CN101876001A - Method for improving low-temperature impact toughness of high strength thick steel plate - Google Patents
Method for improving low-temperature impact toughness of high strength thick steel plate Download PDFInfo
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Abstract
The invention discloses a production method for improving the low-temperature impact toughness of a high strength thick steel plate, and belongs to the technical field of medium and thick steel plate production. The steel comprises the following chemical compositions: 0.05 to 0.15 percent of C, 0.15 to 0.40 percent of Si, 0.90 to 1.60 percent of Mn, less than 0.01 percent of P, less than 0.01 percent of S, 0.10 to 0.80 percent of Ni, 0.1 to 0.5 percent of Mo, 0.0008 to 0.0015 percent of B, 0.01 to 0.06 percent of microalloy element Nb, 0.01 to 0.07 percent of V, 0.01 to 0.03 percent of Ti and the balance of Fe; the thick steel plate is produced by soft reduction technology in a continuous casting process under the condition that a compression ratio is less than 4.0; and by a heat treatment process which comprises the steps of quenching, quenching and tempering, the texture of the steel plate after double quenching is controlled to be a hybrid texture with a hard phase and a soft phase, and the requirements on steel plate strength and low-temperature toughness are met at the same time. Under a small compression ratio, the thick steel plate has the performance equivalent to that of a thin steel plate by the combination of the heat treatment process and texture control; and compared with the methods such as die casting, forging and the like, the method is simple and feasible, and has high yield and low production cost.
Description
Technical field
The invention belongs to the steel plate production technical field, a kind of method that is used to improve high-strength steel plate impelling strength particularly is provided.Main employing is gently depressed and modified heat-treating methods of two stages, improves the impelling strength of high tensile steel plate and the impelling strength of heart portion at compression ratio under smaller or equal to 3 condition.
Background technology
Usually, when the compression ratio of steel plate less than 4 the time, steel plate in the operation of rolling because distortion infiltration and grain refining are not enough, thereby cause the impelling strength of steel plate to worsen, especially the toughness of steel plate heart portion worsens more., strict at high tensile steel plate to the impelling strength of the thickness direction of steel plate in particular for the steel plate under the complicated applied force situations such as multidirectional pressure-bearing, when guaranteeing steel plate high strength, low yield strength ratio, guarantee that the impelling strength of steel plate is good.Therefore, in the manufacturing processed of steel plate, can require the compression ratio of steel plate to be not less than 4.0 usually.Produce the high tensile steel plate of the above thickness of 75mm, just require to adopt the continuous casting steel billet of the above thickness of 300mm.
At present, China is 320mm at the slab thickness of the maximum ga(u)ge of producing, and according to 4.0 compression ratio requirement, maximum can only guarantee the requirement of 80mm thick and high-strength steel plate.In maximization, high-parameters development such as current large-scale steel structure, pressurized vessel, also intensity, the thickness to steel plate has proposed more and more higher requirement.Be subjected to the influence of current China slab caster thickness, also need dependence on import less than 4.0 high-strength and high-ductility steel plate for compression ratio.
In the production of high-strength thick-specification steel plate, can adopt die casting to guarantee the compression ratio of steel plate, but characteristics such as lumber recovery is low, production efficiency is low, cost height that die casting has, and it is lower to be moulded into the popularity rate of domestic plate of moderate thickness enterprise, can not become the Eco-power mode of production.Utilize high-quality sheet billet continuous casting to produce the trend that high-quality super-thick steel plate has become the iron and steel technical development.Aspect high reliability super-thick steel plate manufacturing technology, JFE company adopts the high quality continuous casting steel billet, developed by forging a rolling technology and made the technology of super-thick steel plate, can produce the super-thick steel plate that thickness is 240mm (depress than be 1.29) to the maximum with the thick continuously cast bloom of 310mm with good internal soundness.
Summary of the invention
The object of the present invention is to provide a kind of method that improves high-strength steel plate impelling strength, by adopting high-quality slab, compression ratio less than 4.0 condition under, by rational rolling and heat treating regime, when satisfying armor plate strength, effectively improve the method for steel plate impelling strength, armor plate strength is more than 600MPa,-20 ℃ of low-temperature impact toughness are more than 100J, and steel plate heart portion-20 ℃ low-temperature impact toughness is more than 80J.
The slab chemical ingredients (weight %) that the present invention adopts is: C0.05-0.15%, Si0.15-0.40%, Mn0.90-1.60%, P＜0.01%, S＜0.01%, Ni0.10-0.80%, Mo0.1-0.50%, B0.0008-0.0015%, microalloy element Nb0.01-0.06%, V0.01-0.08%, Ti0.01-0.03%, surplus is Fe.
Production technique of the present invention is as follows:
(1) continuous casting process adopts the technology of dynamically gently depressing;
(2) rolling technology: continuous casting steel billet is heated to 1100～1250 ℃, time inside furnace 300～350 minutes, 1200 ℃ of tapping temperatures; Adopt the 19MPa high pressure water to carry out de-scaling before steel billet rolls, fully remove the billet surface iron scale and guarantee the surface cleaning light; Start rolling temperature falls 30 ℃ with reference to tapping temperature, adopts directly rollingly, changes steel before the machine, and the single pass draft is greater than 15%, and finishing temperature is in 970～1020 ℃;
(3) roll postcooling technology: enter the ACC cooled region after steel plate rolls fast, final cooling temperature is at 600～700 ± 20 ℃;
(4) the steel plate primary quenching is handled, and quenching temperature is 900～950 ℃;
(5) steel plate carries out secondary quenching, and quenching temperature is 700～920 ℃;
(6) the steel plate high tempering is handled, and tempering temperature is 450～700 ℃;
The tissue that is organized as martensite+bainite after steel plate carries out quenching for the first time, the mixed structure that is organized as martensite+ferrite+bainite after quenching for the second time.
Characteristics of the present invention are to adopt carries out repeatedly thermal treatment to steel plate, sandwiches the intercritical hardening of one or many in the middle of normal quenching and tempering, has obtained the tiny residual austenite that small-amount free ferrite+martensite+disperse distributes behind the intercritical hardening.Detrimental impurity such as phosphorus concentrate in the ferrite crystal grain, not on original austenite crystal prevention.Residual austenite makes crack propagation become difficult, makes stress relaxation because of being subjected to viscous deformation or producing the part martensitic transformation, and the fragility of steel is reduced.
Utilize repeatedly the characteristics of thermal treatment process raising high strength special heavy plate impelling strength as follows:
1, steel plate can obtain high strength, high tenacity under lower compression ratio;
2, the impelling strength of steel plate 1/4 thickness and heart portion is uniform and stable;
3, under the situation that does not increase the steel plate carbon equivalent, guarantee that steel plate has high strength when thickness increases, because the Pcm value does not increase, guaranteed that steel plate has the welding property with the thin specification steel plate unanimity simultaneously.
The invention has the advantages that, the steel plate compression ratio less than 4.0 condition under, do not increase the thickness of continuous casting steel billet, under lower compression ratio, obtain the steel plate of high-intensity high-tenacity, reduced the dependency of steel plate thickness to slab thickness.By adopting repeatedly thermal treatment, though increased the treatment time of heat treatment step, produce super-thick steel plate with modes such as adopting die casting, forging and compare, have efficiently, characteristics cheaply.
Description of drawings
Accompanying drawing 1, Fig. 2, Fig. 3, Fig. 4 are the metallographic structure of embodiment.Fig. 5, Fig. 6, Fig. 7 are the tissue of steel plate intercritical hardening rear surface, thickness 1/4 and heart portion.
Embodiment
Embodiment 1
C≤0.15% in the slab chemical ingredients that the present invention adopts.Slab to 250mm thickness cools off after employing on the plate mill is directly rolling, and rolling back steel plate thickness is 80mm, and the steel plate compression ratio is 3.13.Carry out 930 ℃ quench treatment to rolling the back steel plate, carried out quenching for the second time under 880 ℃ subsequently, in normalizing furnace, carried out 550 ℃ of average temperings.The tissue of surface of steel plate behind the intercritical hardening and heart portion such as accompanying drawing 1, shown in Figure 2, the tissue of surface of steel plate after the tempering and heart portion such as accompanying drawing 3, shown in Figure 4.
Table 1 is for adopting with the performance of composition stack pile slab according to the 40mm steel plate of ordinary production explained hereafter.The mechanical property of the 80mm steel plate after above-mentioned art breading is as shown in table 2.
Table 240mm steel plate mechanical property
Table 2 embodiment 1 steel plate mechanical properties test result
Implement sharp steel plate through after the above-mentioned art breading, under 3.13 compression ratio, the thick steel plate of 80mm no matter at width still at thickness direction, its heart portion all shows good low-temperature impact toughness.With adopting compression ratio with the production of chemical composition stack pile slab is that 6.25 40mm steel plate is compared, and compression ratio is that 3.125 80mm steel plate has shown good obdurability coupling equally.
Embodiment 2
Embodiment 2 further reduces the compression ratio of steel plate on the basis of embodiment 1, adopt the thick steel billet of 320mm to make the 150mm Plate Steel.C in the steel billet chemical ingredients≤0.15%.It is thick to adopt direct rolling that steel billet is once rolled 150mm on plate mill, and compression ratio is 2.13.Steel plate rolled the back cooling in heap 48 hours, and the flaw detection of I level is all qualified, shows that steel plate does not have obvious subsurface defect.Carry out quench hot after the 150mm Plate Steel is heated to 930 ℃, reheat to 850 ℃ carries out the second time and quenches subsequently, carries out 650 ℃ high tempering at last in normalizing furnace.Fig. 5, Fig. 6, Fig. 7 are the tissue of steel plate intercritical hardening rear surface, thickness 1/4 and heart portion, and table 3 is for handling the mechanical property of back 150mm steel plate.
Table 3 embodiment 2 steel plate mechanical properties test results
As can be seen from Table 3, the steel plate of embodiment 2 has only at compression ratio under 2.13 the situation, has still obtained preferable obdurability coupling, and-20 ℃ of impact properties of steel plate heart portion are all more than 50J, the Z of steel plate has reached more than the Z35 to performance simultaneously, meets every requirement of high-performance super-thick steel plate fully.It is 2.0 super-thick steel plate that method described in the present invention can be made compression ratio.
Claims (2)
1. method that improves high-strength thick-specification steel plate low-temperature impact toughness, the chemical ingredients of steel is: C0.05-0.15%, Si 0.15-0.40%,, Mn 0.90-1.60%, P＜0.01%,, S＜0.01%, Ni0.10-0.80%, Mo 0.1-0.50%, B 0.0008-0.0015%, microalloy element Nb 0.01-0.06%, V 0.01-0.07%, Ti 0.01-0.03%, surplus is Fe; All be weight percentage; It is characterized in that: production technique is:
(1) continuous casting process adopts the technology of dynamically gently depressing;
(2) rolling technology: continuous casting steel billet is heated to 1100～1250 ℃, time inside furnace 300～350 minutes, 1200～1250 ℃ of tapping temperatures; Adopt the 19MPa high pressure water to carry out de-scaling before steel billet rolls, fully remove the billet surface iron scale and guarantee the surface cleaning light; Start rolling temperature falls 30 ℃ with reference to tapping temperature, adopts directly rollingly, changes steel before the machine, and the single pass draft is greater than 15%, and finishing temperature is in 970～1020 ℃;
(3) roll postcooling technology: 10～30 ℃/s of speed of cooling, final cooling temperature is at 600～650 ℃;
(4) quench after the steel plate cooling, quenching temperature is 900～950 ℃;
(5) steel plate carries out secondary quenching, and quenching temperature is 700～920 ℃;
(6) the steel plate average tempering is handled, and tempering temperature is 500～700 ℃.
2. the method for claim 1, the mixed structure that is organized as ferrite+martensite+bainite behind this steel plate secondary quenching, steel plate is organized as the mixed structure of ferrite+tempered sorbite+tempering bainite after the tempering.
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Cited By (19)
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| CN102021304A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Heat processing technology for super-standard large-section pressure vessel tube plate |
| CN102125947A (en) * | 2010-12-21 | 2011-07-20 | 南阳汉冶特钢有限公司 | Method for flattening super-thick steel plates with temperature |
| CN102615114A (en) * | 2012-03-30 | 2012-08-01 | 南京钢铁股份有限公司 | Method for temperature-controlling and rolling ribbon steel for chain manufacture |
| CN103014283A (en) * | 2012-12-26 | 2013-04-03 | 首钢总公司 | Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet |
| CN103993139A (en) * | 2014-06-13 | 2014-08-20 | 四川法拉特不锈钢铸造有限公司 | Method for enhancing impact toughness of quenched and tempered steel |
| CN104451375A (en) * | 2014-11-18 | 2015-03-25 | 南京钢铁股份有限公司 | Q235C super-thick steel plate having thickness of 160mm and low compression ratio and preparation method of steel plate |
| CN104745770A (en) * | 2015-03-23 | 2015-07-01 | 南京钢铁股份有限公司 | Heat treatment process capable of improving low temperature impact toughness of 9Ni steel |
| CN105132634A (en) * | 2015-09-21 | 2015-12-09 | 舞阳钢铁有限责任公司 | Quenching method of self-elevating ocean platform pile leg rack steel plate |
| CN105420468A (en) * | 2015-11-12 | 2016-03-23 | 内蒙古包钢钢联股份有限公司 | Heat treatment method for guaranteeing low-temperature toughness of thick high-strength steel |
| CN105648324A (en) * | 2016-01-16 | 2016-06-08 | 舞阳钢铁有限责任公司 | Large-thickness rack steel plate and production method thereof |
| CN106755864A (en) * | 2016-11-16 | 2017-05-31 | 南京钢铁股份有限公司 | A kind of method for improving special thickness superhigh intensity sea work steel surface low-temperature impact toughness |
| CN108914016A (en) * | 2018-08-10 | 2018-11-30 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of medium temperature faces hydrogen pressure steel plate for container and its manufacturing method |
| CN109266967A (en) * | 2018-11-06 | 2019-01-25 | 鞍钢股份有限公司 | A kind of quenched water power steel plate of ultralow compression ratio super thick and its production method |
| CN110106445A (en) * | 2019-06-05 | 2019-08-09 | 上海大学 | One kind is for ocean platform cast node high intensity high/low temperature toughness steel and preparation method thereof |
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| CN112375973A (en) * | 2020-10-26 | 2021-02-19 | 佛山科学技术学院 | High-strength steel structural member for building curtain wall engineering and heat treatment process thereof |
| CN114622073A (en) * | 2022-03-09 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for improving low-temperature impact toughness of boron-containing steel by using sub-temperature quenching |
| CN114645183A (en) * | 2022-03-26 | 2022-06-21 | 湖南华菱湘潭钢铁有限公司 | Production method of high-toughness low-yield-ratio low-alloy high-strength steel plate |
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- 2009-11-25 CN CN200910241508XA patent/CN101876001A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021304A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Heat processing technology for super-standard large-section pressure vessel tube plate |
| CN102125947A (en) * | 2010-12-21 | 2011-07-20 | 南阳汉冶特钢有限公司 | Method for flattening super-thick steel plates with temperature |
| CN102125947B (en) * | 2010-12-21 | 2013-05-22 | 南阳汉冶特钢有限公司 | Method for flattening super-thick steel plates with temperature |
| CN102615114A (en) * | 2012-03-30 | 2012-08-01 | 南京钢铁股份有限公司 | Method for temperature-controlling and rolling ribbon steel for chain manufacture |
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| CN103014283B (en) * | 2012-12-26 | 2014-05-28 | 首钢总公司 | Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet |
| CN103993139A (en) * | 2014-06-13 | 2014-08-20 | 四川法拉特不锈钢铸造有限公司 | Method for enhancing impact toughness of quenched and tempered steel |
| CN103993139B (en) * | 2014-06-13 | 2016-05-11 | 四川法拉特不锈钢铸造有限公司 | A kind of method that improves quenched and tempered steel impact flexibility |
| CN104451375A (en) * | 2014-11-18 | 2015-03-25 | 南京钢铁股份有限公司 | Q235C super-thick steel plate having thickness of 160mm and low compression ratio and preparation method of steel plate |
| CN104451375B (en) * | 2014-11-18 | 2016-08-17 | 南京钢铁股份有限公司 | A kind of 160mm thickness Q235C low compression ratio super-thick steel plate its preparation method |
| CN104745770A (en) * | 2015-03-23 | 2015-07-01 | 南京钢铁股份有限公司 | Heat treatment process capable of improving low temperature impact toughness of 9Ni steel |
| CN105132634A (en) * | 2015-09-21 | 2015-12-09 | 舞阳钢铁有限责任公司 | Quenching method of self-elevating ocean platform pile leg rack steel plate |
| CN105420468A (en) * | 2015-11-12 | 2016-03-23 | 内蒙古包钢钢联股份有限公司 | Heat treatment method for guaranteeing low-temperature toughness of thick high-strength steel |
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| CN112375973A (en) * | 2020-10-26 | 2021-02-19 | 佛山科学技术学院 | High-strength steel structural member for building curtain wall engineering and heat treatment process thereof |
| CN112375973B (en) * | 2020-10-26 | 2022-12-20 | 佛山科学技术学院 | High-strength steel structural member for building curtain wall engineering and heat treatment process thereof |
| WO2022222294A1 (en) * | 2021-04-19 | 2022-10-27 | 南京钢铁股份有限公司 | High-toughness quasi-sub-temperature quenched 09mnnidr container steel and preparation method therefor |
| CN114622073A (en) * | 2022-03-09 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Method for improving low-temperature impact toughness of boron-containing steel by using sub-temperature quenching |
| CN114622073B (en) * | 2022-03-09 | 2024-02-23 | 包头钢铁（集团）有限责任公司 | Method for improving low-temperature impact toughness of boron-containing steel by utilizing sub-temperature quenching |
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Application publication date: 20101103 |