WO2010026672A1

WO2010026672A1 - Seamless pipe of martensitic stainless steel for oil well pipe and process for producing the same

Info

Publication number: WO2010026672A1
Application number: PCT/JP2008/073918
Authority: WO
Inventors: 江口健一郎; 宮田由紀夫; 木村光男
Original assignee: Ｊｆｅスチール株式会社
Priority date: 2008-09-04
Filing date: 2008-12-24
Publication date: 2010-03-11
Also published as: CN102144041A; US20110132501A1; RU2468112C1; RU2011112690A; EP2322679A4; EP2322679B1; EP2322679A1; CN102144041B

Abstract

A seamless pipe of martensitic stainless steel for use as an oil well pipe. The seamless pipe is obtained by subjecting a seamless stainless-steel pipe having a composition containing, in terms of mass%, up to 0.020% carbon, 10-14% chromium, up to 3% nickel, up to 0.05% nitrogen, and 0.03-0.2% niobium, with the remainder being iron and inevitable impurities, to quenching in which the pipe is heated to a quenching temperature not lower than the A_c3 transformation point and then cooled to a temperature of 100°C or lower at a cooling rate not lower than those of air cooling and, subsequently to the quenching, to tempering in which the pipe is heated to a tempering temperature not lower than 550°C and then cooled. This seamless pipe has a tempered martensitic structure in which the amount of niobium precipitated is 0.020% or larger. The pipe combines high strength including a yield strength (YS) in the 95-ksi class (665-758 MPa) with excellent low-temperature toughness including a vTrs of -40°C or lower. The seamless pipe can be subjected to warm straightening. Also provided is a process for producing the seamless pipe.

Description

Tethetic-type and its manufacturing field

The book is related to the oil well tesite system "" Ness S ee Seam ess be o Coy T a oods), and surrendered. d S en h) It relates to an oil well seam ess s ee be o T in which S has an altitude above g5ks 655 a) and a low temperature o ee a eo h ess and its manufacturing method.

, Crude oil price o P ce) e xh of oil sources expected in the near future. . P. . ) From the point of view, it has been difficult to save in the past o o, carbon dioxide (.a bon d ox de gas, chlorio (including hoeo etc. and co os oevo me)) and gas as ed Cold region.odds C) seabed) dg. ". E is severe, and the fields such as rice fields are flourishing. The oil well steel pipes used in the environment are more likely to have better food quality (.. s. S. It is required to have quality that combines excellent properties.

Since then, in the Sakai and Gas fields that contain 0 carbon dioxide, chlorine ion C, etc., 3 C tesite system pipes are often used as oil wells for mining.

, 2 002 363708 report includes C 00 ～ 0 ・ C 9 5 0, which is relatively high in C content and high in strength, and suitable for oil well pipes, etc. Stainless steel has been proposed. In the technology described in the 002 363708 report,

Reduce the amount of chemicals present in (poaseega nbounda y) to below 0.5, increase the size of carbide (max mmo ax s o oa b de from 0 to 200, and reduce the average Fe degree of carbide by 0 4 ) By suppressing the p ec pao of the carbide of the type and actively releasing the MC type of carbide. The sex can be greatly improved. In order to adjust the structure and composition of this compound to the desired range, the technology described in the report of 2002 32 708 is air-cooled () in hot working or air-cooled after soo ea me. (a ooo s and o Coo)) or air cooling after bodyification (), 45 o

The empe g) below 0C.

However, when applying the technique described in the report 2002 237008, when the temperature is lower than 4500C, the (sa gh e is performed at a low temperature, so ocess g San is introduced for correction, yielding to There was a title when there was a lot of uplifting.

The purpose of this project is to solve the problem of the technique, and to propose an oil well that has both high altitude on yielding S g5k (655 to 758 a) and excellent low temperature, and its specified manufacturing method. The case where the VS of the low temperature test shown here is below 40 ° C. Indication of light

That is, it is as follows.

() mass C 0 020 0 4 N 3 No. 0 03 to 0 0 05 including the remaining Fe and inevitable materials, and the weaving where the No. amount is 0 · 2020 above No. Has a yield on the 95k high and Pi Cha py "..)". An oil well tesite system that has both low temperature and a low temperature of 40 ° C.

2) Mass C 0 0 0 0 0 to 2 0 P 0 0 2 0 lower, S 0 0 0 lower, 0 0 lower, 0 4 N 3 lower, No. 0 03 0 · 2 0 0 5 lower, remaining Fe and inevitable It has both a composition and a weaving with a No. amount of 0 · 2020 in the No. calculation, combined with a high yield over 95ks and a low temperature characteristic with a vT s of 40 ° C below the test. Yui Tesite 3)) or (2), the above No. in relation to C,, ()

3 b 7 6 g 0 30 (where C, №,, prime abundance (ass)

Oil well tesite-based stainless steel that is contained to satisfy

. In (), as = a.

(4)) None None (3) In addition to the above-mentioned composition, the oil well tesite system is further composed of mas s, C 20, Mo 20 A state.

(5 (None of (4), in addition to the above composition, mas s, V 020 under T 0 0, under 0 005, or a composition containing 2 or more) Oil well tesite system to do.

() cs O ma o empe ae) on the tube with the composition of the balance Fe and inevitable material, including the lower part of mass C 0 020 C 0 4 N 3 and No. 0 0 3 0 2 0 5 After heating to baked e ch eeae), air cooling from degree to cold (coo a. In o

E ch n 9 that cools to below 00C, and then e e below 550oC c. . . Of oil well tensite-type stainless steel pipes that combine both the high degree of application and the excellent low-temperature properties.

.

() mass C 0 020 S 0 lower, No. 0 to 2 P 0 02 0 lower, S 0 0 0 lower, 0 0 lower, 0 to 4 N lower, N b 003 0 2 0 05 lower, remaining Fe and To a test tube having an inevitable composition. After heating to the above-mentioned temperature, cool down to 00C with air-cooling and then cool down to 55 ° C.

This is an oil well tesite stainless steel pipe that combines heating and cooling at temperatures below 0Cc and high temperature and excellent low temperature. (8) In (6) or (7), the above No. is related to CA () C 3 b 7 6 g 0 30 () where C, No, A Amount of element (mass)

The oil well tesite-based stainless steel tube that is contained to satisfy the requirements. In (6), A = ma.

(9) (6) None (8) In addition to the above-mentioned composition, the oil well tensite comprising s, under 20 and under Mo 20 and further containing two kinds Of the system test tube.

(0) (6 None (In addition to 9 above, in addition to the above composition, mas s, V 020 below T 0 0 below, 0 005 below or a composition containing 2 or more) Oil well tesite-based tube.

((6) None 0) At the deviation of the above-mentioned normal treatment s a he at a temperature of 4500 ° C., the temperature of the tesite system test tube is increased.

(2) An oil well tecite system obtained by the method described in (2)), wherein the length of the well by the normal treatment is 5 a lower. Mysterious

According to the light, ho S a gh e is possible, and even if correction processing is performed, the yield g5ks 655 to 758 a) is high, and vT s is lower than 40 ° C. Oil well

Tubes can be manufactured easily and stably, producing industrial results. Good for carrying out Ming

In order to achieve the above-mentioned objectives, the authors investigated the effects of component composition and heat treatment conditions (hea ea en. Do) on the aging of the three-site tube. As a result, C content is 0.02 It is limited to 0, and the C content is 0 to 4 degrees in the range where the food quality does not change, and even if it is relatively low N content below 3, it contains a relatively large number of Nos. It has been found that the use of these components prevents the formation of sex due to the (9 body ec ao) of the C-form. In addition, even if the above theorem is applied at 550, it is possible to secure the high above the yield S g5ks (655 758 a), and to make the tube with the characteristic that vs is below 40C. It was also found that the degree could be increased to higher than 4500 and that the addition of the correct treatment would be less than 15a.

Based on the above-mentioned findings, it has been completed through further studies. In the following, ass is simply written without notice.

It is a tensite-type test with a basic composition consisting of the balance Fe and inevitable materials, including the lower C 0 020 0 to 4 N 3, No 0 3 0 2 2005, and C 0 020 1 0 Lower, No. 0 · to 2 P 0 020 Lower, S 0 0 0 Lower, 0 0 Lower, 0 to 4 N 3 Lower, No. 003 to 0 2

It may be composed of the balance Fe and unavoidable materials, including 0 05

C is an important element related to the strength of the tesite stainless steel, and in order to secure the desired degree, it is desirable to have it over 0.003, but the content of C exceeds 0.020. The edible nature tends to decrease. For this reason, I limited it to C 0 020 below. Would you like to have strength and sex?

The range is from 0.003 to 0.55.

0-4

Is an element that protects and improves the eating habits. . so es sa. . ), Gas ss. os OC ack g) is an element that contributes effectively. If we have 0 C, we can secure the necessary food for the oil well, so we decided to limit it to 0 C. On the other hand, it is easy to synthesize freight of over 4 It is economically disadvantageous because it requires the addition of a large amount of expensive austenite to stop the tesite phase safety or hot working. For this reason, it was limited to 0 4 range. Preferably, it is 0 5 5 from the standpoint of maintaining a more stable structure hot working.

N 3

N, an element that has a protective effect and enhances the gas erosion. In order to obtain such an effect, the content of 0 or more is desired, but the content exceeding 3 only invites a manufacturing strike. For this reason, it was limited to the area below N 3. The preference is 5 to 2.5.

005

Is an element that greatly enhances sex, and such an effect is included on 0.003. On the other hand, if the content exceeds 0.50, a chemical compound is formed and the properties are lowered. Therefore, is limited to below 0.05. The preferred value is 0 0 0 · 02.

№ 003 ～ 0 2

№ is a bright element. b, an element that forms carbides and increases the strength of steel through conversion by b-chemicals. In addition, it has an important role in preventing the appearance of mold molds and improving the properties. In order to obtain such an effect, b is 0 03 and more preferably 0.03. It is necessary to have more than. In addition, from the point of further ・ 06 is preferred. On the other hand, if it exceeds 0 · 2, the sex will deteriorate. For this reason, No. was limited to the range of 03 to 0-2. The preferred range is 0 03 to 0.5. More preferred is 0.06 to 0 5.

Ingredients listed are the basic components. In addition, in addition to these basic components, the following components are also included: • 0 below, No. 0 · ∼ 2 • P 0020 below, S 000 below, 0 0 below The basic composition is preferred.

S 0

Is an element that acts as a deoxidizing agent in the usual way. It is clear that it is desirable to be able to improve the resistance to 0. The processing is also reduced. For this reason, we limited it to S 0. The preferred value is 0 0 3.

n 0 to 2 0

Is an element that increases the strength. In order to secure the necessary strength for oil well steel pipes, it is desirable that the content be over 0. However, the content exceeding 2.0 is adversely affecting the sex. For this reason, No. was limited to the range of 0 to 2.0. The preferred range is 0 · 5 to · 5.

P 0 020

P is an element that enhances the gas erosion of gas, and it is desirable to reduce this apparently, but it invites an extreme production cost. P was limited to less than 2020 as a range that could be implemented at a relatively low cost industrially and that would not make gas-eating habitable. The preference is below 0 0 5.

S 0 0 0

S is an element that makes interworking significant in the ip manufacturing process, and it is desirable that it be as small as possible. However, it is possible to manufacture ip at a level that is reduced to below 0.00. Et al., Limited to below S 0 0 0. The preference is below 0 00 3.

A 0 0

Is an element having a strong use, and in order to obtain such an effect, it is desirable to have it over 0.00, but if it contains more than 0 0, it adversely affects the sex. For this reason, the skin was limited to below 0 0. The preference is below 0.05.

In addition, it is preferable to have № in the above-mentioned range, and to satisfy equation () in relation to C,, and quantity.

C 3 4 No. 7 6 9 4 0 30 () Here, C, No., A Amount of element (mass))

In the equation (), it is calculated as, unavoidable, = mass. cT P20080739 8 No. If the quantity does not satisfy the above formula (), it cannot be combined with the desired strength (above 95 s) (the vT s of the experiment is 40 C).

In addition, in addition to the above-mentioned books, the following B group or 2 types may be contained.

A C 2 0 lower, o 2 0 lower or 2

B B 020 below, T 0 0 below, 0 005 below

Or 2 or more.

A C 2 0 bottom, o 2 0 bottom

Mo slip is also an element that has the effect of improving the food quality, and can be selected as necessary.

Is an element that has a strong protection and an effect of improving the properties, and in order to obtain this effect, it is desirable to have it on O 2. On the other hand, if the content exceeds 20%, the C or C compound part appears and the properties are lowered. For this reason, when C is contained, u is preferably limited to 2 · 0 or less. More preferred are 0, 2 and 0.

In addition, o is an element that has an effect of increasing to against by, and in order to obtain such an effect, it is desirable to have it over 0.2. On the other hand, if it exceeds 2.0, the strength will decrease and the material stock will rise. For this reason, it is preferable to limit it to below Mo 2 · 0. The preferred range is 0 2 to 0.

B V 0 20 below, T 0 0 below, 0 005 below 2 or more

V, T, and N are also elements that increase the strength, and can be selected as necessary or have two or more.

In order to obtain this effect, it is desirable to have V 0 02, T 0 02, and B 0 00 5. On the other hand, if it exceeds V 0 20 T 0 0 0 005, the characteristics will deteriorate. For this reason, if it has, it is preferable to limit it to below V 0 20 and below T 0 0 B 005. It is more preferable that 002 to 0 0 and T 0 02 to 0 · 05 B 0 00 5 to 0 · 0040. Other than the ingredients listed, Fe and unavoidable. Inevitable is 0 0 0. Finally, I will explain with the knitting of Akira's tube.

It has an organization that consists mainly of Ming Tesite (. E ed ma e s e ph.) In addition, it may have 5 detufflites (de a e e and austenite se e) as weaves outside the rue site (e e edma e se Phase). In addition, it is preferable to set the data light to 2 below from the viewpoint of machining. For austenite, it is preferable to lower it by 2 from the viewpoint of qualitative strength. As a result, the tube has a desired (vT of the test above 95k is 40C, and also has sufficient food quality. No. amount is 0 · 2020a in No. calculation. No. amount is 0. At 020, it is not possible to suppress the emergence of serotypes that adversely affect the sex, and the sex is degraded .. In addition, the preferred number is 0 · 025 mass.

In the case of Ming, it does not contain molds.

Note that the No. amount was the No. contained in the sample by obtaining the No. amount included in the electrolysis by electrolysis using the electrolysis method (e. O y c ... me hod).

Here, № is mainly composed of b and c. No., the diameter of the product is 35 nm. I will explain it by the way of the Ming's tube. Starting from a test tube having the composition described above, q. . h g). Apply ㏄). Furthermore, if necessary, corrective treatment may be applied to correct the goodness of the state.

It is not necessary to limit to the starting material having the above composition, but the converter having the above composition s ee oo ve e), electric e ec 0739 8. a. . , Vacuum (v ". Ng". Etc., manufactured continuously, etc. c "sg), (g. Ag) booge hod), bit be) in the usual way, etc. It is preferable to use these steel materials.

ann. It is preferable to use the process of a p m me hod or the nest type (ann. m n a d me m hod) to make the pipe of the desired method and the starting material. The push expression p. According to s me hod (h. You may manufacture the tube with x dn. It is also preferable to cool it down to chilled, air cooled (cooled to room temperature oom e p.).

() Can be done first.

A in Ming. After reheating to the above-mentioned temperature, cool it down to 00C with air cooling. As a result, fine tensite (a ens c Suce) can be obtained. Degree. On the other hand, since it cannot be heated to austenite (se e Sge Phase e.), And it cannot be made into a cold enough tesite weave after that, the desired (95ks) cannot be secured. For this reason, it was limited to more than Ac. The preference is under 000C.

Also, until the temperature is less than 00C at air cooling or above. Since the starting property in the morning is high, it can be cooled to 00 or less at the air cooling degree to the following, and tense can be obtained. Also, the retention in degrees should be above 0mn. m. g. . . s h. n) from the point of view.

Continued to be reasoned. Tomorrow, it is an important process to ensure excellent low-temperature properties. In the morning, the temperature is increased to 550C, c, and the following e pe ng e e a e is heated and held at a preferable temperature of 30. After that, it is preferably cooled to a room temperature and preferably cooled to room temperature. As a result, it has both high temperature on g5ks and low temperature characteristics with vT s below 40C.

Ⅳ It will be 200008398. Since the structure changes when the degree of positive treatment is higher than the baking temperature, the degree is 550C. For this reason, as described later, the yield YS is likely to vary. The burn-up is A. , The austenite phase is generated and transformed to qe ced aese by cooling. S decreases, and it is preferable that air cooling or higher cooling is sufficient from the viewpoint of obtaining sufficient tecite.

In addition, in the light, if necessary, it is possible to carry out corrective processing to correct the state of goodness, following the process. It is preferable to perform the correct treatment at a temperature above 4500C. When the correct processing degree is 450C, it is possible to add processing locally to the straightened tube, and mechanical characteristics and yield breakdown tend to occur. For this reason, when the correction process was performed, it was performed at a temperature of over 4500oC.

Note that the breakdown A S) of yield S is 5 a below.

Produced by the manufacturing method described above, having the above composition and weave, yielding 95ks J (655 ") degree and

“This is a tesite-based stainless steel tube that has both low temperature with T s below 40 ° C and sufficient food quality.

The composition shown in the figure was degassed and produced in a village with a continuous bit size of 2007. These materials are heated and

After the intermediate processing, it was air-cooled to (77 8 X 2 65).

From these tubes, the test () was taken and () Z 2 and 3 were subjected to firing, firing, or further corrective treatment.

And, from the test () that had been further treated with positive treatment, samples for electrolysis were collected. Electrolysis using the removed electrolysis P2008 073 8 Using the method of extraction, the number of the obtained electrolysis contained was obtained, and the number contained in the sample was obtained.

And and some more corrective tests

() Et al., P (s S e. ㎞en Sec ed by P Sa da d 5 T) was sampled and subjected to a tensile test to determine the tensile force (S, tensile TS). In the test () where the correction treatment was performed, A of the correction treatment was obtained. Positive treatment Tensile tests were conducted in the same way on a tube without the positive treatment made under the same conditions to obtain tensile S and tensile T), and the AS of S was obtained by straightening treatment.

A S Corrected pipe S) (No correct pipe S)

In addition, according to JZ 2242, V ditches (0 m) were collected from test materials that had undergone further correct treatment, and ㌣-pi test was performed to determine vT s and sex was evaluated. .

In addition, 3 mX 30 X 40 m thick materials were prepared by mechanics and tested.

In a test 20 NaC solution (0 gas atmosphere at 80 ° C. and 30 pressure) held in an octup (“oo a”), the interval between and was performed as (68). Therefore, the weight was measured and the degree was calculated by reducing the amount before and after the test.

The results obtained are shown in Tables 4 and 5.

(・ 4 to 23 29 and 30) The difference between the oil well and the food is not enough, and S is more than g5ks 655 a) and vT s is lower than 40C. It is possible to correct the warmth of the heat, and even if correction is applied, the average is small

(5) Testhetic type tube. On the other hand, if it falls outside the scope of the present invention (o · 3, 4 to 24 to 28), the strength is insufficient (95 s) or the low-temperature property is reduced (vT s is 40C).

) However, there are many corrections (AS is 5a) in which the high degree of accuracy cannot be secured at a desired level. 200807398

Correct processing o

o

(In) in) C (in)

850 25 50

85 2 5

8 0 2 00 00 50 65

850 2 67

5 2 65 550 5 50 2

5 50

5 00 2

0 5 700 2.5

850 2 2

2 50 00 2. 00

3 850 650

4 850 2 ・ 600

5 850 00 2

6 850 2. 60

Correct o

o

((C

(In) (in)

7 850 00 2

50 600 2

9 850 600 525

L 50 600 2.

L 5 600 0

Z 50 600 25

5 600 2

O 920 2. 3500 00

P 920 25 50

850 2 60

R 50 550

S 50 550 25

850 2 675

0 50 2 75 T P200807398

Birthplace, food

Output YS S Correct processing v

0 P Pa YS () y ss) AYS Pa)

7 J 82 930 0 0 ・ 0

8 07 749 875 50 03

9 07 852 875 3 50 003

20 0 02 863 894 55 05

2 02 868 897 5 55 005

22 0 049 838 873 60 04

23 048 896 923 55 003

24 855 053 47 50 06

25 00 3 833 094 42 55 04

26 0022 789 877 30 04

27 680 76 30 04

28 699 803 25 00

29 029 670 82 60 04

30 00 30 660 807 60 00

Claims

Solicitation

ass

C 0 020 Lower, C 0-4

N 3 bottom, № 0 03 ～ 0 2

0 05

In addition to the remaining Fe and inevitable materials, the No. quantity is No .. With a weave that is above 0.020, and the altitude above the yield 95ks

An oil well tensite system that combines low temperature with a T of 40 ° C. 2.ass,

C 0 020 Lower, S 0

M 0 2 0 P 0 020 bottom,

Under S 000, Under A 0 0,

0-4 N 3 down,

№ 0 03 0 2 0 05 Lower

And the remaining Fe and inevitable materials, and the weaving of which the No. amount is 0 20 0 in the No. calculation, and the high temperature on the yielding Sg5ks and the TS of the test lower than 40 ° C. Oil well tesite-based stainless steel that combines sex. 3 ・ No. is included in relation to C, A, so that the following formula () is satisfied.

. C 4 № 7 6 g 0 30) where C, №,, Elemental quantity (ass) P2000839 8 4 ・ In addition to the composition, the tesite-based test described in any one of the compositions selected from ass, C 20, Mo 2, or containing 2 species . 5 In addition to the composition, the tecite-based stent according to 4 above, further comprising ass, under 020, under T00, and under B005, and further comprising 2 or more. 6.mass,

C 0 020 Lower, C 0-4

N 3 bottom, No. 0 03 0/2

0 05 down

Containing stainless steel, balance Fe and inevitable material

To the tube. After heating to the above-mentioned temperature, cooling to a temperature of less than 00C with the temperature of air cooling up to

Following the heat treatment, heat up to 550C, c.

Of the tesite system tube. 7 ・ mass

C 0 020 lower, S 0 lower

0 to 2 P 0020 Bottom

S 00 0 lower, 0 0 lower,

0-4 N 3 down,

№ 0 03 ～ 0 2 0 05 Lower

Including the remainder F. And stainless steel composed of inevitable materials

After the tube is heated to a temperature of 3 or more, it is cooled by air cooling.

Cool down to below 00C 0739 8 Following the reason, 550C. Heating and cooling at the following times

Of the tesite system tube. 8 ・ No. is included to satisfy the following formula () in relation to C,

Tube. C 3 4 No. 7 6 9 4 0 30 () Here, C, No.,, prime abundance ass) 9 ・ In addition to the composition, ass, 2 0 lower, Mo 2 0 lower or A tesite-based test tube as described in any of 6 to 8 containing 2 types. In addition to 0 and composition, a tethetic stem according to any one of 6 to 9, wherein a, V 0 0, T 0 0, 0 005, and 2 or more are contained.

Of the tube.・ Corrective processing of at a temperature above 4500C

6 None Described in one of the zeros. 2. An oil well tensite system obtained by the method described in 2 above, wherein the AS of the positive treatment is 5 a or less.