CN102691018A - Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof - Google Patents
Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a low-compression ratio super-strength steel plate for ocean engineering and a manufacturing method thereof. The super-strength steel plate for ocean engineering comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.60-1.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0080% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.90-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.40% of Cu, 0.40-0.60% of Mo, and the balance of Fe and inevitable impurities. The laboratory smelting, trial rolling on a rolling mill, TMCP (thermal mechanical control processing) technology and thermal refining are sequentially performed, thus the super strength, high toughness, weldability and manufacturability of the super-strength steel plate for ocean engineering are realized.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of steel plate and working method thereof, especially a kind of low compression ratio superstrength oceanographic engineering is with steel plate and working method thereof.
Background technology
The 21 century mankind have got into the New Times of development and use oceans, and international with exploitation with to occupy oceanic resources be that the ocean right-safeguarding struggle of core grows in intensity, the trial of strength of the ocean science strength that accompanies with it also highlights day by day.A host of facts show that ocean science has got into the forward position of global science and technology competition, and become one of focus of comprehensive strength trial of strength between country.The development of ocean science be unable to do without ferrous materials, and oceanographic engineering increases with the steel market requirement, and development prospect is wide.The superstrength oceanographic engineering with steel plate because it has superstrength, good impelling strength, cold formability and good solderability has been widely used in the oceanographic engineering equipment; The oceanographic engineering equipment is mainly used in probing, exploitation and the exploitation of relevant auxiliary products of offshore oil and gas; Have characteristics such as hi-tech, high investment, high added value and excessive risk; Very high to reliability of products and security requirement, become national governments in recent years and given special assistance to the strategic industry of development and the high-end field that shipbuilding enterprise competitively competes.Because the oceanographic engineering equipment is the heavy construction structural part that under the corrosive atmosphere of harshness, uses, its underwater portion structure receives the erosion of seawater and marine life for a long time, therefore has relatively high expectations with erosion resistance to low temperature resistant.Along with oceanographic engineering equipment maximizes, anti-seawater impact capacity, hope the superstrength oceanographic engineering with steel plate except having above-mentioned performance, also need satisfy big thickness requirement.And domestic many steel production enterprise are produced high-strength machined steel; Adopt the continuous casting mode of production; With respect to die casting, slab thickness is generally less, and slab thickness is lower than 220mm usually; For low-alloy high-strength steel plate that satisfy to produce 80 mm and above thick specification, this is undoubtedly one of difficult problem that numerous producers need overcome low compression ratio.
In order to solve an above-mentioned difficult problem, utilize vacuum metling, explore low compression ratio and produce the feasibility of the strong oceanographic engineering of superelevation of big thickness specification with steel.As a rule, the intensity of steel is high more, the more difficult raising of plasticity and low-temperature flexibility.In order to have increased substantially intensity and the low-temperature flexibility of oceanographic engineering with steel; Obtain the good plasticity that is complementary with the HS and the good low-temperature flexibility of steel with the superstrength oceanographic engineering simultaneously; Need rational alloying; Through reasonable process, make steel obtain the ideal tissue morphology, could satisfy steel and can under abominable ocean environment, use.
The existing patent that relates to oceanographic engineering with the working method of steel mainly is to obtain oceanographic engineering through controlled rolling and controlled cooling or heat treating method to use steel plate, and concrete working method is following:
Chinese patent CN 102400043 provides a kind of big thickness oceanographic engineering with steel plate and working method thereof, and it is through microalloying, through electrosmelting, the vacuum deaeration of VD stove; Pull into the 330mm thick stock, carry out two stage rolling subsequently, carry out modifier treatment at last; The big thickness oceanographic engineering that has obtained steel plate thickness and be 150mm is used steel plate; Ys is more than 460MPa, and tensile strength is between 530～650MPa, and-40 ℃ ballistic work is excellent.But this steel grade intensity is on the low side, and only provides-40 ℃ of low-temperature impact works, does not have clear and definite impact specimen sampling direction.
Chinese patent CN 102392192 provides the thick low compression ratio oceanographic engineering of a kind of 80mm with steel plate and method of manufacture, adopts cooling controlling and rolling controlling process to combine normalizing treatment, and finally organizing rank is ferritic and perlite.Because carbon in its steel, manganese content are high relatively, from the organization chart that provides, have certain banded structure.And intensity is lower, and ys is between 360 ~ 370 MPa.
Summary of the invention
Deficiency in view of above prior art; In order to realize superstrength, H.T., weldability and the producibility of the strong oceanographic engineering of superelevation with steel plate; The purpose of this invention is to provide a kind of low compression ratio superstrength oceanographic engineering with steel plate and working method thereof, this method is through the rational chemical design, and the reasonable compression ratio of rolling sequence and TMCP control; And rational hardening and tempering process, the strong oceanographic engineering of superelevation that has obtained excellent performance is used steel plate.
The objective of the invention is to realize through following technical scheme:
A kind of low compression ratio superstrength oceanographic engineering is used steel plate, it is characterized in that: the chemical ingredients of this steel plate by weight percentage, C:0.04～0.07%, Si:0.10～0.30%; Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%; V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%; Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and unavoidable impurities.
The tiny tempered sorbite of sheet interlayer spacing that is organized as of the present invention.Because the chemical ingredients of steel is one of key factor that influence continuously cast bloom internal soundness and High Strength Steel Plate performance, the present invention is in order to make said steel acquisition excellent comprehensive performance, and the chemical ingredients of said steel is limited, and reason is:
C: carbon is the principal element that influences the superstrength steel mechanical property, and to be lower than 0.04 intensity low when carbon content, and then there is the shortcoming of toughness and weldability variation in too high levels.In order to alleviate the later welded difficulty, carbon content of the present invention is controlled at 0.04～0.07%.
Si: silicon is the bioelement of deoxidation in steel making, also has certain solution strengthening effect, in the present invention silicon is limited to 0.10～0.30%.
Mn: manganese is to thinning microstructure, and it is favourable to improve intensity and toughness.In quenched and tempered steel, can increase the hardening capacity of steel, and with low cost.The manganese too high levels then can cause the continuously cast bloom segregation in actual production; For steel of the present invention, low-temperature flexibility is required than higher, so manganese content is controlled at 1.60～1.80% among the present invention.
Nb: the solute effect of dragging of trace niobium and Nb all suppress the austenitic recrystallize of deformation to the pinning effect of austenite grain boundary, and when the tempering of cooling or modifier treatment, form precipitate, thereby the intensity of making and toughness all are improved.In the steel of the present invention, addition reduces greater than 0.050% o'clock toughness less than 0.030% o'clock DeGrain, is prone to cause the continuously cast bloom surface crack, in addition welding property is also had the deterioration effect.Therefore, content of niobium should be controlled at 0.030～0.050%.
V: vanadium is the good reductor of steel.But add vanadium thinning microstructure crystal grain in the steel, improve intensity and toughness.During tempering or welding form carbide during postcooling, help gaining in strength.Addition was less than 0.020% o'clock DeGrain, and greater than 0.060% o'clock, the toughness of steel and weldability reduced.Therefore, content of vanadium should be controlled in 0.020～0.060% the scope.
Ti: titanium is the nitrogen element that is used for fixing in the steel, and under proper condition, titanium, nitrogen form titanium nitride, stops steel billet grain growth in heating, rolling, welding process, improves the toughness of mother metal and welded heat affecting zone.Titanium is lower than at 0.006% o'clock, and nitrogen fixation effect is poor, surpasses at 0.015% o'clock, and nitrogen fixation effect reaches capacity, and superfluous titanium can make the toughness of steel worsen.So in the present invention, in conjunction with nitrogen in steel content span of control in the actual production, with the titanium Composition Control 0.006～0.015%.
Cr, Cu: chromium and copper are the elements that improves steel hardenability, can suppress polygonal ferrite and pearlitic formation, promote low temperature to organize bainite or martensitic transformation, are one of normal elements that adds of quenched and tempered steel.But Cr and Cu too high levels will influence the toughness of steel, and cause temper brittleness, and chromium content is controlled at 0.30～0.60% among the present invention, and copper content is controlled at 0.20～0.40%.
Mo: with Cr sclerosis can be increased, can increase cost during heavy addition, and reduce toughness and weldability, be limited in below 0.80%.During tempering, form carbide particle, thereby help precipitation strength.Molybdenum content is controlled at 0.40～0.60%.
Impurity element in the steel like S, P etc., increases continuously cast bloom segregation degree, the low-temperature flexibility of the said steel of heavy damage welding zone.Therefore, sulphur, phosphorus content should be controlled at respectively≤0.010% and≤below 0.0080%.
A kind of low compression ratio superstrength oceanographic engineering is characterized in that with the working method of steel plate this working method comprises following operation:
Smelting technology: adopt vacuum induction furnace smelting, select the lower steel scrap of impurity element, carry out microalloying, smelt into steel ingot, forge into base subsequently, forge temperature between 1000～1100 ℃.The chemical ingredients of steel billet meets by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%; P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%; Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%; Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and unavoidable impurities.
Rolling technology: adopt cooling controlling and rolling controlling process; Continuous blank heating temperature is between 1180 ℃～1220 ℃ before rolling; Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district; Every time draft 12～25% of roughing, 1000～1080 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5～2 times of finished product thicknesses; The finish rolling start rolling temperature is 830～850 ℃, rolls the back and adopts laminar flow cooling, 470～550 ℃ of final cooling temperatures, 10～20 ℃/s of rate of cooling, air cooling subsequently.
Thermal treatment process: the steel plate behind the air cooling is heated again, and Heating temperature is at Ac
3On 30～80 ℃ carry out austenite phase region quench treatment; Quenching temperature is at 900～930 ℃; Soaking time is 2min/mm * thickness of slab, and the back steel plate that quenches has obtained the uniform hardening lath martensite, and original austenite grains is tiny; Quench the back 580～630 ℃ of tempering, and tempering insulation time is 2min/mm * thickness of slab+30min.
The present invention is through reasonable component control; Utilize and reasonably depress, obtained a kind of superstrength oceanographic engineering and used steel, be organized as tempered sorbite than assignment system degree, TMCP technology, quenching-and-tempering process; Sheet interlayer spacing is comparatively tiny, and original austenite grain is tiny, even.Steel of the present invention has superstrength, the excellent more high performance of low-temperature flexibility, plasticity is had a few.The concrete performance of ultrahigh-strength steel that obtains through the present invention is: the tensile strength of material is 810～880MPa, and ys is 710～810MPa, and unit elongation is 18～22% ,-65 ℃ of low temperature transverse impact >=60J.Has stable processing technique, characteristics such as workable.
The present invention has following advantage:
1, under the prerequisite of the TMCP technology of utilizing the rational chemical design and being easy to realize aborning,, just can obtain the tiny tempered sorbite of sheet interlayer spacing, homogeneous microstructure through the modified heat treating method of off-line.
2, through the brief heat treating method; Give full play to the strengthening effect of the microalloy element that steel has little time to separate out in the TMCP process, the tensile strength of steel is risen, and through the tempering heat treatment mode; Make in the steel lamella in the martensite be transformed into softer ferritic phase relatively; Unit elongation is risen, and low-temperature impact toughness improves ,-65 ℃ of low-temperature impact >=60J.
3, method of manufacture of the present invention need not increase any equipment, and just through the control of rational TMCP, the strong oceanographic engineering of superelevation that just can obtain low compression ratio is used steel.
4, method of manufacture of the present invention, interval similar consistent through modified thermal treatment with the modified thermal treatment temp of common steel plate, be convenient to plan as a whole tissue production with other steel grade, save industry row's product time.
5, method of manufacture of the present invention for ultrahigh-strength steel plates manufacturing like this, need not the rolling of big rolling load, ultrafast cool equipment, as long as on the conventional mill with cooling apparatus under.Through simple T MCP and off-line thermal treatment, can guarantee that just the ultrahigh-strength steel of producing obtains good obdurability coupling, higher plasticity.Technology is easy, and performance quality is stable.
The present invention has realized superstrength, H.T., weldability and the producibility of the strong oceanographic engineering of superelevation with steel plate.
Description of drawings
Fig. 1 be embodiment 1 after modifier treatment in steel plate thickness direction 1/4 place typical organization.
Embodiment
A kind of low compression ratio superstrength oceanographic engineering of the present invention is used steel plate, in this steel plate the chemical ingredients of steel by weight percentage, C:0.04～0.07%, Si:0.10～0.30%; Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%; V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%; Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and unavoidable impurities.
According to production technique of the present invention, it is as shown in table 1 to smelt the actual chemical ingredients of rolling steel grade of the present invention.
The chemical ingredients of table 1 embodiment of the invention (wt%)
| Embodiment | C | Si | Mn | P | S | Nb | Ti | Ni | Cr | Cu | Mo | V |
| Embodiment 1 | 0.065 | 0.22 | 1.76 | 0.0078 | 0.0075 | 0.040 | 0.012 | 1.00 | 0.31 | 0.31 | 0.49 | 0.032 |
| Embodiment 2 | 0.055 | 0.25 | 1.69 | 0.0080 | 0.0069 | 0.036 | 0.011 | 1.20 | 0.56 | 0.20 | 0.45 | 0.037 |
| Embodiment 3 | 0.042 | 0.20 | 1.65 | 0.0081 | 0.0051 | 0.044 | 0.011 | 1.18 | 0.38 | 0.36 | 0.48 | 0.023 |
| Embodiment 4 | 0.060 | 0.18 | 1.72 | 0.0073 | 0.0073 | 0.048 | 0.009 | 1.26 | 0.42 | 0.25 | 0.55 | 0.033 |
A kind of low compression ratio superstrength oceanographic engineering comprises following operation with the working method of steel plate:
Adopt vacuum induction furnace smelting, select the lower steel scrap of impurity element, carry out microalloying, smelt into steel ingot, steel ingot forges into the rectangular parallelepiped steel billet subsequently, forges temperature between 1000～1100 ℃, and the steel billet cross section is 90 * 90 mm.
Rolling technology of the present invention is following, adopts cooling controlling and rolling controlling process, and continuous blank heating temperature is between 1180 ℃～1220 ℃ before rolling.Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district.Wherein embodiment 1, embodiment 2 and embodiment 3 are rolled into 25mm test steel plate; Embodiment 4 is rolled into 30mm test steel plate; Rolling 3+2 two stage rolling of taking; Embodiment 1, embodiment 2 and embodiment 3 reduction systems are: 90mm → 75 mm → 65 mm → 50mm → 37mm → 25 mm, and embodiment 4 reduction systems are: 90mm → 75 mm → 65 mm → 55mm → 42mm → 30 mm, with postcooling.Concrete processing parameter is seen table 2.
Table 2 rolling technological parameter table
| Embodiment | Final thickness/mm | The roughing start rolling temperature/℃ | The roughing finishing temperature/℃ | Intermediate blank thickness/mm | The finish rolling start rolling temperature/℃ | Finishing temperature/℃ | Open cold temperature/℃ | Cooling time/s | Final cooling temperature/℃ |
| Embodiment 1 | 25 | 1085 | 1034 | 50 | 840 | 837 | 740 | 17 | 520 |
| Embodiment 2 | 25 | 1053 | 1042 | 50 | 845 | 832 | 724 | 17 | 497 |
| Embodiment 3 | 25 | 1068 | 1029 | 50 | 848 | 835 | 716 | 18 | 480 |
| Embodiment 4 | 30 | 1076 | 1052 | 55 | 843 | 840 | 730 | 20 | 485 |
Thermal treatment process: the steel plate behind the air cooling is heated again, and Heating temperature is at Ac
3On 30～80 ℃ carry out austenite phase region quench treatment; Quenching temperature is at 900～930 ℃; Quenching Soaking Time is 2min/mm * thickness of slab, and the back steel plate that quenches has obtained the uniform hardening lath martensite, and original austenite grains is tiny; Quench the back 580～630 ℃ of tempering, and tempering insulation time is 2min/mm * thickness of slab+30min.Concrete processing parameter is seen table 3.
Table 3 heat treatment process parameter table
According to performance such as table 4 that technology of the present invention obtains, the embodiment 1 typical tempered sorbite metallographic structure in steel plate thickness direction 1/4 place pattern after modifier treatment is seen Fig. 1, and is visible by figure, is organized as tempered sorbite, and sheet interlayer spacing is comparatively tiny evenly.
The sheet material mechanical property that obtains after the modified thermal treatment of table 4 embodiment of the invention
The tensile strength of material is 810～880MPa, and ys is 710～810MPa, and unit elongation is 18～22% ,-65 ℃ of low temperature transverse impact >=60J.Has stable processing technique, characteristics such as workable.
Claims (4)
1. a low compression ratio superstrength oceanographic engineering is used steel plate, it is characterized in that: the chemical ingredients of this steel plate by weight percentage, C:0.04～0.07%, Si:0.10～0.30%; Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%; V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%; Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and unavoidable impurities.
2. low compression ratio superstrength oceanographic engineering according to claim 1 is used steel plate, it is characterized in that: this steel plate is organized as the tiny tempered sorbite of sheet interlayer spacing.
3. the described low compression ratio superstrength of claim 1 oceanographic engineering is characterized in that with the working method of steel plate this working method comprises following operation:
Smelting technology: adopt vacuum induction furnace smelting, carry out microalloying, smelt into steel ingot, forge into base subsequently, forge temperature between 1000～1100 ℃; The chemical ingredients of steel billet meets by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%; P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%; Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%; Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and unavoidable impurities;
Rolling technology: adopt cooling controlling and rolling controlling process; Continuous blank heating temperature is between 1180 ℃～1220 ℃ before rolling; Adopt austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district; Every time draft 12～25% of roughing, 1000～1080 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5～2 times of finished product thicknesses; The finish rolling start rolling temperature is 830～850 ℃, rolls the back and adopts laminar flow cooling, 470～550 ℃ of final cooling temperatures, 10～20 ℃/s of rate of cooling, air cooling subsequently;
Thermal treatment process: the steel plate behind the air cooling is heated again, and Heating temperature is at Ac
3On 30～80 ℃ carry out austenite phase region quench treatment; Quenching temperature is at 900～930 ℃, and steel plate has obtained the uniform hardening lath martensite after the quenching and preserving heat, and original austenite grains is tiny; Quench the back 580～630 ℃ of tempering insulations, obtain low compression ratio superstrength oceanographic engineering and use steel plate.
4. low compression ratio superstrength oceanographic engineering according to claim 3 is characterized in that with the working method of steel plate: in the thermal treatment process, Quenching Soaking Time is 2min/mm * thickness of slab, and tempering insulation time is 2min/mm * thickness of slab+30min.
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Application publication date: 20120926 |