CN103725969A - Novel low-cost 80mm Q390GJC steel plate and production method thereof - Google Patents
Novel low-cost 80mm Q390GJC steel plate and production method thereof Download PDFInfo
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- CN103725969A CN103725969A CN201310736961.4A CN201310736961A CN103725969A CN 103725969 A CN103725969 A CN 103725969A CN 201310736961 A CN201310736961 A CN 201310736961A CN 103725969 A CN103725969 A CN 103725969A
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Abstract
The invention provides a novel low-cost 80mm Q390GJC steel plate and a production method thereof. The Q390GJC low-alloy steel plate comprises the following chemical components in percentage by mass: 0.10-0.20% of C, 0.17-0.30% of Si, 1.00-1.40% of Mn, at most 0.018% of P, at most 0.005% of S, 0.010-0.035% of Ti, 0.15-0.30% of Als, 0.015-0.050% of V, 0.1-0.3 % of Cr, and the balance of Fe and residual elements. The production method comprises the following steps: converter smelting, continuous casting, slow cooling of casting blank, heating, TMCP (thermomechanical rolling process) and slow cooling. By using the novel composite microalloying component design idea and simple effective process design, the method ensures the mechanical properties, ultrasonic flaw detection index and other indexes of the steel plate.
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 Q390GJC Low Alloy Steel Plate and production method thereof.
Background technology
Along with developing rapidly of Chinese national economy, the development of Steels for High Rise Buildings is, extra wide thick towards spy, high-performance future development also.Steels for High Rise Buildings has proposed higher requirement to steel plate obdurability, yield tensile ratio, anti-lamellar tearing ability etc., steel plate for tall building more than thickness 80mm adds niobium alloy at present, the cost of steel plate is increased, along with the continuous reduction of steel industry profit, inside tap the latent power reduce ton steel cost put on agenda.
Under the prerequisite that guarantees steel mechanics performance, accomplish to reduce costs, optimization technological process, the steel plate of rolling is each time carried out to the sampling of piece piece and carry out mechanical property detection, and each block plate is carried out to composition, technique, tissue, performance analysis, formed a set of from Composition Design, steel billet smelting, steel plate rolling systematicness production technique.This technique can guarantee the requirement of final performance, has reduced again cost, for company has increased huge economic benefit.
Summary of the invention
For the problems referred to above, the inventor, through groping, has obtained a kind of 80mm guaranteed cost of low cost production, the Q390GJC steel plate of guarantor's flaw detection, thereby has completed the present invention.
Therefore, the object of the present invention is to provide a kind of low cost 80mm guaranteed cost, protect the Q390GJC Low Alloy Steel Plate of detecting a flaw.
Another object of the present invention is to provide the production method of this low cost steel plate.
For reaching above-mentioned first object, within the scope of national standard, and do not affect in the situation of end product quality, utilize Cr with low cost, V alloy element to replace a part of Nb alloying element, significantly reduce ton steel cost, expand product profit space.The chemical composition that Q390GJC Low Alloy Steel Plate of the present invention comprises following mass percent: C:0.10～0.20, Si:0.17～0.30, Mn:1.00～1.40, P :≤0.018, S :≤0.005, Ti:0.010-0.035, Als:0.15～0.30, other is Fe and relict element for V:0.015～0.050, Cr0.1-0.3.
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.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.Cr: significantly improve intensity, hardness and wear resistance.V: crystal grain thinning improves intensity, toughness.Ti: can be combined with C, N in steel, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the effect of the intensity of effective raising steel, because of Ti/C≤4 of Composition Design of the present invention, can on crystal boundary, not form the nitride of carbon and sulfide and cause the embrittlement of steel, causing the impact toughness decreased of steel plate.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon >=0.06%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process;
2,, after converter tapping during alloying, ferro-titanium added before aluminum steel, fix N element in advance, and minimizing may cause the AlN of crackle to form, front strong Argon leaving from station 3 minutes, soft blow argon >=8 minute;
3, adopt continuous casting protection pouring, 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 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃;
5, in described TMCP, 1050 ℃～1120 ℃ of start rolling temperatures; One-phase finishing temperature is at 950 ℃～1000 ℃, and two-stage start rolling temperature is at 830～850 ℃, 1.5～2 times of the steel thickness of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 45%, finishing temperature≤820 ℃; 760 ℃ of red temperature <, cooling rate is controlled at 3～8 ℃/s;
6,, in described slow cooling, enter burial pit temperature >=450 ℃; Heap cool time >=24 hour.
By combined microalloying Composition Design thinking and the brief effective process design of above novelty, the indexs such as the mechanical property, UT (Ultrasonic Testing) of steel plate have been guaranteed.
Embodiment
The chemical composition that Q390GJC Low Alloy Steel Plate of the present invention comprises following mass percent: C:0.10～0.20, Si:0.17～0.30, Mn:1.00～1.40, P :≤0.018, S :≤0.005, Ti:0.010-0.035, Als:0.15～0.30, other is Fe and relict element for V:0.015～0.050, Cr0.1-0.3.
For obtaining the said products, the production method that the present invention takes comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon >=0.06%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process;
2,, after converter tapping during alloying, ferro-titanium added before aluminum steel, fix N element in advance, and minimizing may cause the AlN of crackle to form, front strong Argon leaving from station 3 minutes, soft blow argon >=8 minute;
3, adopt continuous casting protection pouring, 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 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃;
5, in described TMCP, 1050 ℃～1120 ℃ of start rolling temperatures; One-phase finishing temperature is at 950 ℃～1000 ℃, and two-stage start rolling temperature is at 830～850 ℃, 1.5～2 times of the steel thickness of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 45%, finishing temperature≤820 ℃; 760 ℃ of red temperature <, cooling rate is controlled at 3～8 ℃/s;
6,, in described slow cooling, enter burial pit temperature >=450 ℃; Heap cool time >=24 hour.
Claims (2)
1. a novel low-cost 80mm Q390GJC steel plate, it is characterized in that the chemical composition that this steel plate comprises following mass percent: C:0.10～0.20, Si:0.17～0.30, Mn:1.00～1.40, P :≤0.018, S :≤0.005, Ti:0.010-0.035, Als:0.15～0.30, other is Fe and relict element for V:0.015～0.050, Cr0.1-0.3.
2. a production method for novel low-cost 80mm Q390GJC steel plate as claimed in claim 1, this production method comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling; Wherein in described converter smelting, tapping carbon >=0.06%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids slag under tapping process; After converter tapping, during alloying, ferro-titanium added before aluminum steel, fix N element in advance, and minimizing may cause the AlN of crackle to form, front strong Argon leaving from station 3 minutes, soft blow argon >=8 minute; Adopt continuous casting protection pouring, 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 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃; In described TMCP, 1050 ℃～1120 ℃ of start rolling temperatures; One-phase finishing temperature is at 950 ℃～1000 ℃, and two-stage start rolling temperature is at 830～850 ℃, 1.5～2 times of the steel thickness of drying in the air, and the two-stage is taked the little rolling of depressing, finish rolling accumulative total draft > 45%, finishing temperature≤820 ℃; 760 ℃ of red temperature <, cooling rate is controlled at 3～8 ℃/s; In described slow cooling, enter burial pit temperature >=450 ℃; Heap cool time >=24 hour.
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| CN201310736961.4A CN103725969A (en) | 2013-12-30 | 2013-12-30 | Novel low-cost 80mm Q390GJC steel plate and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876675A (en) * | 2020-07-08 | 2020-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Low-cost steel plate for high-rise building structure and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
| CN103243270A (en) * | 2012-12-30 | 2013-08-14 | 南阳汉冶特钢有限公司 | Novel low-cost, wear-resistant and high-strength Q460B steel plate and production method thereof |
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- 2013-12-30 CN CN201310736961.4A patent/CN103725969A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
| CN103243270A (en) * | 2012-12-30 | 2013-08-14 | 南阳汉冶特钢有限公司 | Novel low-cost, wear-resistant and high-strength Q460B steel plate and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 朱书成等: "高建筑用Q345GJC-Z35特厚钢板的研制", 《钢铁》, vol. 46, no. 12, 31 December 2011 (2011-12-31), pages 90 - 91 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876675A (en) * | 2020-07-08 | 2020-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Low-cost steel plate for high-rise building structure and production method thereof |
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Application publication date: 20140416 |