CN101760580B - Manufacturing method of high-temperature resistant and creep-resistant cast steel - Google Patents
Manufacturing method of high-temperature resistant and creep-resistant cast steel Download PDFInfo
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- CN101760580B CN101760580B CN2009102012816A CN200910201281A CN101760580B CN 101760580 B CN101760580 B CN 101760580B CN 2009102012816 A CN2009102012816 A CN 2009102012816A CN 200910201281 A CN200910201281 A CN 200910201281A CN 101760580 B CN101760580 B CN 101760580B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a manufacturing method of a high-temperature resistant and creep-resistant cast steel. A basic electric arc furnace is adopted for smelting, a steel ladle maintaining furnace is refined in an argon blowing mode, and argon protects pouring to produce the high-temperature resistant and creep-resistant cast steel. The specific steps are as follows: (1) adopting the basic electric arc furnace for smelting, which comprises: selecting furnace burden, dephosphorizing during the melting period, decarbonising during the oxidizing period, keeping reducing slag and strengthening deoxidation residual force; (2) after smelted by the electric furnace, entering the steel ladle maintaining furnace for argon blowing and refining; (3) controlling the pouring speed and the pouring temperature of the creep-resistant cast steel. The invention has the beneficial effect that the high temperature resistant and creep-resistant cast steel can be produced under the condition of no vacuum smelting equipment, optimizes classical steelmaking technology, reduces equipment investment, does not occupy production sites and has small energy consumption; the manufacturing method can produce novel high temperature resistant and creep-resistant cast steel conforming to the European standard, and realizes the localization production of creep-resistant cast steel of million Kw super-critical turbines and large gas turbines.
Description
[technical field]
The invention belongs to casting technology field, concrete is a kind of manufacture method of high-temperature resistant and creep-resistant cast steel.
[background technology]
Creep resistance cast steel is a kind of special rolling-mill section that is widely used in the world at present on overcritical and the supercritical turbine, GX-12CrMoWVNbN1011 creep resistance cast steel material has been succeeded in developing in Europe, and this material has 100000 hours creep strength under 100Mpa and 600 ℃ of conditions.Because this materials chemistry composition complexity, its specification limit is very narrow again, and technical requirements is very high, and the production difficulty is very big, therefore, and the domestic all dependence imports when using this type of material of China.
Domestic enterprise also attempts carrying out the production of this type of material, wherein all needs to carry out vacuum metling through the LF stove when producing molten steel, or carries out AOD argon oxygen and mix and blow smelting, passes through the VD vacuum-treat again; Consequently, in investment many (generally needing more than 5,000,000 yuan) on the vacuum metling equipment, the production site that takies is big, the long flow path of production, and complicated operating process, the energy consumption height, the foundry goods of production is scrapped because of defectives such as pore, crackles.
[summary of the invention]
The object of the present invention is to provide under a kind of situation that does not also have vacuum metling equipment in enterprise, utilize the manufacture method of existing working condition stably manufactured high-temperature resistant and creep-resistant cast steel, to smelt the molten steel that to meet European technical standards, produce overcritical and the used steel casting of supercritical turbine.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of manufacture method of high-temperature resistant and creep-resistant cast steel adopts basic electric arc furnace to smelt, and the ladle heat insulation stove adopts the mode of Argon to carry out refining, argon for protecting pouring, and the steel casting of production high-temperature resistant and creep-resistant, its concrete steps are:
(1) adopt basic electric arc furnace to smelt
1. selected furnace charge: furnace charge need be answered inclusion-free, no iron rust and low-sulfur phosphorus through selected, and iron alloy uses after toasting;
2. melting period dephosphorization: furnace bottom shop lime 1.5～2.5%, oxygen blast is fluxed when forming the molten bath in stove, and oxygen blast pressure is at 0.4～0.6MPa, oxygen-consumption 8～10m
3/ t, slag making in advance, stream slag operation;
3. decarburization oxidation period: oxidizing temperature 〉=1580 ℃, oxygen blast pressure 0.8～1.2MPa, decarburized amount 〉=0.30%;
4. reducing slag hold-time 〉=30 minute, slag transfers white slag to, ferric oxide (FeO)≤0.50%;
5. strengthen deoxidation surplus energy, the remaining aluminium in the maintenance molten steel is 0.01%～0.02%;
(2) the laggard ladle heat insulation stove of electrosmelting carries out ar blowing refining
1. the temperature of ar blowing refining: 1600 ± 10 ℃;
2. the pressure of Argon: 0.10～0.30MPa;
3. time of Argon: 45～60 minutes;
4. argon gas contains Ar 〉=99.99%;
5. adjust the molten steel chemical ingredients;
(3) teeming temperature of creep resistance steel casting and pouring speed
Through the refining of ladle heat insulation stove, after chemical ingredients is all qualified, begin cast;
1. teeming temperature: 1560 ℃～1580 ℃;
2. pouring speed: 25～120kg/s.
The positively effect of the manufacture method of high-temperature resistant and creep-resistant cast steel of the present invention is:
(1) realized under the situation that does not have vacuum metling equipment, utilized existing working condition to produce high-temperature resistant and creep-resistant cast steel;
(2) optimized classical process for making: use the auxilliary ladle heat insulation stove ar blowing refining of existing common basic electric arc furnace, through furnace charge pre-treatment, strong dephosphorization under oxidizing atmosphere, reduce the production of deoxidation control reducing slag, ladle argon-blown, realization creep resistance steel casting deeply;
(3) do not need vacuum metling equipment, reduced facility investment, do not take production site more, operating process is simple relatively, and energy consumption is less, can produce the novel anti creep steel casting of conform European standard;
(4) realized the production domesticization production of gigawatt supercritical turbine and large-scale gas turbine creep resistance steel casting, reduced production cost, for enterprise has saved a large amount of foreign exchanges.
[embodiment]
Below specify the manufacture method of high-temperature resistant and creep-resistant cast steel of the present invention.
A kind of manufacture method of creep resistance steel casting adopts basic electric arc furnace to smelt, and the ladle heat insulation stove adopts the mode of Argon to carry out refining, produces creep resisting steel casting, and its concrete steps are:
(1) adopt basic electric arc furnace to smelt
1. furnace charge: furnace charge need be answered inclusion-free, no iron rust and low-sulfur phosphorus through selected, and iron alloy and lime will be through overbakings before using, and slag making materials will drying;
2. melting period dephosphorization; Furnace bottom shop lime 1.5～2.5%, oxygen blast is fluxed when forming the molten bath in stove, and oxygen blast pressure is at 0.4～0.6MPa, oxygen-consumption 8～10m
3/ t, slag making in advance, stream slag operation;
3. decarburization dephosphorization oxidation period: oxidizing temperature 〉=1580 ℃, oxygen blast pressure 0.8～1.2MPa, the molten bath boiling is fierce, flows slag automatically; And add slag charge, keep the slag dephosphorizing capacity; Decarbonization rate 〉=0.06%/min, decarburized amount 〉=0.30%;
4. carbide slag is directly made in reduction, adds calcium carbide 1.5～2.5kg/T.Good reducing slag hold-time 〉=30 minute, slag transfers white slag to, ferric oxide (FeO)≤0.50%;
5. strengthen deoxidation surplus energy, the remaining aluminium in the maintenance molten steel is 0.01%～0.02%;
(2) the laggard ladle heat insulation stove of electrosmelting carries out ar blowing refining
1. the temperature of ar blowing refining: 1600 ± 10 ℃;
2. the pressure of Argon: 0.10～0.30MPa;
3. time of Argon: 45～60 minutes;
4. argon gas contains Ar 〉=99.99%;
5. adjust the molten steel chemical ingredients;
(3) teeming temperature of creep resistance steel casting and pouring speed
After the refining of ladle heat insulation stove, chemical ingredients is all qualified, and temperature is poured into a mould by suitable the beginning.
1. teeming temperature: 1560 ℃～1580 ℃;
2. pouring speed: 25kg～120kg/s.
The creep resistance steel casting molten steel that utilizes method of the present invention to smelt and the contrast of Siemens and Japanese creep resistance steel casting molten steel technological standard see the following form:
Claims (1)
1. the manufacture method of a high-temperature resistant and creep-resistant cast steel adopts basic electric arc furnace to smelt, and the ladle heat insulation stove adopts the mode of Argon to carry out refining, argon for protecting pouring, and the steel casting of production high-temperature resistant and creep-resistant is characterized in that its concrete steps are:
(1) adopt basic electric arc furnace to smelt
1. selected furnace charge: furnace charge need be answered inclusion-free, no iron rust and low-sulfur phosphorus through selected, and iron alloy uses after toasting;
2. melting period dephosphorization: furnace bottom shop lime 1.5～2.5%, oxygen blast is fluxed when forming the molten bath in stove, and oxygen blast pressure is at 0.4～0.6MPa, oxygen-consumption 8～10m
3/ t, slag making in advance, stream slag operation;
3. decarburization oxidation period: oxidizing temperature 〉=1580 ℃, oxygen blast pressure 0.8～1.2MPa, decarburized amount 〉=0.30%;
4. reducing slag hold-time 〉=30 minute, slag transfers white slag to, ferric oxide≤0.50%;
5. strengthen deoxidation surplus energy, the remaining aluminium in the maintenance molten steel is 0.01%～0.02%;
(2) the laggard ladle heat insulation stove of electrosmelting carries out ar blowing refining
1. the temperature of ar blowing refining: 1600 ± 10 ℃;
2. the pressure of Argon: 0.10～0.30MPa;
3. time of Argon: 45～60 minutes;
4. argon gas contains Ar 〉=99.99%;
5. adjust the molten steel chemical ingredients;
(3) teeming temperature of creep resistance steel casting and pouring speed
Through the refining of ladle heat insulation stove, after chemical ingredients is all qualified, begin cast;
1. teeming temperature: 1560 ℃～1580 ℃;
2. pouring speed: 25～120kg/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102012816A CN101760580B (en) | 2009-12-17 | 2009-12-17 | Manufacturing method of high-temperature resistant and creep-resistant cast steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102012816A CN101760580B (en) | 2009-12-17 | 2009-12-17 | Manufacturing method of high-temperature resistant and creep-resistant cast steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101760580A CN101760580A (en) | 2010-06-30 |
| CN101760580B true CN101760580B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102012816A Expired - Fee Related CN101760580B (en) | 2009-12-17 | 2009-12-17 | Manufacturing method of high-temperature resistant and creep-resistant cast steel |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105039644A (en) * | 2015-07-30 | 2015-11-11 | 益阳金沙重型机械制造有限公司 | Production method for molten steel for steel castings |
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Granted publication date: 20110720 Termination date: 20211217 |