CN101054650A - Steel for large diameter non-tempering petroleum sleeve - Google Patents
Steel for large diameter non-tempering petroleum sleeve Download PDFInfo
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- CN101054650A CN101054650A CN 200710048766 CN200710048766A CN101054650A CN 101054650 A CN101054650 A CN 101054650A CN 200710048766 CN200710048766 CN 200710048766 CN 200710048766 A CN200710048766 A CN 200710048766A CN 101054650 A CN101054650 A CN 101054650A
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Abstract
The invention discloses a big-caliber non-tempered and quenched steel for oil bushing. The steel is composed of the following components in percentage: C 0.38-0.45%, Si 0.40-0.60%, Mn 1.50-1.70%, V 0.08-0.12%, Nb 0.03-0.05% and Ti 0.01-0.15%. The beneficial effects of the invention reside in adding in combination in Nb, V and Ti which have strong crystal granules precipitation, strengthening and refining ability and improve the strength, roughness and rigidity of the steel and adding in Al as alloying element and deoxidization element which satisfies the demand of high rigidity and impact roughness for producing big-caliber non-tempered and quenched steel for oil bushing.
Description
Technical field
The present invention relates to oil casing pipe steel, particularly a kind of steel for large diameter non-tempering petroleum sleeve.
Background technology
Middle carbon microalloy pearlitic steel is to add micro alloying element in medium carbon steel and medium carbon manganese steel, by the process means of controlled rolling and controlled cooling, makes its precipitation strength and crystal grain thinning and improves intensity, hardness and toughness, reaches the performance level of quenched and tempered steel.Because of having omitted the modifier treatment operation, this novel steel grade is compared with quenched and tempered steel, can make total manufacturing cost reduce more than 15%.Therefore, develop economic environment-friendly type new steel grade that can satisfy the demand without modifier treatment, that obdurability is good after the hot rolling, have important in theory meaning and actual application value.
At present, the production of non-tempering petroleum casing steel is normally added micro alloying element in medium carbon steel and medium carbon manganese steel, but often only adds a kind of micro alloying element.Normally add V, improving the intensity of its online normalizing, as steel grade 35Mn2V, 38Mn6V, 33Mn2V, 36Mn2V, 42MnMo7,34Mn2VN, 42Mn2V and the 37Mn2V etc. of the microalloy non-quenched and tempered N 80 level petroleum casing pipe of domestic-developed.Owing to only add a kind of micro alloying element, the raising of steel grade impelling strength is limited, so these steel grades can not satisfy in producing large diameter non-tempering petroleum sleeve pipe process the requirement that high strength and impelling strength are complementary.
Summary of the invention
Technical problem to be solved by this invention provides a kind of steel for large diameter non-tempering petroleum sleeve, and this steel grade can satisfy in producing large diameter non-tempering petroleum sleeve pipe process the requirement that high strength and impelling strength are complementary preferably.
The technical solution adopted for the present invention to solve the technical problems is: steel for large diameter non-tempering petroleum sleeve of the present invention is characterized in that: this steel contains by weight percentage: C 0.38～0.45%, Si 0.40～0.60%, Mn 1.50～1.70%, V 0.08～0.12%, Nb 0.03～0.05%, Ti 0.01～0.15%.
As a preferred embodiment of the present invention, this steel is made up of following ingredients by weight percentage: C0.38～0.45%, Si 0.40～0.60%, Mn 1.50～1.70%, V 0.08～0.12%, Nb0.03～0.05%, Ti 0.01～0.15%, Al 0.02～0.05%, all the other are Fe and impurity.
In above-mentioned preferred version, P in the described impurity≤0.025, S≤0.020.
In above-mentioned preferred version, the carbon equivalent Ceq. of this steel (%) is 0.66～0.75%, carbon equivalent Ceq.=C+Mn/6+V/5.
The invention has the beneficial effects as follows, unite and add ability Nb, V, Ti with stronger precipitation strength and crystal grain thinning, improve intensity, hardness and the toughness of steel grade, and Al introduced as alloy element and deoxidant element, can satisfy in producing large diameter non-tempering petroleum sleeve pipe process the requirement that high strength and impelling strength are complementary preferably.
Description of drawings
This specification sheets comprises following four width of cloth accompanying drawings:
Fig. 1 is the metallographic structure figure of steel for large diameter non-tempering petroleum sleeve of the present invention;
Fig. 2 is the metallographic structure figure of steel for large diameter non-tempering petroleum sleeve of the present invention;
Fig. 3 is the division and the numbering synoptic diagram of steel for large diameter non-tempering petroleum sleeve pulling force sample of the present invention;
Fig. 4 is a steel for large diameter non-tempering petroleum sleeve pulling force sample detected result graphic representation of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Steel for large diameter non-tempering petroleum sleeve of the present invention is characterized in that: this steel contains by weight percentage: C 0.38～0.45%, Si 0.40～0.60%, Mn 1.50～1.70%, V 0.08～0.12%, Nb 0.03～0.05%, Ti 0.01～0.15%.
Because Nb, V, Ti have the stronger precipitation strength and the ability of crystal grain thinning, unite the effective of a kind of micro alloying element of the more single adding of the effect that adds multiple micro alloying element, can obtain perlite+ferrite metallographic structure, its Medium pearlite percentage composition reaches 80～90%, so can improve intensity, hardness and the toughness of steel grade, make it to satisfy preferably in producing large diameter non-tempering petroleum sleeve pipe process the requirement that high strength and impelling strength are complementary.
Referring to Fig. 1 and Fig. 2, metallographic structure is ferrite+perlite, and crystal grain tiny (10.0 grades of grain fineness numbers), and homogeneous microstructure satisfy the non-hardened and tempered steel performance requriements fully.
As a preferred embodiment of the present invention, this steel is made up of following ingredients by weight percentage: C0.38～0.45%, Si 0.40～0.60%, Mn 1.50～1.70%, V 0.08～0.12%, Nb0.03～0.05%, Ti 0.01～0.15%, Al 0.02～0.05%, all the other are Fe and impurity, be Al not only as deoxidant element, and add in the steel with alloy element.
In above-mentioned preferred version, P in the described impurity≤0.025, S≤0.020.
In above-mentioned preferred version, the carbon equivalent Ceq. of this steel (%) is 0.66～0.75%, carbon equivalent Ceq.=C+Mn/6+V/5.
Al is as alloying element, and its content is controlled in strictness.
Embodiment:
1. smelting composition
Each embodiment smelts composition such as following table:
| Heat (batch) number | C | Si | Mn | V | Nb | Ti | Al | P | S |
| 0683613 | 0.38 | 0.35 | 1.68 | 0.12 | 0.031 | 0.014 | 0.044 | 0.018 | 0.012 |
| 0683634 | 0.40 | 0.42 | 1.62 | 0.10 | 0.037 | 0.025 | 0.030 | 0.016 | 0.011 |
| 0683636 | 0.44 | 0.57 | 1.52 | 0.082 | 0.049 | 0.045 | 0.022 | 0.017 | 0.010 |
2. smelting operation
In steel-making, casting process, operation, Working Procedure Controlling are carried out in strict accordance with standard, make the chemical ingredients of steel even, to guarantee the performance of steel pipe.
The T[O of strand] amount: 20～35PPm, casting blank foreign matter total amount: 80～110PPm.
Steel pipe finished product chemical ingredients permissible variation meets the regulation of table 2 among the GB/T 222.1984.
3. steel pipe rolling
In the operation of rolling, rationally formulate various processing parameters such as rolling rhythm, hollow forging charging temperature, hollow forging tapping temperature, reheating furnace stepping period, speed of cooling, to satisfy its performance index.Main processing parameter is as follows:
The ring furnace furnace temperature must guarantee the steel temperature of coming out of the stove: 1230 ± 20 ℃;
Adopt online normalizing process, go into 500～600 ℃ of walking-beam furnace steel temperature;
The walking-beam furnace furnace temperature must guarantee the steel temperature of coming out of the stove: 920 ± 20 ℃;
Rolling rhythm: Φ 244.5 〉=60 seconds, Φ 339.7 〉=70 seconds, walking-beam furnace is by the tooth cloth; Adopt cooling fast behind the sizing.
4. steel tube performance detects
Steel tube performance detected result such as following table:
| Heat (batch) number | Lot number | Surrender (Mpa) | Tension (Mpa) | Extend (%) | 0 ℃ of impact (J) 1 | 0 ℃ of impact (J) 2 | 0 ℃ of impact (J) 3 | 0 ℃ of average (J) |
| 0683613 | Y326110213A | 650 | 895 | 29 | 20 | 20 | 19 | 20 |
| Y326110213B | 645 | 880 | 28 | 23 | 23 | 24 | 23 | |
| 0683634 | Y326110215A | 635 | 880 | 28 | 20 | 20 | 23 | 21 |
| Y326110215B | 620 | 865 | 28 | 21 | 23 | 22 | 22 | |
| 0683636 | Y326110219A | 640 | 875 | 30 | 22 | 21 | 20 | 21 |
| Y326110219B | 635 | 860 | 30 | 24 | 22 | 20 | 22 |
5, along steel pipe circumferential direction Performance Detection
For detecting steel pipe performance variation situation along the circumferential direction, 300mm long tube ring is got in the pup joint end, by 16 pulling force samples, the number consecutively of getting shown in Figure 3.
Detected result as shown in Figure 4, except that No. 3 samples more unusually, the curve that all the other 15 samples are formed is more smooth, illustrates that the steel pipe radial performance is more even.
Claims (4)
1. steel for large diameter non-tempering petroleum sleeve, it is characterized in that: this steel contains by weight percentage: C 0.38～0.45%, Si 0.40～0.60%, Mn 1.50～1.70%, V 0.08～0.12%, Nb 0.03～0.05%, Ti 0.01～0.15%.
2. steel for large diameter non-tempering petroleum sleeve as claimed in claim 1, it is characterized in that: this steel is made up of following ingredients by weight percentage: C 0.38～0.45%, Si 0.40～0.60%, Mn1.50～1.70%, V 0.08～0.12%, Nb 0.03～0.05%, Ti 0.01～0.15%, Al0.02～0.05%, all the other are Fe and impurity.
3. steel for large diameter non-tempering petroleum sleeve as claimed in claim 2 is characterized in that: P in the described impurity≤0.025, S≤0.020.
4. steel for large diameter non-tempering petroleum sleeve as claimed in claim 2 is characterized in that: the carbon equivalent Ceq. of this steel (%) is 0.66～0.75%, Ceq.=C+Mn/6+V/5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100487667A CN100500918C (en) | 2007-03-29 | 2007-03-29 | Steel for large diameter non-tempering petroleum sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100487667A CN100500918C (en) | 2007-03-29 | 2007-03-29 | Steel for large diameter non-tempering petroleum sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN101054650A true CN101054650A (en) | 2007-10-17 |
| CN100500918C CN100500918C (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100487667A Expired - Fee Related CN100500918C (en) | 2007-03-29 | 2007-03-29 | Steel for large diameter non-tempering petroleum sleeve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745731B (en) * | 2009-12-23 | 2012-06-13 | 中国海洋石油总公司 | Method for producing N80 ERW oil well casing |
| CN103695793A (en) * | 2013-12-17 | 2014-04-02 | 西宁特殊钢股份有限公司 | Large-sized non-quenched and tempered steel and smelting method thereof |
| CN105603313A (en) * | 2016-01-25 | 2016-05-25 | 宝山钢铁股份有限公司 | Steel for petroleum casing pipe with low yield ratio, manufacturing method of steel and production method of casing pipe |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038467A (en) * | 1988-06-16 | 1990-01-03 | 冶金工业部攀枝花钢铁公司钢铁研究院 | High-strength and high ductility non-quenched and non-tempesed steel |
| JP3241897B2 (en) * | 1993-10-12 | 2001-12-25 | 新日本製鐵株式会社 | Non-heat treated steel for hot forging with excellent tensile strength, fatigue strength and machinability |
-
2007
- 2007-03-29 CN CNB2007100487667A patent/CN100500918C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745731B (en) * | 2009-12-23 | 2012-06-13 | 中国海洋石油总公司 | Method for producing N80 ERW oil well casing |
| CN103695793A (en) * | 2013-12-17 | 2014-04-02 | 西宁特殊钢股份有限公司 | Large-sized non-quenched and tempered steel and smelting method thereof |
| CN103695793B (en) * | 2013-12-17 | 2015-05-27 | 西宁特殊钢股份有限公司 | Large-sized non-quenched and tempered steel and smelting method thereof |
| CN105603313A (en) * | 2016-01-25 | 2016-05-25 | 宝山钢铁股份有限公司 | Steel for petroleum casing pipe with low yield ratio, manufacturing method of steel and production method of casing pipe |
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| Publication number | Publication date |
|---|---|
| CN100500918C (en) | 2009-06-17 |
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Assignee: Pangang Group Chengdu steel vanadium Co., Ltd. Assignor: Pangang Group Chengdu Iron & Steel Co., Ltd Contract fulfillment period: 2009.11.24 to 2015.11.24 contract change Contract record no.: 2009510000174 Denomination of invention: Steel for large diameter non-tempering petroleum sleeve Granted publication date: 20090617 License type: Exclusive license Record date: 20091130 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.11.24 TO 2015.11.24; CHANGE OF CONTRACT Name of requester: PANGANG GROUP CHENGDU STEEL + VANADIUM CO., LTD. Effective date: 20091130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090617 Termination date: 20160329 |