CN102534430A - X90 steel pipe fitting and manufacture method thereof - Google Patents
X90 steel pipe fitting and manufacture method thereof Download PDFInfo
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- CN102534430A CN102534430A CN2012100531073A CN201210053107A CN102534430A CN 102534430 A CN102534430 A CN 102534430A CN 2012100531073 A CN2012100531073 A CN 2012100531073A CN 201210053107 A CN201210053107 A CN 201210053107A CN 102534430 A CN102534430 A CN 102534430A
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Abstract
The invention discloses an X90 steel pipe fitting and a manufacture method thereof, and belongs to the field of pipe fitting manufacture. The X90 steel pipe fitting comprises the following materials by weight percent: 0.06 to 0.10 percent of C, 0.1 to 0.3 percent of Si, 1.4 to 2.0 percent of Mn, 0 to 0.015 percent of P, 0 to 0.01 percent of S, 0.08 to 0.6 percent of Cr, 0.1 to 0.5 percent of Mo, 0 to 0.3 percent of Cu, 0.15 to 0.5 percent of Ni, 0.03 to 0.11 percent of Nb, 0 to 0.06 percent of Ti, 0.02 to 0.10 percent of V, and 0.17 to 0.25 percent of Pcm. The manufacture method comprises the following steps: taking a steel plate made of X90 steel as a raw material according to controlled rolling, reeling the steel plate into a cylinder, welding, hot-forming, quenching and tempering. The performance of the X90 steel-grade pipe fitting can fully meet the technical requirements on X90 steel pipe fittings, has high weldability, and can be used for conveying high-pressure petroleum or natural gas.
Description
Technical field
The present invention relates to a kind of X90 steel pipe fitting and method of manufacture thereof, belong to pipe fitting and make the field.
Background technology
Along with the demand of industry HS such as oil, Sweet natural gas, high pressure pipe-line construction development, various oil transportations, gas transmission line go into operation successively, and the requirement of conveying steel pipe is also improved constantly.Pipe-line construction will develop towards high grade of steel, big wall thickness direction, so that strengthen its transport capacity, reducing the construction costs.From now on, X90 grade of steel pipeline will very likely dominate the market, and in new pipe-line construction, occupy critical role.
X90 grade of steel pipe fitting product mainly adopts hot press forming technology and makes; At first be that roll of steel plate is processed cylinder and welding; Next cylinder is heated, cylinder is placed on suppresses in the mould then, treat behind the Workpiece shaping again to its heat-treat, machining etc.; Common X90 steel reduces because of heating, cooling cause performance in the compression moulding process, and weldability is relatively poor.Because intensity, the toughness reguirements of X90 grade of steel pipe fitting product are higher, in process of production, need repeatedly heat workpiece, must cause the variation of controlled rolling and controlled cooling steel plate tissue and the reduction of performance.Adopt integral quenching after the moulding, though can reduce the degree of degradation to a certain extent, because the restriction of the continuous space condition of heating and cooling, so effect can be very not remarkable, so need the steel plate composition is designed, moulding process carried out strictness control.
Summary of the invention
The technical problem that the present invention will solve provides a kind of X90 steel pipe fitting and method of manufacture thereof; X90 grade of steel pipe fitting ys, tensile strength that the present invention produced are bigger; The impelling strength MV of-30 ℃ of pipe fitting mother metal impelling strength MVs, weld seam and heat affected zones is higher; Performance can satisfy the technical requirements of X90 steel pipe fitting fully, and weldability is good, can be used as oil, the Sweet natural gas high-pressure delivery is used the X90 pipe fitting.Practiced thrift the cost of pipeline construction engineering.
The technical scheme that the present invention taked is: the X90 steel pipe fitting, and the mass percent of X90 steel consists of:
C 0.06～0.10%, and Si 0.1～0.3%, and Mn 1.4～2.0%, P≤0.015%; S≤0.01%, Cr 0.08～0.6%, and Mo 0.1～0.5%; Cu 0～0.3%, and Ni 0.15～0.5%, and Nb 0.03～0.11%; Ti 0～0.06%, and V 0.02～0.10%, control Pcm 0.17～0.25%.
The caliber of X90 steel pipe fitting is that 406～1422mm, wall thickness are 12～60mm.
The method of manufacture of X90 steel pipe fitting; Be that to adopt X90 steel controlled rolling steel plate be raw material, roll of steel plate is processed cylinder and welded, and then process through hot-forming, quenching and tempering; It is characterized in that; Hot-forming temperature is 850～950 ℃, and quenching temperature is 900～1050 ℃, and tempering temperature is 500～650 ℃.
In the composition of X90 steel of the present invention; Total alloy content of C and alloying element such as Mn, Mo, Ni, Cu, Nb etc. is pressed Pcm greater than 0.17%; Wherein C content must be greater than 0.06%; Guarantee that tube material has high hardening capacity, thereby guarantee that pipe fitting cooling back obtains bainite structure or bainite+martensitic stucture.In order to guarantee that pipe fitting body, weld seam and heat affected zone all have higher impact property, so suitably improve Ni content, reduce the low temperature brittleness transition temperature of steel, its Ni content can not be lower than 0.15%.But because the pipe fitting product when practice of construction, also need dock welding with pipeline steel tube, its weldability also is the key issue that pay attention to, and therefore, its total alloy content must be less than 0.25% by carbon equivalent Pcm, and wherein C content must be less than 0.10%.
Adopt the beneficial effect that technique scheme produced to be: the X90 grade of steel pipe fitting ys that the present invention produced is greater than 625MPa; Tensile strength is greater than 695Mpa;-30 ℃ of pipe fitting mother metal impelling strength MVs are greater than 60J; The impelling strength MV of weld seam and heat affected zone is greater than 50J, and performance can satisfy the technical requirements of X90 steel pipe fitting fully, can be used as oil, the Sweet natural gas high-pressure delivery is used the X90 pipe fitting.Practiced thrift the cost of pipeline construction engineering.
Embodiment
Embodiment 1
It is starting material that steel plate is pricked in the X90 grade of steel control of following table 1 chemical ingredients, adopts hot press forming technology to make X90 grade of steel pipe fitting product.
Table 1
58mm is thick, Ф 1219 * 1016mm reducer tee, and hot press forming technology is: 930 ± 20 ℃ of press temperatures, 1030 ± 10 ℃ of quenching temperatures, 580 ± 20 ℃ of tempering temperatures.Pipe fitting (threeway) performance test results such as following table 2:
Table 2
Embodiment 2
It is starting material that steel plate is pricked in the X90 grade of steel control of following table 3 chemical ingredientss, adopts hot press forming technology to make X90 grade of steel pipe fitting product.
Table 3
44mm is thick, Ф 1016 * 813mm reducer tee, and hot press forming technology is: 880 ± 20 ℃ of press temperatures, 960 ± 10 ℃ of quenching temperatures, 550 ± 20 ℃ of tempering temperatures.Pipe fitting (threeway) performance test results such as following table 4:
Table 4
Embodiment 3
It is starting material that steel plate is pricked in the X90 grade of steel control of following table 5 chemical ingredientss, adopts hot press forming technology to make X90 grade of steel pipe fitting product.
Table 5
30mm is thick, Ф 813 * 406.4mm reducer tee, and hot press forming technology is: 920 ± 20 ℃ of press temperatures, 1000 ± 10 ℃ of quenching temperatures, 580 ± 20 ℃ of tempering temperatures.Pipe fitting (elbow) performance test results such as following table 6:
Table 6
Embodiment 4
It is starting material that steel plate is pricked in the X90 grade of steel control of following table 7 chemical ingredientss, adopts hot press forming technology to make X90 grade of steel pipe fitting product.
Table 7
26mm is thick, Ф 406.4 * 406.4mm straight tee, and hot press forming technology is: 900 ± 20 ℃ of press temperatures, 980 ± 10 ℃ of quenching temperatures, 520 ± 20 ℃ of tempering temperatures.Pipe fitting (elbow) performance test results such as following table 8:
Table 8
Embodiment 5
It is starting material that steel plate is pricked in the X90 grade of steel control of following table 9 chemical ingredientss, adopts hot press forming technology to make X90 grade of steel pipe fitting product.
Table 9
12mm is thick, R=1.5D, 90 °, Ф 406.4mm elbow, and hot press forming technology is: 930 ± 20 ℃ of press temperatures, 1040 ± 10 ℃ of quenching temperatures, 640 ± 20 ℃ of tempering temperatures.Pipe fitting (elbow) performance test results such as following table 10:
Table 10
Claims (3)
1.X90 steel pipe fitting is characterized in that, the mass percent of X90 steel consists of:
C 0.06～0.10%, and Si 0.1～0.3%, and Mn 1.4～2.0%, P≤0.015%; S≤0.01%, Cr 0.08～0.6%, and Mo 0.1～0.5%; Cu 0～0.3%, and Ni 0.15～0.5%, and Nb 0.03～0.11%; Ti 0～0.06%, and V 0.02～0.10%, control Pcm 0.17～0.25%.
2. X90 steel pipe fitting as claimed in claim 1 is characterized in that, the caliber of pipe fitting is that 406～1422mm, wall thickness are 12～60mm.
3. according to claim 1 or claim 2 the method for manufacture of X90 steel pipe fitting; Be that to adopt X90 steel controlled rolling steel plate be raw material, roll of steel plate is processed cylinder and welded, and then process through hot-forming, quenching and tempering; It is characterized in that; Hot-forming temperature is 850～950 ℃, and quenching temperature is 900～1050 ℃, and tempering temperature is 500～650 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100531073A CN102534430A (en) | 2012-03-02 | 2012-03-02 | X90 steel pipe fitting and manufacture method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100531073A CN102534430A (en) | 2012-03-02 | 2012-03-02 | X90 steel pipe fitting and manufacture method thereof |
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| CN102534430A true CN102534430A (en) | 2012-07-04 |
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| CN2012100531073A Pending CN102534430A (en) | 2012-03-02 | 2012-03-02 | X90 steel pipe fitting and manufacture method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266278A (en) * | 2013-05-07 | 2013-08-28 | 舞阳钢铁有限责任公司 | Quenching and tempering type pipe line steel plate and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163807A (en) * | 2005-03-17 | 2008-04-16 | 住友金属工业株式会社 | High tension steel plate, welded steel pipe and method for production thereof |
| CN101287853A (en) * | 2005-08-22 | 2008-10-15 | 住友金属工业株式会社 | Seamless steel pipe for line pipe and method for producing same |
| CN102046829A (en) * | 2008-05-26 | 2011-05-04 | 新日本制铁株式会社 | High-strength hot-rolled steel sheet for line pipe excellent in low-temperature toughness and ductile-fracture-stopping performance and process for producing the same |
-
2012
- 2012-03-02 CN CN2012100531073A patent/CN102534430A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163807A (en) * | 2005-03-17 | 2008-04-16 | 住友金属工业株式会社 | High tension steel plate, welded steel pipe and method for production thereof |
| CN101287853A (en) * | 2005-08-22 | 2008-10-15 | 住友金属工业株式会社 | Seamless steel pipe for line pipe and method for producing same |
| CN102046829A (en) * | 2008-05-26 | 2011-05-04 | 新日本制铁株式会社 | High-strength hot-rolled steel sheet for line pipe excellent in low-temperature toughness and ductile-fracture-stopping performance and process for producing the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266278A (en) * | 2013-05-07 | 2013-08-28 | 舞阳钢铁有限责任公司 | Quenching and tempering type pipe line steel plate and production method thereof |
| CN103266278B (en) * | 2013-05-07 | 2015-06-17 | 舞阳钢铁有限责任公司 | Quenching and tempering type pipe line steel plate and production method thereof |
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Application publication date: 20120704 |