) breed in molten iron described in high carbon ferromanganese being added at 1490-1510 DEG C extremely and stir with prepared height The operation of strength gray cast iron.
Present invention also offers a kind of high-strength gray cast iron, described high-strength gray cast iron is above-mentioned method system For forming.
Present invention also offers a kind of foundry goods, described foundry goods is formed by above-mentioned high-strength gray cast iron casting.
The high-strength gray cast iron that the present invention provides has tensile strength and the hardness of excellence, so that by this The foundry goods that high-strength gray cast iron is prepared from can be as all kinds of high intensity, HI high impact machine tool.Simultaneously The preparation method of this high-strength gray cast iron is simple, and raw material is easy to get.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
Present invention also offers the preparation method of a kind of high-strength gray cast iron, described preparation method includes:
1) operation that the pig iron, steel scrap, foundry returns and titanium are preheated at 1200-1300 DEG C;
2) raw material after preheating is melted the operation with prepared molten iron at 1460-1470 DEG C;
3) ferrosilicon, silico-calcium inovulant, silicon strontium inovulant are added to described molten iron and stir to prepare Breed the operation of molten iron;
4) breed in molten iron described in high carbon ferromanganese being added at 1490-1510 DEG C extremely and stir with prepared height The operation of strength gray cast iron.
In the present invention, the consumption of each raw material is carved characters, and wide scope is interior to be selected, so that prepare high intensity Casting pig has more excellent mechanical performance, it is preferable that wherein, relative to the pig iron of 100 weight portions, The consumption of described steel scrap is 60-75 weight portion, and the consumption of described foundry returns is 100-120 weight portion, institute The consumption stating ferrosilicon is 2-5 weight portion, and the consumption of described silico-calcium inovulant is 0.5-1.5 weight portion, described The consumption of silicon strontium inovulant is 0.5-0.9 weight portion, and the consumption of described high carbon ferromanganese is 1-3 weight portion, institute The consumption stating titanium is 1-1.5 weight portion.
In the present invention, the described pig iron can select in wide scope, can be the trade mark be Z18, Z14 or The pig iron of Z22, so that prepare high-strength gray cast iron have more excellent mechanical performance, it is preferable that The described pig iron be the trade mark be the pig iron of Z18.
In the present invention, described steel scrap can be arbitrary discarded steel, so that prepare the casting of high intensity ash Ferrum has more excellent mechanical performance, it is preferable that for the steel scrap of 100 weight portions, contain in described steel scrap There are the carbon of 0.2-0.4 weight portion, the manganese element of 0.1-0.4 weight portion, the phosphorus of 0.01-0.02 weight portion Element, the ferrum element of surplus and inevitable trace element.
In the present invention, described steel scrap can be arbitrary foundry returns, so that prepare high-strength gray cast iron There is more excellent mechanical performance, it is preferable that relative to the foundry returns of 100 weight portions, described foundry returns In containing the carbon of 3.6-3.8 weight portion, the element silicon of 2.3-2.8 weight portion, 0.05-0.1 weight portion Manganese element, the element sulphur of 0.01-0.03 weight portion, the P elements of 0.01-0.03 weight portion, the ferrum unit of surplus Element and inevitably trace element.
In the present invention, ferrosilicon is well-known to those skilled in the art for stoping formation carbonization in ferrum Thing, the precipitation promoting graphite and the auxiliary agent of nodularization, ferrosilicon can be commercially available any one, so that Prepared high-strength gray cast iron has more excellent mechanical performance, it is preferable that described ferrosilicon is that the trade mark is The ferrosilicon of FeSi90Al1.5 or FeSi90Al3.
In the present invention, high carbon ferromanganese is well-known to those skilled in the art for promoting in spheroidal graphite cast-iron The additive of graphite crystallization globulate, ferrosilicon can be commercially available any one, so that prepare high-strength Degree casting pig there is more excellent mechanical performance, it is preferable that described high carbon ferromanganese be the trade mark be 65 or 75 High carbon ferromanganese.
Present invention also offers a kind of high-strength gray cast iron, described high-strength gray cast iron is by above-mentioned method It is prepared from.
Present invention also offers a kind of foundry goods, described foundry goods is formed by above-mentioned high-strength gray cast iron casting.
Hereinafter will be described the present invention by embodiment.In following example, tensile strength is joined Number is recorded by the method for GB 9439-2010.
The pig iron be the Hangzhou Ji Hui metal material company limited trade mark be the commercially available product of Z18, steel scrap is Liaocheng City The product of Dechang Steel Tube Co., ltd, foundry returns is the product of source, Junan County sky steel strontium products factory, carburant Being the coke of Jiyuan City Ao Xin trade Co., Ltd, ferrosilicon is that Anyang China opens up the metallurgical Co., Ltd trade mark For the product of FeSi90Al1.5 or FeSi90Al3, it is limited that silico-calcium inovulant is that resistance to material sent out metallurgical by Anyang ferrum The product of company, silicon strontium inovulant is the product of Changzhou Run Liang ferroalloy company limited, and high carbon ferromanganese is Xiang Tan Wei Xinmeng Products Co., Ltd trade mark is the product of 65, and titanium is the Southern Pass, the Shanghai limited public affairs of metallic article Department.
Embodiment 1
First by pig iron 100kg, steel scrap 70kg, foundry returns 110kg and titanium 1.3kg that the trade mark is Z18 30min is preheated at 1250 DEG C;Then the raw material after preheating is melted with prepared molten iron at 1465 DEG C; Then by ferrosilicon 0.4kg that the trade mark is FeSi90Al1.5, silico-calcium inovulant 0.9kg, silicon strontium inovulant 0.7kg Add to described molten iron and stir and breed molten iron to prepare;It is finally the high carbon ferromanganese of 65 by the trade mark 1.5kg add at 1500 DEG C to described in breed in molten iron and stir with prepared high-strength gray cast iron.
Wherein, in described steel scrap containing the carbon of 0.3 weight %, the manganese element of 0.3 weight %, 0.01 The P elements of weight %, the ferrum element of surplus and inevitable trace element;Described foundry returns contains There are the carbon of 3.7 weight %, the element silicon of 2.5 weight %, the manganese element of 0.07 weight %, 0.02 weight The amount element sulphur of %, the P elements of 0.02 weight %, the ferrum element of surplus and inevitable trace unit Element.The particle diameter of coke is 0.4mm.
The tensile strength of this high-strength gray cast iron is 215MPa.
Embodiment 2
First pig iron 100kg, steel scrap 60kg, foundry returns 100kg and titanium 1kg that the trade mark is Z18 are existed 30min is preheated at 1250 DEG C;Then the raw material after preheating is melted with prepared molten iron at 1460 DEG C;So After by ferrosilicon 0.2kg that the trade mark is FeSi90Al1.5, silico-calcium inovulant 0.5kg, silicon strontium inovulant 0.5kg Add to described molten iron and stir and breed molten iron to prepare;Finally by high carbon ferromanganese 1kg that the trade mark is 65 Breed in molten iron described in adding at 1490 DEG C extremely and stir with prepared high-strength gray cast iron.
Wherein, in described steel scrap containing the carbon of 0.3 weight %, the manganese element of 0.3 weight %, 0.01 The P elements of weight %, the ferrum element of surplus and inevitable trace element;Described foundry returns contains There are the carbon of 3.7 weight %, the element silicon of 2.5 weight %, the manganese element of 0.07 weight %, 0.02 weight The amount element sulphur of %, the P elements of 0.02 weight %, the ferrum element of surplus and inevitable trace unit Element.The particle diameter of coke is 0.4mm.
The tensile strength of this high-strength gray cast iron is 210MPa.
Embodiment 3
First by pig iron 100kg, steel scrap 75kg, foundry returns 120kg and titanium 1.5kg that the trade mark is Z18 30min is preheated at 1250 DEG C;Then the raw material after preheating is melted with prepared molten iron at 1470 DEG C; Then by ferrosilicon 0.6kg that the trade mark is FeSi90Al1.5, silico-calcium inovulant 1.5kg, silicon strontium inovulant 0.9kg Add to described molten iron and stir and breed molten iron to prepare;It is finally the high carbon ferromanganese of 65 by the trade mark 1.5kg add at 1510 DEG C to described in breed in molten iron and stir with prepared high-strength gray cast iron.
Wherein, in described steel scrap containing the carbon of 0.3 weight %, the manganese element of 0.3 weight %, 0.01 The P elements of weight %, the ferrum element of surplus and inevitable trace element;Described foundry returns contains There are the carbon of 3.7 weight %, the element silicon of 2.5 weight %, the manganese element of 0.07 weight %, 0.02 weight The amount element sulphur of %, the P elements of 0.02 weight %, the ferrum element of surplus and inevitable trace unit Element.The particle diameter of coke is 0.4mm.
The tensile strength of this high-strength gray cast iron is 210MPa.
Embodiment 4
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, the most described steel scrap contains The carbon of 0.2 weight %, the manganese element of 0.1 weight %, the P elements of 0.01 weight %, the ferrum of surplus Element and inevitably trace element.
The tensile strength of this high-strength gray cast iron is 209MPa.
Embodiment 5
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, the most described steel scrap contains The carbon of 0.4 weight %, the manganese element of 0.4 weight %, the P elements of 0.02 weight %, the ferrum of surplus Element and inevitably trace element.
The tensile strength of this high-strength gray cast iron is 212MPa.
Embodiment 6
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, the most described foundry returns contains There are the carbon of 3.6 weight %, the element silicon of 2.3 weight %, the manganese element of 0.05 weight %, 0.01 weight The amount element sulphur of %, the P elements of 0.01 weight %, the ferrum element of surplus and inevitable trace unit Element.
The tensile strength of this high-strength gray cast iron is 213MPa.
Embodiment 7
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, the most described foundry returns contains There are the carbon of 3.8 weight %, the element silicon of 2.8 weight %, the manganese element of 0.1 weight %, 0.03 weight The element sulphur of %, the P elements of 0.03 weight %, the ferrum element of surplus and inevitable trace element.
The tensile strength of this high-strength gray cast iron is 211MPa.
Embodiment 8
Carrying out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that the particle diameter of coke is 0.15mm。
The tensile strength of this high-strength gray cast iron is 208MPa.
Embodiment 9
Carrying out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that the particle diameter of coke is 0.6mm。
The tensile strength of this high-strength gray cast iron is 205MPa.
Comparative example 1
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that do not contain silico-calcium and breed Agent.
The tensile strength of this high-strength gray cast iron is 187MPa.
Comparative example 2
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that do not contain silicon strontium and breed Agent.
The tensile strength of this high-strength gray cast iron is 195MPa.
Comparative example 3
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that prepare and breed molten iron The temperature of operation is 1440 DEG C.
The tensile strength of this high-strength gray cast iron is 183MPa.
Comparative example 4
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that breed the operation of molten iron Temperature be 1480 DEG C.
The tensile strength of this high-strength gray cast iron is 177MPa.
Comparative example 5
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that prepare the casting of high intensity ash The temperature of the operation of ferrum is 1485 DEG C.
The tensile strength of this high-strength gray cast iron is 175MPa.
Comparative example 6
Carry out preparing high-strength gray cast iron according to the method for embodiment 1, except for the difference that prepare the casting of high intensity ash The temperature of the operation of ferrum is 1530 DEG C.
The tensile strength of this high-strength gray cast iron is 179MPa.
By above-described embodiment and comparative example, the high-strength gray cast iron that the present invention provides has excellence Tensile strength, thus make it have the mechanical performance of excellence.The present invention's described in detail above is preferred real Execute mode, but, the present invention is not limited to the detail in above-mentioned embodiment, in the skill of the present invention In art concept, technical scheme can be carried out multiple simple variant, these simple variant Belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (8)

1. the preparation method of a high-strength gray cast iron, it is characterised in that described preparation method is by following Step forms:
1) operation that the pig iron, steel scrap, foundry returns and titanium are preheated at 1200-1300 DEG C;
2) raw material after preheating is melted the operation with prepared molten iron at 1460-1470 DEG C;
3) ferrosilicon, silico-calcium inovulant, silicon strontium inovulant are added to described molten iron and stir to prepare Breed the operation of molten iron;
4) breed in molten iron described in high carbon ferromanganese being added at 1490-1510 DEG C extremely and stir with prepared height The operation of strength gray cast iron;
Wherein, relative to the pig iron of 100 weight portions, the consumption of described steel scrap is 60-75 weight portion, institute The consumption stating foundry returns is 100-120 weight portion, and the consumption of described ferrosilicon is 2-5 weight portion, described silicon The consumption of calcium inovulant is 0.5-1.5 weight portion, and the consumption of described silicon strontium inovulant is 0.5-0.9 weight portion, The consumption of described high carbon ferromanganese is 1-3 weight portion, and the consumption of described titanium is 1-1.5 weight portion.
Preparation method the most according to claim 1, wherein, the described pig iron be the trade mark be Z18's The pig iron.
Preparation method the most according to claim 1 and 2, wherein, relative to 100 weight portions Steel scrap, in described steel scrap containing the carbon of 0.2-0.4 weight portion, the manganese element of 0.1-0.4 weight portion, The P elements of 0.01-0.02 weight portion, surplus are ferrum element and inevitable trace element.
Preparation method the most according to claim 1 and 2, wherein, relative to 100 weight portions Foundry returns, containing the carbon of 3.6-3.8 weight portion, the silicon unit of 2.3-2.8 weight portion in described foundry returns Element, the manganese element of 0.05-0.1 weight portion, the element sulphur of 0.01-0.03 weight portion, 0.01-0.03 weight portion P elements, surplus be ferrum element and inevitable trace element.
Preparation method the most according to claim 1 and 2, wherein, described ferrosilicon is that the trade mark is The ferrosilicon of FeSi90Al1.5 or FeSi90Al3.
Preparation method the most according to claim 1 and 2, wherein, described high carbon ferromanganese is the trade mark It it is the high carbon ferromanganese of 65.
7. a high-strength gray cast iron, it is characterised in that described high-strength gray cast iron is to be wanted by right The method described in any one in 1-6 is asked to be prepared from.
8. a foundry goods, it is characterised in that described foundry goods is cast by the high intensity ash described in claim 7 Iron casting forms.
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CN104561737A (en) * 2014-12-29 2015-04-29 芜湖国鼎机械制造有限公司 Anti-tensile gray cast iron, casting and preparation method of anti-tensile gray cast iron
CN104561736A (en) * 2014-12-29 2015-04-29 芜湖国鼎机械制造有限公司 High-strength gray cast iron, casting and preparation method of high-strength gray cast iron
CN105033663A (en) * 2015-06-12 2015-11-11 江苏塞维斯数控科技有限公司 Working table of numerical-control engraving and milling machine
CN105033661A (en) * 2015-06-12 2015-11-11 江苏塞维斯数控科技有限公司 CNC (Computer Numerical Control) engraving and milling machine base
CN105648305B (en) * 2016-04-18 2017-12-01 宝鸡市晨瑞鑫铸造有限责任公司 High-strength gray cast iron material and preparation method thereof

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CN102230124A (en) * 2011-06-16 2011-11-02 芜湖市金贸流体科技股份有限公司 Anti-wearing heat-resisting cast iron and preparation method thereof
CN102634723B (en) * 2012-05-11 2014-01-08 郑州机械研究所 Ferrite ductile iron used at low temperature and manufacturing method thereof
CN102935505B (en) * 2012-11-01 2015-03-18 中原利达铁路轨道技术发展有限公司 Casting method of low temperature resistant iron cushion plate for high speed railway buckling part
CN103361540B (en) * 2013-07-05 2015-12-23 南车戚墅堰机车车辆工艺研究所有限公司 Low-alloy high-strength gray cast iron and preparation method thereof
CN103882279B (en) * 2014-03-31 2015-11-18 江苏力源金河铸造有限公司 A kind of melting method of high-strength gray cast iron part

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