CN102286701A - Thick plate for ultra-high-intensity boat body structure and production method thereof - Google Patents
Thick plate for ultra-high-intensity boat body structure and production method thereof Download PDFInfo
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Abstract
The invention discloses a thick plate for an ultra-high-intensity boat body structure, which comprises the following chemical ingredients in mass percentage: 0.05 to 0.10 percent of C, 0.1 to 0.55 percent of Si, 1.0 to 1.6 percent of Mn, 0.02 to 0.05 percent of Nb, 0.007 to 0.02 percent of Ti, 0.020 to 0.050 percent of Als and the balance Fe and unavoidable impurities, wherein in the unavoidable impurities, P is less than 0.015 percent, S is less than 0.005 percent, O is less than 0.0020 percent, N is less than 0.0045 percent, and H is less than 0.0002 percent. The thick plate for the ultra-high-intensity boat body structure is produced through low-carbon, low-phosphor ultra-low-sulphur and thermo-mechanical control process (TMCP) process under the 3500 steckel mill condition, and the thick plate has good integrated performance and good cold bending performance and belongs to high-quality steel for the boat body structure.
Description
Technical field
The invention belongs to the Hi-Stren steel production field, specifically a kind of TMCP type superstrength ship hull structure use slab and production method thereof based on Steckel mill.
Background technology
Along with the development of boats and ships to maximization, lightness direction, and the progress of marine technology, shipbuilding industry exists potential great demand to high-quality ship hull structure use steel, and simultaneously the production status of ship hull structure use steel is compared with this demand trend and shown many gaps.
From the condition of production of ship hull structure use steel kind, present domestic ship plate regular size is 10-32mm * 1400-3500mm * 6000-12000mm.Kind more than 60% is A, B regular tenacity level, and high-strength steel all has application from AH32 to FH40, but the ratio maximum be still the AH rank.For the steel plate of some wide thin specifications, more than the wide 3000mm of thick 6-10mm, the wide thin plate of 8～12mm, the special thick deck of boat (65～90mm plate) mainly solve by import.E level, some breach of the F grade high-strength deck of boat.
36 and the deck of boat base steel of following intensity rank this be ferrite+pearlitic structure, thisly be organized in that intensity can be improved in certain cooling range, toughness improves, but raising and improvement are limited.Therefore, developing the steel of other types of organization, is the important channel that obtains the good steel of comprehensive mechanical property.Achievement in research shows that although upper bainite has higher intensity, its impelling strength and welding property are relatively poor both at home and abroad in recent years.Continuous development along with smelting technology, find that little carbon low alloy steel of producing not only has higher intensity, simultaneously have lower impact transition temperature, good welding property again, and these good comprehensive mechanical performances can obtain under the controlled rolling and controlled cooling state.
The microstructure characteristic of acicular ferrite uniqueness has also determined it to have the performance that is different from common microtexture.Most research about soft steel thinks that influencing the principal element of performance is effective grain-size.Effective grain-size of acicular ferrite is its needle-like lath.Tiny needle-like slip bundle, high density dislocation and the disperse of interlock are separated out and are equated that microstructure characteristic has vital role to the obdurability that improves material each other in the acicular ferrite structure.In acicular ferrite, crack propagation must be subjected to interlock each other consumingly, the obstruction of the tiny acicular ferrite bar bundle of the distribution that intermeshes, thereby has improved its obdurability effectively.The carbonitride that simultaneously tiny M/A island and disperse distribute is not enough to constitute crackle critical size, not easy excitated crackle.Studies show that crackle runs into the M/A island and the carbonitride precipitate is usually transferred, show strong retardation, and the residual austenite in the M/A island is a kind of favourable toughness phase, can reduce crack tip stress, consume part and expand merit crackle.Thereby acicular ferrite structure has good obdurability, is the ideal tissue of exploitation superstrength ship hull structure use steel.
Summary of the invention
The insufficient problem of complex manufacturing, toughness and tenacity that exists for the deck of boat steel that solves existing ferrite+pearlitic structure.The object of the present invention is to provide a kind of superstrength ship hull structure use slab and production method thereof, this slab adopts Nb, Ti microalloy composition, obtains good combination property on Steckel mill by the TMCP production technique.
The objective of the invention is to be achieved through the following technical solutions:
A kind of superstrength ship hull structure use slab, it is characterized in that: this slab chemical ingredients mass percent is: C: 0.05-0.10%, Si:0.1-0.55%, Mn: 1.0-1.6%, Nb:0.02-0.05%, Ti:0.007-0.02%, Als:0.020-0.050%, surplus is Fe and inevitable impurity; Wherein, P＜0.015% in the inevitable impurity, S＜0.005%, O＜0.0020%, N＜0.0045%, H＜0.0002%.
Among the present invention, one or more under this slab chemical ingredients also comprises in the element:: Mo:0.10-0.30%, Cr:0.10-0.30%, Ni:0.10-0.50%, Cu:0.20-0.35%.
This slab chemical ingredients mass percent is preferably: C:0.06%, and Si:0.20%, Mn:1.5%, P:0.009%, S:0.002%, Als:0.03%, Nb:0.027%, Ti:0.015%, Cr+Mo+Ni+Cu=0.95, all the other are Fe and inevitable impurity.
Among the present invention, the upper content limit of harmful element is controlled at P＜0.015% in the steel, S＜0.005%, O＜0.0020%, N＜0.0045%, H＜0.0002%.
A kind of production method of superstrength ship hull structure use slab is characterized in that: this method adopts sheet billet continuous casting on Steckel mill, and TMCP technology is produced, and concrete processing step is as follows:
1) molten steel casting is become 150-220mm satisfy the heavy slab that chemical ingredients requires; Roll the luggage stove heating of advancing, the process furnace tapping temperature is 1150-1230 ℃, heat-up time 10-13min/cm * slab thickness cm; Wherein, the chemical ingredients mass percent of heavy slab is: C: 0.05-0.10%, and Si:0.1-0.55%, Mn: 1.0-1.6%, Nb:0.02-0.05%, Ti:0.007-0.02%, Als:0.020-0.050%, surplus is Fe and inevitable impurity; Wherein, P＜0.015% in the inevitable impurity, S＜0.005%, O＜0.0020%, N＜0.0045%, H＜0.0002%.
2) in the roughing operation, start rolling temperature is 1100-1150 ℃, roughing finishing temperature 〉=1040 ℃; Intermediate blank treats that temperature thickness is finished product thickness 2.0-4.0 times;
3) adopt the ACC refrigerating unit to cool off, make its surface temperature within 20-30s, be cooled fast to 860-880 ℃, treat that then temperature makes its equalizing temperature being in the intermediate blank for the treatment of temperature state;
4) finish rolling start rolling temperature≤880 ℃, finish rolling finishing temperature≤830 ℃;
5) it is cold to enter ACC control after the finish rolling fast, cooling rate 8-15 ℃/s;
6) return red temperature: 450-600 ℃; Obtain superstrength ship hull structure use slab.
The present invention under 3500 Steckel mill conditions, by low-carbon (LC), low-phosphorous and utmost point low-sulfur and TMCP technology, successful production the F460 grade super strength deck of boat.
The slab product that the present invention produces possesses good comprehensive performances: mechanical property R
EH460a, R
m570Pa, cross direction elongation A〉18% ,-60 ℃ of summers are than impact absorbing energy horizontal stroke, vertical value〉46J, Z is to the stretching relative reduction in area〉35%, cold-bending property is good, is a kind of high-quality ship hull structure use steel.
Description of drawings
Fig. 1 is the metallographic structure figure at this enforcement ga(u)ge of plate direction 1/4 place.
Embodiment
A kind of superstrength ship hull structure use slab of the present invention, She Ji composition is by weight percentage: C:0.06%, Si:0.20%, Mn:1.5%, P:0.009%, S:0.002%, Als:0.03%, Nb:0.027%, Ti:0.015%, Cr+Mo+Ni+Cu=0.95, all the other are Fe and inevitable impurity.
Under 3500 Steckel mill conditions, adopt sheet billet continuous casting, TMCP technology is produced, and the concrete technological measure of production method is as follows:
The production process aspect comprises smelting, heating, roughing, finish rolling, ACC operation.
Smelt and be cast into the 220mm heavy slab by above composition; Slab is sent into process furnace, 1200 ℃ of process furnace tapping temperatures, heat-up time 232min; The roughing start rolling temperature is 1150 ℃, 1046 ℃ of roughing finishing temperatures; Intermediate blank is treated temperature thickness 90mm; 860 ℃ of finish rolling start rolling temperatures, 830 ℃ of finish rolling finishing temperatures; It is cold to enter the ACC control after the finish rolling fast, 12 ℃/s of cooling rate; Return 580 ℃ of red temperature, product thickness 40mm.
The present invention is by low-carbon (LC), low-phosphorous and utmost point low-sulfur and TMCP technology, successful production the F460 grade super strength deck of boat.Fig. 1 is the metallographic structure figure at thickness direction 1/4 place of present embodiment, and steel plate 1/4 place metallographic structure is that B+PF+P forms as seen from the figure.The R of product
EH=495MPa, R
m=625MPa, cross direction elongation A=21.5% ,-60 ℃ of summers reach more than the 200J than impact absorbing energy horizontal stroke, vertical value, and all more than 35%, cold-bending property is good to the stretching relative reduction in area for Z, is a kind of high-quality ship hull structure use steel.
Claims (5)
1. superstrength ship hull structure use slab, it is characterized in that: this slab chemical ingredients mass percent is: C: 0.05-0.10%, Si:0.1-0.55%, Mn: 1.0-1.6%, Nb:0.02-0.05%, Ti:0.007-0.02%, Als:0.020-0.050%, surplus is Fe and inevitable impurity; Wherein, P＜0.015% in the inevitable impurity, S＜0.005%, O＜0.0020%, N＜0.0045%, H＜0.0002%.
2. superstrength ship hull structure use slab according to claim 1, it is characterized in that: this slab chemical ingredients also comprises one or more in the following element: Mo:0.10-0.30%, Cr:0.10-0.30%, Ni:0.10-0.50%, Cu:0.20-0.35%.
3. superstrength ship hull structure use slab according to claim 1, it is characterized in that: this slab chemical ingredients mass percent is: C:0.06%, Si:0.20%, Mn:1.5%, P:0.009%, S:0.002%, Als:0.03%, Nb:0.027%, Ti:0.015%, Cr+Mo+Ni+Cu=0.95, all the other are Fe and inevitable impurity.
4. the production method of the described superstrength ship hull structure use of claim 1 slab, it is characterized in that: this method adopts sheet billet continuous casting on Steckel mill, and TMCP technology is produced, and concrete processing step is as follows:
1) molten steel casting is become 150-220mm satisfy the heavy slab that chemical ingredients requires; Roll the luggage stove heating of advancing, the process furnace tapping temperature is 1150-1230 ℃, heat-up time 10-13min/cm * slab thickness cm;
2) in the roughing operation, start rolling temperature is 1100-1150 ℃, roughing finishing temperature 〉=1040 ℃; Intermediate blank treats that temperature thickness is finished product thickness 2.0-4.0 times;
3) adopt the ACC refrigerating unit to cool off, make its surface temperature within 20-30s, be cooled fast to 860-880 ℃, treat that then temperature makes its equalizing temperature being in the intermediate blank for the treatment of temperature state;
4) finish rolling start rolling temperature≤880 ℃, finish rolling finishing temperature≤830 ℃;
5) it is cold to enter ACC control after the finish rolling fast, cooling rate 8-15 ℃/s;
6) return red temperature: 450-600 ℃; Obtain superstrength ship hull structure use slab.
5. the production method of superstrength ship hull structure use slab according to claim 4, it is characterized in that: in the step 1), the chemical ingredients mass percent of heavy slab is: C: 0.05-0.10%, Si:0.1-0.55%, Mn: 1.0-1.6%, Nb:0.02-0.05%, Ti:0.007-0.02%, Als:0.020-0.050%, surplus is Fe and inevitable impurity; Wherein, P＜0.015% in the inevitable impurity, S＜0.005%, O＜0.0020%, N＜0.0045%, H＜0.0002%.
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| CN103882297A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | 390 MPa class low-temperature hull steel having excellent toughness and manufacturing method thereof |
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Application publication date: 20111221 |