CN103725975A - Novel low-cost high-strength Q500 series steel plate and production method thereof - Google Patents
Novel low-cost high-strength Q500 series steel plate and production method thereof Download PDFInfo
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- CN103725975A CN103725975A CN201310736921.XA CN201310736921A CN103725975A CN 103725975 A CN103725975 A CN 103725975A CN 201310736921 A CN201310736921 A CN 201310736921A CN 103725975 A CN103725975 A CN 103725975A
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Abstract
The invention provides a novel low-cost high-strength Q500 series steel plate which comprises the following chemical components in percentage by mass: 0.04-0.1 percent of C, 0.1-0.40 percent of Si, 1.40-1.80 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 0.015-0.060 percent of Als, 0.005-0.06 percent of Ti, 0.20-0.60 percent of Cr, 0.03-0.09 percent of V, 0.0008-0.0025 percent of B and the balance of Fe and residual elements. The production method comprises the following steps: performing converter smelting, performing LF refining, performing VD vacuum treatment (alternative), continuous casting, performing slow cooling on a casting blank, heating, performing TMCP (Thermal Mechanical Control Processing) rolling and performing slow cooling. According to the design thought of novel composite microalloying components and simple and effective technological process design, the mechanical property, ultrasonic flaw detection and other indexes of the steel plate are guaranteed. Moreover, the wear resistance of the steel plate is improved. The steel plate produced by adopting the scheme is excellent in performance and excellent in flaw detection quality, has a certain wear resistance, can be widely applied to aspects such as engineering machinery, coal machinery and machine manufacturing and has high popularization significance.
Description
Technical field
The present invention relates to continuous casting and produce plate of moderate thickness field, be specifically related to a kind of novel low-cost high-strength steel Q500 series steel plate and production method thereof.
Background technology
Specification 10～80mm Q500 series is a kind of High Strength Structural Steel steel plate, and it has higher intensity, good cold deformation ability, and plasticity and toughness, can be widely used in the projects such as all kinds of engineering machinery, bridge, building, large-sized workshop, stadium preferably.But the continuous progress along with machine industry, improves constantly the index request of mechanical means and engineering machinery, existing High Strength Structural Steel Q500 series steel plate is difficult to meet the demands completely, and this new departure of ad hoc meter for this reason, to meet user's design requirement.
Summary of the invention
For the problems referred to above, the inventor, through groping, has obtained a kind of specification 10～80mm guaranteed cost, has protected the novel low-cost wear-resisting high-strength steel Q500 series steel plate of flaw detection, thereby completed the present invention.
Therefore, the object of the present invention is to provide the low-cost guaranteed cost of a kind of specification 10～80mm, protect the high-strength steel Q500 series steel plate of detecting a flaw.
Another object of the present invention is to provide the production method of the novel low-cost wear-resisting high-strength steel Q500 series steel plate with certain wear resisting property.
For reaching above-mentioned first object, within the scope of national standard, the alloying elements such as Mo, Ni that price in steel is high reduce, to reduce production costs.
The technical scheme that the present invention takes is the chemical composition (unit that above-mentioned novel low-cost high-strength steel Q500 series steel plate comprises following mass percent, wt%): C:0.04～0.1, Si:0.1～0.40, Mn:1.40～1.80, P :≤0.02, S :≤0.015, Als:0.015～0.060, Ti:0.005～0.06, Cr:0.20～0.60, V:0.03～0.09, B:0.0008～0.0025, other is Fe and relict element.
The reduction of the alloying element content such as Mo, Ni, can cause plate property to decline, bad stability, for guaranteeing the performance of steel plate, at process cost, change little in the situation that, utilize the Cr alloying element that price is lower to replace the alloying elements such as Mo, Ni, in the situation that reducing costs, reach the stability, uniformity of requirement performance index and performance, guarantee the overall quality index of steel plate.
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in steel, improve intensity, but C affects the welding property of steel and affects toughness.Si: be solution strengthening element, favourable to the intensity of raising steel plate.Mn: be solution strengthening element, all favourable to intensity and the toughness of raising steel plate, but easily segregation causes detecting a flaw defective.P: unfavorable to welding, and there is certain cold shortness, and in this steel grade, belong to harmful element, that should control is as far as possible low.S: easily form MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is as far as possible low.Al: can play grain refining intensificatiom effect.V, Ti: crystal grain thinning, the intensity of raising steel plate.Cr: chromium and iron form continuous solid solution, dwindle austenite region, significantly improve intensity and hardening capacity, and have good wear resisting property.B: significantly improve the hardening capacity of steel plate, improve armor plate strength.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, LF refining, VD vacuum-treat (optional), continuous casting, strand slow cooling, heating, TMCP rolling, slow cooling.
1, in described converter smelting, tapping carbon≤0.06%, tapping P≤0.018%, S≤0.020%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process; Argon station adds aluminum steel deoxidation.
2, in described LF refining, take the large quantity of slag to carry out slag making, more than guaranteeing that the white slag hold-time is controlled at 15min, after ferro-niobium, ferrotianium, ferrochrome, blow by force 3-5 minute, then more than soft blow 8min.
3, in described casting process, adopt whole process protection cast, cast superheating temperature is controlled at 5～20 ℃, and permanent pulling rate cast, enters burial pit slow cooling 24 hours after continuously cast bloom cutting.
4, in described adding, hanker, heat-up time 0.8-1.4min/mm, the holding temperature of soaking zone is controlled at 1200 ℃～1280 ℃.
5, in described TMCP, 1000 ℃～1100 ℃ of start rolling temperatures; One-phase finishing temperature is at 880～980 ℃, and two-stage start rolling temperature is at 800～900 ℃, steel thickness >=1.5 times of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 40%, finishing temperature≤880 ℃; 650 ℃ of red temperature <, cooling rate is controlled at 5～25 ℃/s.
6,, in described slow cooling, enter burial pit temperature >=150 ℃; Heap cool time >=6 hour.
By combined microalloying Composition Design thinking and the brief effective process design of above novelty, guaranteed the index such as mechanical property, UT (Ultrasonic Testing) of steel plate; And improved the wear resisting property of steel plate.Take plate property that such scheme produces evenly, flaw detection good quality, and there is certain wear resisting property, can be widely used in the aspects such as engineering machinery, coal machine profession, machinofacture, be with the promotion of good sense.
Embodiment
Chemical composition (the unit that novel low-cost high-strength steel Q500 series steel plate of the present invention comprises following mass percent, wt%): C:0.04～0.1, Si:0.1～0.40, Mn:1.40～1.80, P :≤0.02, S :≤0.015, Als:0.015～0.060, Ti:0.005～0.06, Cr:0.20～0.60, V:0.03～0.09, B:0.0008～0.0025, other is Fe and relict element.
For obtaining above-mentioned steel plate, the production method that the present invention takes comprises: converter smelting, LF refining, VD vacuum-treat (optional), continuous casting, strand slow cooling, heating, TMCP rolling, slow cooling.
1, in described converter smelting, tapping carbon≤0.06%, tapping P≤0.018%, S≤0.020%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process; Argon station adds aluminum steel deoxidation.
2, in described LF refining, take the large quantity of slag to carry out slag making, more than guaranteeing that the white slag hold-time is controlled at 15min, after ferro-niobium, ferrotianium, ferrochrome, blow by force 3-5 minute, then more than soft blow 8min.
3, in described casting process, adopt whole process protection cast, cast superheating temperature is controlled at 5～20 ℃, and permanent pulling rate cast, enters burial pit slow cooling 24 hours after continuously cast bloom cutting.
4, in described adding, hanker, heat-up time 0.8-1.4min/mm, the holding temperature of soaking zone is controlled at 1200 ℃～1280 ℃.
5, in described TMCP, 1000 ℃～1100 ℃ of start rolling temperatures; One-phase finishing temperature is at 880～980 ℃, and two-stage start rolling temperature is at 800～900 ℃, steel thickness >=1.5 times of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 40%, finishing temperature≤880 ℃; 650 ℃ of red temperature <, cooling rate is controlled at 5～25 ℃/s.
6,, in described slow cooling, enter burial pit temperature >=150 ℃; Heap cool time >=6 hour.
By combined microalloying Composition Design thinking and the brief effective process design of above novelty, guaranteed the index such as mechanical property, UT (Ultrasonic Testing) of steel plate; And improved the wear resisting property of steel plate.
Claims (2)
1. a novel low-cost high-strength steel Q500 series steel plate, it is characterized in that the chemical composition that described steel plate comprises following mass percent: C:0.04～0.1, Si:0.1～0.40, Mn:1.40～1.80, P :≤0.02, S :≤0.015, Als:0.015～0.060, Ti:0.005～0.06, Cr:0.20～0.60, V:0.03～0.09, B:0.0008～0.0025, other is Fe and relict element.
2. a production method for novel low-cost high-strength steel Q500 series steel plate as claimed in claim 1, this production method comprises: converter smelting, LF refining, VD vacuum-treat (optional), continuous casting, strand slow cooling, heating, TMCP rolling, slow cooling; Wherein in described converter smelting, tapping carbon≤0.06%, tapping P≤0.018%, S≤0.020%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process; Argon station adds aluminum steel deoxidation; In described LF refining, take the large quantity of slag to carry out slag making, more than guaranteeing that the white slag hold-time is controlled at 15min, after ferro-niobium, ferrotianium, ferrochrome, blow by force 3-5 minute, then more than soft blow 8min; In described casting process, adopt whole process protection cast, cast superheating temperature is controlled at 5～20 ℃, and permanent pulling rate cast, enters burial pit slow cooling 24 hours after continuously cast bloom cutting; In described adding, hanker, heat-up time 0.8-1.4min/mm, the holding temperature of soaking zone is controlled at 1200 ℃～1280 ℃; In described TMCP, 1000 ℃～1100 ℃ of start rolling temperatures; One-phase finishing temperature is at 880～980 ℃, and two-stage start rolling temperature is at 800～900 ℃, steel thickness >=1.5 times of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 40%, finishing temperature≤880 ℃; 650 ℃ of red temperature <, cooling rate is controlled at 5～25 ℃/s; In described slow cooling, enter burial pit temperature >=150 ℃; Heap cool time >=6 hour.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004892A (en) * | 2014-06-18 | 2014-08-27 | 济钢集团有限公司 | 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof |
| CN105648329A (en) * | 2016-03-09 | 2016-06-08 | 山东钢铁股份有限公司 | Control rolling and high strength ship-plate steel and producing method thereof |
| CN115637381A (en) * | 2022-09-28 | 2023-01-24 | 南京钢铁股份有限公司 | Low-cost Q500GJ steel plate for high-rise building and manufacturing method thereof |
| CN116005081A (en) * | 2022-12-06 | 2023-04-25 | 南阳汉冶特钢有限公司 | Low-cost Q550D steel plate replacing Mo with V and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928891A (en) * | 2010-08-23 | 2010-12-29 | 首钢总公司 | Wearable steel plate with low cost and high strength and producing method thereof |
| CN102051522A (en) * | 2010-12-21 | 2011-05-11 | 南阳汉冶特钢有限公司 | Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof |
| CN103014522A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Novel low-cost wear-resistant high-strength Q550D steel plate and production method thereof |
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2013
- 2013-12-30 CN CN201310736921.XA patent/CN103725975A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928891A (en) * | 2010-08-23 | 2010-12-29 | 首钢总公司 | Wearable steel plate with low cost and high strength and producing method thereof |
| CN102051522A (en) * | 2010-12-21 | 2011-05-11 | 南阳汉冶特钢有限公司 | Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof |
| CN103014522A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Novel low-cost wear-resistant high-strength Q550D steel plate and production method thereof |
Non-Patent Citations (2)
| Title |
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| 刘徐源等: "《中华人民共和国国家标准，GB/T 1591-2008》", 6 December 2008 * |
| 刘徐源等: "《中华人民共和国国家标准，GB/T 1591-2008》", 6 December 2008, article "低合金高强度结构钢", pages: 3 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004892A (en) * | 2014-06-18 | 2014-08-27 | 济钢集团有限公司 | 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof |
| CN105648329A (en) * | 2016-03-09 | 2016-06-08 | 山东钢铁股份有限公司 | Control rolling and high strength ship-plate steel and producing method thereof |
| CN115637381A (en) * | 2022-09-28 | 2023-01-24 | 南京钢铁股份有限公司 | Low-cost Q500GJ steel plate for high-rise building and manufacturing method thereof |
| CN116005081A (en) * | 2022-12-06 | 2023-04-25 | 南阳汉冶特钢有限公司 | Low-cost Q550D steel plate replacing Mo with V and production method thereof |
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Application publication date: 20140416 |