CN1031868C - Process method for producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron - Google Patents
Process method for producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron Download PDFInfo
- Publication number
- CN1031868C CN1031868C CN 93100717 CN93100717A CN1031868C CN 1031868 C CN1031868 C CN 1031868C CN 93100717 CN93100717 CN 93100717 CN 93100717 A CN93100717 A CN 93100717A CN 1031868 C CN1031868 C CN 1031868C
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- China
- Prior art keywords
- molten iron
- ingot mould
- steel ingot
- nitrogen
- blast furnace
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The present invention relates to a technique for producing a steel ingot mould by blowing nitrogen to treat blast furnace molten iron. In the technique, nitrogen is blown into a molten iron tank containing molten iron before the ingot mould is cast, which can inhibit the precipitation of graphite in the molten iron, and stabilize the composition of the molten iron. The composition and the temperature of the molten iron which are uniformly stirred promote the upward floating of slag inclusions and inclusions in the molten iron under the action of nitrogen-blowing stirring so as to increase the successful rate of casting and simultaneously enhance the quality of the steel ingot mould. The high-temperature strength of the steel ingot mould cast by the technique can be increased by 10 to 15%, the threshold value of fatigue crack extension can be increased by more than 30%, and the mould consumption can be reduced by 1.52 kg/t steel.
Description
The present invention relates to a kind of process of handling blast-melted production ingot mould, belong to foundry cast iron water and give processing technology field.
Cast iron matter ingot mould is the important tool of STEELMAKING PRODUCTION, and the quality of ingot mould quality will directly influence the quality of STEELMAKING PRODUCTION technical-economic index.And the factor that is decided by the ingot mould quality also has direct relation with the foundry cast iron water quality except that outside the Pass having with foundry engieering.
Before the present invention makes, the process of conventional production ingot mould is that direct pouring becomes ingot mould after pouring blast furnace or cupola furnace molten iron into hot-metal bottle, because the phosphorus content of molten iron is higher, tap a blast furnace to casting process at blast furnace or cupola furnace, variation along with molten iron temperature, carbon wherein will constantly be separated out with the flaky graphite form, thereby hot metal composition is changed, simultaneously also because of molten iron temperature inequality in the hot-metal bottle, being mingled with of including can not finely be got rid of, make that the ingot mould that casts out is second-rate, waste product is more.
The object of the present invention is to provide a kind of processing method of giving of foundry cast iron water, so as to improving graphite form and distribution in the molten iron, that suppresses carbon separates out mixing temperature and composition, the come-up and the eliminating that are mingled with in the promotion molten iron, thereby the comprehensive quality of raising cast steel ingot mould.
The process of producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron of the present invention, exactly blast-melted pour hot-metal bottle into after and the centre of cast ingot mould add one in the hot-metal bottle that fills molten iron the nitrogen blowing operation, this nitrogen blowing can be carried out top blast or carry out bottom blowing by air brick by spray gun, and the pressure of its air feed and flow are decided on the size of hot-metal bottle volume.The main effect of nitrogen blowing is stirred exactly in molten iron, and this stirring can make the graphite tip rust in the molten iron, suppresses its gathering and separates out, thereby stablize hot metal composition; This stirring makes molten iron temperature and the composition mixing in the hot-metal bottle, improves the internal soundness of molten iron; This stirring can promote assorted slag and the come-up that is mingled with in the molten iron, improves the degree of purity of molten iron.
The foregoing of the process of producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron of the present invention and effect thereof further specify as follows in conjunction with the embodiments:
Certain roll factory of iron company of China adopts process of the present invention nitrogen blowing in blast-melted in the production of the big flat Ingot Mold of casting F * 10.5t, its technological process is
Blast furnace casting-→ 100
tHot-metal bottle-→ 20
tHot-metal bottle-→ 20
tHot-metal bottle bottom blowing nitrogen-→ cast F * 10.5t ingot mould
The pressure of its nitrogen blowing is 0.1～0.5MPa, and flow is 0.1～0.8m
3(standard)/min.Drop to 3～5 grades with cast out the cast iron eutectic cell of ingot mould of this process by original 5～7 grades, elevated temperature strength improves 10～15%.The crack Propagation threshold value improves more than 30%.The ingot mould that uses process of the present invention to cast out, its mould consumption reduces the 1.52kg/t steel, improves 10.73% actual life.
Claims (2)
1, the process of the blast-melted production ingot mould of a kind of usefulness is characterized in that being blown into nitrogen in teeming mould forward direction fills the hot-metal bottle of molten iron.
2, the process of the blast-melted production ingot mould of usefulness according to claim 1 is characterized in that the nitrogen blowing in hot-metal bottle is carried out top blast or carried out bottom blowing by air brick by spray gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93100717 CN1031868C (en) | 1993-01-08 | 1993-01-08 | Process method for producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93100717 CN1031868C (en) | 1993-01-08 | 1993-01-08 | Process method for producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1076394A CN1076394A (en) | 1993-09-22 |
| CN1031868C true CN1031868C (en) | 1996-05-29 |
Family
ID=4983183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93100717 Expired - Fee Related CN1031868C (en) | 1993-01-08 | 1993-01-08 | Process method for producing steel ingot mould by blowing nitrogen to treat blast furnace molten iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031868C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804535B (en) * | 2010-03-25 | 2011-10-19 | 河北五维航电科技有限公司 | Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity |
| CN104275450B (en) * | 2014-10-11 | 2016-05-18 | 清华大学 | A kind of method of bottom pouring type pouring ingot casting and special purpose device |
-
1993
- 1993-01-08 CN CN 93100717 patent/CN1031868C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1076394A (en) | 1993-09-22 |
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Legal Events
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |