CN106498110A - 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
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- CN106498110A CN106498110A CN201610974021.2A CN201610974021A CN106498110A CN 106498110 A CN106498110 A CN 106498110A CN 201610974021 A CN201610974021 A CN 201610974021A CN 106498110 A CN106498110 A CN 106498110A
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- desulfurization
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- slag
- expansion pipe
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of smelting process of Oil/gas Well expansion pipe steel, belongs to smelting and continuous casting control technology field.The method comprising the steps of：Molten iron is through KR desulfurization process, fully skim after desulfurization, desulphurised hot metal processes rear slag stopping through dephosphorization converter dephosphorization, desiliconization and goes out desulfurization dephosphorization desiliconization molten iron, desulfurization dephosphorization desiliconization molten iron is smelted through converter decarburization, pre-melted slag is added to carry out wash heat desulfurization process in pushing off the slag before and after tapping process, tapping process ladle；Molten steel carries out RH vacuum refinings, complete dehydrogenation, go 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 productss Al by said method2O3It is predominantly converted to Al2O3CaS type field trashes, the technique effect for reducing slab manganese segregation, and then realize that expansion process is easy to crack, prolonged expansion rate the Uniform Control.
Description
Technical field
The present invention relates to smelting 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 width, 0.23m, hot continuous rolling into 1.2-1.8m width, about
The thick strip steel of 10mm, then by strip steel slitting into HFW after 2～3 into pipe, heat treatment modulated by homogeneous tube.Use due to expansion sleeve
Particularity, go into the well caliber expansion 10-30% when using, and steel pipe needs higher uniform elongation.Make as sleeve pipe, patching tube
With, it would be desirable to be able to Anti -collapse, oil resistant-aqueous corrosion and resistance against hydrogen cracking.
As 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 the depth desulfurization of LF stoves, but most of in steel after LF stove desulfurization
Field trash can be Al by the slag degeneration of high calcium top2O3- CaO field trashes, Al2O3- CaO field trashes easily germinate implosion in expansion process
Stricture of vagina, reduces the uniform elongation of steel pipe.
In addition, country's HFW tubulation apparatus forming abilities are limited, need that the original yield strength of strip steel is as far as possible low, Cheng Guanhou is whole
The modulation of pipe heat treatment improves intensity and uniform elongation, takes high manganese solution strengthening from cost of alloy and structure property consideration.But
When manganese content is more than 1.5%, slab can produce obvious manganese segregation, and after hot rolling, steel edge portion, a quarter and center manganese are inclined
Analysis degree difference is larger, larger to postwelding weld seam both sides histological difference, causes weld seam both sides matrix strength to differ greatly, after expansion
Steel pipe uniform elongation decline.
Content of the invention
It is an object of the invention to provide a kind of smelting process of Oil/gas Well expansion pipe steel, solves in prior art and deposits
Al2O3Caused by-CaO field trashes easily germinate internal fissure and manganese segregation in expansion process, expansion tube is easy in expansion process
The technical problem that cracking, steel pipe uniform elongation decline.
For solving above-mentioned technical problem, the invention provides following technical scheme：
A kind of smelting process of Oil/gas Well expansion pipe steel, comprises the following steps：
Step a, molten iron are fully skimmed after desulfurization through KR desulfurization process, and desulphurised hot metal is processed 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 to carry out wash heat desulfurization process in tapping process ladle；
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
End heavy reduction.
Further, in step a after KR desulfurization, S content≤0.0010%, rate >=98% of skimming after desulfurization.
Further, after in step a, desulphurised hot metal is processed through dephosphorization converter dephosphorization, desiliconization, S contents in molten iron≤
0.0020%, P content≤0.035%, Si content≤0.05%, the lower quantity of slag≤8kg/ ton steel.
Further, pushing off the slag before and after tapping process in step a, the lower quantity of slag≤5kg/ ton steel.
Further, in the step a pre-melted slag its composition is by mass percentage：SiO2≤ 5%, CaO：50%-
56%, MgO≤5%, Al2O3：29%-35%, Al：4%-6%, above-mentioned each component mass percent sum are 100%；Fritting
Slag addition 8kg/ ton steel.
Further, in step b, RH refines are arrived at a station molten steel composition S≤0.0015%, P≤0.010%, minimum vacuum
Degree ＜ 50Pa, vacuum time >=15min terminate H content ＜ 0.0002%.
Further, in step b, micro- Calcium treatment refers to Calcium treatment and soft blow, and after micro- Calcium treatment, in steel, remaining stable Ca contains
≤ 0.0015%, Ca/S is than ＞ 0.8 for amount.
Further, 10-30 DEG C of tundish low overheat in 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, composition 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 ferrum and inevitable trace impurity.
The one or more technical schemes provided in the embodiment of the present invention, at least have the following technical effect that or advantage：
The smelting process of the Oil/gas Well expansion pipe steel provided in the embodiment of the present invention, by KR desulfurization, skims, dephosphorization stove
Dephosphorization, desiliconization, decarbonizing furnace decarburization realize that less-slag melting, smelting process time sulfur is few, and pushing off the slag before and after converter tapping, tapping wash heat are complete
Into desulfurization and control sulfur, ultra-low sulfur is obtained, it is to avoid refinery practice continues desulfurization, it is ensured that deoxidation productss Al2O3It is predominantly converted to
Al2O3- CaS type field trashes；RH refines terminate to carry out micro- Calcium treatment, so as 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 be not broken to crack source, reduces the purpose for deteriorating uniform elongation field trash so as to reach；By even
The measure of casting low overheat casting, permanent low casting speed control, dynamic soft-reduction and end heavy reduction, reduces slab manganese segregation, subtracts
Little Center Equiaxial Crystal width, realizes strip width banding the Uniform Control, obtains uniform prolonged expansion rate.
Specific embodiment
The embodiment of the present invention is solved in prior art and is deposited by providing a kind of smelting process of Oil/gas Well expansion pipe steel
Al2O3Caused by-CaO field trashes easily germinate internal fissure and manganese segregation in expansion process, expansion tube is easy in expansion process
The technical problem that cracking, steel pipe uniform elongation decline；Deoxidation productss Al is reached2O3It is predominantly converted to Al2O3- CaS types are pressed from both sides
Debris, the technique effect for reducing slab manganese segregation, and then realize that expansion process is easy to crack, prolonged expansion rate the Uniform Control.
For solving above-mentioned technical problem, the general thought that the embodiment of the present invention provides technical scheme 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 into
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 are ferrum and inevitable trace impurity.
For Gao Meng, super-low sulfur slab, desulfurization, control sulfur and the segregation of slab manganese in smelting process provides a kind of control method,
The process route that is taken is：KR desulfurization → dephosphorization stove dephosphorization, desiliconization → converter decarburization → RH vacuum refinings → continuous casting.
Said method specifically includes following steps：
Step a, molten iron are fully skimmed after desulfurization through KR desulfurization process, and desulphurised hot metal is processed 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
Pre-melted slag is added to carry out wash heat desulfurization process in refining, slide plate pushing off the slag before and after tapping process, tapping process ladle；
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
End heavy reduction.
The present invention relates to the Composition Control of steel grade has two difficult points, one is that single RH refines obtain super-low sulfur, and two is Mn contents
The control of sheet billet continuous casting process Mn segregation during ＞ 1.5%.
The present invention know-why be：
Super-low sulfur is obtained by way of ' KR desulfurization-converter dephosphorization-converter decarburizations-tapping wash heat ', it is to avoid refine work
Skill continues desulfurization, it is ensured that deoxidation productss Al2O3It is predominantly converted to Al2O3- CaS type field trashes, reduce Al2O3- CaO types are mingled with
Thing ratio, reduces the purpose for deteriorating uniform elongation field trash to reach.' KR desulfurization-converter dephosphorization-converter decarburizations-go out slag
Wash ' obtain super-low sulfur CCP pulling down desulfurization slag, reduce dephosphorized slag enter ladle, reduce decarbonized slag enter steel
Bag, less-slag melting, it is therefore intended that reduce upper link high sulphur slag and enter next link.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 try one's best less, size as far as possible little, drop
Low slab manganese segregation, reduction Center Equiaxial Crystal width, realize strip width banding the Uniform Control.
In order to be better understood from above-mentioned technical proposal, below in conjunction with description and specific embodiment 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 the restriction to technical solution of the present invention, in the case where not conflicting, 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 through KR desulfurization process, S content≤0.0010% after process, 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 process, under
The quantity of slag≤8kg/ ton steel；Desulfurization, dephosphorization, smelt through top and bottom combined blown converter decarburization after desiliconization, slide plate pushing off the slag before and after tapping process turns
Pre-melted slag is added to carry out wash heat desulfurization process, pre-melted slag addition 8kg/ in the quantity of slag≤5kg/ ton steel under stove, tapping process ladle
Ton steel；
Its composition is the pre-melted slag by mass percentage：SiO2≤ 5%, CaO：50%-56%, MgO≤5%, Al2O3：
29%-35%, Al：4%-6%, above-mentioned each component mass percent sum are 100%；Pre-melted slag addition 8kg/ ton steel.
Step b：Molten steel carries out RH vacuum refinings, carry out dehydrogenation, go to be mingled with, micro- Calcium treatment.RH vacuum refinings are arrived at a station molten steel
Composition S≤0.0015%, P≤0.012%, minimum vacuum degree ＜ 50Pa, vacuum time >=15min terminate H content ＜
0.0002%.Remaining stable Ca content≤0.0015% in steel after Calcium treatment, soft blow, Ca/S is than ＞ 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.
Composition 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 ferrum and inevitable trace impurity.
By the above as can be seen that smelting process is without LF stove desulfurization, by KR desulfurization-converter control sulfur-go out slag
Eluting sulfur, dephosphorization converter-decarburization converter smelting realize that fast pace, less-slag melting, converter tapping deoxidation productss are mainly Al2O3, then
In conjunction with micro- Calcium treatment after RH vacuum refinings, control slab field trash is changed into Al2O3Based on-CaS, Al is reduced2O3- CaO field trashes
Ratio, Al2O3The field trash deformation rate that-CaS is constituted is low, closer with the matrix coefficient of expansion, and the operation of rolling and expansion process are difficult
Broken crack source, and Al2O3The broken prolongation of the field trash operation of rolling that-CaO is constituted is in chain, causes after steel pipe expansion
Uniform elongation is low, reduces the purpose for deteriorating uniform elongation field trash so as to reach；By the casting of continuous casting low overheat, perseverance
Low pulling rate, dynamic soft-reduction, solidification end drafts account for the measure such as 50% of overall reduction reduces manganese segregation.
For a more detailed description to the present invention by the following examples.These embodiments are only to optimal embodiment party of the invention
The description of formula, does not have any restriction to the scope of the present invention.
Time production 6 stoves inflatable oil casing pipe steel is singly poured, using ' KR desulfurization → dephosphorization stove dephosphorization, desiliconization → converter take off
Carbon → RH vacuum refinings → continuous casting ' process route production.
As shown in table 1, RH vacuum refining process parameter is as shown in table 2, casting process for desulfurization-dephosphorization-decarbonizing process parameter
Parameter is as shown in table 3.Low power is done in first piece of the first stoves and last stove last block slab sampling for pouring times two streams respectively to comment
Level, low power rating result are as shown in table 4.All slabs are rolled into the strip steel of 8-12mm, take volume two per stove and do banding and be mingled with
Thing is graded, as a result as 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：For originally pouring time the first stove first block of slab of one stream, 1-2 is originally to pour time second-rate first block of slab of the first stove, 2- to 1-1
1 for originally pouring time last stove last block slab first-class, and 2-2 is originally to pour time last stove last block slab second-rate.
5 hot-strip quality classification of table
Note：1st, 2 ... 6 represent heat number, and a, b represent reel number.
The one or more technical schemes provided in the embodiment of the present invention, at least have the following technical effect that or advantage：
The smelting process of the Oil/gas Well expansion pipe steel provided in the embodiment of the present invention, by KR desulfurization, skims, dephosphorization stove
Dephosphorization, desiliconization, decarbonizing furnace decarburization realize that less-slag melting, smelting process time sulfur is few, and pushing off the slag before and after converter tapping, tapping wash heat are complete
Into desulfurization and control sulfur, ultra-low sulfur is obtained, it is to avoid refinery practice continues desulfurization, it is ensured that deoxidation productss Al2O3It is predominantly converted to
Al2O3- CaS type field trashes；RH refines terminate to carry out micro- Calcium treatment, so as 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 be not broken to crack source, reduces the purpose for deteriorating uniform elongation field trash so as to reach；By even
The measure of casting low overheat casting, permanent low casting speed control, dynamic soft-reduction and end heavy reduction, reduces slab manganese segregation, subtracts
Little Center Equiaxial Crystal width, realizes strip width banding the Uniform Control, obtains uniform prolonged expansion rate.
It should be noted last that, above specific embodiment only in order to technical scheme to be described and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, which all should be covered
In the middle of scope of the presently claimed invention.
Claims (10)
1. a kind of smelting process of Oil/gas Well expansion pipe steel, it is characterised in that comprise the following steps：
Step a, molten iron are fully skimmed after desulfurization through KR desulfurization process, and desulphurised hot metal is kept off after processing through dephosphorization converter dephosphorization, desiliconization
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 to carry out wash heat desulfurization process in process ladle；
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 big
Drafts.
2. the smelting process of Oil/gas Well expansion pipe steel as claimed in claim 1, it is characterised in that KR takes off in step a
After sulfur, 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, it is characterised in that desulfurization in step a
After molten iron is processed through dephosphorization converter dephosphorization, desiliconization, S content≤0.0020% in molten iron, P content≤0.035%, Si contents≤
0.05%, the lower quantity of slag≤8kg/ ton steel.
4. the smelting process of Oil/gas Well expansion pipe steel as claimed in claim 3, it is characterised in that tap in step a
Pushing off the slag before and after process, the lower quantity of slag≤5kg/ ton steel.
5. the smelting process of Oil/gas Well expansion pipe steel as claimed in claim 4, it is characterised in that fritting in step a
Its composition is slag by mass percentage：SiO2≤ 5%, CaO：50%-56%, MgO≤5%, Al2O3：29%-35%, Al：
4%-6%, above-mentioned each component mass percent sum are 100%；Pre-melted slag addition 8kg/ ton steel.
6. the smelting process of the Oil/gas Well expansion pipe steel as described in claim 1 or 5, it is characterised in that RH in step b
Refine is arrived at a station molten steel composition S≤0.0015%, P≤0.010%, minimum vacuum degree ＜ 50Pa, vacuum time >=15min, terminates H
Content ＜ 0.0002%.
7. the smelting process of Oil/gas Well expansion pipe steel as claimed in claim 6, it is characterised in that micro- calcium in step b
Process refers to Calcium treatment and soft blow, remaining stable Ca content≤0.0015% in steel after micro- Calcium treatment, and Ca/S is than ＞ 0.8.
8. the smelting process of the Oil/gas Well expansion pipe steel as described in claim 1 or 7, it is characterised in that in step c
Between 10-30 DEG C of bag low overheat, pulling rate 1.0-1.5m/min.
9. the smelting process of Oil/gas Well expansion pipe steel as claimed in claim 8, it is characterised in that according to continuous casting in step c
Model calculates three sections of drafts of solidification end, and overall reduction 3.0-4.0mm keeps end drafts to account for the 50% of overall reduction.
10. the smelting process of the Oil/gas Well expansion pipe steel as described in any claim in claim 1-9, its feature exist
In composition 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 are ferrum
With inevitable trace impurity.
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| CN107081412A (en) * | 2017-04-01 | 2017-08-22 | 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 |
| 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 |
| CN111876654A (en) * | 2020-07-01 | 2020-11-03 | 石横特钢集团有限公司 | Production method of low-temperature impact resistant blank for D-level power angle steel |
| CN113293253A (en) * | 2021-04-30 | 2021-08-24 | 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 |
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