CN106498110B - A kind of smelting process of oil/gas well expansion pipe steel - Google Patents
A kind of smelting process of oil/gas well expansion pipe steel Download PDFInfo
- Publication number
- CN106498110B CN106498110B CN201610974021.2A CN201610974021A CN106498110B CN 106498110 B CN106498110 B CN 106498110B CN 201610974021 A CN201610974021 A CN 201610974021A CN 106498110 B CN106498110 B CN 106498110B
- Authority
- CN
- China
- Prior art keywords
- desulfurization
- steel
- slag
- dephosphorization
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C7/10—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
- C22C38/02—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
- C22C38/08—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of smelting processes of oil/gas well expansion pipe steel, belong to smelting and continuous casting control technology field.It the described method comprises the following steps：Molten iron is through KR desulfurization process, it fully skims after desulfurization, desulphurised hot metal goes out desulfurization dephosphorization desiliconization molten iron through dephosphorization converter dephosphorization, desiliconization processing rear slag stopping, desulfurization dephosphorization desiliconization molten iron is smelted through converter decarburization, pushing off the slag before and after tapping process, the interior pre-melted slag that is added of tapping process ladle carry out wash heat desulfurization process；Molten steel carries out RH vacuum refinings, completes dehydrogenation, goes to be mingled with, micro- Calcium treatment；Continuous casting carries out the casting of tundish low overheat full guard, controls constant low pulling rate, dynamic soft-reduction and end heavy reduction.The present invention has reached deoxidation products Al by the above method2O3It is predominantly converted to Al2O3CaS types field trash, the technique effect for reducing the segregation of slab manganese, and then realization expansion process is not easy to crack, prolonged expansion rate the Uniform Control.
Description
Technical field
The present invention relates to smelt and continuous casting control technology field, more particularly to a kind of smelting side of oil/gas well expansion pipe steel
Method.
Background technology
Expansion sleeve is typically the thick slab of continuous casting 1.2-1.8m wide, 0.23m, hot continuous rolling at 1.2-1.8m wide, about
The strip of 10mm thickness, then by strip slitting at HFW after 2~3 at pipe, homogeneous tube modulation heat treatment.Due to the use of expansion sleeve
Particularity, go into the well caliber expansion 10-30%, steel pipe when using need higher uniform elongation.Make as casing, patching tube
With, it would be desirable to be able to Anti -collapse, oil resistant-aqueous corrosion and resistance against hydrogen cracking.
Since steel pipe has higher requirements to Anti -collapse and resistance against hydrogen cracking, sulfur content need to be strictly controlled, low-sulfur can be effective
Reduce the quantity and size of MnS field trashes.Traditional method is to take LF stove depth desulfurization, but most of in steel after LF stove desulfurization
It is Al that field trash can be denaturalized by high calcium top slag2O3- CaO field trashes, Al2O3- CaO field trashes easily germinate implosion in expansion process
Line reduces the uniform elongation of steel pipe.
In addition, country's HFW tubulation apparatus forming abilities are limited, need the original yield strength of strip low as possible, Cheng Guanhou is whole
Pipe heat treatment modulation improves intensity and uniform elongation, and high manganese solution strengthening is taken from cost of alloy and structure property consideration.But
Slab will produce apparent manganese segregation when manganese content is more than 1.5%, and steel edge portion, a quarter and center manganese are inclined after hot rolling
It is larger to analyse degree difference, it is larger to postwelding weld seam both sides histological difference, cause weld seam both sides matrix strength to differ greatly, after expansion
Steel pipe uniform elongation decline.
Invention content
The purpose of the present invention is to provide a kind of smelting processes of oil/gas well expansion pipe steel, solve and deposit in the prior art
Al2O3Expansion tube is easy in expansion process caused by-CaO field trashes easily germinate internal fissure and manganese segregation in expansion process
The technical issues of cracking, steel pipe uniform elongation decline.
In order to solve the above technical problems, the present invention provides following technical solutions：
A kind of smelting process of oil/gas well expansion pipe steel, includes the following steps：
Step a, molten iron are fully skimmed through KR desulfurization process after desulfurization, and desulphurised hot metal is handled through dephosphorization converter dephosphorization, desiliconization
Rear slag stopping goes out desulfurization-dephosphorization-desiliconization molten iron, and desulfurization-dephosphorization-desiliconization molten iron is smelted through converter decarburization, pushing off the slag before and after tapping process,
Pre-melted slag is added in tapping process ladle and carries out wash heat desulfurization process；
Step b, molten steel carry out RH vacuum refinings, complete dehydrogenation, go to be mingled with, micro- Calcium treatment；
Step c, continuous casting carry out the casting of tundish low overheat full guard, control constant low pulling rate, dynamic soft-reduction and end
Hold heavy reduction.
Further, in the step a after KR desulfurization, S content≤0.0010%, rate >=98% of skimming after desulfurization.
Further, in the step a desulphurised hot metal after dephosphorization converter dephosphorization, desiliconization processing, S contents in molten iron≤
0.0020%, P content≤0.035%, Si content≤0.05%, the lower quantity of slag≤8kg/ tons of steel.
Further, pushing off the slag before and after tapping process in the step a, the lower quantity of slag≤5kg/ tons of steel.
Further, its ingredient is pre-melted slag by mass percentage in the step a：SiO2≤ 5%, CaO：50%-
56%, MgO≤5%, Al2O3：29%-35%, Al：4%-6%, the sum of above-mentioned each component mass percent are 100%；Fritting
8kg/ tons of steel of slag addition.
Further, RH refines the molten steel composition S≤0.0015% that arrives at a station, P≤0.010%, minimum vacuum in the step b
＜ 50Pa are spent, vacuum time >=15min terminates H content ＜ 0.0002%.
Further, micro- Calcium treatment refers to Calcium treatment and soft blow in the step b, and the remaining Ca that stablizes contains in steel after micro- Calcium treatment
Measure≤0.0015%, Ca/S ratios ＞ 0.8.
Further, 10-30 DEG C of tundish low overheat in the step c, pulling rate 1.0-1.5m/min.
Further, foundation continuous casting model calculating three sections of drafts of solidification end in step c, overall reduction 3.0-4.0mm,
End drafts is kept to account for the 50% of overall reduction.
Further, ingredient is the expansion pipe steel by mass percentage：C：0.050%~0.100%, Si≤
0.30%, Mn：1.50%~2.50%, Ni：0.20~0.90%, Ti≤0.02%, P≤0.010%, S≤0.002%, H≤
0.0002%, remaining is iron and inevitable trace impurity.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The smelting process of the oil/gas well expansion pipe steel provided in the embodiment of the present invention by KR desulfurization, is skimmed, dephosphorization stove
Dephosphorization, desiliconization, decarbonizing furnace decarburization realize that less-slag melting, smelting process time sulphur are few, pushing off the slag before and after converter tapping, and tapping wash heat is complete
At desulfurization and control sulphur, ultra-low sulfur is obtained, refinery practice is avoided and continues desulfurization, it is ensured that deoxidation products Al2O3It is predominantly converted to
Al2O3- CaS type field trashes；RH refinings terminate to carry out micro- Calcium treatment, to control field trash with Al2O3Based on-CaS, reduce
Al2O3- CaO field trash ratios, Al2O3The field trash deformation rate that-CaS is constituted is low, closer with the matrix coefficient of expansion, rolls
Journey and expansion process is non-breakable cracks source, deteriorates uniform elongation field trash to achieve the purpose that reduce；Pass through company
Low overheat casting, the measure of permanent low casting speed control, dynamic soft-reduction and end heavy reduction are cast, the segregation of slab manganese is reduced, subtracts
Small Center Equiaxial Crystal width realizes the band-like the Uniform Control of strip width, obtains uniform prolonged expansion rate.
Specific implementation mode
The embodiment of the present invention is solved and is deposited in the prior art by providing a kind of smelting process of oil/gas well expansion pipe steel
Al2O3Expansion tube is easy in expansion process caused by-CaO field trashes easily germinate internal fissure and manganese segregation in expansion process
The technical issues of cracking, steel pipe uniform elongation decline；Deoxidation products Al is reached2O3It is predominantly converted to Al2O3- CaS types are pressed from both sides
Sundries, the technique effect for reducing the segregation of slab manganese, and then realization expansion process is not easy to crack, prolonged expansion rate the Uniform Control.
In order to solve the above technical problems, the general thought that the embodiment of the present invention provides technical solution is as follows：
The present invention provides a kind of smelting process of oil/gas well expansion pipe steel, the expansion pipe steel by mass percentage at
It is divided into：C：0.050%~0.100%, Si≤0.30%, Mn：1.50%~2.50%, Ni：0.20~0.90%, Ti≤
0.02%, P≤0.010%, S≤0.002%, H≤0.0002%, remaining is iron and inevitable trace impurity.
For Gao Meng, super-low sulfur slab, desulfurization, control sulphur and a kind of control method of slab manganese segregation offer in smelting process,
The process route taken is：KR desulfurization → dephosphorization stove dephosphorization, desiliconization → converter decarburization → RH vacuum refinings → continuous casting.
The above method specifically includes following steps：
Step a, molten iron are fully skimmed through KR desulfurization process after desulfurization, and desulphurised hot metal is handled through dephosphorization converter dephosphorization, desiliconization
After take slag retaining cone pushing off the slag to go out desulfurization-dephosphorization-desiliconization molten iron, desulfurization-dephosphorization-desiliconization molten iron is through top and bottom combined blown converter decarburization smelting
It refines, slide plate pushing off the slag before and after tapping process, pre-melted slag, which is added, in tapping process ladle carries out wash heat desulfurization process；
Step b, molten steel carry out RH vacuum refinings, complete dehydrogenation, go to be mingled with, micro- Calcium treatment；
Step c, continuous casting carry out the casting of tundish low overheat full guard, control constant low pulling rate, dynamic soft-reduction and end
Hold heavy reduction.
The present invention relates to the Composition Control of steel grade, there are two difficult points, first, single RH refinings obtain super-low sulfur, second is that Mn contents
The control that sheet billet continuous casting process Mn is segregated when ＞ 1.5%.
The present invention technical principle be：
Super-low sulfur is obtained by way of ' KR desulfurization-converter dephosphorization-converters decarburization-tapping wash heat ', avoids refining work
Skill continues desulfurization, it is ensured that deoxidation products Al2O3It is predominantly converted to Al2O3- CaS type field trashes reduce Al2O3- CaO types are mingled with
Object ratio deteriorates uniform elongation field trash to achieve the purpose that reduce.' KR desulfurization-converter dephosphorization-converter decarburization-goes out slag
Wash ' obtain super-low sulfur critical control point pull down desulfurization slag, reduce dephosphorized slag enter ladle, reduce decarbonized slag enter steel
Packet, less-slag melting, it is therefore intended that reduce upper link high sulphur slag and enter next link.It is low by the casting of continuous casting low overheat, perseverance
The measures such as casting speed control, dynamic soft-reduction and heavy reduction, control steel in MnS the amount of inclusions as possible less, size it is small as possible, drop
Low slab manganese segregation reduces Center Equiaxial Crystal width, realizes the band-like the Uniform Control of strip width.
In order to better understand the above technical scheme, below in conjunction with specification and specific implementation mode to above-mentioned technology
Scheme is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the technology of the present invention side
The detailed description of case, rather than to the restriction of technical solution of the present invention, in the absence of conflict, the embodiment of the present invention and
Technical characteristic in embodiment can be combined with each other.
A kind of smelting process of oil/gas well expansion pipe steel, specifically includes following steps：
Step a：Molten iron is through KR desulfurization process, S content≤0.0010% after processing, rate >=98% of skimming after desulfurization；Desulfurization
Molten iron S content≤0.0020%, P content≤0.035%, Si content≤0.05% after dephosphorization converter dephosphorization, desiliconization processing, under
The quantity of slag≤8kg/ tons of steel；It is smelted through top and bottom combined blown converter decarburization after desulfurization, dephosphorization, desiliconization, slide plate pushing off the slag before and after tapping process turns
The quantity of slag≤5kg/ tons of steel under stove, the interior pre-melted slag that is added of tapping process ladle carry out wash heat desulfurization process, pre-melted slag addition 8kg/
Ton steel；
Its ingredient is the pre-melted slag by mass percentage：SiO2≤ 5%, CaO：50%-56%, MgO≤5%, Al2O3：
29%-35%, Al：4%-6%, the sum of above-mentioned each component mass percent are 100%；8kg/ tons of steel of pre-melted slag addition.
Step b：Molten steel carries out RH vacuum refinings, carries out dehydrogenation, goes to be mingled with, micro- Calcium treatment.RH vacuum refinings are arrived at a station molten steel
Ingredient S≤0.0015%, P≤0.012%, minimum vacuum degree ＜ 50Pa, vacuum time >=15min terminate H content ＜
0.0002%.It is remaining in steel after Calcium treatment, soft blow to stablize Ca content≤0.0015%, Ca/S ratios ＞ 0.8；
Step c：Full guard is cast, 10-25 DEG C of tundish low overheat, pulling rate 1.0-1.5m/min, according to continuous casting model
Three sections of drafts of solidification end are calculated, overall reduction 3.0-4.0mm keeps end drafts to account for the 50% of overall reduction.
Ingredient is the expansion pipe steel of production by mass percentage：C：0.050%~0.100%, Si≤0.30%, Mn：
1.50%~2.50%, Ni：0.20~0.90%, Ti≤0.02%, P≤0.010%, S≤0.002%, H≤0.0002%,
Remaining is iron and inevitable trace impurity.
Through the above as can be seen that smelting process passes through KR desulfurization-converter control sulphur-and go out slag without LF stove desulfurization
Sulphur is eluted, dephosphorization converter-decarburization converter smelting realizes fast pace, less-slag melting, and converter tapping deoxidation products is mainly Al2O3, then
In conjunction with micro- Calcium treatment after RH vacuum refinings, control slab field trash becomes with Al2O3Based on-CaS, Al is reduced2O3- CaO field trashes
Ratio, Al2O3The field trash deformation rate that-CaS is constituted is low, and closer with the matrix coefficient of expansion, the operation of rolling and expansion process are not easy
It is broken to crack source, and Al2O3Broken extend of the field trash operation of rolling that-CaO is constituted is in chain, is caused after steel pipe expansion
Uniform elongation is relatively low, deteriorates uniform elongation field trash to achieve the purpose that reduce；Pass through the casting of continuous casting low overheat, perseverance
Low pulling rate, dynamic soft-reduction, solidification end drafts, which account for the measures such as 50% of overall reduction, reduces manganese segregation.
It is for a more detailed description to the present invention by the following examples.These embodiments are only to the best embodiment party of the present invention
The description of formula does not have the scope of the present invention any limitation.
It singly pours time 6 stoves of production and may expand oil casing pipe steel, using ' KR desulfurization → dephosphorization stove dephosphorization, desiliconization → converter are de-
Carbon → RH vacuum refinings → continuous casting ' process route production.
Desulfurization-dephosphorization-decarbonizing process parameter is as shown in table 1, and RH vacuum refining process parameters are as shown in table 2, casting process
Parameter is as shown in table 3.It does low power in first piece of the first stoves and last block slab sampling of last stove for pouring secondary two stream respectively and comments
Grade, low power rating result are as shown in table 4.All slabs are rolled into the strip of 8-12mm, and volume two is taken to do band-like and be mingled with per stove
Object is graded, and the results are shown in Table 5.
Control parameter is smelted in 1 desulfurization of table-dephosphorization-decarburization
Table 2RH vacuum refining control parameters
3 sheet billet continuous casting control parameter of table
4 slab quality of table is graded
Note：1-1 is originally to pour the first-class first block of slab of time the first stove, and 1-2 is originally to pour time second-rate first block of slab of the first stove, 2-
1 is originally pours last first-class block slab of time last stove, and 2-2 is originally to pour time last second-rate block slab of last stove.
5 hot-strip quality classification of table
Note：1,2 ... 6 represent heat number, and a, b represent reel number.
The one or more technical solutions provided in the embodiment of the present invention, have at least the following technical effects or advantages：
The smelting process of the oil/gas well expansion pipe steel provided in the embodiment of the present invention by KR desulfurization, is skimmed, dephosphorization stove
Dephosphorization, desiliconization, decarbonizing furnace decarburization realize that less-slag melting, smelting process time sulphur are few, pushing off the slag before and after converter tapping, and tapping wash heat is complete
At desulfurization and control sulphur, ultra-low sulfur is obtained, refinery practice is avoided and continues desulfurization, it is ensured that deoxidation products Al2O3It is predominantly converted to
Al2O3- CaS type field trashes；RH refinings terminate to carry out micro- Calcium treatment, to control field trash with Al2O3Based on-CaS, reduce
Al2O3- CaO field trash ratios, Al2O3The field trash deformation rate that-CaS is constituted is low, closer with the matrix coefficient of expansion, rolls
Journey and expansion process is non-breakable cracks source, deteriorates uniform elongation field trash to achieve the purpose that reduce；Pass through company
Low overheat casting, the measure of permanent low casting speed control, dynamic soft-reduction and end heavy reduction are cast, the segregation of slab manganese is reduced, subtracts
Small Center Equiaxial Crystal width realizes the band-like the Uniform Control of strip width, obtains uniform prolonged expansion rate.
It should be noted last that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted,
Although being described the invention in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit of the technical scheme of the invention and range, should all cover
In the scope of the claims of the present invention.
Claims (8)
1. a kind of smelting process of oil/gas well expansion pipe steel, which is characterized in that include the following steps：
Step a, molten iron are fully skimmed through KR desulfurization process after desulfurization, and desulphurised hot metal is kept off after dephosphorization converter dephosphorization, desiliconization processing
Slag goes out desulfurization-dephosphorization-desiliconization molten iron, and desulfurization-dephosphorization-desiliconization molten iron is smelted through converter decarburization, pushing off the slag before and after tapping process, tapping
Pre-melted slag is added in process ladle and carries out wash heat desulfurization process；
Step b, molten steel carry out RH vacuum refinings, complete dehydrogenation, go to be mingled with, micro- Calcium treatment；
Step c, continuous casting carry out the casting of tundish low overheat full guard, it is big to control constant low pulling rate, dynamic soft-reduction and end
Drafts；
Wherein, 10-30 DEG C of tundish low overheat in the step c, pulling rate 1.0-1.5m/min；
Three sections of drafts of solidification end are calculated according to continuous casting model in step c, overall reduction 3.0-4.0mm keeps end pressure
Amount accounts for the 50% of overall reduction.
2. the smelting process of oil/gas well expansion pipe steel as described in claim 1, which is characterized in that KR is de- in the step a
After sulphur, S content≤0.0010%, rate >=98% of skimming after desulfurization.
3. the smelting process of oil/gas well expansion pipe steel as claimed in claim 2, which is characterized in that desulfurization in the step a
Molten iron is after dephosphorization converter dephosphorization, desiliconization processing, S content≤0.0020% in molten iron, and P content≤0.035%, Si content≤
0.05%, the lower quantity of slag≤8kg/ tons of steel.
4. the smelting process of oil/gas well expansion pipe steel as claimed in claim 3, which is characterized in that tap in the step a
Pushing off the slag before and after process, the lower quantity of slag≤5kg/ tons of steel.
5. the smelting process of oil/gas well expansion pipe steel as claimed in claim 4, which is characterized in that fritting in the step a
Its ingredient is slag by mass percentage：SiO2≤ 5%, CaO：50%-56%, MgO≤5%, Al2O3：29%-35%, Al：
4%-6%, the sum of above-mentioned each component mass percent are 100%；8kg/ tons of steel of pre-melted slag addition.
6. the smelting process of oil/gas well expansion pipe steel as described in claim 1, which is characterized in that RH essences in the step b
Refining is arrived at a station molten steel composition S≤0.0015%, P≤0.010%, minimum vacuum degree ＜ 50Pa, vacuum time >=15min, is terminated H and is contained
Measure ＜ 0.0002%.
7. the smelting process of oil/gas well expansion pipe steel as claimed in claim 6, which is characterized in that micro- calcium in the step b
It handles and refers to Calcium treatment and soft blow, it is remaining in steel after micro- Calcium treatment to stablize Ca content≤0.0015%, Ca/S ratios ＞ 0.8.
8. the smelting process of the oil/gas well expansion pipe steel as described in any claim in claim 1-7, which is characterized in that
Ingredient is the expansion pipe steel by mass percentage：C：0.050%~0.100%, Si≤0.30%, Mn：1.50%~
2.50%, Ni：0.20~0.90%, Ti≤0.02%, P≤0.010%, S≤0.002%, H≤0.0002%, remaining is iron
With inevitable trace impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974021.2A CN106498110B (en) | 2016-10-28 | 2016-10-28 | A kind of smelting process of oil/gas well expansion pipe steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974021.2A CN106498110B (en) | 2016-10-28 | 2016-10-28 | A kind of smelting process of oil/gas well expansion pipe steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106498110A CN106498110A (en) | 2017-03-15 |
| CN106498110B true CN106498110B (en) | 2018-08-21 |
Family
ID=58323767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610974021.2A Active CN106498110B (en) | 2016-10-28 | 2016-10-28 | A kind of smelting process of oil/gas well expansion pipe steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106498110B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107081412B (en) * | 2017-04-01 | 2019-08-09 | 唐山钢铁集团有限责任公司 | The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base |
| CN109881116A (en) * | 2019-03-20 | 2019-06-14 | 首钢集团有限公司 | A kind of wheel strip of high fatigue property and preparation method thereof |
| CN111876654B (en) * | 2020-07-01 | 2021-12-07 | 石横特钢集团有限公司 | Production method of low-temperature impact resistant blank for D-level power angle steel |
| CN113293253B (en) * | 2021-04-30 | 2023-03-17 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-cleanliness heat-system variety steel at low cost |
| CN116334475A (en) * | 2021-12-22 | 2023-06-27 | 中国石油天然气集团有限公司 | Economic 550MPa hot-rolled H-shaped steel for ultra-deep well derrick and production method |
-
2016
- 2016-10-28 CN CN201610974021.2A patent/CN106498110B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106498110A (en) | 2017-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106498110B (en) | A kind of smelting process of oil/gas well expansion pipe steel | |
| CN106521293B (en) | Rare earth metal is added in a kind of steel and puies forward high performance method | |
| CN106636560B (en) | A kind of production method of guard rail Properties of Heavy Rail Steel | |
| CN103334050B (en) | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel | |
| CN103882303B (en) | Smelting method of steel for gas shielded welding wire | |
| CN104278197B (en) | Smelting method of steel for low-silicon high-titanium welding wire | |
| CN109082496A (en) | A kind of method of whole process hypoxemia position smelting suprelow carbon steel | |
| CN114574770B (en) | Preparation method of high-strength fatigue-resistant 60Si2MnA spring steel | |
| CN102345062A (en) | Low alloy Q345D steel plate with thickness less than 20mm and ensured flaw detection | |
| CN107841687B (en) | A kind of smelting process of ultralow boron steel | |
| CN104694819A (en) | Production method for low-carbon low-silicon steel | |
| CN102864378B (en) | Process for smelting low-cost X70 pipeline steel moderate-thickness plate blanks | |
| CN105537549B (en) | The production method of 100 DEG C of low temperature seamless steel pipe steel continuous cast round billets | |
| CN102248142A (en) | Method for producing medium and low carbon aluminum killed steel | |
| CN103215410B (en) | A kind of method improved containing Nb, Ti steel cleanness | |
| CN108531807A (en) | A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process | |
| CN114293101B (en) | Economical high-grade welding wire steel H04E and preparation method thereof | |
| CN102644018B (en) | Smelting process used for plate blanks of medium and heavy plates of hydrogen induced cracking resistant pipeline steel | |
| CN111485052A (en) | Smelting method of 97-grade ultrahigh-strength cord steel | |
| CN110331249A (en) | A kind of smelting process of oil casing steel 26CrMoVTiB | |
| CN106834612A (en) | A kind of production method of ultra-low silicon peritectic steel | |
| CN101698897B (en) | Technology of quickly producing white slag by deep desulphurizing after converter tapping | |
| CN102864274B (en) | Method for producing silicon steel with converter | |
| CN106048124A (en) | Technique for producing train axle steel through molten iron and stepped argon blowing sealing structure for technique | |
| CN116875912A (en) | High-purity high-carbon steel wire rod and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant before: Capital Iron & Steel General Company |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |