CN114959496A - Production method of container steel Q345R resistant to hydrogen sulfide corrosion - Google Patents

Production method of container steel Q345R resistant to hydrogen sulfide corrosion Download PDF

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Publication number
CN114959496A
CN114959496A CN202210727370.XA CN202210727370A CN114959496A CN 114959496 A CN114959496 A CN 114959496A CN 202210727370 A CN202210727370 A CN 202210727370A CN 114959496 A CN114959496 A CN 114959496A
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steel
temperature
furnace
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吴进
周文浩
罗登
史术华
张计谋
王振
汪后明
徐琛
刘立彪
龙安辉
王超
谭小斌
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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Hunan Valin Xiangtan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • C21D2211/002—Bainite
    • 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
    • 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

Abstract

The invention discloses a production method of container steel Q345R resistant to hydrogen sulfide corrosion, which comprises the following process flows of converter smelting, LF + VD refining, continuous casting, heating rolling, quenching + tempering heat treatment, inspection and warehousing, wherein the chemical compositions of the steel comprise, by mass, 0.15-0.20% of carbon, 0.15-0.35% of silicon, 1.20-1.30% of manganese, less than or equal to 0.008% of phosphorus, less than or equal to 0.0015% of sulfur, less than or equal to 0.020% of niobium, less than or equal to 0.010% of titanium, less than or equal to 0.0005% of boron, 0.020-0.060% of aluminum, 0.10-0.15% of copper and the balance of Fe and inevitable impurities. The steel plate has the properties of 350-500 MPa yield strength, 510-600 MPa tensile strength, -30 ℃ low-temperature impact toughness, Akv more than or equal to 100J, excellent comprehensive structure properties including lamellar tearing resistance, hardness, structure grain size, inclusion and the like, and hydrogen induced cracking resistance and H resistance in various delivery states, simulated heat treatment, simulated heat forming and heat simulation states 2 The S stress corrosion cracking performance detection result is good.

Description

Production method of container steel Q345R resistant to hydrogen sulfide corrosion
Technical Field
The invention belongs to the technical field of steel production, and relates to a production method of container steel Q345R resistant to hydrogen sulfide corrosion.
Background
With the rapid development of world economy, the energy demand is continuously increased, the steel for transportation and storage of oil and gas resources is increasingly required, and the production, storage and transportation of various oil and gas resources and the development of ocean engineering and cold regions all put strict requirements on the performance of container steel. The pressure vessel is usually in a sealed state, and the inside or the outside of the pressure vessel needs to bear high temperature, high pressure, corrosion and embrittlement, different environments and other influences, so that accidents such as leakage, combustion or explosion and the like are easy to happen, and personnel, equipment and the natural environment are endangered. In order to meet the requirements of manufacturing and production of the pressure vessel and use safety in different environments, the special steel for the pressure vessel has to have higher comprehensive performances of pressure resistance, temperature resistance and corrosion resistance, including strength, impact toughness, welding performance, corrosion resistance and the like.
Disclosure of Invention
The invention aims to provide a production method of hydrogen sulfide corrosion resistant container steel Q345R, which has the performance of 350-500 MPa yield strength, 510-600 MPa tensile strength, minus 30 ℃ low-temperature impact toughness, Akv more than or equal to 100J, excellent comprehensive structure performance including lamellar tearing resistance, hardness, tissue grain size, inclusion and the like, hydrogen induced cracking resistance and H corrosion resistance under various delivery states, simulated heat treatment, simulated thermoforming and thermal simulation states of a steel plate 2 The S stress corrosion cracking performance detection result is good.
The invention is realized by the following technical scheme:
a production method of container steel Q345R resistant to hydrogen sulfide corrosion comprises the following process flows of converter smelting, LF + VD refining, continuous casting, heating rolling, quenching + tempering heat treatment, inspection and warehousing. The steel comprises, by mass, 0.15-0.20% of carbon, 0.15-0.35% of silicon, 1.20-1.30% of manganese, 0.008% or less of phosphorus, 0.0015% or less of sulfur, 0.020% or less of niobium, 0.010% or less of titanium, 0.0005% or less of boron, 0.020% or more-0.060% of aluminum, 0.10-0.15% of copper, and the balance of Fe and inevitable impurities; the key process steps comprise:
(1) converter: the method is operated by adopting a high-alkalinity, high-oxidability and low-temperature slag system, the oxygen content of the converter is controlled to be more than or equal to 450ppm, slag and steel are blocked and tapped, aluminum deoxidation is not carried out, and 1.5-2.5 kg/t of steel lime is added behind the converter;
(2) refining: slagging off after the LF furnace is heated for slagging, adding lime and refined slag charge, and adding alkalinity CaO/SiO 2 = 4.5-6.0, deoxidizing, desulfurizing and alloying, controlling inclusions in molten steel by calcification treatment before leaving the station, and keeping the vacuum for more than 15 minutes by controlling a VD furnace under the condition of working vacuum degree of 0.5 tor; performing denitrification, hydrogen and oxygen treatment on the molten steel, wherein the hydrogen content is less than or equal to 1.5ppm, and the oxygen content is less than or equal to 20 ppm;
(3) continuous casting: the casting is protected by low superheat degree, the superheat degree is controlled to be 6-13 ℃, dynamic water distribution cooling is adopted for secondary cooling, the center segregation and the looseness of the casting blank are reduced by adopting a dynamic soft reduction technology, the casting blank is subjected to secondary cold flame cutting, stacking and slow cooling, and the cold blank is charged into a furnace for rolling;
(4) rolling: heating at the temperature of 1160-1200 ℃, heating for 280-320 min, keeping the blank thickness at the temperature of not less than 2.5h, rolling at the initial temperature of 840-950 ℃, and rolling at the final temperature of 760-820 ℃;
(5) and (3) heat treatment: the quenching temperature is 870-910 ℃, and the in-furnace time is 1.5-2.0 min/mm; tempering at 650-720 ℃ for 2.5-3.0 min/mm in the furnace.
The principle of the invention is as follows:
and (2) regarding the step (1), stirring a molten pool by using large oxygen jet flow to produce high-alkalinity slag, so that the oxygen content of the steel is more than or equal to 450ppm and P is less than or equal to 0.008, reducing the mixing of high-oxidation slag by adopting slag-stopping steel tapping, not deoxidizing and alloying, keeping the high oxygen content of molten steel, and adding 1.5-2.5 kg/t of steel lime after the furnace, thereby creating conditions for subsequent refining.
In the step (2), the LF furnace is heated to melt slag and further remove P, the P after slag removal is less than or equal to 0.004 percent, lime and refined slag are adopted for deoxidation and desulfurization to produce high-alkalinity fluidity slag, and the alkalinity of the refined slag is CaO/SiO 2 Not more than 4.5 to 6.0, controlling inclusions in molten steel by calcification treatment before leaving the station, carrying out vacuum treatment by a VD furnace, and carrying out denitrification, hydrogen and oxygen treatment on the molten steel, wherein the hydrogen content is not more than 1.5ppm, and the oxygen content is not more than 20 ppm.
Regarding the step (3), continuous casting adopts low superheat degree protective casting, the production of secondary oxides can be effectively reduced through the whole protective casting, the superheat degree is controlled to be 6-13 ℃, a continuous casting secondary cooling dynamic water distribution technology, a solidification end three-section dynamic soft reduction technology and a reduction of 7-9 mm are adopted, the formation of a central bridge chain is reduced, the central segregation and the porosity are reduced, and the central segregation is less than or equal to 1.5 grade; after the casting blank is cut by flame, the casting blank quenching device quenches to be less than or equal to 600 ℃, the casting blank is slowly cooled and uniform in casting blank structure, and the casting blank structure is further stable.
And (4) heating at the temperature of 1160-1200 ℃, wherein the size of the microalloy carbonitride tends to be stable, austenite grains grow normally and are gradually uniform, and the grains are further crushed by matching with high-pressure rolling to be refined.
Regarding the step (5), the quenching temperature is 870-910 ℃, the furnace time is 1.5-2.0 min/mm, the steel is discharged from the furnace and is accelerated by water, the austenite structure is transformed into ferrite and bainite at a higher temperature, the crystal grains are finer, and the zonal segregation is obviously reduced; tempering at 650-720 ℃, wherein the furnace time is 2.5-3.0 min/mm, and tempering to obtain a tempered bainite and a small amount of ferrite structure, thereby reducing the stress corrosion cracking sensitivity.
The invention has the advantages that: the production flow is simple, the alloy cost is low, and the addition of a proper amount of Cu can improve the strength of the steel to a certain extent and can also improve the tempering stability of the steel in the simulated post-welding heat treatment. Through the P removing technology of adding lime for slagging and slagging off after the furnace, the traditional molten iron pretreatment process is omitted, the working procedures are reduced, the production cost is saved, the blowing pressure of the converter is reduced, the converter lining is protected, the service life of the converter is prolonged, and meanwhile, the P content of a finished product is stably controlled to be less than or equal to 0.008%. The quenching and chilling of the continuous casting blank and the slow cooling of the reactor make the casting blank structure finer and more uniform. The heat treatment technology of quenching and tempering of the steel plate obtains a stable bainite and ferrite structure, and improves the hydrogen induced cracking resistance and H resistance of the steel plate 2 S stress corrosion cracking performance. The Q345R steel plate produced by the method has uniform and stable steel plate performance, good hot forming and die welding performance, and excellent hydrogen induced cracking resistance and H resistance 2 S stress corrosion cracking performance, the yield strength of the steel plate is 350-500 MPa, the tensile strength is 510-600 MPa, the low-temperature impact toughness is-40 ℃, Akv is more than or equal to 100J, and various coarse/fine inclusions of A, B, C, D are less than or equal to 1.0 grade,other comprehensive structure performances such as lamellar tearing resistance, hardness, structure grain size and the like are all excellent.
Drawings
FIG. 1 is a metallographic structure diagram of a steel plate.
Detailed Description
The invention is further illustrated by the following examples:
example 1: production of 12mm hydrogen sulfide corrosion resistant Q345R container steel
The chemical composition weight percentage of the alloy elements is carbon =0.18%, silicon =0.28%, manganese =1.24%, phosphorus =0.005%, sulfur =0.0009%, niobium =0.003%, titanium =0.002%, boron =0.0005%, aluminum =0.03%, copper =0.12%, and the balance of iron and inevitable impurities, and the key process steps are as follows:
(1) smelting in a converter: the oxygen content of the converter tapping is 516ppm, the phosphorus content is 0.0074%, argon stirring is controlled after the converter tapping, the argon flow is 10L/min, lime is added, and the P removal reaction further occurs;
(2) refining in an LF furnace: the process comprises the steps of (1) entering a station, raising the temperature, continuously carrying out dephosphorization reaction, slagging off to about 1580 ℃, sampling phosphorus content to be 0.022%, adding lime and refined slag charge, making high-alkalinity flowing slag, deoxidizing, desulfurizing, removing impurities, adjusting alloy components, exiting the station, feeding a calcium line for 300m, carrying out molten steel calcification treatment, then carrying out VD vacuum treatment, and keeping vacuum for 15 minutes under the vacuum of 0.5 tor; the molten steel is subjected to denitrification, hydrogen and oxygen treatment, the hydrogen content is less than or equal to 1.5PPm, argon is blown in the whole process, floating and removal of impurities are facilitated, the purity of the molten steel is greatly improved, and the grade A coarse and fine system is 0; class B coarse/fine 0; class C coarse/fine 0; class D coarse/fine 0.5 grade;
(3) continuous casting: the superheat degree is 8-11 ℃, the ratio of water to secondary cooling water in continuous casting is 0.18L/kg, three sections of dynamic soft reduction technology at the solidification end are reduced by 7mm, the formation of a center bridge chain is reduced, the center segregation and the porosity are reduced, and the center segregation is graded by 1.0; after flame cutting, a casting blank quenching device quenches 580 ℃, and after offline slow cooling, furnace rolling is carried out;
(4) rolling: heating at the temperature of 1160-1200 ℃, heating for 290min, keeping the blank thickness at 50mm, the initial rolling temperature at 930 ℃, and the final rolling temperature at 770-810 ℃;
(5) and (3) heat treatment: the quenching temperature is 870 ℃, the furnace time is 23min, the furnace discharge adopts water to accelerate cooling, the tempering is 710 ℃, the furnace time is 36min/, and the steel plate structure is tempered bainite and a small amount of ferrite.
The results of the property measurements of the steels are shown in Table 1.
TABLE 112 mmQ345R (R-HIC) vessel Steel Performance Table
Figure 688763DEST_PATH_IMAGE001
。
Example 2: production of 58mm hydrogen sulfide corrosion resistant Q345R container steel
The chemical composition weight percentage of the alloy elements is carbon =0.18%, silicon =0.32%, manganese =1.26%, phosphorus = 0.004%, sulfur =0.0015%, niobium =0.005%, titanium =0.002%, boron =0.0005%, aluminum =0.022%, copper =0.12%, and the balance of iron and inevitable impurities, and the key process steps are as follows:
(1) smelting in a converter: the oxygen content of the converter tapping is 498ppm, the phosphorus content is 0.007%, argon stirring is controlled after the converter tapping, the argon flow is 10L/min, lime is added, and the P removal reaction further occurs;
(2) refining in an LF furnace: the process comprises the steps of (1) entering a station, raising the temperature, continuously carrying out dephosphorization reaction, slagging off at about 1580 ℃, sampling 0.019% of phosphorus, adding lime and refined slag, making high-alkalinity fluidity slag, deoxidizing, desulfurizing, removing impurities, adjusting alloy components, exiting the station, feeding a calcium wire for 300m, carrying out molten steel calcification treatment, then carrying out VD vacuum treatment, and keeping the vacuum for 15 minutes under the vacuum of 0.5 tor; the molten steel is subjected to denitrification, hydrogen and oxygen treatment, the hydrogen content is less than or equal to 1.5PPm, argon is blown in the whole process, floating and removal of impurities are facilitated, the purity of the molten steel is greatly improved, and A-type coarse/fine system is 0 grade; class B coarse/fine 0; class C coarse/fine 0; class D coarse/fine 1.0 grade;
(3) continuous casting: controlling the superheat degree to be 6-10 ℃, controlling the water ratio of continuous casting secondary cooling water distribution to be 0.18L/kg, and adopting a three-section dynamic soft reduction technology at the solidification end, wherein the reduction is 7mm, so that the formation of a center bridge chain is reduced, the center segregation and the porosity are reduced, and the center segregation is 0.5 grade; after flame cutting, a casting blank quenching device quenches 580 ℃, and after offline slow cooling, furnace charging and rolling are carried out on the casting blank;
(4) rolling: heating at the temperature of 1160-1200 ℃, heating for 300min, keeping the blank thickness at 160mm, the initial rolling temperature at 840 ℃, and the final rolling temperature at 770-810 ℃;
(5) and (3) heat treatment: the quenching temperature is 890 ℃, the furnace time is 87min, the steel plate is taken out of the furnace and is accelerated by water to be cooled, the tempering is 680 ℃, the furnace time is 174min/, and the steel plate structure is tempered bainite and a small amount of ferrite.
The results of the property measurements of the steels are shown in Table 2.
TABLE 258 mmQ345R (R-HIC) vessel Steel Performance Table
Figure 503135DEST_PATH_IMAGE002
。

Claims (1)

1. A production method of container steel Q345R resistant to hydrogen sulfide corrosion comprises the following process flows of converter smelting, LF + VD refining, continuous casting, heating rolling, quenching + tempering heat treatment, inspection and warehousing, and is characterized in that: the steel comprises, by mass, 0.15-0.20% of carbon, 0.15-0.35% of silicon, 1.20-1.30% of manganese, 0.008% or less of phosphorus, 0.0015% or less of sulfur, 0.020% or less of niobium, 0.010% or less of titanium, 0.0005% or less of boron, 0.020% or more-0.060% of aluminum, 0.10-0.15% of copper, and the balance of Fe and inevitable impurities; the key process steps comprise:
(1) converter: the method is operated by adopting a high-alkalinity, high-oxidability and low-temperature slag system, the oxygen content of the converter is controlled to be more than or equal to 450ppm, slag and steel are blocked and tapped, aluminum deoxidation is not carried out, and 1.5-2.5 kg/t of steel lime is added behind the converter;
(2) refining: slagging off after the LF furnace is heated for slagging, adding lime and refined slag charge, and adding alkalinity CaO/SiO 2 = 4.5-6.0, deoxidizing, desulfurizing and alloying, controlling inclusions in molten steel by calcification treatment before leaving the station, and keeping the vacuum for more than 15 minutes by controlling a VD furnace under the condition of working vacuum degree of 0.5 tor; performing denitrification, hydrogen and oxygen treatment on the molten steel, wherein the hydrogen content is less than or equal to 1.5ppm, and the oxygen content is less than or equal to 20 ppm;
(3) continuous casting: the casting is protected by low superheat degree, the superheat degree is controlled to be 6-13 ℃, dynamic water distribution cooling is adopted for secondary cooling, the center segregation and the looseness of the casting blank are reduced by adopting a dynamic soft reduction technology, the casting blank is subjected to secondary cold flame cutting, stacking and slow cooling, and the cold blank is charged into a furnace for rolling;
(4) rolling: heating at the temperature of 1160-1200 ℃, heating for 280-320 min, keeping the blank thickness at the temperature of not less than 2.5h, rolling at the initial temperature of 840-950 ℃, and rolling at the final temperature of 760-820 ℃;
(5) and (3) heat treatment: the quenching temperature is 870-910 ℃, and the in-furnace time is 1.5-2.0 min/mm; tempering at 650-720 ℃ for 2.5-3.0 min/mm in the furnace.
CN202210727370.XA 2022-06-25 2022-06-25 Production method of container steel Q345R resistant to hydrogen sulfide corrosion Pending CN114959496A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116970865A (en) * 2023-07-22 2023-10-31 湖南华菱湘潭钢铁有限公司 Production method of aluminum-free pipe fitting steel Q555PF

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Publication number Priority date Publication date Assignee Title
CN101701276A (en) * 2009-11-25 2010-05-05 天津钢铁集团有限公司 Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process
CN108330398A (en) * 2018-05-22 2018-07-27 湖南华菱湘潭钢铁有限公司 A kind of production method of special thick antiacid tank plate
CN113186455A (en) * 2021-03-30 2021-07-30 湖南华菱湘潭钢铁有限公司 Production method of high-strength steel plate for nuclear energy safety container

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101701276A (en) * 2009-11-25 2010-05-05 天津钢铁集团有限公司 Method for smelting steel round blank of pipeline with hydrogen sulfide corrosion resistance by convertor process
CN108330398A (en) * 2018-05-22 2018-07-27 湖南华菱湘潭钢铁有限公司 A kind of production method of special thick antiacid tank plate
CN113186455A (en) * 2021-03-30 2021-07-30 湖南华菱湘潭钢铁有限公司 Production method of high-strength steel plate for nuclear energy safety container

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116970865A (en) * 2023-07-22 2023-10-31 湖南华菱湘潭钢铁有限公司 Production method of aluminum-free pipe fitting steel Q555PF

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