CN101503782A - High strength anti-atmosphere corrosion steel and production method thereof - Google Patents
High strength anti-atmosphere corrosion steel and production method thereof Download PDFInfo
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Abstract
The invention relates to high-strength atmospheric corrosion resistant steel and a production method thereof, and belongs to the field of metallurgy. The technical problem to be solved by the invention is to provide the high-strength atmospheric corrosion resistant steel of which the yield strength is more than or equal to 550 MPa. The high-strength atmospheric corrosion resistant steel comprises the following chemical compositions in percentage by weight: less than or equal to 0.12 percent of carbon, less than or equal to 0.75 percent of silicon, less than or equal to 1.50 percent of manganese, less than or equal to 0.025 percent of phosphorus, less than or equal to 0.008 percent of sulfur, 0.30 to 1.25 percent of chromium, 0.12 to 0.65 percent of nickel, 0.20 to 0.55 percent of copper, 0.006 to 0.02 percent of titanium, more than 0.09 percent and less than or equal to 0.15 percent of vanadium, 0.01 to 0.02 percent of nitrogen, 0.015 to 0.03 percent of niobium, and the balance of iron and inevitable impurities. The high-strength atmospheric corrosion resistant steel has superior comprehensive properties of high strength, high toughness, high plasticity, obvious yield point and the like, and has wide application prospect.
Description
Technical field
The present invention relates to high-strength weather resisting steel and production method thereof, belong to field of metallurgy.
Background technology
The solidity to corrosion of weather resisting steel is different with the non-corrosive metal mechanism of action; be to shield by the rusty scale that the plain carbon stool surface generates; and copper, phosphorus, chromium, nickel are the effective elements of the raising steel atmospheric corrosion resistance of generally acknowledging always, and the most representative steel grade has the Cu-P-Cr-Ni series of high-weatherability and the Cu-Cr-Ni series that welded construction is used.
At present, " build up " technology such as acicular ferrite, ULCB and " superfine crystal particle " technology all can make the yield strength of weather resisting steel reach the 500MPa level, but economy, feasible method still are " microalloying " technology the most.Microalloying route based on Nb biases toward build up, therefore, has that hot rolling load is heavy, hot rolling technology control difficulty is big, shortcomings such as no remarkable yield point phenomenon appear in the stress-strain curve of the tension test of steel easily.
Application number is that 2008103042956 patent application discloses a kind of high-strength weather resisting steel and production method thereof, but the yield strength of this steel grade can only reach the 500MPa level, can't satisfy the needs of more high-intensity weather resisting steel.
Summary of the invention
Technical problem to be solved by this invention provides the high-strength weather resisting steel of a kind of yield strength 〉=550MPa.
High-strength weather resisting steel of the present invention, the weight percent of its chemical ingredients is: C :≤0.12%, Si :≤0.75%, Mn :≤1.50%, P :≤0.025%, S :≤0.008%, Cr:0.30～1.25%, Ni:0.12～0.65%, Cu:0.20～0.55%, Ti:0.006～0.02%, 0.09%＜V≤0.15%, N:0.01～0.02%, Nb:0.015～0.03%, surplus is Fe and unavoidable impurities.
Further, the rotten steel of above-mentioned high strength anti atmosphere is prepared by following method: this method comprises heating, hot rolling, laminar flow cooling, batches step, wherein, temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 875～910 ℃, and the temperature of batching in the step is 580～620 ℃.
Wherein, the yield strength 〉=550MPa of above-mentioned high-strength weather resisting steel.
Wherein, above-mentioned high-strength weather resisting steel, its tensile strength 〉=650MPa.
Wherein, above-mentioned high-strength weather resisting steel, its unit elongation 〉=18%, the ballistic work 〉=60J in the time of its-40 ℃.
The present invention also provides the preparation method of above-mentioned high-strength weather resisting steel.
The preparation method of high-strength weather resisting steel of the present invention, its production stage and existing high-strength steel processing step are basic identical, comprise heating, hot rolling, laminar flow cooling, batch step, wherein, temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 875～910 ℃, and the temperature of batching in the step is 580～620 ℃.
In the heating phase, in order to obtain high austenite solid solution nitrogen content, solid solution content of niobium and tiny austenite crystal, the Heating temperature in the described heating steps is 1230～1260 ℃.
Because the raising of content of vanadium, the production technique of high-strength weather resisting steel need be adjusted, otherwise mixed crystal appears in ferrite easily in the Finished Steel, and present spiculation trend, very easily cause the stress-strain curve no remarkable yield point and the toughness of tension test to reduce, the present invention is through a large amount of tests, to heating, hot rolling, laminar flow cooling, batch process and adjust, draw: when the finishing temperature in the hot-rolled step was controlled to be 875～910 ℃, rolling high-strength weather resisting steel more met the requirements.
When coiling temperature is lower than 580 ℃ of left and right sides, occur abnormal structures such as bainite easily, and the carbonitride of niobium (vanadium) is separated out difficulty.Therefore, the described coiling temperature that batches in the step is 580～620 ℃.
Beneficial effect of the present invention is: by vanadium, titanium, nitrogen, content of niobium and the hot rolling technology in the control steel billet, make weather resisting steel have high strength, high tenacity, high-ductility, excellent comprehensive performances such as tangible yield-point arranged, and have that hot rolling technology control difficulty is little, workable, method simple, suitable wide popularization and application and low cost and other advantages.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is further described.
The production and the performance measurement of embodiment 1 high-strength weather resisting steel of the present invention
Adopt 120 tons of LD converters and 1450 hot continuous rolling units (6 frame) production yield strength 550MPa grade high-strength weather resisting steel Q550NQR1, its production process is: steel billet → heating → hot rolling → laminar flow cools off → batches, the weight percent of the chemical ingredients of steel billet is: C:0.06%, Si:0.43%, Mn:0.92%, P:0.013%, S:0.005%, Cr:0.49%, Ni:0.21%, Cu:0.32%, V:0.12%, N:0.0163%, Ti:0.011%, Nb:0.023%, surplus is Fe and unavoidable impurities.Heating temperature in its heating steps is 1251 ℃, and the finishing temperature in the hot-rolled step is 879 ℃, and the temperature of batching in the step is 598 ℃.
After measured, the performance of the high-strength weather resisting steel of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work are respectively 590MPa (sharp yield point is arranged), 690MPa, 22% and 93J (3/4 size.The standard size of ballistic work is 10mm * 10mm * 55mm, but when steel plate thickness during less than 10mm, stipulates the sample of available 7.5mm * 10mm * 55mm and 5.0mm * 10mm * 55mm, and they are called 3/4 size and half-size scale respectively for short).
The production and the performance measurement of embodiment 2 high-strength atmospheric corrosion resistant hot-rolled strip steels of the present invention
Adopt 120 tons of LD converters and 1450 hot continuous rolling units (6 frame) production yield strength 550MPa grade high-strength weather resisting steel Q550NQR1, its production process is: steel billet → heating → hot rolling → laminar flow cools off → batches, the weight percent of the chemical ingredients of steel billet is: C:0.07%, Si:0.39%, Mn:0.97%, P:0.011%, S:0.006%, Cr:0.53%, Ni:0.25%, Cu:0.35%, V:0.10%, N:0.0139%, Ti:0.010%, Nb:0.020%, surplus is Fe and unavoidable impurities.Heating temperature in its heating steps is 1238 ℃, and the finishing temperature in the hot-rolled step is 895 ℃, and the temperature of batching in the step is 609 ℃.
After measured, the performance of the high-strength weather resisting steel of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work are respectively 575MPa (sharp yield point is arranged), 690MPa, 26% and 101J (3/4 size).
From embodiment 1,2 as can be seen, high-strength weather resisting steel of the present invention, its yield strength can reach more than the 575MPa, and has sharp yield point, and its tensile strength can reach more than the 690MPa.
Claims (7)
- [claim 1] high-strength weather resisting steel is characterized in that: the weight percent of its chemical ingredients is: C :≤0.12%, and Si :≤0.75%, Mn :≤1.50%, P :≤0.025%, S :≤0.008%, Cr:0.30～1.25%, Ni:0.12～0.65%, Cu:0.20～0.55%, Ti:0.006～0.02%, 0.09%＜V≤0.15%, N:0.01～0.02%, Nb:0.015～0.03%, surplus is Fe and unavoidable impurities.
- The rotten steel of [claim 2] high strength anti atmosphere according to claim 1, it is characterized in that: its production method comprises heating, hot rolling, laminar flow cooling, batches step, wherein, temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 875～910 ℃, and the temperature of batching in the step is 580～620 ℃.
- The rotten steel of [claim 3] high strength anti atmosphere according to claim 1 is characterized in that: its yield strength 〉=550Mpa.
- [claim 4] high-strength weather resisting steel according to claim 1 is characterized in that: its tensile strength 〉=650Mpa.
- [claim 5] high-strength weather resisting steel according to claim 1 is characterized in that: its unit elongation 〉=18%.
- [claim 6] high-strength weather resisting steel according to claim 1 is characterized in that: the ballistic work 〉=60J in the time of its-40 ℃.
- The production method of the described high-strength weather resisting steel of [claim 7] claim 1, comprise heating, hot rolling, laminar flow cooling, batch step, it is characterized in that: the temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 875～910 ℃, and the temperature of batching in the step is 580～620 ℃.
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| CN2009103010540A CN101503782B (en) | 2009-03-23 | 2009-03-23 | High strength anti-atmosphere corrosion steel and production method thereof |
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| CN101503782B CN101503782B (en) | 2010-09-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112013000747B4 (en) * | 2012-03-14 | 2015-07-09 | Baoshan Iron & Steel Co., Ltd. | Manufacturing process for strip casting of an atmosphere-corrosion-resistant steel strip with a quality of 550 MPa |
| CN106676424A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistant section steel molten steel, vanadium and niobium contained atmosphere corrosion resistant section steel and production method of vanadium and niobium contained atmosphere corrosion resistant section steel |
| CN106676421A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel of atmospheric corrosion resistant steel and titanium-nitrogen containing atmospheric corrosion resistant steel and production method thereof |
| CN106676425A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Chrome and niobium contained atmosphere corrosion resistant section steel molten steel, atmosphere corrosion resistant section steel and production method of atmosphere corrosion resistant section steel |
-
2009
- 2009-03-23 CN CN2009103010540A patent/CN101503782B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112013000747B4 (en) * | 2012-03-14 | 2015-07-09 | Baoshan Iron & Steel Co., Ltd. | Manufacturing process for strip casting of an atmosphere-corrosion-resistant steel strip with a quality of 550 MPa |
| CN106676424A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistant section steel molten steel, vanadium and niobium contained atmosphere corrosion resistant section steel and production method of vanadium and niobium contained atmosphere corrosion resistant section steel |
| CN106676421A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel of atmospheric corrosion resistant steel and titanium-nitrogen containing atmospheric corrosion resistant steel and production method thereof |
| CN106676425A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Chrome and niobium contained atmosphere corrosion resistant section steel molten steel, atmosphere corrosion resistant section steel and production method of atmosphere corrosion resistant section steel |
| CN106676421B (en) * | 2015-11-06 | 2019-03-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistance structural steel molten steel and titaniferous nitrogen atmosphere corrosion resistance structural steel and its production method |
| CN106676424B (en) * | 2015-11-06 | 2019-04-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistance structural steel molten steel and the atmosphere corrosion resistance structural steel of niobium containing vanadium and its production method |
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| CN101503782B (en) | 2010-09-08 |
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