CN104372257A - Low-alloy high-strength middle-thickness plate capable of utilizing self-tempering waste heat to improve toughness and preparation method of low-alloy high-strength middle-thickness plate - Google Patents
Low-alloy high-strength middle-thickness plate capable of utilizing self-tempering waste heat to improve toughness and preparation method of low-alloy high-strength middle-thickness plate Download PDFInfo
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Abstract
The invention discloses a low-alloy high-strength middle-thickness plate capable of utilizing self-tempering waste heat to improve toughness and a preparation method of the low-alloy high-strength middle-thickness plate. The low-alloy high-strength middle-thickness plate capable of utilizing self-tempering waste heat to improve toughness is prepared from the following chemical components in percentage by weight: 0.03-0.09% of C, 0.10-0.35% of Si, 0.80-1.7% of Mn, not greater than 0.015% of P, not greater than 0.0020% of S, 0.010-0.050% of Nb, 0.010-0.050% of V, 0.005-0.030% of Ti, 0.15-0.50% of Cr, 0.05-0.20% of Mo, and the balance of Fe and inevitable impurities. The preparation method of the low-alloy high-strength middle-thickness plate comprises the following steps: compounding other alloy elements by virtue of a reasonable low-carbon component design and a low-sulfur-phosphor smelting process so as to improve the quenching degree of the middle-thickness plate; and adopting a TMCP (thermal mechanical control processing) process to roll, and controlling separation of carbide and nitride of V by virtue of a reasonable heap-cooling process after controlled cooling, and releasing rolling stress. The low-alloy high-strength steel plate texture obtained by the preparation method disclosed by the invention is a mixed texture of acicular ferrite and granular bainite, wherein the original austenite crystal grains are uniform and fine. The preparation method disclosed by the invention is stable in production process, strong in operability, low in cost and high in performance.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of low-alloy high-strength high-ductility plate of moderate thickness and production method thereof, low-alloy high-strength plate of moderate thickness and the method for making thereof that red waste heat improves obdurability is returned in specifically a kind of utilization.
Background technology
Plate of moderate thickness product (as pressurized vessel, boiler, bridge, naval vessel, offshore platform, Highrise buildings and pipeline etc.) is the important ferrous materials of every country city, industry and Economic development.The development level of plate of moderate thickness product and production are the marks of a national development of iron & steel industry.Welded construction steel plate product almost accounts for the half of flat steel product steel products, and think the leading product of current pressurized vessel, boiler, bridge, boats and ships, ocean platform, Highrise buildings and pipeline field steel, and these fields constantly asking most technical indicators such as structure lightened, low manufacturing cost, high safety of structure, has driven worldwide plate of moderate thickness product development and engineer applied.
How plate of moderate thickness steel products have the direction that high strength, high tenacity and superior weldability coupling is the scholars' joint research of this field concurrently.Wherein improving armor plate strength is realize one of light-weighted effective way of steel plate, but according to traditional metallurgical principles, improve the inevitable to damage premised on toughness and weldability of armor plate strength, this is difficult to the technical requirements meeting high safety of structure and low manufacturing cost, and to reduce grain-size be realize the unique channel that steel plate has high-intensity high-tenacity matched well.
As a rule, engineering materials generally reaches good comprehensive mechanical property by multiple strengthening effect, and concrete grammar has solution strengthening, precipitation strength, dislocations strengthening, refined crystalline strengthening and second-phase strength etc.The intensity of steel is higher, plasticity and the more difficult raising of low-temperature flexibility.In order to increase substantially intensity and the processing characteristics of steel, obtain High Strength Steel and the excellent toughness matched and plasticity simultaneously, need reasonably to utilize alloying, pass through smelting technology, rolling technology and thermal treatment process, make steel obtain desirable tissue morphology, meet the processing and fabricating requirement of component.
The existing patent relating to production method at high-strength and high ductility steel plate, mainly obtain high tensile steel plate by controlled rolling and controlled cooling or heat treating method, concrete production method is as follows:
Chinese patent CN201110176684.7 provides a kind of Q690D high-quality structural steel plate of moderate thickness and production method thereof, this steel is by adjusting content and the ratio of C, Mn, Nb, V, Ti, Mo alloying element in Q690D, strict control P, S content, by the rolling of austenite recrystallization district and the rolling of austenite Unhydrated cement, rear ACC cooling rate 5 ~ 30 DEG C/s is rolled in control, red temperature, between 450 ~ 550 DEG C, can obtain Q690D high-quality structural steel.But this steel with the addition of the B of 0.05 ~ 0.15%, welded heat affecting zone ballistic work fluctuation ratio is comparatively large, can not reach the welding property that coupling is good.
Chinese patent CN201410240035.2 provides a kind of large wall thickness subsea pipeline plate of moderate thickness and production method, this steel is by casting 300, the thick continuously cast bloom of 400mm, 1170 ~ 1220 DEG C of insulation 280 ~ 450min are heated to through walking beam furnace, to come out of the stove laggard 4300mm milling train, adopt recrystallize and Unhydrated cement two-phase control rolling, wherein two-stage start rolling temperature 760 ~ 820 DEG C, finishing temperature 750 ~ 800 DEG C, after controlled rolling, ACC section cooling speed control is between 7 ~ 20 DEG C/s, returns red control between 400 ~ 500 DEG C.But this steel billet material thickness requirement 300,400mm, and two-stage rolling temperature is lower, between 750 ~ 820 DEG C, to continuous caster and milling equipment Capability Requirement higher.
Summary of the invention
In view of above the deficiencies in the prior art, consider the high strength of low-alloy high-strength high-ductility steel plate, high tenacity and weldability, the object of this invention is to provide a kind of utilization and return low-alloy high-strength plate of moderate thickness and the method for making thereof that red waste heat improves obdurability, the method is by rational chemical composition design, soft reduction technique, strictly the harmful element such as control S, P, alleviates center segregation degree, by TMCP technique, utilize and return the High Strength Low Alloy Medium Plate that red waste heat just can obtain stable performance.
The object of the invention is to be achieved through the following technical solutions:
The low-alloy high-strength plate of moderate thickness that red waste heat improves obdurability is returned in utilization, it is characterized in that: in this low-alloy high-strength plate of moderate thickness, the chemical composition of steel by weight percentage, C:0.03 ~ 0.09%, Si:0.10 ~ 0.35%, Mn:0.80 ~ 1.7%, P :≤0.015%, S :≤0.0020%, Nb:0.010 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.005 ~ 0.030%, Cr:0.15 ~ 0.50%, Mo:0.05 ~ 0.20%, surplus is Fe and inevitable impurity.This steel plate is organized as the mixed structure of acicular ferrite+granular bainite.
Chemical composition due to steel is one of key factor affecting continuously cast bloom internal soundness and high-strength and high ductility Plate properties, and the present invention obtains excellent over-all properties to make described steel, and limit the chemical composition of described steel, reason is:
C: carbon is the principal element affecting super-strength steel mechanical property, when carbon content is low lower than 0.03 intensity, content higher than 0.09% time, then there is the shortcoming of toughness and deteriorated weldability.Optimum interval is 0.03 ~ 0.09%.
Si: silicon is the bioelement of deoxidation in steel making, also have certain solution strengthening effect, but silicone content is too high, be then unfavorable for steel plate low-temperature flexibility and surface quality, consolidate in invention and be limited in the scope of 0.10 ~ 0.35% by silicon.
Mn: manganese has thinning microstructure, improves the effect of intensity and toughness in described steel, and Mn too high levels, then can cause the problems such as continuous casting slab segregation, poor toughness and weldability reduction, therefore in the present invention, Fe content controls in the scope of 0.80 ~ 1.70%.
Nb, Ti: namely niobium, titanium are solution strengthening element, having is carbide, and in heating steel billet and the operation of rolling, pinning austenite grain boundary also organizes growing up of original austenite grains, but its too high levels can affect toughness and weldability.Therefore, content of niobium should control in the scope of 0.010 ~ 0.050%, and Ti content controls in the scope of 0.005 ~ 0.030%.
V: the carbonitride of vanadium can be separated out at lesser temps, adding vanadium in slab can improve intensity.When tempering or after welding, carbide precipitate during cooling, gains in strength.DeGrain when addition is less than 0.010%, when being greater than 0.050%, the toughness of steel and weldability reduce.
Cr: chromium is the element improving steel hardenability, can suppress polygonal ferrite and pearlitic formation, in promotion, the transformation of temperature tissue, improves the intensity of steel.But Cr too high levels will affect the toughness of steel, and in the present invention, chromium content controls 0.15 ~ 0.50%.
Mo: molybdenum significantly can promote bainitic transformation, can increase cost during a large amount of interpolation, and reduce toughness and weldability, be limited in less than 0.20%.Generally be limited in 0.05 ~ 0.20%.
Impurity element in steel, as S, P etc., can increase continuous casting slab segregation degree, the low-temperature flexibility of steel described in grievous injury and welded heat affecting zone.Therefore, sulphur, phosphorus content should control respectively≤0.0020% and≤less than 0.015%.
The method for making that red waste heat improves the low-alloy high-strength plate of moderate thickness of obdurability is returned in utilization, it is characterized in that this production method comprises following operation:
1) smelting technology: adopt converter smelting, by top blast, abundant decarburization; Adopt RH or VD Fruit storage and LF process, reduce harmful element O, N, H, S, P content, carry out microalloying, then strand, the chemical composition of steel billet meets by weight percentage, C:0.03 ~ 0.09%, Si:0.10 ~ 0.35%, Mn:0.80 ~ 1.7%, P :≤0.015%, S :≤0.0020%, Nb:0.010 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.005 ~ 0.030%, Cr:0.15 ~ 0.50%, Mo:0.05 ~ 0.20%, surplus is Fe and inevitable impurity;
2) rolling technology: adopt cooling controlling and rolling controlling process, roll front continuous blank heating temperature between 1180 DEG C ~ 1250 DEG C, adopt austenite recrystallization district and the rolling of austenite Unhydrated cement two-stage control, roughing finishing temperature 1000 ~ 1100 DEG C, roughing becomes the intermediate blank of 1.5 ~ 4.5 times of finished product thicknesses; Finish rolling start rolling temperature is 840 ~ 900 DEG C, rolls rear employing section cooling, stops cold temperature 350 ~ 450 DEG C, and red temperature is 500 ~ 650 DEG C, de-stacking air cooling after cooling in heap 30 ~ 120min.
The present invention is designed by rational low-carbon (LC), low-sulfur phosphorus smelting technology, adding appropriate Mn coordinates the alloying elements such as Cr, Mo to improve plate of moderate thickness hardening capacity, and be aided with the trace elements such as Nb, V, Ti, give full play to solution strengthening, refined crystalline strengthening, precipitation strength and phase transformation strengthening effect and improve plate of moderate thickness intensity, improve plate of moderate thickness toughness by crystal grain thinning.Combined and rational blank design by the alloying element optimized, adopt strict blank heating system, controlled rolling makes steel plate deformed even, the abundant recrystallize of strand austenite crystal, adopt large soft reduction process during two-stage rolling as far as possible, accumulation deformation energy, relaxation is accurately adopted to control, control relaxation separate out and begin to cool down in suitable temperature, improve austenitic condensate depression, promote that ferrite forming core is with crystal grain thinning, controlling steel plate again, to stop cold temperature be 300 ~ 450 DEG C, due to the ultrafast cold rear heart portion of steel plate and surface temperature difference larger, heart portion temperature is delivered to surface, surface temperature is made to increase 50 ~ 300 DEG C to 500 ~ 600 DEG C, and the C of V, N compound separates out peak temperature just in this temperature range, and cooling in heap after steel plate is rolled off the production line, now steel plate cooling rate is very slow, thus simulated tempering insulating process, to the C of V, N compound is separated out and is provided time enough, the loss of strength relying on the precipitation strength of V to compensate for plate of moderate thickness 1/4 place and heart portion to cause because cooling intensity is lower, and rolling stress is discharged in insulating process, improve component security.
The present invention, by simple Composition Control, utilizes TMCP technology to obtain a kind of plate of moderate thickness of high-intensity high-tenacity, is organized as the mixed structure of acicular ferrite and granular bainite, original austenite grain and ferrite matrix grain-size tiny, evenly.Steel plate plasticity of the present invention is good, has excellent cold roll forming performance, excellent in low temperature toughness, intensity are high.The high-strength and high ductility plate of moderate thickness specific performance obtained by the present invention is: the yield strength of material is 510 ~ 600MPa, and tensile strength is 630 ~ 750MPa, and unit elongation is 20 ~ 25% ,-40 DEG C of low-temperature impact >=200J.There is stable processing technique, workable, and the feature such as low cost, high-performance.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention 3, state sample metallographic structure pattern is rolled at 56mm thick high-strength and high ductility plate of moderate thickness thickness of slab 1/4 place, is the mixed structure of acicular ferrite+granular bainite in figure.
Embodiment
Embodiment 1
The chemical composition of the high-strength and high ductility plate of moderate thickness of the present embodiment by weight percentage, C:0.08%, Si:0.28%, Mn:1.50%, P:0.0070%, S:0.0010%, Nb:0.035%, Ti:0.015%, V:0.022%, Cr:0.25%, Mo:0.08%, surplus is Fe and inevitable impurity.
Wherein, impurity content controls at N≤0.0090%, H≤0.0002, O≤0.0015%, As≤0.010%, Sn≤0.010, Sb≤0.010%, Pb≤0.010%.
During preparation, adopt low-carbon and low-sulphur phosphorus smelting technology, coordinate other alloying elements, the effective hardening capacity strengthening steel.Utilize cooling controlling and rolling controlling process and rational cooling in heap, in guarantee, C, N compound of warm ferritic transformation and V is separated out, and obtains the plate of moderate thickness of obdurability good match.Dominating process route is desulfurizing iron pre-treatment
converter smelting
lF refining
rH refining
continuous casting
strand inspection, judgement
strand is checked and accepted
heating steel billet
de-scaling
rolling
cooling
cooling in heap
flaw detection
cutting, sampling
spray printing identifies
warehouse-in.
Adopt austenite recrystallization and Unhydrated cement two-stage control rolling technique, roughing adopts the broken strand austenite crystal of the large pressure of passage, and rough rolling process temperature range is 1000 ~ 1100 DEG C, steel billet axial rolling total reduction >=60%; Finish rolling start rolling temperature is 830 ~ 870 DEG C; Roll rear controlled cooling model, stop cold temperature at 450 DEG C, red temperature 550 DEG C, opens stack after cooling in heap 60min and is as cold as room temperature.Cooling controlling and rolling controlling process detail parameters is in table 2.
Roll state steel plate stretching performance according to the present invention as shown in table 3 ,-40 DEG C of low-temperature flexibilities are as shown in table 4.Embodiment of the present invention mechanical property of steel plate is good, yield strength >=500MPa, tensile strength >=610Mpa, unit elongation >=20% ,-40 DEG C of impact of collision merit >=200J, has high strength and excellent low-temperature flexibility concurrently, stable processing technique, workable.
Produce in this intensity rank thick, save quenching-and-tempering process, cost-saving about 600 yuan of ton steel.
Embodiment 2
The chemical composition of the high-strength and high ductility plate of moderate thickness of the present embodiment by weight percentage, C:0.06%, Si:0.24%, Mn:1.60%, P:0.0065%, S:0.0010%, Nb:0.045%, Ti:0.015%, V:0.031%, Cr:0.30%, Mo:0.14%, surplus is Fe and inevitable impurity.
Wherein, impurity content controls at N≤0.0090%, H≤0.0002, O≤0.0015%, As≤0.010%, Sn≤0.010, Sb≤0.010%, Pb≤0.010%.
During preparation, adopt low-carbon and low-sulphur phosphorus smelting technology, coordinate other alloying elements, the effective hardening capacity strengthening steel.Utilize cooling controlling and rolling controlling process and rational cooling in heap, in guarantee, C, N compound of warm ferritic transformation and V is separated out, and obtains the plate of moderate thickness of obdurability good match.Dominating process route is desulfurizing iron pre-treatment
converter smelting
lF refining
rH refining
continuous casting
strand inspection, judgement
strand is checked and accepted
heating steel billet
de-scaling
rolling
cooling
cooling in heap
flaw detection
cutting, sampling
spray printing identifies
warehouse-in.
Adopt austenite recrystallization and Unhydrated cement two-stage control rolling technique, roughing adopts the broken strand austenite crystal of the large pressure of passage, and rough rolling process temperature range is 1000 ~ 1100 DEG C, steel billet axial rolling total reduction >=60%; Finish rolling start rolling temperature is 830 ~ 870 DEG C; Roll rear controlled cooling model, stop cold temperature at 403 DEG C, red temperature 558 DEG C, opens stack after cooling in heap 60min and is as cold as room temperature.Cooling controlling and rolling controlling process detail parameters is in table 2.
Roll state steel plate stretching performance according to the present invention as shown in table 3 ,-40 DEG C of low-temperature flexibilities are as shown in table 4.Embodiment of the present invention mechanical property of steel plate is good, yield strength >=500MPa, tensile strength >=610Mpa, unit elongation >=20% ,-40 DEG C of impact of collision merit >=200J, has high strength and excellent low-temperature flexibility concurrently, stable processing technique, workable.
Produce this intensity rank plate of moderate thickness, save quenching-and-tempering process, cost-saving 600 yuan of ton steel.
Embodiment 3
The chemical composition of the high-strength and high ductility plate of moderate thickness of the present embodiment by weight percentage, C:0.05%, Si:0.22%, Mn:1.70%, P:0.0060%, S:0.0010%, Nb:0.041%, Ti:0.017%, V:0.040%, Cr:0.37%, Mo:0.16%, surplus is Fe and inevitable impurity.
Wherein, impurity content controls at N≤0.0090%, H≤0.0002, O≤0.0015%, As≤0.010%, Sn≤0.010, Sb≤0.010%, Pb≤0.010%.
During preparation, adopt low-carbon and low-sulphur phosphorus smelting technology, coordinate other alloying elements, the effective hardening capacity strengthening steel.Utilize cooling controlling and rolling controlling process and rational cooling in heap, in guarantee, C, N compound of warm ferritic transformation and V is separated out, and obtains the plate of moderate thickness of obdurability good match.Dominating process route is desulfurizing iron pre-treatment
converter smelting
lF refining
rH refining
continuous casting
strand inspection, judgement
strand is checked and accepted
heating steel billet
de-scaling
rolling
cooling
cooling in heap
flaw detection
cutting, sampling
spray printing identifies
warehouse-in.
Adopt austenite recrystallization and Unhydrated cement two-stage control rolling technique, roughing adopts the broken strand austenite crystal of the large pressure of passage, and rough rolling process temperature range is 1000 ~ 1100 DEG C, steel billet axial rolling total reduction >=60%; Finish rolling start rolling temperature is 830 ~ 870 DEG C; Roll rear controlled cooling model, stop cold temperature at 380 DEG C, red temperature 550 DEG C, opens stack after cooling in heap 50min and is as cold as room temperature.Cooling controlling and rolling controlling process detail parameters is in table 2.
Roll state steel plate stretching performance according to the present invention as shown in table 3 ,-40 DEG C of low-temperature flexibilities are as shown in table 4.Embodiment of the present invention mechanical property of steel plate is good, yield strength >=500MPa, tensile strength >=610Mpa, unit elongation >=20% ,-40 DEG C of impact of collision merit >=200J, has high strength and excellent low-temperature flexibility concurrently, stable processing technique, workable.
Produce this intensity rank plate of moderate thickness, save quenching-and-tempering process, cost-saving 600 yuan of ton steel.
The main chemical compositions (wt.%) of table 1 embodiment of the present invention
| Embodiment | C | Si | Mn | P | S | Nb | Ti | V | Cr | Mo |
| Embodiment 1 | 0.08 | 0.28 | 0.15 | 0.0070 | 0.0010 | 0.035 | 0.015 | 0.022 | 0.25 | 0.08 |
| Embodiment 2 | 0.06 | 0.24 | 0.16 | 0.0065 | 0.0010 | 0.045 | 0.015 | 0.031 | 0.30 | 0.14 |
| Embodiment 3 | 0.05 | 0.22 | 0.17 | 0.0060 | 0.0010 | 0.041 | 0.017 | 0.040 | 0.37 | 0.16 |
Table 2 embodiment of the present invention controlled rolling and controlled cooling actual process parameter
| Embodiment | Specification/mm | Roughing finishing temperature/DEG C | Finish rolling start rolling temperature/DEG C | Finish rolling finishing temperature/DEG C | Stop cold temperature/DEG C | Red temperature/DEG C | Heap cool time/min |
| Embodiment 1 | 32 | 1011 | 875 | 850 | 450 | 550 | 60 |
| Embodiment 2 | 40 | 1024 | 870 | 860 | 403 | 558 | 60 |
| Embodiment 3 | 56 | 1015 | 850 | 850 | 380 | 550 | 50 |
Table 3 embodiment of the present invention steel plate stretching performance
| Embodiment | Specification/mm | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% |
| Embodiment 1 | 32 | 551 | 663 | 22 |
| Embodiment 2 | 40 | 523 | 655 | 23 |
| Embodiment 3 | 56 | 534 | 656 | 23 |
Table 4 embodiment of the present invention steel plate low-temperature impact toughness
In addition to the implementation, 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 protection scope of the present invention.
Claims (3)
1. the low-alloy high-strength plate of moderate thickness that red waste heat improves obdurability is returned in utilization, it is characterized in that: in this low-alloy high-strength plate of moderate thickness, the chemical composition of steel by weight percentage, C:0.03 ~ 0.09%, Si:0.10 ~ 0.35%, Mn:0.80 ~ 1.7%, P :≤0.015%, S :≤0.0020%, Nb:0.010 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.005 ~ 0.030%, Cr:0.15 ~ 0.50%, Mo:0.05 ~ 0.20%, surplus is Fe and inevitable impurity.
2. the low-alloy high-strength plate of moderate thickness that red waste heat improves obdurability is returned in utilization according to claim 1, it is characterized in that: this steel plate is organized as the mixed structure of acicular ferrite+granular bainite.
3. utilize described in claim 1 and return the method for making that red waste heat improves the low-alloy high-strength plate of moderate thickness of obdurability, it is characterized in that this method for making comprises following operation:
1) smelting technology: adopt converter smelting, by top blast, abundant decarburization; Adopt RH or VD Fruit storage and LF process, reduce harmful element O, N, H, S, P content, carry out microalloying, then strand, the chemical composition of steel billet meets by weight percentage, C:0.03 ~ 0.09%, Si:0.10 ~ 0.35%, Mn:0.80 ~ 1.7%, P :≤0.015%, S :≤0.0020%, Nb:0.010 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.005 ~ 0.030%, Cr:0.15 ~ 0.50%, Mo:0.05 ~ 0.20%, surplus is Fe and inevitable impurity;
2) rolling technology: adopt cooling controlling and rolling controlling process, roll front continuous blank heating temperature between 1180 DEG C ~ 1250 DEG C, adopt austenite recrystallization district and the rolling of austenite Unhydrated cement two-stage control, roughing finishing temperature 1000 ~ 1100 DEG C, roughing becomes the intermediate blank of 1.5 ~ 4.5 times of finished product thicknesses; Finish rolling start rolling temperature is 840 ~ 900 DEG C, rolls rear employing section cooling, stops cold temperature 350 ~ 450 DEG C, and red temperature is 500 ~ 650 DEG C, de-stacking air cooling after cooling in heap 30 ~ 120min.
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Application publication date: 20150225 |