CN104043808B - One adds copper mesh compound high silicon iron-base alloy battery lead plate and manufacture method thereof - Google Patents
One adds copper mesh compound high silicon iron-base alloy battery lead plate and manufacture method thereof Download PDFInfo
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- CN104043808B CN104043808B CN201410279502.2A CN201410279502A CN104043808B CN 104043808 B CN104043808 B CN 104043808B CN 201410279502 A CN201410279502 A CN 201410279502A CN 104043808 B CN104043808 B CN 104043808B
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Abstract
One adds copper mesh compound high silicon iron-base alloy battery lead plate and manufacture method thereof, belongs to the field of anti-corrosion foundry goods composite casting.The chemical composition mass percent of battery lead plate is: carbon: 1.0 ~ 1.2%, silicon: 16.5 ~ 20.0%, manganese: 0.3 ~ 0.8%, sulphur, phosphorus & lt; 0.03%, RE:0.01 ~ 0.05%, partial melting copper, all the other are the composition of Fe and inevitable impurity; The net that heart portion fine copper is woven into.Manufacture method is as follows: adopt sand casting, melting is carried out in acid electric induction furnace or electric arc furnaces, in ladle, rare earth ferrosilicon alloy is added before coming out of the stove, adopt cast cold, pouring temperature is 1250 ~ 1280 DEG C, after cast, adopt high-temperature annealing process, foundry goods hot charging enters stove, is uniformly heated to 750 ~ 800 DEG C, is incubated 48 ~ 72 hours stoves and is as cold as less than 150 DEG C and comes out of the stove.Add that copper mesh compound high silicon iron-base alloy battery lead plate corrosion resistance is high, mechanical property is high, good conductivity, meets the making requirement of cold rolled stainless steel sheet pickling tube.
Description
Technical field
The present invention relates to and excellent add copper mesh compound high silicon iron-base alloy battery lead plate and manufacture method, particularly by using reinforcing mat, improving its mechanical property, belonging to anti-corrosion foundry goods composite casting field.
Technical background
With industrial expansion, more and more higher to the materials demand that may be used for being exposed on the equipment of strong corrosive environment.High-silicon cast iron is exactly according to one of material of this requirement developing.The Fe-Si-C casting alloy of mass fraction between 10% ~ 18% of silicon 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 superior acid resistance energy, 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 contacted with various strong corrosive medium (as the nitric acid of various temperature and concentration, sulfuric acid, chromic acid, organic acid and a series of salting liquid) bearing dead load.High silicon Elverite part can be used for the anti-corrosion foundry goods needed for industry such as chemical industry, oil, chemical fibre, metallurgy, national defence; also can be used for the impressed current anode foundry goods manufacturing impressed current cathodic protection; be unsuitable for manufacture and bear greater impact load, the parts of stress alternation or temperature jump.But high-silicon cast iron determined due to its inherent characteristic, there is again intensity and the shortcoming such as impact flexibility is low, hardness is high, fragility is large, thermal conductivity factor is little and the coefficient of expansion is large.So that when Foundry Production and application, be easy to produce the defects such as shrinkage porosite, shrinkage cavity and crackle, can not stand violent variations in temperature and bear high pressure, machining is more difficult.Thus limit the promotion and application of this material to a certain extent.
Common high silicon iron-base alloy organize mainly high silicon iron ferritic matrix and fine platy graphite, and mainly Fe in high silicon iron ferritic
3si, this is a kind of brittlement phase of superstructure mutually, and it is the main cause causing high silicon iron-base alloy poor mechanical property.The appearance and size comparatively large (length and width are thick reaches 2.5m, 0.4m, 0.04m respectively) of current cold rolled stainless steel sheet electrode plate for pickling tank, belongs to Slab thin wall casting, and the difficulty of cast form is comparatively large, and monolithic molding mechanical property is poor.The impact flexibility of the common high silicon iron-base alloy battery lead plate nowadays used is about 0.9J/cm
2, be about 1.5J/cm containing the impact flexibility of the high silicon iron-base alloy of Cu4%-6%
2, the impact flexibility adding the high silicon iron-base alloy of Re0.2% is about 1.4J/cm
2.When handling, installation, especially very easily there is the production accidents such as fracture when dismantling the high silicon iron-base alloy battery lead plate after losing efficacy 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 copper mesh compound high silicon iron-base alloy battery lead plate.
Summary of the invention
The appearance and size difficulty that is comparatively large, cast form that the present invention seeks to solve cold rolled stainless steel sheet electrode plate for pickling tank is comparatively large, and the problem that monolithic molding mechanical property is poor.
One adds copper mesh compound high silicon iron-base alloy battery lead plate, puies forward heavy alloyed mechanical property, and main cause uses to add the mechanical property that copper mesh improves alloy, thus solve the shortcoming of high-silicon cast iron, has great meaning to its application.
One adds copper mesh compound high silicon iron-base alloy battery lead plate, it is characterized in that the copper mesh castingin method of cast form formed by the fine copper material of φ 12mm is in high silicon iron-base alloy, formed be similar to reinforced concrete structure add copper mesh compound high silicon iron-base alloy, the volume fraction of its fine copper is 10 ~ 15%, the volume fraction of high silicon iron-base alloy is 85 ~ 90%, adopts this copper mesh compound high silicon iron-base alloy that adds to make acid-washing stainless steel battery lead plate and be and add copper mesh compound high silicon iron-base alloy battery lead plate.
The above-mentioned copper mesh compound high silicon iron-base alloy battery lead plate that adds adopts machine knits method that the pure copper wires of φ 12mm is woven into copper mesh, and adopt this copper mesh as reinforcing mat, the distance in copper mesh between every root 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 of band copper mesh, foam plastics mould is vaporized, copper mesh surface part melts, non-melt portions is retained in casting mold, formed after solidification forming a kind of be similar to the structure of armored concrete add copper mesh compound high silicon iron-base alloy battery lead plate.
In foaming patternmaking process, by the copper mesh fixed foam plastics apperance that descales in advance, copper mesh is positioned at center at battery lead plate thickness direction, and the distance of two sidewalls of distance die cavity is equal.
The chemical composition mass percent adding copper mesh compound high silicon iron-base alloy battery lead plate 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 are the composition of Fe and inevitable impurity; Heart portion copper mesh does reinforcing mat.
The manufacture method adding copper mesh compound high silicon iron-base alloy battery lead plate provided by the invention is: alloy melting: pure iron, ferrosilicon added in electric induction furnace or electric arc furnaces and carry out melting, various material is fully mixed, and in fusion process, add acid slag former, after aluminium alloy fusing after sufficient standing, remove the gas in aluminium alloy and field trash, the smelting temperature of alloy is 1480-1520 DEG C; Tapping temperature is 1420-1460 DEG C; Copper mesh is fixed in casting mold, when molten iron temperature is to castable when 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
inthe sectional area of sprue, cross gate and ingate respectively); 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 annealing in process immediately, and foundry goods hot charging enters stove, is uniformly heated to 750 ~ 800 DEG C, is incubated 48 ~ 72 hours stoves and is as cold as less than 150 DEG C and comes out of the stove.
Below the reason of the numerical definiteness of alloy composition of the present invention is described in detail.
(1) silicon (Si): 16.5 ~ 20.0% (weight)
When 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 formed primarily of silica.At this moment corrosion resistance sharply rises, when silicon content lower than 14.5% time, the oxidated iron film of corrosion resistance controls; Silicon content higher than 14.6% time, corrosion resistance controls by silicon dioxide film.Therefore excellent corrosion resistance must just be had containing the silicon being not less than 14.5% in cast iron.Corrosion resisting property improves with the increase of silicon content, but too high silicon content can generate the stable brittlement 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, thick graphite can be separated out, cause serious tissue looseness.This is because the solvability of Si in alpha ferrite is stronger than C, and Si accelerates again the diffusion of C, therefore C is just squeezed out by Si and forms the flake graphite of free state, along with the carbon containing of alloy increases, the size of the flake graphite of separating out increases, increasing number, 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 expanding austenitic area in ferrous alloy, and silicon is the element reducing austenitic area, a small amount of manganese will be solid-solubilized in alpha ferrite in high silicon iron-base alloy, corrosion resistance and the mechanical impact of alloy 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 uneven of component distributing, the electrode potential of local microcell is caused to there is 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 increase of S can reduce corrosion resistance and the mechanical performance of 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 less than 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 carry 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.Containing Cu6.5% ~ 8.5% high-silicon cast iron except in the nitric acid of 45% concentration corrosion resistance slightly poor except, in other medium, all have good corrosion resistance.High-silicon cast iron containing Cu8% ~ 10% all has high corrosion resistance in the sulfuric acid of the various concentration of 80 DEG C, and rate of corrosion is all less than 0.3mm/, and it can be used to the chemical machinery part of the hot sulfuric acid manufactured 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 adding copper mesh compound high silicon iron-base alloy battery lead plate 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 manufactured size comparatively large (maximum length is 3m) completely.
Accompanying drawing explanation
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 the manufacturing process adding copper mesh compound high silicon iron-base alloy battery lead plate of cold rolled stainless steel sheet pickling tube in the present invention is described in detail:
The production technology adding copper mesh compound high silicon iron-base alloy battery lead plate comprises several operations such as the making of reinforcing mat, alloy melting, Design of Runner System, moulding, cast and heat treatment.
(1) making of reinforcing mat and rust cleaning
It is for subsequent use that the pure copper wires of reinforcing mat φ 12mm is woven into copper mesh.
(2) melting of alloy
High silicon iron-base alloy can adopt electric induction furnace or arc melting, and adopt acid lining, the raw material of molten alloy have: pure iron, 75 ferrosilicon, and foundry returns etc. require that raw material drying is become rusty less.Adopt the method for twice melting, the object of first time melting is batch mixing, all raw material is evenly melt-blended, pour into ingot for subsequent use, charging sequence during melting is followed successively by: pure iron, foundry returns, ferrosilicon etc., add acid slag former in fusion process, reduce the scaling loss of element in alloy melting process; Second time melting object is degassed slagging-off, obtains the aluminium alloy of high-quality, meets the requirement of cast electrode plate, adopt aforesaid ingot during melting, in fusion process, add acid slag former, after 1450 ~ 1480 DEG C of fusings, can come out of the stove after leaving standstill 40 minutes, tapping temperature is 1400 ~ 1420 DEG C.
(3) Metamorphism treatment
The object of Metamorphism treatment is crystal grain thinning and purification alloy, Metamorphism treatment adopts rare earth ferrosilicon alloy as alterant, adopt the method for ladle mesometamorphism process, added by alterant at the bottom of the bag of ladle before coming out of the stove, addition is the 0.2-1.0% of process 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 of relation casting quality, suppress slag effect in order to what strengthen 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
inthe sectional area of sprue, cross gate and ingate respectively); Suppress slag effect in order to what strengthen running gate system further, the cross gate constituent element of running gate system adds a fibrous filter net.
(5) moulding
In order to strengthen collapsibility and the deformability of casting mold, reducing casting stress, preventing casting process from cracking, ensure the surface quality of foundry goods, adopt phenolic sand molding.Reinforcing mat is fixed in casting mold simultaneously.
(6) pour into a mould
Adopt the pouring technology that low temperature waters 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, add copper mesh compound high silicon iron-base alloy battery lead plate and have to pass through annealing heat treatment, this is not only conducive to putting forward heavy alloyed mechanical property, and can ensure to cool slowly, eliminates thermal stress.Carry out hot shake-out in 6 ~ 12 minutes after casting solidification is shaped, the foundry goods of red heat is carried out annealing in process immediately, and foundry goods hot charging enters stove, is uniformly heated to 750 ~ 800 DEG C, is incubated 48 ~ 72 hours stoves and is as cold as less than 150 DEG C and comes out of the stove.
Claims (4)
1. one kind adds the preparation method of copper mesh compound high silicon iron-base alloy battery lead plate, it is characterized in that the copper mesh castingin be woven into by the pure copper wires of φ 12mm by the method for cast form is in high silicon iron-base alloy, form the copper mesh compound high silicon iron-base alloy being similar to 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 copper mesh compound high silicon iron-base alloy that adds to make acid-washing stainless steel battery lead plate and be and add copper mesh compound high silicon iron-base alloy battery lead plate;
Distance in copper mesh between every root pure copper wires is 50mm;
Copper mesh is embedded in casting mold die cavity, melted liquid high silicon iron-base alloy is poured in the casting mold of band steel copper mesh, the pure copper wires surface local melting of φ 12mm, realize good metallurgical binding, but major part is still retained in casting mold, formed after solidification forming a kind of be similar to the structure of armored concrete add pure copper wires net compound high silicon iron-base alloy battery lead plate;
In foaming patternmaking process, by the fine copper net fixed foam plastics apperance of establishment, fine copper net is positioned at center at battery lead plate thickness direction, and the distance of two sidewalls of distance die cavity is equal.
2., according to the preparation method adding copper mesh compound high silicon iron-base alloy battery lead plate according to claim 1, it is characterized in that adding copper mesh compound high silicon iron-base alloy battery lead plate 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%, partial melting copper, all the other are the composition of Fe and inevitable impurity; Heart portion copper does reinforcing mat.
3. according to the preparation method adding copper mesh compound high silicon iron-base alloy battery lead plate according to claim 1, it is characterized in that, adopt steel scrap, ferrosilicon, rare earth configuration alloy raw material, join in acid electric induction furnace or electric arc furnaces and carry out melting, smelting temperature 1450 ~ 1480 DEG C, acid slag former is added in fusion process, Metamorphism treatment is carried out in ladle, after molten alloy, rare earth ferrosilicon alloy is added at the bottom of molten iron handbag, rare earth ferrosilicon alloy addition is 0.2 ~ 1.0% of process weight of molten iron, melted molten iron is poured in ladle and react with rare earth ferrosilicon alloy, tapping temperature is 1400-1420 DEG C, the sufficiently long time is left standstill, after removing gas in aluminium alloy and field trash, when molten iron temperature is to castable when 1250 ~ 1280 DEG C after coming out of the stove.
4. according to the preparation method adding copper mesh compound high silicon iron-base alloy battery lead plate according to claim 1, it is characterized in that, adopt resin bonded sand mould, copper mesh is fixed in casting mold, when molten iron temperature is to castable when 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
inthe sectional area of sprue, cross gate and ingate respectively.
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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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