CN101185939A - Production technology of Q420qD bridge plate - Google Patents
Production technology of Q420qD bridge plate Download PDFInfo
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- CN101185939A CN101185939A CNA2007100931751A CN200710093175A CN101185939A CN 101185939 A CN101185939 A CN 101185939A CN A2007100931751 A CNA2007100931751 A CN A2007100931751A CN 200710093175 A CN200710093175 A CN 200710093175A CN 101185939 A CN101185939 A CN 101185939A
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Abstract
The invention discloses a production technique of Q420qD bridge plate, which comprises component control and controlled rolling process, wherein, the controlled rolling process is divided into two phases: the first phase comprises all the gates of the rough rolling and a first rolling length of the precision rolling, and the second phase comprises a second rolling length of the precision rolling and the finish rolling. The component control controls the following components: 0.11-0.17 percent of C, 0.20-0.55 percent of Si, 1.3-1.7 percent of Mn, 0.02-0.07 percent of Alt, Nb0.02-0.045%, 0.02-0.045 percent of Ti, 0.4-0.45 percent of Ceq; the initial rolling temperature of the second rolling length is 890 DEG C to 920 DEG C, the cumulative deformation of the second rolling length is 45 percent to 55 percent; the finish rolling temperature is 800 DEG C to 870 DEG C; the invention uses the existing equipment of the old steel enterprise to produce qualified and market competitive Q420qD bridge plate without reforming the equipment, thus saving the fund.
Description
Technical field
The present invention relates to a kind of steel plate production technology, particularly a kind of Q420qD bridge plate production technology.
Background technology
Low-alloy high-strength steel plate intensity height, from advantages such as heavy and light, process-cycle are short, anti-seismic performance is good, application is more and more widely.Domestic a lot of iron and steel enterprise, owing to be the later stage development, equipment is more advanced, thereby the production development of Hi-Stren steel is also very fast.But a lot of iron and steel enterprises are backward relatively owing to equipment, the influence of hand apparatus, and low-alloy high-strength plate production difficulty is relatively large.If simple transformation process units, then cost is than higher.And in market economy flourishing all the more present stage, old iron and steel enterprise must develop low-alloy high-strength steel plate.Develop rapidly and rapid development of science and technology along with bridge construction, also more and more higher to bridge with the requirement of guiding principle, low-alloy high-strength bridge steel plate---Q420qD uses one of kind of steel as bridge in the prior art, also become one of major product of old iron and steel enterprise exploitation.
Therefore, need a kind of Q420qD bridge plate production technology, utilize the existing equipment of old iron and steel enterprise, produce qualified Q420qD bridge plate with market competitiveness.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of Q420qD bridge plate production technology, utilize the existing equipment of old iron and steel enterprise, do not need scrap build, the saving fund, and can produce qualified Q420qD bridge plate with market competitiveness.
Q420qD bridge plate production technology of the present invention, comprise Composition Control and controlled rolling process, wherein controlled rolling process is divided into two stages, and the phase I is whole passages of roughing and first rolling process of finish rolling, second stage comprises second rolling process and the finish to gauge of finish rolling, control following composition: C0.11-0.17% in the Composition Control, Si0.20-0.55%, Mn1.3-1.7%, Alt0.02%-0.07%, Nb0.02-0.045%, Ti0.01-0.02%, Ceq 0.4-0.45%;
The start rolling temperature of described second rolling process is 890 ℃-920 ℃, and the second rolling process cumulative deformation is 45%-55%; Described finishing temperature is 800 ℃-870 ℃.
Further, also add V 0.03-in the Composition Control less than 0.08%, N 0.014-is less than 0.018%; Also comprise the normalizing process after the finish to gauge, normalizing temperature is 900-920 ℃, normalizing insulation parameter: steel plate is thick≤16mm is 1.6-1.8min/mm, and steel plate is thick＞16-26mm is 1.5-1.7min/mm, and steel plate is thick＞and 26mm is 1.3-1.5min/mm;
Further, control following composition: C 0.15% in the described Composition Control, Si 0.3%, and Mn 1.5%, and Alt is greater than 0.03%, and Nb 0.03%, and Ti 0.015%, and Ceq 0.42%;
Further, in the described control, V0.05%, N0.015%; Also comprise the normalizing process after the finish to gauge, normalizing temperature is 910 ℃, normalizing insulation parameter: steel plate is thick≤16mm is 1.7min/mm, and steel plate is thick＞16-26mm is 1.6min/mm, and steel plate is thick＞and 26mm is 1.4min/mm;
Further, the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Described finishing temperature is 850 ℃.
The invention has the beneficial effects as follows: Q420qD bridge plate production technology of the present invention, in internal control composition, control start rolling temperature, cumulative deformation and the finishing temperature of second rolling process, utilize the existing equipment of old iron and steel enterprise, do not need scrap build, the saving fund, and can produce qualified Q420qD bridge plate with market competitiveness; Control the start rolling temperature of second rolling process, purpose is to guarantee that second rolling process is not rolling at crystal region at austenite, austenite crystal is elongated and produces a large amount of Zona transformans, thereby increase the phase transformation nucleation site of austenite when ferritic transformation, reach the ferritic purpose of refinement; Control the cumulative deformation of second rolling process, thereby purpose is to guarantee that steel plate has enough distortion to guarantee that austenite produces a large amount of Zona transformans, reaches the purpose of refinement structure of steel in second rolling process; The control finishing temperature is not allow the low excessively characteristics of finishing temperature in order to adapt to existing retrospective installation, and guarantees the fineness of austenite crystal.Q420qD bridge plate quality and the contrast of national requirements standard of adopting explained hereafter of the present invention to go out see the following form:
| Thickness mm | Surrender MPa | Tension MPa | Extend % | Vertical-20 ℃ of AKV-J | AKVS | |
| ≥ | ||||||
| Standard | ≤16 | 420 | 570 | 20 | 47 | 47 |
| ＞16-35 | 410 | 550 | 19 | 47 | 47 | |
| ＞35-50 | 400 | 540 | 19 | 47 | 47 | |
| This product | ≤16 | 470 | 590 | 24.5 | 91 | 96 |
| ＞16-35 | 445 | 585 | 23.5 | 142 | 152 | |
| 36 | 445 | 575 | 23.5 | 69 | 105 | |
As can be seen from the above table, the Q420qD bridge plate quality that this explained hereafter goes out surpasses national standard, has the stronger market competitiveness.
The specific embodiment
Embodiment one
Present embodiment is produced Q420qD bridge plate 1T, and steel plate thickness is 16mm.
Present embodiment Q420qD bridge plate production technology comprises Composition Control and controlled rolling process, and wherein controlled rolling process is divided into two stages, phase I is whole passages of roughing and first rolling process of finish rolling, and second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C 0.11% in the Composition Control, Si 0.20%, Mn 1.3%, Alt 0.02.5%, and Nb 0.02%, Ti 0.01%, Ceq 0.4%, and V 0.03%, and N 0.014%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 890 ℃, and the second rolling process cumulative deformation is 45%; Finishing temperature is 800 ℃.
Adopt following normalizing process normalizing after the finish to gauge: normalizing temperature is 900 ℃, normalizing insulation parameter 1.6min/mm.
Embodiment two
Present embodiment is produced Q420qD bridge plate 1T, and steel plate thickness is 26.
Present embodiment Q420qD bridge plate production technology comprises Composition Control and controlled rolling process, and wherein controlled rolling process is divided into two stages, phase I is whole passages of roughing and first rolling process of finish rolling, and second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C0.15% in the Composition Control, Si0.3%, Mn 1.5%, and Alt 0.03%, Nb0.03%, Ti 0.015%, Ceq 0.42%, V0.05%, N0.015%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 920 ℃, and the second rolling process cumulative deformation is 55%; Finishing temperature is 870 ℃.
Adopt following normalizing process normalizing after the finish to gauge: normalizing temperature is 910 ℃, and normalizing insulation parameter: steel plate is thick to be 1.7min/mm.
Embodiment three
Present embodiment is produced Q420qD bridge plate 1T, and steel plate thickness is 27mm.
Present embodiment Q420qD bridge plate production technology comprises Composition Control and controlled rolling process, and wherein controlled rolling process is divided into two stages, phase I is whole passages of roughing and first rolling process of finish rolling, and second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C 0.165% in the Composition Control, Si 0.55%, Mn 1.65%, and Alt 0.04%, and Nb 0.04%, Ti 0.019%, Ceq 0.44%, and V 0.075%, and N 0.017%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Finishing temperature is 850 ℃.
Adopt following normalizing process normalizing after the finish to gauge: normalizing temperature is 920 ℃, and normalizing insulation parameter is 1.4min/mm.
Embodiment four
Present embodiment is produced Q420qD bridge plate 1T.
Present embodiment Q420qD bridge plate production technology, comprise Composition Control and controlled rolling process, wherein controlled rolling process is divided into two stages, and the phase I is whole passages of roughing and first rolling process of finish rolling, second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C0.11% in the Composition Control, Si0.20%, Mn1.3%, Alt 0.06%, Nb0.02%, Ti 0.01%, and Ceq 0.4%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 890 ℃, and the second rolling process cumulative deformation is 45%; Finishing temperature is 800 ℃.
Embodiment five
Present embodiment is produced Q420qD bridge plate 1T.
Present embodiment Q420qD bridge plate production technology, comprise Composition Control and controlled rolling process, wherein controlled rolling process is divided into two stages, and the phase I is whole passages of roughing and first rolling process of finish rolling, second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C0.15% in the Composition Control, Si0.3%, Mn1.5%, Alt0.07%, Nb0.03%, Ti 0.01.5%, Ceq 0.42%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 920 ℃, and the second rolling process cumulative deformation is 55%; Finishing temperature is 870 ℃.
Embodiment six
Present embodiment is produced Q420qD bridge plate 1T.
Present embodiment Q420qD bridge plate production technology, comprise Composition Control and controlled rolling process, wherein controlled rolling process is divided into two stages, and the phase I is whole passages of roughing and first rolling process of finish rolling, second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C 0.165% in the Composition Control, Si0.55%, Mn1.65%, Alt 0.05%, Nb 0.04%, and Ti 0.019%, and Ceq 0.44%;
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Finishing temperature is 850 ℃.Adopt conventional normalizing process normalizing after the finish to gauge.
Whole passages of roughing and first rolling process of finish rolling adopt conventional steel plate steel rolling process, and the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Finishing temperature is 850 ℃.
Above embodiment just plays the effect that clearly demonstrates to the present invention, and above numerical value can be adjusted within the specific limits, also can be other materials that can realize goal of the invention.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can carry out within the specific limits modification to technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. Q420qD bridge plate production technology, comprise Composition Control and controlled rolling process, wherein controlled rolling process is divided into two stages, and the phase I is whole passages of roughing and first rolling process of finish rolling, second stage comprises second rolling process and the finish to gauge of finish rolling, it is characterized in that: control following composition: C0.11-0.17% in the Composition Control, Si0.20-0.55%, Mn1.3-1.7%, Alt0.02%-0.07%, Nb0.02-0.045%, Ti0.01-0.02%, Ceq 0.4-0.45%;
The start rolling temperature of described second rolling process is 890 ℃-920 ℃, and the second rolling process cumulative deformation is 45%-55%; Described finishing temperature is 800 ℃-870 ℃.
2. Q420qD bridge plate production technology according to claim 1 is characterized in that: also add V0.03-in the Composition Control less than 0.08%, N0.014-is less than 0.018%; Also comprise the normalizing process after the finish to gauge, normalizing temperature is 900-920 ℃, normalizing insulation parameter: steel plate is thick≤16mm is 1.6-1.8min/mm, and steel plate is thick＞16-26mm is 1.5-1.7min/mm, and steel plate is thick＞and 26mm is 1.3-1.5min/mm.
3. Q420qD bridge plate production technology according to claim 1 and 2 is characterized in that: control following composition: C0.15% in the described Composition Control, and Si0.3%, Mn1.5%, Alt be greater than 0.03%, Nb0.03%, Ti 0.015%, and Ceq 0.42%.
4. Q420qD bridge plate production technology according to claim 2 is characterized in that: in the described control, and V0.05%, N0.015%; Also comprise the normalizing process after the finish to gauge, normalizing temperature is 910 ℃, normalizing insulation parameter: steel plate is thick≤16mm is 1.7min/mm, and steel plate is thick＞16-26mm is 1.6min/mm, and steel plate is thick＞and 26mm is 1.4min/mm.
5. according to claim 1 or 2 or 4 described Q420qD bridge plate production technologies, it is characterized in that: the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Described finishing temperature is 850 ℃.
6. Q420qD bridge plate production technology according to claim 3 is characterized in that: the start rolling temperature of described second rolling process is 900 ℃, and the second rolling process cumulative deformation is 50%; Described finishing temperature is 850 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100931751A CN101185939A (en) | 2007-12-19 | 2007-12-19 | Production technology of Q420qD bridge plate |
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| CNA2007100931751A CN101185939A (en) | 2007-12-19 | 2007-12-19 | Production technology of Q420qD bridge plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051525A (en) * | 2010-12-07 | 2011-05-11 | 秦皇岛首秦金属材料有限公司 | Method for producing steel plate used for Q420qE bridge at low cost |
| CN103361551A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying based high toughness ship board and preparation method thereof |
| CN103667655A (en) * | 2013-12-10 | 2014-03-26 | 南京钢铁股份有限公司 | Production method of cord thread steel wire rod with diameter of 5mm |
| CN108914010A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | A kind of low-cost high-strength low-alloy steel and its manufacturing method |
| CN112553519A (en) * | 2020-11-13 | 2021-03-26 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
-
2007
- 2007-12-19 CN CNA2007100931751A patent/CN101185939A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051525A (en) * | 2010-12-07 | 2011-05-11 | 秦皇岛首秦金属材料有限公司 | Method for producing steel plate used for Q420qE bridge at low cost |
| CN103361551A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying based high toughness ship board and preparation method thereof |
| CN103667655A (en) * | 2013-12-10 | 2014-03-26 | 南京钢铁股份有限公司 | Production method of cord thread steel wire rod with diameter of 5mm |
| CN103667655B (en) * | 2013-12-10 | 2015-05-27 | 南京钢铁股份有限公司 | Production method of cord thread steel wire rod with diameter of 5mm |
| CN108914010A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | A kind of low-cost high-strength low-alloy steel and its manufacturing method |
| CN112553519A (en) * | 2020-11-13 | 2021-03-26 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
| CN112553519B (en) * | 2020-11-13 | 2021-12-10 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
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Open date: 20080528 |