CN115961129A - Process for improving low-temperature impact performance of high-strength welded structural steel - Google Patents
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- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 35
- 238000005242 forging Methods 0.000 claims abstract description 48
- 238000005496 tempering Methods 0.000 claims abstract description 27
- 238000010791 quenching Methods 0.000 claims abstract description 26
- 230000000171 quenching effect Effects 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229910001563 bainite Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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- 238000009489 vacuum treatment Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a process for improving the low-temperature impact property of high-strength welded structural steel, which adopts the technical scheme that the process comprises the following steps: step S1, raw material control: preparing a structural steel blank, the structural steel comprising the components in percent by treatment count: c:0.12 to 0.16 percent; si:0.2 to 0.5 percent; mn:1.1 to 1.7 percent; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; cu is less than or equal to 0.0.05 percent; cr:1.0 to 1.5 percent; ni:1.9 to 2.0 percent; mo:0.3 to 0.7 percent; b is less than or equal to 0.005 percent; v:0.03 to 0.04 percent; nb:0.03 to 0.04 percent; ti is less than or equal to 0.02 percent; al:0.02 to 0.035 percent; step S2, forging control: heating the blank to 1230 +/-14 ℃, and then forging the blank; and S3, performing heat treatment after forging, wherein the heat treatment comprises normalizing, quenching and tempering: (1) normalizing: normalizing the forgings at 890 ℃, and then discharging from the furnace and air cooling; (2) quenching: the quenching normalizing temperature of the forge piece is 870 +/-14 ℃, and then the forge piece is taken out of the furnace and cooled by water; (3) tempering: the tempering temperature of the forge piece is 585 ℃, and the forge piece is discharged from a furnace and cooled in air.
Description
Technical Field
The invention relates to the technical field of structural steel preparation, in particular to a process for improving the low-temperature impact property of high-strength welded structural steel.
Background
Structural steel refers to steel that meets certain strength and formability grades, and can be divided into: carbon structural steel, low-alloy high-strength structural steel, weather-resistant structural steel, non-quenched and tempered mechanical structural steel and the like. The high-quality structural steel is mainly used for railways, bridges and various building projects to manufacture various metal components and welding parts bearing static loads.
The current publication No. CN1563468A is named as a production method of cold-forming high-strength welding structural steel, which adopts low carbon-manganese as a base, adds niobium and titanium microalloying elements as main components, adopts molten iron desulphurization technology, converter top and bottom combined blowing and vacuum treatment, pours the smelted molten steel into a plate blank after rare earth treatment or calcium treatment, and then rolls the plate blank into a medium plate or a hot rolled plate by adopting a medium plate production process or a hot continuous rolling production process. The invention can be widely applied to producing high-strength welding structural steel required by various engineering machinery. The tensile strength of the produced steel is above 590MPa level.
However, with the progress of industrial technology, along with the increasingly strict requirements on the use environment and design, the performance requirement on high-strength welding structural steel is higher and higher, the tensile strength of a steel plate which is more than 100-150 in GB/T16270 is 710-900MPa, the yield is more than or equal to 630, the Q690D requirement is that the impact at minus 20 ℃ is more than or equal to 47J, the impact at minus 40 ℃ is more than or equal to 34J, and the low-temperature impact performance of the material is improved under the requirement of ensuring the tensile strength and yield performance of the foot material.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a process for improving the low-temperature impact property of high-strength welded structural steel, which has the advantages of optimizing the alloy steel formula, improving the strength of a matrix, improving the hardenability and the low-temperature impact property, refining the structure after forging and ensuring the tensile property and the yield property of the material.
The technical purpose of the invention is realized by the following technical scheme:
a process for improving the low-temperature impact property of high-strength welded structural steel comprises the following steps:
step S1, raw material control: preparing a structural steel blank, wherein the structural steel comprises the following components in percentage by treatment: c:0.12 to 0.16 percent; si:0.2 to 0.5 percent; mn:1.1 to 1.7 percent; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; cu is less than or equal to 0.0.05 percent; cr:1.0 to 1.5 percent; ni:1.9 to 2.0 percent; mo:0.3 to 0.7 percent; b is less than or equal to 0.005 percent; v:0.03 to 0.04 percent; nb:0.03 to 0.04 percent; ti is less than or equal to 0.02 percent; al:0.02 to 0.035 percent;
step S2, forging control: heating the blank to 1230 +/-14 ℃, and then forging the blank;
and S3, performing heat treatment after forging, wherein the heat treatment comprises normalizing, quenching and tempering:
(1) Normalizing: normalizing the forgings at 890 ℃, and then discharging from the furnace and air cooling;
(2) And quenching: the quenching normalizing temperature of the forge piece is 870 +/-14 ℃, and then the forge piece is taken out of the furnace and cooled by water;
(3) And tempering: the tempering temperature of the forge piece is 585 ℃, and the forge piece is discharged from the furnace and air-cooled.
Further, in step S1, the carbon equivalent CEV = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15, and the carbon equivalent CEV is ensured to be less than or equal to 0.77.
Further, in step S2, the forging ratio control range is 5 to 7.
Further, in step S2, the finish forging temperature of the forged piece is more than or equal to 850 ℃.
Further, in the normalizing of the step S3, the furnace entering temperature of the forge piece is less than or equal to 350 ℃, and the forge piece is exposed to light on all sides after air cooling.
Furthermore, in the quenching of the step S3, the heat preservation time is 0.3-0.5 mm/min.
Further, in the quenching in step S3, the transit time from tapping to launching is controlled within 90S.
Further, in the quenching of the step S3, the forging is put into water with the initial temperature of less than 30 ℃, a circulating pump is started, and the water temperature is ensured to be less than or equal to 39 ℃ in the whole process.
Further, in the tempering in the step S3, the temperature of the forge piece entering the furnace is less than or equal to 350 ℃.
Further, in the tempering in the step S3, the tempering heat preservation time is 0.2-0.3 mm/min.
In conclusion, the invention has the following beneficial effects:
1. the raw materials are controlled to be C, si, mn, P, S, cr, ni, mo and V, a proper amount of Al is added, ceq carbon equivalent is improved, the passivation capability of Cr on steel is improved, a compact passivation film or a protective rust layer can be promoted to be formed on the surface of the steel, the self-corrosion potential of the steel can be changed to the positive direction by adding Ni, the stability of a matrix is increased, the repair capability of the matrix on the passivation film is improved, and the pitting-induced sensitivity is reduced; ni can improve the toughness and the hardenability while improving the strength, and can effectively prevent the network fracture phenomenon caused by the hot brittleness of Cu, thereby achieving the purposes of improving the strength of a matrix, and improving the hardenability and the low-temperature impact property.
2. The upsetting times are controlled during forging to ensure that a forged piece reaches a designed forging ratio, the finish forging temperature and cooling parameters after forging are strictly controlled, impurities are broken during the forging process, when the forging ratio reaches 5-7, the maximum balance between the performance and the efficiency is achieved, the structure can be greatly refined, harmful phases are reduced, and fine acicular ferrite and lath bainite are obtained.
3. In the heat treatment process, the content of alloy components is higher than that of common low alloy steel, the heat conduction is slow, the furnace entering temperature is controlled within 350 ℃, the lath bainite structure is easier to obtain at a low final cooling temperature and a high cooling rate, the subsequent performance uniformity is ensured by normalizing uniform structures, then the quenching is carried out to ensure that ferrite is subjected to austenite transformation and supercooled austenite is subjected to bainite transformation, a fine and uniform bainite structure is obtained, the strength, hardness and wear resistance of the steel at low temperature are greatly improved, internal stress accumulated in the quenching is eliminated by final tempering, and the low-temperature impact toughness of the forged piece is improved.
Drawings
FIG. 1 is a schematic representation of the steps of a process for improving the low temperature impact properties of high strength welded structural steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings and the following detailed description. The advantages and features of the present invention will become more apparent from the following description.
Example 1:
a process for improving the low-temperature impact performance of high-strength welded structural steel, as shown in fig. 1, comprising the following steps:
step S1, raw material control: preparing a structural steel blank, the structural steel comprising the components in percent by treatment count: c:0.12 to 0.16 percent; si:0.2 to 0.5 percent; mn:1.1 to 1.7 percent; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; cu is less than or equal to 0.0.05 percent; cr:1.0 to 1.5 percent; ni:1.9 to 2.0 percent; mo:0.3 to 0.7 percent; b is less than or equal to 0.005 percent; v:0.03 to 0.04 percent; nb:0.03 to 0.04 percent; ti is less than or equal to 0.02 percent; al:0.02 to 0.035 percent. And strictly controlling the carbon equivalent to satisfy CEV = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15 and the carbon equivalent CEV is less than or equal to 0.77.
Step S2, forging control: heating the blank to 1216 ℃, and then forging the blank, wherein the forging ratio control range of the forge piece is 5, and the finish forging temperature of the forge piece is more than or equal to 850 ℃.
And S3, performing heat treatment after forging, including normalizing, quenching and tempering:
(1) Normalizing: the charging temperature of the forge piece is less than or equal to 350 ℃, the normalizing temperature of the forge piece is 890 ℃, and then the forge piece is discharged from the furnace for air cooling, and the four sides of the forge piece are exposed to light, so that the hardenability of the forge piece is improved.
(2) And quenching: putting the forged piece into a hearth with the temperature of less than or equal to 350 ℃, quenching, keeping the heat preservation temperature at 860 ℃, keeping the heat preservation time at 0.3-0.5 mm/min, then discharging from the furnace, cooling by water, controlling the transfer time from discharging to discharging within 90S, putting the forged piece into water with the initial temperature of less than 30 ℃, starting a circulating pump, and ensuring that the water temperature is less than or equal to 39 ℃ in the whole process.
(3) And tempering: and (3) after the forging is cooled to room temperature, charging the forging into a furnace and tempering, putting the forging into a hearth at the temperature of less than or equal to 350 ℃, keeping the temperature of 0.2-0.3 mm/min at the tempering temperature of 585 ℃, and discharging from the furnace for air cooling.
Example 2:
the different steps from example 1 are:
step S2, forging control: heating the blank to 1230 ℃, and then forging the blank, wherein the forging ratio of the forge piece is controlled within the range of 5-7, and the finish forging temperature of the forge piece is more than or equal to 850 ℃.
And S3, performing heat treatment after forging, wherein the heat treatment comprises normalizing, quenching and tempering:
(1) Normalizing: the charging temperature of the forge piece is less than or equal to 350 ℃, the normalizing temperature of the forge piece is 890 ℃, and then the forge piece is discharged from the furnace for air cooling, and the four sides of the forge piece are exposed to light, so that the hardenability of the forge piece is improved.
(2) And quenching: putting the forged piece into a hearth with the temperature of less than or equal to 350 ℃, quenching, wherein the heat preservation temperature is 870 ℃, the heat preservation time is 0.3-0.5 mm/min, then discharging and cooling the forged piece, controlling the transfer time from discharging to discharging within 90S, putting the forged piece into water with the initial temperature of less than 30 ℃, turning on a circulating pump, and ensuring that the water temperature is less than or equal to 39 ℃ in the whole process.
(3) And tempering: and cooling the forge piece to room temperature, charging the forge piece into a furnace for tempering, putting the forge piece into a hearth at the temperature of less than or equal to 350 ℃, keeping the temperature of the forge piece at 585 ℃, discharging and air-cooling the forge piece at 0.2-0.3 mm/min.
Example 3:
the different steps from example 1 are:
step S2, forging control: heating the blank to 1244 ℃, and then forging the blank, wherein the forging ratio control range of the forge piece is 5-7, and the finish forging temperature of the forge piece is more than or equal to 850 ℃.
And S3, performing heat treatment after forging, including normalizing, quenching and tempering:
(1) Normalizing: the charging temperature of the forge piece is less than or equal to 350 ℃, the normalizing temperature of the forge piece is 890 ℃, then the forge piece is discharged from the furnace for air cooling, the four sides of the forge piece are exposed to light, and the hardenability of the forge piece is improved.
(2) And quenching: putting the forged piece into a hearth with the temperature of less than or equal to 350 ℃, quenching, keeping the heat preservation temperature of 884 ℃, keeping the heat preservation time of 0.3-0.5 mm/min, then discharging from the furnace, cooling by water, controlling the transfer time from discharging to discharging within 90S, putting the forged piece into water with the initial temperature of less than 30 ℃, starting a circulating pump, and ensuring that the water temperature is less than or equal to 39 ℃ in the whole process.
(3) And tempering: and (3) after the forging is cooled to room temperature, charging the forging into a furnace and tempering, putting the forging into a hearth at the temperature of less than or equal to 350 ℃, keeping the temperature of 0.2-0.3 mm/min at the tempering temperature of 585 ℃, and discharging from the furnace for air cooling.
Product detection:
the product test data are shown in table 1.
Detecting a sample: randomly selected 3 samples from different batches of products, which are designated as sample 1, sample 2 and sample 3.
TABLE 1
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A process for improving the low-temperature impact property of high-strength welded structural steel is characterized by comprising the following steps of:
step S1, raw material control: preparing a structural steel blank, wherein the structural steel comprises the following components in percentage by treatment: c:0.12 to 0.16 percent; si:0.2 to 0.5 percent; mn:1.1 to 1.7 percent; p is less than or equal to 0.015 percent; s is less than or equal to 0.010 percent; cu is less than or equal to 0.0.05 percent; cr:1.0 to 1.5 percent; ni:1.9 to 2.0 percent; mo:0.3 to 0.7 percent; b is less than or equal to 0.005 percent; v:0.03 to 0.04 percent; nb:0.03 to 0.04 percent; ti is less than or equal to 0.02 percent; al:0.02 to 0.035 percent;
step S2, forging control: heating the blank to 1230 +/-14 ℃, and then forging the blank;
and S3, performing heat treatment after forging, wherein the heat treatment comprises normalizing, quenching and tempering:
(1) Normalizing: normalizing the forgings at 890 ℃, and then discharging from the furnace and air cooling;
(2) And quenching: the quenching normalizing temperature of the forging is 870 +/-14 ℃, and then the forging is discharged from a furnace and cooled by water;
(3) And tempering: the tempering temperature of the forge piece is 585 ℃, and the forge piece is discharged from the furnace and air-cooled.
2. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 1, wherein the process comprises the following steps: in step S1, the carbon equivalent CEV = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15, and the carbon equivalent CEV is secured to 0.77.
3. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 1, wherein the process comprises the following steps: in step S2, the forging ratio is controlled within a range of 5 to 7.
4. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 3, wherein the process comprises the following steps: in step S2, the finish forging temperature of the forged piece is more than or equal to 850 ℃.
5. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 1, wherein the process comprises the following steps: in the normalizing of the step S3, the charging temperature of the forge piece is less than or equal to 350 ℃, and the forge piece is exposed to light on all sides after being cooled in air.
6. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 5, wherein the process comprises the following steps: in the quenching of the step S3, the heat preservation time is 0.3-0.5 mm/min.
7. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 6, wherein the process comprises the following steps: in the quenching in step S3, the transit time from tapping to launching is controlled within 90S.
8. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 7, wherein the process comprises the following steps: in the quenching of the step S3, the forging piece is put into water with the initial temperature of less than 30 ℃, a circulating pump is started, and the water temperature is ensured to be less than or equal to 39 ℃ in the whole process.
9. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 1, wherein the process comprises the following steps: in the tempering in the step S3, the charging temperature of the forge piece is less than or equal to 350 ℃.
10. The process for improving the low-temperature impact property of the high-strength welded structural steel according to claim 9, wherein the process comprises the following steps: in the tempering in the step S3, the tempering heat preservation time is 0.2-0.3 mm/min.
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