CN101928880B - High-strength high-toughness steel for electric power communication rod and processing method thereof - Google Patents
High-strength high-toughness steel for electric power communication rod and processing method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength high-toughness steel for an electric power communication rod and a processing method thereof, wherein the steel comprises the following components in percentage by weight: 0.05-0.09%, Si: less than or equal to 0.03 percent, Mn: 1.15-1.35%, P: less than or equal to 0.025 percent, S: less than or equal to 0.015 percent, Nb: 0.040 to 0.060%, Ti: 0.010-0.025%, V: 0.045-0.065%, and the balance of Fe and inevitable impurities. The material not only has higher strength and toughness, but also has excellent weldability and surface coating property.
Description
Technical field
The present invention relates to electric power and communication bar use steel, relating in particular to a kind of ys is 520MPa grade low-temp high-tenacity steel for power communication poles and working method thereof, belongs to low-alloy high-tensile structural steel manufacturing technology field.
Background technology
The continuous quickening of building along with urbanization and to the requirement of urban beautification, also increasingly high to the requirement of urban electric power bar and communication bar, require its product that adopts the thin specification of HS to replace the product of the thick specification of traditional low strength.Electric power and communication bar are generally 345MPa, 390MPa with the ys rank of steel at present, and minority is the 420MPa rank.
Application number is that 200810197267.9 one Chinese patent application discloses a kind of high-intensity high-tenacity-50 ℃ low-temperature steel and method of manufacture thereof, and percentage composition is: C:0.12～0.20, Si:0.15～0.50; Mn:1.20～1.70, P :≤0.015, S :≤0.010; Ni:0.30～1.00, Ti:0.005～0.050, Al:0.005～0.10; Nb:0.010～0.050, contain V in addition :≤0.10, Cu :≤1.0; Mo :≤0.50, Zr :≤0.040, RE: one or more in≤0.020.Wherein C content is high, so the cold crack index is higher.
Application number is that 200710113911.5 one Chinese patent application discloses a kind of steel for high-strength weather-proof low-alloy electric force bar and preparation method thereof; The composition weight percent is: C:0.06～0.12%, Si:0.15～0.35%, Mn:1.0～1.40%, S≤0.030%, P≤0.030%, Cu:0.15～0.30%, Al＜0.04%, Nb:0.01～0.03%; Utilize existing installation and common process production, through combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, through the adjustment member constituent content, carry out microalloying and handle, the controlled rolling processing condition are produced economical and weather resistant steel.Its Si content is unfavorable for improving formability, weldableness, toughness and the plasticity of steel 0.15～0.35%, and YIELD STRENGTH is below 480MPa, and the comprehensive mechanical property of material remains to be improved.
Application number is that 200510045624.6 one Chinese patent application discloses a kind of economy type weathering-resistant steel; Composition is: C:0.12～0.21%, Si:0.2～2.0%, Mn:0.7～2.0%, S≤0.036%, P≤0.034%, Cu:0.10～0.40%, Al＜0.2%, all the other are Fe and trace impurity.Through alloyings such as Cu, Mn, Si, Al, and simply adjust the part constituent content of ordinary low-carbon steel (Q235 steel), need not change under the Q235 steel manufacturing condition, produce the economical and weather resistant steel of atmospheric corrosion resistance.Its C content is higher, and welding property is not good, and YIELD STRENGTH only reaches the 345MPa rank, and-20 ℃ of V-type ballistic works have only 27J.
Current, along with electric power and communication bar develop towards the maximization direction, need to carry bigger load, for this reason, the weight of electric power and communication bar also constantly increases.In the case,, not only can reduce the weight of electric power and communication bar master material, also can reduce the specification of cross-arm material if use more high-intensity steel.Therefore, produce more high-intensity steel for power communication poles, significant.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; It is other high-intensity high-tenacity steel for power communication poles and working method thereof of 520MPa level that a kind of ys is provided, and this material should have HS, H.T., good welds property, good over-all propertieies such as surperficial coating.
The object of the invention is realized through following technical scheme:
The high-intensity high-tenacity steel for power communication poles, characteristics are: the quality percentage composition of its composition is following---
C 0.05～0.09％，
Si ≤0.03％，
Mn 1.15～1.35％，
P ≤0.025％，
S ≤0.015％，
Nb 0.040～0.060％，
Ti 0.010～0.025％，
V 0.045～0.065％，
All the other components are Fe and unavoidable impurities.
Further, above-mentioned high-intensity high-tenacity steel for power communication poles, wherein, the ys of said steel is more than 520MPa, tensile strength is more than 600MPa, elongation after fracture is more than 27%, steel plate laterally-20 ℃ of Charpy-V impact powers more than 130J.
Further, above-mentioned high-intensity high-tenacity steel for power communication poles, its composition have following preferred mass per-cent: C 0.06%; Si 0.03%, and Mn 1.23%, P0.016%; S 0.006%, and Nb 0.048%, and Ti 0.021%; V 0.057%, and all the other components are Fe and unavoidable impurities.
The process steps of high-intensity high-tenacity steel for power communication poles of the present invention is: the slab that melting and casting is obtained is heated to 1190 ℃～1230 ℃, carries out roughing then, and the roughing end temp is controlled at 1000 ℃～1100 ℃; Then carry out finish rolling, the finish rolling start rolling temperature is controlled at 900 ℃～950 ℃, and the finish rolling end temp is controlled at 820 ℃～880 ℃; After finish rolling finishes, carry out the laminar flow cooling, batch at last, obtain coiled sheet.
Further, in the working method of above-mentioned high-intensity high-tenacity steel for power communication poles, said roughing is 5 passage tandem rollings, and said finish rolling is 7 passage tandem rollings.
Again further, in the working method of above-mentioned high-intensity high-tenacity steel for power communication poles, said finish rolling stage compression ratio is greater than 80%.After the finish rolling, the thickness of sheet material is at 3～12mm.Said temperature of batching is controlled at 500 ℃～600 ℃.
Substantive distinguishing features and obvious improvement that technical scheme of the present invention is outstanding are mainly reflected in:
1. through reducing C, Si content, microalloy elements such as compound interpolation strengthening element Nb, V, Ti adopt working methods such as low temperature finish to gauge, quick cooling to make; The ys index of coiled sheet reaches more than the 520MPa, has good comprehensive mechanical property, and the ys index reaches more than the 520MPa; Intensity than existing steel for power communication poles improves a lot; Increase anti-loading capacity, be fit to the design of steel plate attenuate, thereby reduced the production cost of power communication poles; And this material also has good low-temperature impact toughness, the use down of suitable various environment.
2. has good surperficial coating performance; Handle through zinc-plated flower, make electric power bar, communication bar and lamp stand have beautiful appearance, improved the resistance to corrosion of material greatly; Prolonged the work-ing life of electric power and communication bar, having avoided in the past, power communication poles has an accident because of corrosion.
3. have good welding property, recommend, can effectively improve welding efficiency, obtain excellent property of welded joint through reasonable component design and welding material.
4. adopt cooling controlling and rolling controlling process production, with hot-rolled state delivery, need not to heat-treat, ME is simple, and production cost is lower, and this material is applicable to that power communication poles, vehicle, bridge etc. are exposed to the steelwork that uses in the atmosphere for a long time.
Description of drawings
Fig. 1: the metallographic microstructure photo of steel for power communication poles of the present invention.
Embodiment
The present invention provide a kind of ys be other high-intensity high-tenacity electric power of 520MPa level and communication bar with steel and method of manufacture thereof; Adopt low-carbon (LC), low silicon and microalloying treatment technology; Utilize inclusion morphology control techniques and controlled rolling controlled cooling technology to produce; Thereby when guaranteeing that material has higher-strength, have excellent comprehensive performances such as H.T., good welds performance, good surperficial coating, high performance-price ratio.Solved existing electric power and the communication bar is on the low side with hardness of steel and toughness, and technological deficiency such as intensity and plasticity can not matched well, and surperficial coating is relatively poor.
The high-intensity high-tenacity steel for power communication poles, in this alloy: C 0.05～0.09%, Si≤0.03%; Mn 1.15～1.35%, P≤0.025%, S≤0.015%; Nb0.040～0.060%; Ti 0.010～0.025%, and V 0.045～0.065%, and all the other components of this alloy are Fe and unavoidable impurities.And the ideal composition proportion is: C 0.06%, and Si 0.03%, and Mn 1.23%, and P 0.016%, and S 0.006%, and Nb 0.048%, and Ti 0.021%, and V 0.057%, and all the other components are Fe and unavoidable impurities.Ys >=the 520MPa of steel wherein, tensile strength >=600MPa, elongation after fracture >=27%, steel plate is-20 ℃ of Charpy-V impact power >=130J laterally.
The effect of each element is following in the steel:
[carbon]: improve carbon content, favourable to the room temperature strength and the medium temperature intensity that improve steel, but all unfavorable to plasticity, toughness, formability, the weldability of steel, so preferred 0.05～0.09% C.
[silicon]: reduce silicone content, not only improved formability, weldableness, toughness and the plasticity of steel, also significantly improved the surperficial coating of steel, so control Si≤0.03%.
[manganese]: improve manganese content in the steel, can enlarge the γ district, reduce γ → α transition temperature; Enlarge rolling scope, the chance of growing up of ferrite crystal grain is significantly reduced, thereby promote grain refining; Increase the obdurability of steel, but manganese content is high, the cost of the corresponding increase steel of meeting; Also can increase carbon equivalent, be unfavorable for welding, so Mn content is controlled at 1.15～1.35%.
[sulphur]: sulphur forms sulfide inclusion in steel, reduces ductility and toughness; During steel rolling, because MnS is mingled with along with rolling direction is extended, the anisotropy of steel is increased the weight of, cause the steel plate layering when serious, the high steel resistance to corrosion of sulphur content greatly reduces simultaneously, and is also unfavorable to the welding of steel, so control S≤0.015%.
[phosphorus]: the high cold shortness that increases steel of phosphorus, the brittle transition temperature of steel is risen, the impelling strength of steel is significantly descended, control P≤0.025%.
[titanium]: add trace amount of titanium in the steel, not only help the deoxidation of steel, and, can play recrystallize that postpones austenite crystal and the tendency of growing up, thereby improve the performance of steel, especially improve impelling strength owing to the nitride of titanium in the steel or the existence of carbide.Ti can also effectively improve welding property, and crystal grain was too grown up when TiN can effectively prevent the slab heating.So Ti of preferred 0.010～0.025%.
[niobium]: niobium forms nitride or carbide in steel, help the crystal grain thinning tissue, the effect of performance precipitation strength, and Nb content is controlled at 0.040～0.060%.
[vanadium]: in steel, form carbide, the effect of performance precipitation strength, the obdurability of raising steel; In addition, the compound adding of niobium, vanadium, titanium, more remarkable than adding effect separately separately, improved the intensity and the toughness of steel greatly.
The founding of high-intensity high-tenacity steel for power communication poles is: adopt molten iron pre-desulfurization; The converter top bottom blowing; Blow Ar station (or LF stove) and guarantee bottom blowing Ar churning time greater than 5 minutes, the RH stove carries out trimming, vacuum circulation degassing is handled, and continuous casting adopts low-carbon steel protecting slag; Whole process is blown Ar protection casting, obtains continuous casting steel billet.
What need stress is; The working method of high-intensity high-tenacity steel for power communication poles of the present invention is: the slab that melting and casting is obtained is heated to 1190 ℃～1230 ℃; Carry out roughing then, roughing is 5 passage tandem rollings, and the roughing end temp is controlled at 1000 ℃～1100 ℃; Then carry out finish rolling, finish rolling is 7 passage tandem rollings, and the finish rolling start rolling temperature is controlled at 900 ℃～950 ℃, and the finish rolling end temp is controlled at 820 ℃～880 ℃, and finish rolling stage compression ratio is greater than 80%; After the finish rolling, the thickness of sheet material is at 3～12mm; Then carry out the laminar flow cooling, batch at last, the temperature of batching is controlled at 500 ℃～600 ℃, obtains coiled sheet.
The present invention adopts low-carbon (LC), low silicon; With manganese as strengthening element; Carry out deoxidation with aluminium, and adopt niobium, vanadium, titanium micro-alloyed reinforcement, utilize inclusion morphology control techniques and controlled rolling controlled cooling technology to produce; Under certain working method, obtain to have HS, the steel for power communication poles of good low-temperature impact toughness and good weldableness, formability, clod wash property.Practical application of the present invention and advantage thereof will be embodied by following Example.
Embodiment:
The steel № I～v of composition as shown in table 1 (%).Adopt molten iron pre-desulfurization, the converter top bottom blowing blows Ar station (or LF stove) and guarantees that bottom blowing Ar churning time was greater than 5 minutes; The RH stove carries out trimming, vacuum circulation degassing is handled; Guarantee the pure degassing time of RH greater than 8 minutes, feed an amount of iron-calcium line simultaneously, continuous casting adopts low-carbon steel protecting slag; Whole process is blown Ar protection casting, is cast into the thick continuous casting steel billet of 210mm.Continuous casting steel billet is after the process furnace heating, and rolling on the Continuous Heat tandem rolling mill, process control parameter is seen table 2; After recrystallization zone and the controlled rolling of non-recrystallization district, carry out controlled chilling through roughing milling train and finish rolling tandem rolling unit, batch then; Obtain hot-rolled sheet coil, thickness is at 3～12mm.
Table 1 composition
Table 2 hot rolling technology controlled variable
| Slab heating temperature/℃ | The roughing end temp/℃ | Finish rolling begin temperature/℃ | The finish rolling end temp/℃ | Finish rolling compression ratio/% | Coiling temperature/℃ | |
| Embodiment 1 | 1230 | 1060 | 930 | 880 | 84 | 580 |
| Embodiment 2 | 1210 | 1050 | 950 | 870 | 82 | 560 |
| Embodiment 3 | 1200 | 1020 | 910 | 820 | 80 | 530 |
| Embodiment 4 | 1190 | 1100 | 900 | 850 | 89 | 600 |
| Embodiment 5 | 1220 | 1000 | 920 | 840 | 87 | 500 |
The power communication poles that the foregoing description obtains is used hot-rolled steel sheet, and microstructure is that ferritic adds a spot of perlite, and grain fineness number is more than 12 grades, metallographic microstructure such as Fig. 1 of embodiment 1 steel.Except that having HS, also have good low-temperature impact toughness and good welding, moulding, processing characteristics.Ys >=520MPa, tensile strength >=600MPa, elongation after fracture >=27%, steel plate is-20 ℃ of Charpy-V impact power >=130J laterally.Sampling detects mechanical property and sees the following form 3.In addition, also have good surperficial coating performance, after zinc-plated processing, the weather resistance of material is very desirable.
Table 3 mechanical property
| Ys/MPa | Tensile strength/MP% | Elongation after fracture/% | -20℃ Akv/J | 180 pliability test d=2a | |
| Embodiment 1 | 535 | 610 | 33 | 165 | Intact |
| Embodiment 2 | 550 | 615 | 31 | 150 | Intact |
| Embodiment 3 | 560 | 635 | 29 | 135 | Intact |
| Embodiment 4 | 595 | 655 | 30 | / | Intact |
| Embodiment 5 | 570 | 630 | 28 | / | Intact |
To sum up visible, the present invention is through reducing C, Si content, microalloy elements such as compound interpolation strengthening element Nb, V, Ti; Adopt low temperature finish to gauge; Working methods such as quick cooling are produced, and the ys index of coiled sheet is reached more than the 520MPa, show following characteristics especially:
1) material of the present invention has good comprehensive mechanical property; The ys index reaches more than the 520MPa, and is more a lot of than the intensity raising of existing steel for power communication poles, increased anti-loading capacity; Be fit to the design of steel plate attenuate, thereby reduce the production cost of power communication poles; And this material also has good low-temperature impact toughness, is fit to use under the various envrionment conditionss.
2) material of the present invention has good surperficial coating performance; Handle through zinc-plated flower; Make electric power bar, communication bar and lamp stand have beautiful appearance; Improved the resistance to corrosion of material greatly, prolonged the work-ing life of electric power and communication bar, having avoided in the past, power communication poles has an accident because of corrosion.
3) material of the present invention has good welding property, recommends through reasonable component design and welding material, effectively improves welding efficiency, obtains excellent property of welded joint.
4) material of the present invention adopts cooling controlling and rolling controlling process production, with hot-rolled state delivery, need not to heat-treat; ME is simple, and production cost is lower, uses this material can reduce the weight of power communication poles master material; Also can reduce the specification of cross-arm material, produce electric power bar, communication bar and the lamp stand of 12 meters～60 meters of height, the impact that can resist many typhoons; Produced good economic benefit and social effect, application should be widely promoted.
What need understand is: above-mentioned explanation is not to be limitation of the present invention, and in concept of the present invention, the interpolation of being carried out, conversion, replacement etc. also should belong to protection scope of the present invention.
Claims (8)
1. high-intensity high-tenacity steel for power communication poles, it is characterized in that: the quality percentage composition of its composition is following---
C 0.05～0.09％，
Si ≤0.03％，
Mn 1.15～1.35％，
P ≤0.025％，
S ≤0.015％，
Nb 0.040～0.060％，
Ti 0.010～0.025％，
V 0.045～0.065％，
All the other components of this alloy are Fe and unavoidable impurities; The ys of said steel is more than 520MPa, and tensile strength is more than 600MPa, and elongation after fracture is more than 27%, and horizontal-20 ℃ of Charpy-V impact powers of steel plate are more than 130J.
2. high-intensity high-tenacity steel for power communication poles according to claim 1 is characterized in that its composition has following mass percent: C 0.06%, and Si 0.03%; Mn1.23%, P 0.016%, and S 0.006%; Nb 0.048%; Ti 0.021%, V0.057%, and all the other components are Fe and unavoidable impurities.
3. the working method of the described high-intensity high-tenacity steel for power communication poles of claim 1, it is characterized in that: the slab that melting and casting is obtained is heated to 1190 ℃～1230 ℃, carries out roughing then, and the roughing end temp is controlled at 1000 ℃～1100 ℃; Then carry out finish rolling, the finish rolling start rolling temperature is controlled at 900 ℃～950 ℃, and the finish rolling end temp is controlled at 820 ℃～880 ℃; After finish rolling finishes, carry out the laminar flow cooling, batch at last, obtain coiled sheet.
4. the working method of high-intensity high-tenacity steel for power communication poles according to claim 3 is characterized in that: said roughing is 5 passage tandem rollings.
5. the working method of high-intensity high-tenacity steel for power communication poles according to claim 3 is characterized in that: said finish rolling is 7 passage tandem rollings.
6. according to the working method of claim 3 or 5 described high-intensity high-tenacity steel for power communication poles, it is characterized in that: said finish rolling stage compression ratio is greater than 80%.
7. the working method of high-intensity high-tenacity steel for power communication poles according to claim 3 is characterized in that: the thickness of sheet material is at 3～12mm after the finish rolling.
8. the working method of high-intensity high-tenacity steel for power communication poles according to claim 3 is characterized in that: said temperature of batching is controlled at 500 ℃～600 ℃.
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| CN102758135A (en) * | 2011-04-27 | 2012-10-31 | 上海梅山钢铁股份有限公司 | High-strength structural steel suitable for alpine regions and production method of high-strength structural steel |
| CN103695804A (en) * | 2012-09-28 | 2014-04-02 | 上海梅山钢铁股份有限公司 | Steel used for petroleum vessel support and production method of the steel |
| CN102925798B (en) * | 2012-10-26 | 2014-07-02 | 武汉钢铁(集团)公司 | Steel with yield strength of 450MPa for railway wagon parts and production method |
| CN103602891B (en) * | 2013-10-22 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | The production method of the ductility steel plate of yield strength 460MPa level |
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| CN1806062A (en) * | 2003-06-12 | 2006-07-19 | 杰富意钢铁株式会社 | Steel plate and welded steel tube exhibiting low yield ratio, high strength and high toughness and method for producing thereof |
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