CN111455271B - Steel plate with thickness of S355G10+ N for ocean structure and production method thereof - Google Patents
Steel plate with thickness of S355G10+ N for ocean structure and production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a steel plate with the thickness of S355G10+ N for an ocean structure, and relates to the technical field of steel smelting, wherein the maximum thickness of the steel plate is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.08-0.14%, Mn: 1.30% -1.65%, Si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015-0.030 percent of the total weight of the alloy, V is less than or equal to 0.03 percent, and the weight ratio of Ti: 0.10% -0.020%, Alt: 0.020% -0.055%, Ni: 0.10 to 0.50 percent of the total weight of the alloy, less than or equal to 0.43 percent of CEV, less than or equal to 0.21 percent of Pcm, and the balance of Fe and inevitable impurities. The 150mm super-thick steel plate has excellent low-temperature toughness, particularly the impact at the position with the thickness of 1/2 and the temperature of minus 40 ℃ is more than 100J, has good welding performance, and better meets the use and service requirements of offshore structures.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a steel plate with the thickness of S355G10+ N for an ocean structure and a production method thereof.
Background
The S355G10 steel belongs to the brand number of BSEN10225 standard weldable structural steel for offshore structures, and specifies the chemical components, the mechanical properties, the welding properties and the like of the offshore structural steel. At present, no special standard for ocean engineering steel is established in China, low-carbon equivalent and microalloying are adopted in China, and a reasonable heat treatment process (such as normalizing) is selected to develop an S355G10+ N, S355NL steel plate after binding control, so that the application of partial offshore platforms and structural members can be met.
In the aspect of development of steel for ocean engineering, normalizing process production S355G10+ N and TMCP process production S355G10+ M products are available, such as: the patent CN 104726769 discloses a 'S355G 10+ N steel plate for a thickness ocean platform and a production method thereof', wherein ingot mold casting is adopted for steel making, and steel blanks are subsequently rolled, so that the steel making cost is high; due to the solidification of steel ingots, the influence of the rolling permeability of the extra-thick plate, the impact technology difficulty at the position with the thickness of 1/2 and the temperature of 40 ℃ below zero is high, and the flaw detection quality cannot be guaranteed. Patent CN 109628853 discloses 'an extra thick steel plate S355G10 for ocean engineering and manufacturing method', which adopts low carbon component design, TMCP process, and tempering process production, is limited by the compression ratio of continuous casting billet, and the maximum thickness of the production is 120mm, which can not completely meet the requirement of extra thick steel plate with thickness more than 120mm for ocean engineering.
The method is limited by the compression ratio of the existing continuous casting billet, the EN10225 standard requires that the rolling compression ratio is not less than 4 times, the thickness of an S355G10+ N steel plate for a general ocean structure, such as an S355G10+ N super-thick steel plate with the thickness of more than 100mm, is mostly rolled by using steel ingots as raw materials so as to ensure a large compression ratio, and the normalizing heat treatment process is adopted for production, because of the solidification reasons of the steel ingots, the limitation of the rolling permeability of the super-thick plate and the like, the impact technology at the position of-40 ℃ of the super-thick plate with the thickness of 1/2 is difficult, and the flaw detection quality cannot be ensured. The maximum thickness of the TMCP process and the TMCP + tempering process is only 100mm and 120mm, and the requirements of extra-thick plates with the thickness of more than 120mm for ocean engineering cannot be completely met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a steel plate with the thickness of S355G10+ N for an ocean structure, the maximum thickness of the steel plate is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.08-0.14%, Mn: 1.30% -1.65%, Si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015-0.030 percent of the total weight of the alloy, V is less than or equal to 0.03 percent, and the weight ratio of Ti: 0.10% -0.020%, Alt: 0.020% -0.055%, Ni: 0.10 to 0.50 percent of the total weight of the alloy, less than or equal to 0.43 percent of CEV, less than or equal to 0.21 percent of Pcm, and the balance of Fe and inevitable impurities.
The technical effects are as follows: the invention adopts reasonable component design, composite blank rolling, normalizing heat treatment process and the like to develop the S355G10+ N steel plate with the maximum thickness of 150mm specified by the BSEN10225 standard, the impact toughness of the steel plate at the position close to the surface and 1/2 ℃ below zero is not less than 100J, the performance in the thickness direction reaches Z35 level, the flaw detection is qualified according to the EN10160 standard S2E3 level, the comprehensive mechanical property index reaches the same foreign level, the low-temperature toughness is excellent, and the welding performance is more excellent.
The technical scheme of the invention is further defined as follows:
the thickness S355G10+ N steel plate for the ocean structure comprises the following chemical components in percentage by mass: c: 0.08-0.10%, Mn: 1.58% -1.65%, Si: 0.34 to 0.50 percent of Nb, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, and the weight ratio of Nb: 0.015-0.021%, V is less than or equal to 0.028%, Ti: 0.10% -0.020%, Alt: 0.020% -0.031%, Ni: 0.10 to 0.31 percent of the total weight of the alloy, less than or equal to 0.40 percent of CEV, less than or equal to 0.20 percent of Pcm, and the balance of Fe and inevitable impurities.
The thickness S355G10+ N steel plate for the ocean structure comprises the following chemical components in percentage by mass: c: 0.12-0.14%, Mn: 1.30% -1.41%, Si: 0.10-0.21%, P is less than or equal to 0.011%, S is less than or equal to 0.001%, Nb: 0.027-0.030 percent, V is less than or equal to 0.03 percent, Ti: 0.10% -0.020%, Alt: 0.036% -0.055%, Ni: 0.43 to 0.50 percent of the total weight of the alloy, less than or equal to 0.40 percent of CEV, less than or equal to 0.21 percent of Pcm, and the balance of Fe and inevitable impurities.
The invention also aims to provide a method for producing a steel plate with the thickness of S355G10+ N for the marine structure, which comprises a plate blank vacuum welding process, a composite blank heating process, a rolling process and a normalizing heat treatment process,
plate blank vacuum welding process: more than two continuous casting blanks with the same furnace number and the same component are adopted, and plate blank welding is carried out under the condition that the vacuum degree is less than or equal to 0.05 Pa, so that a welding composite blank with the thickness of more than 600mm is obtained;
a composite blank heating procedure: heating the plate blank to 1200-1250 ℃, and preserving heat for 5-10 h;
a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, the final rolling temperature in the rough rolling stage is more than or equal to 950 ℃, the initial rolling temperature in the finish rolling stage is less than or equal to 840 ℃, and the steel plate after rolling is cooled in air;
normalizing heat treatment procedure: normalizing the steel plate in a heat treatment furnace at the normalizing temperature of 880-920 ℃, wherein the heat preservation time is (1.8-2.0) multiplied by H minutes, and H is the thickness of the steel plate in mm.
The thickness of the steel plate S355G10+ N for the ocean structure is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.10%, Mn: 1.58%, Si: 0.34%, P: 0.010%, S: 0.002%, Nb: 0.021%, V: 0.028%, Ti: 0.14%, Alt: 0.031%, Ni: 0.31%, CEV: 0.40%, Pcm: 0.20%, the balance being Fe and unavoidable impurities, comprising the steps of:
plate blank vacuum welding process: two 310mm continuous casting blanks with the same furnace number and the same component are adopted to carry out plate blank welding under the condition of 0.03 Pa of vacuum degree, and welding composite blanks with the thickness of 620mm are obtained;
a composite blank heating procedure: heating the plate blank to 1243 ℃, and preserving heat for 8 hours;
a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, wherein the final rolling temperature in the rough rolling stage is 988 ℃, the initial rolling temperature in the finish rolling stage is 832 ℃, and the steel plate after rolling is cooled in air;
normalizing heat treatment procedure: the steel plate is normalized in a heat treatment furnace, the normalizing temperature is 892 ℃, and the heat preservation time is 279 minutes.
The thickness of the steel plate is 150mm, and the chemical components and the mass percentage are as follows: c: 0.12%, Mn: 1.41%, Si: 0.21%, P: 0.011%, S: 0.001%, Nb: 0.027%, V: 0.03%, Ti: 0.020%, Alt: 0.036%, Ni: 0.43%, CEV: 0.40%, Pcm: 0.21%, the balance being Fe and unavoidable impurities, comprising the steps of:
plate blank vacuum welding process: two 300mm continuous casting blanks with the same furnace number and the same component are adopted to carry out plate blank welding under the condition of 0.04Pa of vacuum degree, and a welding composite blank with the thickness of 600mm is obtained;
a composite blank heating procedure: heating the plate blank to 1234 ℃, and preserving heat for 7 hours;
a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, wherein the finish rolling temperature in the rough rolling stage is 997 ℃, the start rolling temperature in the finish rolling stage is 836 ℃, and the steel plate after rolling is cooled in air;
normalizing heat treatment procedure: normalizing the steel plate in a heat treatment furnace at the normalizing temperature of 905 ℃ for 293 minutes.
The invention has the beneficial effects that:
(1) the invention can obtain the casting blank with the thickness by using the common continuous casting billet welding compound technology, the cost is far lower than that of a cast ingot steelmaking production mode, and the production efficiency is high;
(2) according to the invention, the high-quality continuous casting billet is used for welding and compositing, and as the impact at the 1/2-thick part of the rolled steel plate corresponds to the welding and compositing part and the near-surface part of the original casting billet, the impact toughness at the low temperature of-40 ℃ is better, and the flaw detection quality can be ensured;
(3) compared with a TMCP process, a TMCP + tempering process, the maximum thickness of the produced steel plate reaches 150mm, and exceeds the maximum thickness of 100mm and 120mm produced by a continuous casting billet;
(4) the 150mm extra-thick steel plate produced by the method has excellent low-temperature toughness, particularly, the position with the thickness of 1/2 is a welding compound position, the center segregation position of an original casting blank is avoided, and compared with a casting blank rolling production process, the low-temperature impact toughness at the position with the thickness of 1/2 of the steel plate is effectively ensured; the metallographic structure is an F + P structure, the grain size is 8.0-9.5 grade, the banded structure is less than or equal to 1.0 grade, the impact at the position with the thickness of 1/2 and the temperature of 40 ℃ below zero is more than 100J, the welding performance is good, and the use and service requirements of the offshore structure are better met.
Detailed Description
Example 1
The thickness of the steel plate with the thickness of S355G10+ N for the ocean structure provided by the embodiment is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.10%, Mn: 1.58%, Si: 0.34%, P: 0.010%, S: 0.002%, Nb: 0.021%, V: 0.028%, Ti: 0.14%, Alt: 0.031%, Ni: 0.31%, CEV: 0.40%, Pcm: 0.20%, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
plate blank vacuum welding process: through the treatment of cleaning, assembling, welding and the like of a continuous casting billet, two 310mm continuous casting billets with the same furnace number and the same component are adopted, and plate blank welding is carried out under the condition that the vacuum degree is 0.03 Pa, so that a welding composite billet with the thickness of 620mm is obtained;
a composite blank heating procedure: heating the plate blank to 1243 ℃, and preserving heat for 8 hours;
a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, wherein the final rolling temperature in the rough rolling stage is 988 ℃, the initial rolling temperature in the finish rolling stage is 832 ℃, and the steel plate after rolling is cooled in air;
normalizing heat treatment procedure: the steel plate is normalized in a heat treatment furnace, the normalizing temperature is 892 ℃, and the heat preservation time is 279 minutes.
The mechanical properties of the steel plate are as follows: 347MPa of yield strength, 498MPa of tensile strength, 30 percent of elongation after fracture, 0.70 of yield ratio, impact energy Akv of thickness close to the surface at-40 ℃: 134J, 180J, 152J, impact energy Akv at-40 ℃ at thickness 1/2: 209J, 207J, and 218J, reduction of area in the thickness direction: 61 percent, 56 percent and 55 percent, and the flaw detection is qualified according to EN10160 standard S2E3 grade.
Example 2
The thickness of the steel plate with the thickness of S355G10+ N for the ocean structure provided by the embodiment is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.12%, Mn: 1.41%, Si: 0.21%, P: 0.011%, S: 0.001%, Nb: 0.027%, V: 0.03%, Ti: 0.020%, Alt: 0.036%, Ni: 0.43%, CEV: 0.40%, Pcm: 0.21%, and the balance of Fe and inevitable impurities.
The production method comprises the following steps:
plate blank vacuum welding process: performing plate blank welding on two 300mm continuous casting blanks with the same furnace number and the same component under the condition of a vacuum degree of 0.04Pa by cleaning, assembling, welding and the like of the continuous casting blanks to obtain a welded composite blank with the thickness of 600 mm;
a composite blank heating procedure: heating the plate blank to 1234 ℃, and preserving heat for 7 hours;
a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, wherein the finish rolling temperature in the rough rolling stage is 997 ℃, the start rolling temperature in the finish rolling stage is 836 ℃, and the steel plate after rolling is cooled in air;
normalizing heat treatment procedure: normalizing the steel plate in a heat treatment furnace at the normalizing temperature of 905 ℃ for 293 minutes.
The mechanical properties of the steel plate are as follows: the yield strength is 342MPa, the tensile strength is 489MPa, the elongation after fracture is 28 percent, the yield ratio is 0.70, the thickness is near the surface, and the impact energy Akv is at-40 ℃: 163J, 192J, 185J, impact energy Akv at-40 ℃ at thickness 1/2: 226J, 196J, 198J, reduction of area in the thickness direction: 57%, 60% and 64%, and the flaw detection is qualified according to EN10160 standard S2E3 grade.
With the development of marine resources advancing to the deep sea, the demand of steel for marine engineering is expanding, especially for super-thick steel plates and large-sized steel plates, while the EN10225 standard S355G10 is a steel plate specially designed for offshore structures, and the market demand is large. Compared with a steel ingot cogging rolling mode, due to the influences of steel ingot solidification reasons, rolling permeability limitation of an extra-thick plate and the like, the impact technology at the position with the thickness of 1/2 ℃ below zero is difficult, and the flaw detection quality cannot be guaranteed. The invention adopts reasonable component design, composite blank rolling, normalizing heat treatment process and the like to develop the S355G10+ N steel plate with the maximum thickness of 150mm specified by EN10225 standard, the impact toughness of the steel plate at the position close to the surface and 1/2 at minus 40 ℃ is not less than 100J, the performance in the thickness direction reaches Z35 level, the flaw detection is qualified according to the EN10160 standard S2E3 level, and the comprehensive mechanical property index reaches the same foreign level.
The maximum thickness of the steel plate produced by the invention is 150mm, the process is also suitable for producing related products with the thickness not exceeding 150mm, the grade of the steel plate is S355G10+ N, and the quality of the steel plate simultaneously meets the series grade of S355G7+ N, S355G8+ N, S355G9+ N. The steel plate has excellent low-temperature toughness, low CEV and Pcm values due to component design, more excellent welding performance, good economic benefit and estimated gross profit per ton of steel more than 1000 yuan per ton, and better meets the requirements of offshore wind power, ocean platform construction and application of ultra-large container ships.
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 (2)
1. A steel plate with thickness S355G10+ N for ocean structures is characterized in that: the maximum thickness of the steel plate is 150mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.08-0.10%, Mn: 1.30% -1.65%, Si: 0.10-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.015-0.030 percent of the total weight of the alloy, V is less than or equal to 0.03 percent, and the weight ratio of Ti: 0.020% -0.10%, Alt: 0.020% -0.055%, Ni: 0.10 to 0.50 percent of Fe, less than or equal to 0.43 percent of CEV, less than or equal to 0.21 percent of Pcm, and the balance of Fe and inevitable impurities; the production method comprises a plate blank vacuum welding process, a composite blank heating process, a rolling process and a normalizing heat treatment process, and is characterized in that: plate blank vacuum welding process: two continuous casting blanks with the same furnace number and the same component are adopted to carry out plate blank welding under the condition that the vacuum degree is less than or equal to 0.05 Pa, and a welding composite blank with the thickness of more than 600mm is obtained; a composite blank heating procedure: heating the plate blank to 1200-1250 ℃, and preserving heat for 5-10 h; a rolling procedure: the wide and thick plate rolling mill is used for rolling in two stages, the final rolling temperature in the rough rolling stage is more than or equal to 950 ℃, the initial rolling temperature in the finish rolling stage is less than or equal to 840 ℃, and the steel plate is air-cooled after rolling; normalizing heat treatment procedure: normalizing the steel plate in a heat treatment furnace at the normalizing temperature of 880-920 ℃, wherein the heat preservation time is (1.8-2.0) multiplied by H minutes, and H is the thickness of the steel plate in mm; the impact at-40 ℃ at the thickness of 1/2 is more than 100J.
2. The steel plate with thickness of S355G10+ N for marine structure according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.08-0.10%, Mn: 1.58% -1.65%, Si: 0.34 to 0.50 percent of Nb, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, and the weight ratio of Nb: 0.015-0.021%, V is less than or equal to 0.028%, Ti: 0.020% -0.10%, Alt: 0.020% -0.031%, Ni: 0.10 to 0.31 percent of the total weight of the alloy, less than or equal to 0.40 percent of CEV, less than or equal to 0.20 percent of Pcm, and the balance of Fe and inevitable impurities.
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| CN202010217169.8A CN111455271B (en) | 2020-03-25 | 2020-03-25 | Steel plate with thickness of S355G10+ N for ocean structure and production method thereof |
| PCT/CN2020/090752 WO2021189621A1 (en) | 2020-03-25 | 2020-05-18 | S355g10+n-thickness steel plate for offshore structure and production method therefor |
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| CN112048665B (en) * | 2020-08-17 | 2022-03-22 | 莱芜钢铁集团银山型钢有限公司 | Steel plate for polar region ocean engineering and preparation 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 |
| CN114410935B (en) * | 2021-12-30 | 2024-05-24 | 舞阳钢铁有限责任公司 | Production method of P265GH steel plate with good low-temperature impact toughness |
| CN115198074B (en) * | 2022-07-30 | 2023-06-20 | 日钢营口中板有限公司 | Heat treatment method for improving flaw detection and rescue qualification rate of low-alloy steel plate |
| CN115679203B (en) * | 2022-09-15 | 2023-12-29 | 舞阳钢铁有限责任公司 | Super-thick S355NLO steel plate for offshore oil storage ship and production method thereof |
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