CN114525453A - Thin-specification bridge steel and production method thereof - Google Patents

Thin-specification bridge steel and production method thereof Download PDF

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CN114525453A
CN114525453A CN202210141208.XA CN202210141208A CN114525453A CN 114525453 A CN114525453 A CN 114525453A CN 202210141208 A CN202210141208 A CN 202210141208A CN 114525453 A CN114525453 A CN 114525453A
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翟冬雨
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—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
    • C22C38/04—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/386—Plates

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Abstract

The invention discloses thin bridge steel and a production method thereof, relating to the technical field of steel production, wherein the thin bridge steel comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.080 percent of V, Ti: 0.006-0.020%, Cr is less than or equal to 0.80%, Ni is less than or equal to 1.10%, Mo is less than or equal to 0.60%, Cu is less than or equal to 0.55%, Al: 0.015% -0.060%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities. The welding performance of the product is effectively improved by the advanced magnesium metallurgy technology, the surface quality of the thin-specification product is effectively improved by adopting the advanced composite rolling technology, and the machine hour yield of the product is greatly improved.

Description

Thin-specification bridge steel and production method thereof
Technical Field
The invention relates to the technical field of steel production, in particular to thin bridge steel and a production method thereof.
Background
With the continuous improvement of the comprehensive national strength of China, the field of infrastructure construction is rapidly developed, the road and railway construction mileage is completely in the leading position of the world, the bridge construction has a place to place, but the requirements of steel for the bridge on the surface quality and the welding performance of a steel plate are extremely high, so that the improvement of the quality of the product and the improvement of the yield of the product are of great importance to the development of the bridge.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides steel for a thin bridge, which comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.080 percent of V, Ti: 0.006-0.020%, Cr is less than or equal to 0.80%, Ni is less than or equal to 1.10%, Mo is less than or equal to 0.60%, Cu is less than or equal to 0.55%, Al: 0.015% -0.060%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the steel for the thin bridge comprises the following chemical components in percentage by mass: c: 0.03% -0.17%, Si: 0.15-0.35%, Mn: 0.90-1.40%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Nb: 0.020% -0.040%, V: 0.010% -0.030%, Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Ni is less than or equal to 0.30%, Mo is less than or equal to 0.20%, Cu is less than or equal to 0.30%, Al: 0.015% -0.050%, Mg: 0.0008 to 0.0018 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The steel for the thin bridge comprises the following chemical components in percentage by mass: c: 0.03% -0.18%, Si: 0.15-0.55%, Mn: 0.90-1.70%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Nb: 0.010% -0.050%, V: 0.020-0.050%, Ti: 0.008-0.020%, Cr: 0.20-0.50%, Ni: 0.10% -0.50%, Mo: 0.10-0.50%, Cu: 0.10-0.55%, Al: 0.020% -0.060%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The steel for the thin bridge comprises the following chemical components in percentage by mass: c: 0.08-0.20%, Si: 0.20-0.55%, Mn: 0.90-2.00%, P is less than or equal to 0.013%, S is less than or equal to 0.005%, Nb: 0.030-0.060%, V is less than or equal to 0.080%, Ti: 0.006-0.020%, Cr: 0.20-0.80%, Ni: 0.10% -1.10%, Mo: 0.10-0.60%, Cu: 0.20-0.55%, Al: 0.020% -0.060%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The invention also aims to provide a production method of the steel for the thin-gauge bridge, which comprises the following steps:
s1, smelting the desulfurized molten iron in a converter, and sending the molten iron to LF for deoxidation alloying treatment to obtain low-carbon low-phosphorus low-sulfur killed steel;
s2, carrying out vacuum treatment on the molten steel by adopting RH (relative humidity), keeping the vacuum degree less than or equal to 5mbar for 10-20 min, feeding magnesium-aluminum wires for 100-300 m after the vacuum treatment is finished, and carrying out continuous casting after static stirring for 5-25 min;
s3, cogging the casting blank to 60-70 mm according to the size of the order, watering is not needed after cogging is finished, stacking cooling is carried out for 48 hours, surface blowing or peeling is carried out on the stacked and cooled blank according to the order requirement, spraying is carried out on the blank after surface treatment, grooving is carried out on the 2mm position around the lower blank after surface treatment, the grooving depth is 2-3 mm, welding is carried out on the upper blank and the lower blank, and composite welding is carried out on 3-5 blanks;
s4, conveying the blanks after composite welding to a heating furnace, heating to 1220-1260 ℃, rolling by adopting TMCP (thermal mechanical control processing), wherein the temperature of a second opening is 800-920 ℃, the final rolling temperature is 800-850 ℃, the temperature of water entering is 750-800 ℃, and the temperature of red return is 400-600 ℃;
s5, the rolling reduction of the finish rolling pass is less than 15mm, the rolling pass is more than 5, and the roll gap of the head and the tail of the rolled piece with the length of 2 meters is increased by 0.3-0.5 mm through a primary roll gap control program;
s6, performing hot straightening and warm straightening on the rolled steel plate, then performing off-line stacking cooling for 24 hours, and performing shearing and cutting on the steel plate after stacking cooling;
and S7, flaw detection, tempering, modulation, marking and warehousing are carried out on the divided steel plates according to the performance requirements.
In the thin steel for bridges, in step S5, the thickness of the steel blank to be heated is set to a target thickness (2 to 3 times) of the composite rolled block.
The invention has the beneficial effects that:
(1) the invention adopts the magnesium microalloying technology, the size of the inclusion is reduced to nano-scale micro inclusion less than 10 mu m from the average 50 mu m nano treated by the prior calcium, the tissue transformation in the welding process is facilitated, the tissue type mainly comprising acicular ferrite is easily formed after welding, and the product performance after welding is improved;
(2) the invention uses the composite rolling technology, effectively improves the surface quality of the product, and the product of the composite rolling part does not contact with a rolling roller way and a roller, so the surface quality is improved;
(3) according to the invention, by applying the composite rolling technology, the thickness of a rolled product is improved, the secondary opening temperature, the final rolling temperature and the water inlet temperature in the rolling process are reduced, the grain size of the product is effectively reduced, and the method is not only beneficial to the improvement of the level of a welding machine, but also beneficial to the improvement of low-temperature toughness;
(4) the invention can roll steel plates with different thicknesses and widths at the same time by a composite rolling technology, and the rolling thickness is improved mainly by the thickness of the blank to be heated, thereby effectively improving the machine-hour yield of thin products and greatly improving the production efficiency;
(5) the product of the invention has strong universality, is suitable for bridge steel with various purposes, such as common bridge steel, weather-resistant bridge steel and high-surface-quality bridge steel, is suitable for products with different width specifications, and can meet the size requirement of the product after cutting if the width exceeds the width.
Drawings
FIG. 1 is a metallographic structure diagram of example 1.
Detailed Description
Example 1
The steel for the thin bridge provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.06%, Si: 0.23%, Mn: 1.21%, P: 0.012%, S: 0.002%, Nb: 0.029%, V: 0.017%, Ti: 0.011%, Cr: 0.030%, Ni: 0.02%, Mo: 0.001%, Cu: 0.02%, Al: 0.033%, Mg: 0.00015%, B: 0.0003%, N: 0.0031% and no Ca, the balance being Fe and unavoidable impurities.
The production method comprises the following steps:
s1, smelting the desulfurized molten iron in a converter, and sending the molten iron to LF for deoxidation alloying treatment to obtain low-carbon low-phosphorus low-sulfur killed steel;
s2, carrying out vacuum treatment on the molten steel by adopting RH (relative humidity), wherein the vacuum degree is 2mbar, the vacuum retention time is 17min, feeding magnesium-aluminum wires for 230 m after the vacuum is finished, and carrying out continuous casting after static stirring for 15 min;
s3, cogging the casting blank to 65mm according to the size of the order, watering is not needed after cogging, stacking cooling is carried out for 48 hours, surface blowing or peeling is carried out on the stacked and cooled blank according to the order requirement, spraying is carried out on the blank after surface treatment, grooving is carried out on the 2mm position around the lower blank after surface treatment, the grooving depth is 2.3mm, welding is carried out on the upper blank and the lower blank, and composite welding is carried out on the 4 blanks;
s4, conveying the composite welded blank to a heating furnace, heating to 1250 ℃, rolling by adopting TMCP (thermal mechanical control processing), starting at 865 ℃ for the second time, performing final rolling at 835 ℃, introducing water at 765 ℃, and performing re-reddening at 510 ℃;
s5, setting the target thickness of the steel plate to be 8mm, setting the thickness of the blank to be heated to 83, setting the maximum reduction of a finish rolling pass to be 13mm, setting a rolling pass to be 16, and increasing the length of a 2-meter roll gap at the head and the tail of a rolled piece by 0.4mm through a primary roll gap control program;
s6, carrying out hot straightening and temperature straightening on the rolled steel plate, then carrying out offline stack cooling for 24 hours, and carrying out shearing and segmentation on the steel plate after stack cooling;
and S7, flaw detection, tempering, modulation, marking and warehousing are carried out on the divided steel plates according to the performance requirements.
Example 2
The steel for the thin bridge provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.31%, Mn: 0.96%, P: 0.008%, S: 0.003%, Nb: 0.031%, V: 0.042%, Ti: 0.013%, Cr: 0.29%, Ni: 0.33%, Mo: 0.21%, Cu: 0.30%, Al: 0.041%, Mg: 0.0011%, B: 0.00040%, N: 0.0046 percent, no Ca, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
s1, smelting the desulfurized molten iron in a converter, and sending the molten iron to LF for deoxidation alloying treatment to obtain low-carbon low-phosphorus low-sulfur killed steel;
s2, carrying out vacuum treatment on the molten steel by adopting RH (relative humidity), wherein the vacuum degree is 1mbar, the vacuum retention time is 18min, feeding magnesium-aluminum wires for 200 m after the vacuum is finished, and carrying out continuous casting after static stirring for 15 min;
s3, cogging the casting blank to 68mm according to the size of the order, watering is not needed after cogging, stacking cooling is carried out for 48 hours, surface blowing or peeling is carried out on the stacked and cooled blank according to the order requirement, spraying is carried out on the blank after surface treatment, grooving is carried out on the 2mm position around the lower blank after surface treatment, the grooving depth is 2.6mm, welding is carried out on the upper blank and the lower blank, and composite welding is carried out on the 5 blanks;
s4, conveying the blank after composite welding to a heating furnace, heating to 1230 ℃, rolling by adopting TMCP (thermal mechanical control processing), performing secondary opening at 836 ℃, performing final rolling at 821 ℃, performing water inlet at 786 ℃, and performing re-reddening at 510 ℃;
s5, rolling 5 blocks with the target thickness of the steel plate being 5mm, setting the thickness of the blank to be heated to 75, the reduction of the finish rolling pass to be 12mm, the rolling pass to be 12 passes, and increasing the roll gap of the head and the tail of the rolled piece with the length of 2 meters by 0.33mm through a primary roll gap control program;
s6, performing hot straightening and warm straightening on the rolled steel plate, then performing off-line stacking cooling for 24 hours, and performing shearing and cutting on the steel plate after stacking cooling;
and S7, flaw detection, tempering, modulation, marking and warehousing are carried out on the divided steel plates according to the performance requirements.
Example 3
The steel for the thin bridge provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.27%, Mn: 1.60%, P: 0.006%, S: 0.0012%, Nb: 0.051%, V: 0.030%, Ti: 0.015%, Cr: 0.51%, Ni: 0.63%, Mo: 0.23%, Cu: 0.36%, Al: 0.046%, Mg: 0.0017%, B: 0.00010%, N: 0.0039%, Ca is not added, and the balance is Fe and inevitable impurities.
S1, smelting the desulfurized molten iron in a converter, and sending the molten iron to LF for deoxidation alloying treatment to obtain low-carbon low-phosphorus low-sulfur killed steel;
s2, carrying out vacuum treatment on the molten steel by adopting RH, keeping the vacuum degree at 3mbar for 15min, feeding the magnesium-aluminum wires for 220 m after the vacuum is finished, and carrying out continuous casting after static stirring for 15 min;
s3, cogging the casting blank to 63mm according to the size of the order, not watering after cogging, stacking for cooling for 48 hours, performing surface blowing or peeling on the stacked and cooled blank according to the order requirement, performing blank spraying after surface treatment, grooving 2mm around the lower blank after the surface treatment, and welding the upper blank and the lower blank by adopting 3 blanks for composite welding, wherein the grooving depth is 2.7 mm;
s4, conveying the composite welded blank to a heating furnace, heating to 1255 ℃, rolling by adopting TMCP (thermal mechanical control processing), wherein the temperature of the second opening is 830 ℃, the temperature of the final rolling is 805 ℃, the temperature of the entering water is 771 ℃, and the temperature of the re-reddening is 460 ℃;
s5, the thickness of a steel plate is 12mm, 3 pieces of steel plate are compositely rolled, the reduction of a finish rolling pass is 12mm, the rolling pass is 9 passes, and the roll gap of the head and the tail of a rolled piece with the length of 2 meters is increased by 0.36mm through a primary roll gap control program;
s6, performing hot straightening and warm straightening on the rolled steel plate, then performing off-line stacking cooling for 24 hours, and performing shearing and cutting on the steel plate after stacking cooling;
and S7, flaw detection, tempering, modulation, marking and warehousing are carried out on the divided steel plates according to the performance requirements.
In conclusion, the welding performance of the product is effectively improved through the advanced magnesium metallurgy technology; the advanced composite rolling technology is adopted, so that the surface quality of thin products is effectively improved, and the machine hour yield of the products is greatly improved; meanwhile, due to the application of the composite rolling technology, the secondary opening temperature and the water inlet temperature of the product are effectively reduced, the low-temperature toughness and the welding performance of the product are improved, the low-temperature toughness performance of the thin-specification product is effectively improved, the product quality is greatly improved, and the market competitiveness of the product is improved.
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 (6)

1. The thin-specification bridge steel is characterized in that: the chemical components and the mass percentage are as follows: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, less than or equal to 2.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.080 percent of V, Ti: 0.006-0.020%, Cr is less than or equal to 0.80%, Ni is less than or equal to 1.10%, Mo is less than or equal to 0.60%, Cu is less than or equal to 0.55%, Al: 0.015% -0.060%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
2. The steel for a thin gauge bridge according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.03% -0.17%, Si: 0.15-0.35%, Mn: 0.90-1.40%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, Nb: 0.020% -0.040%, V: 0.010% -0.030%, Ti: 0.006-0.020%, Cr is less than or equal to 0.30%, Ni is less than or equal to 0.30%, Mo is less than or equal to 0.20%, Cu is less than or equal to 0.30%, Al: 0.015% -0.050%, Mg: 0.0008 to 0.0018 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
3. The steel for a thin gauge bridge according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.03% -0.18%, Si: 0.15-0.55%, Mn: 0.90-1.70%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Nb: 0.010% -0.050%, V: 0.020-0.050%, Ti: 0.008-0.020%, Cr: 0.20-0.50%, Ni: 0.10% -0.50%, Mo: 0.10-0.50%, Cu: 0.10-0.55%, Al: 0.020% -0.060%, Mg: 0.0008 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
4. The steel for a thin gauge bridge according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.08-0.20%, Si: 0.20-0.55%, Mn: 0.90-2.00%, P is less than or equal to 0.013%, S is less than or equal to 0.005%, Nb: 0.030-0.060%, V is not more than 0.080%, Ti: 0.006-0.020%, Cr: 0.20-0.80%, Ni: 0.10-1.10%, Mo: 0.10-0.60%, Cu: 0.20-0.55%, Al: 0.020% -0.060%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0040 percent of B, less than or equal to 0.0120 percent of N, no Ca, and the balance of Fe and inevitable impurities.
5. A production method of steel for thin bridges is characterized by comprising the following steps: application to any of claims 1-4, comprising the steps of:
s1, smelting the desulfurized molten iron in a converter, and conveying the molten iron to LF (ladle furnace) for deoxidation alloying treatment to obtain low-carbon low-phosphorus low-sulfur killed steel;
s2, carrying out vacuum treatment on the molten steel by adopting RH (relative humidity), keeping the vacuum degree less than or equal to 5mbar for 10-20 min, feeding magnesium-aluminum wires for 100-300 m after the vacuum treatment is finished, and carrying out continuous casting after static stirring for 5-25 min;
s3, cogging the casting blank to 60-70 mm according to the size of the order, watering is not needed after cogging is finished, stacking and cooling are carried out for 48 hours, surface blowing or peeling is carried out on the stacked and cooled blank according to the order requirement, blank spraying is carried out after surface treatment, 2mm of the periphery of the lower blank is grooved after surface treatment, the groove depth is 2-3 mm, the upper blank and the lower blank are welded, and 3-5 blanks are adopted for composite welding;
s4, conveying the blanks after composite welding to a heating furnace, heating to 1220-1260 ℃, rolling by adopting TMCP (thermal mechanical control processing), wherein the temperature of a second opening is 800-920 ℃, the final rolling temperature is 800-850 ℃, the temperature of water entering is 750-800 ℃, and the temperature of red return is 400-600 ℃;
s5, the rolling reduction of the finish rolling pass is less than 15mm, the rolling pass is more than 5, and the roll gap of the head and the tail of the rolled piece with the length of 2 meters is increased by 0.3-0.5 mm through a primary roll gap control program;
s6, performing hot straightening and warm straightening on the rolled steel plate, then performing off-line stacking cooling for 24 hours, and performing shearing and cutting on the steel plate after stacking cooling;
and S7, flaw detection, tempering, modulation, marking and warehousing are carried out on the divided steel plates according to the performance requirements.
6. The production method of the steel for the thin-gauge bridge according to claim 5, wherein the production method comprises the following steps: in the step S5, the thickness of the blank to be heated is set to a target thickness (2 to 3 times) of the composite rolled block.
CN202210141208.XA 2022-02-16 2022-02-16 Thin-specification bridge steel and production method thereof Pending CN114525453A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115305410A (en) * 2022-08-12 2022-11-08 张家港扬子江冷轧板有限公司 High-weather-resistance high-strength steel for thin 700 MPa-grade carriage and preparation method thereof
CN115821156A (en) * 2022-11-10 2023-03-21 舞阳钢铁有限责任公司 Super-thick S355MLO steel plate for fixing offshore structure and production method thereof
CN116516250A (en) * 2023-04-26 2023-08-01 南京钢铁股份有限公司 Low-cost bridge steel and manufacturing method thereof
WO2023155372A1 (en) * 2022-02-16 2023-08-24 南京钢铁股份有限公司 Steel for thin-gauge bridges and production method therefor
CN116716538A (en) * 2023-04-26 2023-09-08 南京钢铁股份有限公司 High-strength bridge steel and manufacturing method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105821334A (en) * 2016-05-31 2016-08-03 江阴兴澄特种钢铁有限公司 Method for producing Q345DE steel plate with thickness of 4 mm on wide and thick plate rolling machine
CN105921514A (en) * 2016-05-17 2016-09-07 江阴兴澄特种钢铁有限公司 Method for producing high-strength Q690D steel plate with thickness of 4 mm on wide and thick plate mill
CN110066965A (en) * 2019-05-13 2019-07-30 南京钢铁股份有限公司 A kind of production method improving thin gauge pipeline steel surface quality
CN113025880A (en) * 2021-02-01 2021-06-25 南京钢铁股份有限公司 500 MPa-grade weather-resistant bridge steel and manufacturing method thereof
CN113025879A (en) * 2021-02-01 2021-06-25 南京钢铁股份有限公司 Weather-resistant bridge steel and smelting method thereof
CN113046627A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 345 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113046652A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 420 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113234999A (en) * 2021-04-27 2021-08-10 南京钢铁股份有限公司 Efficient welding bridge steel and manufacturing method thereof
CN113862557A (en) * 2021-08-20 2021-12-31 南京钢铁股份有限公司 Ferrite pearlite type Q345qD bridge steel extra-thick plate and manufacturing method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007277680A (en) * 2006-04-11 2007-10-25 Nippon Steel Corp Method for producing steel for welded structure excellent in high temperature strength and low temperature toughness
WO2020084332A1 (en) * 2018-10-23 2020-04-30 Arcelormittal Hot-rolled steel plate and a method of manufacturing thereof
CN114525453A (en) * 2022-02-16 2022-05-24 南京钢铁股份有限公司 Thin-specification bridge steel and production method thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105921514A (en) * 2016-05-17 2016-09-07 江阴兴澄特种钢铁有限公司 Method for producing high-strength Q690D steel plate with thickness of 4 mm on wide and thick plate mill
CN105821334A (en) * 2016-05-31 2016-08-03 江阴兴澄特种钢铁有限公司 Method for producing Q345DE steel plate with thickness of 4 mm on wide and thick plate rolling machine
CN110066965A (en) * 2019-05-13 2019-07-30 南京钢铁股份有限公司 A kind of production method improving thin gauge pipeline steel surface quality
CN113025880A (en) * 2021-02-01 2021-06-25 南京钢铁股份有限公司 500 MPa-grade weather-resistant bridge steel and manufacturing method thereof
CN113025879A (en) * 2021-02-01 2021-06-25 南京钢铁股份有限公司 Weather-resistant bridge steel and smelting method thereof
CN113046627A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 345 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113046652A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 420 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113234999A (en) * 2021-04-27 2021-08-10 南京钢铁股份有限公司 Efficient welding bridge steel and manufacturing method thereof
CN113862557A (en) * 2021-08-20 2021-12-31 南京钢铁股份有限公司 Ferrite pearlite type Q345qD bridge steel extra-thick plate and manufacturing method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023155372A1 (en) * 2022-02-16 2023-08-24 南京钢铁股份有限公司 Steel for thin-gauge bridges and production method therefor
CN115305410A (en) * 2022-08-12 2022-11-08 张家港扬子江冷轧板有限公司 High-weather-resistance high-strength steel for thin 700 MPa-grade carriage and preparation method thereof
CN115821156A (en) * 2022-11-10 2023-03-21 舞阳钢铁有限责任公司 Super-thick S355MLO steel plate for fixing offshore structure and production method thereof
CN115821156B (en) * 2022-11-10 2024-04-19 舞阳钢铁有限责任公司 Super-thick S355MLO steel plate for fixing offshore structure and production method thereof
CN116516250A (en) * 2023-04-26 2023-08-01 南京钢铁股份有限公司 Low-cost bridge steel and manufacturing method thereof
CN116716538A (en) * 2023-04-26 2023-09-08 南京钢铁股份有限公司 High-strength bridge steel and manufacturing method thereof

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