CN106282802A - A kind of production technology controlling pipe line steel Large Inclusions - Google Patents
A kind of production technology controlling pipe line steel Large Inclusions Download PDFInfo
- Publication number
- CN106282802A CN106282802A CN201610962055.XA CN201610962055A CN106282802A CN 106282802 A CN106282802 A CN 106282802A CN 201610962055 A CN201610962055 A CN 201610962055A CN 106282802 A CN106282802 A CN 106282802A
- Authority
- CN
- China
- Prior art keywords
- desulfurization
- pipe line
- sulfur
- steel
- vacuum
- 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.)
- Pending
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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/02—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
- C22C38/06—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of production technology controlling pipe line steel Large Inclusions, use the composition design of hypoxia high-sulfur；Molten iron pretreatment, desulfurization station uses liquid oxidatively calcium to carry out desulfurization with the mode of magnesium powder mixed injection, and desulfurization takes off Slag treatment after terminating deeply；LF undertakes desulfurization and alloying task, and pipe line steel finished product sulfur sets the upper limit≤0.005%；RH application of vacuum, vacuum is less than 3MPa, and the pure vacuum time is not less than 15 minutes, advantageously forms CaS Al2O3The solid inclusions of type, it is ensured that the field trash in molten steel can fully float；CCM casting process uses low overheat, electromagnetic agitating technology, it is ensured that within low power grading reaches smelting mark C1.0, reduce center segregation, prevent the generation that MnS is mingled with.The present invention improves the low-temperature flexibility of product, decreases the harm to plate property of large-sized inclusions, improves the welding performance after tubulation, thus improves steel internal soundness.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of production technology controlling pipe line steel Large Inclusions.
Background technology
Along with being continuously increased of World Economics energy demand, the pipeline conveying to oil, natural gas relies on increasing, defeated
The Service Environment sending pipeline requires increasingly harsher, it is desirable to possess high pressure resistant, heavy caliber, deep-sea, antidetonation acid resistance, the most right
The requirement of pipeline mother metal performance is increasingly stricter, has the steel plate ability occuping market of relatively high-cleanness, high, preferable low-temperature flexibility,
Under this requirement background, with colleges and universities together cooperation tackled key problems clean steel smelt problem, by field trash mechanism of production being
System is analyzed, and in conjunction with producing practical situation, has formulated a kind of production technology controlling pipe line steel Large Inclusions, has improve molten steel
Degree of purity, meets customer requirement.
Pipe line steel requires low-carbon (LC), low-phosphorous, low-sulfur, and mainly using aluminum, Calx is primary raw material, therefore, can produce substantial amounts of
CaO、Al2O3Series field trash, is analyzed by thermodynamics:
[Ca]+1/3(Al2O3)→(CaO)+2/3[Al]
ΔG0=-356297.7+71.8T
[Ca]+[O]→(CaO)
ΔG0=-645421+146T
[Ca]+[S]→(CaS)
ΔG0=-530900+116.2T
(CaO)+[S]→(CaS)+[O]
ΔG0=114521-29.8T
After RH vacuum terminates, carry out Calcium treatment, understand by thermodynamic analysis, Ca elder generation and field trash Al in molten steel2O3And
In steel O, S reaction, generate CaO and CaS, and with remaining Al2O3In conjunction with forming CaO-Al2O3-CaS, then in field trash
CaO reacts with S in steel, causes CaO content in field trash to reduce.Due under low T.O content, CaO Yu the S extent of reaction
Greatly, therefore, by reducing molten steel T.O content, make CaO with S in field trash react, cause CaO content in field trash to reduce,
Finally will form CaS-Al2O3。
Summary of the invention
It is an object of the invention to provide a kind of production technology controlling pipe line steel Large Inclusions, design from product composition,
After desulfurization, convertor deacidification, the weak sulfur removal technology of LF, RH vacuum, quantitative Calcium treatment, CCM cast cold technology cooperate, thus really
Protect being effectively improved of pipe line steel Molten Steel Cleanliness.
The purpose of the present invention is achieved through the following technical solutions:
A kind of production technology controlling pipe line steel Large Inclusions, it is characterised in that the method specifically comprises the following steps that
1) pipe line steel, has carried out rational design according to Control and Inclusion Removal formation mechenism to pipe line steel composition, have employed one
Plant the composition design of hypoxia high-sulfur；Its composition is C 0.04～0.07% by weight percentage, Si0.10～0.35%, Mn
1.30～1.70%, P≤0.015%, S≤0.0050%, Nb 0.010～0.070%, Ti 0.006～0.020%, Ni≤
0.30%, Cr≤0.30%, Cu≤0.30%, Al 0.015～0.050%, surplus is Fe and impurity；
2) molten iron pretreatment, desulfurization station uses liquid oxidatively calcium to carry out desulfurization with the mode of magnesium powder mixed injection, and desulfurization is tied
Deeply taking off Slag treatment, desulfurization station desulfurization standard≤0.005% after bundle, converter uses self-produced steel scrap, it is ensured that converter tapping sulfur reaches
To≤0.010%, converter tapping adds aluminium block and carries out strong deoxidation, and addition 35Kg/100ppm is ready for LF desulfurization；
3) LF undertakes desulfurization and alloying task, and pipe line steel finished product sulfur sets the upper limit≤0.005%, on the one hand prevents sulfuration
The generation that manganese is mingled with, returns sulfur and causes finished product composition to surpass internal control, its objective is to weaken LF slag circle after on the other hand preventing RH vacuum
The reaction in face, the molten steel environment for high-sulfur hypoxia is prepared simultaneously；
4) RH application of vacuum, vacuum is less than 3MPa, and the pure vacuum time is not less than 15 minutes, when rough vacuum extends vacuum
Between can reduce the gas content in molten steel to greatest extent, improve the cleanliness factor of molten steel, RH vacuum carries out 120 meters of nothings after terminating
Stitching pure calcium line and carry out Calcium treatment, molten steel environment now is in the environment of high-sulfur hypoxia, advantageously forms CaS-Al2O3Type
Solid inclusions, carry out 15 minutes after Calcium treatment quiet stirs, it is ensured that the field trash in molten steel can fully float；
5) in CCM casting process use low overheat, electromagnetic agitating technology, it is ensured that low power grading reach smelting mark C1.0 with
In, reduce center segregation, prevent the generation that MnS is mingled with.
Step 3) in, pipe line steel finished product sulfur controls 0.002～0.004%.Step 2) in, use strong de-during converter tapping
Oxygen technique, it is ensured that sulfur content≤0.010% after converter tapping, alleviates LF desulfurization pressure.
Pipe line steel is mainly used in the conveyance conduit such as oil, natural gas, and properties of product should meet extremely tremble with fear area, high-pressure delivery,
High intensity ultralow temperature impact flexibility, long distance delivery must also have good welding performance.Once Pipeline Steel Plate mother metal exists
Substantial amounts of large-sized inclusions, can cause ultrasonic examination defective, and become hydrogen induced cracking source, eventually reduce steel plate mechanics
Performance.
By to containing dissimilar field trash (CaO-CaS, CaS-Al2O3,CaO-Al2O3) pipe line steel be mingled with
Analyte detection, draw large-sized inclusions composition mainly based on calcium-aluminate, high-melting-point CaO-CaS or CaS-in this type impurity
Al2O3Field trash is easier to float than low melting point calcium-aluminate field trash, meanwhile, is high-melting-point by Control and Inclusion Removal and is difficult to
The CaS-Al of deformation2O3Field trash, can effectively reduce large-sized inclusions composition in strand.By laboratory and industrial experiment
Research, draws CaS-Al2O3Field trash is to be formed under high-sulfur (>=13ppm) and low T.O content (≤11ppm), therefore, at pipe
During line steel produces, on the one hand properly increasing molten steel sulfur content, meanwhile, RH improves removal efficiency of the inclusion in processing, it is ensured that at RH
After reason, molten steel T.O content is within 11ppm.When, after molten steel sulfur content and T, O stability contorting, Ca can be by field trash control after processing
It is made as CaS-Al2O3Field trash.
The present invention pass through process modification, improve the low-temperature flexibility of product, decrease large-sized inclusions to steel plate
The harm of energy, improves the welding performance after tubulation, remarkable in economical benefits.
The present invention uses the mode of production of a kind of innovation to reach to improve the purpose of Molten Steel Cleanliness, design from product composition,
After desulfurization, convertor deacidification, the weak sulfur removal technology of LF, RH vacuum, quantitative Calcium treatment, CCM cast cold technology cooperate, thus really
Protect being effectively improved of pipe line steel Molten Steel Cleanliness.
The present invention is simultaneously suitable for the clean steel of other low-carbon alloy steel and produces.
Detailed description of the invention
A kind of production technology controlling pipe line steel Large Inclusions, its composition be by weight percentage C 0.04～
0.07%, Si 0.10～0.35%, Mn 1.30～1.70%, P≤0.015%, S≤0.0050%, Nb 0.010～
0.070%, Ti 0.006～0.020%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Al 0.015～0.050%,
Surplus is Fe and impurity；Specifically comprise the following steps that
By field trash formation mechenism has been carried out systematic analysis, product design have employed the design of high-sulfur hypoxia, beneficially shape
Become CaS-Al2O3The solid inclusions of type.
Molten iron pretreatment use liquid Calx carry out mixing desulfurization with magnesium powder, guarantee by deeply skimming into stove molten iron sulfur≤
0.005%, converter uses self-produced steel scrap, reduces converter steelmaking process and increases sulfur content, uses strong deoxidization technique, press during converter tapping
100ppm oxygen adds 35Kg fine aluminium block and carries out strong deoxidation, it is ensured that sulfur content≤0.010% after converter tapping, alleviates LF desulfurization pressure
Power.
The intensification of LF Main Function, desulfurization, alloying, due to the minimizing of desulfurization pressure, weaken the reaction between slag steel significantly,
Under the influence of product design, LF tapping sulfur is stable between 0.002～0.004%, for generating CaS-Al2O3The solid-state of type
Field trash provides precondition.
RH uses condition of high vacuum degree, extends vacuum processing time, can effectively eliminate N, H, O harmful gas in molten steel, very
Sky carries out quantitative 120 meters of seamless pure calcium line Calcium treatment after terminating, Calcium treatment carries out after terminating 15 minutes quiet stirring, it is ensured that field trash fills
Divide and float, improve Molten Steel Cleanliness.
CCM casting cycle uses the Prepared by Low Superheat Pouring of 10～20 degree, uses electromagnetic agitation technique, it is ensured that strand core simultaneously
Portion's quality, the generation of suppression manganese sulfide inclusion.
Embodiment
A kind of production technology controlling pipe line steel Large Inclusions, by rational composition design, molten iron pretreatment the most de-
Sulfur, LF sulfur removal technology, RH high vacuum degassing, quantitative Calcium treatment technique, CCM cast cold technology, improve Molten Steel Cleanliness, improves
Inner Quality of Billet, improves economic benefit.
The present embodiment selects X60, X70, X80 steel grade, and its chemical composition is shown in Table 1, table 2, table 3, and whole smelting process controls
As follows:
Table 1X60 chemical analysis (%)
Table 2X70 chemical analysis (%)
Table 3X80 chemical analysis (%)
Production process and field trash testing result are shown in Table 4, table 5, table 6.
Table 4 field trash checks result
Table 5 field trash checks result
Table 6 field trash checks result
The present invention pass through process modification, improve the low-temperature flexibility of product, decrease large-sized inclusions to steel plate
The harm of energy, improves the welding performance after tubulation, and the present invention is simultaneously suitable for the clean steel of other low-carbon alloy steel and produces.
Claims (3)
1. the production technology controlling pipe line steel Large Inclusions, it is characterised in that the method specifically comprises the following steps that
1) pipe line steel, has carried out rational design according to Control and Inclusion Removal formation mechenism to pipe line steel composition, have employed a kind of low
The composition design of oxygen high-sulfur；Its composition is C 0.04～0.07% by weight percentage, Si 0.10～0.35%, Mn 1.30～
1.70%, P≤0.015%, S≤0.0050%, Nb 0.010～0.070%, Ti 0.006～0.020%, Ni≤0.30%, Cr≤
0.30%, Cu≤0.30%, Al 0.015～0.050%, surplus is Fe and impurity；
2) molten iron pretreatment, desulfurization station uses liquid oxidatively calcium to carry out desulfurization, after desulfurization terminates with the mode of magnesium powder mixed injection
Deeply take off Slag treatment, desulfurization station desulfurization standard≤0.005%, converter uses self-produced steel scrap, it is ensured that and converter tapping sulfur reaches≤
0.010%, converter tapping adds aluminium block and carries out strong deoxidation, and addition 35Kg/100ppm is ready for LF desulfurization；
3) LF undertakes desulfurization and alloying task, and pipe line steel finished product sulfur sets the upper limit≤0.005%, on the one hand prevents Manganese monosulfide. from pressing from both sides
Miscellaneous generation, returns sulfur and causes finished product composition to surpass internal control, its objective is to weaken LF slag interface after on the other hand preventing RH vacuum
Reaction, the molten steel environment for high-sulfur hypoxia is prepared simultaneously；
4) RH application of vacuum, vacuum is less than 3MPa, and the pure vacuum time is not less than 15 minutes, and rough vacuum extends vacuum time
The gas content reduced in molten steel of limits, improves the cleanliness factor of molten steel, and RH vacuum carries out 120 meters of seamless pure calcium lines after terminating
Carrying out Calcium treatment, molten steel environment now is in the environment of high-sulfur hypoxia, advantageously forms CaS-Al2O3The solid-state of type is mingled with
Thing, carry out 15 minutes after Calcium treatment quiet stirs, it is ensured that the field trash in molten steel can fully float；
5) CCM casting process uses low overheat, electromagnetic agitating technology, it is ensured that within low power grading reaches smelting mark C1.0, subtract
Few center segregation, prevents the generation that MnS is mingled with.
The production technology of control pipe line steel Large Inclusions the most according to claim 1, it is characterised in that: in step 3),
Pipe line steel finished product sulfur controls 0.002～0.004%.
The production technology of control pipe line steel Large Inclusions the most according to claim 1, it is characterised in that: step 2) in,
Use strong deoxidization technique during converter tapping, it is ensured that sulfur content≤0.010% after converter tapping, alleviate LF desulfurization pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610962055.XA CN106282802A (en) | 2016-11-04 | 2016-11-04 | A kind of production technology controlling pipe line steel Large Inclusions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610962055.XA CN106282802A (en) | 2016-11-04 | 2016-11-04 | A kind of production technology controlling pipe line steel Large Inclusions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106282802A true CN106282802A (en) | 2017-01-04 |
Family
ID=57719596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610962055.XA Pending CN106282802A (en) | 2016-11-04 | 2016-11-04 | A kind of production technology controlling pipe line steel Large Inclusions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106282802A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107502836A (en) * | 2017-08-07 | 2017-12-22 | 南京钢铁股份有限公司 | A kind of heavy wall large-caliber high-steel grade pipe line steel and its manufacture method for improving low-temperature flexibility |
| CN109280732A (en) * | 2018-11-08 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of high cleanliness acid-resistant pipeline steel smelting process |
| 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 |
| CN111041147A (en) * | 2019-12-18 | 2020-04-21 | 唐山中厚板材有限公司 | Method for controlling B-type inclusions in pipeline steel |
| CN111519083A (en) * | 2020-05-14 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540833A (en) * | 2013-09-30 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel |
| CN104264069A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Super-thick X70 pipeline steel and manufacturing method thereof |
| CN105506472A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Hot-rolled steel plate for 560 MPa-grade deep sea pipeline and production method thereof |
| CN105950972A (en) * | 2016-05-13 | 2016-09-21 | 江阴兴澄特种钢铁有限公司 | Thick-specification X80 pipeline steel plate with process time being shortened and manufacturing method thereof |
| CN105986173A (en) * | 2016-06-16 | 2016-10-05 | 山东钢铁股份有限公司 | Large-strain X80HD2 pipeline steel pipe and steel plate used for pipeline steel pipe |
-
2016
- 2016-11-04 CN CN201610962055.XA patent/CN106282802A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540833A (en) * | 2013-09-30 | 2014-01-29 | 湖南华菱湘潭钢铁有限公司 | Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel |
| CN105506472A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Hot-rolled steel plate for 560 MPa-grade deep sea pipeline and production method thereof |
| CN104264069A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Super-thick X70 pipeline steel and manufacturing method thereof |
| CN105950972A (en) * | 2016-05-13 | 2016-09-21 | 江阴兴澄特种钢铁有限公司 | Thick-specification X80 pipeline steel plate with process time being shortened and manufacturing method thereof |
| CN105986173A (en) * | 2016-06-16 | 2016-10-05 | 山东钢铁股份有限公司 | Large-strain X80HD2 pipeline steel pipe and steel plate used for pipeline steel pipe |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107502836A (en) * | 2017-08-07 | 2017-12-22 | 南京钢铁股份有限公司 | A kind of heavy wall large-caliber high-steel grade pipe line steel and its manufacture method for improving low-temperature flexibility |
| CN107502836B (en) * | 2017-08-07 | 2019-03-01 | 南京钢铁股份有限公司 | A kind of heavy wall large-caliber high-steel grade pipe line steel and its manufacturing method improving low-temperature flexibility |
| 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 |
| WO2020093711A1 (en) * | 2018-11-07 | 2020-05-14 | 南京钢铁股份有限公司 | Low-steel-grade pipeline clean steel and smelting process therefor |
| CN109280732A (en) * | 2018-11-08 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of high cleanliness acid-resistant pipeline steel smelting process |
| CN111041147A (en) * | 2019-12-18 | 2020-04-21 | 唐山中厚板材有限公司 | Method for controlling B-type inclusions in pipeline steel |
| CN111519083A (en) * | 2020-05-14 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104630418B (en) | A kind of high-cleanness, high pipeline steel smelting technique | |
| CN106282802A (en) | A kind of production technology controlling pipe line steel Large Inclusions | |
| CN109321850A (en) | A kind of low grade of steel pipeline clean steel and smelting process | |
| CN113046655B (en) | Wide and thick pipeline steel with excellent low-temperature toughness and manufacturing method thereof | |
| CN102051530B (en) | 48MnV nitrogenous steel and nitrogen adding process thereof | |
| CN102248142B (en) | Method for producing medium and low carbon aluminum killed steel | |
| CN106399633B (en) | A kind of ship steel molten steel magnesium treatment process | |
| CN101121987B (en) | Smelting method for titanium-containing austenitic stainless steel | |
| CN107699654A (en) | A kind of smelting process of ultra-low-carbon steel desulfurization rapidly | |
| CN106011377A (en) | Control technology for B-class inclusions of low-carbon low-sulfur pipeline steel | |
| CN104232831A (en) | Low-carbon ultra-low sulfur steel smelting method | |
| CN103898269A (en) | Ultralow sulfur steel quick smelting method | |
| CN108660381A (en) | A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection | |
| CN102268513B (en) | Method for improving castability of molten steel of medium and low carbon steel | |
| KR20220035339A (en) | Polar steel smelting method to control inclusions | |
| CN109797345B (en) | Steel for sulfur-resistant gas cylinder pipe and manufacturing method thereof | |
| CN105648148B (en) | A kind of super-purity ferrite stainless steel deoxidation and the method for Control and Inclusion Removal | |
| CN102277534A (en) | Hot rolled steel section for gas cylinders and production method thereof | |
| CN101135021B (en) | Aluminium magnesium ferroalloy for molten steel deoxidization desulfuration and alloying and preparation method thereof | |
| CN106555124B (en) | The preparation method of Gao Ge, high molybdenum ferritic stainless steel | |
| CN109811257A (en) | A kind of deep-sea acid-resistant pipeline steel and smelting process | |
| CN103757554B (en) | A kind of electronic gas Large Copacity gas vessel and preparation method thereof | |
| CN107354269A (en) | The method that RH complex deoxidizations produce ultra-low-carbon steel | |
| CN110004371A (en) | A kind of abrasion-resistant stee and smelting process | |
| CN107099747A (en) | A kind of production technology of control acid-resistant pipeline steel Large Inclusions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170104 |