CN102400045B - Large-specification and high-strength D40 hot-rolled flat-bulb steel for ships and production process for hot-rolled flat-bulb steel - Google Patents
Large-specification and high-strength D40 hot-rolled flat-bulb steel for ships and production process for hot-rolled flat-bulb steel Download PDFInfo
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Abstract
The invention relates to large-specification and high-strength D40 hot-rolled flat-bulb steel for ships and a production process for the hot-rolled flat-bulb steel, and belongs to the technical field of marine structural steel. The large specification of the large-specification and high-strength hot-rolled flat-bulb steel is No. 40 and over No.40. The steel comprises the following chemical ingredients in percentage by weight: 0.08 to 0.15 percent of C, 0.10 to 0.50 percent of Si, 1.15 to 1.75 percent of Mn, less than or equal to 0.020 percent of S, less than or equal to 0.020 percent of P, 0.08 to 0.15 percent of V, 0.10 to 0.50 percent of Ni, 0.01 to 0.03 percent of Ti, 0.001 to 0.01 percent of Mg, 0.001 to 0.01 percent of Ca, 0.001 to 0.01 percent of O, 0.016 to 0.025 percent of N and the balance of Fe and inevitable impurities, wherein Mn/C is more than or equal to 14.0, Ni/Mn is more than or equal to 0.15, and (Mg+Ca)/O is more than or equal to 1.0. The production process comprises the following steps of: feeding a vanadium nitrogen alloy wire with the diameter of 13 millimeters and a Mg-Ca alloy wire with the diameter of 10 millimeters into molten steel after vacuum is finished, and blowing argon and stirring at the bottom; and in the hot rolling process, heating a low-temperature blank, performing final rolling for large deformation and cooling after rolling. The large-specification and high-strength D40 hot-rolled flat-bulb steel has the advantages that: the requirements of yield strength and impact toughness at the low temperature of -40 DEG C can be met, the flat-bulb steel is used for stiffeners at bilge keels of large-scale ships, and the rigidity of the ships and the safety coefficients of the ships used at the low temperature are improved obviously under the condition that the weight of the ships is not improved.
Description
Technical field
The invention belongs to structure iron technical field peculiar to vessel, particularly relate to a kind of large-size high-tensile degree D40 hot rolling flat bulb steel peculiar to vessel and production technique thereof, described large specification refer to No. 40 and more than.
Background technology
Flat bulb steel is a kind of auxiliary profile that is mainly used in all kinds of big-and-middle-sized shipbuilding n.s, and its consumption is only second to ship plate.Studies show that, when section modulus was identical or close, the moment of inertia of flat bulb steel was generally all large than unequal-angle bar, equal legged angle, band steel and T-shaped material, and section area is then less, therefore it becomes and improves the proper hull moment of inertia, guarantees hull rigidity, reduces the requisite member of hull weight.Along with hull construction maximization, high speed and automation direction development, high strength, high low-temperature flexibility and large normalized demand have been proposed Flat-bulb Steel for Ship Use.
Flat bulb steel belongs to extremely asymmetric Special-shaped cross-section steel of cross section, general employing groove rolling, different with plate rolling, section rolling often is subjected to equipment condition, the impacts such as pass design, when producing, can't adopt depressing greatly in austenite non-recrystallization district, can only adopt gently depressing at austenite recrystallization district multi-pass, the draught of machining deformation amount once and accumulative total is all smaller, thick original austenite grains is difficult to refinement, again take air cooling as main, it is also very difficult that cooling is evenly accelerated in whole cross section, causes microstructure coarsening after rolling, can't obtain fine grained texture, thereby can't obtain preferably combination of strength and toughness by controlled rolling and controlled cooling generation grain refining as sheet material.
Aspect the high strength requirement, traditional civilian flat bulb steel mainly adopts the C-Mn alloy designs, and yield strength generally is not higher than 355MPa, such as all kinds of A32, the A36 high-strength marine flat bulb steel of domestic production.Require higher military flat bulb steel for other all kinds of yield strengths, such as the 10CrNi3MoV flat bulb steel, although yield strength can reach 390MPa, but condition of delivery is modified heat treatment state, structural state is low-carbon (LC) tempered martensite, also will add the alloying elements such as high level Ni, Cr, Mo simultaneously, composition is higher.Patent " production technique of high strength flat-bulb steel " (publication number: CN101229565A) introduced a kind of high strength flat-bulb steel and production technique thereof, come the final tissue of refinement to improve the intensity of steel by adding 0.01～0.025% Nb, but the flat bulb steel maximum intensity rank of producing is A/D36.
Aspect the low-temperature flexibility requirement, traditional civilian high strength flat-bulb steel minimum examination-20 ℃ impelling strength.Patent " production method of raising high strength flat-bulb steel low temperature impact properties percent of pass " (publication number: CN101229564B) introduced the method that improves high strength flat-bulb steel low temperature impact toughness by structural state after the control finish to gauge, but this patent towards be the A/D36 flat bulb steel, also only can improve flat bulb steel-20 ℃ low-temperature impact work.
Aspect large specification demands, tradition flat bulb steel ball size is all less than 400mm (No. 37 and following), for improving the whole moment of inertia of hull structure, alleviate the weight of hull structure, the above hull rolling keel position of common 10 tons needs No. 40 and above large-size high-tensile degree flat bulb steel, but large specification flat bulb steel is because blank structural strain's amount is little, and the finishing temperature high can't be realized the requirement of high strength and high low-temperature flexibility.
Therefore, prior art can't satisfy the service requirements of flat bulb steel high strength (390MPa and more than), high tenacity (minimum examination-40 ℃ ballistic work) and large specification (No. 40 and more than) simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use and production technique thereof, be used for high-yield strength and-40 ℃ of low-temperature impact work problems of No. 40, solution and above large specification Flat-bulb Steel for Ship Use; Can satisfy the above hull structure of 10 tons for the requirement of No. 40 and above large specification flat bulb steel high-yield strength and-40 ℃ of low-temperature impact works.
Problem of the present invention is solved by following technical scheme:
The chemical ingredients of No. 40 and above large-size high-tensile degree D40 flat bulb steel of the present invention is by weight percentage: C:0.08～0.15, Si:0.10～0.50, Mn:1.15～1.75, S, P≤0.020, V:0.08～0.15, Ni:0.10～0.50, Ti:0.01～0.03, Mg:0.001～0.01, Ca:0.001～0.01,0:0.001～0.01, N:0.016～0.025, Mn/C 〉=14.0 wherein, Ni 〉=0.15, (Mg+Ca)/and O 〉=1.0, surplus is Fe and inevitable impurity.
The restriction reason that the one-tenth of No. 40 of using among the present invention and above large-size high-tensile degree D40 flat bulb steel is grouped into describes, below mass percent in only representing to form with %.
C is the effective constituent that improves hardness of steel, and undergage is decided to be 0.08%, and yield strength, tensile strength that carbon content is crossed low steel can not meet the demands.In addition, excessive carbon can be produced a large amount of carbide, increases pearlitic quantity, significantly reduce the low-temperature flexibility of steel and improve ductile-brittle transition temperature, so the upper limit is defined as 0.15%.
Si adds as deoxidant element, also is the solution strengthening element, minimumly is added to 0.10%.Si content promotes microstructure coarsening greater than 0.50% the time, and low-temperature flexibility reduces, the weldability variation.Si of the present invention is controlled at 0.10～0.50%.
Mn is the important element that guarantees armor plate strength, also is the important element that increases carbon nitrogen amount.When Mn content is lower than 1.15%, can't satisfy the lower limit requirement of steel plate yield strength and tensile strength, the deleterious effect of S compound strengthens simultaneously.When Mn content was higher than 1.75, low-temperature flexibility significantly reduced.In addition, Mn and C content need to satisfy Mn/C 〉=14.0, are important factor for controllings among the present invention, and this mainly is lower than at 14.0 o'clock based on the new discovery in this research: Mn/C, can obtain a small amount of granular bainite microstructure in the tissue, significantly reduces the low-temperature flexibility of steel.
P content is fewer to be desirable in this patent, but industrial reduction P content need to spend larger cost, so content range is defined as below 0.02%.
S content is fewer to be desirable in this patent, but industrial reduction S content need to spend larger cost, so content range is defined as below 0.02%.
V is the significant micro alloying element of a kind of precipitation strength effect, also is the important element among the present invention.When content of vanadium was lower than 0.08%, the low strength of steel can't satisfy the yield strength minimum requirements.Simultaneously, separating out of vanadium can also promote the ferritic formation of intracrystalline, can put forward the high-intensity toughness that improves simultaneously steel.But along with the increase of content of vanadium, precipitation size significantly increases, and particle increases, and reduces on the contrary the low-temperature flexibility of steel, promoted simultaneously the formation of M-A island structure in the steel, so content of vanadium should be controlled at 0.15%.
Ni is the important element among the present invention, need to add minimumly 0.10%, and for cost consideration, the upper limit should be controlled at 0.50%.Should strictly control Ni/Mn 〉=0.15 simultaneously, this mainly is because the increase of Mn can make and increase granular bainite in the tissue, thereby the raising effect of the toughness that Ni brings is disappeared.
Ti can with steel in nitrogen in conjunction with generating the TiN particle, be conducive to suppress to reheat the alligatoring of austenite crystal, minimum Ti content should be controlled at 0.01% in the steel.But excessive Ti meeting reduce the low-temperature flexibility of steel, so the upper limit is defined as 0.03% so that the nitride of a large amount of macrobead Ti exists.
Mg, Ca is the key element among the present invention, it is strong deoxidant element in the steel, O is in conjunction with forming tiny oxide particle in meeting and the steel, VN particle forming core on tiny MgCa oxide compound is separated out, composite particles can promote the ferritic forming core of intracrystalline preferably, and the refinement ferrite grain size improves low-temperature flexibility significantly.For guaranteeing separating out of a large amount of fine particle, Mg, Ca, O lower limit all are controlled to be 0.001%.But excessive Mg, Ca and O all can so that in the steel oxide inclusion quantity increase, size increases, and can't play function of organization in the refinement steel, reduces the low-temperature flexibility of steel.Therefore, the upper limit of Mg, Ca, O content all is controlled to be 0.01% in the steel.Simultaneously, (Mg+Ca)/O 〉=1 o'clock, the oxide quantity that forms in the steel is more, and size is less, and can be so that a large amount of compound the separating out on oxide compound of VN particle, and the significant final microstructure of refinement improves low-temperature flexibility.
N is a kind of crucial micro alloying element among the present invention.V in N meeting and the steel and Ti are in conjunction with forming Second Phase Precipitation thing particle, and wherein the VN particle can improve yield strength and the promotion intracrystalline ferrite forming core of steel, the ferrite grain size that refinement is final significantly.Therefore, give full play to the effect of V and Ti in the steel, content should not be lower than 0.016%.The too high N that increases, going out has outside the negative impact continuous casting operation and slab quality, also can form a large amount of strong nitrogen in steel, and the increase aged brittleness significantly reduces the low-temperature flexibility of steel, and its content should not be above 0.025%.
No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use of the present invention, mainly towards ball size 400-430mm, the dimensions of web thickness 18-25mm.Ball size is lower than the flat bulb steel that 400mm or web thickness be lower than 18mm and adopts conventional alloy designs technology to obtain.
No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use of the present invention, mainly towards be yield strength more than or equal to 390MPa, web 1/3 position vertically-40 ℃ of Charpy-V impact powers more than or equal to the 41J performance requriements.Yield strength is lower than the flat bulb steel that 390MPa or impelling strength is lower than above-mentioned requirements and adopts conventional alloy designs technology to obtain.
The technical parameter of production craft step of the present invention and control is as follows:
Smelt: in steelmaking process, adopt diameter be the VN alloy silk of 12mm after vacuum finishes in the feeding molten steel, and BOTTOM ARGON BLOWING is stirred molten steel.Because the vacuum-treat meeting significantly reduces the content of free nitrogen in the molten steel, therefore feeding VN alloy silk is conducive to improve the rate of recovery of vanadium and nitrogen after vacuum, and argon bottom-blowing stirs simultaneously, avoids the N atom generation nitrogen that mutually combines, and reduces the rate of recovery of nitrogen in steel.Adopt subsequently in the Mg-Ca B alloy wire feeding molten steel of diameter 10mm, mainly in order to obtain a large amount of tiny Mg, Ca oxide particles, adopt argon gas to stir to allow even, the tiny branch of oxide particle in molten steel.
Hot rolling: its blank heating temperature is 1150～1200 ℃, mainly places remarkable thickization of original austenite grains size.Adopt all final ferrite grain sizes of significantly refinement of low temperature (850～950 ℃ of finishing temperatures) and last pass aximal deformation value (15～20%), improve low-temperature flexibility.Adopt spray cooling after the finish to gauge, cooling rate is 2～10 ℃/s, and the further final ferrite grain size of refinement improves the low-temperature flexibility of steel.
The present invention has the following advantages:
1, No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use and production technique of the present invention, can satisfy simultaneously large specification (ball size 400-430mm, web thickness 18-25mm), high-yield strength (〉=390MPa), (Akv-40 ℃ 〉=41J) requirement of high/low-temperature impact toughness;
2, No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use and production technique of the present invention can be used for the large ship stiffener, can significantly improve the use safety coefficient under hull rigidity and the cold condition under the condition of little amplitude raising hull weight.
3, No. 40 and above large-size high-tensile degree D40 Flat-bulb Steel for Ship Use and production technique of the present invention, operating procedure is easy, is specially adapted to require the production of large specification, high strength, high low-temperature flexibility flat bulb steel.
Embodiment:
The below will be by different embodiment and Comparative Examples the present invention relatively described.These embodiment only are used for the purpose of explanation, the invention is not restricted among these embodiment.
Table 1 is the chemical ingredients of various flat bulb steels in embodiment and the Comparative Examples, and wherein the embodiment steel is 4 kinds, 4 kinds of Comparative Examples steel.These flat bulb steels adopt 100 tons of converter smeltings, through smelting, continuous casting, rolling technology flow process, are prepared into respectively No. 40, No. 43, and web thickness is the steel grade of 18mm, 20mm, control according to following technology point when smelting and continuous casting:
1) adopt the LF+RH process for making, the VN alloy silk of feeding diameter 12mm after RH finishes, Argon stirs 3min; Feed subsequently the Mg-Ca B alloy wire of diameter 10mm, Argon stirs 5min.
2) the control superheating temperature is lower than 20 ℃ in the casting process, and the continuously cast bloom straightening temperature is higher than 920 ℃;
3) billet heating temperature is 1180 ± 20 ℃, soaking zone 3h heat-up time;
4) start rolling temperature is 1100～1150 ℃, 880 ± 20 ℃ of finishing temperatures, last pass deflection 15%;
5) roll rear spray cooling, 2～10 ℃/s of cooling rate.
As can be seen from Table 1, according to 5 kinds of test steel of the present invention's preparation, chemical ingredients all meets claimed range of the present invention, and wherein Mn/C, Ni/Mn, (Mg+Ca)/O are than also all satisfying requirement of the present invention.V and N content all do not satisfy the invention requirement in the Comparative Examples 1, and Mn/C is than discontented unabridged version invention requirement in the Comparative Examples 2, and Ni/Mn is than discontented unabridged version invention requirement in the Comparative Examples 3, and (Mg+Ca)/O is than discontented unabridged version invention requirement in the Comparative Examples 4.
Each embodiment is tested steel plate and the sampling of Comparative Examples steel, according to GB/T 13239-2006 standard, adopt MTS NEW810 type tensile testing machine, the chuck rate travel constant with 3mm/min stretches, the test tensile performance in wale-wise, sampling point is 1/2 place of thickness of slab, and test-results is got the mean value of 2 samples.According to GB/T 229-2007 standard, adopt NCS series 500J instrumentation Charpy impact machine tester, test web 1/3 position-40 ℃ Charpy-V impact power, sampling point is 1/2 place of thickness of slab, test-results is got the mean value of 3 samples.The flat bulb steel mechanical experimental results sees Table 2.
As can be seen from Table 2, embodiment 1～4 steel is rolled into respectively 40, No. 40, when thickness 18mm, 20mm, all can satisfy yield strength greater than 390MPa, tensile strength 510～660MPa, the web Akv-40 ℃ of service requirements greater than 41J.Comparative Examples 1 yield strength, tensile strength and low-temperature impact toughness can not meet the demands, and the low-temperature impact toughness of Comparative Examples 2～4 all can not satisfy the service requirements of 41J.
The chemical ingredients (wt, %) of table 1 embodiment and Comparative Examples flat bulb steel
Table 2 embodiment and Comparative Examples flat bulb steel mechanical property
Claims (2)
1. a large-size high-tensile degree D40 flat bulb steel is characterized in that chemical ingredients is by weight percentage: C:0.08～0.15, Si:0.10～0.50, Mn:1.15～1.75, S, P≤0.020, V:0.12～0.15, Ni:0.10～0.50, Ti:0.01～0.03, Mg:0.001～0.01, Ca:0.001～0.01, O:0.001～0.01, N:0.016～0.025, Mn/C 〉=14.0 wherein, Ni/Mn 〉=0.15, (Mg+Ca)/and O 〉=1.0, surplus is Fe and inevitable impurity;
Described D40 flat bulb steel bulb width is 400-430mm, and web thickness is 18-25mm;
Satisfy the vertical yield strength in web 1/3 position and be not less than 390MPa, vertically-40 ℃ of Charpy-V impact powers are not less than 41J.
2. the production technique of a large-size high-tensile degree D40 flat bulb steel according to claim 1, it is characterized in that: the technical parameter of processing step and control is as follows:
Smelt: adopt the VN alloy silk of diameter 12mm after vacuum finishes, to feed in the steel in the steelmaking process, and argon bottom-blowing stirs; Adopt subsequently in the Mg-Ca B alloy wire feeding molten steel of diameter 10mm, and argon bottom-blowing stirs;
Hot rolling: 1150～1200 ℃ of blank heating temperatures, 850～950 ℃ of finishing temperatures, last pass deflection 15%～20% adopts spray cooling after the finish to gauge, and cooling rate is 2～10 ℃/s.
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| CN106555117A (en) * | 2016-12-02 | 2017-04-05 | 钢铁研究总院 | A kind of uniform high strength flat-bulb steel of section performance and its production technology |
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| CN102851585A (en) * | 2012-04-20 | 2013-01-02 | 宿迁南钢金鑫轧钢有限公司 | Niobium-containing large-sized high-strength angle iron and production technology thereof |
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