CN116479323A - H-resistant 2 S corrosion pipeline steel and corrosion test method thereof - Google Patents
H-resistant 2 S corrosion pipeline steel and corrosion test method thereof Download PDFInfo
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- CN116479323A CN116479323A CN202310236939.7A CN202310236939A CN116479323A CN 116479323 A CN116479323 A CN 116479323A CN 202310236939 A CN202310236939 A CN 202310236939A CN 116479323 A CN116479323 A CN 116479323A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 238000005260 corrosion Methods 0.000 title claims abstract description 31
- 230000007797 corrosion Effects 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000010998 test method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 30
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 15
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005336 cracking Methods 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000009489 vacuum treatment Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 2
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000005204 segregation Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C22C38/04—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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
-
- 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
- C21D2211/005—Ferrite
-
- 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
- C21D2211/009—Pearlite
-
- 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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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses an anti-H 2 S, corroding pipeline steel, wherein the chemical components of the pipeline steel are as follows in percentage by weight: 0.04-0.06%, si:0.10-0.20%, mn:1.00-1.20%, P: less than or equal to 0.010 percent, S: less than or equal to 0.002 percent, nb:0.020-0.040%, ti:0.010-0.020%, al:0.020-0.040%, cr:0.20-0.30%, H: less than or equal to 1.5ppm, O: less than or equal to 20ppm, N: less than or equal to 40ppm, and the balance of Fe and unavoidable impurities. Its preparing process and corrosion test method are also disclosed. The invention aims to provide H2S corrosion resistant pipeline steel and a corrosion test method thereof, wherein a steel belt is alloyed by Nb-Ti-Cr, the alloy cost is low, and HIC and SSC corrosion tests are described in detail.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to H2S corrosion resistant pipeline steel and a corrosion test method thereof.
Background
To meet future oil and gas demands, contain H 2 The number of S-fields developed has increased significantly compared to the past. At the same time, the demand for pipeline steel for acidic service has increased. H2S is one of the most corrosive harmful media in oil and gas, and when a conveying pipeline is exposed to a fluid medium containing wet H2S, acidic corrosion of H2S is easy to occur, so that the pipeline wall is thinned, etched holes, even broken and the like are caused, and the service life and safe operation of the pipeline are seriously affected.
The hydrogen sulfide corrosion resistant pipeline steel and the production method thereof disclosed in the patent publication No. CN 101928885A adopt Nb-Ti-V-Ni-Cu alloying of chemical components, have higher alloy cost, and do not describe the HIC hydrogen induced cracking and SSC stress corrosion test process (test conditions, test solvent, initial solution concentration and loading force) in detail.
Disclosure of Invention
Aiming at the problems that the production cost of high-grade H2S corrosion-resistant pipeline steel is high and the HIC and SSC test processes are not detailed, the invention aims to provide the H2S corrosion-resistant pipeline steel and the corrosion test method thereof, the steel strip is alloyed by Nb-Ti-Cr, the alloy cost is low, and the HIC and SSC corrosion tests are described in detail.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to an anti-H 2 S, corroding pipeline steel, wherein the chemical components of the pipeline steel are as follows in percentage by weight: 0.04-0.06%, si:0.10-0.20%, mn:1.00-1.20%, P: less than or equal to 0.010 percent, S: less than or equal to 0.002 percent, nb:0.020-0.040%, ti:0.010-0.020%, al:0.020-0.040%, cr:0.20-0.30%, H: less than or equal to 1.5ppm, O: less than or equal to 20ppm, N: less than or equal to 40ppm, and the balance of Fe and unavoidable impurities.
Further, the preparation process route is as follows: smelting: molten iron pretreatment-converter top-bottom combined blowing smelting-LF external refining-RH vacuum treatment-slab continuous casting-stacking slow cooling; rolling: slab heating, high-pressure water descaling, E1R1 rough rolling, E2R2 rough rolling, flying shears, high-pressure water descaling, F1-F7 finish rolling, encryption type laminar cooling, coiling, marking and warehousing; wherein:
smelting and casting: the smelting process adopts the KR method to desulfurize molten iron and high-quality scrap steel, and ensures that the S of the molten iron fed into the converter is less than or equal to 0.003%; when the converter is used for smelting, self-produced low-sulfur scrap steel is adopted, and the tapping temperature is more than or equal to 1620 ℃; the LF refining adopts a large amount of slag to carry out slagging and desulfurization, S is ensured to be less than or equal to 0.002%, ferrochrome and ferroniobium are added in the LF refining process, the RH vacuum treatment time is more than 20min, and ferrotitanium is added in the vacuum treatment process; performing calcium treatment on the molten steel after vacuum treatment, wherein the Ca content is 0.0010-0.0030 percent, and the argon soft blowing time is more than 12min, so that the inclusions are fully denatured and floated; the whole process of protection casting is carried out during slab continuous casting, the superheat degree is controlled at 15-30 ℃, the pulling speed is 0.90-1.10m/min, the center segregation of a casting blank is not more than C3.0 level, and the center porosity is not more than 2.0 level;
heating and rolling: the heating temperature of the slab is 1160-1180 ℃, the heating time is more than or equal to 120mi < n >, and the uniform temperature of the billet is ensured; the working rolling is controlled to be carried out in two stages of hot rolling, and the first stage is austenite recrystallization zone rolling, namely a rough rolling stage; the second stage is the rolling of an austenite non-recrystallization zone, namely a finish rolling stage; the initial rolling temperature of rough rolling is 1150-1170 ℃, the initial rolling temperature of finish rolling is less than or equal to 1000 ℃, and the final rolling temperature is 830-880 ℃;
and (3) cooling: after controlled rolling, the steel strip enters an encrypted laminar flow cooling area, is cooled to 540-580 ℃ at a cooling speed of 15-25 ℃/s, is coiled, is air-cooled to room temperature, and is obtained, wherein the structure of the steel strip is fine and uniform ferrite and pearlite.
Further, a Hydrogen Induced Cracking (HIC) test was performed according to NACE TM0284, and a hydrogen Sulfide Stress (SSC) corrosion test was performed according to NACE TM0177 and ISO 7539-2; performing transverse and longitudinal tests at the 1/4 and 1/2 positions of the width of the plate, preparing a solution for the test by distilled water and analytical grade chemicals, cleaning a sample by acetone to remove surface rust oil, cleaning by ethanol, and then placing the sample into a test container for testing; after 96 hours of hydrogen induced cracking (HI C) test, the surface and cross section of the sample were observed; the working section is observed after a 720h hydrogen Sulfide Stress (SSC) corrosion test and a 10-fold amplification.
Compared with the prior art, the invention has the beneficial technical effects that:
the Nb-T i-Cr alloy is adopted to produce the pipeline steel with excellent H2S corrosion resistance, the production process is simple, the cost is low, and the method can be widely popularized and applied to hot continuous rolling production lines. The corrosion test method is accurate in detail and has strong guidance and reference.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a metallurgical structure of a steel strip according to the present invention;
FIG. 2 shows the surface of a sample after a hydrogen induced cracking (H IC) test according to the present invention;
FIG. 3 shows the surface of a sample after a hydrogen induced cracking (H IC) test according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Examples 1 to 3 are an H-resistant composition of the invention 2 S corrosion pipeline steel and a corrosion test method thereof, wherein the chemical components, the process steps, the mechanical properties and the corrosion test method are adopted. These areThe examples are merely illustrative of the best mode of the invention and do not limit the scope of the invention in any way.
The chemical composition content of each example is shown in table 1; the process parameters are shown in Table 2; the mechanical properties and inclusions of the steels obtained are shown in tables 3 and 4; hydrogen induced cracking (H IC) corrosion tests are shown in tables 5 and 6; the hydrogen Sulfide Stress (SSC) corrosion test is shown in tables 7 and 8.
TABLE 1 chemical composition (wt%)
Table 2 process parameters
TABLE 3 mechanical Properties
TABLE 4 inclusions and grain size
TABLE 5 Hydrogen Induced Cracking (HIC) test conditions
TABLE 6 Hydrogen Induced Cracking (HIC) test
TABLE 7 Hydrogen Sulfide Stress (SSC) test conditions
TABLE 8 Hydrogen Sulfide Stress (SSC) Corrosion test
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. H-resistant 2 S corrodes pipeline steel, its characterized in that: the chemical components of the paint are as follows by weight percent: 0.04-0.06%, si:0.10-0.20%, mn:1.00-1.20%, P: less than or equal to 0.010 percent, S: less than or equal to 0.002 percent, nb:0.020-0.040%, ti:0.010-0.020%, al:0.020-0.040%, cr:0.20-0.30%, H: less than or equal to 1.5ppm, O: less than or equal to 20ppm, N: less than or equal to 40ppm, and the balance of Fe and unavoidable impurities.
2. The anti-H of claim 1 2 S corrodes pipeline steel, its characterized in that: the preparation process route is as follows: smelting: molten iron pretreatment-converter top-bottom combined blowing smelting-LF external refining-RH vacuum treatment-slab continuous casting-stacking slow cooling; rolling: slab heating-high pressure water removalscale-E1R 1 rough rolling-E2R 2 rough rolling-flying shear-high-pressure water descaling-F1-F7 finish rolling-encryption type laminar cooling-coiling-marking-warehousing; wherein:
smelting and casting: the smelting process adopts the KR method to desulfurize molten iron and high-quality scrap steel, and ensures that the S of the molten iron fed into the converter is less than or equal to 0.003%; when the converter is used for smelting, self-produced low-sulfur scrap steel is adopted, and the tapping temperature is more than or equal to 1620 ℃; the LF refining adopts a large amount of slag to carry out slagging and desulfurization, S is ensured to be less than or equal to 0.002%, ferrochrome and ferroniobium are added in the LF refining process, the RH vacuum treatment time is longer than 20min, and ferrotitanium is added in the vacuum treatment process; performing calcium treatment on the molten steel after vacuum treatment, wherein the Ca content is 0.0010-0.0030 percent, and the argon soft blowing time is more than 12 minutes, so that the inclusions are fully denatured and floated; the whole process of protection casting is carried out during slab continuous casting, the superheat degree is controlled at 15-30 ℃, the pulling speed is 0.90-1.10m/min, the center segregation of a casting blank is not more than C3.0 level, and the center porosity is not more than 2.0 level;
heating and rolling: the heating temperature of the slab is 1160-1180 ℃, the heating time is more than or equal to 120min, and the uniform temperature of the billet is ensured; the working rolling is controlled to be carried out in two stages of hot rolling, and the first stage is austenite recrystallization zone rolling, namely a rough rolling stage; the second stage is the rolling of an austenite non-recrystallization zone, namely a finish rolling stage; the initial rolling temperature of rough rolling is 1150-1170 ℃, the initial rolling temperature of finish rolling is less than or equal to 1000 ℃, and the final rolling temperature is 830-880 ℃;
and (3) cooling: after controlled rolling, the steel strip enters an encrypted laminar flow cooling area, is cooled to 540-580 ℃ at a cooling speed of 15-25 ℃/s, is coiled, is air-cooled to room temperature, and is obtained, wherein the structure of the steel strip is fine and uniform ferrite and pearlite.
3. The anti-H of claim 1 2 The corrosion test method of the S corrosion pipeline steel is characterized by comprising the following steps of:
hydrogen Induced Cracking (HIC) tests were performed according to the NACE TM0284 standard, and hydrogen Sulfide Stress (SSC) corrosion tests were performed according to NACE TM0177 and ISO 7539-2 standards; performing transverse and longitudinal tests at the 1/4 and 1/2 positions of the width of the plate, preparing a solution for the test by distilled water and analytical grade chemicals, cleaning a sample by acetone to remove surface rust oil, cleaning by ethanol, and then placing the sample into a test container for testing; after 96 hours of Hydrogen Induced Cracking (HIC) test, the surface and the cross section of the sample are observed; the working section is observed after a 720h hydrogen Sulfide Stress (SSC) corrosion test and a 10-fold amplification.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310236939.7A CN116479323A (en) | 2023-03-13 | 2023-03-13 | H-resistant 2 S corrosion pipeline steel and corrosion test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310236939.7A CN116479323A (en) | 2023-03-13 | 2023-03-13 | H-resistant 2 S corrosion pipeline steel and corrosion test method thereof |
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| CN116479323A true CN116479323A (en) | 2023-07-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117187686A (en) * | 2023-08-01 | 2023-12-08 | 包头钢铁（集团）有限责任公司 | Spiral submerged arc welded pipe hot rolled steel strip for hydrogen-doped conveying pipeline and production method thereof |
-
2023
- 2023-03-13 CN CN202310236939.7A patent/CN116479323A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117187686A (en) * | 2023-08-01 | 2023-12-08 | 包头钢铁（集团）有限责任公司 | Spiral submerged arc welded pipe hot rolled steel strip for hydrogen-doped conveying pipeline and production method thereof |
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