CN116334341A - Method for producing high-chromium corrosion-resistant sucker rod steel by converter - Google Patents

Method for producing high-chromium corrosion-resistant sucker rod steel by converter Download PDF

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Publication number
CN116334341A
CN116334341A CN202310264319.4A CN202310264319A CN116334341A CN 116334341 A CN116334341 A CN 116334341A CN 202310264319 A CN202310264319 A CN 202310264319A CN 116334341 A CN116334341 A CN 116334341A
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converter
chromium
steel
sucker rod
controlled
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Inventor
李小平
韩东亚
许勇伟
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Xinjiang Bayi Iron and Steel Co Ltd
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Xinjiang Bayi Iron and Steel Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific 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
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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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 method for producing high-chromium corrosion-resistant sucker rod steel by a converter, which is mainly applied to a steel mill for producing the high-chromium corrosion-resistant sucker rod steel by utilizing a converter-LF refining furnace-continuous casting process flow. The chromium content of the high-chromium corrosion-resistant sucker rod is more than 5%. The chromium content cannot be directly added to the component requirement range in the LF furnace by adopting the traditional converter-LF refining furnace-continuous casting process flow. The method comprises the steps of adding most of ferrochrome into a converter through a high-level bin before tapping at the end point of the converter, melting alloy by means of heat of the converter, controlling chromium content of molten steel in the converter to be more than 4%, controlling chromium oxidation in the converter by means of a technical means, ensuring that the yield of chromium in the converter is more than 90%, greatly relieving temperature reduction caused by adding chromium components in a converter tapping deoxidization alloying process and an LF refining furnace, and finally obtaining specified components and proper casting temperature of the high-chromium corrosion-resistant sucker rod steel.

Description

Method for producing high-chromium corrosion-resistant sucker rod steel by converter
Technical Field
The invention relates to a method for producing high-chromium corrosion-resistant sucker rod steel by a converter.
Background
In the traditional steelmaking process, chromium alloy is generally added in the tapping process of a converter, and component fine adjustment is carried out in the LF furnace process. According to the actual production on site, the temperature of molten steel is reduced to 8-10 ℃ every 1t of ferrochrome is added in the tapping process. According to the temperature drop range, for example, when smelting high-chromium corrosion-resistant sucker rod steel, the ferrochrome added in the tapping process of the converter is more than 10t, and the ferrochrome cannot be alloyed by adopting the conventional tapping process. Therefore, domestic manufacturers adopt intermediate frequency furnaces for smelting production. Under the condition of no intermediate frequency furnace and other alloy heating means, through experiments, the waste molten iron steel ratio can be adjusted through a converter, when the temperature before tapping at the smelting end reaches 1710-1720 ℃, most of ferrochrome is added into the converter through a high-level bin, the ferrochrome is melted by using the heat of the converter, a small amount of ferrochrome is continuously added in the tapping process for alloying, and the LF refining process continuously finely adjusts the components, so that the target components of the high-chromium corrosion-resistant sucker rod steel are finally met.
The primary form of sucker rod corrosion is cavitation. When the vapor pressure of the liquid is higher than its pressure with the surface of the sucker rod, bubbles will form near the surface of the sucker rod. In addition, gas dissolved in the liquid may be precipitated to generate bubbles. Then, when the bubbles flow to a place where the bubble pressure is lower than the liquid pressure, they are broken, and a large impact force is generated between the breaking moments. The sucker rod surface is repeatedly subjected to the repeated action of the instant impact force, and the surface material can fall off due to fatigue, so that small pits appear on the surface, the sucker rod surface is even further developed into a honeycomb shape, and large pits can be formed on the surface if the sucker rod surface is serious, and the depth can reach more than 3 mm. In the middle and later stages of the development of the oil field, along with the increase of the water content of the produced fluid, various ions are enriched around the sucker rod under the working condition, and when the sucker rod contacts with some corrosive ions or gaseous media, corrosion can occur, so that corrosion fatigue failure is most likely to occur.
Chromium-molybdenum steel is mostly adopted as steel for sucker rods, because chromium and molybdenum are surface active elements, the steel can block the anode process and promote the cathode process, and is beneficial to improving the corrosion resistance. When the sucker rod is in oil well operation, the sucker rod is mainly subjected to corrosion fatigue. A great deal of practical experience shows that the fatigue fracture failure of the sucker rod is mostly caused by pitting of the surface of the sucker rod. Pitting is a severe localized corrosion phenomenon that occurs in sucker rods in well fluid media. Therefore, the corrosion fatigue performance of the sucker rod must be improved, and the pitting corrosion resistance of the sucker rod must be improved. The results of studies on the pitting resistance of the alloy element show that the most effective elements for improving the pitting resistance of the steel are chromium and molybdenum. The study of the potential-pH diagram of Fe-Cr-Mo and Fe-Cr-Ni-Mo alloy experiments shows that chromium and molybdenum can reduce the ability of pitting nucleation and the growth rate of pitting development. Moreover, the effect of these two elements is also related to the nickel content in 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 passivation film along with the increase of the contents of chromium, nickel and molybdenum, so that an outer layer film with better protectiveness is formed. Meanwhile, the molybdenum can also effectively inhibit the depletion of chromium in the transition layer between the outermost layer of the passivation film and the matrix metal, so that the repassivation capability is improved, and the corrosion resistance of the material is improved.
Disclosure of Invention
The invention aims to provide a method for producing high-chromium corrosion-resistant sucker rod steel by a converter, which has simple and reasonable production process, and continuously fine-adjusts components through an LF refining procedure, so as to finally meet target components of the high-chromium corrosion-resistant sucker rod steel.
The technical proposal adopted by the invention is that a method for producing high-chromium corrosion-resistant sucker rod steel by a converter,
and (3) designing components of the high-chromium corrosion-resistant sucker rod:
Figure SMS_1
；
the process flow comprises the following steps: BOF-LF-CC;
alloying and adding modes of ferrochrome:
Figure SMS_2
；
control of the converter end point: the converter adopts a supplementary blowing operation, the temperature of primary furnace pouring is 1660-1680 ℃, primary carbon pouring is 0.06-0.08%, the final tapping temperature after secondary supplementary blowing is 1710-1720 ℃, the final tapping carbon content is 0.03-0.05%, most ferrochrome is added into the converter through a high-level bin of the converter before final tapping, the chromium content of molten steel in the converter is controlled to be more than 4%, and the tapping temperature is 1620-1650 ℃;
deoxidizing and alloying control of converter tapping: the converter tapping process is added in sequence: 2kg/t of calcium carbide, silicomanganese, ferrosilicon and low-carbon ferrochromium; the ladle composition is controlled as follows:
Figure SMS_3
；
LF refining process control: the converter reaches the temperature requirement of an LF furnace: 1540-1580 ℃, and controlling the slag alkalinity to be 2.8-3.2; alloy fine tuning: the fine adjustment of the steel ladle [ Cr ] adopts low-carbon ferrochrome, an LF furnace starts argon after molten steel arrives at a station according to the sampling result of a CAS procedure, 275kg of ferromolybdenum is added, low-carbon ferrochrome and ferroniobium alloy are added, and ferrotitanium is strictly forbidden to be added 20min before steel feeding; wire feeding control: taking possible aluminum components brought by the alloy into consideration, feeding wires according to the content of Al in the steel ladle, and controlling the ratio of calcium to aluminum in the molten steel according to 0.1-0.2; soft blowing time control: the soft blowing time is more than or equal to 16min;
and (3) controlling the components of a finished product:
Figure SMS_4
；
and (3) process control of continuous casting procedures: the long water gap of the large ladle adopts argon seal protection, the argon flow is controlled at 50 m/h, the tundish is protected by a covering agent, the liquid level of the continuous casting tundish is continuously blown with argon, the argon blowing time of the tundish is ensured to be more than or equal to 5min before starting up, the sealing gasket is added to the immersed water gap, and the thickness of the casting powder and the casting powder added to the crystallizer is controlled at 40+/-5 mm; the covering slag uses peritectic steel covering slag, and the covering agent adopts a low-carbon covering agent; the cooling water flow of the crystallizer is controlled to be 115-125 m/h, and the specific water flow of secondary cooling water distribution is controlled to be 0.45-0.55L/Kg; adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring;
the crystallizer and end electromagnetic stirring parameters are given in the following table:
Figure SMS_5
；
the pulling speed is controlled to be less than or equal to 2.2m/min, and the lowest pulling speed is controlled to be 1.4m/min.
The invention is applied to the production of high-chromium steel by adopting a converter-LF refining furnace-continuous casting process flow, and has ideal cost control and product quality.
Description of the embodiments
A method for producing high-chromium corrosion-resistant sucker rod steel by a converter,
and (3) designing components of the high-chromium corrosion-resistant sucker rod:
Figure SMS_6
；
the process flow comprises the following steps: BOF-LF-CC;
alloying and adding modes of ferrochrome:
Figure SMS_7
；
control of the converter end point: the converter adopts a supplementary blowing operation, the temperature of primary furnace pouring is 1660-1680 ℃, primary carbon pouring is 0.06-0.08%, the final tapping temperature after secondary supplementary blowing is 1710-1720 ℃, the final tapping carbon content is 0.03-0.05%, most ferrochrome is added into the converter through a high-level bin of the converter before final tapping, the chromium content of molten steel in the converter is controlled to be more than 4%, and the tapping temperature is 1620-1650 ℃;
deoxidizing and alloying control of converter tapping: the converter tapping process is added in sequence: 2kg/t of calcium carbide, silicomanganese, ferrosilicon and low-carbon ferrochromium; the ladle composition is controlled as follows:
Figure SMS_8
；
LF refining process control: the converter reaches the temperature requirement of an LF furnace: 1540-1580 ℃, and controlling the slag alkalinity to be 2.8-3.2; alloy fine tuning: the fine adjustment of the steel ladle [ Cr ] adopts low-carbon ferrochrome, an LF furnace starts argon after molten steel arrives at a station according to the sampling result of a CAS procedure, 275kg of ferromolybdenum is added, low-carbon ferrochrome and ferroniobium alloy are added, and ferrotitanium is strictly forbidden to be added 20min before steel feeding; wire feeding control: taking possible aluminum components brought by the alloy into consideration, feeding wires according to the content of Al in the steel ladle, and controlling the ratio of calcium to aluminum in the molten steel according to 0.1-0.2; soft blowing time control: the soft blowing time is more than or equal to 16min;
and (3) controlling the components of a finished product:
Figure SMS_9
；
and (3) process control of continuous casting procedures: the long water gap of the large ladle adopts argon seal protection, the argon flow is controlled at 50 m/h, the tundish is protected by a covering agent, the liquid level of the continuous casting tundish is continuously blown with argon, the argon blowing time of the tundish is ensured to be more than or equal to 5min before starting up, the sealing gasket is added to the immersed water gap, and the thickness of the casting powder and the casting powder added to the crystallizer is controlled at 40+/-5 mm; the covering slag uses peritectic steel covering slag, and the covering agent adopts a low-carbon covering agent; the cooling water flow of the crystallizer is controlled to be 115-125 m/h, and the specific water flow of secondary cooling water distribution is controlled to be 0.45-0.55L/Kg; adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring;
the crystallizer and end electromagnetic stirring parameters are given in the following table:
Figure SMS_10
；
the pulling speed is controlled to be less than or equal to 2.2m/min, and the lowest pulling speed is controlled to be 1.4m/min.

Claims (1)

1. A method for producing high-chromium corrosion-resistant sucker rod steel by a converter is characterized by comprising the following steps:
and (3) designing components of the high-chromium corrosion-resistant sucker rod:
Figure QLYQS_1
；
the process flow comprises the following steps: BOF-LF-CC;
alloying and adding modes of ferrochrome:
Figure QLYQS_2
；
control of the converter end point: the converter adopts a supplementary blowing operation, the temperature of primary furnace pouring is 1660-1680 ℃, primary carbon pouring is 0.06-0.08%, the final tapping temperature after secondary supplementary blowing is 1710-1720 ℃, the final tapping carbon content is 0.03-0.05%, most ferrochrome is added into the converter through a high-level bin of the converter before final tapping, the chromium content of molten steel in the converter is controlled to be more than 4%, and the tapping temperature is 1620-1650 ℃;
deoxidizing and alloying control of converter tapping: the converter tapping process is added in sequence: 2kg/t of calcium carbide, silicomanganese, ferrosilicon and low-carbon ferrochromium; the ladle composition is controlled as follows:
Figure QLYQS_3
；
LF refining process control: the converter reaches the temperature requirement of an LF furnace: 1540-1580 ℃, and controlling the slag alkalinity to be 2.8-3.2; alloy fine tuning: the fine adjustment of the steel ladle [ Cr ] adopts low-carbon ferrochrome, an LF furnace starts argon after molten steel arrives at a station according to the sampling result of a CAS procedure, 275kg of ferromolybdenum is added, low-carbon ferrochrome and ferroniobium alloy are added, and ferrotitanium is strictly forbidden to be added 20min before steel feeding; wire feeding control: taking possible aluminum components brought by the alloy into consideration, feeding wires according to the content of Al in the steel ladle, and controlling the ratio of calcium to aluminum in the molten steel according to 0.1-0.2; soft blowing time control: the soft blowing time is more than or equal to 16min;
and (3) controlling the components of a finished product:
Figure QLYQS_4
；
and (3) process control of continuous casting procedures: the long water gap of the large ladle adopts argon seal protection, the argon flow is controlled at 50 m/h, the tundish is protected by a covering agent, the liquid level of the continuous casting tundish is continuously blown with argon, the argon blowing time of the tundish is ensured to be more than or equal to 5min before starting up, the sealing gasket is added to the immersed water gap, and the thickness of the casting powder and the casting powder added to the crystallizer is controlled at 40+/-5 mm; the covering slag uses peritectic steel covering slag, and the covering agent adopts a low-carbon covering agent; the cooling water flow of the crystallizer is controlled to be 115-125 m/h, and the specific water flow of secondary cooling water distribution is controlled to be 0.45-0.55L/Kg; adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring;
the crystallizer and end electromagnetic stirring parameters are given in the following table:
Figure QLYQS_5
；
the pulling speed is controlled to be less than or equal to 2.2m/min, and the lowest pulling speed is controlled to be 1.4m/min.
CN202310264319.4A 2023-03-19 2023-03-19 Method for producing high-chromium corrosion-resistant sucker rod steel by converter Pending CN116334341A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101254527A (en) * 2008-02-01 2008-09-03 湖南华菱涟源钢铁有限公司 Method for producing low-carbon bainite high-strength steel based on thin slab continuous casting and rolling process
CN114438397A (en) * 2022-02-08 2022-05-06 新疆八一钢铁股份有限公司 Production process of high-chromium corrosion-resistant sucker rod
US20240068064A1 (en) * 2021-01-15 2024-02-29 Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) 400 MPa CORROSION-RESISTANT STEEL BAR AND PRODUCTION METHOD THEREOF

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101254527A (en) * 2008-02-01 2008-09-03 湖南华菱涟源钢铁有限公司 Method for producing low-carbon bainite high-strength steel based on thin slab continuous casting and rolling process
US20240068064A1 (en) * 2021-01-15 2024-02-29 Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) 400 MPa CORROSION-RESISTANT STEEL BAR AND PRODUCTION METHOD THEREOF
CN114438397A (en) * 2022-02-08 2022-05-06 新疆八一钢铁股份有限公司 Production process of high-chromium corrosion-resistant sucker rod

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈天明等: "转炉―大方坯连铸流程试制高铬管坯钢", 钢铁钒钛, vol. 32, no. 2, 15 May 2011 (2011-05-15), pages 39 - 42 *

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