CN104894460A - Ni content control method of 9Ni steel - Google Patents
Ni content control method of 9Ni steel Download PDFInfo
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- CN104894460A CN104894460A CN201410079124.3A CN201410079124A CN104894460A CN 104894460 A CN104894460 A CN 104894460A CN 201410079124 A CN201410079124 A CN 201410079124A CN 104894460 A CN104894460 A CN 104894460A
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- China
- Prior art keywords
- steel
- converter
- nickel plate
- content
- decarburization
- Prior art date
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- Pending
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 94
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 35
- 238000005261 decarburization Methods 0.000 claims abstract description 14
- 238000010079 rubber tapping Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000011574 phosphorus Substances 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000007670 refining Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 12
- 235000011941 Tilia x europaea Nutrition 0.000 description 12
- 229910000514 dolomite Inorganic materials 0.000 description 12
- 239000010459 dolomite Substances 0.000 description 12
- 239000004571 lime Substances 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000012208 gear oil Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for controlling Ni content of 9Ni steel, wherein the loading amount control precision is target loading amount +/-1 t; adopting a duplex process, namely two converters for production, one for dephosphorization and the other for decarburization; the end point carbon of the semisteel is controlled at 2.3-2.5wt%, phosphorus is controlled at 0.012-0.025wt%, and the temperature is controlled at 1370-1420 ℃. And then adding the semi-steel into a decarburization converter for decarburization and temperature rise, adding iron, adding a nickel plate into the decarburization converter, wherein the adding amount of the nickel plate is =9 x, and the later half-steel charging amount is x (1-8%)/91 x 97%. The slag amount of the first half steel is controlled to be 40-45kg/t steel, and the slag amount of the second half steel is controlled to be 45-50kg/t steel; after tapping, adding nickel plates after the converter according to the adding amount of 0.35-0.78kg/t steel, and controlling the Ni content to be the target Ni content required by the converter. The invention can simplify the 9Ni steel production process, shorten the refining treatment time, reduce the temperature rise, reduce the consumption of the nickel plate, save 3.8-7.7kg of the nickel plate per ton of steel, effectively improve the control precision of the Ni content and improve the performance of the steel plate.
Description
Technical field
The invention belongs to process for making technical field, particularly a kind of Ni content control method of converter producing 9Ni steel.
Background technology
Along with the variation of global energy resource, following domestic to LNG(natural gas liquids) demand of terminal structure material will be very large, and the material of exploitation corresponding construction will become one of important step of energy strategy adjustment.
The temperature of LNG is-162 DEG C, requires that its structured material has some strength and toughness under extremely low temperature.Because 9Ni steel has low cost and excellent mechanical property, therefore the structured material of LNG storage and transportation equipment generally uses 9Ni steel in the world.Wherein, 9Ni steel is the ferrite Cryogenic Steel that uniquely can use at-196 DEG C.Ni is stabilizing element, alleviates fragility and improves mechanical property, strengthens acid-fast ability.
The area requirement of 9Ni steel chemical composition standard is comparatively strict, and Ni massfraction is 8.50-9.50%; In order to ensure that 9Ni plate property is stablized, usually Ni content is controlled at 8.9-9.1%.In order to improve Ni content control accuracy, way in the past takes converter initial adjustment, the mode of refining fine setting.Because the Ni content of 9Ni steel is high, after nickel plate is added in refining, easily cause molten steel composition uneven, long Argon is needed to stir, therefore extend the refining treatment time, and once molten steel composition mixing is bad, just Ni composition fluctuation range will be caused large, not only increase steel-making cost, also can affect the performance of steel plate simultaneously.
Summary of the invention
The present invention aims to provide one can simplify production technique, shortens the refining treatment time, improves Ni content control accuracy, reduces the consumption of nickel plate, reduce the Ni content control method of the 9Ni steel of steel-making cost.
For this reason, the solution that the present invention takes is:
A Ni content control method for 9Ni steel, is characterized in that, concrete grammar is:
1, duplex production technique is adopted:
Duplex technique i.e. two block converters are adopted to produce 9Ni steel, a block converter dephosphorization, another block converter decarburization; The molten steel that dephosphorization converter is smelted is front half steel, and the molten steel of decarburization converter smelting is rear half steel, and by the carbon content control of front half steel at 2.3-2.5wt%, terminal temperature controls at 1370-1420 DEG C, and phosphorus content controls at 0.012-0.025wt%; Then the smelting that rear half steel is carried out in decarburization converter is blended into after dephosphorization converter being smelted the tapping of front half steel.
2, converter Intake Quantity is stablized:
Control the Intake Quantity precision of the front half steel of converter and rear half steel, Intake Quantity control accuracy is: target Intake Quantity ± 1 ton.
3, control converter slag-making amount, stablize converter blow loss.
First half slag amount controls at 40-45kg/t steel, and later half slag amount controls at 45-50kg/t steel, and the blow loss of front half steel controls 5%, and the blow loss of rear half steel controls 8%.
4, nickel plate add-on is calculated:
Nickel plate add-on calculation formula is:
Nickel plate add-on=9 × rear half steel Intake Quantity × (1-8%)/(91 × 97%) ton.
5, the feed postition of nickel plate:
Nickel plate adds in decarburization converter, requires first according to target Intake Quantity hot metal charging, then by scrap box, nickel plate is added decarburization converter.
6, fine setting after tapping:
After converter tapping, according to converter terminal nickel content, according to increase by 0.01% nickel content, ton steel needs to add 0.1kg nickel plate and calculates, by Ni Composition Control at converter target call Ni content.
Beneficial effect of the present invention is:
1,9Ni steel production technique can be simplified, shorten the refining treatment time, reduce and heat up, save energy;
2, can reduce the consumption of nickel plate, nickel plate 3.8-7.7kg saved by steel per ton, reduces steel-making cost;
3, effectively can improve Ni content control accuracy, be conducive to improving plate property.
Embodiment
Embodiment 1:
260 tons of converters adopt double-united gear oil pump 9Ni steel.
1, the Intake Quantity of first half steel water+steel scrap controls at 285t, first hot metal charging, after add steel scrap.
2, front semisteel smelting adds lime 10t, light dolomite 3t, wherein, adds lime 3t within Converter Oxigen Blowing 2min, light dolomite 1.5t, adds ore 6t according to molten iron temperature; Remaining lime and light dolomite are often criticized add-on and are not more than 1t, and add within oxygen blast 5min.Half steel end point carbon controls at 2.3wt%, and phosphorus controls at 0.016wt%, and terminal temperature controls at 1380 DEG C.
3, rear half steel half steel+nickel plate add-on controls at 268t, first converts half steel water, after add 25.5t nickel plate, glue furnace lining to prevent nickel plate.
4, rear semisteel smelting adds lime 12t, light dolomite 3t, wherein, adds lime 6t within Converter Oxigen Blowing 2min, light dolomite 1.5t, adds ore 0.6t according to half steel temperature; Remaining lime and light dolomite are often criticized add-on and are not more than 1t, and add within oxygen blast 5min.
5, terminal temperature controls at 1590 DEG C, and terminal oxygen controls at 650ppm, avoids a little blowing over oxidation.
6, according to terminal Ni component content, after tapping, add 200kg nickel plate, guarantee Ni content control accuracy.
Embodiment 2:
260 tons of converters adopt double-united gear oil pump 9Ni steel.
1, the Intake Quantity of first half steel water+steel scrap controls at 284t, first hot metal charging, after add steel scrap.
2, front semisteel smelting adds lime 11t, light dolomite 3t, wherein within Converter Oxigen Blowing 2min, adds lime 3.3t, and light dolomite 1.5t adds ore 9t according to molten iron temperature; Remaining lime and light dolomite are often criticized add-on and are not more than 1t, and add within oxygen blast 5min.Half steel end point carbon controls at 2.5wt%, and phosphorus controls at 0.022wt%, and terminal temperature controls at 1410 DEG C.
3, rear half steel half steel+nickel plate add-on controls at 269t, first converts half steel water, after add 26t nickel plate, glue furnace lining to prevent nickel plate.
4, rear semisteel smelting adds lime 11t, light dolomite 3t, wherein within Converter Oxigen Blowing 2min, adds lime 5.5t, and light dolomite 1.5t adds ore 1t according to half steel temperature; Remaining lime and light dolomite are often criticized add-on and are not more than 1t, and add within oxygen blast 5min.
5, terminal temperature controls at 1610 DEG C, and terminal oxygen controls at 800ppm, avoids a little blowing over oxidation.
6, according to terminal Ni component content, after tapping, add 100kg nickel plate, guarantee Ni content control accuracy.
Claims (1)
1. a Ni content control method for 9Ni steel, is characterized in that, concrete grammar is:
(1), duplex production technique is adopted:
Duplex technique i.e. two block converters are adopted to produce 9Ni steel, a block converter dephosphorization, another block converter decarburization; The molten steel that dephosphorization converter is smelted is front half steel, and the molten steel of decarburization converter smelting is rear half steel, and by the carbon content control of front half steel at 2.3-2.5wt%, terminal temperature controls at 1370-1420 DEG C, and phosphorus content controls at 0.012-0.025wt%; Then the smelting that rear half steel is carried out in decarburization converter is blended into after dephosphorization converter being smelted the tapping of front half steel;
(2) converter Intake Quantity, is stablized:
Control the Intake Quantity precision of the front half steel of converter and rear half steel, Intake Quantity control accuracy is: target Intake Quantity ± 1 ton;
(3), control converter slag-making amount, stablize converter blow loss:
First half slag amount controls at 40-45kg/t steel, and later half slag amount controls at 45-50kg/t steel, and the blow loss of front half steel controls 5%, and the blow loss of rear half steel controls 8%;
(4) nickel plate add-on, is calculated:
Nickel plate add-on calculation formula is:
Nickel plate add-on=9 × rear half steel Intake Quantity × (1-8%)/(91 × 97%) ton;
(5), the feed postition of nickel plate:
Nickel plate adds in decarburization converter, requires first according to target Intake Quantity hot metal charging, then by scrap box, nickel plate is added decarburization converter;
(6), fine setting after tapping:
After converter tapping, according to converter terminal nickel content, according to increase by 0.01% nickel content, ton steel needs to add 0.1kg nickel plate and calculates, by Ni Composition Control at converter target call Ni content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079124.3A CN104894460A (en) | 2014-03-05 | 2014-03-05 | Ni content control method of 9Ni steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079124.3A CN104894460A (en) | 2014-03-05 | 2014-03-05 | Ni content control method of 9Ni steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104894460A true CN104894460A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410079124.3A Pending CN104894460A (en) | 2014-03-05 | 2014-03-05 | Ni content control method of 9Ni steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108715913A (en) * | 2018-06-07 | 2018-10-30 | 舞阳钢铁有限责任公司 | A kind of method of electric furnace smelting 9Ni steel |
-
2014
- 2014-03-05 CN CN201410079124.3A patent/CN104894460A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108715913A (en) * | 2018-06-07 | 2018-10-30 | 舞阳钢铁有限责任公司 | A kind of method of electric furnace smelting 9Ni steel |
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Application publication date: 20150909 |
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