CN115198193A - TMCP (thermal mechanical control processing) process extra-thick specification offshore wind power steel EH36 and production method thereof - Google Patents
TMCP (thermal mechanical control processing) process extra-thick specification offshore wind power steel EH36 and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000010583 slow cooling Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000009489 vacuum treatment Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000005204 segregation Methods 0.000 claims description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims 2
- 229910001566 austenite Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- 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
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Abstract
The invention discloses a TMCP (thermal mechanical control processing) process extra-thick specification steel EH36 for offshore wind power and a production method thereof. The steel comprises the following chemical components, by mass, 0.05-0.07% of C, 0.10-0.30% of Si, 1.40-1.60% of Mn, 0.015% or less of P, 0.003% or less of S, 0.035% or less of Nb, 0.045% of Ti, 0.012-0.018% of Ti, 0.02% or less of Al, 0.05% or less of Ni, 0.15-0.30% of Ni, 0.10% or less of Cr, 0.20% or less of Mo, 0.30% or less of Cu, 0.05% or less of V, 0.008% or less of N and the balance of Fe and inevitable impurities; the steel plate delivery state is TMCP. The yield strength of the produced steel plate is more than or equal to 400MPa, the tensile strength is more than or equal to 510MPa, the low-temperature impact toughness is minus 40 ℃, and Akv is more than or equal to 200J. The finished steel plate does not need heat treatment, has the characteristics of low cost, excellent performance and quick delivery, and completely meets the quality requirement of the large-scale development of offshore wind power.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a TMCP (thermal mechanical control processing) process extra-thick specification steel EH36 for offshore wind power and a production method thereof.
Background
The main form of wind energy utilization is wind power, and the wind power is environment-friendly, low in cost and remarkable in benefit. Along with the increasing frequency of haze weather, the government increasingly attaches importance to environmental protection, the clean energy development space represented by wind power is huge, and the wind power is expected to become haze killer and make positive contribution to the development of the clean energy industry together with photovoltaic and the like. Since offshore wind power is known as an important carrier for realizing energy transformation and carbon neutralization, the installed capacity of a single unit of an offshore wind turbine is continuously increased, the demand of wind power steel plates with high strength and good low-temperature toughness of more than 80mm in the market is rapidly increased, and the development of steel for producing tubular pile parts of offshore wind power, which has high strength, good low-temperature toughness and excellent welding performance, is urgently needed.
Disclosure of Invention
The invention aims to provide a TMCP (thermal mechanical control processing) process extra-thick steel EH36 for offshore wind power and a production method thereof.
The invention is realized by the following technical scheme:
an EH36 steel plate of a TMCP (thermal mechanical control processing) process extra-thick offshore wind power steel comprises the process flows of converter smelting, refining, continuous casting, heating rolling, cooling, inspection and warehousing. The steel comprises the following chemical components, by mass, 0.05-0.07% of C, 0.10-0.30% of Si, 1.40-1.60% of Mn, 0.015% or less of P, 0.003% or less of S, 0.035% or less of Nb, 0.045% of Ti, 0.012-0.018% of Ti, 0.02% or less of Al, 0.05% or less of Ni, 0.15-0.30% of Ni, 0.10% or less of Cr, 0.20% or less of Mo, 0.30% or less of Cu, 0.05% or less of V, 0.008% or less of N and the balance of Fe and inevitable impurities; the delivery state of the steel plate is TMCP; the key process steps comprise:
(1) Smelting: smelting by adopting a converter, and carrying out top-bottom combined blowing; vacuum treatment is carried out by adopting an LF furnace and a VD (RH) furnace, O is controlled to be less than or equal to 20ppm, H is controlled to be less than or equal to 1.5ppm, S is controlled to be less than or equal to 30ppm, and low power segregation is controlled to be below 1.0 of national standard C class;
(2) Continuous casting: adopting a thick continuous casting billet with the thickness specification of 350mm/400mm/450mm and the width of 2070-2500 mm, wherein the compression ratio from the continuous casting billet to a steel plate is more than 3;
(3) Heating: hot charging the steel billet into a furnace, heating at 1180-1220 ℃ for more than 300 min;
(4) Rolling: adopting a double-frame two-stage controlled rolling process, wherein in the rough rolling stage, the rough rolling start rolling temperature is greater than or equal to 1050 ℃, when the temperature thickness is 150 to 250mm, the finish rolling is started, the finish rolling start rolling temperature is 800 to 830 ℃, and the finish rolling temperature is 730 to 780 ℃; cooling the MULPIC after rolling at the cooling speed of 5 to 8 ℃/S, wherein the open cooling temperature is 720 to 760 ℃, the final cooling temperature is 350 to 400 ℃;
(5) Slow cooling: and (5) slowly cooling the steel plates after the steel plates are stacked off the line, wherein the slow cooling time is more than or equal to 24 hours.
The invention principle is as follows: the invention adopts TMCP technology, controls rolling to thin austenite grains, introduces processing strain, and combines with subsequent control cooling to realize phase change structure control and thinning. The process comprises two parts of controlled rolling and controlled cooling after rolling, inhibits the growth of ferrite grains of the steel plate by accelerating the cooling speed after rolling, and obtains a refined ferrite structure, thereby improving the obdurability of the steel plate.
The invention has the advantages that: (1) A 350/400/450mm continuous casting billet is adopted, so that the compression ratio from the casting billet to a steel plate is ensured to be more than 3, the deformation of the steel plate is increased, and the mechanical property of the steel plate is improved; the TMCP process is adopted, the single-pass reduction after rough rolling broadening of the controlled rolling process is more than or equal to 35mm, the deformation of a rough rolling stage is ensured, the deformation of a high-temperature austenite recrystallization region is strengthened, austenite grains are fully refined, water cooling is rapidly carried out to 350-400 ℃ after rolling, acicular ferrite and bainite tissues are obtained, and the strength and the low-temperature impact property of a steel plate can be ensured; (2) The invention adopts TMCP technology to produce the EH36 wind power steel plate with the thickness of 80 mm-150 mm, the yield strength is more than or equal to 400MPa, the tensile strength is more than or equal to 510MPa, the low-temperature impact toughness is minus 40 ℃, akv is more than or equal to 180J, the Z-direction section shrinkage rate is more than or equal to 40 percent, and each mechanical property index is good.
Drawings
FIG. 1 is a metallographic structure diagram of a 1/4 thickness of a 100mm steel plate.
FIG. 2 is a metallographic structure diagram of a 150mm steel plate 1/4 in thickness.
Detailed Description
Example 1: production of 110mm thick wind power steel plate
The size of a continuous casting billet is 400mm multiplied by 2300mm multiplied by 3200mm, and the size of a finished steel plate is 110mm multiplied by 2350mm multiplied by L (length). The chemical components of the steel comprise, by mass, C =0.05%, si = 0.24%, mn =1.51%, P = 0.010%, S = 0.0015%, al =0.038%, nb = 0.040%, ti =0.012%, cr =0.14%, ni = 0.18%, mo =0.01%, ceq =0.35%, and the balance of Fe and unavoidable impurities; the process comprises the following steps:
(1) Smelting: smelting by adopting a converter, and carrying out top-bottom combined blowing; the LF furnace and the VD furnace are adopted for vacuum treatment, the contents of harmful gases such as O, H and the like and S are reduced, the O content is 15ppm, the H content is 1.4ppm, and the S content is 15 ppm;
(2) Continuous casting: adopting a thick continuous casting billet with the thickness of 400mm and the width of 2300mm, and ensuring that the compression ratio from the continuous casting billet to a steel plate is 4.0;
(3) Heating: hot charging steel blanks into a furnace, discharging at 1200 ℃, and heating for 350min;
(4) Rolling: adopting a double-frame two-stage controlled rolling process, wherein in the rough rolling stage, the rough rolling start rolling temperature is 1140 ℃, when the temperature thickness is 150mm, finish rolling is started, the finish rolling start rolling temperature is 820 ℃, the finish rolling temperature is 760 ℃, water cooling is carried out on MULPIC after rolling, and the finish cooling temperature is 380 ℃;
(5) Slow cooling: and (5) slowly cooling the steel plates after the steel plates are off-line and stacked, wherein the slow cooling time is more than or equal to 24h.
Example 2: production of 150mm thick wind power steel plate EH36
The size of the continuous casting billet is 450mm multiplied by 2270mm multiplied by 3500mm, and the size of the finished steel plate is 150mm multiplied by 2290mm multiplied by L (length). The steel comprises the following chemical components, by mass, C =0.05%, si = 0.20%, mn = 1.53%, P = 0.009%, S =0.0013%, al = 0.040%, nb =0.042%, ti =0.016%, cr =0.15%, ni0.25%, mo 0.01%, ceq =0.36%, and the balance of Fe and unavoidable impurities; the process comprises the following steps:
(1) Smelting: smelting by adopting a converter, and carrying out top blowing or top-bottom combined blowing; the LF furnace and the RH furnace are adopted for vacuum treatment, the contents of harmful gases such as O, H and the like and S are reduced, the content of O is 169pm, the content of H is 1.3ppm and the content of S is 13 ppm;
(2) Continuous casting: adopting a thick continuous casting billet with the thickness of 450mm and the width of 2270mm, and ensuring that the compression ratio from the continuous casting billet to a steel plate is 3.0;
(3) Heating: cold loading a steel billet into a furnace, wherein the tapping temperature of the heating furnace is 1220 ℃, and the heating time is 480 min;
(4) Rolling: adopting a double-frame two-stage controlled rolling process, wherein in the rough rolling stage, the rough rolling starting temperature is 1160 ℃, and finishing rolling is started when the temperature thickness is 250 mm; the initial rolling temperature of finish rolling is 800 ℃, the final rolling temperature is 740 ℃, MULPIC water cooling is carried out after rolling, and the final cooling temperature is 360 ℃;
(5) Slow cooling: and (5) slowly cooling the steel plates after the steel plates are stacked off the line, wherein the slow cooling time is more than or equal to 24 hours.
TABLE 1 test properties (impact temperature-40 ℃ C.) of the steels of examples
As can be seen from Table 1, all indexes of the material meet the requirements of steel GB/T712 for ocean engineering, the impact at-40 ℃ is excellent, and the material is basically stabilized at 240J or more. Therefore, the steel plate has excellent mechanical properties and is completely suitable for the requirement of the development of offshore wind power to large scale.
Claims (1)
1. A production method of the extra-thick specification offshore wind power steel EH36 by the TMCP process comprises the following process flows of converter smelting, refining, continuous casting, heating rolling, cooling, inspection and warehousing, and is characterized in that: the steel comprises the following chemical components, by mass, 0.05-0.07% of C, 0.10-0.30% of Si, 1.40-1.60% of Mn, 0.015% or less of P, 0.003% or less of S, 0.035% or less of Nb, 0.045% of Ti, 0.012-0.018% of Ti, 0.02% or less of Al, 0.05% or less of Ni, 0.15-0.30% of Ni, 0.10% or less of Cr, 0.20% or less of Mo, 0.30% or less of Cu, 0.05% or less of V, 0.008% or less of N and the balance of Fe and inevitable impurities; the delivery state of the steel plate is TMCP; the key process steps comprise:
(1) Smelting: smelting by adopting a converter, and carrying out top-bottom combined blowing; vacuum treatment is carried out by adopting an LF furnace and a VD (RH) furnace, O is controlled to be less than or equal to 20ppm, H is controlled to be less than or equal to 1.5ppm, S is controlled to be less than or equal to 30ppm, and low power segregation is controlled to be below 1.0 of national standard C class;
(2) Continuous casting: adopting a thick continuous casting billet, wherein the thickness specification is 350mm/400mm/450mm, the width is 2070-2500 mm, and the compression ratio from the continuous casting billet to a steel plate is more than 3;
(3) Heating: hot charging the steel billet into a furnace, heating at 1180-1220 ℃ for more than 300 min;
(4) Rolling: a double-frame two-stage controlled rolling process is adopted, in the rough rolling stage, the rough rolling starting temperature is greater than or equal to 1050 ℃, when the temperature and the thickness are 150-250mm, finish rolling is started, the finish rolling starting temperature is 800-830 ℃, and the finish rolling temperature is 730-780 ℃; cooling the MULPIC after rolling at the cooling speed of 5 to 8 ℃/S, wherein the open cooling temperature is 720 to 760 ℃, the final cooling temperature is 350 to 400 ℃;
(5) Slow cooling: and (5) slowly cooling the steel plates after the steel plates are stacked off the line, wherein the slow cooling time is more than or equal to 24 hours.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014282A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | Production method of high-strength and good-low-temperature-toughness wind power steel plate |
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106282789A (en) * | 2016-08-15 | 2017-01-04 | 山东钢铁股份有限公司 | A kind of low-carbon (LC) spy's thickness TMCP type Q420qE bridge steel and manufacture method thereof |
| CN107385329A (en) * | 2017-06-30 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength buildings structural steel plate and its manufacture method |
| CN109972033A (en) * | 2019-03-17 | 2019-07-05 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the super-thick steel plate Q460E of low-carbon-equivalent |
| CN110331345A (en) * | 2019-07-15 | 2019-10-15 | 唐山中厚板材有限公司 | 600MPa grades of low yield strength ratio high-performance building steel plates and its production method |
-
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- 2022-07-28 CN CN202210895696.3A patent/CN115198193A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014282A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | Production method of high-strength and good-low-temperature-toughness wind power steel plate |
| CN105803325A (en) * | 2016-04-28 | 2016-07-27 | 江阴兴澄特种钢铁有限公司 | Low-crack-sensitivity and low-yield strength-ratio ultra-thick steel plate and production method thereof |
| CN106282789A (en) * | 2016-08-15 | 2017-01-04 | 山东钢铁股份有限公司 | A kind of low-carbon (LC) spy's thickness TMCP type Q420qE bridge steel and manufacture method thereof |
| CN107385329A (en) * | 2017-06-30 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength buildings structural steel plate and its manufacture method |
| CN109972033A (en) * | 2019-03-17 | 2019-07-05 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the super-thick steel plate Q460E of low-carbon-equivalent |
| CN110331345A (en) * | 2019-07-15 | 2019-10-15 | 唐山中厚板材有限公司 | 600MPa grades of low yield strength ratio high-performance building steel plates and its production method |
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