CN104789848A - Smelting method for high-magnesium nodulizer and cored wire manufactured by adopting nodulizer as core - Google Patents
Smelting method for high-magnesium nodulizer and cored wire manufactured by adopting nodulizer as core Download PDFInfo
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- CN104789848A CN104789848A CN201510220124.5A CN201510220124A CN104789848A CN 104789848 A CN104789848 A CN 104789848A CN 201510220124 A CN201510220124 A CN 201510220124A CN 104789848 A CN104789848 A CN 104789848A
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Abstract
The invention discloses a smelting method for a high-magnesium nodulizer. The method comprises the steps: firstly, weighing 35 parts (by weight) of magnesium metal blocks, 44-51 parts (by weight) of ferro-silicon powder, 2.5 parts (by weight) of calcium metal blocks, 2.3 parts (by weight) of lanthanide pure rare earth and 9 parts (by weight) of silicon-barium alloy; sequentially adding the ferro-silicon powder, the calcium metal blocks, the silicon-barium alloy, the magnesium metal blocks and the lanthanide pure rare earth into an intermediate-frequency furnace, fully melting, then, rapidly pouring melt into a mold under the protection of nitrogen gas, cooling to normal temperature, and crushing, thereby obtaining a high-magnesium nodulizer finished product, of which the content of Mg reaches 25-42%. The high-magnesium nodulizer prepared by the method is composite alloy which is smelted from magnesium, silicon, calcium, barium, rare earth and ferrum according to a scientific proportioning ratio and method; due to the scientific raw material proportioning ratio, high pouring speed and nitrogen gas protection assistance, the content of magnesium oxide (MgO) in the finished product nodulizer is low and is lower than 1.0%, when in use as a nodulizing agent, the desulfurization rate is high and can reach over 30%, the magnesium recovery rate is high and can reach over 30%, the production cost is reduced greatly, and the quality of product is increased.
Description
Technical field
The present invention relates to metallurgical technology field, especially relate to a kind of for desulfurizing iron, nodularization, the smelting process breeding the magnesium-rich pellet agent that triple role uses and the cored-wire adopting this nodulizing agent to make for core body.
Background technology
Still adopt magnesium-rare earth nodulizing agent to pour method during the centrifugal spheroid pipe of current casting to process, though this kind pours method have many advantages such as the anti-ageing ability of moving back is strong, but maximum shortcoming is that the quantity of slag produced is larger, the bits proportion generated is close with the proportion of molten iron, what meeting was a large amount of is suspended in molten iron, is not easy to separate with molten iron.The rare earth slag simultaneously separated can form one deck scum layer at cast(ing) surface, causes casting quality to decline, and mechanical property is unstable, and finished product cast easily occurs drainage when water-pressure sealed is tested.
Traditional nodulizing agent is that the raw materials such as MAGNESIUM METAL, rare earth, ferrosilicon, silico-calcium, silicon barium, steel scrap are added intermediate frequency furnace according to a certain percentage, after fully melting, pour the cooling of mould pond into form, wherein Mg content controls 5 ~ 10%, this is due in the ordinary course of things, in nodulizing agent, magnesian content can increase with the increase of Mg content, and magnesian content is higher, unfavorable to the use of product.Although the production method of low magnesium nodulizer is comparatively simple, during process molten iron, usage quantity is comparatively large, and the recovery rate of magnesium again lower (less than 14%), causes production cost high.
Summary of the invention
The object of the present invention is to provide a kind of Mg content high but the smelting process of the wherein magnesium-rich pellet agent that content of magnesia is low, the present invention also provides the cored-wire utilizing this nodulizing agent to make for core body.
For achieving the above object, the present invention can take following technical proposals:
The smelting process of magnesium-rich pellet agent of the present invention, comprises the steps:
The first step, takes metal MAG block 35 parts respectively, ferrosilicon powder 44 ~ 51 parts, calcium metal block 2.5 parts, group of the lanthanides pure rare earth 2.3 parts, Si-Ba alloy 9 parts;
Second step, first drops in intermediate frequency furnace by ferrosilicon powder, is incubated melting 25-30 minute after being warming up to 1200 ~ 1400 DEG C;
3rd step, adds in intermediate frequency furnace by calcium metal block, Si-Ba alloy, to fully fusing;
4th step, adds in intermediate frequency furnace by metal MAG block, group of the lanthanides pure rare earth, to fully fusing;
5th step; under nitrogen protection; in one minute, the alloy molten solution in intermediate frequency furnace is poured in the mould with anti-oxidation cover, after being down to normal temperature fragmentation, magnesium-rich pellet agent finished product can be obtained; in described magnesium-rich pellet agent finished product, the mass percent of each component is: Mg 25 ~ 42%; Re 1 ~ 4%, Ca 1 ~ 4%, Si 40 ~ 48%; Ba 2 ~ 3% MgO < 1.0%, surplus is Fe.
Mg >=99% in described metal MAG block; Si >=75% in ferrosilicon powder; Re >=99% in group of the lanthanides pure rare earth; The granularity of calcium metal block is 1 ~ 30mm, Ca >=99%; Ba > 28% in Si-Ba alloy.
Calcium metal block wherein can be replaced with silicocalcium, Ca >=28% in silicocalcium, and consumption can convert according to the calcium metal block consumption in the first step.
The magnesium-rich pellet agent that the present invention smelts can be used as powder core and makes cored-wire, and be coated with steel belt layer in described powder core outside, the thickness of described steel belt layer is 0.35 ~ 0.45mm, and weight is 150 ~ 194g/m, and the weight of described magnesium-rich pellet agent powder core is 230 ~ 260g/m; Obtained finished product cored-wire diameter is 10 ~ 16mm.
Magnesium-rich pellet agent of the present invention is the composite alloy smelted according to proportioning and the method for science by MAGNESIUM METAL, silicon, calcium, barium, rare earth and iron; due to proportioning raw materials science; pour into a mould quick and be aided with nitrogen protection; so content of magnesia low (MgO < 1.0%) in finished ball agent; when using as nodulizing agent; desulfurization degree is high and the magnesium rate of recovery is high (can reach more than 30%), greatly reduces production cost, improves quality product.
Embodiment
Below by specific embodiment, the present invention will be further described.
embodiment 1
The smelting process of magnesium-rich pellet agent of the present invention comprises the steps:
The first step, takes metal MAG block 35 parts by weight respectively; Ferrosilicon powder 51 parts; Calcium metal block 2.5 parts; Group of the lanthanides pure rare earth 2.5 parts, Si-Ba alloy 9 parts; Wherein the particle diameter of calcium metal block is 1 ~ 30mm, and as undersized, high temperature solution can cause the scaling loss of calcium constituent;
Second step, first drops into ferrosilicon powder in GWJ0.5 ton intermediate frequency furnace, is incubated melting 27 minutes after being warming up to 1200 ~ 1400 DEG C;
3rd step, adds in intermediate frequency furnace by calcium metal block, Si-Ba alloy, to fully fusing;
4th step, adds in intermediate frequency furnace by metal MAG block, group of the lanthanides pure rare earth, to fully fusing;
5th step; under nitrogen protection, fast the alloy molten solution in intermediate frequency furnace is poured in the mould with anti-oxidation cover in one minute, after being down to normal temperature; jaw crusher or high-efficiency vertical crusher is adopted to be broken into the fines of below 3mm; obtain magnesium-rich pellet agent finished product, in this magnesium-rich pellet agent finished product, the mass percent of each component is Mg 34.13%, Re 2.24%; Ca 2.57%; Si 44.20%, Ba 2.52% MgO 0.69%, surplus is Fe.
In raw materials used, Mg content >=99% in metal MAG block, Si content >=75% in ferrosilicon powder.Re >=99% in group of the lanthanides pure rare earth, Ca >=99% in calcium metal block.
Choice for use GB GB/T699-1999 carbon constructional quality steel, as the outer cladding steel band of cored-wire, adopts cored-wire machine to be rolled into cored-wire finished product.The specification of finished product magnesium-rich pellet agent cored-wire is:
As required, magnesium-rich pellet agent cored-wire wire diameter can also make the cored-wire of 10 ~ 16mm, does not repeat them here.
embodiment 2
The smelting process of magnesium-rich pellet agent of the present invention, it comprises the steps:
The first step, takes feed metal MAG block 35 parts respectively; Ferrosilicon powder 44.5 parts; Silicocalcium 9 parts; Group of the lanthanides pure rare earth 2.5 parts, Si-Ba alloy 9 parts;
Second step, first drops into ferrosilicon powder in GWJ0.5 ton intermediate frequency furnace, melting 27 minutes after being warming up to 1200 ~ 1400 DEG C;
3rd step, adds in intermediate frequency furnace by silicocalcium, Si-Ba alloy, to fully fusing;
4th step: add in intermediate frequency furnace by metal MAG block, group of the lanthanides pure rare earth, to fully fusing;
5th step; under nitrogen protection, fast the alloy molten solution in intermediate frequency furnace is poured in the mould with anti-oxidation cover in one minute, adopt jaw crusher or high-efficiency vertical crusher to be broken into the fines of below 3mm; obtain magnesium-rich pellet agent finished product; in this magnesium-rich pellet agent finished product, the mass percent of each component is: Mg 32.93%, Re 2.12%, Ca 2.72%; Si 43.05%; Ba 2.34%, MgO 0.73%, surplus is Fe.
In above-mentioned raw materials, Mg content >=99% in metal MAG block, Si content >=75% in ferrosilicon powder, Re >=99% in group of the lanthanides pure rare earth, Ca >=28% in silicocalcium.
Equally, choice for use GB GB/T699-1999 carbon constructional quality steel, as the outer cladding steel band of cored-wire, adopts cored-wire machine to be rolled into cored-wire finished product.The specification of finished product magnesium-rich pellet agent cored-wire is:
As required, magnesium-rich pellet agent cored-wire wire diameter can also make the cored-wire of 10 ~ 16mm, does not repeat them here.
Index reference raw materials used in the present invention:
MAGNESIUM METAL: Mg >=99.95; Fe≤0.004; Si≤0.005; N≤0.0007; Cu≤0.003;
Al≤0.006；Cl≤0.003；Mn≤0.01；Ti ≤0.014
Calcium metal: Ca >=99, N≤0.1, C≤0.35, Mg≤0.30, Cu≤0.08, Ni≤0.004,
Mn≤0.02，Si≤0.01，Fe ≤0.04，Al≤0.01；
Ferrosilicon powder: FeSi75-A:Si >=75, Mn≤0.4, Cr≤0.3, P≤0.035, S≤0.02, C≤0.1;
Group of the lanthanides pure rare earth: REO >=99%, CuO≤0.0002, NiO≤0.0002, PbO≤0.0020, caustic soda≤1;
Silicocalcium: Ca >=28%; Si >=50%; Al≤2.4%; C≤1%; S≤0.05%; P≤0.04%.
Si-Ba alloy: S≤0.04, P≤0.04, C≤0.30, Mn≤0.40, Al≤3.0, Si >=35, Ba >=30
Following table 1 is the record that a centrifugal spheroid pipe order of classes or grades at school cast by the nodulizing agent (trade mark 195103D, Mg content 8.5%, unit price 9000 yuan/ton) adopting certain factory to produce:
Table 1
The record of table 2 for adopting the nodulizing agent (reference price 11900 yuan/ton) of the present invention's production to cast a centrifugal spheroid pipe order of classes or grades at school.
Table 2
Contrast table 1, table 2 can be found out, magnesium recovery rate can be increased to 28.23% by 11.97%, and ton molten iron nodulizing agent cost can be down to 11.25 yuan by 73.01 yuan, because the consumption of nodulizing agent reduces, greatly reduces the production cost of cast tube.The magnesium-rich pellet agent that the present invention simultaneously smelts can be made into cored-wire, directly squeezes in hot metal ladle by feeding wire machine, can reduce again the smoke contamination in production, reduce the labour intensity of workman during use.
Claims (3)
1. a smelting process for magnesium-rich pellet agent, is characterized in that: comprise the steps:
The first step, takes metal MAG block 35 parts respectively, ferrosilicon powder 44 ~ 51 parts, calcium metal block 2.5 parts, group of the lanthanides pure rare earth 2.3 parts, Si-Ba alloy 9 parts;
Second step, first drops in intermediate frequency furnace by ferrosilicon powder, is incubated melting 25-30 minute after being warming up to 1200 ~ 1400 DEG C;
3rd step, adds in intermediate frequency furnace by calcium metal block, Si-Ba alloy, to fully fusing;
4th step, adds in intermediate frequency furnace by metal MAG block, group of the lanthanides pure rare earth, to fully fusing;
5th step; under nitrogen protection; in one minute, the alloy molten solution in intermediate frequency furnace is poured in the mould with anti-oxidation cover, after being down to normal temperature fragmentation, magnesium-rich pellet agent finished product can be obtained; in described magnesium-rich pellet agent finished product, the mass percent of each component is: Mg 25 ~ 42%; Re 1 ~ 4%, Ca 1 ~ 4%, Si 40 ~ 48%; Ba 2 ~ 3% MgO < 1.0%, surplus is Fe.
2. the smelting process of magnesium-rich pellet agent according to claim 1, is characterized in that: Mg >=99% in described metal MAG block; Si >=75% in ferrosilicon powder; Re >=99% in group of the lanthanides pure rare earth; The granularity of calcium metal block is 1 ~ 30mm, Ca >=99%; Ba >=28% in Si-Ba alloy.
3. adopt magnesium-rich pellet agent according to claim 1 to be the cored-wire that core body is made, it is characterized in that: described cored-wire is smelted the coated steel belt layer of the magnesium-rich pellet agent powder core that obtains and outside by the present invention and formed, the thickness of described steel belt layer is 0.35 ~ 0.45mm, weight is 150 ~ 194g/m, and the weight of described magnesium-rich pellet agent powder core is 230 ~ 260g/m; Finished product cored-wire diameter is 10 ~ 16mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576432A (en) * | 2018-11-11 | 2019-04-05 | 三祥新材（宁夏）有限公司 | A kind of novel spheroidized core wire and preparation method |
| CN110205433A (en) * | 2019-07-12 | 2019-09-06 | 黄石东贝铸造有限公司 | A kind of no rare earth spheroidized core wire and its application in spheroidal graphite casting |
| CN110791612A (en) * | 2019-11-13 | 2020-02-14 | 三祥新材股份有限公司 | Pure lanthanum rare earth spheroidized core-spun yarn and preparation method thereof |
| CN111411187A (en) * | 2020-05-18 | 2020-07-14 | 三祥新材股份有限公司 | Magnesium-silicon-iron alloy nodulizer and preparation method thereof |
| CN113430325A (en) * | 2021-07-01 | 2021-09-24 | 南京浦江合金材料股份有限公司 | Spheroidized core-spun yarn containing barium and lanthanum and cold preparation process thereof |
| CN114854926A (en) * | 2022-03-24 | 2022-08-05 | 江苏亚峰合金材料有限公司 | Environment-friendly nodulizer for low-silicon nodular cast iron |
-
2015
- 2015-05-04 CN CN201510220124.5A patent/CN104789848A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576432A (en) * | 2018-11-11 | 2019-04-05 | 三祥新材（宁夏）有限公司 | A kind of novel spheroidized core wire and preparation method |
| CN110205433A (en) * | 2019-07-12 | 2019-09-06 | 黄石东贝铸造有限公司 | A kind of no rare earth spheroidized core wire and its application in spheroidal graphite casting |
| CN110791612A (en) * | 2019-11-13 | 2020-02-14 | 三祥新材股份有限公司 | Pure lanthanum rare earth spheroidized core-spun yarn and preparation method thereof |
| CN111411187A (en) * | 2020-05-18 | 2020-07-14 | 三祥新材股份有限公司 | Magnesium-silicon-iron alloy nodulizer and preparation method thereof |
| CN113430325A (en) * | 2021-07-01 | 2021-09-24 | 南京浦江合金材料股份有限公司 | Spheroidized core-spun yarn containing barium and lanthanum and cold preparation process thereof |
| CN114854926A (en) * | 2022-03-24 | 2022-08-05 | 江苏亚峰合金材料有限公司 | Environment-friendly nodulizer for low-silicon nodular cast iron |
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