CN105908080B - A kind of ocean platform potassium steel and its continuous casting steel billet preparation method - Google Patents
A kind of ocean platform potassium steel and its continuous casting steel billet preparation method Download PDFInfo
- Publication number
- CN105908080B CN105908080B CN201610497312.7A CN201610497312A CN105908080B CN 105908080 B CN105908080 B CN 105908080B CN 201610497312 A CN201610497312 A CN 201610497312A CN 105908080 B CN105908080 B CN 105908080B
- Authority
- CN
- China
- Prior art keywords
- steel
- slag
- continuous casting
- ladle
- potassium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A kind of preparation method of ocean platform potassium steel and its continuous casting steel billet, potassium steel composition contains C, Si, Mn, P, S, Al, C, Ni, Mo, Cr, N and Fe；Method：1) blast-melted pretreatment；2) converter smelting：Steel scrap is added to converter, is then poured into blast-melted in converter, point 2 addition slag formers；Then manganese, aluminum-manganese-iron alloy are added；Add after coverture and tap；3) LF refining：Argon simultaneously, adds W metal, Mo and Cu, is eventually adding the fine setting that aluminium, ferrochrome and ferro-molybdenum carry out molten steel composition；Add after refining slag agent and stop injection argon gas；4) application of vacuum；5) casting finished product；The present invention strengthens the strength and ductility product of steel by adjusting Mn/C in steel, obtains the yield strength of steel and the optimum value of plasticity；Improve the decay resistance of steel by adjusting Cu content, the cryogenic property of steel is improved by the content for adjusting Mn and Ni.
Description
Technical field
The present invention relates to field of steel metallurgy, the preparation of more particularly to a kind of ocean platform potassium steel and its continuous casting steel billet
Method.
Background technology
For a long time, the energy is always the focus that countries in the world are entered into rivalry, and each state is all carrying out oil and natural gas
Research, exploration and the exploitation of resource.However, the oil and natural gas resource on land far can not meet the need of social development
Ask, people just invest sight the ocean for containing the resources such as abundant oil and natural gas.But, explored offshore oil and
More than the 80% of natural gas resource reserves is located at below depth of water 500m blue water, and carries out opening for blue water marine resources
Send out and provide support it is necessary to have high-grade ocean platform.Offshore platform steel, as the important feature material of ocean platform
It is asked to have high intensity, high tenacity, antifatigue, anti-lamellar tearing, good solderability and cold-workability and sea water resistance
The performance indications such as corrosion.In recent years, it is high-strength, ductile steel to make in order to improve the security and mobility of offshore platform steel
Increased year by year with ratio.For example, high-strength steel accounts for high-strength steel in 55%~60%, semisubmersible drilling platform in self-elevating drilling platform
Account for 90.0%~97.5%, wherein the spud leg of platform, cantilever beam and upgrading rackwork etc. need 460~690MPa ranks and
The special-purpose steel such as the high intensity of more than 690MPa ranks or especially big thickness (maximum gauge reaches 259mm).
However, existing offshore platform steel is both needed to carry out alloying using substantial amounts of Cr, Mo, Ni, in order to ensure steel plate
Low-temperature flexibility, or even need the even more Ni elements of addition 4%, 9%, production cost is high, the crack sensitivity of continuous casting billet
By force, continuous casting billet quality it is difficult to ensure that, and Technology for Heating Processing is complicated, it is desirable to harsh, is unfavorable for large-scale production.
In recent years, the TWIP steel and TRIP steel of " Mn/C " alloying are in terms of solving body of a motor car light weight and improving security
The progress attracted people's attention is had been achieved with, people have new deeper understanding to the mechanisms of action of the Mn in steel.Mn and C be in steel most
Main strong austenite stabilizer element, significantly reduces austenite transformation temperature, plays fining austenite grains effect, can also have
The quenching degree of effect increase steel.In addition, Mn plays the role of similar, and cost on the influence of the microscopic structure and transformation behavior of steel to Ni
Only the 1/5~1/10 of Ni.There are some researches show, 5Mn steel through Overheating Treatment crystal grain thinning and improve stabilization of austenite obtain-
Excellent impact toughness at 196 DEG C.
The patent of invention of Patent No. 201310551550.8 there is provided a kind of Automotive high manganese steel and its manufacture method,
The steel grade carbon content is 0.55%~0.64%, belongs to middle carbon high manganese steel.In production process, closed for converter smelting, manganese element
The vacuum refining of aurification and molten steel requires relatively low.The patent focuses on heat treatment to potassium steel and the operation of rolling is set forth,
To how to produce, qualified potassium steel continuous casting billet, which but rarely has, is related to.However, because potassium steel hardness is big, thermal conductivity factor is low, steel
Chemical reaction between liquid and crystallizer protecting residue is strong, causes the crack defect of potassium steel continuous casting billet extremely serious, notably can have
Cause bleed-out accident；The potassium steel that the patent is provided is full austenite steel, and the requirement to heat treatment is relatively easy.Therefore, Gao Meng
The key of steel production is that being provided as continuous casting process provides high-quality molten steel and the determination of casting parameters and condition.
The patent No. be respectively 201310281531.8,201210133064.X, 201410345023.6,
201210074410.1 the patent of invention with 201310582009.3 is there is provided some potassium steel and its manufacture method, but this
A little potassium steel are all the high carbon high manganese steel for wearing piece, and are produced using induction furnace and molding, the inclusion content in steel is high,
Efficiency is low, cost is high and is unfavorable for large-scale industrial production.
Patent No. 201210133064.X patent of invention provides a kind of method for producing small billet potassium steel.Relatively
In small billet, the crack sensitivity of slab is strong, conticaster pulling rate is fast, and casting parameters also have very big difference.So, Gao Meng
The production difficulty of steel continuous casting steel billet is considerably beyond potassium steel small billet.
In order to overcome, the production cost of existing offshore platform steel is high, Technology for Heating Processing is complicated and potassium steel is smelted continuous casting and is stranded
The unfavorable conditions such as difficulty, realize high-quality offshore platform steel low cost, high-efficiency reform and potassium steel continuous casting steel billet it is smooth
Production, need to develop a kind of high manganese offshore platform steel and its continuous casting steel billet preparation method.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of 690MPa ranks ocean platform potassium steel and its continuous casting plate
The preparation method of base,
The ocean platform potassium steel of the present invention, composition is by mass percentage：C：0.04~0.06%, Si：0.15~
0.25%, Mn：4.85~5.55%, P：≤ 0.015%, S≤0.005%, Al：0.01~0.03%, Cu≤0.15%, Ni：
0.28~0.35%, Mo：0.16~0.3%, Cr：0.38~0.42%, N≤0.0065%, surplus is Fe.
The ocean platform potassium steel of the present invention, composition is preferably by mass percentage：C：0.045~0.06%, Si：
0.16~0.23%, Mn：5.00~5.55%, P：≤ 0.013%, S≤0.005%, Al：0.01~0.03%, Cu≤
0.15%, Ni：0.30~0.35%, Mo：0.22~0.3%, Cr：0.38~0.42%, N≤0.0065%, surplus is Fe.
The ocean platform potassium steel of the present invention, its yield strength >=690MPa, the contraction percentage of area >=20%, ballistic work (-
40℃)≥80J.The ocean platform potassium steel of the present invention, its corrosion resistance and weldability meet classification society to ocean platform
With the requirement of steel.
The preparation method of the ocean platform potassium steel continuous casting steel billet of the present invention, flow is：Blast furnace-molten iron pretreatment-turns
Stove-LF refining-VD or RH application of vacuum-sheet billet continuous casting-continuous casting billet stacking slow cooling；Specifically include following steps：
Step 1, blast-melted pretreatment：
By blast-melted pretreatment, it is S≤0.004%, Si to make its mass percent for containing composition：0.20~
0.50%, P≤0.090%；Blast-melted temperature is molten iron temperature >=1300 DEG C；
Step 2, converter smelting：
(1) steel scrap is added to converter, is then poured into blast-melted in converter, point 2 addition slag formers are added for the first time
After slag former, oxygen blast processing is carried out to converter, surplus slag former is added, 25~30min of melting in converter contains molten steel
The mass percent of composition is：C≤0.035%, P≤0.008%, S≤0.006%；Wherein, in mass ratio, steel scrap: blast furnace iron
Water=(2~3): (17~18)；The quality of 2 slag formers and: steel scrap and blast-melted quality and=(6~9): 100；Oxygen
Flow be 380~440m3/ min, the time of oxygen blast processing is 10~15min；
(2) amount of manganese metal in 1.05~1.2 times of theoretical potassium steel is added into ladle；
(3) aluminum-manganese-iron alloy for adding molten steel gross weight 0.35~0.40% in tapping process into ladle carries out pre-deoxidation,
And adding ladle covering agent into ladle, its addition is to ensure that molten steel face is not exposed in atmosphere；During converter tapping, molten steel goes out
Steel temperature is 1675~1695 DEG C, and the tapping time is 3.5~5min；
Step 3, LF refining：
(1) start Argon when ladle enters LF stations, add W metal, Mo and Cu, be eventually adding aluminium, ferrochrome and molybdenum
Ferroalloy carries out the fine setting of molten steel composition, and the composition for containing molten steel is C by mass percentage：≤ 0.07%, Si：0.15~
0.25%, Mn：4.85~5.55%, P：≤ 0.013%, S≤0.005%, Al：0.01~0.03%, Cu≤0.15%, Ni：
0.28~0.35%, Mo：0.18~0.3%, Cr：0.38~0.42%, N≤0.0065%, surplus is Fe；
(2) enter after LF stations, be initially powered up heating and refining slag agent is added into ladle, stop after 50~60min of refining
Argon gas is blown, liquid steel temperature is 1610~1620 DEG C；
Step 4, application of vacuum：
Application of vacuum is carried out to the molten steel in ladle, makes ladle vacuum in more than 300Pa；
Step 5, casting finished product：
(1) continuous casting production is toasted, baking temperature is 1100~1200 DEG C, baking time >=3h；
(2) continuous casting production for making the molten steel in ladle flow into after baking, it is 1523~1526 DEG C to control liquid steel temperature；Such as
Fruit liquid steel temperature is less than 1523 DEG C, then is heated to 1543~1546 DEG C in the ladle of return to step 3 (1), then carries out step 5；
If liquid steel temperature is higher than 1526 DEG C, in continuous casting production, 1523~1526 DEG C are naturally cooling to；
(3) by the molten steel in continuous casting production, crystallizer is molded into, covering slag is then added into crystallizer, makes slag blanket
Gross thickness is 40 ± 5mm；
(4) go out billet from crystallizer, after being cooled down in two cold-zones, stacking slow cooling is carried out immediately.
Wherein：
Described step 1, is pre-processed in torpedo tank car or ladle, steel is poured into by blast-melted after pretreatment
Bag.
In described step 2 (1), converter is in steelmaking furnace molten iron, and previous stove does not splash slag, to ensure the cleaning of molten steel
Degree.
In described step 2 (1), slag former is active lime, light dolomite and a small amount of fluorite.
In described step 2 (1), points of 2 times additions of slag former, first time addition for slag former gross mass 65~
75%, when blowing to carbon 1.6~2.0%, the slagging of falling stove, second of addition surplus continues to blow；1. the consumption of slag former passes through
The proportionate relationship of slag and molten steel, 2. slag slag basicity (w (CaO)/w (SiO2)=2.5~3.0) determine, active lime
Amount be the 65~75% of slag former gross mass, the amount of light dolomite is the 22~25% of slag former gross mass, the amount of fluorite
For slag former gross mass 0~5%.
In described step 2 (1), steel scrap is to sentence the high-quality steel scraps such as steel scrap kind, shearing material.
In described step 2 (2), molten steel tapping temperature capping, to reduce LF stoves heating burden.
In described step 2 (2), tapping is in circular jet；Slag retaining cone or skimming ball pushing off the slag are used during tapping, is forbidden under tapping
Slag.
In described step 2 (3), the addition operation of manganese metal is：1/3~2/3 times of reality is added before tapping into ladle
Surplus manganese metal is added in manganese metal quality, tapping process.
In described step 3 (1), the amount of injection argon gas is 550~800L/min.
In described step 3 (1), aluminium is added in carbon-free aluminum steel form, and ferrochrome and molybdenum-iron are low-carbon alloy.
In described step 3 (2), refining slag agent is pre-melted slag, and its composition and its weight/mass percentage composition are：CaO：50~
55%, SiO2：5~8%, Al2O3：25~32%, MgO：6~8%, CaF2：1~3%, refining slag agent addition is that molten steel is total
The 0.8~1.2% of amount.
In described step 4, application of vacuum is VD applications of vacuum or RH application of vacuum.
In described step 4, time≤25min of application of vacuum.
In described step 5 (2), it is heated to if liquid steel temperature is less than in 1523 DEG C, the ladle of return to step 3 (1)
1543~1546 DEG C, then carry out step 5；It is because being had by the molten steel in the process of step 3 (1) to step 5 (2), ladle
Temperature drop；Return to step 3 (1) is in order to raise the temperature of molten steel, so without step 3 (2) and step 4.
In described step 5 (3), crystallizer is furnished with conventional water cooling plant.
In described step 5 (3), covering slag is low-carbon micro steel-alloy covering slag.
In described step 5 (4), two cold-zones are using superweak cold.
In described step 5 (4), billet is quick offline after being cooled down in two cold-zones, is not stopped in roller-way, heap is carried out immediately
Pile slow cooling.
The ocean platform potassium steel of the present invention and its preparation method of continuous casting steel billet, by adjusting Mn/C ratios in steel, are adjusted
The chemical composition of whole steel, and then the strength and ductility product of steel is adjusted, obtain the yield strength of steel and the optimum value of plasticity.By adjusting Cu's
Content improves the decay resistance of steel, and the cryogenic property of steel is improved by the content for adjusting Mn and Ni.
Brief description of the drawings
Ocean platform potassium steel continuous casting billet low power scanned photograph prepared by Fig. 1 embodiment of the present invention 1.
Embodiment
Embodiment 1
A kind of ocean platform potassium steel, composition is as shown in table 1 by mass percentage：
The high manganese offshore platform steel continuous casting billet composition (%) of table 1
The preparation method of ocean platform potassium steel continuous casting steel billet, flow is：Blast furnace-molten iron pretreatment-converter-LF essences
Refining-VD or RH application of vacuum-sheet billet continuous casting-continuous casting billet stacking slow cooling；Specifically include following steps：
Step 1, blast-melted pretreatment：
By blast-melted in torpedo tank car pretreatment, slag is thoroughly scratched clean after desulfurization, the quality percentage for making it contain composition
Than for S≤0.0018%, Si：0.38%, P：0.070%；Blast-melted temperature is that molten iron temperature is 1320 DEG C；Then by height
Stove molten iron pours into ladle；
Step 2, converter smelting：
(1) add 14 tons of high-quality steel scrap to converter, then by 86 tons it is blast-melted pour into converter, add points for 2 times
8t slag formers, including 5.6t active limes, 2t light dolomites and 400kg fluorites, first time addition are 5.6t, including
3.92t active limes, 1.4t light dolomites and 280kg fluorites, then carry out oxygen blast processing, blowing to carbon 1.6% to molten steel
When, stop oxygen blast, adjustment converter angle carries out deslagging, then adds 2.4t slag former, including 1.68t active limes,
0.6t light dolomites and 120kg fluorites, the melting 25min in converter make the mass percent that molten steel contains composition be：C≤
0.035%, P≤0.008%, S≤0.006%；Wherein, the flow of oxygen is 400m3/ min, oxygen blast processing time be
12min；
(2) amount of manganese metal in 5.3 tons of theoretical potassium steel is added into ladle；The addition of manganese metal is operated：Tapping
Added in forward direction ladle and 2.3 tons of manganese metals are added in 3 tons of manganese metal quality, tapping process；
(3) aluminum-manganese-iron alloy for adding molten steel gross weight 380kg in tapping process into ladle carries out pre-deoxidation, and to ladle
Middle addition ladle covering agent, its addition is to ensure that molten steel face is not exposed in atmosphere；During converter tapping, molten steel tapping temperature is
1692 DEG C, the tapping time is 4min；
Step 3, LF refining：
(1) Argon is started when ladle enters LF stations, the amount of injection argon gas is 600L/min, adds 160kg low aluminum silicon iron,
520kg low-carbon ferrochromiums, 303kg electrolytic nickels, 71kg cathode coppers and 300kg molybdenum-irons, are eventually adding 110kg aluminum steels section, 151kg low-carbons
Ferrochrome and 10kg molybdenum-irons, carry out the fine setting of molten steel composition, and the composition for containing molten steel is C by mass percentage：≤ 0.07%,
Si：0.15~0.25%, Mn：4.85~5.55%, P：≤ 0.013%, S≤0.005%, Al：0.01~0.03%, Cu≤
0.15%, Ni：0.28~0.35%, Mo：0.18~0.3%, Cr：0.38~0.42%, N≤0.0065%, surplus is Fe；
(2) enter after LF stations, be initially powered up stopping injection argon after heating and adding into ladle pre-melted slag, refining 57min
Gas, liquid steel temperature is 1617 DEG C；Wherein, the composition and weight/mass percentage composition of pre-melted slag are CaO：53%, SiO2：5%, Al2O3：
32%, MgO：8%, CaF2：2%, pre-melted slag addition is 1 ton of molten steel total amount；
Step 4, application of vacuum：
VD applications of vacuum are carried out to the molten steel in ladle, the time of application of vacuum is 20min, ladle vacuum is existed
More than 300Pa；
Step 5, casting finished product：
(1) continuous casting production is toasted, baking temperature is 1140 DEG C, and baking time is 3.5h；
(2) continuous casting production for making the molten steel in ladle flow into after baking, it is 1526 DEG C to control liquid steel temperature；
(3) by the molten steel in continuous casting production, the crystallizer equipped with conventional water cooling plant is molded into, then into crystallizer
Low-carbon micro steel-alloy covering slag is added, it is 41mm to make slag blanket gross thickness；
(4) billet is gone out from crystallizer, after being cooled down in two cold-zones, the water distribution situation of two cold-zones as shown in table 2, carries out heap immediately
Pile slow cooling；Wherein, billet is pulled out from crystallizer, automatically increases the speed to pulling rate for 1.0m/min, then Cheng Heng pulling rates are operated.
The ocean platform potassium steel of the present embodiment, its casting blank cross-section size is：230mm × 1650mm, its yield strength
For 700MPa, the contraction percentage of area is 30%, and (- 60 DEG C) of ballistic work is 102J；The ocean platform of the present embodiment potassium steel continuous casting
As shown in table 3, its corrosion resistance and weldability meet requirement of the classification society to offshore platform steel to base low-magnification report.
The ocean platform potassium steel of the present embodiment, ocean platform manufactured in the present embodiment is swept with potassium steel continuous casting billet low power
Retouch photo as shown in Figure 1；
The Secondary Cooling Zone of Continuous Caster water distribution situation of table 2
| Two cold-zone titles | Live cooling circuit title | Live minimum amount of water, m3/h |
| One area | 1.1 | 23.0 |
| 2nd area | 2 | 16.1 |
| 3rd area | 3 | 18.0 |
| 4th area | 4 | 8.8 |
| 5th area | 5 | 14.0 |
| 6th area | 6 | 7.3 |
| 7th area | 7 | 3.2 |
| Air cooling zone | 8 | 0.4 |
| NL | 1.0 | 3.7 |
| Total Water | \ | 94.5 |
The ocean platform of table 3 potassium steel continuous casting billet low-magnification report
Embodiment 2
A kind of ocean platform potassium steel, composition is as shown in table 4 by mass percentage：
The high manganese offshore platform steel continuous casting billet composition (%) of table 4
| C | Si | Mn | P | S | Cr | Mo | Ni | Al | N | Fe |
| 0.05 | 0.21 | 5.50 | 0.009 | 0.005 | 0.37 | 0.25 | 0.30 | 0.020 | 0.006 | Surplus |
The preparation method of ocean platform potassium steel continuous casting steel billet, flow is：Blast furnace-molten iron pretreatment-converter-LF essences
Refining-VD or RH application of vacuum-sheet billet continuous casting-continuous casting billet stacking slow cooling；Specifically include following steps：
Step 1, blast-melted pretreatment：
Pre-process, thoroughly scratch clean slag after desulfurization, the quality hundred for making it contain composition in torpedo tank car by blast-melted
Divide than being S≤0.0018%, Si：0.35%, P：0.066%；Blast-melted temperature is that molten iron temperature is 1330 DEG C；Then will
It is blast-melted to pour into ladle；
Step 2, converter smelting：
(1) add 13 tons of high-quality steel scrap to converter, then by 87 tons it is blast-melted pour into converter, add points for 2 times
8.2t slag formers, including 5.74t active limes, 2.1t light dolomites and 360kg fluorites, first time addition are 5.74t, bag
4.02t active limes, 1.48t light dolomites and 240kg fluorites are included, oxygen blast processing, blowing to carbon are then carried out to molten steel
When 1.66%, stop oxygen blast, adjustment converter angle carries out deslagging, then add 2.46t slag former, including 1.72t activity
Lime, 0.62t light dolomites and 120kg fluorites, the melting 25min in converter, the mass percent for making molten steel contain composition
For：C≤0.033%, P≤0.008%, S≤0.006%；Wherein, the flow of oxygen is 420m3/ min, the time of oxygen blast processing
For 11min；
(2) amount of manganese metal in 5.35 tons of theoretical potassium steel is added into ladle；The addition of manganese metal is operated：Tapping
Added in forward direction ladle and 2.15 tons of manganese metals are added in 3.2 tons of manganese metal quality, tapping process；
(3) aluminum-manganese-iron alloy for adding molten steel gross weight 380kg in tapping process into ladle carries out pre-deoxidation, and to ladle
Middle addition ladle covering agent, its addition is to ensure that molten steel face is not exposed in atmosphere；During converter tapping, molten steel tapping temperature is
1689 DEG C, the tapping time is 3.5min；
Step 3, LF refining：
(1) Argon is started when ladle enters LF stations, the amount of injection argon gas is 650L/min, adds 161kg low aluminum silicon iron,
521kg low-carbon ferrochromiums, 303kg electrolytic nickels, 71kg cathode coppers and 300kg molybdenum-irons, are eventually adding 112kg aluminum steels section, 151kg low-carbons
Ferrochrome and 10kg molybdenum-irons, carry out the fine setting of molten steel composition, and the composition for containing molten steel is C by mass percentage：≤ 0.07%,
Si：0.15~0.25%, Mn：4.85~5.55%, P：0.01~0.015%, S≤0.005%, Al：0.01~0.03%, Cu
≤ 0.15%, Ni：0.28~0.35%, Mo：0.18~0.3%, Cr：0.38~0.42%, N≤0.0065%, surplus is Fe；
(2) enter after LF stations, be initially powered up stopping injection argon after heating and adding into ladle pre-melted slag, refining 55min
Gas, liquid steel temperature is 1620 DEG C；Wherein, the composition and weight/mass percentage composition of pre-melted slag are CaO：53%, SiO2：5%, Al2O3：
32%, MgO：8%, CaF2：2%, pre-melted slag addition is 0.95 ton of molten steel total amount；
Step 4, application of vacuum：
VD applications of vacuum are carried out to the molten steel in ladle, the time of application of vacuum is 22min, ladle vacuum is existed
305Pa；
Step 5, casting finished product：
(1) continuous casting production is toasted, baking temperature is 1145 DEG C, and baking time is 3.5h；
(2) continuous casting production for making the molten steel in ladle flow into after baking, it is 1524 DEG C to control liquid steel temperature；
(3) by the molten steel in continuous casting production, the crystallizer equipped with conventional water cooling plant is molded into, then into crystallizer
Low-carbon micro steel-alloy covering slag is added, it is 40mm to make slag blanket gross thickness；
(4) billet is gone out from crystallizer, after being cooled down in two cold-zones, the water distribution situation of two cold-zones as shown in table 2, carries out heap immediately
Pile slow cooling；Wherein, billet is pulled out from crystallizer, automatically increases the speed to pulling rate for 1.0m/min, then Cheng Heng pulling rates are operated.
The ocean platform potassium steel of the present embodiment, its casting blank cross-section size is：230mm × 1650mm, its yield strength
For 705MPa, the contraction percentage of area is 30.1%, and (- 60 DEG C) of ballistic work is 105J.
Claims (7)
1. a kind of ocean platform preparation method of potassium steel continuous casting steel billet, it is characterised in that the potassium steel composition
It is by mass percentage：C：0.04 ~ 0.06%, Si：0.15 ~ 0.25%, Mn：4.85 ~ 5.55%, P≤0.015%, S≤
0.005 %, Al:0.01 ~ 0.03%, Cu≤0.15%, Ni:0.28 ~ 0.35%, Mo:0.16 ~ 0.3%, Cr:0.38 ~ 0.42%, N
≤ 0.0065 %, surplus is Fe；Specifically include following steps：
Step 1, blast-melted pretreatment：
By blast-melted pretreatment, it is S≤0.004%, Si to make its mass percent for containing composition:0.20 ~ 0.50%, P≤
0.090%；Blast-melted temperature is molten iron temperature >=1300 DEG C；
Step 2, converter smelting：
(1) steel scrap is added to converter, is then poured into blast-melted in converter, point 2 addition slag formers add make for the first time
After slag agent, oxygen blast processing is carried out to converter, surplus slag former is added, 25 ~ 30min of melting in converter contains into molten steel
Point mass percent be:C≤0.035%, P≤0.008%, S≤0.006%；Wherein, in mass ratio, steel scrap:Blast-melted=(2
~3):(17~18)；The quality of 2 slag formers and:Steel scrap and blast-melted quality and=(6 ~ 9):100；The flow of oxygen is
380 ~ 440m3/min, the time of oxygen blast processing is 10 ~ 15min；
(2) amount of manganese metal in 1.05 ~ 1.2 times of theoretical potassium steel is added into ladle；
(3) aluminum-manganese-iron alloy for adding molten steel gross weight 0.35 ~ 0.40% in tapping process into ladle carries out pre-deoxidation, and to
Ladle covering agent is added in ladle, its addition is to ensure that molten steel face is not exposed in atmosphere;During converter tapping, molten steel tapping
Temperature is 1675 ~ 1695 DEG C, and the tapping time is 3.5~5min；
Step 3, LF is refined：
(1) start Argon when ladle enters LF stations, add W metal, Mo and Cu, be eventually adding aluminium, ferrochrome and
Ferro-molybdenum carries out the fine setting of molten steel composition, and the composition for containing molten steel is C by mass percentage:≤ 0.07%, Si:0.15~
0.25%, Mn:4.85 ~ 5.55%, P:≤ 0.013%, S≤0.005%, Al:0.01 ~ 0.03%, Cu≤0.15%, Ni:0.28~
0.35%, Mo:0.18 ~ 0.3%, Cr:0.38 ~ 0.42%, N≤0.0065%, surplus is Fe；
(2) enter after LF stations, be initially powered up heating and refining slag agent is added into ladle, stop after 50 ~ 60min of refining
Argon gas is blown, liquid steel temperature is 1610 ~ 1620 DEG C；
Step 4, application of vacuum:Application of vacuum is carried out to the molten steel in ladle, makes ladle vacuum in more than 300Pa；
Step 5, casting finished product：
(1) continuous casting production is toasted, baking temperature is 1100 ~ 1200 DEG C, baking time >=3h；
(2) continuous casting production for making the molten steel in ladle flow into after baking, it is 1523 ~ 1526 DEG C to control liquid steel temperature;If
Liquid steel temperature is less than 1523 DEG C, then is heated to 1543 ~ 1546 DEG C in the ladle of return to step 3 (1), then carries out step
5;If liquid steel temperature is higher than 1526 DEG C, in continuous casting production, 1523 ~ 1526 DEG C are naturally cooling to；
(3) by the molten steel in continuous casting production, crystallizer is molded into, covering slag is then added into crystallizer, make slag blanket total thickness
Spend for 40 ± 5mm；
(4) go out billet from crystallizer, after being cooled down in two cold-zones, stacking slow cooling is carried out immediately.
2. the ocean platform according to claim 1 preparation method of potassium steel continuous casting steel billet, it is characterised in that described
In step 2 (1), slag former is active lime, light dolomite and fluorite.
3. the ocean platform according to claim 1 preparation method of potassium steel continuous casting steel billet, it is characterised in that described
In step 2 (1), 2 additions of slag former point, first time addition is the 65 ~ 75% of slag former gross mass, blowing to carbon 1.6
When ~ 2.0%, the slagging of falling stove, second of addition surplus continues to blow;The ratio that the consumption of slag former passes through 1. slag and molten steel
Relation, 2. slag slag basicity Cw (CaO)/w (SiO2)=2.5 ~ 3.0) determine that the amount of active lime is slag former gross mass
65 ~ 75%, the amount of light dolomite is the 22 ~ 25% of slag former gross mass, and the amount of fluorite is 0 ~ 5 % of slag former gross mass,
Active lime, light dolomite and fluorite account for the 100% of slag former gross mass.
4. the ocean platform according to claim 1 preparation method of potassium steel continuous casting steel billet, it is characterised in that described
In step 2 (2), the addition operation of manganese metal is：1/3 ~ 2/3 times of actual metal manganese quality is added before tapping into ladle, is gone out
Surplus manganese metal is added during steel.
5. the ocean platform according to claim 1 preparation method of potassium steel continuous casting steel billet, it is characterised in that described
In step 3 (1), the amount of injection argon gas is 550 ~ 800L/min.
6. the preparation method of the ocean platform potassium steel continuous casting steel billet according to claim 1, it is characterised in that described
Step 3 (2) in, refining slag agent be pre-melted slag, its composition and its weight/mass percentage composition are:CaO：50 ~ 55%, SiO：2:5~8
%, Al2O3：25 ~ 32%, MgO：6 ~ 8%, CaF2：1 ~ 3%, refining slag agent addition is the 0.8 ~ 1.2% of molten steel total amount.
7. the ocean platform according to claim 1 preparation method of potassium steel continuous casting steel billet, it is characterised in that described
In step 4, application of vacuum is DV applications of vacuum or RH applications of vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610497312.7A CN105908080B (en) | 2016-06-30 | 2016-06-30 | A kind of ocean platform potassium steel and its continuous casting steel billet preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610497312.7A CN105908080B (en) | 2016-06-30 | 2016-06-30 | A kind of ocean platform potassium steel and its continuous casting steel billet preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105908080A CN105908080A (en) | 2016-08-31 |
| CN105908080B true CN105908080B (en) | 2017-09-29 |
Family
ID=56753658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610497312.7A Active CN105908080B (en) | 2016-06-30 | 2016-06-30 | A kind of ocean platform potassium steel and its continuous casting steel billet preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105908080B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109112418B (en) * | 2017-06-26 | 2020-09-01 | 鞍钢股份有限公司 | Continuous casting method of high manganese steel |
| CN109957731B (en) * | 2017-12-14 | 2020-09-01 | 鞍钢股份有限公司 | High-manganese medium-thickness steel plate for ocean engineering and production method thereof |
| CN108456762A (en) * | 2018-02-28 | 2018-08-28 | 江苏省沙钢钢铁研究院有限公司 | The control method of Ds type impurities in a kind of alloy tool steel |
| CN109750210B (en) * | 2018-12-29 | 2020-09-22 | 广西长城机械股份有限公司 | Production method of low-oxygen high-hydrogen-content manganese steel |
| CN109487178B (en) * | 2018-12-29 | 2020-06-16 | 广西长城机械股份有限公司 | High-purity ultrahigh manganese steel and preparation process thereof |
| CN110724792B (en) * | 2019-09-30 | 2021-08-24 | 河钢股份有限公司 | Smelting method for producing high manganese steel for low-temperature environment by using LF refining furnace |
| CN112853026B (en) * | 2021-01-06 | 2022-10-18 | 鞍钢股份有限公司 | Manganese alloying method for smelting high manganese steel by converter |
| CN112813351B (en) * | 2021-01-06 | 2022-06-14 | 鞍钢股份有限公司 | High manganese steel and smelting method thereof |
| CN113927025B (en) * | 2021-09-15 | 2023-01-17 | 东北大学 | Chromium ladle drainage sand for high-manganese high-aluminum steel and preparation and use methods thereof |
| CN115323251B (en) * | 2022-08-24 | 2023-06-27 | 东北大学 | Super-thick steel plate for super-thick high-strength high-homogeneity hydropower and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718832A (en) * | 2005-07-19 | 2006-01-11 | 武汉钢铁(集团)公司 | 600MPa grade low temperature high toughness weather corrosion resistant steel and its production method |
| CN104805378A (en) * | 2015-05-13 | 2015-07-29 | 东北大学 | High strength and toughness ultra-low carbon medium manganese steel middle-thickness plate and preparation method thereof |
-
2016
- 2016-06-30 CN CN201610497312.7A patent/CN105908080B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718832A (en) * | 2005-07-19 | 2006-01-11 | 武汉钢铁(集团)公司 | 600MPa grade low temperature high toughness weather corrosion resistant steel and its production method |
| CN104805378A (en) * | 2015-05-13 | 2015-07-29 | 东北大学 | High strength and toughness ultra-low carbon medium manganese steel middle-thickness plate and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105908080A (en) | 2016-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105908080B (en) | A kind of ocean platform potassium steel and its continuous casting steel billet preparation method | |
| CN102212757B (en) | Alloy steel for large wind-driven power generation device and manufacturing process of workpiece made of same | |
| CN108315646B (en) | Hot-rolled round steel produced by continuous casting and production method thereof | |
| CN102433503A (en) | Wind power flange alloy steel and preparation technology of parts thereof | |
| CN101921953A (en) | Production method of anti-corrosion and high strength ultra-thick steel plates | |
| CN105543678A (en) | Steel wire rod for high-strength boron-contained and annealing-free fastening piece and preparation method thereof | |
| CN103556055B (en) | For the hot rolled H-shaped and production method of ocean natural gas production platform structure | |
| CN104043797B (en) | The continuous cast method of a kind of super-low sulfur high chrome and the bloom of preparation thereof | |
| CN102816979A (en) | Production method of low-carbon sulfur series free-cutting steel continuous casting billet | |
| CN109706404B (en) | Titanium-containing carbon steel and production method thereof | |
| CN103642970A (en) | Smelting method of low-carbon aluminum killed steel | |
| CN107236905A (en) | 600MPa grade high-strength low yield strength ratio structural steel and irons and its manufacture method | |
| CN107354269A (en) | The method that RH complex deoxidizations produce ultra-low-carbon steel | |
| WO2023000479A1 (en) | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor | |
| CN105088087B (en) | High-toughness optimal welding micro-alloyed cast steel and preparation method thereof | |
| CN101318287A (en) | Method for manufacturing 460Mpa high-toughness medium plate for bridge | |
| CN110564914A (en) | Method for improving low-temperature impact toughness of low-alloy bainite steel by rare earth microalloying | |
| CN100366777C (en) | High temperature creep-resisting furnace shell material and its preparation method | |
| CN112877587A (en) | Method for smelting high-manganese TWIP steel by adopting electric arc furnace and ladle refining furnace | |
| CN103114248B (en) | Steel for drilling tools and method for smelting steel for drilling tools | |
| CN109930064A (en) | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method | |
| CN113684412B (en) | Production method of plastic die steel ZW636 | |
| CN114959496A (en) | Production method of container steel Q345R resistant to hydrogen sulfide corrosion | |
| CN108998727A (en) | A kind of wear-resisting, impact-resistant micro-alloyed with Nb and Ti high-carbon alloy steel and its production method by force | |
| CN111926137B (en) | Preparation method for producing ship plate by adopting high-phosphorus, high-arsenic and high-sulfur molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |