CN103469113A - Process for increasing lead yield in smelt of free-cutting stainless steel used for nibs - Google Patents
Process for increasing lead yield in smelt of free-cutting stainless steel used for nibs Download PDFInfo
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- CN103469113A CN103469113A CN2013103325585A CN201310332558A CN103469113A CN 103469113 A CN103469113 A CN 103469113A CN 2013103325585 A CN2013103325585 A CN 2013103325585A CN 201310332558 A CN201310332558 A CN 201310332558A CN 103469113 A CN103469113 A CN 103469113A
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Abstract
The invention discloses a smelting process for increasing lead yield in smelt of free-cutting stainless steel used for nibs. The process comprises the steps of coating a protective layer of metal iron on the surface of lead particles; then spraying the lead particles coated by the protective layer into a liquid steel through an inert carrier gas; and forming a lead-containing free-cutting stainless steel ingot or continuous casting billet after the stainless steel metal liquid is solidified. With the process, the lead yield is greatly increased; the lead yield reaches over 90%; lead segregation in the lead-containing free-cutting stainless steel ingot or continuous casting billet can be prevented; lead is distributed uniformly in the smelted lead-containing free-cutting stainless steel ingot or continuous casting billet; and the particle size of the lead is 6.2 [mu]m-10.4 [mu]m. The lead content in the lead-containing free-cutting stainless steel ingot or continuous casting billet is controlled within 0.19%-0.41%. The process has very good popularization and application values.
Description
Technical field
The invention belongs to the smelting iron and steel technical field, relate in particular to a kind of nib with improving the technique of plumbous recovery rate in leaded free cutting stainless steel smelting.
Background technology
Nib generally need to have the machinability of degree of precision with stainless material, in order to improve stainless machinability, improve cutting speed and cutter life, need in steel, add a certain amount of lead element, make a kind of leaded free cutting stainless steel material.
Than unleaded stainless steel, leaded stainless cutting ability can improve 20%～50%.Because plumbous with small elemental metals size distribution in stainless steel base, and it is not admittedly molten in stainless steel, in cutting process, produce heat because of strong friction between cutter and processing work, make the plumbous particles fuse in stainless steel become liquid and separate out, thus the lubrication of playing, and then can improve stainless cutting ability, make stainless smear metal in small, broken bits, reduce tool wear, reached the purpose that extends cutter life.Because mechanical property and the heat treatment performance of leaded free cutting stainless steel remains unchanged substantially, so very little on hot and cold processibility and the weldability impact of workpiece.Therefore leaded free cutting stainless steel has been widely used as the strength member of manufacturing precision meter part, auto parts, all kinds of machineries.
In actual production, the temperature of molten steel is generally more than 1300 ℃, because plumbous density is higher, fusing point is lower, solubleness in stainless steel is very little, vapour pressure is larger, so highly volatile, and plumbous segregation is easy to occur, just have the lead steam effusion and form lead fume when temperature reaches 400 ℃～500 ℃, when lead joins in stainless steel water, because the temperature of stainless steel water is higher, the plumbous contact surface with stainless steel water can produce the lead fume evaporation moment, this makes the lead amount added in stainless steel large, yet recovery rate is but very low, to stablize the lead content difficulty of controlling in stainless steel larger in the large production of reality.And plumbous density is 11.3437g/cm
3, and the mean density of stainless steel water is 7.2kg/cm
3so lead joins in stainless steel water can produce segregation.
Therefore, how improving recovery rate plumbous in leaded free cutting stainless steel is current steel industry urgent problem, needs to invent a kind of new technique, to solve plumbous recovery rate, hangs down and the segregation problem.
Summary of the invention
For the defect existed in above-mentioned prior art or deficiency, the object of the invention is to, provide a kind of nib with improving the technique of plumbous recovery rate in leaded free cutting stainless steel smelting, plumbous recovery rate can be able to be brought up to more than 90%, reduce plumbous segregation simultaneously.
In order to realize above-mentioned task, the present invention adopts following technical solution to be achieved:
A kind of nib improves the smelting technology of plumbous recovery rate in smelting with leaded free cutting stainless steel, it is characterized in that, specifically comprises the following steps:
1) lead button to be plated is cleaned, process with the sensitization of stannous chloride solution dipping, then with the palladium chloride solution dipping, carry out activation treatment, dry in inert atmosphere afterwards; Perhaps, lead button to be plated is cleaned, flood in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under inert atmosphere afterwards;
2) lead button of handling well is stirred to dipping in chemical plating fluid, carry out electroless plating, the thickness of coating on the lead button surface after plating is 1～3mm;
Described chemical plating fluid is comprised of room temperature melting salt and the reductive agent of iron content; Perhaps, described chemical plating fluid is comprised of room temperature melting salt, quaternary ammonium compound and the reductive agent of iron content;
3) by the lead button after electroless plating, with spray gun, under the protection of inert carrier gas, winding-up joins in molten stainless steel, and blowing gas pressure is 0.25Mpa～0.45Mpa, and the inert carrier gas flow is 1.0m
3/ h～2.5m
3/ h, lead button is between 0.19%～0.41% at the content of molten stainless steel, after molten stainless steel is solidified, forms leaded free cutting stainless steel steel ingot or the continuously cast bloom that are evenly distributed.
Granularity plumbous in the free cutting stainless steel steel ingot that this is leaded or continuously cast bloom is 6.2 μ m～10.4 μ m.
According to the present invention, the room temperature melting salt of the iron content in described chemical plating fluid is iron protochloride (FeCl
2), ferrous ammonium sulphate ((NH
4)
2sO
4feSO
4), ferrous sulfate (FeSO
4), Iron diacetate ((C
2h
3o
2)
2fe), Iron nitrate (Fe(NO
3)
2) one of them;
Reductive agent in described chemical plating fluid is wherein one or more mixtures in lithium hydride, lithium aluminium hydride, sodium alanate, lithium borohydride, sodium borohydride, and in every liter of chemical plating fluid, the content of reductive agent is 1.5～3.5g;
Quaternary ammonium compound in described chemical plating fluid is tetramethyl-halogeno-amine, tetraethyl-halogeno-amine, 1-methyl-3-ethyl halogeno-amine or 1-ethyl-3-methyl halogeno-amine.
The room temperature melting salt of the iron content in described chemical plating fluid and the mol ratio of quaternary ammonium compound are 1:1～7:2.
Adopt nib of the present invention with improving the smelting technology of plumbous recovery rate in leaded free cutting stainless steel smelting, have good application value, the technique effect brought is:
1. reduced plumbous vapour loss in adition process, lead is evenly distributed in matrix, and content is controlled, and plumbous content in matrix can be controlled in 0.19%～0.41% scope.Improved plumbous recovery rate;
2. coat on the lead button surface density that layer protective layer can reduce lead button, reduced the situation of plumbous segregation in the stainless steel.Plumbous recovery rate is reached more than 90%, and in the free cutting stainless steel of smelting, lead is evenly distributed in matrix, and plumbous granularity is 6.2 μ m～10.4 μ m, has good application value.
The accompanying drawing explanation
Fig. 1 improves the process flow diagram of plumbous recovery rate during nib of the present invention is smelted with leaded free cutting stainless steel.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment
In following embodiment; the contriver provides a kind of concrete nib with improving the smelting technology of plumbous recovery rate in leaded free cutting stainless steel smelting; it is the protective layer at lead button plated surface last layer metallic iron; in again the lead button plated being injected to molten stainless steel under inert carrier gas, free cutting stainless steel steel ingot or continuously cast bloom that the leaded granularity be evenly distributed in the formation stainless steel base is 6.2 μ m～10.4 μ m.
Concrete processing step is:
1) lead button to be plated is cleaned, process with the sensitization of stannous chloride solution dipping, then with the palladium chloride solution dipping, carry out activation treatment, dry in inert atmosphere afterwards; Perhaps, lead button to be plated is cleaned, flood in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under inert atmosphere afterwards;
2) lead button of handling well is stirred to dipping in chemical plating fluid, carry out electroless plating, the thickness of coating on the lead button surface after plating is 1～3mm;
Described chemical plating fluid is comprised of room temperature melting salt and the reductive agent of iron content; Perhaps, described chemical plating fluid is comprised of room temperature melting salt, quaternary ammonium compound and the reductive agent of iron content;
3) by the lead button after electroless plating, with spray gun, under the protection of inert carrier gas, winding-up joins in molten stainless steel, and blowing gas pressure is 0.25Mpa～0.45Mpa, and the inert carrier gas flow is 1.0m
3/ h～2.5m
3/ h, lead button is between 0.19%～0.41% at the content of molten stainless steel, after molten stainless steel is solidified, leaded free cutting stainless steel steel ingot or the continuously cast bloom that form leaded granularity and be 6.2 μ m～10.4 μ m and be evenly distributed.
The room temperature melting salt of the iron content in described chemical plating fluid is iron protochloride (FeCl
2), ferrous ammonium sulphate ((NH
4)
2sO
4feSO
4), ferrous sulfate (FeSO
4), Iron diacetate ((C
2h
3o
2)
2fe) or Iron nitrate (Fe (NO
3)
2).
Quaternary ammonium compound in described chemical plating fluid is tetramethyl-halogeno-amine, tetraethyl-halogeno-amine, 1-methyl-3-ethyl halogeno-amine, 1-ethyl-3-methyl halogeno-amine.
The mol ratio of described room temperature melting salt and quaternary ammonium compound is 1:1～7:2.
Reductive agent in described chemical plating fluid is one or more mixtures in lithium hydride, lithium aluminium hydride, sodium alanate, lithium borohydride, sodium borohydride, and in every liter of chemical plating fluid, the content of reductive agent is 1.5～3.5g.
Described sensitizing solution is stannous chloride solution, and in the sensitizing solution of every 100ml, tin protochloride content is 1.7～3.3g.
Described activation solution is palladium chloride solution, and in the activation solution of every 100ml, Palladous chloride content is 0.02～0.07g.
Described inertia dry gas is argon gas, and the inert carrier gas body is argon gas.
Below the embodiment that the contriver provides.
Embodiment: at the coating layer of plated surface one deck Fe of lead button and in joining the 10Cr17 stainless steel
(1) pre-treatment of lead button
1) at ambient temperature, get the lead button that 300 gram particle degree are 1～3mm, lead button is added to stir about 30min in methyl alcohol, clean the organic impurity of removing the lead button surface;
2) after the lead button drying, then lead button joined to acetone stir 30min, with cleaning, remove the dirts such as grease that the lead button surface exists, afterwards by lead button in the inert atmosphere drying;
3) sensitization is processed: the deionized water of getting 5950ml under room temperature adds the SnCl of 180g
2, then add the 50ml concentrated hydrochloric acid that it is dissolved fully, and make sensitizing solution, the lead button after cleaning is added in sensitizing solution, after dipping stirs 1h, dry under inert atmosphere;
4) activation treatment: get the deionized water of 5950ml, add therein the PbCl of 3g
2, then add the 50ml concentrated hydrochloric acid that it is dissolved fully, and making activation solution, the lead button after sensitization is processed adds in activation solution, after dipping stirs 1h, dry under inert atmosphere.
Perhaps, the PbCl that adds 3g in the sensitizing solution prepared in step 3)
2, make mixing sensitization and the activated solution of tin protochloride and Palladous chloride, the lead button after sensitization is processed adds in sensitization and activation solution, after dipping stirs 2h, dry under inert atmosphere.
(2) preparation of chemical plating solution
1 preparation of chemical plating iron solution:
1) in Temperature controlled heater, maintain the temperature at 60 ℃ of left and right, get the 6000ml deionized water, slowly add while stirring 1200g iron protochloride (FeCl
2), iron protochloride is dissolved fully;
2) after ferrous iron to be chlorinated dissolves fully, slowly to solution, add tetramethyl ammonium chloride while stirring, tetramethyl ammonium chloride is dissolved fully, the mol ratio of iron protochloride and tetramethyl ammonium chloride is 3:1;
3) plating solution is at room temperature cooling, add enough iron wire thorough impregnations in plating solution, refining seven days of at room temperature displacement, make chemical plating iron solution 1.
2 preparations of chemical plating iron solution:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use ferrous ammonium sulphate ((NH
4)
2sO
4feSO
4) replace, other,, with chemical plating solution 1, make chemical plating iron solution 2.
3 preparations of chemical plating iron solution:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use ferrous sulfate (FeSO
4) replace, other,, with chemical plating solution 1, make chemical plating iron solution 3.
4 preparations of chemical plating iron solution:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use Iron diacetate ((C
2h
3o
2)
2fe) replace, other other with chemical plating solution 1, make chemical plating iron solution 4.
5 preparations of chemical plating iron solution:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use Iron nitrate (Fe (NO
3)
2) replace, other,, with chemical plating solution 1, make chemical plating iron solution 5.
6 preparations of chemical plating iron solution:
Tetramethyl ammonium chloride in chemical plating iron solution 1 is replaced with the tetraethyl-halogeno-amine, and other,, with chemical plating solution 1, make chemical plating iron solution 6.
7 preparations of chemical plating iron solution:
1-methyl-3-ethyl halogeno-amine for tetramethyl ammonium chloride in chemical plating iron solution 1 is replaced, and other,, with chemical plating solution 1, make chemical plating iron solution 7.
8 preparations of chemical plating iron solution:
1-ethyl-3-methyl halogeno-amine for tetramethyl ammonium chloride in chemical plating iron solution 1 is replaced, and other,, with chemical plating solution 1, make chemical plating iron solution 8.
9 preparations of chemical plating iron solution:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 1:1, other,, with chemical plating solution 1, make chemical plating iron solution 9.
10 preparations of chemical plating iron solution:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 2:1, other,, with chemical plating solution 1, make chemical plating iron solution 10.
11 preparations of chemical plating iron solution:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 5:2, other,, with chemical plating solution 1, make chemical plating iron solution 11.
12 preparations of chemical plating iron solution:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 7:2, other,, with chemical plating solution 1, make chemical plating iron solution 12.
(3) chemical plating iron embodiment
Plating iron example 1:
1) choose the chemical plating iron solution 1 of 6000ml, use Temperature controlled heater to keep chemical plating iron solution 1 temperature 40 ℃ of left and right, get again stirring chemical plating iron solution 1 limit, 60g lithium hydride (LiH) limit and slowly LiH is progressively joined in chemical plating iron solution 1, make reductive agent LiH dispersing and dissolving in chemical plating iron solution 1;
2) after LiH dissolves fully, in chemical plating iron solution 1, add NaOH to regulate the pH value, keeping the pH of chemical plating iron solution 1 is between 8 to 12;
3) at ambient temperature, limit is stirred chemical plating iron solution 1 limit the lead button after processing is slowly joined in chemical plating iron solution 1, and after solution fully stirs 1h, at room temperature heavy putting two days, obtain plating iron lead button 1.
Plating iron example 2:
Chemical plating iron solution 1 use chemical plating iron solution 2 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 2.
Plating iron example 3:
Chemical plating iron solution 1 use chemical plating iron solution 3 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 3.
Plating iron example 4:
Chemical plating iron solution 1 use chemical plating iron solution 4 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 4.
Plating iron example 5:
Chemical plating iron solution 1 use chemical plating iron solution 5 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 5.
Plating iron example 6:
Chemical plating iron solution 1 use chemical plating iron solution 6 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 6.
Plating iron example 7:
Chemical plating iron solution 1 use chemical plating iron solution 7 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 7.
Plating iron example 8:
Chemical plating iron solution 1 use chemical plating iron solution 8 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 8.
Plating iron example 9:
Chemical plating iron solution 1 use chemical plating iron solution 9 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 9.
Plating iron example 10:
Chemical plating iron solution 1 use chemical plating iron solution 10 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 10.
Plating iron example 11:
Chemical plating iron solution 1 use chemical plating iron solution 11 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 11.
Plating iron example 12:
Chemical plating iron solution 1 use chemical plating iron solution 12 in plating iron example 1 is replaced, and other are all identical with plating iron example 1, obtain plating iron lead button 12.
Plating iron example 13(Comparative Examples):
Chemical plating iron solution 1 in plating iron example 1 does not add LiH, and other is all identical with plating iron example 1, obtains plating iron lead button 13.
(4) lead button plated is joined in the 10Cr17 stainless steel
Leading example 1:
1) by the plating iron lead button 1 after electroless plating, with spray gun, under the protection of argon gas atmosphere, spray in the molten stainless steel in the medium-frequency induction furnace of 1.5T, lead button is 0.37% at the content of molten stainless steel, blowing gas pressure 0.33Mpa, argon flow amount 1.5m
3/ h;
2) after molten stainless steel is solidified, form leaded free cutting stainless steel steel ingot or continuously cast bloom,
3) smelt leaded free cutting stainless steel steel ingot or the continuously cast bloom obtained, after testing, plumbous average recovery rate is 92.4%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 9.1 μ m.
Leading example 2:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 2 is replaced, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.8 μ m.
Leading example 3:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use is replaced with plating iron lead button 3, and lead button is 0.31% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 91.5%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed in matrix, and the mean particle size of lead button is 8.2 μ m.
Leading example 4:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 4 is replaced, and lead button is 0.30% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 90.7%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.2 μ m.
Leading example 5:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 5 is replaced, and lead button is 0.33% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 91.0%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.0 μ m.
Leading example 6:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 6 is replaced, and lead button is 0.37% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 92.4%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.8 μ m.
Leading example 7:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 7 is replaced, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 92.2%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μ m.
Leading example 8:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 8 is replaced, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μ m.
Leading example 9:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 9 is replaced, and lead button is 0.23% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 90.1%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 7.4 μ m.
Leading example 10:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 10 is replaced, and lead button is 0.27% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 90.5%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.1 μ m.
Leading example 11:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 10 is replaced, and lead button is 0.30% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 91.4%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.3 μ m.
Leading example 12:
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 10 is replaced, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μ m.
Leading example 13(Comparative Examples):
The present embodiment and leading example 1 difference be, plating iron lead button 1 use plating iron lead button 10 is replaced, and lead button is 0.03% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Leaded free cutting stainless steel steel ingot or continuously cast bloom that smelting obtains, after testing, plumbous average recovery rate is only 43.3%, and in the leaded free cutting stainless steel steel ingot or continuously cast bloom of smelting, lead button has the generation of segregation phenomena, and plumbous mean particle size is 1.7 μ m.
Claims (4)
1. a nib improves the smelting technology of plumbous recovery rate in smelting with leaded free cutting stainless steel, it is characterized in that, specifically comprises the following steps:
1) lead button to be plated is cleaned, process with the sensitization of stannous chloride solution dipping, then with the palladium chloride solution dipping, carry out activation treatment, dry in inert atmosphere afterwards; Perhaps, lead button to be plated is cleaned, flood in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under inert atmosphere afterwards;
2) lead button of handling well is stirred to dipping in chemical plating fluid, carry out electroless plating, the thickness of coating on the lead button surface after plating is 1～3mm;
Described chemical plating fluid is comprised of room temperature melting salt and the reductive agent of iron content; Perhaps, described chemical plating fluid is comprised of room temperature melting salt, quaternary ammonium compound and the reductive agent of iron content;
3) by the lead button after electroless plating, with spray gun, under the protection of inert carrier gas, winding-up joins in molten stainless steel, and blowing gas pressure is 0.25Mpa～0.45Mpa, and the inert carrier gas flow is 1.0m
3/ h～2.5m
3/ h, lead button is between 0.19%～0.41% at the content of molten stainless steel, after molten stainless steel is solidified, forms leaded free cutting stainless steel steel ingot or the continuously cast bloom that are evenly distributed.
2. technique as claimed in claim 1 is characterized in that:
The room temperature melting salt of the iron content in described chemical plating fluid is iron protochloride (FeCl
2), ferrous ammonium sulphate ((NH
4)
2sO
4feSO
4), ferrous sulfate (FeSO
4), Iron diacetate ((C
2h
3o
2)
2fe), Iron nitrate (Fe(NO
3)
2) one of them;
Reductive agent in described chemical plating fluid is wherein one or more mixtures in lithium hydride, lithium aluminium hydride, sodium alanate, lithium borohydride, sodium borohydride, and in every liter of chemical plating fluid, the content of reductive agent is 1.5～3.5g;
Quaternary ammonium compound in described chemical plating fluid is tetramethyl-halogeno-amine, tetraethyl-halogeno-amine, 1-methyl-3-ethyl halogeno-amine or 1-ethyl-3-methyl halogeno-amine.
3. technique as claimed in claim 1 or 2, is characterized in that, the room temperature melting salt of described iron content and the mol ratio of quaternary ammonium compound are 1:1～7:2.
4. technique as claimed in claim 1 or 2, is characterized in that, described leaded free cutting stainless steel steel ingot or the lead button degree in continuously cast bloom are 6.2 μ m～10.4 μ m.
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|---|---|---|---|
| CN201310332558.5A CN103469113B (en) | 2013-08-01 | 2013-08-01 | Process for increasing lead yield in smelt of free-cutting stainless steel used for nibs |
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| JPS62149843A (en) * | 1985-12-23 | 1987-07-03 | Kawasaki Steel Corp | Production of lead free cutting steel |
| JPH03199339A (en) * | 1989-12-27 | 1991-08-30 | Sumitomo Metal Ind Ltd | Production of lead free-cutting steel |
| CN1498979A (en) * | 2002-11-08 | 2004-05-26 | 左生华 | Plumbum wrapped core wire |
| CN101386062A (en) * | 2007-09-10 | 2009-03-18 | 南京钢铁联合有限公司 | Production technique of lead treated steel |
| CN102828118A (en) * | 2012-09-13 | 2012-12-19 | 浙江腾龙精线有限公司 | Method for manufacturing free-cutting stainless steel wire for ball-point pen head |
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