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CN109628820A - A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method - Google Patents

A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method Download PDF

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Publication number
CN109628820A
CN109628820A CN201910023253.3A CN201910023253A CN109628820A CN 109628820 A CN109628820 A CN 109628820A CN 201910023253 A CN201910023253 A CN 201910023253A CN 109628820 A CN109628820 A CN 109628820A
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steel
low
grades
sulfur
pipe line
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马斌
宋平
魏巍
刘中凯
吴明翰
刘奇
刘欢
贾霖
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CERI YINGKOU EQUIPMENT DEVELOPMENT AND MANUFACTURING Co Ltd
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CERI YINGKOU EQUIPMENT DEVELOPMENT AND MANUFACTURING Co Ltd
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Publication of CN109628820A publication Critical patent/CN109628820A/en
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    • 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
    • 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
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

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  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production methods, the production method includes converter smelting, LF refining, VD vacuum processing, continuous casting working procedure.Present invention eliminates hot metal pretreatment technologies, reduce the consumption of passivated magnesium used in hot metal pretreatment technology, to reduce the consumption of non-renewable resources magnesium, with reaching the mesh for reducing production cost；The splash in Hot Metal Pretreatment is avoided simultaneously, it is ensured that production safety.Sulfur resistive pipe line steel continuous cast round billets specification of the present invention is 300~600mm of Φ；Product field trash type: A is carefully≤2.0 grades, A is slightly≤2.0 grades, B is carefully≤2.0 grades, B is slightly≤2.0 grades, C is carefully≤2.0 grades, C is slightly≤2.0 grades, and D is carefully≤2.0 grades, D is slightly≤2.0 grades, and A+B+C+D is slightly≤6.0 grades, A+B+C+D is carefully≤6.0 grades；DS grades≤2.0 grades.

Description

A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets productions Method.
Background technique
On steel pipe inner wall surface electrochemical corrosion reaction, H occur for acid-resistant pipeline steel2S is in steel -- at field trash interface void Form H2, H2Pressure increase causes crackle to generate, and booster serious accident is caused to occur.Seriously affect the safe handling of antiacid pipe.
To avoid pipe explosion accident from taking following countermeasure: (1) preventing hydrogen from invading and stablizing using addition Cu, Ni, Cr, W Corrosion product.(2) using reduces steel S, O content to reduce the amount of inclusions and size.(3) Calcium treatment is to sulphide inculsion in steel It is modified, controls inclusion morphology.
Each steel mill generallys use hot metal pretreatment technology smelting low-sulfur steel, and process flow is long, and transition relies on molten iron pretreatment, Increase process cost, while limiting the production sulfur resistive pipe line steel production of iron-free water pretreatment producer.
Therefore, a kind of production method of sulfur resistive pipe line steel is developed, process flow is shortened, reduces energy consumption, improves production efficiency, It is imperative to reduce production cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets producers Method.The invention can shorten process flow, reduce energy consumption, improve production efficiency, have important Social benefit and economic benefit.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel connects The production method of round billet is cast, the production method includes converter smelting, LF refining, VD vacuum processing, continuous casting working procedure, concrete technology It is described that steps are as follows:
The production method includes converter smelting, LF refining, VD vacuum processing, continuous casting working procedure, and specific process step is as described below:
(1) converter smelting process: molten iron P≤0.12%, S≤0.030% of converter is added in control；Steel-core-aluminium is added in tapping process 4.5~5.5 ㎏/t steel, 12~13 ㎏ of spiegeleisen/t steel, refining 5~6 ㎏ of lime/t steel, 6~7 ㎏ of pre-melted slag/t steel is added, Tap 4~8min of time, obtains half steel molten steel P≤0.011%；Control molten iron P, S content；It creates favorable conditions for de- P, de- S, Molten iron P, S content height is avoided to cause de- P, de- S difficult；
(2) LF refining process: refining 9~11 ㎏ of lime/t steel is added in refining in place, and ferrosilicon powder 2.0~4.0 is added in refining process 0.3~1.0 ㎏ of ㎏/t steel and aluminum shot/t steel is diffused deoxidation, obtains molten steel S≤0.002%, O≤40ppm；
(3) VD is vacuum-treated process: molten steel is vacuum-treated through VD, fed after VD is broken empty 0.4~0.5 ㎏ of titanium/t steel, feed aluminium 0.2~ After 0.4 ㎏/t steel, 3~8min of soft blow argon gas, open and pour furnace and feed pure calcium line by 0.2~0.4 ㎏/t steel, company pour furnace by 0.08~ 0.12 ㎏/t steel feeds pure calcium line, guarantees Ca/S > 1.5；
(4) continuous casting working procedure: molten steel obtains qualified low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets through continuous casting.
Refining lime in step (1) of the present invention, (2): CaO >=90%, activity degree >=300；It is created for desulfurization advantageous Condition guarantees that finished product S content is met the requirements.
Steel-core-aluminium in the step (1) of the present invention: 3.3~3.9g/cm of bulk density3, aluminium is containing aluminium >=98%；The step (1) pre-melted slag in: CaO:45~50%, Al2O3: 35~45%, MgO:3.0~8.0%.
Pure calcium line in step (3) of the present invention, Ca >=98%.
Step (1) converter smelting process of the present invention, after tapping, it is the 2~5% of converter capacity that steel amount is stayed in converter.
Step (4) continuous casting working procedure of the present invention, slab cutting head >=1.5m, back-end crop >=3m.
Sulfur resistive pipe line steel continuous cast round billets chemical component composition and its mass percentage of the present invention are as follows: C:0.11~ 0.14%, Si:0.15~0.35%, Mn:1.00~1.20%, P≤0.012%, S≤0.002%, TAl:0.015~0.035%, Cu: 0.10~0.20%, Ni:0.10~0.20%, Cr≤0.06%, Mo≤0.05%, V≤0.03%, Ti:0.015~0.030%, Nb: 0.01~0.03%, Ca:0.0015~0.0040%, surplus are Fe and inevitable impurity.
Sulfur resistive pipe line steel continuous cast round billets gas content of the present invention: O≤40ppm, N≤70ppm, H≤2ppm.
Sulfur resistive pipe line steel continuous cast round billets field trash type of the present invention: A is carefully≤2.0 grades, A is slightly≤2.0 grades, and B is thin ≤ 2.0 grades of system, B are slightly≤2.0 grades, and C is carefully≤2.0 grades, C is slightly≤2.0 grades, and D is carefully≤2.0 grades, D is slightly≤2.0 grades, A+ B+C+D is slightly≤6.0 grades, A+B+C+D is carefully≤6.0 grades；DS grades≤2.0 grades.
Sulfur resistive pipe line steel continuous cast round billets specification of the present invention is 300~600mm of Φ.
Mentality of designing of the present invention:
Ladle requires baking good, avoids the low increase refining heating task of ladle temperature, while can be rapidly heated as desulfurization creation Advantage, guarantee ladle without residual steel, residue, and steel ladle edge residue must thorough cleaning avoid residual steel, residue from polluting molten steel.
Steel scrap selects pig iron, and the small-sized scraps such as steel scrap hot wafering guarantee that scrap melting is good, while avoiding being added containing Cr Steel scrap causes finished product Cr content high.
Tapping hole has been blocked up after upper furnace tapping avoids slag early period from causing finished product P high, clears up fire door, furnace crown before converter tapping Bits prevent tapping process fire door, furnace crown oxidizing slag from entering ladle, can effectively avoid molten steel and increase P.Slag fluidity is controlled, Pushing off the slag work is carried out, emphasis prevents slag, stays 2~5t of steel, prevents the mixed punching of tapping later period steel slag from molten steel being caused to increase P.
4.5~5.5 ㎏ of steel-core-aluminium/t steel is added in tapping process, ensures that oxygen contains using stirring action good in tapping process Amount is sufficiently removed with steel core reactive aluminum, and 12~13 ㎏ of spiegeleisen/t steel, refining 5~6 ㎏ of lime/t steel, pre-melted slag 6~7 is added ㎏/t steel, reasonable charging sequence can guarantee that alloy, refining lime, pre-melted slag sufficiently melt, while reasonably refine lime, pre- Slag additional amount can guarantee that refining lime, pre-melted slag sufficiently melt, and smelts and creates favorable conditions for refining.
LF refining adds refining lime in place, guarantees the sufficient quantity of slag, reduces S content concn in slag, reduces S in molten steel and contains Amount, refining process are added 2.0~4.0 ㎏ of ferrosilicon powder/0.3~1.0 ㎏ of t steel and aluminum shot/t steel and are diffused deoxidation, can avoid carbon SiClx carburetting causes carbon content high, while can guarantee that deoxidation of molten steel is good.
The processing of VD backpack cover dry slag is clean, and high-sulfur dry slag drops to molten steel and causes molten steel S content height on avoidable bell.VD is broken 0.4~0.5 ㎏ of titanium/t steel is fed after sky, feeds 0.2~0.4 ㎏ of aluminium/t steel, after 3~8min of soft blow argon gas, is opened and is poured furnace by 0.2~0.4 ㎏/t steel feeds pure calcium line, and company pours furnace and feeds pure calcium line by 0.08~0.12 ㎏/t steel, guarantees that Ca/S is qualified.
Continuous casting calcic molten steel corrodes seriously stopper, causes stopper rod flow control difficult, by using the weight corroded with anticalcium Calcium stopper can guarantee good flow control ability, guarantees that casting liquid level is steady, liquid fluctuating is avoided to influence slab quality；Cutting head >= 1.5m, back-end crop >=3m, it is ensured that sufficiently cut away on surface and the undesirable slab of internal soundness, to obtain the casting of good quality Base.
Sulfur resistive pipe line steel continuous cast round billets canonical reference YB/T4149-2006 of the present invention；Macrostructure is loose and segregation is evaluated Canonical reference GB/T1979-2001；Field trash rating scale refers to GB/T10561-2005.
The beneficial effects of adopting the technical scheme are that 1, present invention eliminates hot metal pretreatment technologies, subtract Passivated magnesium consumption, to reduce the consumption of non-renewable resources magnesium, reaches reduction production cost used in few hot metal pretreatment technology Purpose；The splash in Hot Metal Pretreatment is avoided simultaneously, it is ensured that production safety.2, the present invention is because cancelling molten iron pretreatment Technique reaches about 20 yuan/t steel of the costs such as reduction personnel wage, supplementary product onsumption, equipment investment, plant maintenance, annual by production 15 Ten thousand tons of sulfur resistive pipe line steel continuous cast round billets calculate, and can reduce by 3,000,000 yuan/year of cost.3, sulfur resistive pipe line steel continuous cast round billets rule of the present invention Lattice are 300~600mm of Φ；Product field trash type: A is carefully≤2.0 grades, A is slightly≤2.0 grades, and B is carefully≤2.0 grades, B is slightly ≤ 2.0 grades, C is carefully≤2.0 grades, C is slightly≤2.0 grades, and D is carefully≤2.0 grades, D is slightly≤2.0 grades, and A+B+C+D is slightly≤6.0 Grade, A+B+C+D are carefully≤6.0 grades；DS grades≤2.0 grades.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 600mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.12%, S:0.016% of 100t converter smelting procedure: is added；5.5 ㎏ of steel-core-aluminium/t is added in tapping process 12.3 ㎏ of spiegeleisen/t steel, refining 5.5 ㎏ of lime/t steel, 6.7 ㎏ of pre-melted slag/t steel is added in steel；Tap time 6.5min, stays Steel 5t obtains half steel molten steel P:0.009%；
(2) LF refining process: refining add in place refining lime 9.8kg/t steel, refining process be added 3.6 ㎏ of ferrosilicon powder/t steel and 0.85 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0015%, O:10.2ppm；
(3) VD is vacuum-treated process: feeding 0.43 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.31 ㎏ of aluminium/t steel, after soft blow argon gas 3min, opens It pours furnace and feeds pure calcium line by 0.3 ㎏/t steel, guarantee that Ca/S ratio is 1.53；
(4) continuous casting working procedure: slab cuts off 1.5m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 2
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 600mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.103%, S:0.030% of 100t converter smelting procedure: is added；5.3 ㎏ of steel-core-aluminium/t is added in tapping process 12.6 ㎏ of spiegeleisen/t steel, refining 5.9 ㎏ of lime/t steel, 6.7 ㎏ of pre-melted slag/t steel is added in steel；Tap time 6min20s, Steel 2t is stayed, half steel molten steel P:0.006% is obtained；
(2) LF refining process: refining 10.6 ㎏ of lime/t steel is added in refining in place, and 3.8 ㎏ of ferrosilicon powder/t steel is added in refining process It is diffused deoxidation with 0.86 ㎏ of aluminum shot/t steel, obtains molten steel S:0.0013%, O:10.6ppm；
(3) VD is vacuum-treated process: feeding 0.49 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.36 ㎏ of aluminium/t steel, after soft blow argon gas 3min, even It pours furnace and feeds pure calcium line by 0.11 ㎏/t steel, guarantee that Ca/S ratio is 2.00；
(4) continuous casting working procedure: slab back-end crop 3.2m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 3
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 600mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.097%, S:0.027% of 100t converter smelting procedure: is added；5.5 ㎏ of steel-core-aluminium/t is added in tapping process 12.9 ㎏ of spiegeleisen/t steel, refining 5.8 ㎏ of lime/t steel, 6.8 ㎏ of pre-melted slag/t steel is added in steel；Tap time 6min10s, Steel 4t is stayed, half steel molten steel P:0.007% is obtained；
(2) LF refining process: refining add in place refining 11 ㎏ of lime/t steel, refining process be added 3.9 ㎏ of ferrosilicon powder/t steel and 0.87 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0012%, O:9.8ppm；
(3) VD is vacuum-treated process: feeding 0.5 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.39 ㎏ of aluminium/t steel, after soft blow argon gas 7min, even It pours furnace and feeds pure calcium line by 0.1 ㎏/t steel, guarantee that Ca/S ratio is 1.92；
(4) continuous casting working procedure: slab cuts off 1.52m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 4
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 600mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.103%, S:0.025% of 100t converter smelting procedure: is added；5.5 ㎏ of steel-core-aluminium/t is added in tapping process 12.1 ㎏ of spiegeleisen/t steel, refining 5.1 ㎏ of lime/t steel, 6.2 ㎏ of pre-melted slag/t steel is added in steel；Tap time 6min5s, stays Steel 3t obtains half steel molten steel P:0.006%；
(2) LF refining process: refining add in place refining 9.3 ㎏ of lime/t steel, refining process be added 3.7 ㎏ of ferrosilicon powder/t steel and 0.87 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0013%, O:10.4ppm；
(3) VD is vacuum-treated process: feeding 0.41 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.26 ㎏ of aluminium/t steel, after soft blow argon gas 8min, even It pours furnace and feeds pure calcium line by 0.091 ㎏/t steel, guarantee that Ca/S ratio is 1.92；
(4) continuous casting working procedure: slab cuts off 1.58m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 5
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 600mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.102%, S:0.022% of 100t converter smelting procedure: is added；4.6 ㎏ of steel-core-aluminium/t is added in tapping process 12.3 ㎏ of spiegeleisen/t steel, refining 5.2 ㎏ of lime/t steel, 6.2 ㎏ of pre-melted slag/t steel is added in steel；Tap time 6min20s, Steel 2.5t is stayed, half steel molten steel P:0.007% is obtained；
(2) LF refining process: refining add in place refining 9.2 ㎏ of lime/t steel, refining process be added 3.9 ㎏ of ferrosilicon powder/t steel and 0.89 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0012%, O:10.8ppm；
(3) VD is vacuum-treated process: feeding 0.41 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.23 ㎏ of aluminium/t steel, after soft blow argon gas 5min, even It pours furnace and feeds pure calcium line by 0.093 ㎏/t steel, guarantee that Ca/S ratio is 1.58；
(4) continuous casting working procedure: slab back-end crop 3.1m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 6
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 300mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.100%, S:0.020% of 100t converter smelting procedure: is added；5.3 ㎏ of steel-core-aluminium/t is added in tapping process 12.1 ㎏ of spiegeleisen/t steel, refining 5.2 ㎏ of lime/t steel, 6.2 ㎏ of pre-melted slag/t steel is added in steel；Tap time 4.5min, stays Steel 3.5t obtains half steel molten steel P:0.011%；
(2) LF refining process: refining add in place refining 9.5 ㎏ of lime/t steel, refining process be added 2.0 ㎏ of ferrosilicon powder/t steel and 1.0 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0020%, O:7.9ppm；
(3) VD is vacuum-treated process: feeding 0.41 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.21 ㎏ of aluminium/t steel, after soft blow argon gas 5min, opens It pours furnace and feeds pure calcium line by 0.40 ㎏/t steel, guarantee that Ca/S ratio is 2；
(4) continuous casting working procedure: slab cuts off 1.7m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 7
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 400mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.075%, S:0.015% of 100t converter smelting procedure: is added；4.9 ㎏ of steel-core-aluminium/t is added in tapping process 12.3 ㎏ of spiegeleisen/t steel, refining 5.3 ㎏ of lime/t steel, 6.1 ㎏ of pre-melted slag/t steel is added in steel；Tap time 4.5min, stays Steel 4.5t obtains half steel molten steel P:0.008%；
(2) LF refining process: refining add in place refining 9.0 ㎏ of lime/t steel, refining process be added 4.0 ㎏ of ferrosilicon powder/t steel and 0.3 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0013%, O:7.5ppm；
(3) VD is vacuum-treated process: feeding 0.4 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.2 ㎏ of aluminium/t steel, after soft blow argon gas 8min, opens and pour Furnace feeds pure calcium line by 0.20 ㎏/t steel, guarantees that Ca/S ratio is 2.15；
(4) continuous casting working procedure: slab back-end crop 3.0m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 8
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 300mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.083%, S:0.019% of 100t converter smelting procedure: is added；5.5 ㎏ of steel-core-aluminium/t is added in tapping process 13 ㎏ of spiegeleisen/t steel, refining 6 ㎏ of lime/t steel, 7 ㎏ of pre-melted slag/t steel is added in steel；Tap time 4min20s, stays steel 3t, Obtain half steel molten steel P:0.007%；
(2) LF refining process: refining add in place refining 11 ㎏ of lime/t steel, refining process be added 2.8 ㎏ of ferrosilicon powder/t steel and 0.56 ㎏ of aluminum shot/t steel is diffused deoxidation, obtains molten steel S:0.0007%, O:6.4ppm；
(3) VD is vacuum-treated process: feeding 0.48 ㎏ of titanium/t steel after the broken sky of VD, feeds 0.37 ㎏ of aluminium/t steel, after soft blow argon gas 6min, even It pours furnace and feeds pure calcium line by 0.12 ㎏/t steel, guarantee that Ca/S ratio is 1.87；
(4) continuous casting working procedure: slab cuts off 1.65m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
Embodiment 9
The present embodiment sulfur resistive pipe line steel continuous cast round billets steel grade is L245NCS, and specification is Φ 500mm, chemical component composition and matter Amount percentage composition is shown in Table 1, and gas content is shown in Table 2.
The production method of the present embodiment sulfur resistive pipe line steel continuous cast round billets includes converter smelting, LF refining, VD vacuum processing, connects Foundry work sequence, specific process step are as described below:
(1) molten iron P:0.069%, S:0.012% of 100t converter smelting procedure: is added；4.5 ㎏ of steel-core-aluminium/t is added in tapping process 12.0 ㎏ of spiegeleisen/t steel, refining 5.0 ㎏ of lime/t steel, 6.0 ㎏ of pre-melted slag/t steel is added in steel；Tap time 4.0min, stays Steel 4.2t obtains half steel molten steel P:0.006%；
(2) LF refining process: refining 9 ㎏ of lime/t steel is added in refining in place, and 2.3 ㎏ of ferrosilicon powder/t steel and aluminium is added in refining process Grain 0.73 ㎏/t steel is diffused deoxidation, obtains molten steel S:0.0011%, O:9.5ppm；
(3) VD feeds 0.44 ㎏ of titanium/t steel after being vacuum-treated the broken sky of process VD, feeds 0.40 ㎏ of aluminium/t steel, after soft blow argon gas 6min, even It pours furnace and feeds pure calcium line by 0.08 ㎏/t steel, guarantee that Ca/S ratio is 1.53；
(4) continuous casting working procedure: slab back-end crop 3.5m.
The present embodiment sulfur resistive pipe line steel continuous cast round billets field trash type cases are shown in Table 3；Field trash detection case is shown in Table 4.
1 embodiment 1-9 sulfur resistive pipe line steel continuous cast round billets chemical component of table composition and mass percentage (%)
Ingredient surplus is Fe and inevitable impurity in table 1.Ca:0.0015~0.0040%
2 embodiment 1-9 sulfur resistive pipe line steel continuous cast round billets gas content (ppm) of table
3 embodiment 1-9 sulfur resistive pipe line steel continuous cast round billets macrostructure of table is loose and segregation is evaluated
4 embodiment 1-9 sulfur resistive pipe line steel continuous cast round billets field trash detection case of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention It asks in range.

Claims (10)

1. a kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production methods, which is characterized in that the production method includes turning Furnace smelting, LF refining, VD vacuum processing, continuous casting working procedure, specific process step are as described below:
(1) converter smelting process: molten iron P≤0.12%, S≤0.030% of converter is added in control；Steel-core-aluminium is added in tapping process 4.5~5.5 ㎏/t steel, 12~13 ㎏ of spiegeleisen/t steel, refining 5~6 ㎏ of lime/t steel, 6~7 ㎏ of pre-melted slag/t steel is added, Tap 4~8min of time, obtains half steel molten steel P≤0.011%；
(2) LF refining process: refining 9~11 ㎏ of lime/t steel is added in refining in place, and ferrosilicon powder 2.0~4.0 is added in refining process 0.3~1.0 ㎏ of ㎏/t steel and aluminum shot/t steel is diffused deoxidation, obtains molten steel S≤0.002%, O≤40ppm；
(3) VD is vacuum-treated process: molten steel is vacuum-treated through VD, fed after VD is broken empty 0.4~0.5 ㎏ of titanium/t steel, feed aluminium 0.2~ After 0.4 ㎏/t steel, 3~8min of soft blow argon gas, open and pour furnace and feed pure calcium line by 0.2~0.4 ㎏/t steel, company pour furnace by 0.08~ 0.12 ㎏/t steel feeds pure calcium line, guarantees Ca/S > 1.5；
(4) continuous casting working procedure: molten steel obtains qualified low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets through continuous casting.
2. one kind according to claim 1 is low-phosphorous, the production method of low-sulfur sulfur resistive pipe line steel continuous cast round billets, feature exists In refining lime in the step (1), (2): CaO >=90%, activity degree >=300.
3. one kind according to claim 1 is low-phosphorous, the production method of low-sulfur sulfur resistive pipe line steel, which is characterized in that the step Suddenly the steel-core-aluminium in (1): 3.3~3.9g/cm of bulk density3, aluminium is containing aluminium >=98%；Pre-melted slag in the step (1): CaO:45 ~50%, Al2O3: 35~45%, MgO:3.0~8.0%.
4. one kind according to claim 1 is low-phosphorous, the production method of low-sulfur sulfur resistive pipe line steel continuous cast round billets, feature exists In, pure calcium line in the step (3), Ca >=98%.
5. one kind according to claim 1 is low-phosphorous, the production method of low-sulfur sulfur resistive pipe line steel continuous cast round billets, feature exists In step (1) the converter smelting process, after tapping, it is the 2~5% of converter capacity that steel amount is stayed in converter.
6. one kind according to claim 1 is low-phosphorous, the production method of low-sulfur sulfur resistive pipe line steel continuous cast round billets, feature exists In, step (4) continuous casting working procedure, slab cutting head >=1.5m, back-end crop >=3m.
7. one kind described in -6 any one is low-phosphorous according to claim 1, production methods of low-sulfur sulfur resistive pipe line steel continuous cast round billets, It is characterized in that, the sulfur resistive pipe line steel continuous cast round billets chemical component composition and its mass percentage are as follows: C:0.11~ 0.14%, Si:0.15~0.35%, Mn:1.00~1.20%, P≤0.012%, S≤0.002%, TAl:0.015~0.035%, Cu: 0.10~0.20%, Ni:0.10~0.20%, Cr≤0.06%, Mo≤0.05%, V≤0.03%, Ti:0.015~0.030%, Nb: 0.01~0.03%, Ca:0.0015~0.0040%, surplus are Fe and inevitable impurity.
8. one kind described in -6 any one is low-phosphorous according to claim 1, production methods of low-sulfur sulfur resistive pipe line steel continuous cast round billets, It is characterized in that, the sulfur resistive pipe line steel continuous cast round billets gas content: O≤40ppm, N≤70ppm, H≤2ppm.
9. one kind described in -6 any one is low-phosphorous according to claim 1, production methods of low-sulfur sulfur resistive pipe line steel continuous cast round billets, It is characterized in that, the sulfur resistive pipe line steel continuous cast round billets field trash type: A is carefully≤2.0 grades, A is slightly≤2.0 grades, B is carefully≤ 2.0 grades, B be slightly≤2.0 grades, C is carefully≤2.0 grades, C is slightly≤2.0 grades, and D is carefully≤2.0 grades, D is slightly≤2.0 grades, A+B+C+ D is slightly≤6.0 grades, A+B+C+D is carefully≤6.0 grades；DS grades≤2.0 grades.
10. one kind described in -6 any one is low-phosphorous according to claim 1, production method of low-sulfur sulfur resistive pipe line steel, feature It is, the sulfur resistive pipe line steel continuous cast round billets specification is 300~600mm of Φ.
CN201910023253.3A 2019-01-10 2019-01-10 A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method Withdrawn CN109628820A (en)

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