CN104212946B - The large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine - Google Patents
The large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine Download PDFInfo
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- CN104212946B CN104212946B CN201410471330.9A CN201410471330A CN104212946B CN 104212946 B CN104212946 B CN 104212946B CN 201410471330 A CN201410471330 A CN 201410471330A CN 104212946 B CN104212946 B CN 104212946B
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- Prior art keywords
- slag
- stainless steel
- foundry goods
- molten steel
- carbon stainless
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 15
- 239000010935 stainless steel Substances 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000003723 Smelting Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 238000005261 decarburization Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 abstract description 16
- 238000005266 casting Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 241001417490 Sillaginidae Species 0.000 abstract 1
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention discloses a kind of large-scale Ultralow Carbon Stainless Steel foundry goods Novel smelting method of water turbine, relates to single station heating refining furnace and smelts the large-scale Ultralow Carbon Stainless Steel method for casting of three ladle combined castings.Basic skills controls molten steel recarburization, respectively three guarantees molten steel accomplished that separately composition is qualified, temperature is appropriate.By controlling slag heat retaining property, reaching three guarantees molten steel composition, temperature and jointly meeting casting quality requirement.Present method has a extensive future for only having the small-sized steel foundry of single heating station.Can ensure the quality of production of large-scale Ultralow Carbon Stainless Steel foundry goods, social and economic effects is remarkable.
Description
Technical field
The present invention relates to single station heating refining furnace and smelt the large-scale Ultralow Carbon Stainless Steel method for casting of three ladle combined castings.
Background technology
Traditional water turbine is completed by large-scale refining furnace primary smelting with the production of large-scale Ultralow Carbon Stainless Steel foundry goods, and Ye You producer uses double heating refining furnace to produce such foundry goods.Above-mentioned two kinds have ripe smelting process.But for middle-size and small-size steel foundry, due to scale restriction, and consider that the diversity of cast steel product and the use cost of Large-Scale Equipment and utilization ratio do not invest to build large-scale or double heating refining furnace, only have single station to heat refining furnace.Through update search, do not find only to have the production method that single station heating refining furnace producer used the large-scale Ultralow Carbon Stainless Steel foundry goods of three ladle combined castings.
Summary of the invention
The present invention seeks to be adjusted by refinery practice and control slag, three guarantees molten steel is all adjusted to composition qualified, temperature reaches cast requirement, jointly pours into a mould, and produces the large-scale Ultralow Carbon Stainless Steel foundry goods meeting technical requirements.The present invention seeks to be achieved through the following technical solutions:
1) the dark decarburization of first Baogang's water vacuum oxygen, stop oxygen when again reaching 6% after oxygen concn is made zero, continue to vacuumize, vacuum tightness keeps 30 minutes below 100 pascals, make first time oxygen decarburization after vacuum-treat, in steel, carbon content is below 0.015%.Residue adjustment after the degassed end of secondary vacuum, to make in slag alumina content between 35 ~ 45%, the slag of in bag 70% is removed after being warming up to 1680 DEG C, make the slag containing calcium oxide 55 ~ 65%, silicon oxide 18 ~ 22%, aluminum oxide 15 ~ 25%, the quantity of slag is 8 ~ 10% of molten steel amount, temperature enters insulation station 1720 ~ 1740 DEG C time, adds heat preserving agent and wait for when the top of the slag stablizes micro-crust;
2) carbon controls below 0.018% after terminating by second Baogang's water first time oxygen decarburization, the slag containing calcium oxide 55 ~ 65%, silicon oxide 18 ~ 22%, aluminum oxide 15 ~ 25% is made after the degassed end of secondary vacuum, the quantity of slag is 6 ~ 8% of molten steel amount, temperature raising, liquid steel temperature hangs out wait after reaching 1640 ~ 1660 DEG C;
3) three guarantees molten steel is normally smelted, and fine setting temperature is mated with Qian Liang Baogang water temp, and jointly pour into a mould, above-mentioned steps is the large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine.
Technique effect
The invention solves following problem:
1, effectively control carbon content of molten steel to exceed standard: measure of control be refining early stage by guaranteeing the dark decarburization of molten steel to Molten Steel over-oxidation, lengthening vacuum carbon deoxidization time, the factor carburetting avoided for technique is bad reserves carburetting space; Later stage makes the larger slag of density, and electrode carburetting when effectively preventing power transmission temperature raising, ensures the Ultra-low carbon requirement of molten steel.
2, effectively controlling molten steel cooling rate: the smelting later stage makes the good slag of heat retaining property and is incubated the molten steel first smelting end, control first to smelt the cooling rate terminating molten steel, making three guarantees molten steel temperature when pouring into a mould all reach specified temperature.
The production method that large-scale refining furnace is taked is whole molten steel that large-scale Ultralow Carbon Stainless Steel foundry goods needs smelted by single stove, and production technique is relatively simple, and control process also more easily completes, but equipment investment cost is very large, and refractory consumption rate is also high.Double heating refining furnace is produced, and is a station vacuum refinement, another station heating and thermal insulation, and equipment also more single station heating refining furnace wants large.The present invention ensures the quality of production by equipment, but is reached the specification of quality of product by meticulous process control.
The present invention can use small-sized refining furnace to produce massive casting, and can save equipment investment, improve small-sized refining furnace utilization ratio, small-sized refining unit continuous seepage also can save refractory consumption rate.The present invention can ensure the quality of production of large-scale Ultralow Carbon Stainless Steel foundry goods, and social and economic effects is remarkable.
Embodiment
The present invention is that the large-scale Ultralow Carbon Stainless Steel method for casting of three ladle combined castings smelted by single station heating refining furnace:
1) the dark decarburization of the first bag liquid steel refining, controls carbon below 0.015% after carbon deoxidation terminates.Make the slag that alumina content is 35 ~ 45% after the degassed end of secondary vacuum, after temperature raising, when liquid steel temperature reaches 1680 DEG C, remove the slag of about 70%, make the slag of good heat insulating.Temperature enters insulation station 1720 ~ 1740 DEG C time, adds heat preserving agent and wait for when the top of the slag stablizes micro-crust.
2) carbon controls below 0.018% after terminating by the water carbon deoxidation of the second Baogang, and make insulation slag, temperature raising after the degassed end of secondary vacuum, liquid steel temperature hangs out wait after reaching 1640 ~ 1660 DEG C.
3) three guarantees molten steel is normally smelted, and fine setting temperature is mated with Qian Liang Baogang water temp.Common cast.
Claims (1)
1. the large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine, is characterized in that: under single heating station condition, this processing step is as follows:
1) the dark decarburization of first Baogang's water vacuum oxygen, stop oxygen when again reaching 6% after oxygen concn is made zero, continue to vacuumize, vacuum tightness keeps 30 minutes below 100 pascals, make first time oxygen decarburization after vacuum-treat, in steel, carbon content is below 0.015%; Residue adjustment after the degassed end of secondary vacuum, to make in slag alumina content between 35 ~ 45%, the slag of in bag 70% is removed after being warming up to 1680 DEG C, make the slag containing calcium oxide 55 ~ 65%, silicon oxide 18 ~ 22%, aluminum oxide 15 ~ 25%, the quantity of slag is 8 ~ 10% of molten steel amount, temperature enters insulation station 1720 ~ 1740 DEG C time, adds heat preserving agent and wait for when the top of the slag stablizes micro-crust;
2) carbon controls below 0.018% after terminating by second Baogang's water first time oxygen decarburization, the slag containing calcium oxide 55 ~ 65%, silicon oxide 18 ~ 22%, aluminum oxide 15 ~ 25% is made after the degassed end of secondary vacuum, the quantity of slag is 6 ~ 8% of molten steel amount, temperature raising, liquid steel temperature hangs out wait after reaching 1640 ~ 1660 DEG C;
3) three guarantees molten steel is normally smelted, and fine setting temperature is mated with Qian Liang Baogang water temp, and jointly pour into a mould, above-mentioned steps is the large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471330.9A CN104212946B (en) | 2014-09-16 | 2014-09-16 | The large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471330.9A CN104212946B (en) | 2014-09-16 | 2014-09-16 | The large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine |
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| Publication Number | Publication Date |
|---|---|
| CN104212946A CN104212946A (en) | 2014-12-17 |
| CN104212946B true CN104212946B (en) | 2016-02-10 |
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| CN201410471330.9A Expired - Fee Related CN104212946B (en) | 2014-09-16 | 2014-09-16 | The large-scale Ultralow Carbon Stainless Steel foundry goods smelting process of water turbine |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120599A (en) * | 1994-06-17 | 1996-04-17 | 株式会社日立制作所 | 13CrSNi series stainless steel with high toughness and application of same |
| CN102107260A (en) * | 2010-12-07 | 2011-06-29 | 陕西宏远航空锻造有限责任公司 | Method for casting large-scale K403 high-temperature alloy die for isothermal forging |
| CN103184391A (en) * | 2013-03-22 | 2013-07-03 | 北京科技大学 | Annular plate steel used for top cover of million-kilowatt-level large-scale hydraulic turbine and manufacturing method thereof |
-
2014
- 2014-09-16 CN CN201410471330.9A patent/CN104212946B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120599A (en) * | 1994-06-17 | 1996-04-17 | 株式会社日立制作所 | 13CrSNi series stainless steel with high toughness and application of same |
| CN102107260A (en) * | 2010-12-07 | 2011-06-29 | 陕西宏远航空锻造有限责任公司 | Method for casting large-scale K403 high-temperature alloy die for isothermal forging |
| CN103184391A (en) * | 2013-03-22 | 2013-07-03 | 北京科技大学 | Annular plate steel used for top cover of million-kilowatt-level large-scale hydraulic turbine and manufacturing method thereof |
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| CN104212946A (en) | 2014-12-17 |
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