CN102828114A - Ocean engineering steel plate with excellent strain ageing performance and method for manufacturing ocean engineering steel plate - Google Patents
Ocean engineering steel plate with excellent strain ageing performance and method for manufacturing ocean engineering steel plate Download PDFInfo
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Abstract
The invention discloses an ocean engineering steel plate with excellent strain ageing performance and a method for manufacturing the ocean engineering steel plate. The ocean engineering steel plate comprises, in weight percentage, from 0.08 to 0.15% of C, from 0.20 to 0.40% of Si, from 1.00 to 1.60% of Mn, lower than or equal to 0.010% of P, lower than or equal to 0.002% of S, from 0.025 to 0.050% of Nb, from 0.040 to 0.065% of V, from 0.005 to 0.020% of Ti, lower than or equal to 0.15% of Cr, from 0.10 to 0.40% of Ni, lower than or equal to 0.15% of Cu, from 0.04 to 0.08% of Mo, from 0.0250 to 0.040% of Al, lower than or equal to 20ppm of O, lower than or equal to 40ppm of N, lower than or equal to 2ppm of H and the balance Fe and inevitable impurities. A controlled rolling and cooling process is adopted, and thermal refining is realized, so that the manufactured ocean engineering steel plate for ocean engineering is high in strength and plasticity, good in Z-direction lamellar tearing resistance and excellent in strain ageing performance.
Description
Technical field
The present invention relates to a kind of oceanographic engineering and use steel, the oceanographic engineering of the thick strain aging excellent property of specifically a kind of 80mm is with steel plate and method of manufacture thereof.
Background technology
Along with the sharp increase of global oil and gas energy demand, the difficulty of land resources exploitation strengthen day by day; Wide ocean has become global oil and gas resource exploitation new growth point, and the oceanographic engineering equipment manufacture also becomes the major fields that countries in the world put forth effort to develop day by day.
In view of current the pressing for of China to the energy strategy deposit; Research and development have HS, the H.T. oceanographic engineering of independent intellectual property right and use super-thick steel plate; For improving China's energy system, suppressing the predation of surrounding countries to marine site resources such as China South Sea, the East Sea; The stand-alone development oceanic resources guarantee that national energy security is significant.
Thickness＞60～80mm high-strong toughness E36-Z35 steel plate is that the oceanographic engineering key position is used steel, is applied in the severe ocean Working environment such as wave, tide, storm and cold floating ice, supports platform and drilling outfit that gross weight surpasses hundreds of tons.These use characteristic have determined thickness＞60～80mm E36-Z35 steel plate to remove must to have: 1. high cleanliness; Low S, P, inclusion, gas content be high-strong toughness 2.; Satisfy thickness of slab 1/4 place-40 ℃ ballistic work vertically>=50J (or laterally>=34J) waits 3. good Z to performance index such as the 4. good weldability of anti-lamellar tearing performance
HS, good strain aging performance also should be arranged so that guarantee personnel's safety better and the work-ing life of raising ocean platform.
The strain aging of steel be meant when viscous deformation or after the viscous deformation C, N and the dislocation of the free state of solid solution condition interact, form the Ke Shi air mass, thereby cause the mechanics metallurgical phenomenon that intensity improves, toughness descends.Oceanographic engineering mainly is meant oceanographic engineering with the strain aging of steel in manufacturing processed with the strain aging of steel, in case the strain aging embrittlement accident takes place, catastrophic often, take place in seconds, hard to guard against.
Summary of the invention
In order to address the above problem, the oceanographic engineering that the purpose of this invention is to provide a kind of strain aging excellent property is with steel plate and method of manufacture thereof.This oceanographic engineering is wide with the steel suitability, and impact property, aging performance are good; Stable processing technique, mechanical property is good.
The objective of the invention is to realize through following technical scheme:
A kind of oceanographic engineering of strain aging excellent property is used steel plate, it is characterized in that: this steel plate chemical ingredients is by weight percentage: C 0.08～0.15%, and Si 0.20～0.40%, and Mn 1.00～1.60%; P≤0.010%, S≤0.002%, Nb 0.025～0.050%, and V 0.040～0.065%; Ti 0.005～0.020%, Cr≤0.15%, and Ni 0.10～0.40%, Cu≤0.15%; Mo0.04 ~ 0.08%, Al 0.0250～0.040%, O≤20 ppm; N≤40 ppm, H≤2ppm, surplus is Fe and unavoidable impurities.
Preferably, this steel plate chemical ingredients is by weight percentage: C 0.11%, and Si 0.20%, and Mn 1.50%, P0.009%; S0.0013%, Nb 0.035%, and V 0.050%, and Ti 0.008%, and Cr 0.06%; Ni 0.39%, Cu0.15%, and Mo0.08%, Al 0.030%; O0.0018%, N≤0.0037%, H0.00020%, surplus is Fe and unavoidable impurities.
A kind of oceanographic engineering of strain aging excellent property is characterized in that with the working method of steel plate this method specific requirement is following:
(1) steel-making and continuous casting process: target sulphur≤0.004% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, and guarantee>=35 minutes refining total time white slag hold-time>=10 minute; Vacuum-treat hold-time>=18 minute; Carrying out calcium after the vacuum-treat handles; The bag target temperature is a liquidus temperature+(10-20) ℃ in the continuous casting, and pulling rate is stable;
(2) rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1180 ℃～1250 ℃ before rolling; 1000～1100 ℃ of roughing temperature; 850～900 ℃ of finish rolling start rolling temperatures; Roll back laminar flow cooling, 550～720 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
(3) hardening and tempering process: quenching temperature is 870～950 ℃, and total soaking time is 162～202min, and tempering temperature is 550 ~ 680 ℃, and total soaking time is 200～330min, and the oceanographic engineering that obtains the strain aging excellent property is used steel plate.
Among the present invention, according to the smelting and the control of Clean Steel: sulphur falls in hot metal pretreatment; Converter is adopted double slag process to fall phosphorus and is prevented rephosphorization with the tapping pushing off the slag; Guarantee the white slag refining time, constituent contents such as the S in dross inclusion adsorption and the minimizing steel, O; Use calcium is handled, and improves inclusion morphology; Vacuum-treat reduces harmful element content such as H, N; Finally obtain the better continuously cast bloom of internal soundness.
1180 ℃～1250 ℃ of continuous blank heating temperatures before rolling, not only guaranteed the complete solid solution of microalloy element and but also prevent the too high grain growth that causes of temperature; Roughing adopts high temperature low speed to depress broken column crystal and seam blank subsurface defect and refine austenite crystal grain greatly; Three roads accumulative total draft is greater than 24%, through not inducing ferritic mechanism and suitable cooling control technology in the low temperature gross distortion of crystallizing field: 550～720 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling, the purpose of controlled grain size after the finish rolling.
Rational hardening and tempering process, quenching temperature is 870～950 ℃, total soaking time is 162～202min; Tempering temperature is 550 ~ 680 ℃; Total soaking time is 200～330min, play following three purposes: (1) grain refining, hindered the migration of free state C, N atom; (2) grain refining improves impact property, improves aging performance indirectly; (3) there is carbonitride to separate out after the modified process, reduced the C of free state in the steel, N atom.
The present invention has following advantage:
1, within the chemical ingredients scope of GB712-2011 and nine big surveying society standards; Develop the thick oceanographic engineering of strain aging excellent property 80mm and use the E36-Z35 steel plate; It is not that too high, general plate mill all can be produced that mill load is required, therefore; Suitability is wide, is fit to the domestic majority Heavy Plate Plant and produces.
2, the smelting through Clean Steel reduces blank segregation and subsurface defect such as loose, and controls the content of N element effectively; Depress broken column crystal and refine austenite crystal grain greatly through roughing high temperature low speed; Cold through finish rolling accumulated deformation and cooperation control, the purpose of grain size after the controlled hot rolling.
3, through rational hardening and tempering process can: (1) grain refining, hindered the migration of free state C, N atom; (2) grain refining improves impact property, improves aging performance indirectly; (3) there is carbonitride to separate out after the modified process, reduced the C of free state in the steel, N atom.
4, method of manufacture of the present invention, stable processing technique, mechanical property is good.
The present invention is specially adapted to the thick oceanographic engineering of 80mm with in the E36N-Z35 steel plate, has HS, high-ductility, good Z to anti-lamellar tearing performance, strain aging excellent property.
Description of drawings
Fig. 1 is in the typical figure of tissue topography under the metaloscope for test steel plate thick 1/4 of the present invention.
Embodiment
Embodiment 1～4
The oceanographic engineering of the thick strain aging excellent property of the 80mm of embodiment 1～4 is as shown in table 1 with the chemical ingredients of E36N-Z35 steel plate:
Table 1
The oceanographic engineering of the thick strain aging excellent property of the 80mm of embodiment 1 is with the working method of E36N-Z35 steel plate, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.004% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, 10 minutes white slag hold-times, guarantees refining total time 35 minutes; 18 minutes vacuum-treat hold-times; Carrying out calcium after the vacuum-treat handles; The bag target temperature is liquidus temperature+10 ℃ in the continuous casting, and pulling rate is stable.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1180 ℃ before rolling; 1000 ℃ of roughing temperature, the roughing first road draught is 30mm; 850 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 25%; Roll back laminar flow cooling, 550 ℃ of final cooling temperatures, 5 ℃/s of rate of cooling; Air cooling subsequently.
Hardening and tempering process: quenching temperature is 870 ℃, and total soaking time is 202min, and tempering temperature is 680 ℃, and total soaking time is 200min, and the oceanographic engineering that obtains the thick strain aging excellent property of 80mm is used the E36N-Z35 steel plate.
The oceanographic engineering of the thick strain aging excellent property of the 80mm of embodiment 2 is with the working method of E36N-Z35 steel plate, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.003% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, 12 minutes white slag hold-times, guarantees refining total time 38 minutes; 20 minutes vacuum-treat hold-times; Carrying out calcium after the vacuum-treat handles; The bag target temperature is liquidus temperature+20 ℃ in the continuous casting, and pulling rate is stable.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1250 ℃ before rolling; 1100 ℃ of roughing temperature, the roughing first road draught is 28mm; 900 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 28%; Roll back laminar flow cooling, 720 ℃ of final cooling temperatures, 15 ℃/s of rate of cooling; Air cooling subsequently.
Hardening and tempering process: quenching temperature is 950 ℃, and total soaking time is 162min, and tempering temperature is 550 ℃, and total soaking time is 330min, and the oceanographic engineering that obtains the thick strain aging excellent property of 80mm is used the E36N-Z35 steel plate.
The oceanographic engineering of the thick strain aging excellent property of the 80mm of embodiment 3 is with the working method of E36N-Z35 steel plate, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.0035% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, 13 minutes white slag hold-times, guarantees refining total time 40 minutes; 20 minutes vacuum-treat hold-times; Carrying out calcium after the vacuum-treat handles; The bag target temperature is liquidus temperature+15 ℃ in the continuous casting, and pulling rate is stable.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1200 ℃ before rolling; 1050 ℃ of roughing temperature, the roughing first road draught is 29mm; 860 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 26%; Roll back laminar flow cooling, 660 ℃ of final cooling temperatures, 10 ℃/s of rate of cooling; Air cooling subsequently.
Hardening and tempering process: quenching temperature is 910 ℃, and total soaking time is 175min, and tempering temperature is 600 ℃, and total soaking time is 310min, and the oceanographic engineering that obtains the thick strain aging excellent property of 80mm is used the E36N-Z35 steel plate.
The oceanographic engineering of the thick strain aging excellent property of the 80mm of embodiment 4 is with the working method of E36N-Z35 steel plate, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.003% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, 15 minutes white slag hold-times, guarantees refining total time 45 minutes; 22 minutes vacuum-treat hold-times; Carrying out calcium after the vacuum-treat handles; The bag target temperature is liquidus temperature+18 ℃ in the continuous casting, and pulling rate is stable.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1220 ℃ before rolling; 1080 ℃ of roughing temperature, the roughing first road draught is 30mm; 880 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 25%; Roll back laminar flow cooling, 600 ℃ of final cooling temperatures, 9 ℃/s of rate of cooling; Air cooling subsequently.
Hardening and tempering process: quenching temperature is 900 ℃, and total soaking time is 188min, and tempering temperature is 640 ℃, and total soaking time is 300min, and the oceanographic engineering that obtains the thick strain aging excellent property of 80mm is used the E36N-Z35 steel plate.
Fig. 1 obtains E36N-Z35 steel plate thickness of slab 1/4 to be in the typical figure of tissue topography under the metaloscope after embodiment 1 modifier treatment; Show modified after, organize tiny evenly.
After modified, thickness of slab 1/4 place of embodiment 1 ~ 4 and the cross directional stretch performance at thickness of slab 1/2 place and horizontal cold-bending property such as table 2, transverse impact performance such as table 3, Z are to performance such as table 4, strain aging impact property such as table 5.
Steel plate cross directional stretch performance after table 2 is modified and horizontal cold-bending property
Steel plate transverse impact performance after table 3 is modified
Steel plate Z after table 4 is modified is to performance
Strain aging impact property after table 5 is modified
Can find out that embodiment 1 ~ 4 mechanical property is far superior to E36N-Z35 requirement among the GB712, ys >=425; Tensile strength >=538; Unit elongation >=25%, Z are to sectional shrinkage >=58%, and-40 ℃ of ballistic works on average reach more than the 160J;-20 ℃ of strain aging ballistic works on average reach more than the 230J ,-40 ℃ of strain aging ballistic works on average reach more than the 90J, satisfy the requirement of the thick oceanographic engineering of 80mm with the E36N-Z35 steel plate.Have stable processing technique, mill capacity is required the characteristics of less, strain aging excellent property etc.
Claims (5)
1. the oceanographic engineering of a strain aging excellent property is used steel plate, it is characterized in that: this steel plate chemical ingredients is by weight percentage: C 0.08～0.15%, and Si 0.20～0.40%, and Mn 1.00～1.60%; P≤0.010%, S≤0.002%, Nb 0.025～0.050%, and V 0.040～0.065%; Ti 0.005～0.020%, Cr≤0.15%, and Ni 0.10～0.40%, Cu≤0.15%; Mo0.04 ~ 0.08%, Al 0.0250～0.040%, O≤20 ppm; N≤40 ppm, H≤2ppm, surplus is Fe and unavoidable impurities.
2. the oceanographic engineering of strain aging excellent property according to claim 1 is used steel plate, it is characterized in that: this steel plate chemical ingredients is by weight percentage: C 0.11%, and Si 0.20%, and Mn 1.50%, P0.009%; S0.0013%, Nb 0.035%, and V 0.050%, and Ti 0.008%, and Cr 0.06%; Ni 0.39%, Cu0.15%, and Mo0.08%, Al 0.030%; O0.0018%, N≤0.0037%, H0.00020%, surplus is Fe and unavoidable impurities.
3. the oceanographic engineering of the said strain aging excellent property of claim 1 is characterized in that with the working method of steel plate this method specific requirement is following:
(1) steel-making and continuous casting process: target sulphur≤0.004% behind the desulfurizing iron; Converter smelting adopts the double slag process dephosphorization, and converter tapping is worked as slag; The white slag operation is adopted in refining, and guarantee>=35 minutes refining total time white slag hold-time>=10 minute; Vacuum-treat hold-time>=18 minute; Carrying out calcium after the vacuum-treat handles; The bag target temperature is a liquidus temperature+(10-20) ℃ in the continuous casting, and pulling rate is stable;
(2) rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Continuous blank heating temperature is 1180 ℃～1250 ℃ before rolling; 1000～1100 ℃ of roughing temperature; 850～900 ℃ of finish rolling start rolling temperatures; Roll back laminar flow cooling, 550～720 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
(3) hardening and tempering process: quenching temperature is 870～950 ℃, and total soaking time is 162～202min, and tempering temperature is 550 ~ 680 ℃, and total soaking time is 200～330min, and the oceanographic engineering that obtains the strain aging excellent property is used steel plate.
4. the oceanographic engineering of strain aging excellent property according to claim 3 is characterized in that with the working method of steel plate: in the step (1), according to the smelting and the control of Clean Steel: sulphur falls in hot metal pretreatment; Converter is adopted double slag process to fall phosphorus and is prevented rephosphorization with the tapping pushing off the slag; Guarantee the white slag refining time, dross inclusion adsorption and the S, the O constituent content that reduce in the steel; Use calcium is handled, and improves inclusion morphology; Vacuum-treat reduces H, N harmful element content; Finally obtain the better continuously cast bloom of internal soundness.
5. the oceanographic engineering of strain aging excellent property according to claim 4 is characterized in that with the working method of steel plate: the continuous casting steel billet thickness that obtains is 260mm, and oceanographic engineering uses the thickness of steel plate to be 80mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102851623A (en) * | 2012-09-19 | 2013-01-02 | 南京钢铁股份有限公司 | Marine engineering F36-Z35 steel plate 80mm in thickness and production method thereof |
| CN104532147A (en) * | 2014-12-24 | 2015-04-22 | 舞阳钢铁有限责任公司 | S460G2+QT steel plate for fixed offshore platform and production method of steel plate |
| CN104762563A (en) * | 2015-05-07 | 2015-07-08 | 湖南华菱湘潭钢铁有限公司 | Hardened and tempered steel plate production method |
| CN105925894A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Super-thick high-strength lamellar-tearing-resistant Q500D-Z35 hydroelectric generating set steel plate and manufacturing method thereof |
| CN109097683A (en) * | 2018-08-24 | 2018-12-28 | 南京钢铁股份有限公司 | A kind of thick low cost FH420 marine worker steel plate of 80mm and its manufacturing method |
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| CN113943897A (en) * | 2021-10-18 | 2022-01-18 | 南京钢铁股份有限公司 | Offline quenched and tempered EH960 ultrahigh-strength marine steel plate and manufacturing method thereof |
| CN114351050A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Flexible production method of steel for pressure container |
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| CN102851623A (en) * | 2012-09-19 | 2013-01-02 | 南京钢铁股份有限公司 | Marine engineering F36-Z35 steel plate 80mm in thickness and production method thereof |
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| CN105925894A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Super-thick high-strength lamellar-tearing-resistant Q500D-Z35 hydroelectric generating set steel plate and manufacturing method thereof |
| CN109097683A (en) * | 2018-08-24 | 2018-12-28 | 南京钢铁股份有限公司 | A kind of thick low cost FH420 marine worker steel plate of 80mm and its manufacturing method |
| WO2020038244A1 (en) * | 2018-08-24 | 2020-02-27 | 南京钢铁股份有限公司 | 80mm-thick low-cost fh420 marine steel plate and manufacturing method therefor |
| CN109097683B (en) * | 2018-08-24 | 2020-08-18 | 南京钢铁股份有限公司 | 80 mm-thick low-cost FH420 maritime work steel plate and manufacturing method thereof |
| CN109439857A (en) * | 2018-11-21 | 2019-03-08 | 南京钢铁股份有限公司 | A kind of FO460 marine worker slab and its manufacturing method |
| CN113943897A (en) * | 2021-10-18 | 2022-01-18 | 南京钢铁股份有限公司 | Offline quenched and tempered EH960 ultrahigh-strength marine steel plate and manufacturing method thereof |
| CN114351050A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Flexible production method of steel for pressure container |
| CN114351050B (en) * | 2022-01-07 | 2022-10-18 | 鞍钢股份有限公司 | Flexible production method of steel for pressure container |
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Application publication date: 20121219 |