CN110004364B - Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof - Google Patents

Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof Download PDF

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CN110004364B
CN110004364B CN201910300087.7A CN201910300087A CN110004364B CN 110004364 B CN110004364 B CN 110004364B CN 201910300087 A CN201910300087 A CN 201910300087A CN 110004364 B CN110004364 B CN 110004364B
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CN110004364A (en
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许斌
孙毅
吕德文
贾改风
李冠楠
王硕阳
亢庆锋
柳风林
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Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
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HBIS Co Ltd Handan Branch
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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/18—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
    • C22C38/26—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
    • 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

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  • Crystallography & Structural Chemistry (AREA)
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Abstract

The invention discloses a large loading stress sulfide corrosion resistant X52MS hot rolled coil and a manufacturing method thereof, wherein the hot rolled coil comprises the following chemical components in percentage by mass: c: 0.02 to 0.06%, Si: 0.05-0.30%, Mn: 0.95-1.45%, P is less than or equal to 0.015%, S is less than or equal to 0.0012%, Cr: 0.05 to 0.20%, Mo: 0.05 to 0.20%, Ti: 0.005-0.030%, Nb: 0.005-0.045%, Ca: 0.001-0.004%, N is less than or equal to 55ppm, and the balance is Fe and inevitable impurities; the manufacturing method comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling. The invention improves the sulfide corrosion cracking performance of the X52MS hot rolled plate coil by designing components, controlling rolling and cooling processes.

Description

Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a large-loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and a manufacturing method thereof.
Background
With the rapid development of economy in China, the demand for sulfide stress corrosion cracking resistant pipeline steel is increasing day by day, and long-distance pipeline steel is required to have not only high strength, high toughness and good weldability, but also good hydrogen Sulfide Stress Corrosion Cracking (SSCC) resistance.
Hydrogen Sulfide Stress Corrosion Cracking (SSCC) is a tendency that hydrogen atoms generated from hydrogen sulfide permeate into steel, dissolve in crystal lattices to generate brittleness, and form cracks under the action of external stress or residual stress, and SSCC easily occurs due to internal defects and component segregation of a plate.
Because the zonal structure caused by the segregation of elements such as C, Mn is a good hydrogen transportation channel. The sensitivity of the corrosion-resistant steel of the material can be effectively reduced by measures of reducing carbon equivalent, controlling segregation, refining grains and the like to improve the banded structure; meanwhile, controlled rolling, controlled cooling, stopping cooling at the temperature close to the phase change point and subsequent cooling path control are adopted, so that the center segregation can be reduced, and the sulfide corrosion resistance under large loading stress is improved.
Disclosure of Invention
The invention aims to provide a large-loading stress sulfide corrosion resistant X52MS hot-rolled coil and a manufacturing method thereof. The invention controls the technical parameters in the working procedures of smelting, continuous casting, rolling, cooling and the like, further controls the carbon equivalent, the number, the size and the form of inclusions of the hot-rolled coil, and simultaneously ensures good center segregation by reducing the addition of the segregation-prone elements.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the following chemical components in percentage by mass: c: 0.02 to 0.06%, Si: 0.05-0.30%, Mn: 0.95-1.45%, P is less than or equal to 0.015%, S is less than or equal to 0.0012%, Cr: 0.05 to 0.20%, Mo: 0.05 to 0.20%, Ti: 0.005-0.030%, Nb: 0.005-0.045%, Ca: 0.0010-0.0040%, N is less than or equal to 55ppm, and the balance is Fe and inevitable impurities; the fluctuation range of the carbon equivalent is less than or equal to 0.02 percent.
The X52MS hot-rolled plate coil has yield strength of 443-494MPa, tensile strength of 555-585MPa, A50mm: 32-46%, average transverse impact energy at-13 ℃ of 338-422J, and 100% of DWTT SA of shear surface of a drop hammer fracture at-3 ℃.
The invention also provides a manufacturing method of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion, which comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling; the slab casting process comprises a whole-course protective casting technology and dynamic soft reduction of the solidified tail end of a casting blank, wherein the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is ensured to be less than or equal to 1.0 level; the rolling procedure is controlled, wherein the rough rolling starting temperature is 1050-1150 ℃, the rough rolling finishing temperature is 950-1150 ℃, the finish rolling starting temperature is 900-1000 ℃, and the finish rolling finishing temperature is 820-860 ℃; and in the cooling control procedure, cooling is laminar intensive cooling, the cooling speed is controlled to be 25-35 ℃/s, and the cooling is carried out to 420-520 ℃.
In the slab casting process, the constant drawing speed of 1.0-1.2 m/min at the low superheat degree of 10-25 ℃ is adopted.
In the molten iron pretreatment process, the molten iron S after pretreatment is less than or equal to 0.005 percent.
In the converter smelting process, the converter smelting adopts bottom blowing argon blowing mode for blowing, large slag amount is melted in the whole process, the slag amount is strictly controlled, and the tapping P is less than or equal to 0.010 percent.
In the refining process, the bottom blowing flow is strictly controlled in the LF refining process, the single-way bottom blowing flow of the LF is controlled to be 200-500 NL/min in the slagging and heating stage, the large-turning effect is ensured in the strong stirring and desulfurizing stage, the single-way bottom blowing flow is more than or equal to 500NL/min, the opening of a dust removal valve in the treatment process is less than or equal to 50 percent, the micro-positive pressure in the furnace is ensured, and the S of the LF refining outlet station is less than or equal to 0.0012 percent.
In the refining process, RH vacuum treatment time is more than or equal to 15min, calcium treatment is carried out after vacuum is finished, Ca/S is more than or equal to 1.5, soft blowing time is more than or equal to 10min, and both the coarse system and the fine system of the B-type inclusion are less than or equal to 1.0 level.
In the slab heating process, the slab heating temperature is 1150-1250 ℃.
In the curling process, the coiling temperature is 420-520 ℃.
Standard reference API Spec 5L PSL2 (45) of large loading stress sulfide corrosion resistant X52MS hot rolled coil productthedition); the product performance test method is standard reference NACE TM 0177(latest ED.).
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention adopts the process idea of clean steel, reduces the addition of elements easy to segregate by reducing the C, Mn content in the design of chemical components, removes alloy elements such as Cr, V and the like, and adds a proper amount of Mo element to improve the strength of the product. 2. The invention improves the condition of center segregation by increasing the dynamic soft reduction of the solidified tail end of the casting blank, and improves the qualification rate of the sulfide corrosion detection of the large loading stress resistance. 3. According to the invention, by controlling the rolling and cooling processes, an acicular ferrite structure with a fine and uniform structure is obtained, the crack expansion under stress is further prevented, and the sulfide corrosion cracking resistance of the X52MS under large loading stress is improved. 4. The X52MS hot-rolled coil obtained by the method has yield strength of 443-494MPa, tensile strength of 555-585MPa, A50mm: 32-46%, average lateral impact work at-13 ℃ of 338-422J, and shear surface DWTT SA100% of drop hammer fracture at-3 ℃, and has good mechanical properties, and no stress corrosion cracking occurs under the condition that the load stress of the hot rolled plate coil is 90% of the actual yield strength of the material.
Drawings
FIG. 1 is a cross-sectional metallographic microstructure of a sulfide corrosion-resistant X52MS hot rolled steel sheet coil in accordance with example 1;
FIG. 2 is a schematic cross-sectional structure of example 1 after SSCC test of X52MS hot rolled steel sheet resisting large loading stress sulfide corrosion.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.004%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.007%;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 220NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 530NL/min, the opening of a dust removal valve in the treatment process is 40 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0010%; RH vacuum treatment time is 18min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 2.2, soft blowing time is 12min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a 15 ℃ low superheat degree, a 1.1m/min constant pulling speed and a full protection casting technology are adopted, the dynamic soft reduction of the solidified tail end of a casting blank is realized, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the heating temperature of the plate blank is 1186 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1091 ℃, the rough rolling finishing temperature is 1005 ℃, the finish rolling starting temperature is 982 ℃, and the finish rolling finishing temperature is 824 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 27 ℃, and the cooling is carried out to 465 ℃;
(8) curling step, coiling temperature 465 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
FIG. 1 is a structural view of the metallographic microstructure of a section of a large-loading stress sulfide corrosion resistant X52MS hot-rolled plate coil; FIG. 2 is a schematic cross-sectional structure of a large loading stress sulfide corrosion resistant X52MS hot rolled coil after SSCC test. (examples 2 to 7X 52MS Hot rolled coil resistant to sulfide Corrosion under heavy load X52. the cross-sectional microstructure of the coil was similar to that of FIG. 1, and the cross-sectional structure after SSCC test was similar to that of FIG. 2 and thus omitted.)
Example 2
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.003%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.008 percent;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 260NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 550NL/min, the opening of a dust removal valve in the treatment process is 30 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0009 percent; RH vacuum treatment time is 20min, calcium treatment is carried out after vacuum is finished, and Ca/S: 2.4, soft blowing time is 15min, and the coarse system and the fine system of the B-type inclusion are both 0.5 grade;
(4) a slab casting process, wherein a low superheat degree at 20 ℃, a constant pulling speed of 1.0m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 1.0 grade;
(5) a slab heating process: the slab heating temperature is 1189 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1099 ℃, the rough rolling finishing temperature is 1003 ℃, the finish rolling starting temperature is 988 ℃, and the finish rolling finishing temperature is 826 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 29 ℃, and the cooling is carried out to 471 ℃;
(8) curling process, coiling temperature 471 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 3
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.002%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.006%;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 300NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 570NL/min, the opening of a dust removal valve in the treatment process is 35 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0011%; RH vacuum treatment time is 16min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 2.1, soft blowing time is 11min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a 13 ℃ low superheat degree, a 1.2m/min constant pulling speed and a full protection casting technology are adopted, the dynamic soft reduction of the solidified tail end of a casting blank is realized, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the slab heating temperature is 1189 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1093 ℃, the rough rolling finishing temperature is 998 ℃, the finish rolling starting temperature is 980 ℃, and the finish rolling finishing temperature is 820 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 31 ℃, and the cooling is carried out to 458 ℃;
(8) curling process, coiling temperature 458 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 4
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.004%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.008 percent;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 320NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 600NL/min, the opening of a dust removal valve in the treatment process is 25 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0008 percent; RH vacuum treatment time is 17min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 2.2, soft blowing time is 13min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a low superheat degree at 17 ℃, a constant pulling speed of 1.1m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the slab heating temperature is 1188 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1094 ℃, the rough rolling finishing temperature is 1004 ℃, the finish rolling starting temperature is 990 ℃, and the finish rolling finishing temperature is 822 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 28 ℃, and the cooling is carried out to 460 ℃;
(8) curling process, coiling temperature 460 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 5
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.005 percent;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.010%;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 350NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 620NL/min, the opening of a dust removal valve in the treatment process is 30 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0012%; RH vacuum treatment time is 15min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 2.3, soft blowing time is 10min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a low superheat degree at 19 ℃, a constant pulling speed of 1.0m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the heating temperature of the plate blank is 1184 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1096 ℃, the rough rolling finishing temperature is 1002 ℃, the finish rolling starting temperature is 987 ℃, and the finish rolling finishing temperature is 830 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 30 ℃, and the cooling is carried out to 457 ℃;
(8) curling process, coiling temperature 457 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 6
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.003%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.005 percent;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 450NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 650NL/min, the opening of a dust removal valve in the treatment process is 40 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0009 percent; RH vacuum treatment time is 18min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 2.2, soft blowing time is 18min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a low superheat degree at 23 ℃, a constant pulling speed of 1.2m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the heating temperature of the plate blank is 1186 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1095 ℃, the rough rolling finishing temperature is 1000 ℃, the finish rolling starting temperature is 988 ℃, and the finish rolling finishing temperature is 825 ℃;
(7) a controlled cooling process: cooling to laminar flow intensive cooling, controlling the cooling speed to be 28 ℃, and cooling to 466 ℃;
(8) curling step, coiling temperature 466 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 7
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.0039%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.010%;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 200NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 500NL/min, the opening of a dust removal valve in the treatment process is 30 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0012%; RH vacuum treatment time is 15min, calcium treatment is carried out after vacuum is finished, and the conditions that Ca/S: 1.5, soft blowing time is 14min, and the coarse system and the fine system of the B-type inclusions are 0 grade and 0.5 grade respectively;
(4) a slab casting process, wherein a low superheat degree at 10 ℃, a constant pulling speed of 1.0m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the heating temperature of the plate blank is 1150 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1050 ℃, the rough rolling finishing temperature is 950 ℃, the finish rolling starting temperature is 900 ℃, and the finish rolling finishing temperature is 820 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 25 ℃, and the cooling is carried out to 420 ℃;
(8) curling process, coiling temperature 420 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Example 8
The chemical compositions and the mass percentage of the chemical compositions of the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion of the embodiment are shown in the table 1.
The manufacturing method of the large loading stress sulfide corrosion resistant X52MS hot rolled coil comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling, and comprises the following specific process steps:
(1) a molten iron pretreatment step, wherein the pretreated molten iron S: 0.003%;
(2) the converter smelting process adopts bottom argon blowing mode for converter smelting, large slag amount is melted in the whole process, the slag amount is strictly controlled, and steel P is tapped: 0.0086%;
(3) a refining procedure: the bottom blowing flow is strictly controlled in the LF refining process, in the slagging and heating stage, the LF single-way bottom blowing flow is controlled at 500NL/min, the strong stirring and desulfurizing stage ensures the large-turning effect, the single-way bottom blowing flow is 700NL/min, the opening of a dust removal valve in the treatment process is 48 percent, the micro-positive pressure in the furnace is ensured, and the LF refining is discharged from a station
S: 0.0009 percent; RH vacuum treatment time is 20min, calcium treatment is carried out after vacuum is finished, and Ca/S: 1.8, soft blowing time is 16min, the coarse system of the B-type inclusions is 0 grade, and the fine system is 1.0 grade;
(4) a slab casting process, wherein a low superheat degree at 25 ℃, a constant pulling speed of 1.2m/min, a full protection casting technology and a dynamic soft reduction at the solidification tail end of a casting blank are adopted, the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is 0.5 grade;
(5) a slab heating process: the heating temperature of the plate blank is 1250 ℃;
(6) and (3) controlling a rolling process: the rough rolling starting temperature is 1150 ℃, the rough rolling finishing temperature is 1150 ℃, the finish rolling starting temperature is 1000 ℃, and the finish rolling finishing temperature is 860 ℃;
(7) a controlled cooling process: cooling is laminar intensive cooling, the cooling speed is controlled to be 35 ℃, and the cooling is carried out to 520 ℃;
(8) curling step, coiling temperature 520 ℃.
The mechanical properties of the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil of the embodiment are shown in Table 2; the results of the sulfide stress corrosion resistance test are shown in Table 3.
Table 1 examples 1-8X 52MS hot rolled coil chemical composition and percent by mass (%)
Figure 964413DEST_PATH_IMAGE002
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 examples 1-8 mechanical properties of X52MS hot rolled coil resistant to high loading stress sulfide corrosion
Figure DEST_PATH_IMAGE004
From Table 2, the mechanical properties and sulfide stress corrosion properties of the X52MS hot rolled coil obtained in the example are shown: the yield strength is 443-.
In a typical test, the applied stress is calculated as 80% of the standard minimum yield strength, while this example tests a specimen load stress of 90% of the actual yield strength of the material, a four-point bend specimen is prepared according to ASTM G39 for a test time of 720 hours, three specimens are taken from each batch of specimens, and the test results are as follows:
table 3 examples 1-8X 52MS hot rolled coil sulfide stress corrosion resistance test results
Figure DEST_PATH_IMAGE006
As can be seen from Table 3, the X52MS hot rolled coil resisting large loading stress sulfide corrosion of the invention has no stress corrosion cracking under the loading stress of 90% of the actual yield strength of the material.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (9)

1. The X52MS hot-rolled plate coil capable of resisting large loading stress sulfide corrosion is characterized in that the X52MS hot-rolled plate coil comprises the following chemical components in percentage by mass: c: 0.02 to 0.06%, Si: 0.05-0.30%, Mn: 0.95-1.45%, P is less than or equal to 0.015%, S is less than or equal to 0.0012%, Cr: 0.05 to 0.20%, Mo: 0.05 to 0.20%, Ti: 0.005-0.030%, Nb: 0.005-0.045%, Ca: 0.0010-0.0040%, N is less than or equal to 55ppm, and the balance is Fe and inevitable impurities; the fluctuation range of the carbon equivalent is less than or equal to 0.02 percent; the yield strength of the X52MS hot-rolled plate coil is 443-494MPa, and the tensile strength is 555-585 MPa;
the hot rolled coil is manufactured by the following method: the method comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling; the slab casting process comprises a whole-course protective casting technology and dynamic soft reduction of the solidified tail end of a casting blank, wherein the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is ensured to be less than or equal to 1.0 level; the rolling procedure is controlled, wherein the rough rolling starting temperature is 1050-1150 ℃, the rough rolling finishing temperature is 950-1150 ℃, the finish rolling starting temperature is 900-1000 ℃, and the finish rolling finishing temperature is 820-860 ℃; in the cooling control procedure, cooling is laminar intensive cooling, the cooling speed is controlled to be 25-35 ℃/s, and the cooling is carried out to 420-520 ℃;
in the refining process, RH vacuum treatment time is more than or equal to 15min, calcium treatment is carried out after vacuum is finished, Ca/S is more than or equal to 1.5, soft blowing time is more than or equal to 10min, and both the coarse system and the fine system of the B-type inclusion are less than or equal to 1.0 level.
2. The high loading stress sulfide corrosion resistant X52MS hot rolled coil of claim 1, wherein the X52MS hot rolled coil A50mm: 32-46%, average transverse impact energy at-13 ℃ of 338-422J, and 100% of DWTT SA of shear surface of a drop hammer fracture at-3 ℃.
3. The manufacturing method of the X52MS hot-rolled coil resistant to the sulfide corrosion of the large loading stress according to claim 1 or 2, characterized in that the manufacturing method comprises the working procedures of molten iron pretreatment, converter smelting, refining, slab casting, slab heating, controlled rolling, controlled cooling and curling; the slab casting process comprises a whole-course protective casting technology and dynamic soft reduction of the solidified tail end of a casting blank, wherein the reduction is adjusted from 6mm to 8mm, and the class C center segregation of the casting blank is ensured to be less than or equal to 1.0 level; the rolling procedure is controlled, wherein the rough rolling starting temperature is 1050-1150 ℃, the rough rolling finishing temperature is 950-1150 ℃, the finish rolling starting temperature is 900-1000 ℃, and the finish rolling finishing temperature is 820-860 ℃; in the cooling control procedure, cooling is laminar intensive cooling, the cooling speed is controlled to be 25-35 ℃/s, and the cooling is carried out to 420-520 ℃;
in the refining process, RH vacuum treatment time is more than or equal to 15min, calcium treatment is carried out after vacuum is finished, Ca/S is more than or equal to 1.5, soft blowing time is more than or equal to 10min, and both the coarse system and the fine system of the B-type inclusion are less than or equal to 1.0 level.
4. The method for manufacturing the X52MS hot-rolled plate coil resisting the large loading stress sulfide corrosion according to claim 3, wherein the slab casting process adopts a low superheat degree at 10-25 ℃ and a constant drawing speed of 1.0-1.2 m/min.
5. The method for manufacturing the X52MS hot-rolled sheet coil resisting the large loading stress sulfide corrosion according to claim 3, wherein in the molten iron pretreatment step, the S content of the pretreated molten iron is less than or equal to 0.005%.
6. The method for manufacturing the X52MS hot-rolled sheet coil resisting the large loading stress sulfide corrosion according to any one of claims 3-5, wherein the converter smelting process adopts bottom blowing argon mode blowing, the slag is fully melted in large slag amount, the slag amount is strictly controlled, and the tapping P is less than or equal to 0.010%.
7. The method for manufacturing the X52MS hot-rolled sheet coil resisting the large loading stress sulfide corrosion according to any one of claims 3-5, wherein in the refining process, the bottom blowing flow rate is strictly controlled in the LF refining process, in the slagging and heating stage, the single-way bottom blowing flow rate of the LF is controlled to be 200-500 NL/min, in the strong stirring and desulfurization stage, the large overturning effect is ensured, the single-way bottom blowing flow rate is more than or equal to 500NL/min, the opening degree of a dust removal valve in the treatment process is less than or equal to 50%, the micro positive pressure in the furnace is ensured, and the S of the LF refining station is less than or equal to 0.001.
8. The method for manufacturing the X52MS hot-rolled coil resisting the large loading stress sulfide corrosion according to any one of claims 3-5, wherein the slab heating temperature in the slab heating process is 1150-1250 ℃.
9. The method for manufacturing the large loading stress sulfide corrosion resistant X52MS hot rolled plate coil according to any one of claims 3-5, wherein the coiling temperature in the coiling process is 420-520 ℃.
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