CN104962814A - Normalized extra-thick plate with high strength and toughness and thickness of 150mm and method for manufacturing normalized extra-thick plate - Google Patents
Normalized extra-thick plate with high strength and toughness and thickness of 150mm and method for manufacturing normalized extra-thick plate Download PDFInfo
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Abstract
The invention discloses a normalized extra-thick plate with high strength and toughness and the thickness of 150mm and a method for manufacturing the normalized extra-thick plate, and belongs to the field of technologies for manufacturing extra-thick plates. The method mainly includes controlling technological parameters in steps of molten steel smelting, plate slab casting, steel plate rolling, steel plate normalizing treatment, cooling and the like. The normalized extra-thick plate and the method have the advantages that reasonable composition systems and optimized 'control-rolling, normalizing and weak water cooling' technologies are designed, accordingly, the steel plate is excellent in comprehensive mechanical property and good in impact toughness at the temperatures of minus 40 DEG C and minus 60 DEG C, different positions of the steel plate in the thickness direction are low and stable in mechanical property difference, requirements of Q460-level extra-thick steel plates with the thicknesses of 150mm on the strength and the impact toughness can be completely met, and the normalized extra-thick plate and the method have excellent application prospects in the field of steel for engineering structures.
Description
Technical field
The invention belongs to special heavy plate production technical field, particularly a kind of normalizing high-strong toughness 150mm special heavy plate and production method thereof.Particularly relate to a kind of 400mm thick continuously cast bloom production normalizing high-strong toughness 150mm special heavy plate and production method thereof.
Background technology
At home, generally the steel plate of thickness between " 20mm ~ 60mm " is called slab, and the steel plate of " thickness G reatT.GreaT.GT 60mm " is called special heavy plate.Very family is general for the purposes of special heavy plate, is mainly used in the aspect such as parts and bridge, machine support, weapons, mould, plate armour and building slab of ships, boiler, pressurized vessel, pressurizer, vapour generator, chemical reactive synthesis tower, heavy oil High Temperature High Pressure desulfurizer, hydroelectric turbine.Traditional high-intensity high-tenacity special heavy plate, adopt esr to add forging and process, production cost is relatively high.
Developing rapidly of continuous casting technology is a noticeable trend of contemporary development of iron & steel industry, it has larger Technological Economy superiority compared with casting with traditional ingot mold, advantages such as having simplification production process, improve the recovery rate of metal, improve working conditions, slab quality is good.With the sheet material that continuously cast bloom rolls into, lateral performance is better than die casting.Due to domestic plate blank material finite thickness, thickness of strand mostly is 180 ~ 250mm, and substance is less, and compression ratio is not high.
At present, in steel plate production process, TMCP technique is generally applied, and plays a positive role in pipe line steel, High Strength Structural Steel, offshore platform steel, the deck of boat etc. are produced, and substantially increases the comprehensive mechanical property of steel plate and has saved adding of expensive alloying elements.But adopt the steel plate that TMCP technique is produced, its mechanical property plastisied dispersion is larger.Therefore, for the special think gauge high-strong toughness steel plate of production, especially performance uniformity requires higher special heavy plate, and thermal treatment remains the important procedure of production high-performance and high added value steel plate, not only can improve the processing characteristics of steel plate, and significantly can improve the mechanical property of steel plate.Wherein, normalizing thermal treatment is the important process means improving steel plate toughness, improve steel plate tissue.
But the cooling after normalizing adopts air cooling mode usually, cause steel plate transformation temperature higher, ferrite crystal grain is thick, and the yield strength of steel plate reduces.By steel heat a certain temperature more than postcritical, after insulation for some time, tiny and uniform austenite structure can be obtained; Select the different types of cooling and speed of cooling to cool subsequently, the structure and properties obtained has very large difference.And obtain different metallographic structures and mechanical property, be the heat treated main purpose of steel plate.
Contrast patent 1 (publication number: CN 103233160 A), a kind of yield strength 460MPa level normalizing container steel and manufacture method thereof, adopt the alloy designs such as conventional C, Mn, Nb, common rolling technology and normal normalizing heat treatment technique, produce thickness specification and be only 12mm ~ 30mm, steel plate specification is thinner, cannot meet the service requirements of special heavy plate.
Contrast patent 2 (publication number: CN 101319270A), a kind of heat treating method improving normalized steel plate, adopt normalizing+water-cooling pattern, produce 60mm and following specification tensile strength 550MPa level Nb microalloying steel plate, equally, involved steel plate specification is thinner, still cannot meet the service requirements of special heavy plate; For thin specification steel plate, adding water cooling after normalizing, there is certain hidden danger in plate surface quality.
Qinhuangdao Shou Qin metallic substance company (hereinafter referred to as " Shou Qin company ") has domestic thicker 400mm Plate production, can produce the comparatively large and thick steel billet that internal soundness is excellent of substance.At special heavy plate production field, there is certain equipment advantage; Shou Qin company has more advanced 4300mm Heavy Plate Production line simultaneously.In cooling system, is furnished with the Tempering and Quenching production line of German LOI company designs.
The present invention is in conjunction with the existing tooling device of Shou Qin company and strict technical process control, use 400mm think gauge slab, successfully develop 150mm normalized high-strength, high-toughness ultra-thick plate, intensity rank reaches Q460, and quality grade can reach F level (-60 DEG C).
Summary of the invention
The object of the present invention is to provide a kind of normalizing high-strong toughness 150mm special heavy plate and production method thereof, by rational design of alloy, strict controlled rolling and controlled cooling, normalizing+water-cooling process, undercapacity problem after poor, the normal normalizing of solution special heavy plate low-temperature impact.
A kind of normalizing high-strong toughness 150mm special heavy plate, its chemical composition is (weight percent), C:0.14% ~ 0.19%; Si:0.20% ~ 0.50%; Mn:1.40% ~ 1.70%; Ni:0.30% ~ 0.40%; Cu:0.10% ~ 0.30%; Nb:0.035% ~ 0.050%; V:0.030% ~ 0.050%; Ti:0.010% ~ 0.020%; Alt:0.015% ~ 0.050%; P :≤0.015%; S :≤0.0050%; Carbon equivalent Ceq (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni/+Cu)/15, and Ceq (%) scope: 0.41% ~ 0.53%; All the other are Fe and inevitable impurity.
A production method for normalizing high-strong toughness 150mm special heavy plate, concrete steps are: desulfurizing iron skims → converter smelting → LF stove refining → RH vacuum-treat → slab casting → heating steel billet → steel plate rolling → steel plate stacking slow cooling → normalizing treatment → normalizing after weak water-cooled → sampling, sample preparation and mechanical properties test.Processing parameter involved in the present invention is as follows:
1, in smelting molten steel process, according to present component area requirement, under the prerequisite ensureing C content scope, add alloying element Mn, Ni, Cu and microalloy element Nb, V, Ti, and strict control impurity element P, S content is P :≤0.015%, S :≤0.0050%.
2, slab casting cycle adopts permanent pulling rate operating procedure, and pulling rate scope is 0.50 ~ 0.80m/min, ensures center segregation of casting blank C class≤1.0; By strict Composition Control, utilize 400mm slab liquid filling machine, to be produced into point rationally, the thick continuously cast bloom of 400mm that internal soundness is good, for 150mm special heavy plate rolling lay the foundation.
3, steel plate rolling process adopts cooling controlling and rolling controlling process, and roughing end temp is 980 ~ 1050 DEG C, treats that temperature thickness is steel plate thickness+50 ~ 60mm; Entrance finishing temperature is 830 ~ 850 DEG C, and end temp is 780 ~ 800 DEG C.
4, after steel plate rolling, carry out stacking slow cooling, the temperature of stacking slow cooling is 500 DEG C ~ 600 DEG C, and the time of stacking slow cooling is 72h ~ 96h.
5, in steel plate normalizing treatment process, arranging normalizing temperature is 850 ~ 890 DEG C; Total time inside furnace of normalizing treatment process light plate is process furnace coefficient × steel plate thickness+soaking time, and soaking time is 10 ~ 20min.Concrete normalizing temperature and process furnace coefficient vs figure are shown in shown in accompanying drawing 1.
6, after steel plate normalizing treatment, adopt the technique of weak water-cooled to cool, ensure that final cooling temperature is 600 ~ 700 DEG C; In process of cooling, steel plate gait of march, namely roller speed is 20 ~ 25m/min; Design weak water cooling equipment totally 20 groups of water nozzles, wherein, 1 ~ 14 group of water nozzle is high pressure section, and 15 ~ 20 groups of water nozzles are low pressure section, 1st, 2,3,7,8,9,13,15,17 and 19 groups of water nozzles are upper water nozzle, and the 4th, 5,6,10,11,12,14,16,18 and 20 group of water nozzle is lower water nozzle; For ensureing weak water-cooled effect, use 7 ~ 20 groups of water nozzles, and the water yield arranging 7 ~ 20 groups of water nozzles is respectively 60 ± 5L, 170 ± 10L, 60 ± 10L, 90 ± 5L, 320 ± 10L, 90 ± 10L, 200 ± 10L, 400 ± 10L, 400 ± 10L, 500 ± 10L, 500 ± 10L, 800 ± 10L, 1000 ± 10L and 1000 ± 10L, high pressure area total Water is 1390 ± 80L, the upper and lower water nozzle water ratio in high pressure area is: 0.48 ~ 0.62, low pressure area total Water is 3200 ± 60L, and the upper and lower water nozzle water ratio in low pressure area is: 0.48 ~ 0.52.Weak water-cooling process is added by above-mentioned normalizing, can crystal grain thinning, improve intensity and the toughness of steel plate.
By above technical process, the 150mm special heavy plate produced, stable mechanical property and thickness directional properties are relatively more even, have good intensity, plasticity, toughness, can reach the performance requriements of Q460 grade high-strength degree structural slab completely, quality grade can reach F level.Wherein, the nearly surface of steel plate, steel plate thickness 1/4 place and steel plate thickness 1/2 place mechanical property are shown in Table 1: the main microtexture in the nearly surface of steel plate is the ferrite of fine uniform, the main microtexture in steel plate thickness direction 1/4 place is ferrite+perlite mixed structure, steel plate thickness direction 1/2 place microtexture is still for being ferrite+perlite mixed structure, content of pearlite in alloy increases, and ferritic structure is alligatoring slightly.
Table 1 steel plate different positions mechanical property scope
| Sample position | ReL/MPa | Rm/MPa | A/％ | -40℃AKv/J | -60℃AKv/J |
| Steel plate is closely surperficial | ＞460～530 | ＞580～650 | ＞18～30 | ＞150～250 | ＞80～150 |
| Steel plate thickness 1/4 place | ＞415～485 | ＞550～620 | ＞18～30 | ＞120～200 | ＞70～120 |
| Steel plate thickness 1/2 place | ＞400～470 | ＞550～620 | ＞18～30 | ＞60～150 | ＞40～80 |
Note: ReL (lower yield strength), Rm (tensile strength), A (elongation after fracture), AKv (impact)
The invention has the advantages that: by designing suitable component system, C, a certain amount of Ni and Cu in employing, a small amount of microalloy element Nb, V, Ti, adopt the thick continuously cast bloom of 400mm, by " controlled rolling+normalizing+weak water-cooled " technique, 150mm intensity high-toughness ultra-thick plate with a high standard is produced in success, its comprehensive mechanical property is excellent, steel plate thickness direction different positions mechanical property difference is little and stable,-40 DEG C and-60 DEG C of impelling strength good, meet Q460 rank 150mm super-thick steel plate completely to the requirement of intensity, impelling strength; Different positions microtexture is even;
In Kind of Steels Used in Engineering Structures field, there is good application prospect.
Accompanying drawing explanation
Fig. 1 normalizing temperature and process furnace coefficient vs relation.
Fig. 2 is the nearly surface microscopic tissue of embodiment 150mm specification steel plate.
Fig. 3 is embodiment 150mm specification steel plate thickness 1/4 place microtexture.
Fig. 4 is embodiment 150mm specification steel plate thickness 1/2 place microtexture.
Embodiment
Embodiment 1
A kind of normalizing high-strong toughness 150mm special heavy plate, complete that steel billet is smelted at Shou Qin company 4300mm Heavy Plate Rolling Line, slab casting (slab specification--thickness × width × length: 400mm × 2400mm × 4100mm), steel plate rolling (rolling specs--thickness × width: 150mm × 2500mm × 10000mm) and normalizing+weak water-cooled process.
Its chemical composition (wt%) is as shown in table 2:
Table 2 steel billet chemical composition (wt%)
| C | Si | Mn | P | S | Alt | Ni | Cu | V | Nb | Ti | CEQ |
| 0.18 | 0.33 | 1.55 | 0.010 | 0.003 | 0.032 | 0.32 | 0.20 | 0.048 | 0.042 | 0.016 | 0.48 |
In slab casting engineering, pulling rate model is 0.75m/min, center segregation of casting blank C class 0.5.
Rolling technological parameter setting and thermal treatment process control process parameter are in table 3 and table 4.In normalizing treatment process, normalizing temperature 880 DEG C, according to the relation of normalizing temperature and heating coefficient, heating coefficient is 1.567, total time inside furnace=150mm*1.567min/mm+15min ≈ 250min in normalizing process.For the temperature after ensureing weak water-cooled meets the demands, each water nozzle water yield in reasonable disposition high and low pressure area and roller table speed, roller table speed is 20m/min.
Table 3 rolling technological parameter is arranged
Note: thickness unit-mm; Temperature unit-DEG C, time m-h
Table 4 heat treatment process parameter is arranged
Note: temperature unit-DEG C; High and low pressure area water yield unit-L, time m-h, roller speed-m/min
Mechanical property of steel plate is as shown in table 5:
Table 5 embodiment mechanical property of steel plate
Note: 0534+S, represents the nearly surface property of steel plate; 0534+Q, represents steel plate thickness of slab 1/4 place performance; 0534-C, represents steel plate thickness of slab 1/2 place performance; ReL (lower yield strength), Rm (tensile strength), A (elongation after fracture), AKv (impact)
Above example is only the simple description to best mode for carrying out the invention, does not have any restriction to scope of the present invention.
Claims (3)
1. a normalizing high-strong toughness 150mm special heavy plate, is characterized in that, chemical composition is by weight percentage, C:0.14% ~ 0.19%; Si:0.20% ~ 0.50%; Mn:1.40% ~ 1.70%; Ni:0.30% ~ 0.40%; Cu:0.10% ~ 0.30%; Nb:0.035% ~ 0.050%; V:0.030% ~ 0.050%; Ti:0.010% ~ 0.020%; Alt:0.015% ~ 0.050%; P :≤0.015%; S :≤0.0050%; Carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni/+Cu)/15:0.41% ~ 0.53%; All the other are Fe and inevitable impurity.
2. a production method for special heavy plate according to claim 1, concrete steps are: desulfurizing iron skims → converter smelting → LF stove refining → RH vacuum-treat → slab casting → heating steel billet → steel plate rolling → steel plate stacking slow cooling → normalizing treatment → normalizing after weak water-cooled → sampling, sample preparation and mechanical properties test; It is characterized in that,
Processing step parameter is as follows:
1) smelting molten steel: add alloying element Mn, Ni, Cu and microalloy element Nb, V, Ti, and to control impurity element P, S content be P :≤0.015%, S :≤0.0050%;
2) slab casting: adopt permanent pulling rate operating procedure, pulling rate scope is 0.50 ~ 0.80m/min, ensures center segregation of casting blank C class≤1.0;
3) steel plate rolling: adopt cooling controlling and rolling controlling process, roughing end temp is 980 ~ 1050 DEG C, treats that temperature thickness is steel plate thickness+50 ~ 60mm; Entrance finishing temperature is 830 ~ 850 DEG C, and end temp is 780 ~ 800 DEG C;
4) stacking slow cooling: the temperature arranging stacking slow cooling is 500 DEG C ~ 600 DEG C, and the time of stacking slow cooling is 72h ~ 96h;
5) steel plate normalizing treatment: arranging normalizing temperature is 850 ~ 890 DEG C; Total time inside furnace of normalizing treatment process light plate is process furnace coefficient × steel plate thickness+soaking time, and soaking time is 10 ~ 20min;
6) cool: adopt the technique of weak water-cooled to cool, ensure that final cooling temperature is 600 ~ 700 DEG C; In process of cooling, steel plate gait of march, namely roller speed is 20 ~ 25m/min.
3. method according to claim 2, it is characterized in that, step 6) described in the technique of weak water-cooled be: design weak water cooling equipment totally 20 groups of water nozzles, wherein, 1 ~ 14 group of water nozzle is high pressure section, 15 ~ 20 groups of water nozzles are low pressure section, and the 1st, 2,3,7,8,9,13,15,17 and 19 group of water nozzle is upper water nozzle, and the 4th, 5,6,10,11,12,14,16,18 and 20 group of water nozzle is lower water nozzle; For ensureing weak water-cooled effect, use 7 ~ 20 groups of water nozzles, and the water yield arranging 7 ~ 20 groups of water nozzles is respectively 60 ± 5L, 170 ± 10L, 60 ± 10L, 90 ± 5L, 320 ± 10L, 90 ± 10L, 200 ± 10L, 400 ± 10L, 400 ± 10L, 500 ± 10L, 500 ± 10L, 800 ± 10L, 1000 ± 10L and 1000 ± 10L, high pressure area total Water is 1390 ± 80L, the upper and lower water nozzle water ratio in high pressure area is: 0.48 ~ 0.62, low pressure area total Water is 3200 ± 60L, and the upper and lower water nozzle water ratio in low pressure area is: 0.48 ~ 0.52.
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| CN106399646A (en) * | 2016-12-12 | 2017-02-15 | 南京钢铁股份有限公司 | Quenching technology of F-grade extra-thick plate for ultrahigh-strength ocean engineering |
| CN107937811A (en) * | 2017-08-16 | 2018-04-20 | 新疆八钢铁股份有限公司 | Low temperature resistant 410MPa grades of steel plate for tall building of normalizing state |
| CN108754321A (en) * | 2018-06-11 | 2018-11-06 | 鞍钢股份有限公司 | A kind of special thick normalized high-strength steel plate of pressure vessel and its production method |
| CN113151734A (en) * | 2021-01-04 | 2021-07-23 | 南京钢铁股份有限公司 | S460 high-strength low-temperature structural steel and normalizing rolling preparation method thereof |
| CN113249642A (en) * | 2021-03-22 | 2021-08-13 | 江阴兴澄特种钢铁有限公司 | Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method thereof |
| CN114686765A (en) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
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Cited By (9)
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| CN106399646A (en) * | 2016-12-12 | 2017-02-15 | 南京钢铁股份有限公司 | Quenching technology of F-grade extra-thick plate for ultrahigh-strength ocean engineering |
| CN107937811A (en) * | 2017-08-16 | 2018-04-20 | 新疆八钢铁股份有限公司 | Low temperature resistant 410MPa grades of steel plate for tall building of normalizing state |
| CN108754321A (en) * | 2018-06-11 | 2018-11-06 | 鞍钢股份有限公司 | A kind of special thick normalized high-strength steel plate of pressure vessel and its production method |
| CN108754321B (en) * | 2018-06-11 | 2020-04-24 | 鞍钢股份有限公司 | Super-thick normalized high-strength pressure vessel steel plate and production method thereof |
| CN113151734A (en) * | 2021-01-04 | 2021-07-23 | 南京钢铁股份有限公司 | S460 high-strength low-temperature structural steel and normalizing rolling preparation method thereof |
| CN113249642A (en) * | 2021-03-22 | 2021-08-13 | 江阴兴澄特种钢铁有限公司 | Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method thereof |
| CN113249642B (en) * | 2021-03-22 | 2023-03-07 | 江阴兴澄特种钢铁有限公司 | Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method thereof |
| CN114686765A (en) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
| CN114686765B (en) * | 2022-03-31 | 2023-03-03 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
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Effective date of registration: 20190327 Address after: Iron and Steel Power Park of Caofeidian Industrial Zone, Tangshan City, Hebei Province Patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Address before: Duzhuang Township, Funing County, Qinhuangdao City, Hebei Province Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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Inventor after: Zhou Deguang Inventor after: Liu Yinliang Inventor after: Yan Zhiping Inventor after: Liu Hailong Inventor after: Song Xin Inventor after: Zhao Jiuliang Inventor after: Feng Lulu Inventor after: Jian Tieqiang Inventor after: Huang Shaoshuai Inventor after: Yang Chunwei Inventor after: Song Zengqiang Inventor after: Bai Songlian Inventor after: Wang Genji Inventor after: Bai Xuejun Inventor before: Song Xin Inventor before: Liu Yinliang Inventor before: Yan Zhiping Inventor before: Liu Hailong Inventor before: Zhou Deguang Inventor before: Zhao Jiuliang Inventor before: Feng Lulu Inventor before: Jian Tieqiang Inventor before: Huang Shaoshuai Inventor before: Yang Chunwei Inventor before: Song Zengqiang Inventor before: Bai Songlian Inventor before: Wang Genji Inventor before: Bai Xuejun |
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