CN101092673A - Refining technique for manufacturing pieces of vermicular cast iron - Google Patents
Refining technique for manufacturing pieces of vermicular cast iron Download PDFInfo
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- CN101092673A CN101092673A CN 200610044919 CN200610044919A CN101092673A CN 101092673 A CN101092673 A CN 101092673A CN 200610044919 CN200610044919 CN 200610044919 CN 200610044919 A CN200610044919 A CN 200610044919A CN 101092673 A CN101092673 A CN 101092673A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
This invention discloses a technique for refining vermicular cast iron. The technique comprises: directly flowing molten iron of blast furnace into a middle-frequency induction furnace, vermicularizing, and casting. The technique has such advantages as little pollution, low energy consumption, low cost (reduced by 150 yen/ton cast), stable vermicularizing rate, high product performance and high production efficiency (increased by more than 50%).
Description
Technical field
Refining technique for manufacturing pieces of vermicular cast iron belongs to casting technology field.
Background technology
The technology of current domestic preparation vermicular cast iron base iron has following three kinds:
First kind: with the solid-state pig fusing that cupola furnace is produced blast furnace, the overheated one-tenth iron base iron of wriggling;
Second kind: with the solid-state pig fusing that medium-frequency induction furnace is produced blast furnace, the overheated one-tenth iron base iron of wriggling;
The third: after the solid-state pig fusing of cupola furnace, advance the overheated iron base iron of wriggling that is refined into of medium-frequency induction furnace again with blast furnace production;
There is following shortcoming in above technology:
1, energy consumption is big
As Figure 1-3: the solid-state pig fusing of adopting first kind of cupola furnace that blast furnace is produced, the overheated one-tenth iron base iron of wriggling; Produce many consumes energy of base iron 1363263kcal/t per ton, and seriously polluted; The solid-state pig fusing of adopting medium-frequency induction furnace that blast furnace is produced, the overheated one-tenth iron base iron of wriggling; Or, advance the overheated iron base iron of wriggling that is refined into of medium-frequency induction furnace again with after the solid-state pig fusing of cupola furnace with blast furnace production; First and third two kinds of technology are discharged a large amount of carbonoxide CO, carbonic acid gas CO in air
2, sulfur oxide SO, sulfurous gas SO
2Reach pollutents such as dust, and noise is big.
2, molten steel quality is poor
Adopt the base iron of first and third kind of technology production, in fusion process, melted into the S of some amount, account for base iron greatly and contain more than 40% of S amount.Therefore, need the vermiculizers that add more than 40% more, make the control instability of vermicular cast iron nodulizing rate.
3, the consumption of metallic element scaling loss is big
First and third kind of many scaling loss of technology consumes metallic element 20～25%.
Summary of the invention
In order to solve the problem that prior art exists, the invention provides and a kind ofly reduce the melting production cost, cut down the consumption of energy, enhance productivity and reduces secondary pollution, reach the concise manufacture craft of pieces of vermicular cast iron of protection requirement.
The present invention solves the technical scheme that problem adopted that prior art exists: this refining technique for manufacturing pieces of vermicular cast iron: comprise blast-melted--wriggling processing--pouring cast part is characterized in that: blast-meltedly directly enter the medium-frequency induction furnace refining.Saved first with the blast-melted processing step that produces the solid-state pig iron, and through having improved the quality of molten iron after the medium-frequency induction furnace refining.
1480 ℃～1500 ℃ of medium-frequency induction furnace refining temperatures, insulation 10 minutes.Purpose is to eliminate inherited genetic factors.
Wriggling treatment temp is stabilized in 1420 ℃～1450 ℃ scopes.
Main effect is to eliminate the molten iron inherent defect, guarantees the quality of molten iron, is convenient to pouring cast part.
Comparing the beneficial effect that the present invention has with former Technology is: owing to blast-meltedly directly enter the medium-frequency induction furnace refining.Saved first with the blast-melted processing step that produces the solid-state pig iron, and through having improved the quality of molten iron after the medium-frequency induction furnace refining.
1, reduces pollution, cut down the consumption of energy significantly, have obvious social.
2, reduced production cost, estimated that foundry goods per ton reduces cost 150 yuan.
3, improve cast properties, stablized nodulizing rate;
4, improve productivity effect more than 50%.
Description of drawings
Fig. 1 is that the various smelting furnace of prior art are at preheating, fusion stage figure;
Fig. 2 is the thermo-efficiency figure in various overheated stages of smelting furnace of prior art;
Fig. 3 is the required heat diagram of cast iron in preheating, fusing, overheated stage.
Embodiment
Embodiment:
1, molten iron is transported to the medium-frequency induction furnace refining.
2, taked pre-desulfurization technology before the State of Blast Furnace, make into that the sulphur content of the molten iron of electric furnace is stabilized in≤0.03%.
3, the medium-frequency induction furnace refining temperature is 1480 ℃～1500 ℃, is incubated 10 minutes.Add steel scrap, alloying element simultaneously.The medium-frequency induction furnace refining temperature also can be higher than 1500 ℃ in the production.Mainly waste energy.
4, wriggling treatment temp is stabilized in 1420 ℃～1450 ℃ scopes.
Concrete technical process:
Blast-furnace smelting → molten iron transportation → spectroscopic analysis chemical ingredients → electric furnace refining → wriggling processing → stokehold check (nodulizing rate detector) → skim → breed → cast.
Produce pieces of vermicular cast iron with short flow process, under the situation identical with the base iron chemical ingredients, can improve mechanical property more than 2%, nodulizing rate is stabilized in more than 70%, save energy, raises the efficiency, reduces cost, reduces environmental pollution.Detected result relatively sees Table 1:
Mechanical property and metallographic contrast table under table 1 and the molten iron chemical ingredients same case
| Technology | Base iron chemical ingredients (%) | Mechanical property | Metallographic | |||||
| C | Si | Mn | P | S | σ b(MPa)) | δ(％) | Nodulizing rate | |
| Former Technology | 3.2～ 3.7 | 0.5～ 0.8 | ≤0.07 | ≤0.07 | 330～350 | 0.5～ 1.0 | ≥50％ | |
| Short flow process | 3.2～ 3.7 | 0.5～ 0.8 | ≤0.07 | ≤0.03 | 350～380 | 1～3 | ≥70％ | |
Claims (3)
1, refining technique for manufacturing pieces of vermicular cast iron comprises blast-meltedly, and to the processing of wriggling of molten iron, pouring cast part is characterized in that: blast-meltedly directly enter the medium-frequency induction furnace refining.
2, refining technique for manufacturing pieces of vermicular cast iron according to claim 1 is characterized in that: 1480 ℃～1500 ℃ of medium-frequency induction furnace refining temperatures, insulation 10 minutes.
3, refining technique for manufacturing pieces of vermicular cast iron according to claim 1 is characterized in that: be stabilized in 1420 ℃～1450 ℃ scopes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610044919 CN101092673A (en) | 2006-06-19 | 2006-06-19 | Refining technique for manufacturing pieces of vermicular cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610044919 CN101092673A (en) | 2006-06-19 | 2006-06-19 | Refining technique for manufacturing pieces of vermicular cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101092673A true CN101092673A (en) | 2007-12-26 |
Family
ID=38991106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610044919 Pending CN101092673A (en) | 2006-06-19 | 2006-06-19 | Refining technique for manufacturing pieces of vermicular cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101092673A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555565B (en) * | 2008-04-11 | 2011-05-18 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
| CN102304602A (en) * | 2011-08-23 | 2012-01-04 | 林州市银桥机械制造有限公司 | Vermicular cast iron produced through short process production, production method and application thereof |
| CN104404359A (en) * | 2014-10-20 | 2015-03-11 | 广东美芝制冷设备有限公司 | Compression mechanism, preparation method of compression mechanism, compressor and refrigeration device |
-
2006
- 2006-06-19 CN CN 200610044919 patent/CN101092673A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555565B (en) * | 2008-04-11 | 2011-05-18 | 广西玉柴机器股份有限公司 | Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting |
| CN102304602A (en) * | 2011-08-23 | 2012-01-04 | 林州市银桥机械制造有限公司 | Vermicular cast iron produced through short process production, production method and application thereof |
| CN104404359A (en) * | 2014-10-20 | 2015-03-11 | 广东美芝制冷设备有限公司 | Compression mechanism, preparation method of compression mechanism, compressor and refrigeration device |
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