CN104043808A - Copper wire mesh composite high silicon iron base alloy plate electrode and manufacturing method thereof - Google Patents
Copper wire mesh composite high silicon iron base alloy plate electrode and manufacturing method thereof Download PDFInfo
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- CN104043808A CN104043808A CN201410279502.2A CN201410279502A CN104043808A CN 104043808 A CN104043808 A CN 104043808A CN 201410279502 A CN201410279502 A CN 201410279502A CN 104043808 A CN104043808 A CN 104043808A
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- base alloy
- high silicon
- copper mesh
- copper
- silicon iron
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Abstract
The invention discloses a copper wire mesh composite high silicon iron base alloy plate electrode and a manufacturing method thereof, and belongs to the field of corrosion resisting casting composite casting. The plate electrode chemically comprises, by weight, 1.0-1.2% of carbon, 16.5-20.0% of silicon, 0.3-0.8% of manganese, 0-0.03% of sulphur and phosphorus, 0.01-0.05% of RE, part of molten copper, and the balance Fe and other unavoidable impurities. The core part is a mesh woven by fine copper. The manufacturing method comprises the following steps that sand casting is adopted, smelting is carried out in an acidity electric induction furnace or an electric arc furnace, the rare earth ferrosilicon is added in a ladle before discharging, low-temperature pouring is adopted, the pouring temperature ranges from 1,250 DEG C to 1,280 DEG C, the high-temperature annealing technology is adopted, a casting is arranged in a furnace in a hot charging mode and is evenly heated into the temperature ranging from 750 DEG C to 800 DEG C, and when the temperature is kept for 48-72 hours, discharging is carried out after the furnace is cooled into the temperature below 150 DEG C. The copper wire mesh composite high silicon iron base alloy plate electrode is high in corrosion resistance and mechanical property and good in conductivity, and the requirement for manufacturing a cold-rolled stainless steel pickling tank is met.
Description
Technical field
The present invention relates to the good compound high silicon iron-base alloy battery lead plate of copper mesh and the manufacture method of adding, particularly, by using reinforcing mat, improved its mechanical property, belong to anti-corrosion foundry goods composite casting field.
Technical background
With industrial expansion, to can be more and more higher for being exposed to materials demand on the equipment of strong corrosive environment.High-silicon cast iron is exactly according to one of material of this demand exploitation.The Fe-Si-C casting alloy of the mass fraction of silicon between 10%～18% is called high-silicon cast iron.High-silicon cast iron is hard and crisp, and mechanical property is lower, but corrosive nature is good.It is a kind of casting alloy with good acid resistance, it has, and corrosion resistance is good, cost is low, production process is simple, save the advantages such as precious metal such as (nothing) nickel chromium triangle, is specially adapted to make the parts that contact with various strong corrosive mediums (as the nitric acid of various temperature and concentration, sulfuric acid, chromic acid, organic acid and a series of salting liquids) that bear dead load.High silicon Elverite part can be used for the required anti-corrosion foundry goods of industry such as chemical industry, oil, chemical fibre, metallurgy, national defence; also can be used for manufacturing the impressed current anode foundry goods that impressed current cathodic protection is used; be unsuitable for manufacturing and bear greater impact load, the parts of stress alternation or temperature jump.But high-silicon cast iron is because its inherent characteristic determines, exist again that intensity and impact flexibility are low, hardness is high, fragility is large, thermal conductivity factor is little and the shortcoming such as the coefficient of expansion is large.So that in the time of Foundry Production and application, be easy to produce shrinkage porosite, shrinkage cavity and defects i.e.cracks, can not stand violent variations in temperature and bear high pressure, machining is more difficult.Thereby the promotion and application of this material are limited to a certain extent.
The tissue of common high silicon iron-base alloy is mainly high silicon iron element body matrix and fine platy graphite, and is mainly Fe in high silicon iron element body
3si, this is a kind of fragility phase of superstructure mutually, it is the main cause that causes high silicon iron-base alloy poor mechanical property.The appearance and size of current cold rolled stainless steel sheet electrode plate for pickling tank is large (thick 2.5m, 0.4m, the 0.04m of reaching respectively of length and width), belongs to massive plate foundry goods, and the difficulty of cast form is larger, and monolithic molding mechanical property is poor.The impact flexibility of the common high silicon iron-base alloy battery lead plate nowadays using is about 0.9J/cm
2, the impact flexibility that contains the high silicon iron-base alloy of Cu4%-6% is about 1.5J/cm
2, the impact flexibility that adds the high silicon iron-base alloy of Re0.2% is about 1.4J/cm
2.In the time of handling, installation, especially in the time of the high silicon iron-base alloy battery lead plate of dismantling after losing efficacy, very easily there is the production accidents such as fracture in so low toughness.By increasing alloying element, to improve the space of high silicon iron-base alloy battery lead plate toughness very limited, and what therefore we proposed to have high tenacity adds the compound high silicon iron-base alloy battery lead plate of copper mesh.
Summary of the invention
The present invention seeks to appearance and size in order to solve cold rolled stainless steel sheet electrode plate for pickling tank difficulty large, cast form larger, and the poor problem of monolithic molding mechanical property.
One adds the compound high silicon iron-base alloy battery lead plate of copper mesh, puies forward heavy alloyed mechanical property, and main cause is to use to add copper mesh and improved the mechanical property of alloy, thereby has solved the shortcoming of high-silicon cast iron, and its application is had to great meaning.
One adds the compound high silicon iron-base alloy battery lead plate of copper mesh, it is characterized in that the copper mesh castingin that the method for cast form is formed the fine copper material of φ 12mm is in high silicon iron-base alloy, what formation was similar to reinforced concrete structure adds the compound high silicon iron-base alloy of copper mesh, the volume fraction of its fine copper is 10～15%, the volume fraction of high silicon iron-base alloy is 85～90%, adopts this compound high silicon iron-base alloy of copper mesh that adds to make acid-washing stainless steel battery lead plate and be and add the compound high silicon iron-base alloy battery lead plate of copper mesh.
The above-mentioned compound high silicon iron-base alloy battery lead plate of copper mesh that adds adopts mechanical weaving method that the pure copper wires of φ 12mm is woven into copper mesh, adopts this copper mesh as reinforcing mat, and the distance in copper mesh between every pure copper wires is 50mm.Copper mesh is embedded in the foam plastics mould of sand casting, melted liquid high silicon iron-base alloy is poured in the foamed plastics casting mold with copper mesh, foam plastics mould vaporization, the fusing of copper mesh surface part, melt portions is not retained in casting mold, and what after solidification forming, form a kind of structure that is similar to armored concrete adds the compound high silicon iron-base alloy battery lead plate of copper mesh.
In foaming patternmaking process, by the copper mesh fixed foam plastics apperance descaling in advance, copper mesh is positioned at center at battery lead plate thickness direction, equates apart from the distance of two sidewalls of die cavity.
The chemical composition mass percent that adds the compound high silicon iron-base alloy battery lead plate of copper mesh is: the brass of carbon 1.0～1.2%, silicon 16.5～20.0%, manganese 0.3～0.8%, sulphur, phosphorus <0.03%, RE:0.01～0.05%, partial melting, all the other compositions for Fe and inevitable impurity; Reinforcing mat does with copper mesh in heart portion.
The manufacture method that adds the compound high silicon iron-base alloy battery lead plate of copper mesh provided by the invention is: alloy melting: pure iron, ferrosilicon are added and in electric induction furnace or electric arc furnaces, carry out melting, various materials are fully mixed, and in fusion process, add acid slag former, after aluminium alloy fusing after sufficient standing, remove gas and field trash in aluminium alloy, the smelting temperature of alloy is 1480-1520 DEG C; Tapping temperature is 1420-1460 DEG C; Copper mesh is fixed in casting mold to castable in the time of molten iron temperature to 1280～1320 DEG C; Adopt the enclosed running gate system of unhurried current, the ratio of the cross-sectional area of sprue, cross gate and ingate constituent element is: A
directly: A
horizontal: A
in=1.1～1.3:1.5～1.7:1.0 (A
directly, A
horizontaland A
inrespectively the sectional area of sprue, cross gate and ingate); Heat treatment: carry out hot shake-out in 6～12 minutes after casting solidification is shaped, the foundry goods of red heat is carried out to annealing in process immediately, foundry goods hot charging enters stove, homogeneous heating to 750～800 DEG C, are incubated 48～72 hours stoves and are as cold as 150 DEG C and come out of the stove below.
The reason of the numerical definiteness to alloy composition of the present invention is described in detail below.
(1) silicon (Si): 16.5～20.0% (weight)
In the time that the weight ratio of silicon reaches 14.5%, under suitable ambient condition, its surface can form the diaphragm of one deck densification, and film is mainly made up of silica.At this moment corrosion resistance sharply rises, when silicon content is lower than 14.5% time, and the control of the oxidated iron film of corrosion resistance; Silicon content is higher than 14.6% time, and corrosion resistance is subject to silicon dioxide film control.Therefore in cast iron, must contain and be not less than 14.5% silicon and just there is good corrosion resistance.Corrosion resisting property improves with the increase of silicon content, but too high silicon content can generate the stable fragility phase (Fe that is situated between
5si
2), make material more crisp, the highest silicon content can reach 18% for this reason.But in order to obtain good corrosion resistance, do not make again its mechanical performance too poor, the content of high silicon is anti-corrosion ferrous alloy Si is selected in 16.5%～20.0%.
(2) carbon (C): 1.0～1.2% (weight)
Silicone content in high silicon is anti-corrosion ferrous alloy is higher, and phosphorus content should be lower.More rational phosphorus content should be equivalent to hypoeutectic composition or the eutectic composition of the anti-corrosion ferrous alloy of this high silicon.If when phosphorus content substantially exceeds eutectic composition, can separate out thick graphite, cause serious tissue looseness.This is because the solvability of Si in alpha ferrite is stronger than C, and Si has accelerated again the diffusion of C, therefore C is just squeezed out by Si and the flake graphite of formation free state, along with the carbon containing of alloy increases, the size of the flake graphite of separating out increases, quantity increases, and will form more cavity and form more micro cell, and being unfavorable for its mechanical performance and corrosion resistance.So the C content of the anti-corrosion ferrous alloy of high silicon is selected in 1.0～1.2%.
(3) manganese (Mn): 0.3～0.8% (weight)
Manganese is a kind of element that expands austenitic area in ferrous alloy, and silicon is the element that dwindles austenitic area, a small amount of manganese will be solid-solubilized in alpha ferrite in high silicon iron-base alloy, the corrosion resistance of alloy and mechanical performance impact are not obvious, but too high manganese produces adverse influence to the performance of high silicon iron-base alloy, because manganese is larger at Solidification Segregation coefficient, as easy as rolling off a log enrichment between dendrite, make the inhomogeneous of component distributing, cause the electrode potential of local microcell to have certain difference, even form micro cell effect, low-alloyed corrosion resistance is fallen, therefore Mn should select between 0.3%～0.8%.
(4) phosphorus (P) <0.03% (weight)
The content of P will have influence on the heat resistance of high silicon corrosion resistant alloy, and its content of General Requirements is below 0.03%.
(5) sulphur (S) <0.03% (weight)
The content of S increases corrosion resistance and the mechanical performance that can reduce high silicon corrosion resistant alloy, because the vivacity of S significantly improves with the increase of Si in molten iron.So the content of S should be strict controlled in below 0.03%.
(6) copper (Cu)
Copper can improve the mechanical property of high-silicon cast iron, improves intensity and toughness, reduces hardness.Containing Cu High Silicon Cast Iron can be carried out car, plane, boring, the processing of line silk.Copper can improve common high-silicon cast iron and drink corrosion resistance in hot sulfuric acid.Except corrosion resistance in the nitric acid of 45% concentration is slightly poor, in other medium, all there is good corrosion resistance containing Cu6.5%～8.5% high-silicon cast iron.In the sulfuric acid of the various concentration of 80 DEG C, all have high corrosion resistance containing the high-silicon cast iron of Cu8%～10%, rate of corrosion is all less than 0.3mm/, and it can be used to manufacture the chemical machinery part of the hot sulfuric acid for contacting various concentration.Copper after the fusing of copper mesh surface part will incorporate in high-silicon cast iron matrix.
Chemical composition and the manufacturing process that adds the compound high silicon iron-base alloy battery lead plate of copper mesh of the present invention, compared with existing high-silicon cast iron, not only there is high corrosion resistance, and have high mechanical performance (especially toughness) and good electric conductivity, meet the cold rolled stainless steel sheet electrode plate for pickling tank of large (maximum length is 3m) of manufactured size completely.
Brief description of the drawings
Accompanying drawing 1: add copper net electrode plate copper mesh schematic diagram
Accompanying drawing 2: add copper net electrode plate structure schematic diagram, in figure: 6-high silicon corrosion resistant alloy; 8-copper mesh
Accompanying drawing 3: cast schematic diagram, in figure: 1-cast gate; 2-sprue; 3-Polypropylence Sheet; 4-cross gate; 5-rising head; 6-high silicon corrosion resistant alloy; 7-bleeding point; 8-copper mesh; 9-ingate
Detailed description of the invention
Below cold rolled stainless steel sheet pickling tube in the present invention is described in detail by the manufacturing process that adds the compound high silicon iron-base alloy battery lead plate of copper mesh:
The production technology that adds the compound high silicon iron-base alloy battery lead plate of copper mesh comprises several operations such as making, alloy melting, Design of Runner System, moulding, cast and the heat treatment of reinforcing mat.
(1) making of reinforcing mat and rust cleaning
It is for subsequent use that reinforcing mat is woven into copper mesh with the pure copper wires of φ 12mm.
(2) melting of alloy
High silicon iron-base alloy can adopt electric induction furnace or arc melting, adopts acid lining, and the raw material of molten alloy have: pure iron, and 75 ferrosilicon, foundry returns etc., require raw material drying to become rusty less.Adopt the method for twice melting, the object of melting is for the first time batch mixing, by melt-blended all raw material even, pour into ingot for subsequent use, charging sequence when melting is followed successively by: pure iron, foundry returns, ferrosilicon etc., in fusion process, add acid slag former, reduce the scaling loss of element in alloy melting process; Melting object is for the second time degassed slagging-off, obtains the aluminium alloy of high-quality, meets the requirement of cast electrode plate, when melting, adopt aforesaid ingot, in fusion process, add acid slag former, after 1450～1480 DEG C of fusings, after leaving standstill 40 minutes, can come out of the stove, tapping temperature is 1400～1420 DEG C.
(3) rotten processing
The rotten object of processing is crystal grain thinning and purifies alloy, rotten processing adopts rare earth ferrosilicon alloy as alterant, adopt the method for ladle mesometamorphism processing, at the bottom of alterant being added to the bag of ladle before coming out of the stove, addition is to process the 0.2-1.0% of weight of molten iron.
(4) Design of Runner System
Design of Runner System is the important content of casting Technology Design, it is the important step that is related to casting quality, in order to strengthen the slag effect of suppressing of running gate system, adopt the enclosed running gate system of unhurried current, the ratio of the cross-sectional area of sprue, cross gate and ingate constituent element is: A
directly: A
horizontal: A
in=1.1～1.3:1.5～1.7:1.0 (A
directly, A
horizontaland A
inrespectively the sectional area of sprue, cross gate and ingate); In order further to strengthen the slag effect of suppressing of running gate system, on the cross gate constituent element of running gate system, add a fibrous filter net.
(5) moulding
In order to strengthen collapsibility and the deformability of casting mold, reduce casting stress, prevent that casting process from cracking, ensure the surface quality of foundry goods, adopt phenolic sand molding.Reinforcing mat is fixed in casting mold simultaneously.
(6) cast
The pouring technology that adopts low temperature to water soon, pouring temperature is 1250～1280 DEG C, and too high temperature will cause a large amount of shrinkage porosites, and too low pouring temperature can produce the casting flaw of misrun.
(7) heat treatment
The result of existing experiment draws, adding the compound high silicon iron-base alloy battery lead plate of copper mesh must annealed heat treatment, and this is not only conducive to put forward heavy alloyed mechanical property, and can ensure coolingly slowly, eliminates thermal stress.After casting solidification is shaped, carry out hot shake-out in 6～12 minutes, the foundry goods of red heat is carried out to annealing in process immediately, foundry goods hot charging enters stove, and homogeneous heating to 750～800 DEG C are incubated 48～72 hours stoves and are as cold as 150 DEG C and come out of the stove below.
Claims (7)
1. one kind adds the compound high silicon iron-base alloy battery lead plate of copper mesh, it is characterized in that the copper mesh castingin that the method for cast form is woven into the pure copper wires of φ 12mm is in high silicon iron-base alloy, formation is similar to the compound high silicon iron-base alloy of copper mesh of reinforced concrete structure, the volume fraction of its fine copper is 10～15%, the volume fraction of high silicon iron-base alloy is 85～90%, adopts this compound high silicon iron-base alloy of copper mesh that adds to make acid-washing stainless steel battery lead plate and be and add the compound high silicon iron-base alloy battery lead plate of copper mesh.
2. according to the compound high silicon iron-base alloy battery lead plate of copper mesh that adds claimed in claim 1, it is characterized in that adopting weaving method that the pure copper wires of φ 12mm is made into copper mesh, adopt this copper mesh as reinforcing mat, the distance in copper mesh between every pure copper wires is 50mm.
3. according to the compound high silicon iron-base alloy battery lead plate of copper mesh that adds claimed in claim 2, it is characterized in that copper mesh to be embedded in casting mold die cavity, melted liquid high silicon iron-base alloy is poured in the casting mold with steel copper mesh, the pure copper wires surface local fusing of φ 12mm, realize good metallurgical binding, but major part is still retained in casting mold, what after solidification forming, form a kind of structure that is similar to armored concrete adds the compound high silicon iron-base alloy battery lead plate of pure copper wires net.
4. according to the compound high silicon iron-base alloy battery lead plate of copper mesh that adds claimed in claim 1, it is characterized in that in foaming patternmaking process, by in the fine copper net fixed foam plastics apperance of establishment, fine copper net is positioned at center at battery lead plate thickness direction, equates apart from the distance of two sidewalls of die cavity.
5. according to adding the compound high silicon iron-base alloy battery lead plate of copper mesh described in claim 1--4, it is characterized in that adding the compound high silicon iron-base alloy battery lead plate of copper mesh chemical component weight percentage is: carbon 1.0～1.2%, silicon 16.5～20.0%, manganese 0.3～0.8%, sulphur <0.03%, phosphorus <0.03%, rare earth: 0.01～0.05%, the copper of partial melting, all the other are Fe and inevitable compositions of impurity; Reinforcing mat does with copper in heart portion.
6. according to the preparation method who adds the compound high silicon iron-base alloy battery lead plate of copper mesh claimed in claim 5, it is characterized in that, adopt steel scrap, ferrosilicon, rare earth configuration alloy raw material, join and in acid electric induction furnace or electric arc furnaces, carry out melting, 1450～1480 DEG C of smelting temperatures, in fusion process, add acid slag former, the processing of going bad in ladle, after molten alloy, at the bottom of molten iron handbag, add rare earth ferrosilicon alloy, rare earth ferrosilicon alloy addition is to process 0.2～1.0% of weight of molten iron, melted molten iron is poured in ladle and reacted with rare earth ferrosilicon alloy, tapping temperature is 1400-1420 DEG C, after coming out of the stove, leave standstill the sufficiently long time, remove after the gas and field trash in aluminium alloy, castable in the time of molten iron temperature to 1250～1280 DEG C.
7. according to the preparation method who adds the compound high silicon iron-base alloy battery lead plate of copper mesh claimed in claim 6, it is characterized in that, adopt resin bonded sand mould, copper mesh is fixed in casting mold, castable in the time of molten iron temperature to 1250～1280 DEG C; Adopt the enclosed running gate system of unhurried current, the ratio of the cross-sectional area of sprue, cross gate and ingate constituent element is: A
directly: A
horizontal: A
in=1.1～1.3:1.5～1.7:1.0, A
directly, A
horizontaland A
init is respectively the sectional area of sprue, cross gate and ingate.
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| CN201410279502.2A CN104043808B (en) | 2014-06-20 | 2014-06-20 | One adds copper mesh compound high silicon iron-base alloy battery lead plate and manufacture method thereof |
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Cited By (1)
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| CN110042302A (en) * | 2019-04-03 | 2019-07-23 | 北京科技大学 | A kind of anti-corrosion Ultra-low carbon high silicon iron-base alloy and preparation method thereof |
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