CN107760810A - Production method of pipeline steel - Google Patents
Production method of pipeline steel Download PDFInfo
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- CN107760810A CN107760810A CN201710832618.8A CN201710832618A CN107760810A CN 107760810 A CN107760810 A CN 107760810A CN 201710832618 A CN201710832618 A CN 201710832618A CN 107760810 A CN107760810 A CN 107760810A
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- steel
- pipe line
- molten iron
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 129
- 239000010959 steel Substances 0.000 title claims abstract description 129
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000007670 refining Methods 0.000 claims abstract description 45
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 8
- 238000011282 treatment Methods 0.000 claims description 54
- 239000002893 slag Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 30
- 238000005261 decarburization Methods 0.000 claims description 27
- 238000012545 processing Methods 0.000 claims description 26
- 229910052717 sulfur Inorganic materials 0.000 claims description 16
- 238000006477 desulfuration reaction Methods 0.000 claims description 15
- 230000023556 desulfurization Effects 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 13
- 239000010436 fluorite Substances 0.000 claims description 13
- 239000011593 sulfur Substances 0.000 claims description 12
- 238000003763 carbonization Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- -1 ore Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 241000254158 Lampyridae Species 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 6
- 239000005864 Sulphur Substances 0.000 description 5
- 235000010210 aluminium Nutrition 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 206010021143 Hypoxia Diseases 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 208000018875 hypoxemia Diseases 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910018619 Si-Fe Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 229910008289 Si—Fe Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
the invention provides a production method of pipeline steel, which comprises the steps of pretreating molten iron, wherein the pretreatment at least comprises the steps of desulfurizing and dephosphorizing the molten iron to obtain semi-steel, blowing and decarbonizing the semi-steel to obtain decarbonized molten steel, tapping the decarbonized molten steel, carrying out L F-furnace slagging refining on the decarbonized molten steel after tapping, carrying out RH refining on the molten steel after L F-furnace slagging refining, and obtaining the pipeline steel through the molten steel after the RH refining.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of production method of pipe line steel.
Background technology
With the progress of society, requirement of the market to steel cleanliness factor and cost increasingly strengthens.High-cleanness, high, it is low into
Originally it is the major technique direction of century steel products Quality Developing, in order to improve the various performances of steel, extends service life, carry
High intensity, it is desirable to the impurity content and field trash total amount of steel are more low better, and in order to improve enterprise competitiveness, it is desirable to steel
Cost is more low better.Pipe line steel purposes is special, such as available for oil, natural gas transmission pipeline etc., because use condition is more next
Harsher, requirement to pipeline also more and more higher, existing pipe line steel is typically produced using single refinery practice, however, in pipe line steel
In actual production, often due to the presence of field trash so that the defects of flaw detection does not conform to often occurs for pipe line steel.
The content of the invention
For drawbacks described above, it is a primary object of the present invention to provide a kind of production method of pipe line steel, pipeline is improved
The cleanliness factor of product made from steel, reduces the defects of flaw detection does not conform to.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of production method of pipe line steel, methods described
Including：
Molten iron is pre-processed, the pretreatment comprises at least carries out desulfurization process and dephosphorization treatment to the molten iron,
Obtain half steel；
Blowing carbonization treatment is carried out to the half steel and obtains decarburization molten steel；
The decarburization molten steel is subjected to tapping processing；
The decarburization molten steel after the tapping is handled carries out the processing of LF stoves slag refining；
Molten steel after LF stoves slag refining processing is subjected to RH refining treatments；
The pipe line steel is obtained by the molten steel after the RH refining treatments.
Preferably the silicone content in molten iron before the pretreatment be 0.15%≤Si≤0.40% as further, warm
Spend for 1330 DEG C≤T≤1380 DEG C, sulfur content S≤0.080%.
As it is further preferably, it is described pretreatment is carried out to molten iron to specifically include：
Desulfurization process is carried out to the molten iron；
Into the molten iron after desulfurization process, addition steel scrap, the first auxiliary material carry out blowing dephosphorization treatment, obtain at dephosphorization
Half steel after reason.
As it is further preferably, it is described desulfurization process is carried out to molten iron to specifically include：The molten iron is once taken off
Slag treatment；Desulfurizing agent is added into the molten iron after taking off Slag treatment and carries out KR desulfurization, sulfur content is obtained and is less than or equal to
0.0005% molten iron；It is secondary to molten iron progress of the sulfur content of acquisition less than or equal to 0.0005% to take off Slag treatment, obtain
The molten iron for staying slag rate to be less than or equal to 2%.
As further preferred, mixture of the desulfurizing agent including lime and fluorite, the matter of the lime and fluorite
It is 10-15 to measure ratio:1.
As further preferably, first auxiliary material is selected from high calcium lime, light dolomite, ore, fluorite and ferrosilicon.
As further preferred, the blowing carbonization treatment, including：Molten steel after the dephosphorization treatment is placed in decarburization
In converter, add the second auxiliary material and carry out blowing carbonization treatment；The converter terminal temperature control that process is bessemerized in the decarburization is
1650 DEG C~1680 DEG C, the C content of blowing end point is 0.04-0.07%, and P content is less than or equal to 0.010%, S contents and is less than etc.
In 0.0050%.
As further preferably, second auxiliary material includes lime and fluorite, and the lime adding amount is 5-7kg/ tons
Steel, fluorite addition are 1-3kg/ ton steel.
As further preferably, the LF stoves slag refining processing includes：150-200kg aluminium is added in the LF stoves
Slag, the heating of 1.5~2t synthetic slags submerged arc.
As further preferably, the RH refining treatments include：The RH refinings use vacuum tank, the vacuum tank
Vacuum≤200Pa time is >=15min；Circulating pipe >=12 piece in the vacuum tank.
As further preferred, the molten steel acquisition pipe line steel by after RH refining treatments, including：By RH
Molten steel after refining treatment carries out conticaster cast.
The beneficial effects of the invention are as follows：The present invention carries out desulfurization process, dephosphorization treatment and carbonization treatment to molten iron and obtained
Decarburization molten steel；The decarburization molten steel is subjected to tapping processing；The decarburization molten steel after the tapping is handled carries out LF stoves and made
Slag refining treatment；Molten steel after LF stoves slag refining processing is subjected to RH refining treatments；By through the RH refining treatments
Molten steel afterwards obtains the pipe line steel.The present invention is i.e. using full dose molten iron " three is de- " pretreating process, and by LF stoves slag making essence
Refining processing, RH refining treatments etc. operate and control the parameter of each operating procedure, you can production low-sulfur hypoxemia molten steel, are not only produced into
This low and product cleanliness factor is high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the production method schematic flow sheet of pipe line steel provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained, belong to what the present invention protected
Scope.
A kind of production method of pipe line steel provided in an embodiment of the present invention, it can be applied to produce J55 pipe line steels.Wherein, J55
Belong to petroleum casing pipe class pipe line steel, be the important materials in oil, gas exploitation course, be applied to the drilling life in oil field
Production.State, inside and outside be in charge of factory body will be carried out after J55 coiled sheet tubulations heat treatment upgrade to N80/P110/HCP110 ranks production
Product.Different from traditional pipe line steel, heat treatment upgrading is high to the purity requirements of steel with J55 pipe line steels, and J55 pipe line steels will
Seek the coefficient of expansion of field trash and steel matrix difference is smaller is advisable.Full dose molten iron " three is de- " pretreatment that the embodiment of the present invention uses
Technique, and operated by the processing of LF stoves slag refining, RH refining treatments etc. and control the parameter of each operating procedure, you can production is low
Sulphur hypoxemia molten steel, not only production cost is low and product cleanliness factor is high.；Realizing makes while Molten Steel Cleanliness is improved in steel
Residual composition of inclusions meets the requirement of J55 or other pipe line steels in tubulation, heat treatment process.
Specifically, referring to Fig. 1, a kind of production method of pipe line steel provided in an embodiment of the present invention, including following step
Suddenly：
Step 100：Molten iron is pre-processed, the pretreatment, which comprises at least, to be carried out desulfurization process to the molten iron and take off
Phosphorus processing, obtains half steel；
Step 200：Blowing carbonization treatment is carried out to the half steel and obtains decarburization molten steel；
Step 300：The decarburization molten steel is subjected to tapping processing；
Step 400：The decarburization molten steel after the tapping is handled carries out the processing of LF stoves slag refining；
Step 500：Molten steel after LF stoves slag refining processing is subjected to RH refining treatments；
Step 600：The pipe line steel is obtained by the molten steel after the RH refining treatments.
Hereinafter, each step is illustrated respectively especially exemplified by several embodiments.
In step 100, molten iron is pre-processed, specifically includes following sub-step：
Step 101：Molten iron in ladle is carried out to taking off Slag treatment successively, adds desulfurizing agent KR desulfurizing irons processing, again
It is secondary to take off Slag treatment, molten iron is then blended into dephosphorization converter；
Step 102：Steel scrap is added into the dephosphorization converter, the first auxiliary material carries out blowing dephosphorization treatment；Then by gained
Molten steel is blended into decarburization converter；
Wherein, the molten iron requirement described in step 101：0.15%≤Si≤0.40%, 1330 DEG C≤T≤1380 DEG C, S≤
0.080%；Desulfurizing agent is the mixture of lime and fluorite, and the mass ratio of the lime and fluorite is 10:1, after the desulfurization
Sulphur in molten iron contains S≤0.0005%, rate >=98% of skimming for taking off Slag treatment again.
Illustrated by above-mentioned steps exemplified by producing 2 embodiments of J55 pipe line steels respectively, table 1 is Examples 1 and 2
In by during the KR desulfurization process of above-mentioned steps molten steel sulfur content change and rate of skimming.
Table 1
Wherein, special dephosphorization stove converting process described in step 102 only allows using high calcium lime, light-burned, ore, fluorite
(per the not super 800kg of stove) and temperature raising ferrosilicon, the capacity per stove are 300t, and temperature raising ferrosilicon is used for supplementing converter heat, passes through silicon
Oxidation heating；For dephosphorization stove without using pressure agent, dephosphorization converter smelts that this is poured time and previous stove splashes slag and forbids to use coke.
Table 2 is dephosphorization stove terminal point control situation in the Examples 1 and 2 by above-mentioned steps production.Given up using self-loopa in factory
Steel 25t, wherein medium-sized steel scrap (processing) 12t, system material steel scrap (processing) 13t, are not added with small dreg piece steel.Converting process is not added with dedusting
The high-sulfur auxiliary material such as ash, pressure agent, the control of half steel sulphur is preferable, equal ＜ 0.0030%.
Table 2
| Embodiment | Temperature DEG C | C% | P% | S% |
| Embodiment 1 | 1312 | 3.30 | 0.024 | 0.0029 |
| Embodiment 2 | 1323 | 3.27 | 0.028 | 0.0028 |
Step 200：Blowing carbonization treatment is carried out to the molten steel and obtains decarburization molten steel；
Blowing carbonization treatment is carried out to molten steel the second auxiliary material of addition of the decarburization converter obtain decarburization molten steel.Wherein,
The decarburization bessemerizes process converter terminal temperature control at 1650 DEG C~1670 DEG C, and start heat improves 10 on this basis
℃；Target endpoint C：0.04-0.07%, terminal P content are controlled below 0.010%, and S contents are controlled below 0.0050%,
Smelt that this is poured time and preceding 1 stove splashes slag and forbids to use coke.
In addition, process lime adding amount 6kg/ ton steel, fluorite addition 1.5kg/ ton steel are bessemerized in the decarburization.
Table 3 is decarbonizing furnace terminal point control situation in the Examples 1 and 2 by above-mentioned steps production.Converting process is not added with efficiently
The high-sulfur auxiliary material such as concurrent heating agent, terminal P controls are preferable.
Table 3
| Embodiment | Outlet temperature | Terminal C% | Terminal oxygen | Terminal P | Temperature after stove | Whether after-blow |
| Embodiment 1 | 1655 | 0.041 | 516 | 0.0047 | 1577 | It is no |
| Embodiment 2 | 1654 | 0.092 | 306 | 0.0051 | 1582 | It is no |
Step 300：The decarburization molten steel is subjected to tapping processing；Then molten steel is poured into ladle；
Wherein, tapping 3min~4min sequentially adds the alloys such as whole steel shot aluminums, Si-Fe, and steel shot aluminum addition is compared with mould
Type increases 50-100kg；Tapping process carries out counter-current operation, it is ensured that various alloys, slag charge all melt；Tapping terminates to add
150kg aluminium slag balls carry out slag modification；Pushing off the slag before and after pushing off the slag uses.
Tap time 7-8min, and granule lime and alloy melting are preferable, enter the station composition in claimed range, Composition Control
It is more satisfactory.
Step 400：The decarburization molten steel after the tapping is handled carries out the processing of LF stoves slag refining；
Wherein, LF refining enters the station pre-blowing 3min, thermometric, and sampling refers to as the coarse adjustment of RH compositions；Add 150kg aluminium slags, 1.5
~2t synthetic slags submerged arc heats up.
Step 500：Molten steel after LF stoves slag refining processing is subjected to RH refining treatments；
Wherein, smelting cold steel, washing trough must be carried out before the RH refining vacuum channels production of use, it is ensured that vacuum tank is clean, circulation
Pipe >=12；Using present treatment control model, it is desirable to vacuum≤200Pa time >=15min；Forbid heating up, if temperature is high
It need to be adjusted, then be added before application of vacuum in 10min by steel scrap；RH processes carry out wire feeder test run, it is ensured that wire feeder cabling
And move back line operation normally, it disclosure satisfy that production requirement；Feed silk braid pipe and use new casing, ensure that silk thread operation is smooth, it is ensured that feed silk
Effect；Silk thread is checked, new handling new line must be used before production, and old line hangs LF stoves and consumed；RH class monitor and group leader on duty
Establishment officer carries out inspection of leaking hunting to bottom blowing system, ensures that bottom blowing pipeline without gas leakage, ensures soft blow effect；Strict implement pipe line steel
Smelt control to require, Calcium treatment operation is carried out according to S contents are terminated；Calcium treatment terminates soft blow 5min and takes total oxygen sample to analyze N, O.
Table 4 is LF, RH production process periodic Control situation in the Examples 1 and 2 by above-mentioned steps production.
Table 5 is Composition Control situation in LF, RH production process.Table 6 is RH process control situations.
Table 4
| Embodiment | LF stoves are in the station cycle | RH is in the station cycle | LF stove inlet temperatures | The LF stove heating-up times | Go out Bi Zhikai to pour |
| Embodiment 1 | 52 | 54 | 1563 | 23 | 155 |
| Embodiment 2 | 52 | 53 | 1562 | 20 | 154 |
Table 5
Table 6
| Embodiment | Vacuum time | Minimum vacuum degree | Feed calcium line amount | Terminate Ca |
| Embodiment 1 | 28 | 65 | 400 | 25ppm |
| Embodiment 2 | 28 | 73 | 300 | 11ppm |
Step 600：The pipe line steel is obtained by the molten steel after above-mentioned RH refining treatments.
Wherein, specifically include：Molten steel after RH refining treatments is subjected to conticaster cast.
Permanent pulling rate is ensured in step 600 in molten steel production process, need to such as become pulling rate, only allows change ± 0.1m/min, and
And forbid to rise back by pulling rate former pulling rate, speed change base freezes；This steel grade forbids middle Baogang's water tonnage to be less than 40 tons in process of production,
Such as reasons such as rhythm of production, middle Baogang's water is less than 40 tons, then stops to pour immediately；Before production, casting machine must carry out crystallizer and lean on arc,
4 days effectively；Argon gas 2L/min between filling pipe end argon gas 1L/min, plate；Three road argon gas are checked before roasting bag is wrapped in casting machine；Molten steel overheat
Control is at 15-30 DEG C.
Examples 1 and 2 overall process perseverance pulling rate 1.1m/min is produced；The middle bag degree of superheat is respectively 26 DEG C and 30 DEG C；Even
Nitrogen pick-up is cast all less than 3ppm (2ppm and -1.9ppm)；Middle bag oxygen is respectively 6ppm and 9ppm, calcium content be respectively 17ppm and
14ppm, sulfur content are respectively that 17ppm and 14ppm other chemical compositions meet control and required.Table 7 is bundled into a point situation in being.
Table 7
| Embodiment | O | N | S | Ca |
| Embodiment 1 | 6ppm | 20ppm | 17ppm | 17ppm |
| Embodiment 2 | 7ppm | 20ppm | 14ppm | 14ppm |
Oxygen, nitrogen, the content of sulphur can be seen that the oxygen, nitrogen, sulphur of the strand that 2 embodiments obtain in the strand provided from table 7
Content it is all very low.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage：
The present invention carries out desulfurization process, dephosphorization treatment and carbonization treatment to molten iron and obtains decarburization molten steel；By the decarburization
Molten steel carries out tapping processing；The decarburization molten steel after the tapping is handled carries out the processing of LF stoves slag refining；By the LF
Molten steel after the processing of stove slag refining carries out RH refining treatments；The pipeline is obtained by the molten steel after the RH refining treatments
Steel.The present invention is i.e. using full dose molten iron " three is de- " pretreating process, and by the behaviour such as the processing of LF stoves slag refining, RH refining treatments
Make and control the parameter of each operating procedure, you can production low-sulfur hypoxemia molten steel, not only production cost is low and product cleanliness factor is high.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various changes and modification without departing from the spirit and scope of the present invention.So, if these modifications and variations of the present invention
Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to exist comprising these changes and modification
It is interior.
Claims (10)
- A kind of 1. production method of pipe line steel, it is characterised in that：Methods described includes：Molten iron is pre-processed, the pretreatment comprises at least carries out desulfurization process and dephosphorization treatment to the molten iron, obtains Half steel；Blowing carbonization treatment is carried out to the half steel and obtains decarburization molten steel；The decarburization molten steel is subjected to tapping processing；The decarburization molten steel after the tapping is handled carries out the processing of LF stoves slag refining；Molten steel after LF stoves slag refining processing is subjected to RH refining treatments；The pipe line steel is obtained by the molten steel after the RH refining treatments.
- 2. the production method of pipe line steel according to claim 1, it is characterised in that：The silicon in molten iron before the pretreatment Content is 0.15%≤Si≤0.40%, and temperature is 1330 DEG C≤T≤1380 DEG C, sulfur content S≤0.080%.
- 3. the production method of pipe line steel according to claim 1, it is characterised in that：It is described that molten iron pre-process specifically Including：Desulfurization process is carried out to the molten iron；Into the molten iron after desulfurization process, addition steel scrap, the first auxiliary material carry out blowing dephosphorization treatment, after obtaining dephosphorization treatment Half steel.
- 4. the production method of the pipe line steel according to claim 1 or 3, it is characterised in that：It is described that molten iron is carried out at desulfurization Reason specifically includes：Slag treatment is once taken off to the molten iron；Desulfurizing agent is added into the molten iron after taking off Slag treatment to carry out KR desulfurization, obtain the molten iron that sulfur content is less than or equal to 0.0005%；0.0005% is less than or equal to the sulfur content of acquisition Molten iron progress is secondary to take off Slag treatment, obtains the molten iron for staying slag rate to be less than or equal to 2%.
- 5. the production method of pipe line steel according to claim 4, it is characterised in that：The desulfurizing agent includes lime and fluorite Mixture, the mass ratio of the lime and fluorite is 10-15:1.
- 6. the production method of pipe line steel according to claim 3, it is characterised in that：It is white that first auxiliary material is selected from high calcium Ash, light dolomite, ore, fluorite and ferrosilicon.
- 7. the production method of pipe line steel according to claim 3, it is characterised in that：The blowing carbonization treatment, including：Will Molten steel after the dephosphorization treatment is placed in decarburization converter, is added the second auxiliary material and is carried out blowing carbonization treatment；The decarburization converter The converter terminal temperature control of converting process is 1650 DEG C~1680 DEG C, and the C content of blowing end point is 0.04-0.07%, P content It is less than or equal to 0.0050% less than or equal to 0.010%, S contents.
- 8. the production method of pipe line steel according to claim 3, it is characterised in that：Second auxiliary material includes lime and firefly Stone, the lime adding amount are 5-7kg/ ton steel, and the fluorite addition is 1-3kg/ ton steel.
- 9. the production method of pipe line steel according to claim 1, it is characterised in that：The LF stoves slag refining processing bag Include：150-200kg aluminium slags, the heating of 1.5~2t synthetic slags submerged arc are added in the LF stoves.
- 10. the production method of pipe line steel according to claim 1, it is characterised in that：The RH refining treatments include：It is described RH refinings use vacuum tank, and vacuum≤200Pa of vacuum tank time is >=15min；Circulating pipe in the vacuum tank >=12.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108559816A (en) * | 2018-05-07 | 2018-09-21 | 承德建龙特殊钢有限公司 | A method of producing sulfur resistive pipe line steel using vanadium extraction by converter blowing half steel |
| CN109280732A (en) * | 2018-11-08 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of high cleanliness acid-resistant pipeline steel smelting process |
| CN114381576A (en) * | 2021-12-06 | 2022-04-22 | 首钢京唐钢铁联合有限责任公司 | LF (ladle furnace) slag and recycling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
| CN103667875A (en) * | 2013-08-15 | 2014-03-26 | 首钢京唐钢铁联合有限责任公司 | Preparation method of low-carbon acid-resistant pipeline steel |
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2017
- 2017-09-15 CN CN201710832618.8A patent/CN107760810A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
| CN103667875A (en) * | 2013-08-15 | 2014-03-26 | 首钢京唐钢铁联合有限责任公司 | Preparation method of low-carbon acid-resistant pipeline steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108559816A (en) * | 2018-05-07 | 2018-09-21 | 承德建龙特殊钢有限公司 | A method of producing sulfur resistive pipe line steel using vanadium extraction by converter blowing half steel |
| CN109280732A (en) * | 2018-11-08 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of high cleanliness acid-resistant pipeline steel smelting process |
| CN114381576A (en) * | 2021-12-06 | 2022-04-22 | 首钢京唐钢铁联合有限责任公司 | LF (ladle furnace) slag and recycling method thereof |
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