CN103469113B - 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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- CN103469113B CN103469113B CN201310332558.5A CN201310332558A CN103469113B CN 103469113 B CN103469113 B CN 103469113B CN 201310332558 A CN201310332558 A CN 201310332558A CN 103469113 B CN103469113 B CN 103469113B
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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 smelting iron and steel technical field, particularly relate to during the leaded free cutting stainless steel of a kind of nib is smelted the technique improving plumbous recovery rate.
Background technology
Nib stainless material generally needs the machinability with degree of precision, 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.
Compared to unleaded stainless steel, leaded stainless cutting ability can improve 20% ~ 50%.Because lead with small elemental metals size distribution in stainless steel base, and admittedly do not melt 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 play lubrication, and then stainless cutting ability can be improved, make stainless chip in small, broken bits, reduce tool wear, reach the object extending cutter life.Because the mechanical property of leaded free cutting stainless steel and heat treatment performance remain unchanged substantially, thus on the hot and cold processibility of workpiece and weldability impact very little.Therefore leaded free cutting stainless steel has been widely used as the strength member manufacturing precision meter part, auto parts, all kinds of machinery.
In actual production, the temperature of molten steel is generally more than 1300 DEG C, because the density of lead 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 lead steam effusion when temperature reaches 400 DEG C ~ 500 DEG C and form lead fume, when lead joins in stainless steel water, because the temperature of stainless steel water is higher, contact surface that is plumbous and stainless steel water can produce lead fume instantaneously and evaporate, this makes the lead amount that adds in stainless steel large, but recovery rate is but very low, in reality is produced greatly, want the lead content difficulty in stability contorting stainless steel larger.And plumbous density is 11.3437g/cm
3, and the mean density of stainless steel water is 7.2kg/cm
3, so 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, namely needs to invent a kind of new technique, the low and segregation problems with the recovery rate solving lead.
Summary of the invention
For the defect existed in above-mentioned prior art or deficiency, the object of the invention is to, improve the technique of plumbous recovery rate in providing the leaded free cutting stainless steel of a kind of nib to smelt, the recovery rate of lead can 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:
Nib improves a smelting technology for plumbous recovery rate in smelting with leaded free cutting stainless steel, it is characterized in that, specifically comprise the following steps:
1) lead button to be plated is cleaned, flood sensitized treatment with stannous chloride solution, then carry out activation treatment with palladium chloride solution dipping, dry in an inert atmosphere afterwards; Or, lead button to be plated is cleaned, floods in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under an inert atmosphere afterwards;
2) lead button handled well is stirred 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 made up of the room temperature molten salt of iron content and reductive agent; Or described chemical plating fluid is made up of the room temperature molten salt of iron content, quaternary ammonium compound and reductive agent;
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 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 the leaded free cutting stainless steel steel ingot or continuously cast bloom that are evenly distributed.
Granularity plumbous in this leaded free cutting stainless steel steel ingot or continuously cast bloom is 6.2 μm ~ 10.4 μm.
According to the present invention, the room temperature molten 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 often 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 molten salt of the iron content in described chemical plating fluid and the mol ratio of quaternary ammonium compound are 1:1 ~ 7:2.
Improve the smelting technology of plumbous recovery rate in adopting the leaded free cutting stainless steel of nib of the present invention to smelt, have good application value, the technique effect brought is:
1. decrease plumbous vapour loss in adition process, lead is evenly distributed in the base, and content is controlled, and plumbous content in the base can be controlled in 0.19% ~ 0.41% scope.Improve plumbous recovery rate;
2. can reduce the density of lead button at lead button Surface coating layer protective layer, reduce the situation of plumbous segregation in stainless steel.Make plumbous recovery rate reach more than 90%, in the free cutting stainless steel smelted, lead is evenly distributed in the base, and plumbous granularity is 6.2 μm ~ 10.4 μm, has good application value.
Accompanying drawing explanation
Fig. 1 is the process flow diagram improving plumbous recovery rate during the leaded free cutting stainless steel of nib of the present invention is smelted.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment
Below in an example; contriver provides during the leaded free cutting stainless steel of a kind of nib is specifically smelted the smelting technology improving plumbous recovery rate; it is the protective layer at lead button plated surface last layer metallic iron; again the lead button plated is injected in molten stainless steel under inert carrier gas, forms free cutting stainless steel steel ingot or continuously cast bloom that the leaded granularity be evenly distributed in stainless steel base is 6.2 μm ~ 10.4 μm.
Concrete processing step is:
1) lead button to be plated is cleaned, flood sensitized treatment with stannous chloride solution, then carry out activation treatment with palladium chloride solution dipping, dry in an inert atmosphere afterwards; Or, lead button to be plated is cleaned, floods in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under an inert atmosphere afterwards;
2) lead button handled well is stirred 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 made up of the room temperature molten salt of iron content and reductive agent; Or described chemical plating fluid is made up of the room temperature molten salt of iron content, quaternary ammonium compound and reductive agent;
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 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 granularity and is 6.2 μm ~ 10.4 μm and the leaded free cutting stainless steel steel ingot be evenly distributed or continuously cast bloom.
The room temperature molten 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)
2or Iron nitrate (Fe (NO Fe)
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.
Described room temperature molten salt and the mol ratio of quaternary ammonium compound are 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 often 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 inert carrier gas body is argon gas.
It is below the embodiment that contriver provides.
Embodiment: plated surface one deck Fe of lead button coating layer and join in 10Cr17 stainless steel
(1) pre-treatment of lead button
1) at ambient temperature, getting 300 gram particle degree is the lead button of 1 ~ 3mm, lead button is added stir about 30min in methyl alcohol, and the organic impurity on lead button surface is removed in cleaning;
2) after lead button drying, then lead button is joined acetone stirring 30min, to clean the dirts such as the grease of removing lead button surface existence, afterwards that lead button is dry at inert atmosphere;
3) sensitized treatment: the deionized water getting 5950ml under room temperature adds the SnCl of 180g
2, then add 50ml concentrated hydrochloric acid and make it dissolve completely, obtained sensitizing solution, adds in sensitizing solution by the lead button after cleaning, after dipping stirs 1h, dry under an inert atmosphere;
4) activation treatment: the deionized water getting 5950ml, adds the PbCl of 3g wherein
2, then add 50ml concentrated hydrochloric acid and make it dissolve completely, obtained activation solution, adds in activation solution by the lead button after sensitized treatment, after dipping stirs 1h, dry under an inert atmosphere.
Or, in sensitizing solution prepared by step 3), add the PbCl of 3g
2, make mixing sensitization and the activated solution of tin protochloride and Palladous chloride, the lead button after sensitized treatment is added in sensitization and activation solution, after dipping stirs 2h, dry under an inert atmosphere.
(2) preparation of chemical plating solution
Prepared by chemical plating iron solution 1:
1) in Temperature controlled heater, maintain the temperature at about 60 DEG C, get 6000ml deionized water, slowly add 1200g iron protochloride (FeCl while stirring
2), iron protochloride is dissolved completely;
2) after ferrous iron to be chlorinated dissolves completely, slowly while stirring add tetramethyl ammonium chloride to solution, tetramethyl ammonium chloride is dissolved completely, and the mol ratio of iron protochloride and tetramethyl ammonium chloride is 3:1;
3) plating solution is at room temperature cooled, in plating solution, add enough iron wire thorough impregnations, refining seven days of at room temperature displacement, obtained chemical plating iron solution 1.
Prepared by chemical plating iron solution 2:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use ferrous ammonium sulphate ((NH
4)
2sO
4feSO
4) replace, other are with chemical plating solution 1, obtained chemical plating iron solution 2.
Prepared by chemical plating iron solution 3:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use ferrous sulfate (FeSO
4) replace, other are with chemical plating solution 1, obtained chemical plating iron solution 3.
Prepared by chemical plating iron solution 4:
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, obtained chemical plating iron solution 4.
Prepared by chemical plating iron solution 5:
By the iron protochloride (FeCl in chemical plating iron solution 1
2) use Iron nitrate (Fe (NO
3)
2) replace, other are with chemical plating solution 1, obtained chemical plating iron solution 5.
Prepared by chemical plating iron solution 6:
Replaced by tetramethyl ammonium chloride in chemical plating iron solution 1 tetraethyl-halogeno-amine, other are with chemical plating solution 1, obtained chemical plating iron solution 6.
Prepared by chemical plating iron solution 7:
Replaced by the 1-methyl-3-ethyl halogeno-amine of tetramethyl ammonium chloride in chemical plating iron solution 1, other are with chemical plating solution 1, obtained chemical plating iron solution 7.
Prepared by chemical plating iron solution 8:
Replaced by tetramethyl ammonium chloride in chemical plating iron solution 1 1-ethyl-3-methyl halogeno-amine, other are with chemical plating solution 1, obtained chemical plating iron solution 8.
Prepared by chemical plating iron solution 9:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 1:1, other are with chemical plating solution 1, obtained chemical plating iron solution 9.
Prepared by chemical plating iron solution 10:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 2:1, other are with chemical plating solution 1, obtained chemical plating iron solution 10.
Prepared by chemical plating iron solution 11:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 5:2, other are with chemical plating solution 1, obtained chemical plating iron solution 11.
Prepared by chemical plating iron solution 12:
Change the mol ratio of the iron protochloride in chemical plating iron solution 1 and tetramethyl ammonium chloride into 7:2, other are with chemical plating solution 1, obtained chemical plating iron solution 12.
(3) chemical plating iron embodiment
Plating iron example 1:
1) the chemical plating iron solution 1 of 6000ml is chosen, Temperature controlled heater is used to keep chemical plating iron solution 1 temperature at about 40 DEG C, get stirring chemical plating iron solution 1 limit, 60g lithium hydride (LiH) limit more slowly LiH progressively to be joined in chemical plating iron solution 1, make reductive agent LiH dispersing and dissolving in chemical plating iron solution 1;
2) after LiH dissolves completely, in chemical plating iron solution 1, add NaOH adjust ph, the pH keeping chemical plating iron solution 1 is between 8 to 12;
3) at ambient temperature, limit is stirred chemical plating iron solution 1 limit and is slowly joined in chemical plating iron solution 1 by the lead button after process, after solution fully stirs 1h, at room temperature sinks and puts two days, obtain plating iron lead button 1.
Plating iron example 2:
Replaced with chemical plating iron solution 2 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 2.
Plating iron example 3:
Replaced with chemical plating iron solution 3 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 3.
Plating iron example 4:
Replaced with chemical plating iron solution 4 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 4.
Plating iron example 5:
Replaced with chemical plating iron solution 5 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 5.
Plating iron example 6:
Replaced with chemical plating iron solution 6 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 6.
Plating iron example 7:
Replaced with chemical plating iron solution 7 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 7.
Plating iron example 8:
Replaced with chemical plating iron solution 8 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 8.
Plating iron example 9:
Replaced with chemical plating iron solution 9 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 9.
Plating iron example 10:
Replaced with chemical plating iron solution 10 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 10.
Plating iron example 11:
Replaced with chemical plating iron solution 11 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 11.
Plating iron example 12:
Replaced with chemical plating iron solution 12 by chemical plating iron solution 1 in plating iron example 1, other are all identical with plating iron example 1, obtain plating iron lead button 12.
Plating iron example 13(comparative example):
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 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, leaded free cutting stainless steel steel ingot or continuously cast bloom is formed,
3) smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.4%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 9.1 μm.
Leading example 2:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 2, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.8 μm.
Leading example 3:
The present embodiment and leading example 1 difference are replaced with plating iron lead button 3 by plating iron lead button 1, and lead button is 0.31% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 91.5%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed in the base, and the mean particle size of lead button is 8.2 μm.
Leading example 4:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 4, and lead button is 0.30% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 90.7%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.2 μm.
Leading example 5:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 5, and lead button is 0.33% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 91.0%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.0 μm.
Leading example 6:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 6, and lead button is 0.37% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.4%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.8 μm.
Leading example 7:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 7, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.2%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μm.
Leading example 8:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 8, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μm.
Leading example 9:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 9, and lead button is 0.23% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 90.1%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 7.4 μm.
Leading example 10:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 10, and lead button is 0.27% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 90.5%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.1 μm.
Leading example 11:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 10, and lead button is 0.30% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 91.4%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.3 μm.
Leading example 12:
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 10, and lead button is 0.35% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is 92.1%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button is evenly distributed, and the mean particle size of lead button is 8.7 μm.
Leading example 13(comparative example):
The present embodiment and leading example 1 difference are replaced by plating iron lead button 1 plating iron lead button 10, and lead button is 0.03% at the content of molten stainless steel, and other steps are all identical with leading example 1;
Smelt the leaded free cutting stainless steel steel ingot that obtains or continuously cast bloom, after testing, plumbous average recovery rate is only 43.3%, and in the leaded free cutting stainless steel steel ingot smelted or continuously cast bloom, lead button has the generation of segregation phenomena, and plumbous mean particle size is 1.7 μm.
Claims (4)
1. nib improves a smelting technology for 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, flood sensitized treatment with stannous chloride solution, then carry out activation treatment with palladium chloride solution dipping, dry in an inert atmosphere afterwards; Or, lead button to be plated is cleaned, floods in the mixing solutions of tin protochloride and Palladous chloride, carry out sensitization and activation treatment; Dry under an inert atmosphere afterwards;
2) lead button handled well is stirred 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 made up of the room temperature molten salt of iron content and reductive agent; Or described chemical plating fluid is made up of the room temperature molten salt of iron content, quaternary ammonium compound and reductive agent;
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 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 the leaded free cutting stainless steel steel ingot or continuously cast bloom that are evenly distributed.
2. technique as claimed in claim 1, is characterized in that:
The room temperature molten 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 one or more mixtures in lithium hydride, lithium aluminium hydride, sodium alanate, lithium borohydride and sodium borohydride, and in often 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, it is characterized in that, the room temperature molten 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, the lead button degree in described leaded free cutting stainless steel steel ingot or continuously cast bloom is 6.2 μm ~ 10.4 μm.
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|---|---|---|---|
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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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| CN103469113B true CN103469113B (en) | 2015-03-25 |
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| JPH03199339A (en) * | 1989-12-27 | 1991-08-30 | Sumitomo Metal Ind Ltd | Production of lead free-cutting steel |
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| 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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