CN101161849A - Method for improving performance of 700MPa grade V-N micro-alloying high-strength weathering steel - Google Patents
Method for improving performance of 700MPa grade V-N micro-alloying high-strength weathering steel Download PDFInfo
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Abstract
The invention discloses a method for improving the performance of 700 MPa grade V-N microalloyed high strength weathering steel. The method is specific to the characteristics of the sheet billet continuous casting and tandem rolling technology and metallurgy component, and adopts an electric furnace or a revolving furnace to smelt, refine, continuously cast sheet billet which directly enters into a roller hearth to heat after a casting blank concretes, or soaking furnace, hot rolling, laminar flow cooling and wind-up process flow. The chemical composition of molten steel is :C occupies less than or equal to 0.08Wt. percent, Si occupies from 0.25 to 0.75Wt. percent, Mn occupies from 0.2 to 2.0Wt.percent, P occupies less than or equal to 0.025Wt. percent, S occupies less than or equal to 0.040Wt. percent, Cu occupies from 0.25 to 0.60Wt. percent, Cr occupies from 0.30 to 1.25 Wt.percent, Ni occupies less than or equal to 0.65Wt. percent, V occupies from 0.02 to 0.20Wt. percent and N occupies from 0.015 to 0.030 Wt. percent. The invention takes full advantages of the characteristics of the sheet billet continuous casting and tandem rolling short flow process and adopts the V-N microalloyed technique to produce 700 MPa grade high strength weathering steel under the thinning function of VN and V (C, N) nanometer scale precipitate on crystal grain in casting blank of the sheet billet continuous casting and tandem rolling flow and the theory of precipitation strength. By the optimization design of the metallurgy component of V-N microalloyed 700MPa grade high strength weathering steel, the invention increases the low temperature impact ductility of coil of strip and improves the shaping property.
Description
Technical field
The invention belongs to the low alloy steel production technical field, particularly adopt continuous casting and rolling technique of sheet bar production yield strength 〉=700MPa, have the method for the high-strength weathering steel of fine grain structure, good performances such as toughness, welding and shaping.
Background technology
700MPa grade high-strength weathering steel mainly is used in the manufacturing of special container, special vehicle and high-speed train railway carriage, is playing an important role aspect loss of weight, speed-raising, increase volume of freight traffic, prolongation service life of equipment and the reduction logistics cost.Japan, European many industrially developed country go out the superstrength weathering steel that yield strength surpasses 700MPa by Nb, V, Ti, the technological development of Mo combined microalloying as countries such as Germany, Sweden, and are widely used in the manufacturing of special container, special vehicle and high-speed train railway carriage on traditional process at present.The yield strength of the high-strength weathering steel of enterprise's employing Development and Production of traditional hot tandem rolling flow processs such as domestic Baosteel, Anshan iron and steel plant, Wuhan Iron and Steel Plant is in 450MPa～550MPa level, and the strong weathering steel of Yield strength 700 MPa superelevation is also in triturating.200610123458.1), produce the method (number of patent application: 200610035800.2) of Yield strength 700 MPa grade V-N microalloyed high-strength air corrosion-resistant steel based on continuous casting and rolling technique of sheet bar Zhujiang River iron and steel limited liability company (hereinafter to be referred as the pearl steel) has developed based on bar strip continuous casting and rolling flow path and has adopted Ti microalloying technology to produce the method for Yield strength 700 MPa grade high-strength weathering steel (number of patent application:.
(number of patent application: 200610035800.2), the molten steel chemical ingredients scope that this patent of invention is asked for protection is C :≤0.08Wt.% to the method for the high-strength weathering steel plate of pearl steel employing V-N micro-alloying technology production Yield strength 700 MPa grade; Si:0.25～0.75Wt.%; Mn:0.8～2.0Wt.%; P:0.070～0.150Wt.%; S :≤0.040Wt.%; Cu:0.25～0.60Wt.%; Cr:0.30～1.25Wt.%; Ni :≤0.65Wt.%; V:0.05～0.20Wt.%; N:0.015～0.030Wt.%.But the high-strength weathering steel plate portion coil of strip that in actual application, find to adopt the V-N micro-alloying technology to produce Yield strength 700 MPa grade exist low-temperature impact toughness on the low side, seminess appears easily at punching course, influenced quality product.Therefore need on metallurgically design and technology controlling and process, take new design and processes route adjustment, produce the better Yield strength 700 MPa grade high-strength weathering of over-all properties steel plate, to meet the need of market.
Summary of the invention
The object of the present invention is to provide a kind of method of the 700MPa of raising Mpa V-N microalloyed high-strength weathering steel performance, this method redesigns and the operational path adjustment the technology of producing V-N microalloying 700MPa grade high-strength weathering steel plate based on continuous casting and rolling technique of sheet bar, by high-strength weathering steel low-temperature impact toughness and forming property being influenced the optimization of significant phosphoric composition, thereby produce the better high-strength weathering steel plate of over-all properties, to meet the need of market.
Purpose of the present invention is achieved by taking following technical scheme:
A kind of method that improves 700MPa Mpa V-N microalloyed high-strength weathering steel performance, it is characterized in that characteristics and metallurgically at continuous casting and rolling technique of sheet bar, adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller bottom type heating or soaking pit behind the casting blank solidification, hot rolling, laminar flow cooling and coiling technique flow process, wherein molten steel chemical ingredients scope is: C :≤0.08Wt.%, Si:0.25～0.75Wt.%, Mn:0.8～2.0Wt.%, P :≤0.025Wt.%, S :≤0.040Wt.%, Cu:0.25～0.60Wt.%, Cr:0.30～1.25Wt.%, Ni :≤0.65Wt.%, V:0.05～0.20Wt.%, N:0.015～0.030Wt.%; The continuous casting and rolling technique of sheet bar parameter is: 900～1100 ℃ of strand charging temperatures, 1030～1200 ℃ of soaking temperatures, 950～1120 ℃ of start rolling temperatures, 830～920 ℃ of finishing temperatures, 550～650 ℃ of coiling temperatures.
As a further improvement on the present invention, metallurgically optimization design at 700MPa Mpa V-N microalloyed high-strength weathering steel, phosphorus content is improved the low-temperature impact toughness of steel more to P≤0.015% in the attenuating steel, slows down the influence of phosphorus to the low-temperature impact toughness of steel.
The present invention gives full play to the characteristics of CSP abbreviated system, utilize the V-N micro-alloying technology, (C, N) the nano-scale precipitate is produced 700MPa grade high-strength weather-resistant steel plate to the refining effect of crystal grain and the principle of precipitation strength for VN, V in the strand of bar strip continuous casting and rolling flow path.The present invention improves low-temperature impact toughness increase, the forming property of coil of strip by the metallurgically optimization design to V-N microalloying 700MPa grade high-strength weathering steel plate.
Phosphorus is to improve the effective elements of atmospheric corrosion resistance in the alloying element, and with other alloying elements, particularly copper and chromium or be used with copper, chromium etc. simultaneously are to improve the atmospheric corrosion resistance of steel.But the phosphorous toughness that can worsen steel in the steel, the low-temperature impact toughness of particularly violent reduction steel.700MPa grade high-strength weathering steel plate requires very strict to the low-temperature impact toughness of steel, the present invention passes through crystal grain thinning, the ferrite grain size scope is 2.5～7.0 microns, lower phosphorus content P≤0.025% in the steel simultaneously, can improve the low-temperature impact toughness of steel, slow down the influence of phosphorus, improve the forming property of steel the low-temperature impact toughness of steel.
The invention has the advantages that, can stably obtain high strength, high formability energy, high-weatherability and the good welding property of steel plate, the metallurgically of steel is simpler, the alloying production cost is lower, is to be used to the desirable sheet material that the industrial plants of producing freight container, railcar and needing the weather-resistant and high-strength degree are built.
Embodiment
The embodiment of the invention adopts bar strip continuous casting and rolling flow path, (embodiment 1 to utilize the V-N micro-alloying technology to carry out the production of Yield strength 700 MPa weathering steel, 2), and the reasonable control by alloying constituent, the low-temperature impact toughness of coil of strip is increased, the drawing performance significantly improves (implementation result).
Embodiment 1
Molten steel chemical ingredients: 0.04%C-0.45%Si-1.6%Mn-0.015%P-0.005%S-0.28%Cu-0.18%Ni-0. 55%Cr-0.145%V-0.026%N.
Technology: strand charging temperature: 950～1000 ℃; Soaking temperature: 1140～1160 ℃; 1050～1100 ℃ of start rolling temperatures; Finishing temperature: 860～880 ℃; Coiling temperature: 580～620 ℃.
The grain fineness number and the mechanical property of steel band see Table 1.
The grain-size and the mechanical property of table 1 embodiment 1 steel band
| Thickness of strips mm | Grain-size μ m | Rel MPa | Rm Mpa | A ％ | Wide clod wash b=35mm, 180 ° of d=1.5a |
| 1.8 | 3.8 | 745 | 830 | 21 | Intact |
| 2.5 | 3.9 | 730 | 815 | 23 | Intact |
| 3.2 | 3.5 | 745 | 820 | 21 | Intact |
| 4.0 | 4.1 | 725 | 795 | 25 | Intact |
| 6.0 | 3.8 | 720 | 805 | 24 | Intact |
| 8.0 | 4.1 | 735 | 815 | 25 | Intact |
(number of patent application: 200610035800.2) the coil of strip performance of Sheng Chaning compares for Yield strength 700 MPa weathering steel that embodiment 1 produces and former invention.The contrast of low-temperature impact toughness index is as shown in table 2, and the steel plate ductile-brittle transition temperature reduces, and normal temperature to-40 ℃ of ballistic works significantly improve.
Table 2 embodiment 1 and former invention (number of patent application: 200610035800.2) steel band impelling strength contrast
| Test temperature ℃ | Summer is than impact absorbing energy A kV, J, specimen size: 5 * 10 * 55mm | |||||||
| Former invention (number of patent application: 200610035800.2) | Embodiment 1 | |||||||
| Sample 1 | Sample 2 | Sample 3 | On average | Sample 1 | Sample 2 | Sample 3 | On average | |
| 20 | 44 | 48 | 41 | 45 | 80 | 73 | 68 | 70 |
| 0 | 44 | 38 | 39 | 40 | 58 | 75 | 62 | 65 |
| -20 | 32 | 38 | 34 | 35 | 58 | 55 | 68 | 60 |
| -40 | 20 | 8 | 17 | 15 | 45 | 57 | 49 | 50 |
| -60 | 12 | 10 | 9 | 10 | 24 | 22 | 15 | 20 |
| -80 | 5 | 9 | 10 | 8 | 8 | 7 | 15 | 10 |
The embodiment of the invention 1 forms the contrast of part qualification rate with former invention steel plate cold bending crackle qualification rate and punching press, and is as shown in table 3.Steel plate cold bending crackle qualification rate and punching press form the part qualification rate and significantly improve, and have satisfied the demand in production and market.
Table 3 embodiment 1 and former invention (number of patent application: 200610035800.2)
Cold Bending Crack qualification rate and punching press form the contrast of part qualification rate
| Thickness specification mm | Former invention (the number of applying for a patent: 200610035800.2) | Embodiment 1 | ||
| Cold Bending Crack statistics qualification rate | Punching press forms part and closes statistics lattice rate | The Cold Bending Crack qualification rate | Punching press forms the part qualification rate | |
| 1.6～3.0 | 90 | 90 | 100 | 100 |
| 3.0～5.0 | 85 | 88 | 99 | 99 |
| 5.0～-8.0 | 80 | 85 | 98.5 | 98 |
Embodiment 2
Molten steel chemical ingredients: 0.062%C-0.4%Si-1.4%Mn-0.025%P-0.008%S-0.29%Cu-0.23%Ni-0. 67%Cr-0.12%V-0.020%N.
Technology: strand charging temperature: 920～960 ℃; Soaking temperature: 1100～1150 ℃; 1000～1080 ℃ of start rolling temperatures; Finishing temperature: 830～860 ℃; Coiling temperature: 580～620 ℃.
The grain fineness number and the mechanical property of steel band see Table 4.
The grain-size and the mechanical property of table 4 embodiment 2 steel bands
| Thickness of strips mm | Grain-size μ m | Rel MPa | Rm MPa | A ％ | Wide clod wash b=35mm, 180 ° of d=1.5a |
| 1.6 | 3.6 | 750 | 845 | 22 | Intact |
| 2.0 | 3.5 | 735 | 810 | 23 | Intact |
| 3.0 | 3.4 | 725 | 825 | 24 | Intact |
| 3.5 | 4.0 | 725 | 805 | 22 | Intact |
| 5.0 | 4.2 | 725 | 815 | 21 | Intact |
| 6.0 | 4.0 | 730 | 810 | 25 | Intact |
| 8.0 | 4.3 | 720 | 815 | 22 | Intact |
(number of patent application: 200610035800.2) the coil of strip performance of Sheng Chaning compares for Yield strength 700 MPa weathering steel that embodiment 2 produces and former invention.The contrast of low-temperature impact toughness index is as shown in table 5, and the steel plate ductile-brittle transition temperature reduces, and normal temperature to-40 ℃ of ballistic works significantly improve.
Table 5 embodiment 2 and former invention (number of patent application: 2006100358002) steel band impelling strength contrast
| Test temperature ℃ | Summer is than impact absorbing energy A kV, J, specimen size: 5 * 10 * 55 mm | |||||||
| Former invention (number of patent application: 200610035800.2) | Embodiment 2 | |||||||
| Sample 1 | Sample 2 | Sample 3 | On average | Sample 1 | Sample 2 | Sample 3 | On average | |
| 20 | 44 | 48 | 41 | 45 | 78 | 77 | 70 | 75 |
| 0 | 44 | 38 | 39 | 40 | 68 | 73 | 62 | 68 |
| -20 | 32 | 38 | 34 | 35 | 63 | 55 | 65 | 61 |
| -40 | 20 | 8 | 17 | 15 | 52 | 57 | 48 | 52 |
| -60 | 12 | 10 | 9 | 10 | 24 | 22 | 20 | 22 |
| -80 | 5 | 9 | 10 | 8 | 8 | 7 | 12 | 9 |
The embodiment of the invention 2 forms the contrast of part qualification rate with former invention steel plate cold bending crackle qualification rate and punching press, and is as shown in table 6.Steel plate cold bending crackle qualification rate and punching press form the part qualification rate and significantly improve, and have satisfied the demand in production and market.
Table 6 embodiment 2 and former invention (number of patent application: 200610035800.2)
Cold Bending Crack qualification rate and punching press form the contrast of part qualification rate
| Thickness specification mm | Former invention (number of patent application: 200610035800.2) | Embodiment 2 | ||
| Cold Bending Crack statistics qualification rate | Punching press forms part and closes statistics lattice rate | The Cold Bending Crack qualification rate | Punching press forms the part qualification rate | |
| 1.6～3.0 | 90 | 90 | 100 | 100 |
| 3.0～5.0 | 85 | 88 | 98.5 | 99.5 |
| 5.0～-8.0 | 80 | 85 | 98 | 98.5 |
The specific embodiment of more than enumerating is used for that the present invention will be described.Embodiment only is used for that the invention will be further described, does not represent protection scope of the present invention, and nonessential modification and adjustment that other people make according to the present invention still belong to protection scope of the present invention.
Claims (2)
1. method that improves 700MPa Mpa V-N microalloyed high-strength weathering steel performance, it is characterized in that characteristics and metallurgically at continuous casting and rolling technique of sheet bar, adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller bottom type heating or soaking pit behind the casting blank solidification, hot rolling, laminar flow cooling and coiling technique flow process, wherein molten steel chemical ingredients scope is: C :≤0.08Wt.%, Si:0.25～0.75Wt.%, Mn:0.8～2.0Wt.%, P :≤0.025Wt.%, S :≤0.040Wt.%, Cu:0.25～0.60Wt.%, Cr:0.30～1.25Wt.%, Ni :≤0.65Wt.%, V:0.05～0.20Wt.%, N:0.015～0.030Wt.%; The continuous casting and rolling technique of sheet bar parameter is: 900～1100 ℃ of strand charging temperatures, 1030～1200 ℃ of soaking temperatures, 950～1120 ℃ of start rolling temperatures, 830～920 ℃ of finishing temperatures, 550～650 ℃ of coiling temperatures.
2. method according to claim 1 is characterized in that the metallurgically optimization design at 700MPa Mpa V-N microalloyed high-strength weathering steel, and phosphorus content is to P≤0.015% in the attenuating steel.
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