CN101514424A - TMCP ocean structure thick plate and method for manufacturing same - Google Patents
TMCP ocean structure thick plate and method for manufacturing same Download PDFInfo
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Abstract
The invention provides a TMCP ocean structure thick plate and a method for manufacturing the same. The thick plate comprises the following chemical components: 0.015 to 0.18 weight percent of C, 0.5 to 2.0 weight percent of Mn, less than or equal to 0.6 weight percent of Si, less than or equal to 0.003 weight percent of S, less than or equal to 0.015 weight percent of P, 0.015 to 0.120 weight percent of Nb, 0.00 5 to 0.030 weight percent of Ti, less than or equal to 0.060 weight percent of Al, less than or equal to 0.010 weight percent of Ca, 0.003 to 0.010 weight percent of N, 0.001 to 0.006 weight percent of O, and the balance of Fe and inevitable impurities. The micro alloying design and TMCP rolling process control ensure the thick plate has a less than 120 J low-temperature impact toughness at a temperature of between 20 DEG C below zero and 40 DEG C below zero. Moreover, the thick plate has good welding performance and can be widely used for manufacturing D40 and E40 hull structures and ocean platforms.
Description
Technical field
The present invention relates to field of iron and steel, specifically, the present invention relates to the ocean structure slab, more particularly, the present invention relates to a kind of TMCP type ocean structure slab and manufacture method thereof.
Background technology
Along with the development of shipbuilding industry, also more and more higher to deck of boat performance demands.Except to demand with high intensity, excellent strength-toughness, weldability and great surface quality steel plate constantly increasing, and also harsh further to the requirement of material.Various countries surveying society is to the technical requirements difference of the deck of boat, but difference is little, and the ship rule according to various countries surveying society are divided into common intensity rank and high intensity levels with deck of boat steel usually.The common intensity level is divided into A, B, four quality scales of D, E, the high strength level is divided into three intensity ranks and four quality scale: A32, D32, E32, F32, A36, D36, E36, F36, A40, D40, E40, F40, and wherein the yield strength of A40, D40, E40, F40 is not less than 390N/mm
2, tensile strength 510～660N/mm
2, A, D, E, F represent respectively its separately can be respectively following getable impelling strength of situation of 0 ℃ ,-20 ℃ ,-40 ℃ ,-60 ℃.The deck of boat steel of common intensity is mainly used in the boats and ships housing of building the following navigating area, ocean of coastal, inland river and ton, high-strength ship plates is applicable to and builds the above boats and ships housing of ocean ton because it has intensity height, good combination property, can alleviate hull mass, improves the advantage of load.
For guaranteeing the security and the reliability of boats and ships, various countries surveying society is to different size, the chemical ingredients of the trade mark deck of boat, mechanical property and condition of delivery have all been made strict regulation, what have is requiring deck of boat hardness of steel to reach on the basis of certain level, also require to have the cooperation of good low-temperature impact toughness, also require the deck of boat of each trade mark to have good welding property and sea water corrosion resistant simultaneously, with compensation various heat in manufacture process, the material capability that cold working causes descends, especially significant points such as mast, the position of the vertical varying stress maximum of hull, bottomplate and side of a ship portion crack arrest plate etc.Boats and ships for world-wide, more require to have lower prolonging-brittle transition temperature under the cold condition, be that good low-temperature flexibility will have the adaptability that satisfies the complete processing in the shipbuilding n., because ship's form is comparatively complicated, the curved surface that many types are arranged, therefore material must have good weldability on the one hand, will satisfy the shaping operations such as hot and cold curved and flame forming plate to material simultaneously, unlikely formation surface damage and generation microcrack etc.
Along with the output increase of high strength steel plate for ship building and the raising of quality, production contradiction also immediately shows especially out.Owing to could deliver goods after high strength steel plate for ship building overwhelming majority production technique need adopt hot rolling+heat treatment normalizing at present, so the raising of output has also increased treatment production pressure widely, also delayed simultaneously delivery date, restricted the scale operation of high strength steel plate for ship building, and normalizing treatment will increase the production cost of the deck of boat.Sometimes heat-treated apparatus and process Effect on Performance; fluctuation as normalizing producer gas quality (mainly being impurity level) and flow; the reduction of furnace bottom roll surface quality etc.; to make surface of steel plate oxide skin thicken and produce pit; not only increased the polish workload of steel plate pit of workman; plate surface quality descends after causing normalizing simultaneously; this has not only reduced the quality grade of high strength ship steel; also influenced user's use; so through behind one normalizing process; from the production cycle; cost; aspects such as plate surface quality have all limited the production-scale further expansion of high strength steel plate for ship building.
So (Thermo Mechanical Control Process: hot mechanical CONTROL PROCESS) since the technological development, the range of application of TMCP constantly enlarges, and has become the indispensable technology of slab of producing at present along with TMCP.The TMCP steel is compared with normalized steel with the pair rolling steel, it does not rely on alloying element, by the water-cool control tissue, can reach the requirement of high strength and high tenacity, and under the lower situation of carbon equivalent, can produce the steel of same intensity, and the preheating temperature in the time of therefore can reducing or omit welding, carbon equivalent is hanged down the hardness that can reduce welded heat affecting zone again, be not easy to form the local hardening phase that produces because of microsegregation, guarantee the toughness of weld easily.The appearance of TMCP steel has promoted the broadened application of high strength ship steel, its Application Areas is except the shipbuilding field, various fields such as offshore structure, line pipe and building, bridge etc. have also been related to, in addition, TMCP still is a technology of saving the alloy and the energy, from the environmental protection aspect, it also is a far-reaching technology.Therefore, some countries are studied TMCP type ship plate, by retrieval, have following related application to relate to this type of steel grade, and its chemical ingredients sees Table 1.
Table 1
The chemical ingredients of related application steel grade (wt%)
| Element | C | Mn | Si | S | P | Nb | Ti | V | Alt |
| 1 | 0.02～ 0.20 | 0.5～ 2.0 | ≤0.4 | ≤0.006 | ≤0.015 | 0.01～ 0.10 | 0.005～ 0.030 | ≤0.1 | ≤0.006 |
| 2 | 0.02～ 0.15 | 0.05 ～2.0 | ≤0.4 | ≤0.006 | ≤0.015 | ≤0.03 | 0.005～ 0.030 | ≤ 0.03 | ≤0.006 |
| 3 | 0.02～ 0.15 | 0.05 ～2.0 | ≤0.4 | ≤0.006 | ≤0.015 | ≤0.03 | 0.005～ 0.030 | ≤ 0.03 | ≤0.006 |
| 4 | 0.05～ 0.15 | 1.2～ 2.0 | ＜0.4 | ＜0.005 | ＜0.02 | 0.005～ 0.03 | 0.005～ 0.02 | ≤ 0.03 | ≤0.005 |
| 5 | ≤ 0.10 | ≤ 1.80 | ≤0.4 | ≤0.03 | ≤0.03 | ||||
| 6 | 0.02～ 0.20 | 0.3～ 2.5 | 0.02～ 1.00 | ≤0.02 | ≤0.04 | 0.001～ 0.065 | |||
| 7 | 0.03～ 0.13 | 0.8～ 1.6 | 0.05～ 0.4 | ≤0.010 | ≤0.010 | 0.003～ 0.010 | 0.005～ 0.015 | 0.01～ 0.05 | |
| 8 | 0.04～ 0.08 | 1.4～ 1.85 | 0.1～ 0.5 | 0.015～ 0.060 | 0.005～ 0.030 | 0.015～ 0.05 | |||
| 9 | 0.015 ～0.08 | 1.5～ 1.7 | 0.26～ 0.46 | 0.015～ 0.060 | 0.005～ 0.03 | 0.015～ 0.05 | |||
| 10 | 0.052 ～0.08 | 1.65 ～1.9 | 0.1～ 0.5 | 0.015～ 0.060 | 0.005～ 0.03 | 0.015～ 0.05 | |||
| 11 | 0.06～ 0.11 | 1.3～ 1.5 | 0.2～ 0.5 | ≤0.005 | ≤0.020 | 0.005～ 0.025 | 0.005～ 0.015 | 0.015～ 0.05 | |
| 12 | 0.01～ 0.18 | 1.0～ 1.8 | 0.05～ 0.4 | ＜0.01 | ＜0.015 | 0.01～ 0.08 | 0.01～ 0.08 | 0.001～ 0.06 |
Table 1 (continuing)
The chemical ingredients of related application steel grade (wt%)
| Element | N | O | Mg | Mo | Cu | Ni | Cr | B | Ca | REM |
| 1 | 0.001～ 0.005 | 0.002～ 0.006 | 0.0005 ～0.005 | ≤1.5 | ||||||
| 2 | 0.001～ 0.005 | 0.001～ 0.004 | 0.0005 ～0.005 | ≤0.5 | ≤0.5 | ≤0.5 | ≤ 0.0015 | ≤ 0.005 | ≤ 0.005 | |
| 3 | 0.001～ 0.005 | 0.001～ 0.004 | 0.0003 ～0.004 | ≤0.5 | ≤0.5 | ≤0.5 | ≤ 0.0015 | ≤ 0.005 | ≤ 0.005 | |
| 4 | 0.0015 ～0.006 | 0.001～ 0.006 | ≤0.5 | ≤1.5 | ≤0.5 | ≤ 0.5 | ≤ 0.005 | ≤ 0.005 | ||
| 5 | ≤0.5 | ≤1.0 | ||||||||
| 6 | ≤0.01 | |||||||||
| 7 | ≤ 0.004 | ≤0.5 | ≤1.0 | |||||||
| 8 | 0.001～ 0.005 | 0.1～ 0.6 | 0.05～ 0.6 | 0.0005 ～0.003 | ||||||
| 9 | 0.2～ 0.5 | 0.4～ 0.6 | 0.26～ 0.4 | 0.0005 ～0.003 | ||||||
| 10 | 0.25～ 0.5 | 0.62～ 0.85 | 0.42～ 0.8 | 0.0005 ～0.003 | ||||||
| 11 | ≤ 0.005 | 0.1～ 0.2 | 0.1～ 0.2 | |||||||
| 12 | 0.002～ 0.012 | 0.0001 ～0.003 | 0.0001 ～0.03 |
Related application:
1, publication number is JP 9310119A, denomination of invention discloses a kind of adding by the Mg/Ni alloy for the open text of the Japanese Patent of " manufacture method with good heat affected zone flexible steel plate ", a kind of slab that adopts the TMCP method to produce with large-line energy welding property, design of alloy is comparatively complicated, and and the low-temperature impact toughness of failed call steel plate.
2, publication number is JP 9279235A, denomination of invention discloses a kind of method by magnesium oxide metallurgy for the open text of the Japanese Patent of " manufacture method with good heat affected zone flexible steel plate ", obtain a kind of slab with good welding heat influence area toughness, comprised elements such as Mo, Ni, Cr in the alloying constituent, cost is higher.
3, publication number is JP 9279234A, and denomination of invention is similar to above-mentioned two pieces of open texts for the open disclosed content class of text of Japanese Patent of " manufacture method with large-line energy welding and good heat affected zone flexible steel plate ".
4, publication number is JP 9202920A, denomination of invention is the open text of Japanese Patent of " manufacture method with large-line energy welding and good heat affected zone flexible high tensile steel plate ", its clearly to Di '=(C/10) (sup1/2) (1+0.7Si) [5+5.1 (Mn-1.2)] (1+0.27Cu) (1+0.36Ni) (1+2.16Cr) (1+3 Mo) stipulate, therefore more strict in the composition design.
5, publication number is JP 6240355A, denomination of invention is the open text of the Japanese Patent of " manufacture method of high tenacity TMCP type Plate Steel ", its composition is comparatively simple, only require C content≤0.1wt%, but on TMCP technology, require too strict, for example, cause the increase of manufacturability reduction and cost in the deflection and the texturing temperature of non-recrystallization zone.
6, publication number is JP 5295432A, denomination of invention is the open text of the Japanese Patent of " manufacture method of online hot mechanical treatment high-toughness high-strength steel plate ", its steel plate does not adopt the microalloy composition, but on TMCP technology, require too strict, for example require on speed of cooling greater than 20 ℃/s, this is to be difficult to realize for thickness greater than the steel plate of 20mm on plate mill, has increased the production difficulty, cause the increase of manufacturability reduction and cost, and do not set forth the desired value that toughness reaches.
7, publication number is JP 62093346A, denomination of invention is in the open disclosed steel of text of the Japanese Patent of " high-strength steel that has good COD value in the welding zone ", Nb content is less, in the TMCP technology controlling and process, can't play the grain refining effect, and processing requirement strictness, for example deflection and the fast cooling temperature in non-recrystallization zone requires too strict, cause the increase of manufacturability reduction and cost, the performance of this steel is mainly reflected in welded heat affecting zone in addition, does not mention low-temperature impact toughness.
8, publication number is CN 1786247A, denomination of invention is in the open disclosed steel grade of text of the Chinese patent of " high toughness low carbon bainite thick steel plate and production method thereof ", add more alloy, and adopted TMCP+RPC technology to improve the intensity of steel, increased manufacturing cost.
9, publication number is CN 1786246A, denomination of invention is in the open disclosed steel grade of text of the Chinese patent of " high tensile strength high toughness low yield ratio bainite steel and production method thereof ", add more alloys such as Mo, Ni, and adopt TMCP+RPC+SQ technology, by subsequent disposal to improve hardness of steel to 800N/mm
2, yield tensile ratio is applicable to fields such as building structure, engineering machinery less than 0.85.
10, publication number is CN 1786245A, denomination of invention is in the open disclosed steel grade of text of the Chinese patent of " high tensile strength low carbon bainite thick steel plate and production method thereof ", also added more alloy, and adopted TMCP+RPC+SQ technology, improved hardness of steel to 900N/mm
2, technology is comparatively complicated.
11, publication number is the disclosed steel plate of KR 2003053122A, and its intensity rank is 350MPa, can not be used for the ocean structure manufacturing.
12, publication number is CN 101050502A, and denomination of invention is mainly reflected in welded heat affecting zone for the open disclosed plate property of text of the Chinese patent of " a kind of soldering boat deck steel in high intensity by large line energy and manufacture method thereof ", does not mention low-temperature impact toughness.
In order to overcome the above problems, the present inventor is based on low C, high Mn, by adding microalloy elements such as micro-Nb, Ti, and controls in conjunction with the TMCP rolling technology, design a kind of TMCP type ocean structure slab of high-intensity high-tenacity, thereby finished the present invention.
One object of the present invention is to provide a kind of TMCP type ocean structure slab.
Another object of the present invention is to provide the manufacture method of described slab.
Summary of the invention
First aspect of the present invention provides a kind of TMCP type ocean structure slab, the chemical ingredients of described slab comprises: C:0.015～0.18wt%, Mn:0.5～2.0wt%, Si≤0.6wt%, S≤0.003wt%, P≤0.015wt%, Nb:0.015～0.120wt%, Ti:0.005～0.030wt%, Alt≤0.060wt%, Ca≤0.010wt%, N:0.003～0.010wt%, O:0.001～0..006wt%, surplus is Fe and unavoidable impurities.
In a preferred implementation: also comprise in the chemical ingredients of described slab being selected from the following element one or more: Cu＜1.2wt%, Ni＜1.5wt%, Cr＜1.2wt%.
In another preferred implementation: also comprise in the chemical ingredients of described slab: V＜0.12wt%, Mo＜0.6wt%.
Below, TMCP type ocean structure of the present invention is done as being described in detail with the chemical ingredients of slab.
C: be strengthening element most economical, the most basic in the steel, by solution strengthening and precipitation strength the intensity that improves steel there is obvious effect, but raising C content has negative impact to ductility, toughness and the weldability of steel, therefore modern age steel evolution be the process that constantly reduces C content, reduce the toughness that C content helps to improve steel on the one hand, can improve the welding property of steel on the other hand.General when C content is lower than 0.11wt% steel can have good weldability, to need more the steel of high tenacity then adopt C to design less than the ultralow C content of 0.09wt%.The carbon content of slab of the present invention is controlled at 0.015～0.18wt% scope and is advisable.
Mn: the intensity that improves steel by solution strengthening, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the steel because of C content, Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, help to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.Therefore Mn content is advisable to be controlled in 0.5～2.0wt% scope.
Nb: be one of topmost element in the modern microalloyed steel, fairly obvious to the effect of grain refining.Separate out the austenitic answer of obstruction deformation, recrystallize by NbC strain inducing in the course of hot rolling, when making the rolling deformation austenite structure in non-recrystallization zone in phase transformation, controlled rolling and controlled chilling change tiny phase-change product into, so that steel has high strength and high tenacity.The present invention cooperates suitable C content to improve the content of Nb, thereby brings into play the effect of NbC, so Nb content generally is controlled at 0.015～0.120wt%.
Ti: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilize the Ti fixing following N of 60ppm in the steel just about 0.02wt%, when sheet billet continuous casting, can form the TiN precipitated phase of tiny high-temperature stable, austenite crystal when this tiny TiN particle can hinder the slab reheat is effectively grown up, help to improve the solid solubility of Nb in austenite, simultaneously the impelling strength of improving welded heat affecting zone is had obvious effect.Therefore the content of Ti is advisable to be controlled in 0.005～0.030wt% scope.
S, P: be unavoidable impurities element in the steel, content is low more good more.By super low sulfur (less than 30ppm) and Ca processing sulfide is carried out inclusion morphology control, can make steel have high impelling strength and good resistance HIC performance.
Al: deoxidant element, but crystal grain thinning, if too high levels is harmful to welding heat influence area toughness in steel and the steel.Therefore Al content should≤0.060wt% is advisable.
Mo: be to enlarge the γ phase region, separate out ferrite earlier when postponing γ → α phase transformation and form, promote the principal element that acicular ferrite forms, phase-change organization plays an important role to control, the Mo of adding＜0.6wt% can obtain tangible acicular ferrite and bainite structure in the soft steel under certain cooling conditions and termination rolling temperature, change to the low temperature direction because of phase transformation simultaneously, can make and organize further refinement, it mainly is the intensity that improves steel by the phase transformation strengthening of tissue.
Cu, Ni: can improve the intensity of steel by the solution strengthening effect, Cu also can improve the solidity to corrosion of steel simultaneously.The adding of Ni mainly is to improve the red brittleness that Cu easily causes in steel, and also useful to toughness, also can compensate the strength degradation that causes steel because of the increase of thickness in thick steel plates.
Second aspect of the present invention provides the manufacture method of a kind of TMCP type ocean structure with slab, this method comprises smelting, refining, casting, heating, rolling, cooling, wherein in the described operation of rolling, the recrystallization zone rolling temperature is 920～1100 ℃, and non-recrystallization zone rolling temperature is 720～880 ℃; In described process of cooling, speed of cooling is 3～30 ℃/S.
In a preferred implementation: in described heat-processed, Heating temperature is 1100～1250 ℃.
In another preferred implementation: in described process of cooling, stopping cooling temperature is 200～600 ℃.
, with in the manufacture method of slab its TMCP technological principle that adopts is analyzed as follows at TMCP type ocean structure of the present invention:
Steel is rolled in the low-temperature region in austenite non-recrystallization zone after the austenite recrystallization zone is rolling again, thereby deformed belt is imported in the austenite of distortion.In adding the steel of Nb, owing to effectively suppressed the recrystallize of separating out because of the NbC strain-induced in rolling, so the temperature in non-recrystallization zone raises, even do not implement utmost point low temperature rolling, also can import a large amount of deformed belts.When the ferritic transformation, this deformed belt can also work as phase transformation nuclear from austenite.The perlite that controlled chilling generates during with air cooling becomes fine dispersive bainite, control the mixed structure that cold tissue is thin grained ferrite and fine diffuse type bainite like this after the controlled rolling, the increase of the refinement of ferrite crystal grain and bainite ratio can improve extensibility when improving intensity.The concrete reason that the control cold energy obtains thinning effect is: introduce after the controlled rolling and quicken cooling control, can reduce austenitic transformation temperature, condensate depression increases, increase γ-α phase driving force, make α from more forming core dot generation, suppress growing up of α crystal grain simultaneously, and because the speed of cooling increase, stop or postponed carbon, nitride separating out too early in process of cooling, thereby be easy to generate the precipitate of disperse more.Further improve the microalloyed steel speed of cooling, can form bainite or acicular ferrite, further improve the obdurability of steel.In a word, the TMCP technology be by the controlled rolling temperature and roll postcooling speed, refrigerative begins temperature and final temperature, control steel pyritous austenite structure form and control phase transition process, types of organization, form and the distribution of final control steel, the tissue and the mechanical property of raising steel.
Beneficial effect of the present invention is:
1, alloying constituent is simple relatively, can add and can not add as Cu, Ni etc., has reduced manufacturing cost, has increased the production manufacturability.
2, compare with the deck of boat of present use, have high intensity rank and good manufacturability, guarantee the welding property of thick steel plates, and has higher impelling strength (Charpy-V impact power when 20 ℃ and-40 ℃ all can reach more than the 120J), can be widely used in making D40, E40 hull structure and ocean platform, its performance index are as shown in table 2.
The performance index of table 2 slab of the present invention
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Press chemical ingredients electric furnace or the converter smelting shown in the table 3, external refining again, and be cast as slab, slab is heated to 1100～1250 ℃, carry out two stage rolling on thick milling train, the recrystallization zone rolling temperature is 920～1100 ℃, and non-recrystallization zone rolling temperature is 720～880 ℃.After the rolling end, steel plate enters and quickens cooling (ACC) device, is cooled to 200～300 ℃ with 7～12 ℃ speed, makes the D40 slab, and the Finished Steel plate thickness is 20mm.
Embodiment 2
Embodiment is with embodiment 1, and wherein the Finished Steel plate thickness is 40mm; The steel plate speed of cooling is 15～23 ℃, and final temperature is 400～500 ℃.
Embodiment 3
Embodiment is with embodiment 1, and wherein the Finished Steel plate thickness is 55mm; The steel plate speed of cooling is 10～18 ℃, and final temperature is 350～450 ℃.
Embodiment 4
Embodiment is with embodiment 1, and wherein the Finished Steel plate thickness is 60mm; The steel plate speed of cooling is 10～15 ℃, and final temperature is 430～550 ℃.
Embodiment 5
Embodiment is with embodiment 1, and wherein the Finished Steel plate thickness is 88mm; The steel plate speed of cooling is 5～12 ℃, and final temperature is 450～560 ℃.
Table 3
The TMCP type D40 ocean structure of the embodiment of the invention 1-5 chemical ingredients (wt%) of slab
| Embodiment | C | Mn | Si | S | P | Nb | Ti |
| 1 | 0.030 | 1.95 | 0.15 | 0.002 | 0.012 | 0.115 | 0.016 |
| 2 | 0.050 | 1.6 | 0.25 | 0.0018 | 0.01 | 0.06 | 0.014 |
| 3 | 0.100 | 1.6 | 0.2 | 0.0016 | 0.011 | 0.02 | 0.018 |
| 4 | 0.08 | 1.51 | 0.2 | 0.016 | 0.01 | 0.018 | 0.016 |
| 5 | 0.17 | 0.7 | 0.2 | 0.0010 | 0.011 | 0.015 | 0.015 |
Table 3 (continuing)
The TMCP type D40 ocean structure of the embodiment of the invention 1-5 chemical ingredients (wt%) of slab
| Embodiment | V | Alt | Mo | Cu | Ni | Cr | Ca | N | O |
| 1 | - | 0.04 | - | 0.1 | 0.2 | - | 0.0035 | 0.006 | 0.0030 |
| 2 | - | 0.041 | - | 0.1 | 0.2 | 0.2 | 0.0028 | 0.0055 | 0.0020 |
| 3 | - | 0.038 | - | - | - | - | 0.003 | 0.0051 | 0.0025 |
| 4 | - | 0.05 | - | - | - | 0.15 | 0.003 | 0.0035 | 0.0020 |
| 5 | - | 0.04 | - | 0.2 | 0.4 | 0.2 | 0.0028 | 0.0030 | 0.0020 |
Embodiment 6
Press chemical ingredients electric furnace or the converter smelting shown in the table 4, external refining again, and be cast as slab, slab is heated to 1100～1250 ℃, carry out two stage rolling on thick milling train, the recrystallization zone rolling temperature is 920～1100 ℃, and non-recrystallization zone rolling temperature is 720～880 ℃.After the rolling end, steel plate enters and quickens cooling (ACC) device, is cooled to 500～600 ℃ with 20～28 ℃ speed, makes the E40 slab, and the Finished Steel plate thickness is 30mm.
Embodiment 7
Embodiment is with embodiment 6, and wherein the Finished Steel plate thickness is 80mm; The steel plate speed of cooling is 7～15 ℃, and final temperature is 300～450 ℃.
Embodiment 8
Embodiment is with embodiment 6, and wherein the Finished Steel plate thickness is 80mm; The steel plate speed of cooling is 15-22 ℃, and final temperature is 300～450 ℃.
Embodiment 9
Embodiment is with embodiment 6, and wherein the Finished Steel plate thickness is 80mm; The steel plate speed of cooling is 15-22 ℃, and final temperature is 300～450 ℃.
Table 4
The TMCP type E40 ocean structure of the embodiment of the invention 6-9 chemical ingredients (wt%) of slab
| Embodiment | C | Mn | Si | S | P | Nb | Ti |
| 6 | 0.018 | 1.95 | 0.15 | 0.002 | 0.012 | 0.115 | 0.016 |
| 7 | 0.12 | 0.6 | 0.2 | 0.0010 | 0.011 | 0.015 | 0.015 |
| 8 | 0.045 | 1.62 | 0.26 | 0.0016 | 0.01 | 0.055 | 0.014 |
| 9 | 0.040 | 1.60 | 0.25 | 0.0018 | 0.01 | 0.06 | 0.014 |
Table 4 (continuing)
The TMCP type E40 ocean structure of the embodiment of the invention 6-9 chemical ingredients (wt%) of slab
| Embodiment | V | Alt | Mo | Cu | Ni | Cr | Ca | N | O |
| 6 | - | 0.04 | - | 0.1 | 0.2 | - | 0.0035 | 0.006 | 0.0030 |
| 7 | - | 0.04 | - | 0.3 | 0.6 | 0.4 | 0.0028 | 0.0030 | 0.0020 |
| 8 | 0.05 | 0.041 | - | 0.1 | 0.2 | 0.2 | 0.0030 | 0.0050 | 0.0019 |
| 9 | - | 0.041 | 0.10 | 0.1 | 0.2 | 0.2 | 0.0028 | 0.0055 | 0.0020 |
Test example 1
TMCP type D40 ocean structure to embodiment of the invention 1-5 carries out Mechanics Performance Testing and Charpy impact test with slab, and test result sees Table 5.
The TMCP type D40 ocean structure of table 5 embodiment of the invention 1-5 The performance test results of slab
Test example 2
TMCP type E40 ocean structure to embodiment of the invention 6-9 carries out Mechanics Performance Testing and Charpy impact test with slab, and test result sees Table 6.
The TMCP type E40 ocean structure of table 6 embodiment of the invention 6-9 The performance test results of slab
From table 5,6 as can be seen, all greater than 400MPa, tensile strength is greater than 500MPa with the slab yield strength for TMCP type ocean structure of the present invention, and the Charpy-V impact power 〉=120J when-20 ℃ and-40 ℃ has good low-temperature impact toughness and weldability.
Claims (6)
1, a kind of TMCP type ocean structure slab, it is characterized in that, the chemical ingredients of described slab comprises: C:0.015～0.18wt%, Mn:0.5～2.0wt%, Si≤0.6wt%, S≤0.003wt%, P≤0.015wt%, Nb:0.015～0.120wt%, Ti:0.005～0.030wt%, Alt≤0.060wt%, Ca≤0.010wt%, N:0.003～0.010wt%, O:0.001～0..006wt%, surplus is Fe and unavoidable impurities.
2, TMCP type ocean structure slab according to claim 1 is characterized in that, also comprises in the chemical ingredients of described slab being selected from the following element one or more: Cu＜1.2wt%, Ni＜1.5wt%, Cr＜1.2wt%.
3, TMCP type ocean structure slab according to claim 1 is characterized in that, also comprises in the chemical ingredients of described slab: V＜0.12wt%, Mo＜0.6wt%.
4, the described TMCP type of the claim 1 ocean structure manufacture method of slab, comprise smelting, refining, casting, heating, rolling, cooling, it is characterized in that, in the described operation of rolling, the recrystallization zone rolling temperature is 920～1100 ℃, and non-recrystallization zone rolling temperature is 720～880 ℃; In described process of cooling, speed of cooling is 3～30 ℃/S.
5, TMCP type ocean structure according to claim 4 is characterized in that with the manufacture method of slab in described heat-processed, Heating temperature is 1100～1250 ℃.
6, TMCP type ocean structure according to claim 4 is characterized in that with the manufacture method of slab, and in described process of cooling, stopping cooling temperature is 200～600 ℃.
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