CN101892428B - High-strength hot continuous rolling steel plate and production method thereof - Google Patents
High-strength hot continuous rolling steel plate and production method thereof Download PDFInfo
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- CN101892428B CN101892428B CN2010102288000A CN201010228800A CN101892428B CN 101892428 B CN101892428 B CN 101892428B CN 2010102288000 A CN2010102288000 A CN 2010102288000A CN 201010228800 A CN201010228800 A CN 201010228800A CN 101892428 B CN101892428 B CN 101892428B
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Abstract
The invention relates to the field of metal plate and strip production, in particular to a high-strength hot continuous rolling steel plate and a production method thereof. The invention aims to solve the technical problem of providing a high-strength hot continuous rolling steel plate which comprises the following components by weight: 0.05-0.10% of C, 0.10-0.35% of Si, 1.50-2.00% of Mn, 0-0.025% of P, 0-0.010% of S, 0.045-0.070% of Nb, 0.070-0.120% of Ti, 0.15-0.40% of Cr and the balance Fe and inevitable impurities. The hot continuous rolling steel plate dispenses with special cooling mode after being welded, the consistency of the weld joints and the base metal structures can be ensured under the conventional cooling condition and the performances of the weld joints and the heat affected areas can not be obviously changed.
Description
Technical field
The present invention relates to the metal plate and belt production field, particularly high-strength hot continuous rolling steel plate and working method thereof.
Background technology
Engineering machinery is one of ferrous materials that purposes is the widest in the strip product, usage quantity is maximum with hot-rolled steel sheet.Be mainly used in excavation machinery, earth moving machinery, crane tool, mining machinery, fork truck and industrial vehicle, concreting machinery etc.In recent years; Along with the construction machinery industry of China is in line with international standards; Performance and quality to steel products have proposed requirements at the higher level; Requirement of strength is increasingly high, all uses the High Strength Structural Steel more than the ys 600MPa to replace conventional general strength structure steel in a large number in fields such as mobile equipment such as freight container, engineering machinery, automobile and rail trucks.
In CN101165202A, disclose a kind of high-strength steel, wherein contained (weight percent) C:0.01～0.04%, Nb:0.015～0.060% with high welding heat influence area toughness; Ti:0.005～0.03%; Mo:0.2～0.5%, Cu:0.5～1.5%, Ni:0.1～1.0%; Cr:0.3～0.7%, and comprise in the working method and adopt the recrystallize and the Medium and Heavy Plate Rolling technology in two stages of crystallization not.Though the intensity of the high-strength steel of this invention meets the request for utilization of engineering machinery field, owing to introduced expensive metallic element such as Mo etc. at said high-strength steel grade, and also rolling technology is very complicated.At the disclosed copper boron of CN1218115 is low-carbon (LC) and ULCB high-strength steel; Its composition design is gone up and is adopted Ultra-low carbon and low-carbon (LC); Low amount boron and Nb+Ti+B combined microalloying mode; Utilize element such as copper boron to impel bainitic transformation, adopt low temperature to batch on the production technique, improve the intensity of steel plate through bainite structure.
Therefore, in the prior art, the operational path of 700MPa grade high-strength steel plate mainly contains two, and the one, adopt modifier treatment, but need heat-treatment production line, be mainly used in the production plate, general hot continuous rolling unit does not have heat-treatment production line.The 2nd, adopt the low-carbon bainite operational path, the coiling temperature that the needs of this operational path are lower is to having relatively high expectations of production line reeling machine ability.
Summary of the invention
First technical problem to be solved by this invention provides a kind of high-strength hot continuous rolling steel plate, and the composition of this high tensile hot rolled steel sheet is C:0.05～0.10% by weight percentage, Si:0.10～0.35%; Mn:1.50～2.00%, P:0～0.025%, S:0～0.010%; Nb:0.045～0.070%; Ti:0.070～0.120%, Cr:0.15～0.40%, all the other are Fe and inevitable impurity.
Preferably, the composition of said high tensile hot rolled steel sheet is C:0.05～0.08% by weight percentage, Si:0.10～0.35%; Mn:1.60～1.80%, P 0～0.025%, and S 0～0.010%; Nb:0.045～0.070%; Ti:0.070～0.120%, Cr:0.15～0.30%, all the other are Fe and inevitable impurity.
Further, said high tensile hot rolled steel sheet metallographic structure is ferritic and perlite.
Second technical problem to be solved by this invention provides the working method of above-mentioned high-strength hot continuous rolling steel plate, is specially: with converter smelting, continuous casting gained slab through heat tracing after roughing, Coil Box batch, finish rolling, laminar flow cooling and batch.Wherein Heating temperature is 1230～1260 ℃; The finish rolling temperature in is 980～1020 ℃, and the finish rolling finishing temperature is 850～890 ℃; The laminar flow cooling is cooled to 640～680 ℃ with the speed of cooling of 10～30 ℃/s.
The composition of said slab is C:0.05～0.08% by weight percentage, Si:0.10～0.35%, Mn:1.60～1.80%; P 0～0.025%; S 0～0.010%, Nb:0.045～0.070%, Ti:0.070～0.120%; Cr:0.15～0.30%, all the other are Fe and inevitable impurity.
The invention has the beneficial effects as follows:
Adopt the ys of the high-strength hot continuous rolling steel plate of the inventive method production to reach more than the 700MPa, tensile strength reaches more than the 770MPa, and unit elongation reaches more than 18%.
The metallographic structure of high-strength hot continuous rolling steel plate provided by the invention simultaneously is made up of ferritic and perlite; The hot-rolled steel sheet of this metallographic structure need not adopt the special type of cooling after welding; Under conventional cooling conditions; Just can guarantee the consistence of weld seam and mother metal tissue, weld seam and heat affected zone performance do not have tangible change.
The inventive method does not need heat-treatment production line, does not need low temperature to batch, and on the hot continuous rolling production line of routine, just can produce, and need not add expensive alloying elements such as Mo simultaneously, has reduced the production cost of enterprise.
Description of drawings
Fig. 1 is the metallographic structure figure of high-strength hot continuous rolling steel plate, and it is organized as ferritic+perlite.
Embodiment
Do further description in the face of the present invention down.
Behind conventional converter smelting, continuous casting, the chemical ingredients of Finished Steel is C:0.05～0.10% by weight percentage, Si:0.10～0.35%; Mn:1.50～2.00%, P:0～0.025%, S:0～0.010%; Nb:0.045～0.070%; Ti:0.070～0.120%, Cr:0.15～0.40%, all the other are Fe and inevitable impurity.
Continuous casting gained slab is heated to roughing after 1230～1260 ℃ of insulations, and according to the difference of finished product thickness, the thick slab of 200mm can fluctuate in the scope of 34～40mm through the thickness of the intermediate blank that obtains after the roughing.
Carry out Coil Box subsequently through the steel billet after the roughing and batch and make intermediate blank, realize that in Coil Box intermediate blank exchanges end to end, even to guarantee the elongated temperature of steel billet; It is bright and clean to guarantee steel billet plate face to remove the secondary oxidation iron sheet simultaneously.Said Coil Box can be transferred Coil Box for centreless.
The intermediate blank uncoiling that after Coil Box is batched, promptly is shifted gets into the finish rolling district and carries out finish rolling, adopts 6 frame finishing mill finish rolling; The finish rolling temperature in is 980～1020 ℃, and the thickness different according to finished product adopts different throwing frame modes; Finished product thickness is during less than 6mm, and finish rolling is thrown second, during finished product thickness 6～10mm; Finish rolling is thrown second and the 4th, and the finish rolling finishing temperature is 850～890 ℃.
Adopting laminar flow cooling to be cooled fast to 640～680 ℃ with 10～30 ℃/second speed of cooling after the finish rolling immediately batches.
Below through embodiment the present invention is done further detailed explanation.
Embodiment 1
Divide 5 batches of preparation high-strength hot continuous rolling steel plates, the slab of each batch (slab of conventional converter smelting, continuous casting) chemical ingredients is seen table 1.With continuous casting steel billet carry out successively respectively that slab heating, high-pressure water descaling, roughing, Coil Box are batched, finish rolling, laminar flow cooling and batch, thereby make hot continuous-milling steel plate.6 frame finishing mill finish rolling are adopted in finish rolling, and the thickness different according to finished product adopts different throwing frame modes, and finished product thickness is during less than 6mm, and finish rolling is thrown second, and during finished product thickness 6～10mm, finish rolling is thrown second and the 4th, and all the other processing parameters are as shown in table 2.The afterbody sampling of the coil of strip of the high-strength hot continuous rolling steel plate that makes, mechanical property is seen table 3.
Table 1
Table 2
| Sample | Slab heating temperature (℃) | Intermediate blank thickness (mm) | The finish rolling temperature in (℃) | Finishing temperature (℃) | Speed of cooling (℃/second) | Coiling temperature (℃) | The thickness of steel plate (mm) |
| 1 | 1249 | 40 | 1011 | 885 | 12 | 660 | 8.0 |
| 2 | 1235 | 38 | 980 | 870 | 15 | 650 | 7.5 |
| 3 | 1255 | 34 | 1008 | 875 | 25 | 648 | 3.8 |
| 4 | 1240 | 37 | 990 | 882 | 14 | 680 | 7.8 |
| 5 | 1246 | 38 | 1019 | 865 | 16 | 676 | 7.5 |
Table 3
| Sample | Ys (MPa) | Tensile strength (MPa) | Unit elongation (%) |
| 1 | 715 | 795 | 24.0 |
| 2 | 750 | 810 | 19.0 |
| 3 | 715 | 790 | 21.0 |
| 4 | 730 | 800 | 22.0 |
| 5 | 740 | 820 | 20.0 |
Claims (5)
1. high-strength hot continuous rolling steel plate is characterized in that: the slab composition is C:0.05～0.10%, Si:0.10～0.35% by weight percentage; Mn:1.50～2.00%, P 0～0.025%, and S 0～0.010%; Nb:0.045～0.070%; Ti:0.070～0.120%, Cr:0.15～0.40%, all the other are Fe and inevitable impurity;
With converter smelting, continuous casting gained slab reheat insulation back roughing, finish rolling, laminar flow cooling with batch; Wherein Heating temperature is 1230～1260 ℃; The finish rolling temperature in is 980～1020 ℃, and the finish rolling finishing temperature is 850～890 ℃; Laminar flow cooling is cooled to 640～680 ℃ with the speed of cooling of 10～30 ℃/s and promptly gets.
2. according to the said high-strength hot continuous rolling steel plate of claim 1, it is characterized in that: composition is C:0.05～0.08%, Si:0.10～0.35% by weight percentage; Mn:1.60～1.80%, P 0～0.025%, and S 0～0.010%; Nb:0.045～0.070%; Ti:0.070～0.120%, Cr:0.15～0.30%, all the other are Fe and inevitable impurity.
3. according to claim 1 or 2 said high-strength hot continuous rolling steel plates, it is characterized in that: said high tensile hot rolled steel sheet metallographic structure is ferritic and perlite.
4. the working method of high-strength hot continuous rolling steel plate is characterized in that: with converter smelting, continuous casting gained slab reheat insulation back roughing, finish rolling, laminar flow cooling with batch; Wherein Heating temperature is 1230～1260 ℃; The finish rolling temperature in is 980～1020 ℃, and the finish rolling finishing temperature is 850～890 ℃; The laminar flow cooling is cooled to 640～680 ℃ with the speed of cooling of 10～30 ℃/s; Said slab composition is C:0.05～0.10% by weight percentage, Si:0.10～0.35%, Mn:1.50～2.00%; P 0～0.025%; S 0～0.010%, Nb:0.045～0.070%, Ti:0.070～0.120%; Cr:0.15～0.40%, all the other are Fe and inevitable impurity.
5. the working method of high-strength hot continuous rolling steel plate according to claim 4, it is characterized in that: 6 frame finishing mill finish rolling are adopted in finish rolling, and finished product thickness is during less than 6mm, and finish rolling is thrown second, and during finished product thickness 6～10mm, finish rolling is thrown second and the 4th.
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| CN2010102288000A CN101892428B (en) | 2010-07-16 | 2010-07-16 | High-strength hot continuous rolling steel plate and production method thereof |
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| CN101892428B true CN101892428B (en) | 2012-02-08 |
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| CN102172634B (en) * | 2010-12-30 | 2012-12-12 | 攀钢集团钢铁钒钛股份有限公司 | Method for rolling welding line under automatic control |
| CN103042039B (en) * | 2013-01-05 | 2015-07-22 | 马钢(集团)控股有限公司 | Controlled rolling and cooling process for Cr-containing economic X70 pipeline hot-rolled steel coil plate |
| CN103060684B (en) * | 2013-01-08 | 2014-08-20 | 舞阳钢铁有限责任公司 | Production method of high-performance steel plate having thickness of 6mm |
| CN104060167A (en) * | 2014-06-18 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel sheet and production method thereof |
| CN104388830A (en) * | 2014-12-16 | 2015-03-04 | 常熟市东方特种金属材料厂 | High-strength iron-carbon alloy material |
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| CN100547103C (en) * | 2007-12-10 | 2009-10-07 | 华油钢管有限公司 | A kind of method for manufacturing high-strength X 80 steel spiral welded pipe |
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| JPH08143952A (en) * | 1994-11-21 | 1996-06-04 | Sumitomo Metal Ind Ltd | Production of high strength hot rolled steel plate excellent in workability, fatigue characteristic, and surface characteristic |
| JP4273906B2 (en) * | 2003-09-30 | 2009-06-03 | Ｊｆｅスチール株式会社 | Thick hot rolled steel sheet excellent in workability and ductility and method for producing the same |
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| CN100547103C (en) * | 2007-12-10 | 2009-10-07 | 华油钢管有限公司 | A kind of method for manufacturing high-strength X 80 steel spiral welded pipe |
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| JP特开2005-105340A 2005.04.21 |
| JP特开平8-143952A 1996.06.04 |
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