CN102154593B - X80 steel grade anti-corrosion low-temperature seamless line pipe - Google Patents
X80 steel grade anti-corrosion low-temperature seamless line pipe Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 12
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 9
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- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
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- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
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- 238000003466 welding Methods 0.000 abstract description 8
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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Abstract
The invention provides an X80 steel grade anti-corrosion low-temperature seamless line pipe which comprises the following components in percentage by weight: 0.08 to 0.14 percent of C, 0.20 to 0.35 percent of Si, 1.10 to 1.40 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.20 percent of Mo, 0.020 to 0.060 percent of Al, 0.02 to 0.05 percent of Nb, 0.05 to 0.10 percent of V, 0.10 to 0.20 percent of Cu, 0.10 to 0.20 percent of Ni, less than or equal to 0.015 percent of Ti, less than or equal to 0.15 percent of Cr, 0.0015 to 0.0060 percent of Ca, less than or equal to 0.0005 percent of B, less than or equal to 0.012 percent of N, less than or equal to 0.43 percent of CEV, less than or equal to 0.23 percent of Pcm and trace amount of ferrum and impurity elements. The line pipe has the rigidity of less than or equal to 250 HV10 and grain size of more than or equal to 8 levels, and passes tests of hydrogen induced cracking (HIC) and sulfide stress corrosion (SSC) corrosion tests at the ductile-brittle transition temperature of below -60 DEG C. The line pipe has the advantages that the integral tissue of a pipe body is uniform, the equivalent carbon content is less than the that of the requirement of the American petroleum institute (API) 5L standard, the welding performance is high, the low-temperature toughness and anti-corrosion performance are excellent, the cost is low, and the requirement of users on the X80 steel grade seamless line pipe can be met completely.
Description
Technical field
The invention belongs to the weldless steel tube manufacturing technology of metallurgical industry, relate to a kind of X80 steel-grade anti-corrosion low-temperature seamless line pipe.
Background technology
Pipeline transportation is the mode of movement of the large and economic oil of a kind of scale, Sweet natural gas, can not only transfer oil, Sweet natural gas, also can be used as the significant transportation means of coal and other solid matter.The four large natural gas fields of China (sweet peaceful, Qaidam, Qinghai, Shan, Tarim Basin, South Sinkiang, Chongqing of Sichuan) resource is away from the consumption market, so build high pressure length apart from line of pipes be solve over a long time, the major measure of extensive transport natural gas, and China will seek abroad from now on oily resource and be delivered to domestic by sea-freight or pipeline.Worldwide pipe line steel grade of steel be along with the raising of transfer pressure to high grade of steel development.By adopting the high Grade can the riser tubing transfer pressure, improve transport efficiency and attenuate pipeline wall thickness, correspondingly reduce welding material consumption, thereby save the investment of building line of pipes.
The development of the progress of metallurgical technology and microalloying pipe line steel, make produce have high strength, high tenacity, good welds pipe line steel become a reality, and mainly concentrates at present on X65, two grade of steels of X70, X80 is the newer grade of steel of development in recent years.Adopt modifier treatment, because the restriction of the carbon equivalent of pipe line steel, satisfy high grade of steel, good welding property but has great difficulty.The patent that manufactures and designs the aspect for the high grade of steel pipeline of API 5L has X80 at present, the X100 grade of steel, but these patents all are for welded tube, and also do not have for the pipeline patent of weldless steel tube X80 steel-grade.Along with the pipeline transfer pressure towards high pressure development with reduce the trend of investment, also can increase gradually the demand of X80 steel-grade weldless steel tube, particularly have the weldless steel tube of anti-corrosion low-temperature performance.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide a kind of X80 steel-grade anti-corrosion low-temperature seamless line pipe that is applicable to, satisfying the market is to the needs of X80 steel-grade weldless steel tube.Can reach the X80 steel-grade performance of API 5L regulation by the seamless line pipe of the method manufacturing, and have good anticorrosive and low-temperature performance.
For achieving the above object, technical solution of the present invention provides a kind of X80 steel-grade anti-corrosion low-temperature seamless line pipe, and the weight proportion of the steel grade component of this line pipe is:
C:0.08～0.14%, Si:0.20～0.35%, Mn:1.10～1.40%, P≤0.015%, S≤0.005%, Mo:0.10～0.20%, Al:0.020～0.060%, Nb:0.02～0.05%, V:0.05～0.10%, Cu:0.10～0.20%, Ni:0.10～0.20%, Ti :≤0.015%, Cr :≤0.15%, Ca:0.0015～0.0060%, B :≤0.0005%, N :≤0.012%, CEV≤0.43%, Pcm≤0.23%, all the other are iron, the impurity element trace;
The performance of X80 steel-grade anti-corrosion low-temperature seamless line pipe:
Yield strength 555～705MPa, tensile strength 625～825MPa, yield tensile ratio≤0.92, unit elongation 〉=20%, the summer is than V-type-46 ℃ horizontal full-scale ballistic work 〉=100J, single shear area 〉=80%, on average 〉=90%, ductile-brittle transition temperature is below-60 ℃, hardness≤250HV10, grain fineness number 〉=8 grade are by HIC and SSC corrosion test.
The invention has the beneficial effects as follows: this X80 steel-grade anti-corrosion low-temperature seamless line pipe adopts the micro-alloyed steel design, is fit to the production of X80 steel-grade anti-corrosion low-temperature seamless line pipe, and the body global tissue is even, is uniform tempering bainite+ferrite (B
Return+ F) to organize, grain fineness number is tiny; Carbon equivalent is low, and welding property is good; Special add 0.10～0.20% Cu and Ni, so that the usage quantity that this steel grade is saved microalloy element Cr and Mo when having good anticorrosive and low-temperature performance, the reduction cost can satisfy the requirement of X80 steel-grade seamless line pipe fully.Compare X80 steel-grade line pipe name SMYS with X70 grade of steel line pipe and improve 14.4%, nominal minimum tensile strength improves 9.6%, and impelling strength does not descend, and has reached good combination of strength and toughness.The ductile-brittle transition temperature of this steel grade is less than-60 ℃, and low-temperature flexibility is good, particularly can be by being strict in the corrosion test of 44 editions requirements of API 5L.Adopt the X80 steel-grade pipeline steel tube can the riser tubing transfer pressure, improve transport efficiency and attenuate pipeline wall thickness, reduce welding material consumption, save the investment of building line of pipes.Use this steel grade to produce the X80 steel-grade seamless line pipe and can satisfy the user to the requirement of high steel grade anti-corrosion low-temperature seamless line pipe.
Description of drawings
Fig. 1 is Φ 323.80 * 20.00mm X80 seamless line pipe of the present invention center 500X metallograph;
Fig. 2 is tough-brittle transition curve of the present invention.
Embodiment
Reaching by reference to the accompanying drawings embodiment is illustrated X80 steel-grade anti-corrosion low-temperature seamless line pipe of the present invention.
In the X80 steel-grade anti-corrosion low-temperature seamless line pipe of the present invention the chief component composition being chosen reason is analyzed as follows:
Carbon: most economical, the most basic strengthening element in the steel, the effect by solution strengthening and precipitation strength has obvious effect to the intensity that improves steel, has advantages of that cost is low, regulation and control susceptibility is good.But the shortcoming that content is higher also to have welding property, mechanical property and anti-HIC (hydrogen induced cracking) performance of pair steel to have a negative impact.The strength matching of carbon and steel relation is also particularly important in addition, and proportional with the intensity of steel because of the height of carbon content, but the impelling strength of steel then obviously reduces, and do not satisfy the requirement to the steel high-intensity high-tenacity.Good welding property is the performance that gas transmission line must possess, and the low then corresponding welding property of carbon is good.Consider the factor of each side, carbon content control between 0.08～0.14%.
Manganese: as deoxidation material necessary element in steel-making, fairly obvious to the net effect of pipeline yield strength and tensile strength by solution strengthening, refined crystalline strengthening and phase transformation strengthening.Manganese is being carried the high-intensity while and can also improve the toughness of steel, reduces the ductile-brittle transition temperature of steel.American petroleum institute standard (API) regulation: X80 pipe line steel manganese content is not more than 1.90%, reduces the loss of strength that causes to remedy carbon content.According to the characteristics of seamless pipe line steel, manganese content is controlled between 1.10～1.50%.
Niobium: one of main alloy element of the design's steel grade is the micro alloying element that adds, and can improve intensity by refined crystalline strengthening and precipitation strength, can improve the low-temperature impact toughness of steel simultaneously.Thereby niobium reduces the thermoplasticity of steel and has increased the hot cracking tendency that contains niobium steel strand.Consider, X80 pipe line steel content of niobium is controlled between 0.020～0.050%.
Vanadium: one of main alloy element of the design's steel grade, have higher precipitation strength effect and Grain Refinement Effect, by raising surrender and the tensile strength of ferrite precipitation hardening and refinement ferrite crystal grain, but require finishing temperature low and jointly add with elements such as manganese, nitrogen, effect is better.When niobium, vanadium microalloy element compound use, vanadium is same by improve the intensity of steel in the ferrite with the VC precipitation strength.Consider, content of vanadium is controlled between 0.05～0.10%.
Molybdenum: one of main alloy element of the design's steel grade, enlarge the austenite phase region, separating out ferrite when postponing austenite to ferrite transformation forms, promote the principal element of the formation of bainite, phase-change organization plays an important role to control, behind the molybdenum of Xiang Gangzhong adding 0.10～0.20%, even also can obtain obvious bainite structure under slower speed of cooling, while can be so that organize further refinement owing to phase transformation changes to the low temperature direction.Consider, X80 pipe line steel molybdenum content is controlled between 0.10～0.20%.
Aluminium: be reductor, can not reach this effect when its content is lower than 0.005%, but during too high levels, easily cause inclusion to increase, produce hairline, reduce toughness and processing characteristics, therefore its content is controlled between 0.020～0.060%.
Nickel: one of main alloy element of the design's steel grade, reinforcement, atmospheric corrosion resistance element, improve intensity and can suitably improve toughness by the ferrite solution strengthening, can obviously improve sea water corrosion resistant with copper or phosphorus coexistence, also can overcome the hot-short phenomenon of Copper Bearing Steel, therefore its content is controlled between 0.10～0.20%.
Copper: one of main alloy element of the design's steel grade, the atmospheric corrosion resistance element adds separately easily generation " hot-short " and steel surface seminess, share with nickel, and therefore successful is controlled at its content between 0.10～0.20%.
In addition, in order to control the inclusion of steel grade, also carried out the calcium processing, for corrosion resistance and the low-temperature flexibility that improves steel, control S≤0.005%, P≤0.015%, the five-harmful elements sum requires less than 200ppm, finished product nitrogen is less than 120ppm, and finished product oxygen is less than 30ppm, and finished product hydrogen is less than 2ppm.
X80 steel-grade anti-corrosion low-temperature seamless line pipe of the present invention by above-mentioned steel grade component weight item is: C:0.08～0.14%, Si:0.20～0.35%, Mn:1.10～1.40%, P≤0.015%, S≤0.005%, Mo:0.10～0.20%, Al:0.020～0.060%, Nb:0.02～0.05%, V:0.05～0.10%, Cu:0.10～0.20%, Ni:0.10～0.20%, Ti :≤0.015%, Cr :≤0.15%, Ca:0.0015～0.0060%, B :≤0.0005%, N :≤0.012%, CEV≤0.43%, Pcm≤0.23%, all the other are iron, the impurity element trace.
Molten steel after the LF refining is complete is through VD vacuum stripping, and feeding Ca silk carries out calcium to be processed, and the suitable rear upper continuous casting platform of temperature carries out continuous casting, and casting process uses terminal induction stirring.
The performance of X80 steel-grade anti-corrosion low-temperature seamless line pipe of the present invention is:
Yield strength 555～705MPa, tensile strength 625～825MPa, yield tensile ratio≤0.92, unit elongation 〉=20%, the summer is than V-type-46 ℃ horizontal full-scale ballistic work 〉=100J, single shear area 〉=80%, on average 〉=90%, ductile-brittle transition temperature is below-60 ℃, hardness≤250HV10, grain fineness number 〉=8 grade are by HIC and SSC corrosion test.
Further specify as an example of Φ 323.8 * 20.00mm and Φ 508 * 26.19mm X80 seamless line pipe example:
1, batching smelting, continuous casting
By above-mentioned steel grade component weight item be: C:0.08～0.14%, Si:0.20～0.35%, Mn:1.10～1.40%, P≤0.015%, S≤0.005%, Mo:0.10～0.20%, Al:0.020～0.060%, Nb:0.02～0.05%, V:0.05～0.10%, Cu:0.10～0.20%, Ni:0.10～0.20%, Ti :≤0.015%, Cr :≤0.15%, Ca:0.0015～0.0060%, B :≤0.0005%, N :≤0.012%, CEV≤0.43%, Pcm≤0.23%, all the other are iron, the impurity element trace.
Molten steel after the LF refining is complete is through VD vacuum stripping, and feeding Ca silk carries out calcium to be processed, and the suitable rear upper continuous casting platform of temperature carries out continuous casting, and casting process uses terminal induction stirring, continuously cast bloom diameter of phi 350mm and Φ 400mm.Working control alloying constituent such as following table (w%):
| Steel grade | C | Si | Mn | P | S | Ni | Cr | Mo | Cu |
| 1 | 0.08 | 0.34 | 1.40 | 0.008 | 0.003 | 0.18 | 0.15 | 0.19 | 0.19 |
| 2 | 0.09 | 0.32 | 1.38 | 0.006 | 0.004 | 0.17 | 0.12 | 0.18 | 0.18 |
| 3 | 0.10 | 0.30 | 1.35 | 0.007 | 0.003 | 0.16 | 0.10 | 0.17 | 0.17 |
| 4 | 0.11 | 0.28 | 1.30 | 0.010 | 0.004 | 0.15 | 0.09 | 0.16 | 0.16 |
| 5 | 0.12 | 0.26 | 1.25 | 0.009 | 0.003 | 0.14 | 0.07 | 0.15 | 0.15 |
| 6 | 0.13 | 0.24 | 1.20 | 0.008 | 0.004 | 0.13 | 0.05 | 0.14 | 0.14 |
| 7 | 0.14 | 0.22 | 1.15 | 0.007 | 0.003 | 0.11 | 0.04 | 0.12 | 0.12 |
| Steel grade | Al | V | Nb | Ti | N | Ca | B | CEV | Pcm |
| 1 | 0.034 | 0.10 | 0.05 | 0.008 | 0.0089 | 0.0031 | 0.00024 | 0.43 | 0.20 |
| 2 | 0.041 | 0.09 | 0.04 | 0.012 | 0.0073 | 0.0037 | 0.00035 | 0.42 | 0.21 |
| 3 | 0.038 | 0.08 | 0.04 | 0.009 | 0.0067 | 0.004 | 0.00019 | 0.42 | 0.21 |
| 4 | 0.056 | 0.07 | 0.04 | 0.014 | 0.0071 | 0.0052 | 0.00030 | 0.41 | 0.22 |
| 5 | 0.051 | 0.07 | 0.04 | 0.007 | 0.0068 | 0.0028 | 0.00041 | 0.41 | 0.22 |
| 6 | 0.047 | 0.07 | 0.04 | 0.007 | 0.0056 | 0.0035 | 0.00032 | 0.40 | 0.23 |
| 7 | 0.029 | 0.06 | 0.03 | 0.011 | 0.0048 | 0.0049 | 0.00024 | 0.39 | 0.23 |
Annotate: steel grade 2 is produced Φ 323.8 * 20.00mm; Steel grade 4 is produced Φ 508 * 26.19mm.
2, Φ 323.8 * 20.00mm and Φ 508 * 26.19mm X80 seamless line pipe the finished product performance
(1) stretches
Get the pole sample of vertical Φ 12.7mm according to the standard-required tensile property, tensile property result such as following table.
| Steel grade | Temperature | Orientation | Rt0.5(MPa) | Rm(MPa) | Rt/Rm | A％ |
| 1 | 22 | Vertically | 590 | 670 | 0.88 | 28 |
| 2 | 22 | Vertically | 600 | 685 | 0.88 | 27 |
| 3 | 22 | Vertically | 610 | 690 | 0.88 | 26 |
| 4 | 22 | Vertically | 625 | 710 | 0.88 | 25 |
(2) impact
The horizontal V8 impact specimen of employing 10mm * 10mm * 55mm carries out-46 ℃ shock test, impact property result such as following table.
(3) hardness
H.7.3.3.2 require to measure the horizontal Vickers of pipe (HV10) hardness according to 44 editions appendix of API 5L, interior outer surface is respectively measured 4 points and is averaged, hardness result such as following table.
(4) grain fineness number
Φ 323.8 * 20.00mm pipe is carried out metallurgical analysis, and as shown in Figure 1, it is organized as tempering bainite+ferrite (B
Return+ F), grain fineness number is 9 grades.
(5) series impact
Adopt the horizontal V8 impact specimen of 10mm * 10mm * 55mm to carry out from 0 to-80 ℃ series impact test, impact results such as following table have been drawn the tough-brittle transition curve of Φ 323.8 * 20.00mm as shown in Figure 2.
(6) corrosion test
According to NACE TM 0177-2005 standard X80 line pipe mother metal is vertically carried out four-point bending SSC test, sample applies 80% of actual yield strength, soaks 720h in standardized solution NACE-A, and it is 2.7 that solution begins pH value, finishing pH value is 3.5, and test temperature is 23～27 ℃.According to NACE TM 0284-2003 standard X80 line pipe mother metal is vertically carried out the HIC test, at NACE-A solution soaking 96h.Corrosion test result such as following table.
Claims (1)
1. X80 steel-grade anti-corrosion low-temperature seamless line pipe, the weight proportion of the steel grade component of this line pipe is:
C:0.09%, Si:0.32%, Mn:1.38%, P≤0.006%, S≤0.004%, Mo:0.18%, Al:0.041%, Nb:0.04%, V:0.09%, Cu:0.18%, Ni:0.17%, Ti :≤0.012%, Cr :≤0.12%, Ca:0.0037%, B :≤0.00035%, N :≤0.0073%, CEV≤0.42%, Pcm≤0.21%, all the other are iron, the impurity element trace;
The performance of X80 steel-grade anti-corrosion low-temperature seamless line pipe:
Yield strength 555～705MPa, tensile strength 625～825MPa, yield tensile ratio≤0.92, unit elongation 〉=20%, summer is than V-type-46 ℃ horizontal full-scale ballistic work 〉=100J, single shear area 〉=80%, average 〉=90%, ductile-brittle transition temperature is below-60 ℃, hardness≤250HV10, grain fineness number 〉=8 grade, by HIC and SSC corrosion test, metallographic structure is tempering bainite+ferrite (B
Return+ F).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110138418 CN102154593B (en) | 2011-05-26 | 2011-05-26 | X80 steel grade anti-corrosion low-temperature seamless line pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110138418 CN102154593B (en) | 2011-05-26 | 2011-05-26 | X80 steel grade anti-corrosion low-temperature seamless line pipe |
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| Publication Number | Publication Date |
|---|---|
| CN102154593A CN102154593A (en) | 2011-08-17 |
| CN102154593B true CN102154593B (en) | 2013-01-16 |
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| EP2789702A1 (en) * | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | Heavy wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
| EP2789701A1 (en) * | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | High strength medium wall quenched and tempered seamless steel pipes and related method for manufacturing said steel pipes |
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