CN108531807A - A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process - Google Patents

A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process Download PDF

Info

Publication number
CN108531807A
CN108531807A CN201810344280.6A CN201810344280A CN108531807A CN 108531807 A CN108531807 A CN 108531807A CN 201810344280 A CN201810344280 A CN 201810344280A CN 108531807 A CN108531807 A CN 108531807A
Authority
CN
China
Prior art keywords
steel
calcium
desulfurization
heavy caliber
heavy
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.)
Granted
Application number
CN201810344280.6A
Other languages
Chinese (zh)
Other versions
CN108531807B (en
Inventor
翟冬雨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Iron and Steel Co Ltd
Original Assignee
Nanjing Iron and Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanjing Iron and Steel Co Ltd filed Critical Nanjing Iron and Steel Co Ltd
Priority to CN201810344280.6A priority Critical patent/CN108531807B/en
Publication of CN108531807A publication Critical patent/CN108531807A/en
Application granted granted Critical
Publication of CN108531807B publication Critical patent/CN108531807B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—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
    • C22C38/002—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
    • C22C38/06—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
    • C22C38/48—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
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a kind of heavy wall heavy caliber X80M pipelines clean steel and smelting processes, are related to metallurgical technology field, and chemical composition and mass percent are as follows：C：0.04%~0.06%, Si：0.10%~0.30%, Mn：1.70%~1.80%, P≤0.013%, S：0.0010%, Nb：0.060%~0.070%, Ti：0.006%~0.020%, Ni：0.20%~0.30%, Cr：0.10%~0.20%, Cu：0.10%~0.30%, Mo：0.10%~0.20%, Al：0.015%~0.050%, Ca：0.0005%~0.0040%, surplus is Fe and impurity.The present invention by change inclusion morphology, promote field trash it is quiet stir, it is calm during floating mechanism start with, provide a kind of production technology effectively improving big wall thickness pipe line steel cleaning steel smelting, 1.5 grades of field trash qualification rates stabilizations are increased to 99% or more.

Description

A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process
Technical field
The present invention relates to metallurgical technology fields, more particularly to a kind of heavy wall heavy caliber X80M pipelines clean steel and smelting side Method.
Background technology
The high grade pipe line steel X80M that the Sino-Russian eastern line of petrochina, the new feed channel project of sinopec use at present is pure to molten steel Degree require it is extremely stringent, field trash require A, B, C, D class be 1.5 grades, product requirement wall thickness 30.8mm or more, plate wide 3700 with On, blank 300mm or more, width 2500mm or more are needed, there was only 88% left side using existing production technology field trash qualification rate It is right.
Invention content
The present invention in view of the above technical problems, the shortcomings that overcoming the prior art, provides a kind of heavy wall heavy caliber X80M pipelines Clean steel smelting process, 1.5 grades of field trash qualification rates, which are stablized, to be improved to 99% or more.
In order to solve the above technical problems, the present invention provides a kind of heavy wall heavy caliber X80M pipeline clean steels, chemistry at Divide and mass percent is as follows：C：0.04%~0.06%, Si：0.10%~0.30%, Mn：1.70%~1.80%, P≤ 0.013%, S：0.0010%, Nb：0.060%~0.070%, Ti：0.006%~0.020%, Ni：0.20%~0.30%, Cr：0.10%~0.20%, Cu：0.10%~0.30%, Mo：0.10%~0.20%, Al：0.015%~0.050%, Ca： 0.0005%~0.0040%, surplus is Fe and impurity.
It is clean applied to heavy wall heavy caliber X80M pipelines described in claim 1 that another object of the present invention is to provide one kind Net steel smelting method, includes the following steps：
S1, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim after desulfurization clean, enter S≤0.0020% in stove molten iron, S≤0.0010% after converter；
S2, steel-making use the process route of BOF → LF stoves refining → RH refinings → continuous casting；Tapping Temperature of Bof 1660 DEG C~1680 ℃；Converter tapping carries out slag making using pro-molten refining slag+active lime；
S3, molten steel carry out heating slugging, heating slugging process argon bottom-blowing flow 300Nl/min~500Nl/ after reaching LF stoves min；It is properly added aluminium wire according to clinker situation, desulfurization operations, lime adding amount 1Kg/t, aluminium are carried out after reaching white slag and submerged arc Silk 0.1Kg/t, argon bottom-blowing flow 250Nl/min~350Nl/min feed aluminum steel and adjust molten steel aluminium content, during hello aluminum steel Control argon flow amount 20Nl/min~30Nl/min；Alloying, heating 6~8min samplings point are carried out according to the ingredient of target steel grade Analysis, lower electrode continue the desulfurization that heats up；Sulfur content is stablized within 0.0010% after LF alloyings；
S4, RH meet vacuum cycle 15min~20min under vacuum degree≤3mbar, and Calcium treatment, calcium are carried out after vacuum processing Processing uses seamless calcium line, and calcium line treating capacity 150m~180m, calcium content is 0.0015%~0.0025% after processing, Calcium treatment After quiet stir 20min；
S5, CCM cast are poured into a mould using full guard, are closed and are guaranteed replacement according to the big packet of big packet surplus setting 5t or less progress, middle packet overheats Degree meets 35 DEG C~40 DEG C.
The technical solution that the present invention further limits is：
Further, in step S3, aluminum steel feed quantity is maintained at 0.04%~0.05% model with aluminium content in smelting process molten steel It encloses to control.
Preceding a kind of heavy wall heavy caliber X80M pipeline clean steel smelting processes, in step S4, after vacuum processing starts Forbid to carry out alloying operation to molten steel again, forbids to add deoxidier.
A kind of preceding heavy wall heavy caliber X80M pipeline clean steel smelting processes, in step S5, middle covering agent uses Liquid coverture, liquid coverture chemical composition and mass percent are as follows：CaO：20.0%~30.0%, MgO：10.0%~ 30.0%, Al2O3:15.0%~25.0%, SiO2:≤ 8.0%, CGu：≤ 1.0%, F：≤ 0.50%, R:4.0%~6.0%, H2O:≤ 0.5%, surplus is impurity.
The beneficial effects of the invention are as follows：
(1) present invention proposes a kind of special composition design and Calcium treatment technique, and CaS-CaO solid-states are obtained after RH Calcium treatments Field trash, contact angle of the solid inclusions in molten steel are much larger than liquid inclusions with surface tension, and solid inclusions are in molten steel In be more advantageous to agglomeration floating；
(2) LF after treatments obtain the molten steel composition of S≤0.0010% in the present invention, and obtaining calcium content after RH application of vacuum exists 0.0015%~0.0025% molten steel, it is CaS-CaO solid inclusions that can promote the denaturation of molten steel inclusion；
(3) it is precondition that solid inclusions are obtained in the present invention, and it is good that field trash agglomeration floating needs molten steel to have Dynamics, thermodynamic condition, the cast of the high degree of superheat effectively increase in ladle molten steel and stir, allocate and transport, the heat in casting process quiet Mechanical condition, it is quiet stir during argon gas is blown into, MOLTEN STEEL FLOW both provides dynamic conditions, power appropriate in casting process It learns, thermodynamic condition has promoted to obtain effective agglomeration and removal of floating in solid inclusions in molten steel；
(4) degree of superheat is not only suitble to pouring molten steel, the thermodynamic condition of molten steel complete within the scope of 35 DEG C~40 DEG C in the present invention Meet the agglomeration of field trash and removal of floating, improves Molten Steel Cleanliness, improve molten steel internal soundness；
(5) converter addition slag charge is conducive to clinker fritting in the present invention, shortens LF and makes the white slag time, mitigates LF desulfurization pressure；
(6) sulfur content is stablized within 0.0010% after LF alloyings in the present invention, to obtain stable CaS- after RH Calcium treatments CaO solid inclusions provide precondition；
(7) the big packet pass of packet surplus setting 5t or less progress greatly is guaranteed replacement in the present invention, it is ensured that middle packet is without slag cast, middle covering agent Using novel liquid coverture, this kind of coverture composition is more preferable to field trash suction-operated closer to RH slag compositions, it is ensured that in Effective absorption of the covering agent to field trash.
Specific implementation mode
Embodiment 1
A kind of heavy wall heavy caliber X80M pipeline clean steel smelting processes provided in this embodiment, include the following steps：
S1, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim after desulfurization clean, enter S≤0.0020% in stove molten iron, S≤0.0010% after converter；
S2, steel-making use the process route of BOF → LF stoves refining → RH refinings → continuous casting；Tapping Temperature of Bof 1660 DEG C~1680 ℃；Converter tapping carries out slag making using pro-molten refining slag+active lime；
S3, molten steel carry out heating slugging, heating slugging process argon bottom-blowing flow 300Nl/min~500Nl/ after reaching LF stoves min；It is properly added aluminium wire according to clinker situation, desulfurization operations, lime adding amount 1Kg/t, aluminium are carried out after reaching white slag and submerged arc Silk 0.1Kg/t, argon bottom-blowing flow 250Nl/min~350Nl/min, feed aluminum steel adjust molten steel aluminium content, aluminum steel feed quantity with Aluminium content is maintained at 0.04%~0.05% range to control in smelting process molten steel, feeds aluminum steel and controls argon flow amount in the process 20Nl/min~30Nl/min；According to the ingredient of target steel grade carry out alloying, heat up 6~8min sampling analyses, lower electrode after Temperature desulfurization of continuing rising；Sulfur content is stablized within 0.0010% after LF alloyings；
S4, RH meet vacuum cycle 15min~20min under vacuum degree≤3mbar, vacuum processing forbid after starting again to molten steel into Row alloying operates, and forbids to add deoxidier；Calcium treatment is carried out after vacuum processing, Calcium treatment uses seamless calcium line, calcium line Treating capacity 150m~180m, calcium content is quiet after 0.0015%~0.0025%, Calcium treatment after processing stirs 20min；
S5, CCM cast are poured into a mould using full guard, are closed and are guaranteed replacement according to the big packet of big packet surplus setting 5t or less progress, middle cladding is covered Agent uses liquid coverture, and liquid coverture chemical composition and mass percent are as follows：CaO：20.0%~30.0%, MgO： 10.0%~30.0%, Al2O3:15.0%~25.0%, SiO2:≤ 8.0%, CGu：≤ 1.0%, F：≤ 0.50%, R:4.0% ~6.0%, H2O:≤ 0.5%, surplus is impurity；The middle packet degree of superheat meets 35 DEG C~40 DEG C.
2~embodiment of embodiment 6
A kind of heavy wall heavy caliber X80M pipeline clean steels that 2~embodiment of embodiment 6 provides, with production described in embodiment 1 Method produces, and chemical composition and mass percent are as shown in table 1, and state modulator is as shown in table 2, testing inspection result such as 3 institute of table Show：
Table 1
Table 2
Heat (batch) number Vacuum degree Vacuum time Calcium treatment It is quiet to stir the time Big packet Yu Gangliang The degree of superheat
Embodiment 1 2mbar 20min 180m 20min 3t 39℃
Embodiment 2 2mbar 20min 160m 20min 2t 37℃
Embodiment 3 2mbar 20min 160m 20min 3t 36℃
Embodiment 4 2mbar 20min 160m 20min 2t 35℃
Embodiment 5 2mbar 18min 160m 20min 3t 38℃
Table 3
Steel grade Amount of inspection/ 1.5 grades of qualified quantity/ 1.5 grades of qualification rates (%)
Embodiment 1 X80M 9 9 100.0
Embodiment 2 X80M 9 9 100.0
Embodiment 3 X80M 8 8 100.00
Embodiment 4 X80M 8 8 100.00
Embodiment 5 X80M 9 9 100.00
A kind of LF stoves after treatment of present invention design obtains sulfur content and is not more than 0.0010%, and obtaining calcium after RH application of vacuum contains The molten steel between 0.0015%~0.0025% is measured, steel-making uses the technique road of BOF → LF stoves refining → RH refinings → continuous casting Line；Aluminium deoxidier is added during converter tapping, LF refining and carries out deoxidation alloying, molten steel send to RH and is vacuum-treated, Degassing is carried out to go to be mingled with；It is designed by unique composition, obtains uniformly tiny CaS-CaO solid-oxides, continuous casting was cast It is poured into a mould using the high degree of superheat in journey, achievees the purpose that molten steel calmness, field trash are fully floated, effectively promote Cleanliness of Molten Steel, lead to Cross change inclusion morphology, promote field trash it is quiet stir, it is calm during floating mechanism, to obtain cleaner X80M grades The smelting process of pipe line steel.
This method simply and readily operates, with obvious effects, is conducive to large-scale industrial production, 1.5 grades of field trash qualification rates Stabilization is increased to 99% or more, meets the needs of generous strand clean steel production, meets the Sino-Russian eastern line in China, new feed channel etc. The product requirement of Hi-grade steel pipeline.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (5)

1. a kind of heavy wall heavy caliber X80M pipeline clean steels, which is characterized in that its chemical composition and mass percent are as follows：C： 0.04%~0.06%, Si：0.10%~0.30%, Mn：1.70%~1.80%, P≤0.013%, S：0.0010%, Nb：0.060%~ 0.070%, Ti：0.006%~0.020%, Ni：0.20%~0.30%, Cr：0.10%~0.20%, Cu：0.10%~0.30%, Mo： 0.10%~0.20%, Al：0.015%~0.050%, Ca：0.0005%~0.0040%, surplus is Fe and impurity.
2. one kind being applied to heavy wall heavy caliber X80M pipeline clean steel smelting processes described in claim 1, which is characterized in that packet Include following steps：
S1, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim after desulfurization clean, enter S≤0.0020% in stove molten iron, S≤0.0010% after converter；
S2, steel-making use the process route of BOF → LF stoves refining → RH refinings → continuous casting；Tapping Temperature of Bof 1660 DEG C~1680 ℃；Converter tapping carries out slag making using pro-molten refining slag+active lime；
S3, molten steel carry out heating slugging, 300 Nl/min of heating slugging process argon bottom-blowing flow~500Nl/ after reaching LF stoves min；It is properly added aluminium wire according to clinker situation, desulfurization operations, lime adding amount 1Kg/t, aluminium are carried out after reaching white slag and submerged arc Silk 0.1Kg/t, argon bottom-blowing flow 250Nl/min~350Nl/min feed aluminum steel and adjust molten steel aluminium content, during hello aluminum steel Control argon flow amount 20Nl/min~30Nl/min；Alloying, heating 6~8min samplings point are carried out according to the ingredient of target steel grade Analysis, lower electrode continue the desulfurization that heats up；Sulfur content is stablized within 0.0010% after LF alloyings；
S4, RH meet vacuum cycle 15min~20min under vacuum degree≤3mbar, and Calcium treatment, calcium are carried out after vacuum processing Processing uses seamless calcium line, and calcium line treating capacity 150m~180m, calcium content is 0.0015%~0.0025% after processing, Calcium treatment knot Shu Houjing stirs 20min；
S5, CCM cast are poured into a mould using full guard, are closed and are guaranteed replacement according to the big packet of big packet surplus setting 5t or less progress, middle packet overheats Degree meets 35 DEG C~40 DEG C.
3. a kind of heavy wall heavy caliber X80M pipeline clean steel smelting processes according to claim 2, it is characterised in that：It is described In step S3, aluminum steel feed quantity is maintained at 0.04%~0.05% range to control with aluminium content in smelting process molten steel.
4. a kind of heavy wall heavy caliber X80M pipeline clean steel smelting processes according to claim 2, it is characterised in that：It is described In step S4, vacuum processing is forbidden to carry out alloying operation to molten steel again after starting, and forbids to add deoxidier.
5. a kind of heavy wall heavy caliber X80M pipelines clean steel according to claim 2 and smelting process, it is characterised in that：Institute It states in step S5, middle covering agent uses liquid coverture, and the liquid coverture chemical composition and mass percent are as follows： CaO：20.0%~30.0%, MgO：10.0%~30.0%, Al2O3:15.0%~25.0%, SiO2:≤ 8.0%, CGu：≤ 1.0%, F： ≤ 0.50%, R:4.0%~6.0%, H2O:≤ 0.5%, surplus is impurity.
CN201810344280.6A 2018-04-17 2018-04-17 Thick-wall large-caliber X80M pipeline clean steel and smelting method Active CN108531807B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810344280.6A CN108531807B (en) 2018-04-17 2018-04-17 Thick-wall large-caliber X80M pipeline clean steel and smelting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810344280.6A CN108531807B (en) 2018-04-17 2018-04-17 Thick-wall large-caliber X80M pipeline clean steel and smelting method

Publications (2)

Publication Number Publication Date
CN108531807A true CN108531807A (en) 2018-09-14
CN108531807B CN108531807B (en) 2021-08-10

Family

ID=63481043

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810344280.6A Active CN108531807B (en) 2018-04-17 2018-04-17 Thick-wall large-caliber X80M pipeline clean steel and smelting method

Country Status (1)

Country Link
CN (1) CN108531807B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109234622A (en) * 2018-09-29 2019-01-18 南京钢铁股份有限公司 The strain resistant pipe line steel in the deep-sea X80M and smelting process
CN109321850A (en) * 2018-11-07 2019-02-12 南京钢铁股份有限公司 A kind of low grade of steel pipeline clean steel and smelting process
CN110016604A (en) * 2019-05-07 2019-07-16 南京钢铁股份有限公司 A kind of smelting process improving plate surface quality
CN112981242A (en) * 2021-02-01 2021-06-18 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and manufacturing method thereof
CN113046655A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof
CN113046628A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and smelting method
CN113278877A (en) * 2021-02-01 2021-08-20 南京钢铁股份有限公司 High-cleanliness pipeline steel and smelting method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102286705A (en) * 2011-09-15 2011-12-21 南京钢铁股份有限公司 Production process for steel plates for high-intensity X80 bent pipes
CN104232831A (en) * 2014-09-02 2014-12-24 南京钢铁股份有限公司 Low-carbon ultra-low sulfur steel smelting method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102286705A (en) * 2011-09-15 2011-12-21 南京钢铁股份有限公司 Production process for steel plates for high-intensity X80 bent pipes
CN104232831A (en) * 2014-09-02 2014-12-24 南京钢铁股份有限公司 Low-carbon ultra-low sulfur steel smelting method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109234622A (en) * 2018-09-29 2019-01-18 南京钢铁股份有限公司 The strain resistant pipe line steel in the deep-sea X80M and smelting process
CN109321850A (en) * 2018-11-07 2019-02-12 南京钢铁股份有限公司 A kind of low grade of steel pipeline clean steel and smelting process
CN110016604A (en) * 2019-05-07 2019-07-16 南京钢铁股份有限公司 A kind of smelting process improving plate surface quality
CN112981242A (en) * 2021-02-01 2021-06-18 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and manufacturing method thereof
CN113046655A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof
CN113046628A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and smelting method
CN113278877A (en) * 2021-02-01 2021-08-20 南京钢铁股份有限公司 High-cleanliness pipeline steel and smelting method thereof
CN113046655B (en) * 2021-02-01 2022-06-17 南京钢铁股份有限公司 Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof
CN112981242B (en) * 2021-02-01 2022-06-17 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and manufacturing method thereof
CN113046628B (en) * 2021-02-01 2022-06-17 南京钢铁股份有限公司 N800CF steel for pumped storage pressure steel pipe and smelting method

Also Published As

Publication number Publication date
CN108531807B (en) 2021-08-10

Similar Documents

Publication Publication Date Title
CN108531807A (en) A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process
CN102248142B (en) Method for producing medium and low carbon aluminum killed steel
CN109252008A (en) A kind of production method of low carbon, low nitrogen ultralow-sulfur steel
CN105603156B (en) The production method of super-low sulfur IF steel
CN107699654A (en) A kind of smelting process of ultra-low-carbon steel desulfurization rapidly
CN102268513B (en) Method for improving castability of molten steel of medium and low carbon steel
CN106399640B (en) Control the method for refining of brittle inclusion in bearing steel
CN102140566B (en) Method for improving cleanliness of low-carbon molten aluminum-killed steel
CN103741006B (en) A kind of preparation method containing the low nitrogen stainless steel of Ti
CN109112251A (en) A kind of smelting process for quickly making white slag
CN104004881A (en) Method for controlling nitrogen content in process of producing aluminium deoxidation high-carbon steel
CN109022664A (en) A method of Ti-IF steel is smelted using hot metal containing V-Ti
CN102851447B (en) Outside-furnace refining production method of steel used in carbon steel welding wire
CN105483501A (en) Method for smelting phosphorus-containing ultra-low carbon steel
CN107365890A (en) A kind of control method of X80 inclusion in pipeline steel
CN108998613A (en) Free oxygen control method in a kind of low aluminum steel of Ultra-low carbon
CN104087711A (en) Method for improving purity of molten steel and carbon alloy steel ingot
CN115044820B (en) Smelting method of ultralow-carbon ultralow-sulfur pure iron
CN114472825B (en) Continuous casting method of non-calcium-treated low-carbon aluminum-killed phosphorus-containing steel
CN114350879B (en) Smelting method of low-carbon ultralow-sulfur pure iron
CN103555886B (en) Method for smelting ultralow-sulfur steel by using vanadium-containing molten iron
CN101660022B (en) Method for improving steel cleanness of stainless steel
CN103215406B (en) Low-carbon and ultralow sulfur steel smelting method
CN108796173A (en) Improve the smelting process of heavy rail steel cleanness
CN113005261A (en) Comprehensive deoxidation and desulfurization process for smelting stainless steel by using small-capacity AOD furnace

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant