CN101748330B - Steel for heat-resisting casing pipe and manufacturing method thereof - Google Patents
Steel for heat-resisting casing pipe and manufacturing method thereof Download PDFInfo
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- CN101748330B CN101748330B CN2008102047276A CN200810204727A CN101748330B CN 101748330 B CN101748330 B CN 101748330B CN 2008102047276 A CN2008102047276 A CN 2008102047276A CN 200810204727 A CN200810204727 A CN 200810204727A CN 101748330 B CN101748330 B CN 101748330B
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Abstract
The invention discloses a steel for heat-resisting casing pipes, which comprises the components in percentage by weight: 0.2-0.30% of C, 0.10-0.3% of Si, 0.4-1.0% of Mn, 0.5-1.5% of Cr, 0.1-0.5% of W and the balance Fe and inevitable impurities. The manufacturing method comprises the following steps: according to the above component proportion, smelting, casting and hot rolling to form a seamless steel pipe; after counterbalancing temperature in a temperature zone of 820-920 DEG C, keeping warm for 30-60 minutes, and carrying out austenitizing full treatment; carrying out quenching treatment; counterbalancing temperature of a quenching pipe in a temperature zone of 580-720 DEG C, keeping warm for 30-90 minutes, and carrying out drawing temper. The heat-resisting casing pipe produced with the above manufacturing method by the above components can obviously improve high-temperature behaviour, corrosion resistance and creep resistance therefore, especially can improve the permanence property thereof under high-temperature working environment for a long time and can greatly lower production cost.
Description
Technical field
The present invention relates to a kind of steel for heat-resisting casing pipe and method of manufacture thereof, relate in particular to a kind ofly be adapted between 300～400 ℃ of the temperature, air pressure about 20Mpa and the heavy crude heat extraction of life-time service with steel for heat-resisting casing pipe and method of manufacture thereof.
Background technology
Along with the continuous development of oil production industry and the continuous increase of consumption of petroleum amount, heavy crude producing has become the main output source of domestic and international many oil companies.At present, the viscous crude YO of China has reached more than 30,000 ten thousand tons, and wherein the heavy oil production of Liaohe Oil Field, Xinjiang Karamay oilfield accounts for 1/2 and 1/3 of its crude oil ultimate production respectively.In addition, the heavy oil production of external Canada, the U.S. and Venezuela is also all higher.Single well stimulation heat injection steam is all adopted in viscous oil recovery both domestic and external, and the viscosity of viscous crude is descended so that exploit therefore annual 2-4 the round of steam treatment that need greatly.Because making, steam injection operation receives the petroleum casing pipe expanded by heating to retrain admittedly and by cement, so sleeve pipe will receive very big stress (thermal stresses).In addition, in exploitation process,, make sleeve pipe can receive the effect of bigger tensile stress again because temperature descends.Sleeve pipe receives and above-mentionedly periodically drawing-alternating action of stress; Stress at the serious position of situation can reach more than the 700MPa; Simultaneously because the formation cementation of viscous crude is loose; In oil recovery process, be prone to shake out, under the situation about moving on the stratum, sleeve pipe also takes place to squeeze through regular meeting to be ruined distortion, bad break etc. and damages phenomenons.According to statistics, the cover loss rate average out to 14% of Liaohe Oil Field heavy oil wells, individual block reaches 30%.For this reason, the sleeve pipe product of external N80, P110 model was also tried out in this oil field, but actual cover loss rate all is difficult to reduce.
Original heat-resisting sleeve pipe product is main with C-Mn such as 25Mn2,25CrMo4, Cr-Mo steel grade mainly, and this is for the request for utilization that under the not high environment of bottom temperature, can satisfy the user basically.But; Drive the transformation of well to vapour by steam-stimulated well along with the viscous oil recovery mode; This has also proposed higher, harsher requirement for the effective tubing of heatproof sleeve, particularly at 350 ℃, 25Mpa vapor pressure with work long hours and more require it should possess the good temperature resistance ability down.Following table 1 is the chemical ingredients of existing heat-resisting sleeve pipe steel grade.
The chemical ingredients of the existing steel for heat-resisting casing pipe of table 1
Through patent retrieval, do not retrieve the relevant heat-resisting sleeve pipe steel grade and the patent of invention of method of manufacture, only retrieve the steel grades and the method for manufacture thereof of high-temperature resistant low alloy steel pipes such as station boiler, heat exchanger.But because above-mentioned field is with the environment for use of material and the very big difference of viscous oil recovery existence, so they all have bigger difference with the present invention at the aspects such as concrete composition, performance requriements and method of manufacture of steel grade, do not have comparability.In addition, the fire resistant, heat insulated oil line that adopts the compound interpolation of Cr-Mo-V-W to process, Mo wherein belongs to the more expensive alloy of price, causes production cost higher, and this steel grade mainly is to be used to make insulated tubing, and the purposes of this and steel grade of the present invention is also also inequality.
Summary of the invention
The objective of the invention is to design through the reasonable component design and processes; Provide a kind of heat-resisting with casing steel and method of manufacture thereof; With solve the high-temperature behavior that conventional thermal sleeve steel such as existing 25Mn2,25CrMo4 exist during life-time service under 350 ℃, 25Mpa air pressure poor, deform, do not meet the problem that fld vapour drives well exploitation request for utilization easily, can reduce manufacturing cost effectively simultaneously.
The objective of the invention is to realize like this: a kind of steel for heat-resisting casing pipe, its weight percent component is:
C：0.2-0.30％
Si：0.10-0.3％
Mn：0.4-1.0％
Cr：0.5-1.5％
W：0.1-0.5％
Other is Fe and unavoidable impurities.
Preferably, the weight percent component of said steel for heat-resisting casing pipe is:
C：0.22-0.28％
Si：0.25-0.30％
Mn：0.42-0.92％
Cr：0.56-1.4％
W：0.12-0.25％
Other is Fe and inevitable impurity.
Preferably, described steel for heat-resisting casing pipe comprises that also weight percent is at least a in 0.01～0.35% Al, the V element.
Preferably, the total amount of said impurity is lower than 0.05% by weight percentage.
A kind of method of manufacture of steel for heat-resisting casing pipe comprises the following steps:
Step 1 is by composition proportion smelting, casting and the hot rolling formation weldless steel tube of each described steel for heat-resisting casing pipe among the claim 1-5;
Step 2, insulation was carried out austenitizing in 30-60 minute and is fully handled behind 820 ℃～920 ℃ humidity province sammings;
Step 3 is carried out quench treatment;
Step 4, quenching pipe are incubated 30-90 minute and carry out temper behind 580 ℃～720 ℃ temperature range sammings.
Preferably, the quenchant in the said step 3 is a water.
The selection principle of chemical ingredients scope of the present invention is following:
C guarantees steel pipe room temperature strength and the necessary composition of hardening capacity, but when carbon content is lower than 0.05% hardening capacity and insufficient strength, be higher than 0.25% toughness and degenerate.
Si adds the effect of having played deoxidation in the steel.Be lower than 0.01% content DeGrain.After content surpassed 1.0%, processibility and toughness worsened.
Cr is a carbide forming element, can improve room temperature, hot strength and the hardening capacity of steel, and still, Cr content was less than 0.5% o'clock, and DeGrain surpasses the toughness that can reduce steel at 2.0% o'clock greatly.
Mn is an austenite former, can improve the hardening capacity of steel, and content is not obvious less than effect in 0.1% o'clock, and content was greater than 1.0 o'clock, and the microstructure segregation tendency increases the weight of, and influences the homogeneity of hot rolling microstructure.
W is a carbide forming element, can improve obvious raising steel instantaneous and creep rupture strength and hardening capacity at high temperature, and still, W content was less than 0.1% o'clock, and DeGrain surpasses the toughness that can reduce steel at 1.0% o'clock greatly.
Al has played the effect of desoxydatoin and crystal grain thinning in steel, when add-on is lower than 0.01%, and DeGrain, add-on surpasses 0.10%, the mechanical property variation.
V is a carbide forming element, can improve obvious raising steel instantaneous and creep rupture strength and hardening capacity at high temperature, and still, W content was less than 0.01% o'clock, and DeGrain surpasses the toughness that can reduce steel at 0.05% o'clock greatly.
The present invention makes it compared with prior art owing to adopted above technical scheme, has the following advantages and positively effect:
(1) steel grade of the present invention belongs to the low alloy steel category, compares with existing steel grade, is reducing on the basis of carbon content element such as a small amount of Cr-W-V of compound adding; The heat-resisting sleeve pipe that adopts this composition and method of manufacture to produce; Can improve the high-temperature behavior of steel on the one hand, help the scene, oil field and control, also can significantly improve the corrosion resistance of steel and the ys under room temperature and the hot conditions on the other hand; Especially can promote the enduring quality of steel under long-time high-temperature work environment; Its hot strength is compared conventional products can improve 30%, and corrosion resistance improves more than 2 times, promotes obviously at hot strength, the creep-resistant property of (especially 250～400 ℃ temperature under) below 400 ℃; And finally surpass 600Mpa in the intensity of said temperature scope, therefore be applicable to that fully the vapour of fld drives viscous oil recovery.
(2) the alloy amount in the steel chemical composition of the present invention is relatively low, compares with high-temperature refractory steels such as existing station boiler, heat exchangers, can reduce production costs significantly, so cost advantage is obvious.
Embodiment
The chemical ingredients of table 2 expression test steel, A1-A6 is a steel alloy of the present invention, B1-B5 is the contrast steel.
The chemical ingredients (wt%) of table 2 steel of the present invention and existing thermal recovery casing steel
Above-mentioned test steel is through smelting, casting and hot rolled weldless steel tube; At first carry out carrying out after austenitizing is fully handled water quenching and handle 820 ℃～920 ℃ humidity provinces, steel pipe under said temperature after insulation in 30-60 minute shrend can obtain the martensitic stucture more than 95%.Quenching pipe carries out temper and is incubated 30-90 minute 580 ℃～720 ℃ temperature ranges subsequently, obtains evenly tiny sorbite tissue.Such is organized in long-time high temperature undertissue and stable performance, and high temperature endurance performance is good.Its body room temperature ys is finally greater than 650Mpa, and intensity rank reaches in the API5CT of the API standard intensity and the performance level of grade of steels such as desired 80 and 90,95,110,125 respectively.
Table 3 is mechanical property contrast tables of patent steel of the present invention and compared steel.
The mechanical property contrast of table 3 steel of the present invention and compared steel
Can find out from the test-results of table 3 that hot strength and the high temperature deformation resistance ability of steel alloy of the present invention are obviously compared according to steel will get well; Especially high-temperature yield strength all reached the SMYS of API 5CT regulation and stipulation should be greater than the requirement of 552Mpa, have only 440Mpa and the high-temperature yield strength of contrast steel grade is minimum.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (5)
1. steel for heat-resisting casing pipe, its weight percent component is:
C：0.22-0.28％
Si：0.25-0.30％
Mn：0.42-0.92％
Cr：0.56-1.4％
W：0.12-0.25％
Other is Fe and inevitable impurity.
2. steel for heat-resisting casing pipe as claimed in claim 1 is characterized in that also comprising that weight percent is at least a in 0.01～0.35% Al, the V element.
3. steel for heat-resisting casing pipe as claimed in claim 2 is characterized in that the total amount of said impurity is lower than 0.05% by weight percentage.
4. the method for manufacture of a steel for heat-resisting casing pipe is characterized in that comprising the following steps:
Step 1 is by composition proportion smelting, casting and the hot rolling formation weldless steel tube of each described steel for heat-resisting casing pipe among the claim 1-3;
Step 2, insulation was carried out austenitizing in 30-60 minute and is fully handled behind 820 ℃～920 ℃ humidity province sammings;
Step 3 is carried out quench treatment;
Step 4, quenching pipe are incubated 30-90 minute and carry out temper behind 580 ℃～720 ℃ temperature range sammings.
5. the method for manufacture of steel for heat-resisting casing pipe as claimed in claim 4, the quenchant in the said step 3 is a water.
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| CN2008102047276A CN101748330B (en) | 2008-12-17 | 2008-12-17 | Steel for heat-resisting casing pipe and manufacturing method thereof |
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| CN101748330A CN101748330A (en) | 2010-06-23 |
| CN101748330B true CN101748330B (en) | 2012-05-30 |
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| CN111020369B (en) * | 2019-10-31 | 2021-04-23 | 鞍钢股份有限公司 | High-temperature-resistant 95 ksi-grade fire flooding thick oil heat-application seamless steel pipe and manufacturing method thereof |
| CN112143972B (en) * | 2020-09-23 | 2021-12-21 | 达力普石油专用管有限公司 | High-strength heat-resistant oil sleeve material and preparation method thereof |
| CN115261716B (en) * | 2021-04-30 | 2023-06-16 | 宝山钢铁股份有限公司 | High-strength heat-resistant sleeve for thickened oil development and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904120A (en) * | 2005-07-28 | 2007-01-31 | 宝山钢铁股份有限公司 | Steel for high temperature resistant anticorrosion heat insulating oil pipe and its manufacturing method |
| CN101270445A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Steel for fire resistant insulated tubing, insulated tubing and method for manufacturing same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904120A (en) * | 2005-07-28 | 2007-01-31 | 宝山钢铁股份有限公司 | Steel for high temperature resistant anticorrosion heat insulating oil pipe and its manufacturing method |
| CN101270445A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Steel for fire resistant insulated tubing, insulated tubing and method for manufacturing same |
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