CN100419109C - Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel - Google Patents
Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel Download PDFInfo
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- CN100419109C CN100419109C CNB2005100476324A CN200510047632A CN100419109C CN 100419109 C CN100419109 C CN 100419109C CN B2005100476324 A CNB2005100476324 A CN B2005100476324A CN 200510047632 A CN200510047632 A CN 200510047632A CN 100419109 C CN100419109 C CN 100419109C
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Abstract
The present invention relates to a method for manufacturing low carbon 700MPa composite reinforced ultra-fine crystal grain strip steel, which is characterized in that the high strength steel comprises the chemical constitutions of the weight percent: 0.06 to 0.10% of C, at most 0.1% Si, 1.60 to 2.20% Mn, 0.05 to 0.07% of Nb, 0.05 to 0.07% of V, 0.05 to 0.07% of Ti, at most 0.01% of P, at most 0.01% of S and Fe as the rest. The present invention adopts the rolling and cooling control technology that steel billets are continuously cast and heated at the heating temperature of 1200 DEG C, the initial rough rolling temperature is 1150 DEG C, the finish rolling temperature is 1050 DEG C, and the rough rolling pass is 1 to 3; the initial fine rolling temperature is from 1000 to 950 DEG C, the finish fine rolling temperature is from 790 to 850 DEG C, the fine rolling pass is from 5 to 7, the rolling reduction of each pass is controlled to be between 20 and 30% on average, and water cooling is adopted among fine rolling machine frames; the cooling speed after rolling is from 30 to 60 DEG C/s, and the coiling temperature is from 450 to 600 DEG C. The metallurgical structure of the high strength strip steel of the present invention is mainly composed of ferrite of 2 to 4 micrometers and a small amount of bainite accounting for 10 to 20%. The high strength strip steel of the present invention has the advantages of favorable low temperature toughness or plasticity, simple technology and low production cost.
Description
Technical field
The present invention relates to a kind of preparation method of low carbon high-strength structure iron, be specifically related to a kind of manufacture method of producing low-carbon (LC) 700MPa grade composite strengthening ultrafine grain belt steel.
Background technology
Along with society and expanding economy, the pressure of the saving resource that Iron And Steel Industry faced, save energy, protection environment is increasing.Adopted when obtaining the steel grade of 700MPa intensity rank both at home and abroad at present is the thought of alloying more, and this has caused the increase of steel product cost, simultaneously the difficulty that increases the recycling that has also increased the steel later stages of alloying element.The scholars such as Yoshimasa FUNAKAWA of Japan have introduced in 1945～1951 pages of articles of delivering of 11 phases of ISIJ International in 2004 and have adopted interpolation Ti and Mo to obtain the method for high-strength steel.The carbide that is organized as distribution nano-scale on the ferrite matrix of this steel, when the atomicity ratio of Ti and Mo during in 1 left and right sides, the performance of steel is best, yield strength is more than 700MPa, have preferable performance, its steel product ingredient is: C 0.047%, and Si 0.22%, Mn1.59%, P 0.002%, and S 0.001%, and N 0.004%, Ti 0.082%, and Mo 0.20%.This studies show that to have only and add Ti and Mo simultaneously, and the yield strength of steel just can reach more than the 700MPa, has so just improved the cost of steel relatively, and the add-on of Mo element also has bigger influence to steel performance simultaneously, brings difficulty for the smelting of steel.
Summary of the invention
The objective of the invention is in order to overcome the defective that known technology exists, a kind of manufacture method of low-carbon (LC) 700MPa grade composite strengthening ultrafine grain belt steel is provided, be on the basis of carbon manganese structure iron composition, by adding microalloy element and adopting the controlled rolling and controlled cooling technology, the production yield strength is more than 700MPa, tensile strength is more than 780MPa, unit elongation is about 20%, the structural strip steel that has good use properties simultaneously, its metallographic structure is that grain-size is the ferrite of 2～4 μ m, the heterogeneous structure of 10～20% bainite; Its manufacturing process is simple, can reduce production costs significantly.
The technical scheme that realizes the object of the invention is: comprise the chemical composition of matching high-strength steel, the smelting of steel, continuous casting steel billet processing step, its main points are: the chemical composition of apolegamy high-strength steel, weight percent is: C0.06～0.10%, Si≤0.1%, Mn 1.60-2.20%, Nb 0.05～0.07%, V 0.05～0.07%, and Ti 0.05～0.07%, P＜0.01%, S＜0.01%, all the other are iron Fe; To continuous casting steel billet, carry out following cooling controlling and rolling controlling process system:
1) rolling technology: to the continuous casting steel billet heating, Heating temperature is 1200 ℃, carries out controlled rolling afterwards, and the roughing start rolling temperature is 1150 ℃, and the roughing finishing temperature is 1050 ℃, and it is rolling that the roughing process is carried out 1～3 passage; The finish rolling start rolling temperature is 1000-950 ℃, and the finish rolling finishing temperature is 790-850 ℃, and it is rolling that the finish rolling process is carried out 5～7 passages, adopts water-cooled between finishing stand;
2) roll postcooling technology: blank behind the rolling is carried out water cooling, and speed of cooling is 30-60 ℃/s, and coiling temperature is 450-600 ℃.
Above-mentioned continuous casting steel billet is through after the roughing, and middle sotck thinkness is 32～45mm, and final product thickness is 3～8mm; Every time draught of finish rolling process average is controlled at 20～30%.
To above-mentioned continuous casting material be in the austenite recrystallization district, non-recrystallization district and the controlled rolling of deformation induced phase change zone.By the austenite recrystallization controlled rolling of high-temperature zone, abundant refine austenite crystal grain; By water-cooled between the passage in finish rolling stage, reduce the rolled piece temperature, increase the distortion in austenite non-recrystallization district; The finish rolling finishing temperature is controlled at 790～850 ℃, makes the bigger accumulation strain of generation in the operation of rolling; By rolling batching of quick cooling in back and mild temperature, obtain the ferrite of ultra-fine 2～4 μ m and account for 10～20% bainite composition.
The present invention compared with the prior art has significant advantage and positively effect:
1), ultrafine grain belt steel of the present invention has the ferritic structure of super-refinement, makes material have higher yield strength, good plasticity, the low-temperature flexibility of the toughness, particularly material of material is greatly improved simultaneously.Introducing an amount of bainite in the tissue can effectively improve tensile strength, improves work hardening capacity, reduces yield tensile ratio, makes material when improving intensity, also has good formability.
2), since in the ultrafine grain belt steel of the present invention microalloy element content few, and production technique is simple, therefore can reduce production costs significantly.
3), high strength band steel of the present invention can reach following over-all properties: σ
s700-760MPa, σ
b780-840MPa, δ
5〉=18%.
Embodiment
Example 1: the chemical composition of apolegamy high-strength superfine ultra-fine crystal grain band steel, weight % ratio is: C 0.06%, and Si 0.10%, and Mn 2.20%, Nb 0.05%, V 0.07%, and Ti 0.07%, and P 0.003%, S 0.008%, all the other are iron Fe, the above-mentioned raw material for preparing has been smelted steel in 200 tons of converters, and continuous casting become the continuously cast bloom of 250mm * 1300mm * 10020mm, continuously cast bloom is heated to 1200 ℃, rolling on 2050 hot continuous mills, the roughing start rolling temperature is controlled to be 1150 ℃, and the roughing finishing temperature is controlled to be 1050 ℃, roughing 2 passages, intermediate blank is thick to be 40mm, after this intermediate blank is carried out finish rolling, and the finish rolling start rolling temperature is controlled to be 1000 ℃, the finish rolling finishing temperature is controlled to be 850 ℃, finish rolling 5 passages, average every time the draught of finish rolling is controlled at 30%, adopts water-cooled between finishing mill; Blank behind the rolling is carried out water cooling, and speed of cooling is 30 ℃/s, and coiling temperature is 600 ℃.Finally obtain low-carbon (LC) complex intensifying ultrafine grain belt steel product, product thickness is 5mm, and mechanical properties test result is: σ
s700MPa, σ
b780MPa, δ
519%, akv 123J/mm
2, clod wash, B=35, d=0.5a is qualified.
Example 2: the chemical composition of apolegamy high-strength superfine ultra-fine crystal grain band steel, weight % ratio is: C 0.10%, and Si 0.07%, and Mn 1.60%, and Nb 0.06%, and V 0.07%, and Ti 0.06%, and P 0.007%, and S 0.005%, and all the other are iron Fe; Roughing 1 passage, after the roughing base thick be 45mm, the finish rolling start rolling temperature is 970 ℃, the finish rolling finishing temperature is 806 ℃, it is rolling to carry out 7 passages, the average draught per pass of finish rolling is controlled at 20%, rolls postcooling, speed of cooling is 50 ℃/s, coiling temperature is 550 ℃.Other technological process and processing condition are with example 1.The thickness of the finished product is 8mm, and mechanical properties test result is: σ
s730MPa, σ
b830MPa, δ
518%, akv 130J/mm
2, clod wash, B=35, d=0.5a is qualified.
Example 3: the chemical composition of apolegamy high-strength superfine ultra-fine crystal grain band steel, weight % ratio is: C 0.06%, and Si 0.08%, and Mn 1.60%, and Nb 0.07%, and V 0.05%, and Ti 0.07%, and P 0.003%, and S 0.006%, and all the other are iron Fe; Roughing 3 passages, after the roughing base thick be 32mm, the finish rolling start rolling temperature is 950 ℃, the finish rolling finishing temperature is 790 ℃, it is rolling to carry out 6 passages; The average draught per pass of finish rolling is controlled at 25%, rolls postcooling, and speed of cooling is 60 ℃/s, and coiling temperature is 450 ℃.Other technological process is all identical with example 1 with processing condition.Final product thickness is 3mm, and mechanical properties test result is: σ
s720MPa, σ
b810MPa, δ
518%, akv 134J/mm
2, clod wash, B=35, d=0.5a is qualified.
Claims (2)
1. the manufacture method of a low-carbon (LC) 700MPa grade composite strengthening ultrafine grain belt steel comprises the chemical composition of matching high-strength steel, the smelting of steel, the continuous casting steel billet processing step is characterized in that matching the chemical composition of high-strength steel, and weight percent is: C 0.06～0.10%, Si≤0.1%, Mn 1.60-2.20%, Nb 0.05～0.07%, V0.05～0.07%, Ti 0.05～0.07%, P＜0.01%, S＜0.01%, surplus is Fe; To continuous casting steel billet, carry out following cooling controlling and rolling controlling process system:
1) rolling technology: to the continuous casting steel billet heating, Heating temperature is 1200 ℃, carries out controlled rolling afterwards, and the roughing start rolling temperature is 1150 ℃, and the roughing finishing temperature is 1050 ℃, and it is rolling that the roughing process is carried out 1～3 passage; The finish rolling start rolling temperature is 1000-950 ℃, and the finish rolling finishing temperature is 790-850 ℃, and it is rolling that the finish rolling process is carried out 5～7 passages, and every time draught of finish rolling process average is controlled at 20～30%, adopts water-cooled between finishing stand;
2) roll postcooling technology: blank behind the rolling is carried out water cooling, and speed of cooling is 30-60 ℃/s, and coiling temperature is 450-600 ℃.
2. according to the manufacture method of the described a kind of low-carbon (LC) 700MPa grade composite strengthening ultrafine grain belt steel of claim 1, it is characterized in that the interior thickness after the continuous casting material roughing is 32～45mm, final product thickness is 3～8mm.
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| CNB2005100476324A CN100419109C (en) | 2005-11-04 | 2005-11-04 | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel |
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| CNB2005100476324A CN100419109C (en) | 2005-11-04 | 2005-11-04 | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel |
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| CN100419109C true CN100419109C (en) | 2008-09-17 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100513592C (en) * | 2006-05-30 | 2009-07-15 | 江苏大学 | Method for preparing micro-alloy superfine crystal grain hot-rolled steel plate |
| CN101928880B (en) * | 2009-06-23 | 2012-05-30 | 上海梅山钢铁股份有限公司 | High-strength and high-tenacity steel for power communication poles and processing method thereof |
| CN102080191B (en) * | 2010-12-03 | 2012-07-11 | 北京科技大学 | Niobium-boron composite hot rolled high-strength container steel plate and preparation method thereof |
| CN102899562B (en) * | 2012-10-29 | 2014-08-27 | 首钢总公司 | Complex phase-type high-strength low-carbon bainitic medium and heavy steel plate and production method thereof |
| CN103014520A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof |
| CN103911547B (en) * | 2014-04-17 | 2016-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of v n micro alloying hot rolling bayesian strip body and production method thereof |
| CN103911548B (en) * | 2014-04-17 | 2016-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of low cost hot-rolled low carbon bayesian strip body and production method thereof |
| CN103911552B (en) * | 2014-04-17 | 2016-02-17 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of vanadium titanium microalloying hot rolling low-carbon bainite band steel and production method thereof |
| CN107151763B (en) * | 2017-05-27 | 2019-03-26 | 武汉钢铁有限公司 | Thin gauge is high-strength cold-formed to use hot rolled strip and its production method |
| CN109735766B (en) * | 2019-01-31 | 2019-11-12 | 东北大学 | A kind of gradient ultra-fine grained structure low-carbon micro steel-alloy and preparation method thereof |
| CN114871291A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of thin and wide Q960D/E grade high-flatness quenched and tempered steel plate |
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