CN104313494B - The smelting process of steel SA-335P92 for a kind of super critical boiler - Google Patents
The smelting process of steel SA-335P92 for a kind of super critical boiler Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The smelting process that the invention discloses a kind of super critical boiler steel SA-335P92, the method comprises (1) electro-smelting, obtains carbon weight content≤0.03%, the molten steel of temperature >=1600 DEG C; (2) ladle refining, (2-1) deoxidation, (2-2) adjusting component; (2-3) molten steel adjusting component in LF stove that alloy solution step (2-2) being obtained adds step (2-1) to obtain; LF stove in step (2) adopts ultra high power graphite electrode; (3) vacuum outgas; (4) adjust nitrogen content; (5) cast. The present invention does not adopt the material of carbon containing as far as possible at ladle refining, avoid carbon to enter molten steel at refining process, reduce as much as possible carbon increasing amount in ladle refining process, thereby after ladle refining, do not need decarburization and refining again, reduce by two operations with respect to prior art.
Description
Technical field
The present invention relates to the smelting process of a kind of super critical boiler steel SA-335P92.
Background technology
The element that Ultra Supercritical Boiler Steel SA-335P92 comprises following percentage by weight: carbon 0.07-0.13%; Silicon≤0.50%; Manganese 0.30-0.60%; Phosphorus≤0.020%; Sulphur≤0.010%; Chromium 8.50-9.50%; Molybdenum 0.30-0.60%; Vanadium 0.15-0.25%; Niobium 0.04-0.09%; Nickel≤0.40%; Aluminium≤0.020%; Boron 0.001-0.006%; Tungsten 1.50-2.00%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen 0.030-0.070%; All the other are iron and inevitable impurity. At present, the traditional smelting of this steel gradeTechnique is made up of following process:
Step 1: electro-smelting, oxygen decarburization; Step 2: LF refining, adjusting component temperature; Step 3: VOD vacuum is blownOxygen decarburization; Step 4: LF refining again, adjusting component and temperature; Step 5: VD vacuum outgas; Step 6: adjust nitrogen content;Step 7: cast.
Because steel grade alloy content is high, carbon content is very low, therefore after refining, needs vacuum oxygen to contain to reduce carbonAmount, when carbon content reduces, alloy must have part scaling loss, needs back again LF refining adjusting component, twice LF essence after VODRefining can increase power consumption, alloy consumption greatly, affects efficiency and manufacturing schedule direct motion, causes smelting cost to increase substantially.
Summary of the invention
The technical problem to be solved in the present invention is: the simple super critical boiler of a kind of technique steel SA-335P92 is providedSmelting process.
In order to solve the problems of the technologies described above, super critical boiler of the present invention comprises following percentage by weight with steel SA-335P92Element: carbon 0.07-0.13%; Silicon≤0.50%; Manganese 0.30-0.60%; Phosphorus≤0.020%; Sulphur≤0.010%; Chromium 8.50-9.50%; Molybdenum 0.30-0.60%; Vanadium 0.15-0.25%; Niobium 0.04-0.09%; Nickel≤0.40%; Aluminium≤0.020%; Boron 0.001-0.006%; Tungsten 1.50-2.00%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen 0.030-0.070%; All the other are iron and inevitably assortedMatter, the smelting process of this boiler steel comprises the following steps:
(1) electro-smelting: in electric furnace, add the pig iron/molten iron, steel scrap and slag making materials melting, obtain carbon weight content≤0.03%, the molten steel of temperature >=1600 DEG C;
(2) ladle refining: (2-1) deoxidation: in LF stove, adopt carbon-free deoxidier to deoxygenation of liquid steel, (2-2) adjustComposition: the alloy for regulating Chemical Components of Liquid Steel is fused into alloy solution with the heating furnace of non-carbon containing; (2-3) by step (2-2)Molten steel adjusting component in LF stove that the alloy solution obtaining adds step (2-1) to obtain; LF stove in step (2) adopts superelevationPower graphite electrode;
(3) vacuum outgas;
(4) adjust nitrogen content;
(5) cast.
In order to improve vacuum outgas effect, described step (3) vacuum outgas: the molten steel after refining is outwelled and accounted for gross weightAfter the refining slag of 30-50%, enter vacuum receiver, before vacuum outgas, add silicon-calcium wire, be less than vacuum under 133Pa condition at pressureDegassed 20-30 minute, when vacuum outgas from furnace bottom to molten steel blowing argon gas or nitrogen.
In order further to improve vacuum outgas effect, described step (3) vacuum outgas, vacuum≤133Pa, argon gas orNitrogen flow is 3-5Nm3/h。
In order to be convenient to adjust nitrogen content in step (4), after described step (3) vacuum outgas, temperature is 1590-1640 DEG C, chromiumWeight content is 8.0-9.0%.
In order effectively to adjust nitrogen content, described step (4) is adjusted nitrogen content: after vacuum outgas by adding chromium nitrideAlloy is adjusted nitrogen content in molten steel, after adding, after soft blow in 10-30 minute reaches tapping temperature, taps.
Described step (5) cast: adjust to the right place and temperature cast during at 1540-1580 DEG C until all the components.
The described pig iron/molten iron adds weight to account for the more than 50% of total raw material.
The invention has the beneficial effects as follows: the present invention does not adopt the material of carbon containing as far as possible at ladle refining, avoid carbon in refiningProcess enters molten steel, reduces as much as possible carbon increasing amount in ladle refining process, thereby after ladle refining, does not need decarburization and againInferior refining, reduces by two operations with respect to prior art, and technique of the present invention is simple, reduced consumption, improved production efficiency, jointApproximately cost, be convenient to implement and promote.
Detailed description of the invention
Embodiment 1: the smelting process of steel SA-335P92 for a kind of super critical boiler, comprises the following steps:
(1) electro-smelting: add the pig iron/molten iron, steel scrap and slag making materials melting in electric furnace, the pig iron/weight of molten iron accounts forTotal raw-material 55%, controlling electric furnace steel tapping carbon weight content is 0.02%, and 1650 DEG C of electric furnace steel tapping temperature, adopt eccentric furnace bottom to go outThe mode of steel is obtained molten steel;
(2) ladle refining: (2-1) deoxidation: in LF stove, adopt silica flour to deoxygenation of liquid steel, (2-2) adjusting component: will useBe fused into alloy solution in the alloy that regulates Chemical Components of Liquid Steel with resistance wire heating furnace; (2-3) alloy step (2-2) being obtained is moltenMolten steel adjusting component in LF stove that liquid adds step (2-1) to obtain; LF stove in step (2) adopts ultra high power graphite electricityThe utmost point;
(3) vacuum outgas: enter vacuum receiver after the molten steel after refining being outwelled to 30% refining slag, before vacuum outgasIn molten steel, add silicon-calcium wire, at pressure 100Pa, argon flow amount 4.0Nm3Vacuum outgas 21 minutes under the condition of/h, argon gas fromTank bottom blowing enters, and after vacuum outgas, molten steel temperature is 1600 DEG C, and controlling weight of chromium content is 8.50%.
(4) adjust nitrogen content: after vacuum outgas by adding chromium nitride alloy to adjust nitrogen content in molten steel, after adding throughSoft blow in 15 minutes drops to 50 DEG C to superheat of liquid steel, adjusts weight nitroxide content to 0.050%.
(5) cast: be and produce the forging-grade ingot that boiler is used after cast cooling and demolding, steel ingot smelting component is (weightPercentage): carbon 0.10%; Silicon 0.30%; Manganese 0.45%; Phosphorus≤0.020%; Sulphur≤0.010%; Chromium 9.00%; Molybdenum 0.40%; Vanadium0.20%; Niobium 0.06%; Nickel≤0.40%; Aluminium≤0.020%; Boron 0.003%; Tungsten 1.70%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen0.050%; All the other are iron and inevitable impurity.
Embodiment 2: the smelting process of steel SA-335P92 for a kind of super critical boiler, comprises the following steps:
(1) electro-smelting: add the pig iron/molten iron, steel scrap and slag making materials melting in electric furnace, the pig iron/weight of molten iron accounts forTotal raw-material 58%, obtain carbon weight content and be 0.023%, temperature is the molten steel of 1660 DEG C;
(2) ladle refining: (2-1) deoxidation: in LF stove, adopt silicon calcium powder to deoxygenation of liquid steel, (2-2) adjusting component: willFor regulating the alloy resistance wire heating furnace of Chemical Components of Liquid Steel to be fused into alloy solution; (2-3) alloy step (2-2) being obtainedMolten steel adjusting component in LF stove that solution adds step (2-1) to obtain; LF stove in step (2) adopts ultra high power graphite electricityThe utmost point;
(3) vacuum outgas: enter vacuum receiver after the molten steel after refining being outwelled to 40% refining slag, before vacuum outgasIn molten steel, add silicon-calcium wire, at pressure 90Pa, argon flow amount 3.8Nm3Vacuum outgas 23 minutes under the condition of/h, argon gas is from tankBottom blowing enters, and after vacuum outgas, molten steel temperature is 1595 DEG C, and controlling weight of chromium content is 8.20%.
(4) adjust nitrogen content: after vacuum outgas by adding chromium nitride alloy to adjust nitrogen content in molten steel, after adding throughSoft blow in 17 minutes drops to 48 DEG C to superheat of liquid steel, adjusts weight nitroxide content to 0.045%.
(5) cast: be after cooling and demolding and produce the forging-grade ingot that boiler is used. Steel ingot smelting component is (weight percentThan): carbon 0.11%; Silicon 0.35%; Manganese 0.40%; Phosphorus≤0.012%; Sulphur≤0.010%; Chromium 8.70%; Molybdenum 0.35%; Vanadium 0.19%; Niobium0.07%; Nickel≤0.40%; Aluminium≤0.020%; Boron 0.004%; Tungsten 1.7%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen 0.045%; All the otherFor iron and inevitable impurity.
Embodiment 3: the smelting process of steel SA-335P92 for a kind of super critical boiler, comprises the following steps:
(1) electro-smelting: add the pig iron/molten iron, steel scrap and slag making materials melting in electric furnace, the pig iron/weight of molten iron accounts forTotal raw-material 53%, obtain carbon weight content and be 0.018%, temperature is the molten steel of 1635 DEG C.
(2) ladle refining: (2-1) deoxidation: in LF stove, adopt silica flour and silicon calcium powder to deoxygenation of liquid steel, (2-2) be adjusted toPoint: the alloy for regulating Chemical Components of Liquid Steel is fused into alloy solution with resistance wire heating furnace; Alloy is used resistance wire heating furnace alsoCan adopt other non-heating furnace containing charcoal, such as not being graphite electrode heating furnace, the alloy (2-3) step (2-2) being obtainedMolten steel adjusting component in LF stove that solution adds step (2-1) to obtain; LF stove in step (2) adopts ultra high power graphite electricityThe utmost point.
(3) vacuum outgas: enter vacuum receiver after the molten steel after refining being outwelled to 50% refining slag, before vacuum outgasIn molten steel, add silicon-calcium wire, at pressure 95Pa, nitrogen flow 3.5Nm3Vacuum outgas 26 minutes under the condition of/h, nitrogen is from tankBottom blowing enters, and after vacuum outgas, molten steel temperature is 1610 DEG C, and controlling weight of chromium content is 8.10%.
(4) adjust nitrogen content: after vacuum outgas by adding chromium nitride alloy to adjust nitrogen content in molten steel, after adding throughSoft blow in 25 minutes drops to 54 DEG C to superheat of liquid steel, adjusts weight nitroxide content to 0.055%.
(5) cast: be after cooling and demolding and produce the forging-grade ingot that boiler is used. Steel ingot smelting component is (weight percentThan): carbon 0.09%; Silicon≤0.50%; Manganese 0.50%; Phosphorus≤0.020%; Sulphur≤0.010%; Chromium 8.60%; Molybdenum 0.38%; Vanadium 0.20%;Niobium 0.06%; Nickel≤0.40%; Aluminium≤0.020%; Boron 0.004%; Tungsten 1.90%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen 0.06%; ItsYu Weitie and inevitably impurity.
In the various embodiments described above: can be ferrosilicon, ferromanganese, ferrochrome and ferrotungsten for regulating the alloy of composition in step (2)Deng alloy, this is to carry out according to the actual requirements to determine alloy, and it is the conventional skill of this area that how to confirm regulates the alloy of Chemical Components of Liquid SteelArt means. The pig iron/molten iron represents one or both in the pig iron and molten iron.
Claims (7)
1. a smelting process of steel SA-335P92 for super critical boiler, this super critical boiler comprises following with steel SA-335P92The element of percentage by weight: carbon 0.07-0.13%; Silicon≤0.50%; Manganese 0.30-0.60%; Phosphorus≤0.020%; Sulphur≤0.010%; Chromium8.50-9.50%; Molybdenum 0.30-0.60%; Vanadium 0.15-0.25%; Niobium 0.04-0.09%; Nickel≤0.40%; Aluminium≤0.020%; Boron0.001-0.006%; Tungsten 1.50-2.00%; Zirconium≤0.01%; Titanium≤0.01%; Nitrogen 0.030-0.070%; All the other are iron and can not keep awayThe impurity of exempting from, is characterized in that: the smelting process of this boiler steel comprises the following steps:
(1) electro-smelting: in electric furnace, add the pig iron/molten iron, steel scrap and slag making materials melting, obtain carbon weight content≤0.03%, the molten steel of temperature >=1600 DEG C;
(2) ladle refining: (2-1) deoxidation: in LF stove, adopt carbon-free deoxidier to deoxygenation of liquid steel, (2-2) be adjusted toPoint: the alloy for regulating Chemical Components of Liquid Steel is fused into alloy solution with the heating furnace of non-carbon containing; (2-3) step (2-2) is obtainedTo alloy solution molten steel adjusting component in LF stove of adding step (2-1) to obtain; LF stove in step (2) adopts superelevation meritRate graphite electrode;
(3) vacuum outgas;
(4) adjust nitrogen content;
(5) cast.
2. smelting process according to claim 1, is characterized in that: described step (3) vacuum outgas: by after refiningMolten steel enters vacuum receiver after outwelling the refining slag that accounts for gross weight 30-50%, adds silicon-calcium wire before vacuum outgas, is less than at pressureVacuum outgas 20-30 minute under 133Pa condition, when vacuum outgas from furnace bottom to molten steel blowing argon gas or nitrogen.
3. smelting process according to claim 2, is characterized in that: described step (3) vacuum outgas, and vacuum≤133Pa, argon gas or nitrogen flow are 3-5Nm3/h。
4. smelting process according to claim 3, is characterized in that: after described step (3) vacuum outgas, temperature is 1590-1640 DEG C, weight of chromium content is 8.0-9.0%.
5. smelting process according to claim 4, is characterized in that: described step (4) is adjusted nitrogen content: vacuum outgasBy adding chromium nitride alloy to adjust nitrogen content in molten steel, after adding, after reaching tapping temperature, soft blow in 10-30 minute goes out afterwardsSteel.
6. smelting process according to claim 5, is characterized in that: described step (5) cast: treat that all the components adjusts toPosition and temperature are poured into a mould in the time of 1540-1580 DEG C.
7. according to the smelting process described in any one in claim 1-6, it is characterized in that: the described pig iron/molten iron addsWeight accounts for the more than 50% of total raw material.
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| CN104651754B (en) * | 2015-02-05 | 2017-05-17 | 山东钢铁股份有限公司 | Low alloy steel for high-pressure boiler tube and preparation method thereof |
| CN109207845A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method |
| CN107604260A (en) * | 2017-09-19 | 2018-01-19 | 安徽恒利增材制造科技有限公司 | A kind of iron base alloy and preparation method thereof |
| CN107604229A (en) * | 2017-09-19 | 2018-01-19 | 安徽恒利增材制造科技有限公司 | A kind of high-strength iron-based alloy and its preparation method |
| CN115044823B (en) * | 2022-06-28 | 2023-05-30 | 江苏永钢集团有限公司 | Production process of ultra-supercritical high-pressure boiler steel P92 continuous casting large round billet |
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