CN109423574B - High-temperature oxygen corrosion resistant stainless steel, sleeve and manufacturing method thereof - Google Patents
High-temperature oxygen corrosion resistant stainless steel, sleeve and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses high-temperature oxygen corrosion resistant stainless steel which comprises the following chemical elements in percentage by mass: c: 0.10 to 0.20%, Si: 0.1-0.5%, Mn: 0.1-0.9%, Cr: 7-10%, Ni: 0.15 to 3.0%, Mo: 0.05 to 0.5%, Al: 0.01-0.04%, and the balance of Fe and other inevitable impurities; the high-temperature oxygen corrosion resistant stainless steel has a single tempered martensite structure, the surface of the high-temperature oxygen corrosion resistant stainless steel is provided with a passive film, and the passive film contains Cr, Ni and Mo elements. In addition, the invention also discloses a high-temperature oxygen corrosion resistant stainless steel sleeve and a manufacturing method thereof. The yield strength of the high-temperature oxygen corrosion resistant stainless steel sleeve is more than or equal to 700MPa, the impact toughness of the stainless steel sleeve is more than or equal to 100J, and the stainless steel sleeve can resist O under the environment of more than 500 DEG C2And CO2Coexisting corrosion.
Description
Technical Field
The invention relates to stainless steel, a sleeve and a manufacturing method thereof, in particular to high-temperature resistant stainless steel, a sleeve and a manufacturing method thereof.
Background
China has wide distribution of thick oil resources, the geological reserve reaches 1640Mt, and the land thick oil accounts for more than 20 percent of the total petroleum resources. The thickened oil is characterized by high asphaltene content and high colloid content. The yield of the thick oil with higher content of colloid and asphaltene accounts for about 7 percent of the total yield of the crude oil. The thickened oil is a brand new thickened oil thermal recovery technology, and a thickened oil thermal recovery well is relatively deep and has the characteristics of high steam injection temperature and high steam injection pressure. At present, the heavy oil recovery mainly adopts the heavy oil thermal recovery processes such as single-well steam huff and puff, multi-well steam flooding, fireflood and the like. The steam flooding thickened oil thermal recovery process becomes a preferred thickened oil recovery mode of an oil field due to simple construction operation, but the method has low crude oil recovery rate (about 30 percent) and large energy consumption, and domestic thickened oil is producedThe main production areas enter the later stage of steam flooding oil production, the situation that the yield of a single well is reduced rapidly and the economic benefit is poor is increasingly remarkable, and the change of a thickened oil production mode gradually becomes the primary task of each thickened oil production area. The recovery ratio of the fire flooding heavy oil thermal recovery process is high (about 70 percent), the energy consumption is low, the greenhouse gas emission is less, and the process is gradually adopted by oil fields as a replacement process of steam flooding heavy oil thermal recovery in recent years. However, the fireflood heavy oil thermal recovery process puts high requirements on the underground oil casing. The oil layer sleeve has the use environment temperature of 450-500 ℃, has special requirements on the high-temperature strength of the sleeve material, and has excellent oxidation and corrosion resistance when used in a high-temperature oxygen-enriched environment. At the same time, the combustion of crude oil produces CO2A gas. Therefore, the downhole pipe should have certain high-temperature strength and excellent high-temperature oxygen and CO resistance2And the corrosion resistance of the environment. High temperature oxygen and CO2The corrosion problem in the coexistence environment is a main difficulty to be solved by the technology, usually, austenitic stainless steel or nickel-based alloy is adopted in the fields of boilers, petrifaction and nuclear power to solve the problem of oxidation corrosion, but for the field of oil exploitation, the economical efficiency of the scheme is unacceptable for oil fields.
Chinese patent publication No. CN101748330A, publication No. 2010, 6/23/2010, entitled "steel for heat-resistant sleeve and method for manufacturing same", discloses a steel for heat-resistant sleeve. The casing pipe disclosed in the technical scheme of the patent document can meet the requirement of thick oil exploitation for steam flooding at 350 ℃ on the strength of the casing pipe, but cannot meet the requirement of fire flooding at 500 ℃ on corrosion resistance and mechanical property.
Chinese patent literature having publication No. CN103469085A, publication No. 2013, 12 and 25, and entitled "a petroleum casing pipe special for heavy oil thermal production well containing rare earth and a production method thereof" discloses a petroleum casing pipe special for heavy oil thermal production well containing rare earth and a production method thereof. The strength of the petroleum casing pipe related to the technical scheme disclosed in the patent document can meet the requirement of thick oil exploitation for steam flooding at 350 ℃ on the casing pipe strength, but cannot meet the requirement of fire flooding at 500 ℃ on CO resistance2And O2Ability of the environment to corrode.
The Chinese patent document with the publication number of CN106319367A and the publication date of 2017, 1 month and 11 days, namely 125ski high-toughness oil casing for producing thick oil by an SAGD method and a manufacturing method thereof discloses a 125ksi high-toughness oil casing for producing thick oil by an SAGD method and a manufacturing method thereof, however, the yield strength of the oil casing related to the technical scheme disclosed by the patent document is not lower than 800MPa at the ambient temperature of 350 ℃, the external extrusion deformation resistance is strong, and the actual collapse resistance is higher than the calculated API value by more than 56%.
Disclosure of Invention
One of the objects of the present invention is to provide a high temperature oxygen corrosion resistant stainless steel satisfying the requirement of having CO at 500 ℃ or higher2And O2The mechanical property and the corrosion property under the environment are required, and the yield strength of the high temperature oxygen corrosion resistant stainless steel is not lower than 500 MPa.
In order to achieve the purpose, the invention provides high-temperature oxygen corrosion resistant stainless steel which comprises the following chemical elements in percentage by mass:
c: 0.10 to 0.20%, Si: 0.1-0.5%, Mn: 0.1-0.9%, Cr: 7-10%, Ni: 0.15 to 3.0%, Mo: 0.05 to 0.5%, Al: 0.01-0.04%, and the balance of Fe and other inevitable impurities;
the high-temperature oxygen corrosion resistant stainless steel has a single tempered martensite structure, the surface of the high-temperature oxygen corrosion resistant stainless steel is provided with a passive film, and the passive film contains Cr, Ni and Mo elements.
High temperature CO2Steel products are subject to uniform corrosion in the environment and the corrosion reaction is further accelerated at higher temperatures, causing severe corrosion. In addition, corrosion is further catalyzed and aggravated in oxygen-containing environments. However, based on the requirement of high-temperature strength of the casing pipe in thermal production, the yield strength of the casing pipe material is 500MPa at 400-500 ℃.
In order to achieve the purpose, the inventor researches the influence rule of different alloy elements on the structure and the performance of the martensitic stainless steel. Through a great deal of research, the inventor finds that Cr has a great influence on the structure and the passive film, and on the one hand, martensite is not generated along with the increase of CrFerrite structure is easily formed in the steel, the difference of ferrite, martensite and Cr element content on phase boundary can cause the difference of local point positions, and CO is generated at high temperature2And O2Local corrosion can be caused to be initiated under the environment. In addition, Ni element can obviously improve the density and stability of the stainless steel surface passive film in high-temperature environment and can resist high-temperature CO2And O2Corrosion under the environment has a certain inhibiting effect. The crystal grains are refined through a reasonable cooling process, so that the obdurability of the material is further improved, and a layer of passive film containing Cr, Ni and Mo is formed on the surface of the sleeve under the combined action of high temperature and water environment in the heat treatment process, so that the high temperature oxygen corrosion resistance of a steel structure is improved.
Based on the design principle, the single tempered martensite structure is obtained by reasonable component design and a controlled cooling process of a specific deformation and heat treatment process. And (3) performing controlled cooling in the hot working and quenching processes to obtain the high-strength and high-toughness stainless steel sleeve.
According to the design principle, the chemical element components of the high-temperature oxygen corrosion resistant stainless steel are designed as follows:
c: c is used as an austenite forming element in the martensitic stainless steel, and the percentage of austenitizing the stainless steel at high temperature can be increased by increasing the content of C, so that the martensite under the room temperature condition is obtained, and the strength is improved. However, when the mass percentage of C is too high, the corrosion resistance of the stainless steel is lowered and the toughness is lowered. In order to ensure the desired strength, the high temperature oxygen corrosion resistant stainless steel of the present invention has C in an amount of 0.10 to 0.20% by mass.
Si: si is an important deoxidizer in steel making, but Si has a risk of promoting the formation of sigma phase and ferrite phase in stainless steel having a high Cr content, and sigma phase and ferrite have adverse effects on toughness and corrosion resistance of stainless steel. Therefore, the high-temperature oxygen corrosion resistant stainless steel of the invention limits the mass percent of Si to 0.1-0.5%.
Mn: mn can improve the strength of the stainless steel, and in the technical scheme of the invention, in order to ensure that the high-temperature oxygen corrosion resistant stainless steel used as the oil casing has the required strength, the Mn is added by more than 0.1 percent. However, if the mass percentage of Mn exceeds 0.9%, the toughness of the steel decreases. Therefore, the high temperature oxygen corrosion resistant stainless steel of the present invention has Mn in a mass percentage of 0.1 to 0.9%.
Cr: cr is an important element for improving the corrosion resistance of the stainless steel, and the addition of Cr ensures that the surface of the stainless steel can quickly form a corrosion-resistant passive film even in the air, thereby improving the CO content of the sleeve in the high-temperature resistant environment2Corrosion performance. On the other hand, addition of Cr element exceeding 10.0% increases the risk of ferrite precipitation, adversely affecting both hot workability and corrosion resistance of the product. Therefore, in the high-temperature oxygen corrosion resistant stainless steel, the mass percent of Cr is limited to be within the range of 7-10%.
Ni: ni is an element for enlarging an austenite region, and has the function of improving the corrosion resistance and the toughness of the stainless steel, particularly under the high-temperature condition of 500 ℃. In addition, Ni can also improve the density and stability of a passive film of steel in a high-temperature environment. In order to obtain the above effect, the mass percentage of Ni is more than 0.15%. However, if the mass percentage of Ni exceeds 3%, an austenite phase in which strength cannot be controlled by heat treatment appears in the structure, and the strength is lowered. Therefore, Ni is limited to 0.15 to 3.0%.
Mo: mo is an element for improving the pitting corrosion resistance of the stainless steel. However, Mo is a noble metal element, and in the technical scheme of the invention, when the mass percent of Mo is too high, ferrite is precipitated, and the hot workability and the corrosion resistance of the product are adversely affected. Therefore, the high-temperature oxygen corrosion resistant stainless steel limits Mo to be within the range of 0.05-0.5%.
Al: al is added as a deoxidizer in the smelting process, and the addition amount of Al is more than 0.01 percent in order to achieve the deoxidizing effect. However, an Al content exceeding 0.04% causes a decrease in toughness. Therefore, in the high temperature oxygen corrosion resistant stainless steel of the present invention, Al is limited to the range of 0.01 to 0.04%.
P is to make CO resistant at high temperatures2Harmful elements whose corrosion properties are reduced, and adversely affect hot workability. If the content of P exceeds 0.015 percent, the corrosion resistance can not meet the high-temperature environment requirement, so the mass percent of the impurity element P is controlled to be less than 0.015 percent in the technical scheme of the invention.
Further, in the high-temperature oxygen corrosion resistant stainless steel, the mass percentage of the Cr element in the passivation film is 9.5-14.5%. The mass percentage of Cr is a mass percentage of the passivation film.
Further, in the high temperature oxygen corrosion resistant stainless steel, the mass percentage of the Ni element in the passivation film is 0.5-5.5%. The mass percentage of Ni is a mass percentage of the passivation film.
Further, the high-temperature oxygen corrosion resistant stainless steel is characterized in that the mass percentage of Mo element in the passivation film is 0.25-1.8%. The mass percentage of Mo is a mass percentage of the passivation film.
Accordingly, another object of the present invention is to provide a high temperature oxygen corrosion resistant stainless steel sleeve, which has excellent mechanical properties in a high temperature environment and can withstand O in an environment of 500 ℃ or higher2And CO2The coexisting corrosion performance is good.
In order to achieve the purpose, the invention provides a high-temperature oxygen corrosion resistant stainless steel sleeve which is made of the high-temperature oxygen corrosion resistant stainless steel.
Furthermore, in the high-temperature oxygen corrosion resistant stainless steel sleeve, the yield strength is more than or equal to 700MPa, the impact toughness is more than or equal to 100J, and the stainless steel sleeve can resist O under the environment of more than 500 DEG C2And CO2Coexisting corrosion.
It is another object of the present invention to provide a method for producing the above stainless steel sleeve, which is not particularly limited in terms of smelting, rolling of a raw pipe, and rolling of a steel pipe, and which is excellent in mechanical properties and corrosion resistance.
In order to achieve the above object, the present invention provides a method for manufacturing the stainless steel sleeve resistant to high temperature oxygen corrosion, comprising:
in the sizing step, the final rolling temperature is controlled to be 880-950 ℃, then the rapid cooling is carried out at a cooling speed of more than 15 ℃/s, the final cooling temperature of the rapid cooling is controlled to be 250-300 ℃, and then the air cooling is carried out to be below 100 ℃;
and (3) carrying out a quenching and tempering step after the sizing step, wherein the quenching and tempering step comprises a quenching step and a tempering step.
In the production method of the present invention, there is no particular limitation in the aspects of smelting, rolling of a pipe blank, and rolling of a steel pipe, and a pipe blank can be produced by a conventional smelting method such as a converter, an electric furnace, a vacuum induction furnace, etc., by a method such as continuous casting, bloom, etc. Then the tube blank is made into a seamless steel tube with specified size by perforation, continuous rolling and tension reducing (sizing).
And then, controlling process conditions in the sizing step, and obtaining the required sleeve with excellent performance after the tempering step.
Further, in the manufacturing method of the present invention, the cooling rate of the rapid cooling is 15 to 40 ℃/s. The rapid cooling speed is controlled to be less than 40 ℃/s so as to prevent the steel pipe from cracking caused by overlarge stress.
Further, in the manufacturing method of the present invention, in the quenching step, the steel pipe is heated to a temperature of AC3 or higher, and then rapidly cooled at a cooling rate of 15 ℃/s or higher, the final cooling temperature of the rapid cooling is controlled to be 250 ℃ or higher and 300 ℃ or lower, and then air-cooled to 100 ℃ or lower.
Further, in the manufacturing method of the present invention, the cooling rate of the rapid cooling in the quenching step is 15 to 40 ℃/s. Also, the rapid cooling rate of the quenching step is controlled to be less than 40 ℃/s to prevent cracking of the steel pipe due to excessive stress.
Further, in the manufacturing method of the present invention, in the tempering step, the tempering temperature is controlled to be 560 to 620 ℃. The tempering treatment is to ensure that the sleeve has excellent impact toughness and the required properties, such as tensile strength, are achieved.
The stainless steel with high temperature oxygen corrosion resistance can be used for O-containing stainless steel with the temperature of 500 DEG C2And CO2Conditional corrosion resistance requirements. In addition, the high-temperature oxygen corrosion resistant stainless steel provided by the invention obviously improves the toughness of the sleeve, and the yield strength at 500 ℃ is not lower than 500 MPa.
Detailed Description
The stainless steel, the bushing and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to specific examples, which, however, should not be construed as unduly limiting the technical solution of the present invention.
Examples 1 to 10 and comparative examples 1 to 3
Table 1 shows the mass percentages of the respective chemical elements in the high temperature oxygen corrosion resistant stainless steels of examples 1 to 10 and the comparative steels of comparative examples 1 to 3.
Table 1 (wt%, balance Fe and inevitable impurity elements other than P, S)
| Numbering | C | Si | Mn | P | S | Cr | Ni | Mo | Al |
| Example 1 | 0.11 | 0.42 | 0.53 | 0.003 | 0.002 | 9.61 | 0.25 | 0.31 | 0.04 |
| Example 2 | 0.13 | 0.28 | 0.73 | 0.011 | 0.005 | 8.93 | 0.24 | 0.1 | 0.03 |
| Example 3 | 0.19 | 0.45 | 0.81 | 0.01 | 0.006 | 8.81 | 0.24 | 0.44 | 0.02 |
| Example 4 | 0.15 | 0.42 | 0.14 | 0.004 | 0.006 | 7.2 | 0.27 | 0.36 | 0.03 |
| Example 5 | 0.1 | 0.23 | 0.28 | 0.011 | 0.001 | 8.22 | 0.18 | 0.3 | 0.02 |
| Example 6 | 0.12 | 0.47 | 0.26 | 0.007 | 0.006 | 8.53 | 0.3 | 0.45 | 0.01 |
| Example 7 | 0.19 | 0.26 | 0.43 | 0.008 | 0.003 | 7.32 | 0.29 | 0.27 | 0.02 |
| Example 8 | 0.19 | 0.2 | 0.55 | 0.013 | 0.002 | 9.21 | 0.17 | 0.46 | 0.03 |
| Example 9 | 0.19 | 0.11 | 0.11 | 0.014 | 0.003 | 8.65 | 0.3 | 0.34 | 0.02 |
| Example 10 | 0.18 | 0.26 | 0.23 | 0.006 | 0.003 | 7.18 | 0.21 | 0.06 | 0.02 |
| Comparative example 1 | 0.19 | 0.25 | 1 | 0.009 | 0.005 | 7.8 | 0 | 0 | 0.02 |
| Comparative example 2 | 0.11 | 0.23 | 0.35 | 0.014 | 0.007 | 3.87 | 0.24 | 0.38 | 0.02 |
| Comparative example 3 | 0.14 | 0.16 | 0.85 | 0.009 | 0.003 | 5.83 | 0 | 0.29 | 0.02 |
The high temperature oxygen corrosion resistant stainless steels of examples 1-10 and the comparative steels of comparative examples 1-3 were subjected to smelting, casting, rolling, tube rolling, sizing, and tempering, wherein the process parameters involved in the sizing step and the tempering step are listed in table 2.
In the sizing step, the final rolling temperature is controlled to be 880-950 ℃, then the rapid cooling is carried out at the cooling speed of 15-40 ℃/s, the final cooling temperature of the rapid cooling is controlled to be 250-300 ℃, and then the air cooling is carried out to be below 100 ℃;
after the sizing step, carrying out a quenching and tempering step, wherein the quenching and tempering step comprises a quenching step and a tempering step, wherein in the quenching step, after the steel pipe is heated to a temperature above AC3, the steel pipe is rapidly cooled at a cooling speed of 15-40 ℃/s, the final cooling temperature of the rapid cooling is controlled to be 250-300 ℃, and then the steel pipe is air-cooled to be below 100 ℃; in the tempering step, the tempering temperature is controlled to be 560-620 ℃.
Table 2 lists specific process parameters in the manufacturing process for the high temperature oxygen corrosion resistant stainless steels of examples 1-10 and the comparative steels of comparative examples 1-3.
Table 2.
The high temperature oxygen corrosion resistant stainless steels of examples 1 to 10 and the comparative steels of comparative examples 1 to 3 were formed into a sleeve, and the high temperature oxygen corrosion resistant stainless steels obtained in each example had a single tempered martensite structure. The performance measurements were performed on the sleeves prepared in each example and comparative example, and the results of the performance tests are shown in Table 3. In addition, table 3 also shows the mass percentages of Cr, Ni, and Mo of the passivation films of the respective examples.
It should be noted that, the yield strength test adopts the method that the manufactured steel pipe is processed into an API arc-shaped sample, the API arc-shaped sample is obtained by taking the average number after being tested according to the API standard, and the average number is listed in Table 3;
the preparation of the high-temperature tensile sample is the same as that of the room-temperature tensile sample, the test temperature is 500 ℃, and the temperature is kept for 30min before the tensile test. The high temperature tensile property data are also shown in Table 3;
charpy V-type impact absorption work (i.e., impact toughness) test was performed by taking a V-type impact test specimen having a size of 5 × 10 × 55(mm) in cut volume on a steel pipe, averaging the V-type impact test specimen after testing according to AGB/T229 standard, converting the V-type impact test specimen into a full size of 10 × 55(mm) according to API5CT standard, and listing the V-type impact test specimen in table 3 at a test temperature of-10 ℃;
corrosion test of CO at high temperatures2、O2The coexistent corrosion test was conducted by immersing the sample in a high-temperature reaction furnace at 500 ℃ with CO2Partial pressure of 0.01MPa, O2Partial pressure is 0.02MPa, and the rest is N2Solution Cl prepared at room temperature-The concentration is 10000mg/L, the test time is 240h, and the weight of the sample before and after the test is compared to calculate the uniform corrosion rate.
Table 3.
As can be seen from Table 3, the sleeve made of the high temperature oxygen corrosion resistant stainless steel of each example of the present invention has a yield strength YS of 700MPa or more and an impact of 100J or more at-10 ℃. In addition, the sleeves of the various embodiments of the present disclosure are at 500 ℃ and contain CO2And high Cl-The uniform corrosion resistance is excellent under the environment of ion concentration. The sleeves of the examples of this case, which were made using controlled cooling, had better toughness and corrosion resistance than the comparative examples.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and many similar variations are possible. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (8)
1. The high-temperature oxygen corrosion resistant stainless steel sleeve is characterized by comprising the following chemical elements in percentage by mass:
c: 0.11 to 0.20%, Si: 0.1-0.5%, Mn: 0.1-0.9%, Cr: 7-10%, Ni: 0.15 to 3.0%, Mo: 0.05 to 0.5%, Al: 0.01-0.04%, and the balance of Fe and other inevitable impurities;
the high-temperature oxygen corrosion resistant stainless steel sleeve is provided with a single tempered martensite structure, the surface of the high-temperature oxygen corrosion resistant stainless steel sleeve is provided with a passivation film, and the passivation film contains Cr, Ni and Mo elements, wherein the mass percent of the Ni element in the passivation film is 0.5-5.5%;
wherein in the manufacturing process of the stainless steel sleeve pipe resistant to high temperature oxygen corrosion: in the sizing step, the final rolling temperature is controlled to be 880-950 ℃, then the rapid cooling is carried out at a cooling speed of more than 15 ℃/s, the final cooling temperature of the rapid cooling is controlled to be 250-300 ℃, and then the air cooling is carried out to be below 100 ℃;
and (3) carrying out a quenching and tempering step after the sizing step, wherein the quenching and tempering step comprises a quenching step and a tempering step.
2. The high-temperature oxygen corrosion resistant stainless steel sleeve according to claim 1, wherein the mass percentage of the Cr element in the passivation film is 9.5-14.5%.
3. The high-temperature oxygen corrosion resistant stainless steel sleeve according to claim 1, wherein the mass percentage of the Mo element in the passivation film is 0.25-1.8%.
4. The high temperature oxygen corrosion resistant stainless steel sleeve of claim 1,it is characterized in that the yield strength is more than or equal to 700MPa, the impact toughness is more than or equal to 100J, and the product can tolerate O in the environment with the temperature of more than 500 DEG C2And CO2Coexisting corrosion.
5. The steel casing according to claim 1, wherein the cooling rate of the rapid cooling is 15-40 ℃/s.
6. The steel sleeve according to claim 1, wherein in the quenching step, the steel tube is heated to a temperature of AC3 or higher, then rapidly cooled at a cooling rate of 15 ℃/s or higher, and the final cooling temperature of the rapid cooling is controlled to 250 ℃ and 300 ℃, and then air-cooled to 100 ℃ or lower.
7. The sleeve of high temperature oxygen corrosion resistant stainless steel according to claim 1, wherein the cooling rate of the rapid cooling in the quenching step is 15-40 ℃/s.
8. The high temperature oxygen corrosion resistant stainless steel sleeve according to claim 1, wherein in the tempering step, the tempering temperature is controlled to be 560 to 620 ℃.
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| CN201710774037.3A CN109423574B (en) | 2017-08-31 | 2017-08-31 | High-temperature oxygen corrosion resistant stainless steel, sleeve and manufacturing method thereof |
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| CN201710774037.3A CN109423574B (en) | 2017-08-31 | 2017-08-31 | High-temperature oxygen corrosion resistant stainless steel, sleeve and manufacturing method thereof |
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| CN109423574A CN109423574A (en) | 2019-03-05 |
| CN109423574B true CN109423574B (en) | 2021-02-19 |
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| CN114086074B (en) * | 2021-11-24 | 2022-11-25 | 马鞍山钢铁股份有限公司 | High-corrosion-resistance cold forging steel for ocean island reef and production method and heat treatment method thereof |
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| JP2003089851A (en) * | 2001-09-14 | 2003-03-28 | Nisshin Steel Co Ltd | High strength duplex stainless steel sheet having high elasticity, and production method therefor |
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