CN105908080A - Preparation method for high-manganese steel for ocean platform and continuous casting slab of high-manganese steel - Google Patents

Preparation method for high-manganese steel for ocean platform and continuous casting slab of high-manganese steel Download PDF

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CN105908080A
CN105908080A CN201610497312.7A CN201610497312A CN105908080A CN 105908080 A CN105908080 A CN 105908080A CN 201610497312 A CN201610497312 A CN 201610497312A CN 105908080 A CN105908080 A CN 105908080A
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steel
slag
continuous casting
ladle
ocean platform
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CN105908080B (en
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孔令种
蔡兆镇
朱苗勇
杨杰
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Northeastern University China
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    • 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

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  • 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

The invention discloses a preparation method for high-manganese steel for an ocean platform and continuous casting slab of the high-manganese steel, wherein the high-manganese steel consists of the following components: C, Si, Mn, P, S, Al, C, Ni, Mo, Cr, N and Fe. The preparation method comprises the following steps: 1) pre-treating blast-furnace molten iron; 2) carrying out converter smelting: adding waste steel into a converter, pouring the blast-furnace molten iron into the converter, adding a slag forming constituent in twice, then adding manganese, an aluminum-manganese-iron alloy, and tapping steel after adding a covering agent; 3) carrying out LF refining: adding metals which are Ni, Mo and Cu while carrying out argon blowing, and finally, adding the aluminum, ferrochrome and ferro-molybdenum to fine regulate components of molten steel; and stopping spraying and blowing argon gas after adding a refining slag agent; 4) carrying out vacuum treatment; and 5) casting a finished product. According to the preparation method, a strength and ductility product of Mn/C reinforced steel in steel is regulated, so that optimum values of yield strength and plasticity of steel are obtained; and the corrosion resistance of steel is improved by regulating content of Cu, and low-temperature performances of steel are improved by regulating content of Mn and Ni.

Description

A kind of ocean platform potassium steel and continuous casting steel billet preparation method thereof
Technical field
The present invention relates to field of steel metallurgy, particularly to a kind of ocean platform potassium steel and the preparation method of continuous casting steel billet thereof.
Background technology
For a long time, the focus entered into rivalry in the energy always countries in the world, each state is all carrying out oil and natural gas resource Study, explore and develop.But, the oil and natural gas resource on land can not meet the most far away the demand of social development, people Just sight is invested the ocean containing the resources such as abundant oil and natural gas.But, explored offshore oil and natural gas money More than the 80% of source reserves is positioned at the region, deep-sea of below depth of water 500m, and the exploitation carrying out region, deep-sea marine resources have to Have high-grade ocean platform to provide to support.Offshore platform steel is as the important feature material of ocean platform, it is desirable to it must have There are high intensity, high tenacity, resisting fatigue, anti-lamellar tearing, good solderability and cold-workability and seawater corrosion resistance etc. property Can index.In recent years, in order to improve safety and the mobility of offshore platform steel, the use ratio of high-strength, ductile steel by Year increases.Such as, in self-elevating drilling platform, high-strength steel accounts for 55%～60%, in semisubmersible drilling platform high-strength steel account for 90.0%～ 97.5%, wherein the spud leg of platform, cantilever beam and upgrading rackwork etc. need 460～690MPa ranks and 690MPa with The special-purpose steel such as the other high intensity of higher level or especially big thickness (maximum gauge reaches 259mm).
But, existing offshore platform steel is both needed to use substantial amounts of Cr, Mo, Ni to carry out alloying, in order to ensure steel plate Low-temperature flexibility, even needs to add 4%, 9% even more Ni element, and production cost is high, and the crack sensitivity of continuous casting billet is strong, 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 of " Mn/C " alloying and TRIP steel in terms of solving body of a motor car light weight and improving safety Through the progress that attracts people's attention of acquirement, people have had new deeper understanding to the Mn mechanism of action in steel.Mn and C is in steel Topmost strong austenite stabilizer element, significantly reduces austenite transformation temperature, plays fining austenite grains effect, also can It is effectively increased the quenching degree of steel.It addition, Mn has similar effect with transformation behavior impact to Ni on the microscopic structure of steel, and Cost only has the 1/5～1/10 of Ni.There are some researches show, 5Mn steel obtains through Overheating Treatment crystal grain thinning and raising stabilization of austenite Obtain the excellent impact toughness at-196 DEG C.
The patent of invention of Patent No. 201310551550.8, it is provided that a kind of Automotive high manganese steel and manufacture method, this steel grade Carbon content is 0.55%～0.64%, belongs to middle carbon high manganese steel.In production process, for converter smelting, manganese element alloying and steel The vacuum refining of liquid requires relatively low.Heat treatment and the operation of rolling of potassium steel is set forth, to how to produce emphatically by this patent Go out qualified potassium steel continuous casting billet but to rarely have and relate to.But, owing to potassium steel hardness is big, heat conductivity is low, molten steel and crystallizer Chemical reaction between covering slag is strong, and the crack defect causing potassium steel continuous casting billet is extremely serious, has and notably can cause bleed-out accident； The potassium steel that this patent provides is full austenite steel, and the requirement to heat treatment is relatively easy.Therefore, the key that potassium steel produces exists High-quality molten steel and casting parameters and the determination of condition is provided in being provided as continuous casting process.
The patent No. is respectively 201310281531.8,201210133064.X, 201410345023.6,201210074410.1 and The patent of invention of 201310582009.3, it is provided that some potassium steel and manufacture method thereof, but these potassium steel are all for resistance to The high carbon high manganese steel of mill part, and use induction furnace and molding to produce, inclusion content in steel is high, efficiency is low, cost is high and not It is beneficial to large-scale industrial production.
The patent of invention of Patent No. 201210133064.X provides a kind of method producing small billet potassium steel.Relative to little side Base, the crack sensitivity of slab is strong, conticaster pulling rate is fast, and casting parameters also has the biggest difference.So, potassium steel is even The production difficulty of cast panel base is considerably beyond potassium steel small billet.
In order to overcome the production cost height of existing offshore platform steel, Technology for Heating Processing complexity and potassium steel smelting continuous casting difficulty etc. no Profit condition, it is achieved the smooth production of the low cost of high-quality offshore platform steel, high-efficiency reform and potassium steel continuous casting steel billet, needs Develop a kind of high manganese offshore platform steel and continuous casting steel billet preparation method thereof.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of 690MPa rank ocean platform potassium steel and continuous casting steel billet thereof Preparation method,
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 DEG C) ≥80J.The ocean platform potassium steel of the present invention, its corrosion resistance and weldability meet classification society and want offshore platform steel Ask.
The ocean platform of the present invention preparation method of potassium steel continuous casting steel billet, flow process is: blast furnace-molten iron pretreatment-converter-LF essence 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 so that it is the mass percent containing composition is S≤0.004%, Si:0.20～0.50%, P≤0.090%； Blast-melted temperature is molten iron temperature >=1300 DEG C；
Step 2, converter smelting:
(1) add steel scrap to converter, then pour in converter by blast-melted, point 2 addition slag formers, add for the first time and makes After slag agent, converter is carried out oxygen blast process, add surplus slag former, melting 25～30min in converter, make molten steel contain into The mass percent divided is: 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 It is 380～440m3/ min, the time that oxygen blast processes is 10～15min；
(2) in ladle, add the amount of manganese metal in the theoretical potassium steel of 1.05～1.2 times；
(3) tapping process adds in ladle molten steel gross weight 0.35～0.40% aluminum-manganese-iron alloy carry out pre-deoxidation, and to ladle Middle addition ladle covering agent, its addition is the most exposed in atmosphere to ensure molten steel face；During converter tapping, molten steel tapping temperature is 1675～1695 DEG C, the tapping time is 3.5～5min；
Step 3, LF refine:
(1) ladle starts Argon when entering LF station, adds W metal, Mo and Cu, is eventually adding aluminum, ferrochrome and molybdenum Ferroalloy carries out the fine setting of molten steel composition, and the composition making molten steel contain is C :≤0.07%, Si:0.15～0.25% by mass percentage, 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) after entering LF station, it is initially powered up heating and in ladle, adds refining slag agent, after refining 50～60min, stopping winding-up Argon, liquid steel temperature is 1610～1620 DEG C；
Step 4, application of vacuum:
Molten steel in ladle is carried out application of vacuum, makes ladle vacuum at more than 300Pa；
Step 5, finished product of casting:
(1) being toasted by continuous casting production, baking temperature is 1100～1200 DEG C, baking time >=3h；
(2) continuous casting production after making the molten steel in ladle flow into baking, controlling liquid steel temperature is 1523～1526 DEG C；If molten steel Temperature is less than 1523 DEG C, then return in the ladle of step 3 (1) and be heated to 1543～1546 DEG C, then carry out step 5；If molten steel Temperature is higher than 1526 DEG C, then, in continuous casting production, be naturally cooling to 1523～1526 DEG C；
(3) by the molten steel in continuous casting production, it is molded into crystallizer, in crystallizer, then adds covering slag, make slag blanket total thickness Degree is 40 ± 5mm；
(4) go out billet from crystallizer, after two cold-zone coolings, carry out stacking slow cooling immediately.
Wherein:
Described step 1, carries out pretreatment in torpedo tank car or ladle, pours ladle into by blast-melted after pretreatment.
In described step 2 (1), converter is when steelmaking furnace molten iron, and previous stove does not spatter slag, to ensure the cleanliness factor of molten steel.
In described step 2 (1), slag former is active lime, light dolomite and a small amount of fluorite.
In described step 2 (1), slag former divides 2 additions, and addition is the 65～75% of slag former gross mass for the first time, blowing During to carbon 1.6～2.0%, the slagging of falling stove, second time adds surplus, continues blowing；The consumption of slag former is by 1. slag and molten steel Proportionate relationship, 2. slag slag basicity (w (CaO)/w (SiO2)=2.5～3.0) determine, the amount of active lime is that slag former is total The 65～75% of quality, the amount of light dolomite is the 22～25% of slag former gross mass, and the amount of fluorite is slag former gross mass 0～5%.
In described step 2 (1), steel scrap is for sentencing steel scrap kind, shearing the high-quality steel scraps such as material.
In described step 2 (2), molten steel tapping temperature capping, to reduce LF stove intensification burden.
In described step 2 (2), tapping is in circular jet；Use slag retaining cone or skimming ball pushing off the slag during tapping, forbid slag of tapping.
In described step 2 (3), the addition operation of manganese metal is: add 1/3～2/3 times of actual metal manganese matter in tapping forward direction ladle Amount, adds surplus manganese metal in tapping process.
In described step 3 (1), the amount of winding-up argon is 550～800L/min.
In described step 3 (1), aluminum is to add with 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 weight/mass percentage composition thereof be: CaO:50～55%, SiO2: 5～8%, Al2O3: 25～32%, MgO:6～8%, CaF2: 1～3%, refining slag agent addition is molten steel total amount 0.8～1.2%.
In described step 4, application of vacuum is VD application of vacuum or RH application of vacuum.
In described step 4, vacuum treated time≤25min.
In described step 5 (2), if liquid steel temperature is less than 1523 DEG C, then returns in the ladle of step 3 (1) and be heated to 1543～1546 DEG C, then carry out step 5；Being because by the process of step 3 (1) to step 5 (2), the molten steel in ladle has temperature Fall；Returning step 3 (1) is the temperature in order to raise molten steel, so not carrying out 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 use superweak cold.
In described step 5 (4), billet, after two cold-zone coolings, quickly rolls off the production line, does not stops at roller-way, carry out stacking immediately Slow cooling.
The ocean platform potassium steel of the present invention and the preparation method of continuous casting steel billet thereof, by adjusting Mn/C ratio in steel, adjust steel Chemical composition, and then adjust steel strength and ductility product, obtain the yield strength of steel and the optimum of plasticity.By adjusting containing of Cu Amount improves the decay resistance of steel, improves the cryogenic property of steel by adjusting the content of Mn and Ni.
Accompanying drawing explanation
The ocean platform potassium steel continuous casting billet low power scanned photograph of Fig. 1 embodiment of the present invention 1 preparation.
Detailed description of the invention
Embodiment 1
A kind of ocean platform potassium steel, composition is the most as shown in table 1:
Table 1 high manganese offshore platform steel continuous casting billet composition (%)
The ocean platform preparation method of potassium steel continuous casting steel billet, flow process is: blast furnace-molten iron pretreatment-converter-LF refine-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, after desulfurization, slag is thoroughly scratched clean so that it is the mass percent containing composition is S≤0.0018%, Si:0.38%, P:0.070%；Blast-melted temperature be molten iron temperature be 1320 DEG C；Then by blast furnace ferrum Water pours ladle into；
Step 2, converter smelting:
(1) add high-quality steel scrap 14 tons to converter, then 86 tons blast-melted are poured in converter, point add 8t 2 times Slag former, including 5.6t active lime, 2t light dolomite and 400kg fluorite, addition is 5.6t for the first time, including 3.92t Active lime, 1.4t light dolomite and 280kg fluorite, then carry out oxygen blast process, when blowing is to carbon 1.6%, stop molten steel Only oxygen blast, adjusts converter angle and carries out deslagging, then add the slag former of 2.4t, and including 1.68t active lime, 0.6t is light-burned Dolomite and 120kg fluorite, melting 25min in converter, the mass percent making molten steel contain composition is: C≤0.035%, P≤0.008%, S≤0.006%；Wherein, the flow of oxygen is 400m3/ min, the time that oxygen blast processes is 12min；
(2) in ladle, add the amount of manganese metal in the theoretical potassium steel of 5.3 tons；The addition operation of manganese metal is: tapping forward direction steel Bag adds 3 tons of manganese metal quality, tapping process adds 2.3 tons of manganese metals；
(3) aluminum-manganese-iron alloy adding molten steel gross weight 380kg in tapping process in ladle carries out pre-deoxidation, and adds in ladle Entering ladle covering agent, its addition is the most exposed in atmosphere to ensure molten steel face；During converter tapping, molten steel tapping temperature is 1692 DEG C, The tapping time is 4min；
Step 3, LF refine:
(1) ladle starts Argon when entering LF station, and the amount of winding-up argon is 600L/min, adds 160kg low aluminum silicon ferrum, 520kg Low-carbon ferrochromium, 303kg electrolytic nickel, 71kg cathode copper and 300kg molybdenum-iron, be eventually adding 110kg aluminum steel section, 151kg low-carbon (LC) Ferrochrome and 10kg molybdenum-iron, carry out the fine setting of molten steel composition, and the composition making molten steel contain is C :≤0.07% by mass percentage, 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) after entering LF station, it is initially powered up heating and in ladle, adds pre-melted slag, after refining 57min, stopping winding-up argon, Liquid steel temperature is 1617 DEG C；Wherein, the composition of pre-melted slag and weight/mass percentage composition 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:
Molten steel in ladle carries out VD application of vacuum, and the vacuum treated time is 20min, makes ladle vacuum at 300Pa Above；
Step 5, finished product of casting:
(1) being toasted by continuous casting production, baking temperature is 1140 DEG C, and baking time is 3.5h；
(2) continuous casting production after making the molten steel in ladle flow into baking, controlling liquid steel temperature is 1526 DEG C；
(3) by the molten steel in continuous casting production, it is molded into the crystallizer being furnished with conventional water cooling plant, then adds in crystallizer Low-carbon micro steel-alloy covering slag, making slag blanket gross thickness is 41mm；
(4) going out billet from crystallizer, after two cold-zone coolings, the water distribution situation of two cold-zones is as shown in table 2, carries out stacking immediately Slow cooling；Wherein, billet pulls out from crystallizer, and automatically increasing the speed to pulling rate is 1.0m/min, then the operation of Cheng Heng pulling rate.
The ocean platform potassium steel of the present embodiment, its casting blank cross-section size is: 230mm × 1650mm, and its yield strength is 700MPa, the contraction percentage of area is 30%, and ballistic work (-60 DEG C) is 102J；The ocean platform of the present embodiment potassium steel continuous casting Base low-magnification report is as shown in table 3, and its corrosion resistance and weldability meet classification society's requirement to offshore platform steel.
The ocean platform potassium steel of the present embodiment, ocean platform potassium steel continuous casting billet low power scanned photograph prepared by the present embodiment As shown in Figure 1；
Table 2 Secondary Cooling Zone of Continuous Caster water distribution situation
Two cold-zone titles On-the-spot cooling circuit title On-the-spot minimum amount of water, m3/h
One district 1.1 23.0
2nd district 2 16.1
3rd district 3 18.0
4th district 4 8.8
5th district 5 14.0
6th district 6 7.3
7th district 7 3.2
Air cooling zone 8 0.4
NL 1.0 3.7
Total Water \ 94.5
Table 3 ocean platform potassium steel continuous casting billet low-magnification report
Embodiment 2
A kind of ocean platform potassium steel, composition is the most as shown in table 4:
Table 4 high manganese offshore platform steel continuous casting billet composition (%)
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 ocean platform preparation method of potassium steel continuous casting steel billet, flow process is: blast furnace-molten iron pretreatment-converter-LF refine-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 in torpedo tank car, after desulfurization, slag is thoroughly scratched clean so that it is the mass percent containing composition is S≤0.0018%, Si:0.35%, P:0.066%；Blast-melted temperature be molten iron temperature be 1330 DEG C；Then by blast furnace ferrum Water pours ladle into；
Step 2, converter smelting:
(1) add high-quality steel scrap 13 tons to converter, then 87 tons blast-melted are poured in converter, point add 8.2t 2 times Slag former, including 5.74t active lime, 2.1t light dolomite and 360kg fluorite, addition is 5.74t for the first time, including 4.02t active lime, 1.48t light dolomite and 240kg fluorite, then carry out oxygen blast process to molten steel, and blowing is to carbon 1.66% Time, stop oxygen blast, adjust converter angle and carry out deslagging, then add the slag former of 2.46t, including 1.72t active lime, 0.62t light dolomite and 120kg fluorite, melting 25min in converter, the mass percent making molten steel contain composition is: C≤0.033%, P≤0.008%, S≤0.006%；Wherein, the flow of oxygen is 420m3/ min, the time that oxygen blast processes is 11min；
(2) in ladle, add the amount of manganese metal in the theoretical potassium steel of 5.35 tons；The addition operation of manganese metal is: tapping forward direction Ladle adds 3.2 tons of manganese metal quality, tapping process adds 2.15 tons of manganese metals；
(3) aluminum-manganese-iron alloy adding molten steel gross weight 380kg in tapping process in ladle carries out pre-deoxidation, and adds in ladle Entering ladle covering agent, its addition is the most exposed in atmosphere to ensure molten steel face；During converter tapping, molten steel tapping temperature is 1689 DEG C, The tapping time is 3.5min；
Step 3, LF refine:
(1) ladle starts Argon when entering LF station, and the amount of winding-up argon is 650L/min, adds 161kg low aluminum silicon ferrum, 521kg Low-carbon ferrochromium, 303kg electrolytic nickel, 71kg cathode copper and 300kg molybdenum-iron, be eventually adding 112kg aluminum steel section, 151kg low-carbon (LC) Ferrochrome and 10kg molybdenum-iron, carry out the fine setting of molten steel composition, and the composition making molten steel contain is C :≤0.07% by mass percentage, 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) after entering LF station, it is initially powered up heating and in ladle, adds pre-melted slag, after refining 55min, stopping winding-up argon, Liquid steel temperature is 1620 DEG C；Wherein, the composition of pre-melted slag and weight/mass percentage composition 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:
Molten steel in ladle carries out VD application of vacuum, and the vacuum treated time is 22min, makes ladle vacuum at 305Pa；
Step 5, finished product of casting:
(1) being toasted by continuous casting production, baking temperature is 1145 DEG C, and baking time is 3.5h；
(2) continuous casting production after making the molten steel in ladle flow into baking, controlling liquid steel temperature is 1524 DEG C；
(3) by the molten steel in continuous casting production, it is molded into the crystallizer being furnished with conventional water cooling plant, then adds in crystallizer Low-carbon micro steel-alloy covering slag, making slag blanket gross thickness is 40mm；
(4) going out billet from crystallizer, after two cold-zone coolings, the water distribution situation of two cold-zones is as shown in table 2, carries out stacking immediately Slow cooling；Wherein, billet pulls out from crystallizer, and automatically increasing the speed to pulling rate is 1.0m/min, then the operation of Cheng Heng pulling rate.
The ocean platform potassium steel of the present embodiment, its casting blank cross-section size is: 230mm × 1650mm, and its yield strength is 705MPa, the contraction percentage of area is 30.1%, and ballistic work (-60 DEG C) is 105J.

Claims (10)

1. an ocean platform potassium steel, it is characterised in that described potassium steel 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.
Ocean platform potassium steel the most according to claim 1, it is characterised in that described potassium steel composition presses percent mass Ratio is: 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.
Ocean platform potassium steel the most according to claim 1, it is characterised in that the yield strength of described potassium steel >=690MPa, the contraction percentage of area >=20%, ballistic work (-40 DEG C) >=80J.The ocean platform potassium steel of the present invention, it is anticorrosive Performance and weldability meet classification society's requirement to offshore platform steel.
4. the preparation method of potassium steel continuous casting steel billet of the ocean platform described in claim 1, it is characterised in that specifically include with Lower step:
Step 1, blast-melted pretreatment:
By blast-melted pretreatment so that it is the mass percent containing composition is S≤0.004%, Si:0.20～0.50%, P≤0.090%； Blast-melted temperature is molten iron temperature >=1300 DEG C；
Step 2, converter smelting:
(1) add steel scrap to converter, then pour in converter by blast-melted, point 2 addition slag formers, add for the first time and makes After slag agent, converter is carried out oxygen blast process, add surplus slag former, melting 25～30min in converter, make molten steel contain into The mass percent divided is: 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 It is 380～440m3/ min, the time that oxygen blast processes is 10～15min；
(2) in ladle, add the amount of manganese metal in the theoretical potassium steel of 1.05～1.2 times；
(3) tapping process adds in ladle molten steel gross weight 0.35～0.40% aluminum-manganese-iron alloy carry out pre-deoxidation, and to ladle Middle addition ladle covering agent, its addition is the most exposed in atmosphere to ensure molten steel face；During converter tapping, molten steel tapping temperature is 1675～1695 DEG C, the tapping time is 3.5～5min；
Step 3, LF refine:
(1) ladle starts Argon when entering LF station, adds W metal, Mo and Cu, is eventually adding aluminum, ferrochrome and molybdenum Ferroalloy carries out the fine setting of molten steel composition, and the composition making molten steel contain is C :≤0.07%, Si:0.15～0.25% by mass percentage, 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) after entering LF station, it is initially powered up heating and in ladle, adds refining slag agent, after refining 50～60min, stopping winding-up Argon, liquid steel temperature is 1610～1620 DEG C；
Step 4, application of vacuum:
Molten steel in ladle is carried out application of vacuum, makes ladle vacuum at more than 300Pa；
Step 5, finished product of casting:
(1) being toasted by continuous casting production, baking temperature is 1100～1200 DEG C, baking time >=3h；
(2) continuous casting production after making the molten steel in ladle flow into baking, controlling liquid steel temperature is 1523～1526 DEG C；If molten steel Temperature is less than 1523 DEG C, then return in the ladle of step 3 (1) and be heated to 1543～1546 DEG C, then carry out step 5；If molten steel Temperature is higher than 1526 DEG C, then, in continuous casting production, be naturally cooling to 1523～1526 DEG C；
(3) by the molten steel in continuous casting production, it is molded into crystallizer, in crystallizer, then adds covering slag, make slag blanket total thickness Degree is 40 ± 5mm；
(4) go out billet from crystallizer, after two cold-zone coolings, carry out stacking slow cooling immediately.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described In step 2 (1), slag former is active lime, light dolomite and fluorite.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described In step 2 (1), slag former divides 2 additions, and addition is the 65～75% of slag former gross mass for the first time, and blowing is to carbon 1.6～2.0% Time, the slagging of falling stove, second time adds surplus, continues blowing；The consumption of slag former by the proportionate relationship of 1. slag and molten steel, 2. slag slag basicity (w (CaO)/w (SiO2)=2.5～3.0) determine, the amount of active lime is the 65～75% of slag former gross mass, The amount of light dolomite is the 22～25% of slag former gross mass, and the amount of fluorite is slag former gross mass 0～5%.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described In step 2 (3), the addition operation of manganese metal is: adds 1/3～2/3 times of actual metal manganese quality in tapping forward direction ladle, tapped Journey adds surplus manganese metal.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described In step 3 (1), the amount of winding-up argon is 550～800L/min.
In described step 3 (1), aluminum is to add with carbon-free aluminum steel form, and ferrochrome and molybdenum-iron are low-carbon alloy.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described In step 3 (2), refining slag agent is pre-melted slag, and its composition and weight/mass percentage composition thereof be: CaO:50～55%, SiO2: 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.
The preparation method of ocean platform potassium steel continuous casting steel billet the most according to claim 4, it is characterised in that described Step 4 in, application of vacuum is DV application of vacuum or RH application of vacuum.
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CN109487178A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 High-purity ultra-high manganese steel and its preparation process
CN109750210A (en) * 2018-12-29 2019-05-14 广西长城机械股份有限公司 The production method of hypoxemia, hydrogen content potassium steel
CN109957731A (en) * 2017-12-14 2019-07-02 鞍钢股份有限公司 A kind of ocean engineering high manganese medium plate and its production method
CN110724792A (en) * 2019-09-30 2020-01-24 河钢股份有限公司 Smelting method for producing high manganese steel for low-temperature environment by using LF refining furnace
CN112813351A (en) * 2021-01-06 2021-05-18 鞍钢股份有限公司 High manganese steel and smelting method thereof
CN112853026A (en) * 2021-01-06 2021-05-28 鞍钢股份有限公司 Manganese alloying method for smelting high manganese steel by converter
CN113927025A (en) * 2021-09-15 2022-01-14 东北大学 Chromium ladle drainage sand for high-manganese high-aluminum steel and preparation and use methods thereof
CN115323251A (en) * 2022-08-24 2022-11-11 东北大学 Super-thick, high-strength, high-toughness and high-homogeneity super-thick steel plate for hydropower and manufacturing method thereof

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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

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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

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CN109112418A (en) * 2017-06-26 2019-01-01 鞍钢股份有限公司 A kind of continuous cast method of potassium steel
CN109957731A (en) * 2017-12-14 2019-07-02 鞍钢股份有限公司 A kind of ocean engineering high manganese medium plate and its production method
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
CN109487178A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 High-purity ultra-high manganese steel and its preparation process
CN109750210A (en) * 2018-12-29 2019-05-14 广西长城机械股份有限公司 The production method of hypoxemia, hydrogen content potassium steel
CN110724792A (en) * 2019-09-30 2020-01-24 河钢股份有限公司 Smelting method for producing high manganese steel for low-temperature environment by using LF refining furnace
CN112813351A (en) * 2021-01-06 2021-05-18 鞍钢股份有限公司 High manganese steel and smelting method thereof
CN112853026A (en) * 2021-01-06 2021-05-28 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
CN113927025A (en) * 2021-09-15 2022-01-14 东北大学 Chromium ladle drainage sand for high-manganese high-aluminum steel and preparation and use methods thereof
CN115323251A (en) * 2022-08-24 2022-11-11 东北大学 Super-thick, high-strength, high-toughness and high-homogeneity super-thick steel plate for hydropower and manufacturing method thereof

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