CN114438397A - Production process of high-chromium corrosion-resistant sucker rod - Google Patents
Production process of high-chromium corrosion-resistant sucker rod Download PDFInfo
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- CN114438397A CN114438397A CN202210117396.2A CN202210117396A CN114438397A CN 114438397 A CN114438397 A CN 114438397A CN 202210117396 A CN202210117396 A CN 202210117396A CN 114438397 A CN114438397 A CN 114438397A
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- converter
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- furnace
- calcium carbide
- sucker rod
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a production process of a high-chromium corrosion-resistant sucker rod, which comprises the following steps of 1) designing the components in percentage by mass: 50Cr, 0.09-0.11C, 0.25-0.35 Si, 0.35-0.45 Mn, 0.005P, 0.005S, 4.9-5.1 Cr, 0.09-0.11 Mo, 0.025-0.035 Al, 0.025-0.035 Ti, and the balance Fe and impurities; 2) the process route is as follows: BOF-LF-CC; 3) alloying ferrochrome; 4) and (3) converter end point control: the converter adopts high-tension complementary blowing operation, the primary converter reversing temperature is 1600-; 5) pre-deoxidizing 2kg/t by using calcium carbide after the furnace, and performing final deoxidation by using aluminum iron, wherein when the final carbon content is between 0.03 and 0.04, 120kg of calcium carbide and 60kg of AlFe are added; when the end point carbon content% is between 0.04 and 0.05, 100kg of calcium carbide and 50kg of AlFe are added; when the end point carbon content% is between 0.05 and 0.06, 80kg of calcium carbide and 40kg of AlFe are added.
Description
Technical Field
The invention relates to a production process of a high-chromium corrosion-resistant sucker rod.
Background
The main form of corrosion of sucker rods is cavitation. When the vapor pressure of the liquid is higher than the pressure at the surface of the sucker rod, bubbles form near the surface of the sucker rod. In addition, gas dissolved in the liquid may precipitate to generate bubbles. Then, the bubbles are broken when they flow to a place where the pressure of the bubbles is lower than the pressure of the liquid, and a large impact force is generated at the moment of the breakage. The surface of the sucker rod is repeatedly subjected to the repeated action of the instant impact force, and the surface material falls off due to fatigue, so that small pits appear on the surface and even further develop into a honeycomb shape, and a large number of pits are formed on the surface seriously, and the depth can reach more than 3 mm. The oil field gets into the development middle and later stage, along with the rise of output liquid moisture content, multiple ion enrichment under the operating mode condition is around the sucker rod, when the sucker rod contacts some ions or gaseous medium that have corrosivity, will corrode, and then the fatigue failure that corrodes takes place for the most likely.
The steel used for the sucker rod is mostly made of chromium molybdenum steel, because chromium and molybdenum are surface active elements, the anode process can be retarded, the cathode process can be promoted, and the corrosion resistance can be improved. The sucker rod mainly bears corrosion fatigue during oil well operation. A great deal of practical experience shows that the fatigue fracture failure of the sucker rod mostly originates from pitting pits on the surface of the sucker rod. Pitting pits are a severe local corrosion phenomenon of the sucker rod in well fluid medium. Therefore, the corrosion fatigue resistance of the sucker rod is improved, and the pitting corrosion resistance of the sucker rod must be improved. Research results on the pitting corrosion resistance of alloying elements have shown that the most effective elements for improving the pitting corrosion resistance of steel are chromium and molybdenum. Research on potential-pH diagrams of Fe-Cr-Mo and Fe-Cr-Ni-Mo alloys in tests and behaviors of chromium and molybdenum in the local corrosion development process of steel shows that the chromium and the molybdenum not only can reduce the pitting nucleation (germination) capability, but also can reduce the pitting development (growth) speed. Furthermore, the effect of these two elements is also related to the nickel content of the steel. According to the analysis results of Auger Electron Spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) of the surface films of Fe-Cr-Mo and Fe-Cr-Ni-Mo alloys, the combined action of the 3 elements can increase the enrichment degree of chromium in the outer layer of the passive film along with the increase of the contents of chromium, nickel and molybdenum, and form an outer layer film with better protection. Meanwhile, molybdenum can effectively inhibit depletion of chromium in a transition layer between the outermost layer of the passivation film and the base metal, so that the re-passivation capability is improved, and the corrosion resistance of the material is improved.
And (3) searching documents: the research finds that there are journal such as "development of low carbon bainite sucker rod steel of 1000MPa grade", "research of corrosion mechanism and anticorrosion technique of continuous sucker rod", etc., through comparison, the invention is very different from this kind of papers, inventions, the above-mentioned invention is created mainly from the angle of technological theory, demonstrate the anticorrosion mechanism of the anticorrosion sucker rod, the invention focuses on according to the mechanism of corrosion resistance, research how to carry on the production practice, finally obtain the qualified product.
Disclosure of Invention
The invention aims to provide a production process of a high-chromium corrosion-resistant sucker rod, which is characterized in that ferrochrome is directly added into a converter before the converter is blown, alloy is melted by means of the heat of the converter, meanwhile, the oxidation of chromium in the converter is controlled by a technical means, the yield of chromium in the converter is ensured to be more than 85%, the chromium content of molten steel in the converter is more than 4%, the temperature reduction caused by the tapping of the converter and the addition of chromium components in an LF (ladle furnace) is greatly relieved, and the specified components and the proper casting temperature of the high-chromium corrosion-resistant sucker rod are finally obtained.
The technical scheme of the invention is that a production process of a high-chromium corrosion-resistant sucker rod,
1) the high-chromium corrosion-resistant sucker rod comprises the following components in percentage by mass: 50Cr, 0.09-0.11C, 0.25-0.35 Si, 0.35-0.45 Mn, 0.005P, 0.005S, 4.9-5.1 Cr, 0.09-0.11 Mo, 0.025-0.035 Al, 0.025-0.035 Ti, and the balance Fe and impurities;
2) process path: BOF-LF-CC;
3) alloying and adding mode of ferrochrome:
4) control of the converter end point: the converter adopts high-tension complementary blowing operation, the primary converter reversing temperature is 1600-;
5) controlling converter tapping deoxidation: pre-deoxidizing 2kg/t by using calcium carbide after the furnace, and performing final deoxidation by using aluminum iron, wherein when the final carbon content is between 0.03 and 0.04, 120kg of calcium carbide and 60kg of AlFe are added; when the end point carbon content% is between 0.04 and 0.05, 100kg of calcium carbide and 50kg of AlFe are added; when the end point carbon content% is between 0.05 and 0.06, 80kg of calcium carbide and 40kg of AlFe are added.
The chromium content of the corrosion-resistant sucker rod is generally more than 1 percent, while the chromium content of the high-chromium corrosion-resistant sucker rod is 5 percent or even higher. By adopting the traditional converter-LF refining furnace-continuous casting process flow, the chromium content can not be directly added to the range of composition requirement in the LF furnace. The invention adopts the technical scheme that ferrochrome is directly added into a converter before the converter is blown, alloy is melted by means of the heat of the converter, and meanwhile, the oxidation of chromium in the converter is controlled by technical means, so that the yield of the chromium in the converter is ensured to be more than 85 percent, and meanwhile, the chromium content of molten steel in the converter is more than 4 percent, thereby greatly relieving the temperature reduction caused by the converter tapping and the addition of chromium components in an LF (ladle furnace), and finally obtaining the specified components and the proper casting temperature of the high-chromium corrosion-resistant sucker rod.
In the traditional steel-making process, the chromium element is generally selected to be added in the tapping process of a converter, and the composition fine adjustment is carried out in the LF furnace process. According to the actual field production, the temperature of the molten steel is reduced to 30-40 ℃ every 1t of ferrochrome is added in the tapping process. According to the temperature reduction range, if high-chromium steel (such as a 5Cr corrosion-resistant sucker rod) is smelted, the amount of ferrochrome alloy added in the tapping process of the converter is more than 10t, and the ferrochrome cannot complete the alloying process by adding in the traditional tapping process. Therefore, under the condition of no intermediate frequency furnace or other alloy heating means, ferrochrome is added in the smelting process of the converter, the converter is used for adjusting the molten iron ratio, a heating agent is added in the smelting process, and the like, the ferrochrome is melted by utilizing the heat of the converter, and a small amount of ferrochrome is added in the tapping process for alloying after the end temperature and the components reach the standard, so that the target components of high-chromium steel are finally met.
Detailed Description
A production process of a high-chromium corrosion-resistant sucker rod,
1) the high-chromium corrosion-resistant sucker rod comprises the following components in percentage by mass: 50Cr, 0.09-0.11C, 0.25-0.35 Si, 0.35-0.45 Mn, 0.005P, 0.005S, 4.9-5.1 Cr, 0.09-0.11 Mo, 0.025-0.035 Al, 0.025-0.035 Ti, and the balance Fe and impurities;
2) process path: BOF-LF-CC;
3) alloying and adding mode of ferrochrome:
4) control of the converter end point: the converter adopts high-tension complementary blowing operation, the primary converter reversing temperature is 1600-;
5) controlling converter tapping deoxidation: pre-deoxidizing 2kg/t by using calcium carbide after the furnace, and performing final deoxidation by using aluminum iron, wherein when the final carbon content is between 0.03 and 0.04, 120kg of calcium carbide and 60kg of AlFe are added; when the end point carbon content% is between 0.04 and 0.05, 100kg of calcium carbide and 50kg of AlFe are added; when the end point carbon content% is between 0.05 and 0.06, 80kg of calcium carbide and 40kg of AlFe are added.
Claims (1)
1. The production process of the high-chromium corrosion-resistant sucker rod is characterized in that:
1) the high-chromium corrosion-resistant sucker rod comprises the following components in percentage by mass: 50Cr, 0.09-0.11C, 0.25-0.35 Si, 0.35-0.45 Mn, 0.005P, 0.005S, 4.9-5.1 Cr, 0.09-0.11 Mo, 0.025-0.035 Al, 0.025-0.035 Ti, and the balance Fe and impurities;
2) process path: BOF-LF-CC;
3) alloying and adding mode of ferrochrome:
4) Control of the converter end point: the converter adopts high-tension complementary blowing operation, the primary converter reversing temperature is 1600-;
5) controlling converter tapping deoxidation: pre-deoxidizing 2kg/t by using calcium carbide after the furnace, and performing final deoxidation by using aluminum iron, wherein when the final carbon content is between 0.03 and 0.04, 120kg of calcium carbide and 60kg of AlFe are added; when the end point carbon content% is between 0.04 and 0.05, 100kg of calcium carbide and 50kg of AlFe are added; when the end point carbon content% is between 0.05 and 0.06, 80kg of calcium carbide and 40kg of AlFe are added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210117396.2A CN114438397A (en) | 2022-02-08 | 2022-02-08 | Production process of high-chromium corrosion-resistant sucker rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210117396.2A CN114438397A (en) | 2022-02-08 | 2022-02-08 | Production process of high-chromium corrosion-resistant sucker rod |
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| Publication Number | Publication Date |
|---|---|
| CN114438397A true CN114438397A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210117396.2A Pending CN114438397A (en) | 2022-02-08 | 2022-02-08 | Production process of high-chromium corrosion-resistant sucker rod |
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| Country | Link |
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| CN (1) | CN114438397A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116334341A (en) * | 2023-03-19 | 2023-06-27 | 新疆八一钢铁股份有限公司 | Method for producing high-chromium corrosion-resistant sucker rod steel by converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB763983A (en) * | 1953-03-07 | 1956-12-19 | Pompey Acieries | Improvements in the manufacture of heat treated low alloy steels |
| JPH09316514A (en) * | 1996-05-24 | 1997-12-09 | Nisshin Steel Co Ltd | Method for estimating carbon and chromium contents in molten steel in converter process of chromium-containing steel and device therefor and method for tapping molten steel thereof |
| JP2000063994A (en) * | 1998-08-20 | 2000-02-29 | Kawasaki Steel Corp | Oil well pipe chromium-containing steel |
| CN106755709A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys |
| JP2020002406A (en) * | 2018-06-26 | 2020-01-09 | 日本製鉄株式会社 | Manufacturing method of steel |
-
2022
- 2022-02-08 CN CN202210117396.2A patent/CN114438397A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB763983A (en) * | 1953-03-07 | 1956-12-19 | Pompey Acieries | Improvements in the manufacture of heat treated low alloy steels |
| JPH09316514A (en) * | 1996-05-24 | 1997-12-09 | Nisshin Steel Co Ltd | Method for estimating carbon and chromium contents in molten steel in converter process of chromium-containing steel and device therefor and method for tapping molten steel thereof |
| JP2000063994A (en) * | 1998-08-20 | 2000-02-29 | Kawasaki Steel Corp | Oil well pipe chromium-containing steel |
| CN106755709A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys |
| JP2020002406A (en) * | 2018-06-26 | 2020-01-09 | 日本製鉄株式会社 | Manufacturing method of steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116334341A (en) * | 2023-03-19 | 2023-06-27 | 新疆八一钢铁股份有限公司 | Method for producing high-chromium corrosion-resistant sucker rod steel by converter |
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Application publication date: 20220506 |