CN108296461A - Oil casing pipe steel J55 steel-making continuous casting production methods - Google Patents
Oil casing pipe steel J55 steel-making continuous casting production methods Download PDFInfo
- Publication number
- CN108296461A CN108296461A CN201810050093.7A CN201810050093A CN108296461A CN 108296461 A CN108296461 A CN 108296461A CN 201810050093 A CN201810050093 A CN 201810050093A CN 108296461 A CN108296461 A CN 108296461A
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- China
- Prior art keywords
- steel
- continuous casting
- casting
- strand
- casing pipe
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Classifications
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
-
- 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
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Abstract
The invention discloses a kind of oil casing pipe steel J55 steel-making continuous casting production methods, have the following steps：(1) it improves molten steel clarity to pre-process by molten iron in steelmaking process, molten steel furnace external refining；(2) pulling speed of continuous casting is controlled, permanent casting speed control is in 1.1m/min；(3) pouring temperature is controlled, the pouring temperature of J55 steel is 1518 °C, and the degree of superheat controls within 25 °C；(4) optimize continuous casting two cold system, using secondary strong cold system, cooling specific water is 1.2 kilograms of steel/liter water；(5) soft reduction technique is used, mechanical pressure is applied to the strand shell of pull-out, cylinder pressure 20MPa uses soft reduction technique when casting the second stove steel.The STEELMAKING PRODUCTION method of the present invention can promote strand center solidified structure Equiaxed grain crystallization, reduce and be easy to segregation element amount in molten steel, control casting blank bulging amount, improve the center segregation of J55 strands.
Description
Technical field
The invention belongs to steel-making continuous casting technical field, especially a kind of oil casing pipe steel J55 steel-making continuous casting production methods.
Background technology
Petroleum casing pipe is the important equipment of oil drilling, main equipment further include drilling rod, basket and casing, drill collar and
Slim hole drilling steel pipe etc..
J55 has strict requirements for the chemical composition of steel, degree of purity, mechanical property, metallographic structure etc..Center segregation
It is most common gross imperfection in continuous casting billet, this defect is difficult to eliminate by subsequent rolling or annealing.Center is inclined
Analysis can influence the mechanical performance and processing performance of J55 final products.Therefore, continuous casting billet center segregation is mitigated or eliminated to improving
J55 performances are of great significance.
The principle analysis that is generated from center segregation it is found that equiaxial crystal ratio, bulge amount be influence two of center segregation it is important
Factor, therefore, by increase equiaxial crystal ratio, reduce bulge amount, can effectively improve the center segregation degree of strand.
1, the influence of Molten Steel Cleanliness
P, S component content are higher in steel, and the qualification rate of center segregation of casting blank reduces accordingly.
To 1.1 m/min of J55 steel grades pulling rate in database of sulphur printing, 1 450 mm of width, 25 DEG C of the degree of superheat, S% 0.
006, the sufur printing base sample of the identical type of cooling is counted.Sample size is 44, qualified samples 35, qualification rate 79.55%；
To 1.1 m/min of J55 steel grades pulling rate in database of sulphur printing, 1 450 mm of width, the degree of superheat is 25 DEG C, 0.01%≤w (P)≤
0.015%, the sufur printing base sample of the identical type of cooling is for statistical analysis.Sample size is 77, qualified samples 64, qualification rate
83.12%.
2, the influence of pulling rate
Pulling rate has center segregation of casting blank critically important influence, this is because for J55, when pulling rate increases, reduces
Residence time of the molten steel in crystallizer, lead to shift molten steel and spend the heat required time and increase, it is isometric to have postponed center
Brilliant production is conducive to column crystal development and axial segregation；Simultaneously when pulling rate often changes, roller bending, casting blank bulging amount
Recovery time be longer than the transformation period of pulling rate, to make casting blank bulging amount increase, be conducive to the formation of center segregation.Statistics
The rule that the ratio that the above center segregation of B classes occurs changes with pulling rate.Database of sulphur printing is integrally counted, sample size is
318, center segregation A classes 3, B classes 232, C classes 83, proportion is respectively 0.9%, 73.0%, 26.1%.B classes
73.9% is accounted for above.
3, the influence of the degree of superheat
The degree of superheat is to influence one of the key factor of isometric crystalline region area.When the degree of superheat is high, the width of column crystal band increases, even
Column crystal bridging phenomenon is generated, to form center porosity；When the degree of superheat is low, it is capable of providing a large amount of isometric nucleus, generate etc.
Axialite network, prevents the formation of solidification column crystal early period, and generates the isometric crystalline region of large area of fine isometric crystal grains composition；But
The degree of superheat is too low, is unfavorable for the floating of inclusion content in melting steel, while easy ting produce low temperature dross accident.To J55 strand sufur printing numbers
It being counted according to library, pulling rate is 1.1 m/min, and strand size is the mm of 1 450 mm × 230, under identical cooling condition, strand
Sample size is 99, and wherein A classes are segregated 2, and B classes are segregated 76, and C classes 21, proportion is followed successively by：2.0%, 76.
8%, 21.2%, 78.8% is accounted for altogether than heavier A class B classes segregation.Qualified samples (0.5 grade of B classes or less) 79 in sample
It is a, qualification rate 79.8%.
4, the influence of intensity of secondary cooling
Two it is cold be the cooling system carried out with wick-containing strand to leaving crystallizer, in order to so that strand is solidified and is controlled completely
Casting blank surface temperature uniformly declines in throwing direction.When intensity of secondary cooling is too small, casting blank surface temperature will be excessively high, and strand wick-containing adds
Long, isometric crystalline region expands, and green shell hinders the bulge deformation reduced capability caused by ferrostatic pressure, to promote center segregation
It is formed and is extended.But intensity of secondary cooling crosses conference and keeps the cooling of strand outside too strong, leads to strand crackle.
Invention content
The purpose of the present invention is to provide a kind of oil casing pipe steel J55 steel-making continuous casting production methods, steel-making of the invention
Production method can promote strand center solidified structure Equiaxed grain crystallization, reduce and be easy to segregation element amount in molten steel, control strand drum
Tolerance improves the center segregation of J55 strands.
The object of the present invention is achieved like this：A kind of oil casing pipe steel J55 steel-making continuous casting production methods, have as follows
Step：(1) it improves molten steel clarity to pre-process by molten iron in steelmaking process, molten steel furnace external refining contains S in J55 steel
Within 0.035%, P content controls within 0.014% for amount control；(2) pulling speed of continuous casting is controlled, permanent casting speed control is in 1.1m/
min；(3) pouring temperature is controlled, the pouring temperature of J55 steel is 1518 °C, and the degree of superheat controls within 25 °C；(4) optimize continuous casting
Secondary cooling system, it is 1.2 kilograms of steel/liter water that secondary strong cold system, cooling specific water are used in continuous casting；(5) slighter compress is used
Technology applies mechanical pressure, cylinder pressure 20MPa, when casting the second stove steel, to pull-out to the strand shell of pull-out
Strand shell uses soft reduction technique.
The effect of invention：
1）Casting blank section equiaxial crystal ratio and control casting blank bulging amount are improved, J55 continuous casting billet center segregations can be mitigated.
2）J55 continuous casting billet S contents are controlled in 0.035%, P content within 0.014%, casting speed control is in permanent pulling rate 1.1m/
Min, the degree of superheat controls within 20 DEG C and secondary hardening cooling technology, is effectively improved the center segregation of strand.
The scope of application and application prospect of invention：
This method is suitable for same type steel-making enterprise, to the petroleum casing pipe because of caused by secondary cooling technique and continuous casting installation for casting problem
With the analysis of the internal soundness problem of steel J55 continuous casting billets, the measure for taking optimize technique and improving equipment makes petroleum casing pipe use
The internal flaw rate of steel J55 continuous casting billets is reduced to reduced levels, improves the quality of oil casing pipe steel J55 continuous casting billets.
The STEELMAKING PRODUCTION method of the present invention, realizes and promotes strand center solidified structure Equiaxed grain crystallization, reduce in molten steel
It is easy to segregation element amount, controls casting blank bulging amount, improve the center segregation of J55 strands.
Specific implementation mode
The technical solution further illustrated the present invention below by specific implementation mode
Embodiment 1：
A kind of oil casing pipe steel J55 steel-making continuous casting production methods have the following steps：
1, molten steel clarity is improved
In making steel actual production process, pre-processed by molten iron, molten steel furnace external refining technology by S contents in J55 be 0.030%,
P content is that can mitigate the center segregation of continuous casting billet to a certain extent within 0.012%.
2, pulling speed of continuous casting is controlled
In continuous casting actual production process, different casting corresponding center segregation of casting blank situation analysis when by cast J55 is permanent
Casting speed control can mitigate the center segregation of strand in 1.1m/min.
3, pouring temperature is controlled
Pouring temperature is to influence one of the important element of column crystals growth.Pouring temperature is high, and strand column crystal is flourishing.In continuous casting reality
In the production process of border, the difference degree of superheat corresponding center segregation of casting blank situation analysis when by cast J55, the degree of superheat 15
DEG C, the center segregation of strand can be mitigated.
4, optimize continuous casting two cold system
Secondary Cooling can reduce the bulge of green shell in process of setting, to avoid causing the enrichment of segregation element, improve
The surface quality and internal soundness of strand, reduce the center segregation of strand.Secondary strong cold system is used in continuous casting J55,
Its specific water is 1.2 kilograms of steel/liter water.
5, using soft reduction technique
During soft reduction technique generates defect when acting directly on solidification, have to strand centre main function:1）It is logical
Application mechanical force is crossed, cylinder pressure increases to 20MPa pressure by the pressure of former 12Mpa, and the equiax crystal " put up a bridge " is broken,
Changing the solidification process of period appearance " small steel ingot " structure so that the liquid of strand upper end be free to add lower end, from
And compensate due to volume contraction caused by liquid, solid two-phase density contrast, reduce center segregation degree；2）In view of original of expanding with heat and contract with cold
It manages, since strand bulk temperature declines in casting process, volume contraction can be led to, since the cooling condition of strand each section is difficult
It is that last solidification zone may form negative pressure in strand, and molten steel of the suction rich in solute leads to the generation of center segregation, by applying
Add correct deformation force, the deformation rate of strand is allow to compensate cooling meat rate, can effectively mitigate center segregation degree.
Claims (1)
1. a kind of oil casing pipe steel J55 steel-making continuous casting production methods, characterized in that have the following steps：
(1) it improves molten steel clarity to pre-process by molten iron in steelmaking process, molten steel furnace external refining, by S contents in J55 steel
Within 0.035%, P content controls within 0.014% for control；
(2) pulling speed of continuous casting is controlled, permanent casting speed control is in 1.1m/min；
(3) pouring temperature is controlled, the pouring temperature of J55 steel is 1518 °C, and the degree of superheat controls within 25 °C；
(4) optimize continuous casting two cold system, in continuous casting using secondary strong cold system, cooling specific water for 1.2 kilograms of steel/liter
Water；
(5) soft reduction technique is used, mechanical pressure applied to the strand shell of pull-out, cylinder pressure 20MPa, in casting the
When two stove steel, soft reduction technique is used to the strand shell of pull-out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050093.7A CN108296461A (en) | 2018-01-18 | 2018-01-18 | Oil casing pipe steel J55 steel-making continuous casting production methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050093.7A CN108296461A (en) | 2018-01-18 | 2018-01-18 | Oil casing pipe steel J55 steel-making continuous casting production methods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108296461A true CN108296461A (en) | 2018-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810050093.7A Pending CN108296461A (en) | 2018-01-18 | 2018-01-18 | Oil casing pipe steel J55 steel-making continuous casting production methods |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010925A (en) * | 2010-05-11 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting novel medium carbon J55 steel |
| CN102912230A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | 690MPa-grade electric resistance welding petroleum sleeve and manufacture method thereof |
| CN103572165A (en) * | 2012-05-23 | 2014-02-12 | 莱芜钢铁集团有限公司 | Steel for petroleum sleeve connecting piece and production method of steel |
-
2018
- 2018-01-18 CN CN201810050093.7A patent/CN108296461A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010925A (en) * | 2010-05-11 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting novel medium carbon J55 steel |
| CN103572165A (en) * | 2012-05-23 | 2014-02-12 | 莱芜钢铁集团有限公司 | Steel for petroleum sleeve connecting piece and production method of steel |
| CN102912230A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | 690MPa-grade electric resistance welding petroleum sleeve and manufacture method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 吾塔等: "J55石油套管钢生产过程纯净度控制的探讨", 《新疆钢铁》 * |
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Application publication date: 20180720 |