CN111394653A - 420MPa low-carbon easy-welding marine structural steel plate and manufacturing method thereof - Google Patents

420MPa low-carbon easy-welding marine structural steel plate and manufacturing method thereof Download PDF

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CN111394653A
CN111394653A CN202010304117.4A CN202010304117A CN111394653A CN 111394653 A CN111394653 A CN 111394653A CN 202010304117 A CN202010304117 A CN 202010304117A CN 111394653 A CN111394653 A CN 111394653A
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temperature
steel plate
rolling
carrying
converter
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冯勇
吴俊平
潘中德
霍松波
李伟
赵柏杰
洪君
靳星
刘继宏
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Nanjing Iron and Steel Co Ltd
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Nanjing 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • 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
    • C22C38/002—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
    • C22C38/04—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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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

Abstract

The invention discloses a 420MPa low-carbon easy-welding marine structure steel plate and a manufacturing method thereof, relating to the technical field, wherein the steel plate comprises the following chemical components in percentage by mass: the thickness of the steel plate is 10-100mm, C: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.00-1.90%, P less than 0.015%, S less than 0.010%, Cr: 0 to 0.50%, Ni 0 to 1.20%, Mo: 0-0.65%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%. The produced product with the specification of 10-100mm has high low-temperature toughness, low carbon equivalent, easy welding, good seawater corrosion resistance and greatly improved safety.

Description

420MPa low-carbon easy-welding marine structural steel plate and manufacturing method thereof
Technical Field
The invention relates to the technical field of steel smelting, in particular to a 420MPa low-carbon easy-welding marine structural steel plate and a manufacturing method thereof.
Background
The utilization and development of marine resources have promoted the great development of marine structures, such as oil and gas development and exploitation and offshore wind power utilization. The ocean is very complicated and variable due to the regions, climate and sea conditions, and the steel for building the ocean structure is required to have high strength, good toughness, easy welding, seawater corrosion resistance and good fatigue performance and even tear resistance, which puts high requirements on the development and production of steel mill products. Most of the traditional 420 MPa-level steel plates are produced by adopting a quenching and tempering process, and have the problems of large alloy amount, long process flow, high cost, poor welding performance and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides a 420MPa low-carbon easy-welding marine structure steel plate which comprises the following chemical components in percentage by mass: the thickness of the steel plate is 10-100mm, C: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.00-1.90%, P less than 0.015%, S less than 0.010%, Cr: 0 to 0.50%, Ni 0 to 1.20%, Mo: 0-0.65%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
The technical effects are as follows: the invention adopts a design with lower carbon and lower carbon equivalent, the alloy composition is mainly designed to be quickly cooled after controlled rolling to form a fine lath bainite structure, good mechanical property and fatigue property are obtained, the welding and toughness improvement of a steel plate with the specification of 10-100mm are facilitated, and the produced product with the specification of 10-100mm is easy to weld and is corrosion-resistant, and the repeated impact swinging stress and stress corrosion of sea storms can be resisted.
The technical scheme of the invention is further defined as follows:
the 420MPa low-carbon easy-welding marine structure steel plate comprises the following chemical components in percentage by mass: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.20-1.80%, P less than 0.015%, S less than 0.005%, Cr: 0 to 0.50%, Ni 0 to 1.10%, Mo: 0-0.55%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
The 420MPa low-carbon easy-welding marine structure steel plate comprises the following chemical components in percentage by mass: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.10-1.80%, P less than 0.015%, S less than 0.006%, Cr: 0 to 0.50%, Ni 0 to 1.10%, Mo: 0-0.65%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
The 420MPa low-carbon easy-welding marine structure steel plate comprises the following chemical components in percentage by mass: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.10-1.80%, P less than 0.015%, S less than 0.005%, Cr: 0 to 0.50%, Ni 0 to 1.20%, Mo: 0-0.55%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
The invention also aims to provide a manufacturing method of the 420MPa low-carbon easy-welding marine structural steel plate, which comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification and finished product forming,
the method comprises the steps of pretreating molten iron, wherein S in the molten iron is less than 0.010%, smelting in a BOF converter, deoxidizing and alloying after the furnace, refining for 15-30 min outside the L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1560-1600 ℃, carrying out RH vacuum degassing treatment for 15-30 min, blowing argon from the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen and oxygen, feeding a calcium wire to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protective casting in the whole process, carrying out electromagnetic stirring at a pulling speed of 0.75-1.2 m/min, uniformly heating a plate blank at 1150-1250 ℃, carrying out heating for 3.5-4.5 h, carrying out two-stage rolling by a four-roller reversible rolling mill, controlling the rolling reduction rate to be more than 60%, carrying out rough rolling at the initial temperature of 1070-1220 ℃, carrying out the second-stage rolling at the final rolling temperature of 780-860 ℃, controlling cooling, carrying out the steel plate at the red returning temperature of 250-460 ℃, carrying out straightening temperature of 1-6mm/m by.
The technical scheme of the invention is further defined as follows:
the manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate comprises the following steps of forming the steel plate with the thickness of 100mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.08%, Si: 0.31%, Mn: 1.53%, P: 0.011%, S: 0.001%, Cr: 0.25%, Ni 0.95%, Mo: 0.33%, Cu: 0.22%, Nb 0.026%, V: 0.055%, Ti: 0.025%, B: 0.0023%, Al: 0.032%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, carrying out RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protection casting in the whole process at a pulling speed of 0.90m/min, carrying out electromagnetic stirring, uniformly heating a plate blank again for 4.2h, carrying out two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 63 percent, the rough rolling starting temperature is 1120 ℃, the two-stage starting temperature is 890 ℃, the final rolling temperature is 780 ℃, the steel plate re-reddening temperature is 350 ℃, the unevenness of a nine-roll straightener is 3mm/m, carrying out tempering for 2h at 500 ℃, marking and inspecting finished products, and warehousing after.
The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate comprises the following steps of (1) forming the steel plate with the thickness of 80mm, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.27%, Mn: 1.50%, P: 0.013%, S: 0.002%, Cr: 0.26%, Ni 0.78%, Mo: 0.29%, Cu: 0.21%, Nb:0.027%, V: 0.41%, Ti: 0.020%, B: 0.0019%, Al: 0.028%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside an L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, performing argon protection casting in the whole process at a drawing speed of 0.86m/min, electromagnetically stirring, uniformly heating a plate blank at 1190 ℃ for 4.3h, rolling by a four-roll reversible rolling mill in two stages, wherein the rolling reduction rate is 63 percent, the rough rolling starting temperature is 1150 ℃, the secondary starting temperature is 890 ℃, the final rolling temperature is 790 ℃, the starting temperature is 760 ℃, the steel plate re-reddening temperature is 330 ℃, the straightening unevenness of a nine-roll straightener is 3mm/m, tempering at 520 ℃ for 2h, marking and inspecting finished products, and warehousing qualified products.
The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate comprises the following steps of (1) 50mm in thickness: c: 0.07%, Si: 0.31%, Mn: 1.53%, P: 0.011%, S: 0.001%, Cr: 0.20%, Ni 0.68%, Mo: 0.30%, Cu: 0.23%, Nb:0.028%, V: 0.035%, Ti: 0.025%, B: 0.0021%, Al: 0.023%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel and spheroidize the nonmetallic inclusions, performing argon protection casting in the whole process at a drawing speed of 0.85m/min, electromagnetically stirring, uniformly heating a plate blank again for 4.2h, performing two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 62 percent, the rough rolling start rolling temperature is 1120 ℃, the two-stage start rolling temperature is 890 ℃, the finish rolling temperature is 790 ℃, the start cooling temperature is 755 ℃, the steel plate re-reddening temperature is 350 ℃, the unevenness of a nine-roll straightener is 3mm/m, tempering for 2h at 520 ℃, marking and inspecting finished products, and warehousing.
The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate comprises the following steps of (1) forming the steel plate with the thickness of 20mm, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.015%, S: 0.001%, Cr: 0.20%, Ni 0.40%, Mo: 0.18%, Cu: 0.20%, Nb 0.023%, V: 0.033%, Ti: 0.026%, B: 0.0021%, Al: 0.026%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, carrying out RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protection casting in the whole process at a pulling speed of 0.90m/min, carrying out electromagnetic stirring, uniformly heating a plate blank at 1185 ℃ for 4.3h, carrying out two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 62 percent, the rough rolling starting temperature is 1160 ℃, the two-stage starting temperature is 890 ℃, the final rolling temperature is 810 ℃, the starting cooling temperature is 750 ℃, the steel plate re-redding temperature is 350 ℃, straightening unevenness is 3mm/m by a nine-roll straightening machine, carrying out tempering for 2h at 520.
The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate comprises the following steps of (1) forming the steel plate with the thickness of 10mm, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.06%, Si: 0.28%, Mn: 1.52%, P: 0.014%, S: 0.003%, Cr: 0.18%, Ni 0.40%, Mo: 0.17%, Cu: 0.21%, Nb:0.023%, V: 0.028%, Ti: 0.023%, B: 0.0020%, Al: 0.025 percent;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside an L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel and spheroidize the nonmetallic inclusions, performing argon protection casting in the whole process, wherein the drawing speed is 0.85m/min, performing electromagnetic stirring, uniformly heating a plate blank at 1220 ℃, heating time is 4.2h, performing two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 63 percent, the rough rolling start rolling temperature is 1180 ℃, the two-stage start rolling temperature is 890 ℃, the finish rolling temperature is 860 ℃, the start cooling temperature is 760 ℃, the steel plate return red temperature is 370 ℃, straightening unevenness of a nine-roll straightener is 3mm/m, tempering for 2h at 520 ℃, marking and inspecting finished products.
The invention has the beneficial effects that:
(1) the product of the invention is optimized and tempered, the steel plate has good shape, is not deformed during cutting, has the yield strength of more than 420MPa and the low-temperature impact toughness of-40 ℃ of more than 60 joules, has high low-temperature toughness, low carbon equivalent, easy welding, good seawater corrosion resistance and greatly improved safety, can adapt to the requirements of complex structural stress, large steel plate size, outstanding low-temperature toughness and the like of modern ocean engineering, is beneficial to promoting the manufacturing progress of the modern ocean engineering structure for producing oil and gas at sea bottom and ensuring safe long-term operation, and has advanced technical and economic indexes;
(2) the product of the invention is treated by a tempering process, the comprehensive performance of the steel plate is more stable, the problems of large blanking deformation of customers and the like are solved, and a proper amount of chromium and copper is added into the steel, so that the seawater corrosion resistance is favorably improved, the integral service life and the operation period of the platform structure are prolonged, and the cost is reduced;
(3) the product of the invention is in a 10-100mm specification urgently needed by the market, the ton steel gross profit reaches more than 1200 yuan, the economic and social benefits are very obvious, low-grade materials of 235MPa and 345MPa are replaced, steel and welding materials are saved, the logistics and installation cost is saved, the upgrading and updating of metallurgical products and marine steel structure products in China are realized, the low-end product quality with large promotion amount and wide range is improved, and the development prospect of the quality benefit is wide;
(4) the invention adopts the design of lower carbon and lower carbon equivalent, the alloy composition is mainly designed to be quickly cooled after controlled rolling to form a fine lath bainite structure, good mechanical property and fatigue property are obtained, the welding and toughness improvement of a steel plate with the specification of 10-100mm are facilitated, the produced product with the specification of 10-100mm is easy to weld, the corrosion resistance is improved by proper chromium content, and the invention is suitable for offshore complex working condition operation.
Detailed Description
Example 1
The 420MPa low-carbon easy-welding marine structure steel plate provided by the embodiment is a 100mm specification S420M L (S420M L O/S420G2+ M) steel plate, and comprises the following chemical components, by mass, 0.08% of C, 0.31% of Si, 1.53% of Mn, 0.011% of P, 0.001% of S, 0.25% of Cr, 0.95% of Ni, 0.33% of Mo, 0.22% of Cu, 0.026% of Nb, 0.055% of V, 0.025% of Ti, 0.0023% of B and 0.032% of Al.
The manufacturing method comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification, and finished product inspection, wherein the S content in molten iron after molten iron pretreatment is 0.010%, converter BOF smelting and furnace deoxidation alloying are carried out, L F external refining is carried out for 25min, alloy components are finely adjusted, the temperature of molten steel reaches 1580 ℃, RH vacuum degassing treatment is carried out for 30min, argon is blown at the bottom, stirring and floating upward are carried out to remove nonmetallic inclusions, the content of nitrogen, hydrogen and oxygen is reduced, calcium wires are fed to purify molten steel and spheroidized nonmetallic inclusions, argon protection pouring is carried out in the whole process, the drawing speed is 0.90m/min, electromagnetic stirring is carried out, the slab is uniformly heated for 1170 ℃, the heating time is 4.2h, two-stage rolling is carried out by a four-roller reversible rolling mill, the rolling reduction rate is 63%, the rough rolling start temperature is 1120 ℃, the start rolling start temperature at the end rolling temperature of 890 ℃, the finish rolling temperature is 780 ℃, the start of the annealing temperature is 755 ℃, the steel plate return to red temperature is 350 ℃.
The mechanical properties of the steel plate are as follows: the yield strength is 480MPa, the tensile strength is 650MPa, the elongation is 22 percent, and the impact energy at 40 ℃ below zero is 286J, 295J and 293J (10 x 10mm at the center of the plate thickness).
Example 2
The 420MPa low-carbon easy-welding marine structure steel plate provided by the embodiment is an 80mm specification S420M L (S420M L O/S420G2+ M) steel plate, and comprises the following chemical components, by mass, 0.07% of C, 0.27% of Si, 1.50% of Mn, 0.013% of P, 0.002% of S, 0.26% of Cr, 0.78% of Ni, 0.29% of Mo, 0.21% of Cu, 0.027% of Nb, 0.41% of V, 0.020% of Ti, 0.0019% of B and 0.028% of Al.
The manufacturing method comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification, and finished product inspection, wherein the S content in molten iron after molten iron pretreatment is 0.010%, converter BOF smelting and furnace deoxidation alloying are carried out, L F external refining is carried out for 25min, alloy components are finely adjusted, the temperature of molten steel reaches 1580 ℃, RH vacuum degassing treatment is carried out for 30min, argon is blown at the bottom, stirring and floating upward are carried out to remove non-metallic inclusions, the nitrogen, hydrogen and oxygen content are reduced, calcium wires are fed to purify the molten steel and spheroidize the non-metallic inclusions, argon protection pouring is carried out in the whole process, the electromagnetic stirring is carried out, the slab is uniformly heated for 1190 ℃, the heating time is 4.3h, two-stage rolling of four-roller reversible rolling mill is carried out, the rolling reduction rate is 63%, the rough rolling start temperature is 1150 ℃, the two-stage rolling start temperature is carried out, the finish rolling temperature is 790 ℃, the open cooling temperature is 760 ℃, the steel plate return to red temperature is 330 ℃, the straightening unevenness is 3mm/m of a.
The steel plate has the mechanical properties of yield strength of 475MPa, tensile strength of 635MPa, elongation of 23 percent, and impact energy of 277J, 276J and 281J (10 x 10mm in the center of the plate thickness) at the temperature of minus 40 ℃.
Example 3
The 420MPa low-carbon easy-welding marine structure steel plate provided by the embodiment is a 50mm specification S420M L (S420M L O/S420G2+ M) steel plate, and comprises the following chemical components, by mass, 0.07% of C, 0.31% of Si, 1.53% of Mn, 0.011% of P, 0.001% of S, 0.20% of Cr, 0.68% of Ni, 0.30% of Mo, 0.23% of Cu, 0.028% of Nb, 0.035% of V, 0.025% of Ti, 0.0021% of B and 0.023% of Al.
The manufacturing method comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification, and finished product inspection, wherein the S content in molten iron after molten iron pretreatment is 0.010%, converter BOF smelting and furnace deoxidation alloying are carried out, L F external refining is carried out for 25min, alloy components are finely adjusted, the temperature of molten steel reaches 1580 ℃, RH vacuum degassing treatment is carried out for 30min, argon is blown at the bottom, stirring and floating upward are carried out to remove nonmetallic inclusions, the content of nitrogen, hydrogen and oxygen is reduced, calcium wires are fed to purify molten steel and spheroidize the nonmetallic inclusions, argon protection pouring is carried out in the whole process, the drawing speed is 0.85m/min, electromagnetic stirring is carried out, the slab is uniformly heated for 1170 ℃, the heating time is 4.2h, two-stage rolling is carried out by a four-roller reversible rolling mill, the rolling reduction rate is 62%, the rough rolling start temperature is 1120 ℃, the start-rolling start temperature at the finish rolling temperature is 790 ℃, the start temperature, the cold-start rolling temperature is 755 ℃, the steel plate return-to-red temperature is 350.
The mechanical properties of the steel plate are as follows: the yield strength is 470MPa, the tensile strength is 645MPa, the elongation is 22 percent, and the impact energy at 40 ℃ is 290J, 292J and 297J (10 x 10mm at the center of the plate thickness).
Example 4
The 420MPa low-carbon easy-welding marine structure steel plate provided by the embodiment is a 20mm specification S420M L (S420M L O/S420G2+ M) steel plate, and comprises the following chemical components, by mass, 0.07% of C, 0.27% of Si, 1.55% of Mn, 0.015% of P, 0.001% of S, 0.20% of Cr, 0.40% of Ni, 0.18% of Mo, 0.20% of Cu, 0.023% of Nb, 0.033% of V, 0.026% of Ti, 0.0021% of B and 0.026% of Al.
The manufacturing method comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification, and finished product inspection, wherein the S content in molten iron after molten iron pretreatment is 0.010%, converter BOF smelting and furnace deoxidation alloying are carried out, L F external refining is carried out for 25min, alloy components are finely adjusted, the temperature of molten steel reaches 1580 ℃, RH vacuum degassing treatment is carried out for 30min, argon is blown at the bottom, stirring and floating upward are carried out to remove nonmetallic inclusions, the content of nitrogen, hydrogen and oxygen is reduced, calcium wires are fed to purify the molten steel and spheroidize the nonmetallic inclusions, argon protection pouring is carried out in the whole process, the drawing speed is 0.90m/min, electromagnetic stirring is carried out, the slab is uniformly heated 1185 ℃, the heating time is 4.3h, two-stage rolling is carried out by a four-roller reversible rolling mill, the rolling reduction rate is 62%, the rough rolling start temperature is 1160 ℃, the two-stage rolling start temperature is 890 ℃, the finish rolling temperature is 810 ℃, the annealing temperature is 750 ℃, the steel plate return to the red temperature is 350 ℃, the straightening unevenness of.
The mechanical properties of the steel plate are as follows: yield strength 465MPa, tensile strength 640MPa, elongation 23%, impact energy 287J, 277J, 283J at-40 ℃ (10X 10mm in the center of the plate thickness)
Example 5
The 420MPa low-carbon easy-welding marine structure steel plate provided by the embodiment is a 10mm specification S420M L (S420M L O/S420G2+ M) steel plate, and comprises the following chemical components, by mass, 0.06% of C, 0.28% of Si, 1.52% of Mn, 0.014% of P, 0.003% of S, 0.18% of Cr, 0.40% of Ni, 0.17% of Mo, 0.21% of Cu, 0.023% of Nb, 0.028% of V, 0.023% of Ti, 0.0020% of B and 0.025% of Al.
The manufacturing method comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling inspection identification, and finished product inspection, wherein the S content in molten iron after molten iron pretreatment is 0.010%, converter BOF smelting and furnace deoxidation alloying are carried out, L F external refining is carried out for 25min, alloy components are finely adjusted, the temperature of molten steel reaches 1580 ℃, RH vacuum degassing treatment is carried out for 30min, argon is blown at the bottom, stirring and floating upward are carried out to remove nonmetallic inclusions, the content of nitrogen, hydrogen and oxygen is reduced, calcium wires are fed to purify the molten steel and spheroidize the nonmetallic inclusions, argon protection pouring is carried out in the whole process, the drawing speed is 0.85m/min, electromagnetic stirring is carried out, the slab is uniformly heated up to 1220 ℃, the heating time is 4.2h, two-stage rolling is carried out by a four-roller reversible rolling mill, the rolling reduction rate is 63%, the rough rolling start temperature is 1180 ℃, the two-stage start rolling start temperature is carried out, the finish rolling temperature is 860 ℃, the start temperature is 760 ℃, the roll tempering temperature is 370 ℃, the steel plate return.
The mechanical properties of the steel plate are as follows: yield strength 445MPa, tensile strength 630MPa, elongation 20%, -40 ℃ impact energy 89J,76J, 81J (5 x 10 mm).
The traditional 420 MPa-level marine steel is a fine pearlite structure obtained by tempering, and has the advantages of long process flow, long delivery time, high cost, high carbon equivalent and poor welding performance. The invention adopts the design of lower carbon and lower carbon equivalent, the alloy composition is mainly designed to quickly cool after controlled rolling to form a fine lath bainite structure, good mechanical property and fatigue property are obtained, the welding and toughness of a steel plate with the specification of 10-100mm are favorably improved, and the produced product with the specification of 10-100mm is easy to weld, and the corrosion resistance is improved by proper chromium content. Compared with the existing products, the obtained steel plate product is flatter, more uniform in performance, small in blanking cutting deformation and more excellent in welding performance, and is suitable for production and manufacturing of large-scale projects in the marine steel structure industry. The offshore operation requirement of offshore oil and gas production at home and abroad can be met, the application field is mainly the production of offshore oil and gas field platforms, and the offshore oil and gas field platforms are mainstream materials with large quantity and wide range in offshore marine construction industry, so that the development and utilization of ocean resources are promoted, and the value is created for the society.
According to the annual output of 20-30 ten thousand tons and the gross profit of 1200 yuan per ton steel, the gross profit of the company is estimated to exceed 24000-.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a 420MPa low carbon easily welds marine structure steel sheet which characterized in that: the chemical components and the mass percentage are as follows: the thickness of the steel plate is 10-100mm, C: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.00-1.90%, P less than 0.015%, S less than 0.010%, Cr: 0 to 0.50%, Ni 0 to 1.20%, Mo: 0-0.65%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
2. The 420MPa low-carbon easy-welding marine structural steel plate as claimed in claim 1, is characterized in that: the chemical components and the mass percentage are as follows: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.20-1.80%, P less than 0.015%, S less than 0.005%, Cr: 0 to 0.50%, Ni 0 to 1.10%, Mo: 0-0.55%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
3. The 420MPa low-carbon easy-welding marine structural steel plate as claimed in claim 1, is characterized in that: the chemical components and the mass percentage are as follows: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.10-1.80%, P less than 0.015%, S less than 0.006%, Cr: 0 to 0.50%, Ni 0 to 1.10%, Mo: 0-0.65%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
4. The 420MPa low-carbon easy-welding marine structural steel plate as claimed in claim 1, is characterized in that: the chemical components and the mass percentage are as follows: c: 0.05 to 0.11 percent, Si: 0.10-0.60%, Mn: 1.10-1.80%, P less than 0.015%, S less than 0.005%, Cr: 0 to 0.50%, Ni 0 to 1.20%, Mo: 0-0.55%, Cu: 0 to 0.40%, Nb 0 to 0.060%, V: 0-0.15%, Ti: 0-0.12%, B: 0-0.0030%, Al: 0.010-0.060%.
5. The method for manufacturing the 420MPa low-carbon easy-welding marine structural steel plate as claimed in any one of claims 1 to 4, which comprises the steps of molten iron pretreatment, converter steelmaking, deoxidation alloying, L F refining, RH vacuum degassing, CCM continuous casting, slab heating, two-stage rolling, accelerated cooling, straightening, tempering, straightening, sampling, inspecting and marking, and the finished product is characterized in that:
the method comprises the steps of pretreating molten iron, wherein S in the molten iron is less than 0.010%, smelting in a BOF converter, deoxidizing and alloying after the furnace, refining for 15-30 min outside the L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1560-1600 ℃, carrying out RH vacuum degassing treatment for 15-30 min, blowing argon from the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen and oxygen, feeding a calcium wire to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protective casting in the whole process, carrying out electromagnetic stirring at a pulling speed of 0.75-1.2 m/min, uniformly heating a plate blank at 1150-1250 ℃, carrying out heating for 3.5-4.5 h, carrying out two-stage rolling by a four-roller reversible rolling mill, controlling the rolling reduction rate to be more than 60%, carrying out rough rolling at the initial temperature of 1070-1220 ℃, carrying out the second-stage rolling at the final rolling temperature of 780-860 ℃, controlling cooling, carrying out the steel plate at the red returning temperature of 250-460 ℃, carrying out straightening temperature of 1-6mm/m by.
6. The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate as claimed in claim 5, characterized in that: the thickness of the steel plate is 100mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.08%, Si: 0.31%, Mn: 1.53%, P: 0.011%, S: 0.001%, Cr: 0.25%, Ni 0.95%, Mo: 0.33%, Cu: 0.22%, Nb 0.026%, V: 0.055%, Ti: 0.025%, B: 0.0023%, Al: 0.032%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, carrying out RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protection casting in the whole process at a pulling speed of 0.90m/min, carrying out electromagnetic stirring, uniformly heating a plate blank again for 4.2h, carrying out two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 63 percent, the rough rolling starting temperature is 1120 ℃, the two-stage starting temperature is 890 ℃, the final rolling temperature is 780 ℃, the steel plate re-reddening temperature is 350 ℃, the unevenness of a nine-roll straightener is 3mm/m, carrying out tempering for 2h at 500 ℃, marking and inspecting finished products, and warehousing after.
7. The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate as claimed in claim 5, characterized in that: the thickness of the steel plate is 80mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.27%, Mn: 1.50%, P: 0.013%, S: 0.002%, Cr: 0.26%, Ni 0.78%, Mo: 0.29%, Cu: 0.21%, Nb:0.027%, V: 0.41%, Ti: 0.020%, B: 0.0019%, Al: 0.028%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside an L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, performing argon protection casting in the whole process at a drawing speed of 0.86m/min, electromagnetically stirring, uniformly heating a plate blank at 1190 ℃ for 4.3h, rolling by a four-roll reversible rolling mill in two stages, wherein the rolling reduction rate is 63 percent, the rough rolling starting temperature is 1150 ℃, the secondary starting temperature is 890 ℃, the final rolling temperature is 790 ℃, the starting temperature is 760 ℃, the steel plate re-reddening temperature is 330 ℃, the straightening unevenness of a nine-roll straightener is 3mm/m, tempering at 520 ℃ for 2h, marking and inspecting finished products, and warehousing qualified products.
8. The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate as claimed in claim 5, characterized in that: the thickness of the steel plate is 50mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.31%, Mn: 1.53%, P: 0.011%, S: 0.001%, Cr: 0.20%, Ni 0.68%, Mo: 0.30%, Cu: 0.23%, Nb:0.028%, V: 0.035%, Ti: 0.025%, B: 0.0021%, Al: 0.023%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel and spheroidize the nonmetallic inclusions, performing argon protection casting in the whole process at a drawing speed of 0.85m/min, electromagnetically stirring, uniformly heating a plate blank again for 4.2h, performing two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 62 percent, the rough rolling start rolling temperature is 1120 ℃, the two-stage start rolling temperature is 890 ℃, the finish rolling temperature is 790 ℃, the start cooling temperature is 755 ℃, the steel plate re-reddening temperature is 350 ℃, the unevenness of a nine-roll straightener is 3mm/m, tempering for 2h at 520 ℃, marking and inspecting finished products, and warehousing.
9. The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate as claimed in claim 5, characterized in that: the thickness of the steel plate is 20mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.015%, S: 0.001%, Cr: 0.20%, Ni 0.40%, Mo: 0.18%, Cu: 0.20%, Nb 0.023%, V: 0.033%, Ti: 0.026%, B: 0.0021%, Al: 0.026%;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside the converter at L F, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, carrying out RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel, spheroidizing the nonmetallic inclusions, carrying out argon protection casting in the whole process at a pulling speed of 0.90m/min, carrying out electromagnetic stirring, uniformly heating a plate blank at 1185 ℃ for 4.3h, carrying out two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 62 percent, the rough rolling starting temperature is 1160 ℃, the two-stage starting temperature is 890 ℃, the final rolling temperature is 810 ℃, the starting cooling temperature is 750 ℃, the steel plate re-redding temperature is 350 ℃, straightening unevenness is 3mm/m by a nine-roll straightening machine, carrying out tempering for 2h at 520.
10. The manufacturing method of the 420MPa low-carbon easy-welding marine structure steel plate as claimed in claim 5, characterized in that: the thickness of the steel plate is 10mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.06%, Si: 0.28%, Mn: 1.52%, P: 0.014%, S: 0.003%, Cr: 0.18%, Ni 0.40%, Mo: 0.17%, Cu: 0.21%, Nb:0.023%, V: 0.028%, Ti: 0.023%, B: 0.0020%, Al: 0.025 percent;
0.010 percent of S in molten iron after pretreatment, BOF smelting in a converter, deoxidizing and alloying after the converter, refining for 25min outside an L F furnace, finely adjusting alloy components to enable the temperature of the molten steel to reach 1580 ℃, RH vacuum degassing treatment for 30min, blowing argon at the bottom, stirring and floating up to remove nonmetallic inclusions and reduce the content of nitrogen, hydrogen and oxygen, feeding calcium wires to purify the molten steel and spheroidize the nonmetallic inclusions, performing argon protection casting in the whole process, wherein the drawing speed is 0.85m/min, performing electromagnetic stirring, uniformly heating a plate blank at 1220 ℃, heating time is 4.2h, performing two-stage rolling by a four-roll reversible rolling mill, wherein the rolling reduction rate is 63 percent, the rough rolling start rolling temperature is 1180 ℃, the two-stage start rolling temperature is 890 ℃, the finish rolling temperature is 860 ℃, the start cooling temperature is 760 ℃, the steel plate return red temperature is 370 ℃, straightening unevenness of a nine-roll straightener is 3mm/m, tempering for 2h at 520 ℃, marking and inspecting finished products.
CN202010304117.4A 2020-04-17 2020-04-17 420MPa low-carbon easy-welding marine structural steel plate and manufacturing method thereof Pending CN111394653A (en)

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Application publication date: 20200710