CN103352167B - A kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof - Google Patents
A kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof, the chemical composition of this steel is by weight percentage, C:0.06 ~ 0.10%, Si:0.20 ~ 0.45%, Mn:1.20 ~ 1.50%, P :≤0.010%, S :≤0.0020%, Ni:0.30 ~ 0.60%, Cu:0.20 ~ 0.50%, Mo:0.15 ~ 0.50%, Nb:0.025 ~ 0.060%, Ti :≤0.035%, Alt:0.020 ~ 0.040%, all the other are Fe and inevitable impurity.The present invention is by smelting and refining, rational cooling controlling and rolling controlling process and the hot treatment production of optimization tempering, make the tensile strength of steel plate be 700 ~ 780MPa, yield strength is 530 ~ 600MPa, and unit elongation is >=18%, yield tensile ratio≤0.80,-40 DEG C of low temperature impact of collision >=100J, have good obdurability coupling and low yield tensile ratio, have excellent anti-seismic performance, stable processing technique, workable.
Description
Technical field
The present invention relates to a kind of high performance structures steel and manufacture method thereof, specifically a kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof.
Background technology
Bridges in Our Country construction to high speed, heavy duty, large span, entirely weld node, exempt from application, future development that security is high.The Bridge Steel yield strength scope of current use is generally 245 ~ 420MPa; For adapting to the requirement of bridge technology progress, integrate the high performance structures steel of the multinomial performances such as high strength, high tenacity, antidetonation, be that following Shanghai leads to, Qiongzhou Strait and Bohai Sea Gulf etc. are a collection of yet to be built greatly across the preferred material of heavy haul railway bridge key member, explicit requirement.
Abroad develop and employed high performance bridge steel kind.The U.S. adopts high performance bridge steel, has built many HPSs.This steel generally adopts quenched and tempered state to deliver goods, but impelling strength requires on the low side, and cost is high.Japan adopts high performance bridge steel, and this steel generally adopts TMCP+ tempering to deliver goods, and yield tensile ratio requires low.Some Domestic steel enterprise is developing high performance bridge steel kind, but trial product level in yield tensile ratio, low-temperature flexibility etc. still has some deficits at present.
For meet large-scale steel structure bridge to high speed, heavy duty, large span, entirely weld node, exempt from application, the development in security height direction, to over-all properties and the safe reliability proposition requirements at the higher level of Bridge Steel, the present invention discloses a kind of manufacture method of low yield strength ratio high strength bridge steel plate.
The existing patent about bridge construction steel making method, mainly obtain bridge construction steel plate by controlled rolling and controlled cooling and heat treating method, Chinese patent CN102021495 is found through retrieval, disclose the preparation method of 420MPa high tenacity Weather-resistance bridge steel and hot-rolled sheet coil thereof, its technical process is converter smelting → LF stove refining → RH vacuum-treat → casting, carbon component is designed to 0.015 ~ 0.045%, production high tenacity bridge construction steel, because Composition Design is low-carbon (LC), this steel grade low strength, yield tensile ratio is higher, can not meet the demand of high-performance bridge engineering steel.
Summary of the invention
Technical problem to be solved by this invention is, for the defect that existing highway bridge engineering steel exists, propose a kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof, the method, by reasonable component design, cooling controlling and rolling controlling process and rational thermal treatment process, obtains the low yield strength ratio high strength bridge steel plate of excellent performance.
The technical scheme that the present invention solves above technical problem is: provide a kind of low yield strength ratio high strength bridge steel plate, be by weight percentage, C:0.06 ~ 0.10%, Si:0.20 ~ 0.45%, Mn:1.20 ~ 1.50%, P :≤0.010%, S :≤0.0020%, Ni:0.30 ~ 0.60%, Cu:0.20 ~ 0.50%, Mo:0.15 ~ 0.50%, Nb:0.025 ~ 0.060%, Ti :≤0.035%, Alt:0.020 ~ 0.040%, all the other are Fe and inevitable impurity.
Chemical composition is one of key factor affecting continuously cast bloom internal soundness and High Strength Steel Plate performance, 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 one of the chief elements affecting high-strength steel mechanical property, improves the intensity of steel by gap solid solution, and when carbon content is less than 0.04, intensity is low; During too high levels, toughness and weldability will be deteriorated, and carbon content control of the present invention is 0.06 ~ 0.10%.
Si: silicon is the deoxidant element that steel-making is necessary, has certain solution strengthening effect; Silicone content is too high, is unfavorable for plate surface quality and low-temperature flexibility, and silicone content of the present invention controls 0.20 ~ 0.45%.
Mn: manganese has thinning microstructure, improves the effect of intensity and low-temperature flexibility, and with low cost.When Fe content is too high, easily cause continuous casting slab segregation.Fe content of the present invention controls 1.20 ~ 1.50%.
Ni: nickel can improve the intensity of steel, toughness and corrosion resistance nature, suppresses carbon precipitation from austenite, reduces grain boundary carbide and separates out tendency, significantly reduces intergranular carbide quantity.But along with nickel content increases, production cost can significantly increase, and nickel content of the present invention controls 0.30 ~ 0.60%.
Cu: copper can suppress polygonal ferrite and pearlitic formation, promotes cryo tissue bainite or martensitic transformation.Copper too high levels affects the toughness of steel, and causes temper brittleness, and in the present invention, copper content control is 0.20 ~ 0.50%.
Mo: the cost of alloy of molybdenum is high, can increase cost during a large amount of interpolation, and reduce toughness and weldability.Molybdenum content of the present invention controls 0.15 ~ 0.50%.
Nb: trace niobium has pinning effect to austenite grain boundary, suppresses the recrystallize of deformed austeaite, and forms precipitate when cooling or tempering, improves intensity and toughness.DeGrain when niobium addition level is less than 0.030%, when being greater than 0.055%, toughness reduces, and causes continuously cast bloom surface crack to produce, and also has deterioration effect in addition to welding property.Content of niobium of the present invention controls 0.025 ~ 0.060%.
Ti: titanium can fix the GN 2 in steel, forms titanium nitride, stops the grain growth in heating, rolling, welding process, improve the toughness of mother metal and welded heat affecting zone.Titanium Composition Control of the present invention is ≤0.035%.
Al: aluminium is a kind of important deoxidant element, adds the aluminium of trace, effectively can reduce the inclusion content in steel in molten steel, and crystal grain thinning.But too much aluminium, can promote that continuously cast bloom produces surface crack and reduces slab quality, Holo-Al content should control 0.020 ~ 0.040%.
In steel, impurity element is as S, P etc., and the low-temperature flexibility of steel and the nearly weld metal zone of welding described in meeting grievous injury, increase continuous casting slab segregation degree, therefore sulphur, phosphorus content should control below S≤0.0020% and P≤0.010%.
The technical scheme that the present invention limits further is: aforesaid low yield strength ratio high strength bridge steel plate, comprises following composition: C:0.080%, Si:0.28% by weight percentage, Mn:1.42%, P:0.0087%, S:0.0014%, Ni:0.31%, Cu:0.22%, Mo:0.25%, Nb:0.033%, Ti:0.015%, Alt:0.0032%, all the other are Fe and inevitable impurity.
Aforesaid low yield strength ratio high strength bridge steel plate, described impurity element control by weight percentage be: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%.
Aforesaid low yield strength ratio high strength bridge steel plate, the tensile strength of these steel is 700 ~ 780MPa, and yield strength is 530 ~ 600MPa, and unit elongation is >=18%, yield tensile ratio≤0.80 ,-40 DEG C of low temperature impact of collision >=100J.
A manufacture method for low yield strength ratio high strength bridge steel plate, comprise successively through smelting continuous casting process, rolling technology and thermal treatment process, described smelting continuous casting process is successively through desulfurizing iron pre-treatment, converter smelting, LF refining, RH vacuum-treat and continuous casting; It is characterized in that: in described continuous casting process, after desulfurizing iron process, sulphur content controls at S≤0.002%, converter adopts content P≤0.010% of the strict control P of double slag process, LF refining adopts white slag operation desulfating and deoxidation, and RH vacuum-treat strictly controls gas content H≤0.0001%; Continuous casting controls tundish temperature liquidus line+10 ~ 15 DEG C; Described rolling technology adopts Controlled Rolling And Controlled Cooling, continuous blank heating temperature is 1180 DEG C ~ 1200 DEG C, austenite recrystallization district and Unhydrated cement two-phase control rolling, the difference in these two stages is the rolling refined austenitic grain structure in austenite recrystallization district, carry out Unhydrated cement rolling on this basis to make to organize flattening, namely follow-up roughing and two stages of finish rolling; The broken austenite crystal of roughing passage heavy reduction, roughing finishing temperature control is at 1050 ~ 1120 DEG C; Finish rolling start rolling temperature is 850 ~ 890 DEG C; Roll rear controlled cooling model, red temperature is 580 ~ 650 DEG C, air cooling subsequently; Be heated to by steel plate between 480 ~ 630 DEG C in described thermal treatment process, carry out tempering heat treatment, tempering time controls at (2.0 ~ 3.0) min/mm × thickness of slab+30min.
The present invention is by optimizing Composition Design, and converter smelting, LF and RH refining, to reasonable set and the optimization of cooling controlling and rolling controlling process, carries out tempering heat treatment.Plate property of the present invention is good, and tensile strength is 750 ~ 800MPa, and yield strength is 530 ~ 600MPa, unit elongation is >=18%, yield tensile ratio≤0.80 ,-40 DEG C of low temperature impact of collision >=100J, there is good obdurability coupling and low yield tensile ratio, stable processing technique.
The invention has the beneficial effects as follows:
1, the present invention adopts converter smelting, continuous casting to produce bridge construction steel, adapts to numerous domestic and international steel enterprise and produces.The present invention adopts TMCP+T explained hereafter high-performance bridge steel plate, and with short production cycle, rhythm is fast, reduces production cost, improves production efficiency.
2, the present invention is designed by reasonable component, adopts low-carbon (LC), low-phosphorous sulphur smelting technology, coordinates, effectively enhance the toughness and tenacity of low alloy steel with other trace alloying elements.Adopt Controlled Rolling And Controlled Cooling, and rational tempering heat treatment, ensure that steel plate Microstructure and properties is even, obtain low yield strength ratio high strength bridge construction steel.
Accompanying drawing explanation
Fig. 1 is tissue topography of 32mm low yield strength ratio high strength bridge steel plate As rolled sample thickness 1/4 place in embodiment 3, is organized as B+F+P.
Fig. 2 is tissue topography of 32mm low yield strength ratio high strength bridge steel plate tempering state sample thickness 1/4 place in embodiment 3, is organized as a small amount of P of granular B+F+.
Embodiment
A kind of low yield strength ratio high strength bridge steel plate main chemical compositions (wt%) provided of embodiment 1-3 is as shown in table 1; The main chemical compositions (wt%) of table 1 embodiment of the present invention
Adopt austenite recrystallization district and austenite Unhydrated cement two-stage control rolling technique, roughing adopts the broken austenite crystal of passage heavy reduction, carries out roughing, finish rolling control successively, rolls rear controlled cooling model, returns red, last air cooling; The roughing finishing temperature of embodiment 1-3, finishing rolling control start rolling temperature and red temperature as shown in table 2;
Table 2 rolling process for cooling parameter list
| Embodiment | Thickness mm | Roughing finishing temperature DEG C | Finish rolling start rolling temperature DEG C | Finishing temperature DEG C | Red temperature DEG C |
| Embodiment 1 | 20 | 1057 | 860 | 842 | 641 |
| Embodiment 2 | 20 | 1064 | 856 | 840 | 638 |
| Embodiment 3 | 32 | 1068 | 867 | 845 | 626 |
Finally carry out tempering heat treatment to steel plate again, heat treatment process parameter is as shown in table 3;
Table 3 heat treatment process parameter table
Embodiment As rolled is organized as B+F+P, organizes based on bainite+ferrite after tempering heat treatment.Fig. 1 is the 32mm thick low yield strength ratio high strength bridge steel plate As rolled sample thickness 1/4 place metallograph of embodiment 3, is B+F+P tissue.Fig. 2 is the 32mm low yield strength ratio high strength bridge steel plate tempering state sample thickness 1/4 place metallograph of embodiment 3, is organized as a small amount of P of granular B+F+.
As shown in table 4 according to tempering state steel plate stretching performance of the present invention, low-temperature flexibility is as shown in table 5.The plate property result of the embodiment of the present invention is good, tensile strength is 700 ~ 780MPa, yield strength is 530 ~ 600MPa, unit elongation is >=18%, yield tensile ratio≤0.80 ,-40 DEG C of low temperature impact of collision >=100J, there is good obdurability coupling and low yield tensile ratio, anti-seismic performance is excellent, and stable processing technique is workable.
Table 4 embodiment of the present invention tempering state steel plate stretching performance
| Embodiment | Thickness/mm | Yield strength MPa | Tensile strength MPa | Unit elongation % | Yield tensile ratio % |
| Embodiment 1 | 20 | 553 | 717 | 19.9 | 77.1 |
| Embodiment 2 | 20 | 546 | 731 | 20.2 | 74.7 |
| Embodiment 3 | 32 | 540 | 707 | 19.6 | 76.4 |
Table 5 embodiment of the present invention tempering state steel plate low-temperature flexibility
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 the protection domain of application claims.
Claims (5)
1. a low yield strength ratio high strength bridge steel plate, is characterized in that: be by weight percentage, C:0.06 ~ 0.10%, Si:0.20 ~ 0.45%, Mn:1.20 ~ 1.50%, P :≤0.010%, S :≤0.0020%, Ni:0.30 ~ 0.60%, Cu:0.20 ~ 0.50%, Mo:0.15 ~ 0.50%, Nb:0.025 ~ 0.060%, Ti :≤0.035%, Alt:0.020 ~ 0.040%, all the other are Fe and inevitable impurity; The manufacture method of described low yield strength ratio high strength bridge steel plate, comprise successively through smelting continuous casting process, rolling technology and thermal treatment process, described smelting continuous casting process is successively through desulfurizing iron pre-treatment, converter smelting, LF refining, RH vacuum-treat and continuous casting; In described continuous casting process, after desulfurizing iron process, sulphur content controls at S≤0.002%, and converter adopts content P≤0.010% of the strict control P of double slag process, and LF refining adopts white slag operation desulfating and deoxidation, and RH vacuum-treat strictly controls gas content H≤0.0001%; Continuous casting controls tundish temperature liquidus line+10 ~ 15 DEG C; Described rolling technology adopts Controlled Rolling And Controlled Cooling, and continuous blank heating temperature is 1180 DEG C ~ 1200 DEG C, austenite recrystallization district and Unhydrated cement two-phase control rolling; The broken austenite crystal of roughing passage heavy reduction, roughing finishing temperature control is at 1050 ~ 1120 DEG C; Finish rolling start rolling temperature is 850 ~ 890 DEG C; Roll rear controlled cooling model, red temperature is 580 ~ 650 DEG C, air cooling subsequently; Be heated to by steel plate between 480 ~ 630 DEG C in described thermal treatment process, carry out tempering heat treatment, tempering time controls at (2.0 ~ 3.0) min/mm × thickness of slab+30min.
2. low yield strength ratio high strength bridge steel plate as claimed in claim 1, is characterized in that: comprise following composition by weight percentage: C:0.080%, Si:0.28%, Mn:1.42%, P:0.0087%, S:0.0014%, Ni:0.31%, Cu:0.22%, Mo:0.25%, Nb:0.033%, Ti:0.015%, Alt:0.0032%, all the other are Fe and inevitable impurity.
3. low yield strength ratio high strength bridge steel plate as claimed in claim 1 or 2, it is characterized in that: described impurity element control by weight percentage be: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%.
4. the low yield strength ratio high strength bridge steel plate as described in claim arbitrary in claim 1-3, it is characterized in that: tensile strength is 700 ~ 780MPa, yield strength is 530 ~ 600MPa, and unit elongation is >=18%, yield tensile ratio≤0.80 ,-40 DEG C of low temperature impact of collision >=100J.
5. the manufacture method of low yield strength ratio high strength bridge steel plate described in claim 1 or 2, comprise successively through smelting continuous casting process, rolling technology and thermal treatment process, described smelting continuous casting process is successively through desulfurizing iron pre-treatment, converter smelting, LF refining, RH vacuum-treat and continuous casting; It is characterized in that:
In described continuous casting process, after desulfurizing iron process, sulphur content controls at S≤0.002%, and converter adopts content P≤0.010% of the strict control P of double slag process, and LF refining adopts white slag operation desulfating and deoxidation, and RH vacuum-treat strictly controls gas content H≤0.0001%; Continuous casting controls tundish temperature liquidus line+10 ~ 15 DEG C;
Described rolling technology adopts Controlled Rolling And Controlled Cooling, and continuous blank heating temperature is 1180 DEG C ~ 1200 DEG C, austenite recrystallization district and Unhydrated cement two-phase control rolling; The broken austenite crystal of roughing passage heavy reduction, roughing finishing temperature control is at 1050 ~ 1120 DEG C; Finish rolling start rolling temperature is 850 ~ 890 DEG C; Roll rear controlled cooling model, red temperature is 580 ~ 650 DEG C, air cooling subsequently;
Be heated to by steel plate between 480 ~ 630 DEG C in described thermal treatment process, carry out tempering heat treatment, tempering time controls at (2.0 ~ 3.0) min/mm × thickness of slab+30min.
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