CN102392192B - Steel plate with thickness of 80mm and low compression ratio for ocean engineering and manufacturing method thereof - Google Patents
Steel plate with thickness of 80mm and low compression ratio for ocean engineering and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to steel for ocean engineering and a manufacturing method thereof, in particular to a steel plate with a thickness of 80mm and a low compression ratio for ocean engineering and a manufacturing method thereof. The steel plate comprises the chemical components with the weight percentages as follows: 0.12 to 0.16 percent of C, 0.20 to 0.40 percent of Si, 1.20 to 1.60 percent of Mn, smaller than or equal to 0.010 percent of P, smaller than or equal to 0.003 percent of S, 0.025 to 0.050 percent of Nb, 0.030 to 0.050 percent of V, 0.010 to 0.020 percent of Ti, smaller than or equal to 0.20 percent of Cr, 0.10 to 0.40 percent of Ni, smaller than or equal to 0.20 percent of Cu, smaller than or equal to 0.08 percent of Mo, 0.0250 to 0.050 percent of Al, smaller than or equal to 20ppm of O, smaller than or equal to 40ppm of N, smaller than or equal to 3ppm of H, and the remaining amount of Fe and inevitable impurities. A controlled rolling and cooling technology is adopted, the heating temperature before rolling is 1180 DEG C to 1250 DEG C, the rough rolling temperature is 1000 to 1100 DEG C, and the finish rolling starting temperature is 850 to 880 DEG C; laminar cooling is conducted after the rolling, the final cooling temperature is 640 to 680 DEG C, and the cooling rate is 5 to 15 DEG C/s; and normalizing treatment is conducted, the normalizing temperature is 890 to 910 DEG C, the heating rate is 1.4min/mm, and the heat preservation time is 50 to 90min. The obtained steel has the characteristics of high strength, good Z-direction lamellar tearing resistant performance, high plasticity, and the like.
Description
Technical field
The present invention relates to a kind of oceanographic engineering with steel and method of manufacture thereof, the thick low compression ratio oceanographic engineering of a kind of specifically 80mm is with steel plate and method of manufacture thereof.
Background technology
Along with constant development of economy; Various countries are to oil and natural gas energy demand sharp increase; Land resources is fewer and feweri; The difficulty of exploitation is increasing, and the marine oil natural gas source becomes new exploitation growth point, and the oceanographic engineering equipment manufacture also becomes the major fields that countries in the world, particularly energy shortage state put forth effort to develop thereupon.
The high-strong toughness E36-Z35 steel plate of thickness 60～80mm is that the oceanographic engineering key position is used steel, is applied in the severe ocean Working environment such as tide, wave, storm, cold floating ice, supports ocean platform and drilling outfit that gross weight surpasses hundreds of tons.These use characteristic have determined the high-strong toughness E36-Z35 steel plate of thickness 60～80mm to have: 1. high cleanliness, low S, P, inclusion and gas content; 2. high-strong toughness, satisfy thickness of slab 1/4 place～40 ℃ ballistic work vertically>=50J (or laterally>=34J); 3. good Z is to anti-lamellar tearing performance; 4. good weldability; Performance index such as
HS.So that guarantee the safe of operating personnel and work better, in the work-ing life of improving ocean platform simultaneously, reduce use cost.
Present domestic minority enterprise has possessed the high-strong toughness E36-Z35 steel plate ability of producing 80mm, but thickness of strand all >=300mm, and milling train uses 4300 or the wide and heavy plate mill of 5000mm, mill rolling force is big.The wide plate mill of the continuous casting material of the following blank of the present domestic 300mm of steel mill and 2690～3500mm is more, but does not have the production technology of the thick oceanographic engineering of 80mm of this type of blank and milling train with the E36-Z35 steel plate.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides the thick low compression ratio oceanographic engineering of a kind of 80mm with steel plate and method of manufacture thereof, and suitability is wide, be fit to the domestic majority Heavy Plate Plant and produce, and stable processing technique, rigidity can be good.
The technical scheme that the present invention solves above technical problem is:
The thick low compression ratio oceanographic engineering of a kind of 80mm is used steel plate, and ⑴ continuous casting steel billet thickness is 2260mm, and steel plate thickness is 80mm, and compression ratio is merely 3.25:1; ⑵ this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.12～0.16%, Si:0.20～0.40%, Mn:1.20～1.60%, P≤0.010%, S≤0.003%; Nb:0.025～0.050%, V:0.030～0.050%, Ti:0.010～0.020%, Cr≤0.20%; Ni:0.10～0.40%, Cu≤0.20%, Mo≤0.08%, Al:0.0250～0.050%; O≤20 ppm, N≤40 ppm, H≤3ppm, surplus is Fe and unavoidable impurities.
Make the method for the thick low compression ratio oceanographic engineering of 80mm, comprise following technology with steel plate:
Steel-making and continuous casting process: target sulphur≤0.005% 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, white slag hold-time>=10 minute, refining total time>=30 minute; Vacuum-treat hold-time>=15 minute; Carrying out calcium after the vacuum-treat handles; The bag target temperature is liquidus temperature+(10～20) ℃ 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 1180 ℃～1250 ℃ before rolling; 1000～1100 ℃ of roughing temperature; 850～880 ℃ of finish rolling start rolling temperatures; Roll back laminar flow cooling, 640～680 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 890～910 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 50～90min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses steel plate.
Smelting and control according to 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; Accumulative total draft in three roads is greater than 24% after the finish rolling, through not inducing ferritic mechanism and suitable cooling control technology (640～680 ℃ of final cooling temperatures, 5～15 ℃ of rate of cooling/s), the purpose of controlled grain size in the low temperature gross distortion of crystallizing field; Normalizing temperature is controlled at 890～910 ℃; Cooperate suitable soaking time (50～90min); Can crystal grain thinning, can eliminate most banded structure again, thereby obtain that crystal grain is tiny, the thick low compression ratio oceanographic engineering of 80mm of homogeneous microstructure, excellent property uses steel plate.
The technical scheme that the present invention further limits is:
The thick low compression ratio oceanographic engineering of aforesaid 80mm is used steel plate, and this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.13%, Si:0.30%, Mn:1.45%, P:0.009%; S:0.0020%, Nb:0.030%, V:0.035%, Ti:0.017%, Cr:0.09%; Ni:0.20%, Cu:0.11%, Mo:0.06%, Al:0.04%; O:0.0012%, N:0.0035%, H:0.00015%, surplus is Fe and unavoidable impurities.
The thick low compression ratio oceanographic engineering of aforesaid 80mm is used steel plate, and this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.15%, Si:0.25%, Mn:1.40%, P:0.008%; S:0.0018%, Nb:0.040%, V:0.041%, Ti:0.014%, Cr:0.12%; Ni:0.30%, Cu:0.09%, Mo:0.05%, Al:0.035%; O:0.0011%, N:0.0038%, H:0.00018%, surplus is Fe and unavoidable impurities.
The thick low compression ratio oceanographic engineering of aforesaid 80mm is used steel plate, and this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.12%, Si:0.40%, Mn:1.20%, P:0.010%; S:0.0015%, Nb:0.025%, V:0.050%, Ti:0.010%, Cr:0.20%; Ni:0.40%, Cu:0.15%, Mo:0.08%, Al:0.025%; O:0.0020%, N:0.0040%, H:0. 0.00030%, and surplus is Fe and unavoidable impurities.
The thick low compression ratio oceanographic engineering of aforesaid 80mm is used steel plate, and this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.16%, Si:0.20%, Mn:1.60%, P:0.005%; S:0.0030%, Nb:0.050%, V:0.030%, Ti:0.020%, Cr:0.10%; Ni:0.10%, Cu:0.20%, Mo:0.07%, Al:0.050%; O:0.0015%, N:0.0028%, H:0.00020%, surplus is Fe and unavoidable impurities.
The invention has the beneficial effects as follows:
1, within the chemical ingredients scope of GB712 and nine big surveying society standards; Develop the thick oceanographic engineering of low compression ratio (compression ratio is 3.25:1 only) 80mm and use 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; 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; 890～910 ℃ normalizing temperature, crystal grain thinning, uniform formation improves performance.
3, method of manufacture of the present invention, stable processing technique, mechanical property is good.
Description of drawings
Fig. 1 is that embodiments of the invention 1 thickness of slab 1/4 is in the typical figure of tissue topography under the metaloscope.
Fig. 2 is that embodiments of the invention 2 thicknesss of slab 1/4 are in the typical figure of tissue topography under the metaloscope.
Fig. 3 is that embodiments of the invention 3 thicknesss of slab 1/4 are in the typical figure of tissue topography under the metaloscope.
Fig. 4 is that embodiments of the invention 4 thicknesss of slab 1/4 are in the typical figure of tissue topography under the metaloscope.
Embodiment
Embodiment 1～
4
The thick low compression ratio oceanographic engineering of the 80mm of embodiment 1～4 is as shown in table 1 with E36-Z35 steel plate chemical ingredients:
Table 1
The thick low compression ratio oceanographic engineering of 80mm of enforcement 1～4 is following with E36-Z35 steel plate working method:
The thick low compression ratio oceanographic engineering of the 80mm of embodiment 1 is with the working method of E36-Z35 steel plate embodiment, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.005% 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 30 minutes; 15 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, high temperature low speed is depressed rolling greatly, the first road passage draught 32mm; 850 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 25%; Roll back laminar flow cooling, 640 ℃ of final cooling temperatures, 5 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 890 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 50min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses the E36-Z35 steel plate.
The thick low compression ratio oceanographic engineering of the 80mm of embodiment 2 is with the working method of E36-Z35 steel plate embodiment, 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, 12 minutes white slag hold-times, guarantees refining total time 35 minutes; 16 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, high temperature low speed is depressed rolling greatly, the first road passage draught 31mm; 880 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 26%; Roll back laminar flow cooling, 680 ℃ of final cooling temperatures, 15 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 910 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 90min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses the E36-Z35 steel plate.
The thick low compression ratio oceanographic engineering of the 80mm of embodiment 3 is with the working method of E36-Z35 steel plate embodiment, 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, 13 minutes white slag hold-times, guarantees refining total time 32 minutes; 18 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; 105 ℃ of roughing temperature, high temperature low speed is depressed rolling greatly, the first road passage draught 34mm; 865 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 28%; Roll back laminar flow cooling, 650 ℃ of final cooling temperatures, 10 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 895 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 60min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses the E36-Z35 steel plate.
The thick low compression ratio oceanographic engineering of the 80mm of embodiment 4 is with the working method of E36-Z35 steel plate embodiment, and is specific as follows:
Steel-making and continuous casting process: target sulphur 0.0025% 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 36 minutes; 17 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 1230 ℃ before rolling; 1080 ℃ of roughing temperature, high temperature low speed is depressed rolling greatly, the first road passage draught 36mm; 870 ℃ of finish rolling start rolling temperatures, three roads, back accumulation draft 28%; Roll back laminar flow cooling, 665 ℃ of final cooling temperatures, 9 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 905 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 75min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses the E36-Z35 steel plate.
Fig. 1 obtains E36-Z35 steel plate thickness of slab 1/4 to be in the typical figure of tissue topography under the metaloscope after embodiment 1 normalizing treatment; Fig. 2 obtains E36-Z35 steel plate thickness of slab 1/4 to be in the typical figure of tissue topography under the metaloscope after embodiment 2 normalizing treatment; Fig. 3 obtains E36-Z35 steel plate thickness of slab 1/4 to be in the typical figure of tissue topography under the metaloscope after embodiment 3 normalizing treatment; Fig. 4 obtains E36-Z35 steel plate thickness of slab 1/4 to be in the typical figure of tissue topography under the metaloscope after embodiment 4 normalizing treatment; Fig. 1～Fig. 4 is organized as ferritic+pearlitic structure, and crystal grain is comparatively tiny evenly, and grain fineness number is 8.5 grades.
After the normalizing, 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 and Z are to performance such as table 3.
Table 2
Table 3
Can find out by table 2 and table 3; Embodiment 1～4 mechanical property is far superior to E36-Z35 requirement in GB712 and the nine big surveying society standards; Ys >=364 MPa, tensile strength >=519 MPa, unit elongation >=29%; Z satisfies the requirement of the thick oceanographic engineering of 80mm with the E36N-Z35 steel plate to sectional shrinkage >=70%.Have stable processing technique, mill capacity is required the characteristics less, that compression ratio is little.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. the thick low compression ratio oceanographic engineering of 80mm is with the method for manufacture of steel plate,
⑴ continuous casting steel billet thickness is 260mm, and steel plate thickness is 80mm, and compression ratio is merely 3.25:1;
⑵ this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.12～0.16%, Si:0.20～0.40%, Mn:1.20～1.60%, P≤0.010%, S≤0.003%; Nb:0.025～0.050%, V:0.030～0.050%, Ti:0.010～0.020%, Cr≤0.20%; Ni:0.10～0.40%, Cu≤0.20%, Mo≤0.08%, Al:0.0250～0.050%; O≤20 ppm, N≤40 ppm, H≤3ppm, surplus is Fe and unavoidable impurities;
It is characterized in that: method of manufacture comprises following technology:
Steel-making and continuous casting process: target sulphur≤0.005% 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, white slag hold-time>=10 minute, refining total time>=30 minute; Vacuum-treat hold-time>=15 minute; Carrying out calcium after the vacuum-treat handles; The bag target temperature is that liquidus temperature adds 10～20 ℃ 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 1180 ℃～1250 ℃ before rolling; 1000～1100 ℃ of roughing temperature; 850～880 ℃ of finish rolling start rolling temperatures; Roll back laminar flow cooling, 640～680 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: carry out normalizing treatment, normalizing temperature is 890～910 ℃, and temperature rise rate is 1.4min/mm, and soaking time is 50～90min, obtains the thick low compression ratio oceanographic engineering of 80mm and uses steel plate.
2. the thick low compression ratio oceanographic engineering of 80mm as claimed in claim 1 is characterized in that with the method for manufacture of steel plate: this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.13%, Si:0.30%, Mn:1.45%; P:0.009%, S:0.0020%, Nb:0.030%, V:0.035%; Ti:0.017%, Cr:0.09%, Ni:0.20%, Cu:0.11%; Mo:0.06%, Al:0.04%, O:0.0012%; N:0.0035%, H:0.00015%, surplus is Fe and unavoidable impurities.
3. the thick low compression ratio oceanographic engineering of 80mm as claimed in claim 1 is characterized in that with the method for manufacture of steel plate: this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.15%, Si:0.25%, Mn:1.40%; P:0.008%, S:0.0018%, Nb:0.040%, V:0.041%; Ti:0.014%, Cr:0.12%, Ni:0.30%, Cu:0.09%; Mo:0.05%, Al:0.035%, O:0.0011%; N:0.0038%, H:0.00018%, surplus is Fe and unavoidable impurities.
4. the thick low compression ratio oceanographic engineering of 80mm as claimed in claim 1 is characterized in that with the method for manufacture of steel plate: this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.12%, Si:0.40%, Mn:1.20%; P:0.010%, S:0.0015%, Nb:0.025%, V:0.050%; Ti:0.010%, Cr:0.20%, Ni:0.40%, Cu:0.15%; Mo:0.08%, Al:0.025%, O:0.0020%; N:0.0040%, H:0.00030%, surplus is Fe and unavoidable impurities.
5. the thick low compression ratio oceanographic engineering of 80mm as claimed in claim 1 is characterized in that with the method for manufacture of steel plate: this steel plate chemical ingredients is composed of the following components by weight percentage: C:0.16%, Si:0.20%, Mn:1.60%; P:0.005%, S:0.0030%, Nb:0.050%, V:0.030%; Ti:0.020%, Cr:0.10%, Ni:0.10%, Cu:0.20%; Mo:0.07%, Al:0.050%, O:0.0015%; N:0.0028%, H:0.00020%, surplus is Fe and unavoidable impurities.
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