CN103667915A - Thermal mechanical control steel plate having favorable low-temperature flexibility and manufacturing method thereof - Google Patents
Thermal mechanical control steel plate having favorable low-temperature flexibility and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a TMCP (thermal mechanical control processing) E40 steel plate having favorable low-temperature flexibility and a manufacturing method thereof. The TMCP E40 steel plate having favorable low-temperature flexibility comprises the following components in percentage by weight: 0.04-0.10% of C, 0.10-0.30% of Si, 1.20-1.60% of Mn, no more than 0.018% of P, no more than 0.010% of S, 0.02-0.07% of Alt, 0.10-0.40% of Ni, 0.10-0.30% of Cu, 0.01-0.08% of Mo, 0.01-0.02% of Ti, 0.02-0.04% of Nb, 0.03-0.07% of V and the balance of Fe and inevitable trace impurities. According to the obtained TMCP E40 steel plate having favorable low-temperature flexibility and the manufacturing method thereof, the comprehensive property of the product is stable, the quality fluctuation is less, and the manufacturing cycle is short.
Description
Technical field
The present invention relates to a kind of steel and preparation method thereof, particularly a kind of TMCP type E40 steel plate and manufacture method thereof with good low-temperature toughness.
Background technology
Along with the development of shipbuilding industry, also more and more higher to the requirement of deck of boat performance.At present, high-strength steel for ship structure is divided strength grade by its SMYS, each strength grade is divided into A, D, E, F level by the difference of its impelling strength again, wherein, A, D, E, F represent respectively the impelling strength that it separately can be respectively can reach the in the situation that of 0 ℃ ,-20 ℃ ,-40 ℃ and-60 ℃.High strength steel grade in E40Wei classification society rule, its manufacturing processed comprises smelting, refining, continuous casting, heating, rolling, cooling.
TMCP(Thermo Mechanical Control Process: thermomechanical is controlled technique) be exactly in course of hot rolling, on the basis of controlled rolling of controlling Heating temperature, rolling temperature and draught, then implement air cooling or control cooling and accelerate cooling technology general name.Because TMCP technique is not being added too much alloying element, do not need to produce under the condition of complicated subsequent heat treatment the steel of high-intensity high-tenacity yet, be considered to one and save alloy and the energy, and environmentally friendly technique, therefore since the exploitation eighties in 20th century, become the indispensable technology of low-alloy high-strength Wide and Thick Slab of producing.
ACC(Accelerated Cooling) be continue Japan, the eighties in 20th century, on plate mill, to adopt first online acceleration after cooling apparatus, the control refrigeration technique that coordinates TMCP fast development to get up, have the advantages that cooling power is strong, precision is accurate, level of automation is high, on plate production line, be widely adopted.At present domestic have a lot of enterprises that ACC equipment has all been installed on Heavy Plate Production line, replaces the cooling apparatuss such as original jet flow, water curtain, spraying, and product hierarchy and variety range are further expanded.The most significant function of ACC is that cooling power is strong, is mainly used to produce shipbuilding, ocean structure, machine construction, the pipeline TMCP steel of high-strong toughness.
Summary of the invention
The object of the invention is to solve the deficiency of traditional controlled rolling and heat treatment technics and TMCP type E40 steel plate and the manufacture method thereof with good low-temperature toughness that a kind of low temperature impact properties percent of pass is high, the manufacturing cycle is short is provided.This deck of boat thickness is 10 ~ 70mm, and yield strength surplus capacity has 30 ~ 50Mpa, and-40 ℃ of low-temperature impact toughness are good, even reaches-60 ℃ and impacts requirement, and anti-lamellar tearing excellent performance, can be used for the construction of various big-and-middle-sized hulls and ocean platform agent structure.
To achieve these goals, the TMCP type E40 steel plate with good low-temperature toughness that the present invention is designed, by weight percentage, comprises following component: C:0.04～0.10%; Si:0.10～0.30%; Mn:1.20～1.60%; P≤0.018%; S≤0.010%; Alt:0.02～0.07%; Ni:0.10～0.40%; Cu:0.10～0.30%; Mo: 0.01～0.08%; Ti:0.01～0.02%; Nb:0.02～0.04%; V is 0.03～0.07%; Surplus is Fe and inevitable trace impurity.
Further feature is, C:0.04～0.10%, or Ni:0.10～0.40%, or Cu:0.10～0.30%, or Mo:0.01～0.08%, or Nb:0.02～0.04%, or V is 0.03～0.07%, the Pcm of above-mentioned chemical composition :≤0.20%.
P :≤0.018%, and S :≤0.010%, as preferred P≤0.012%, S≤0.005%.
The thickness of steel plate is 10～70mm, and width is 1500 ~ 3800mm, and preferred thickness is 40 ~ 70mm, and width is 2200 ~ 3200mm.
-40 ℃ of impelling strength > 200J.
Chemical cost of the present invention limits and the reasons are as follows:
C: most economical, the most basic strengthening element in steel, to improving the intensity of steel, have obvious effect, but C too high levels can affect ductility, toughness and the weldability of steel, therefore, modern age, the evolution of steel was the process that constantly reduces C content.Therefore in the present invention, the weight percent of C is: 0.04～0.10%.As preferably 0.05 ~ 0.07%.
Si: be a kind of metalloid element, there is fabulous water resistance and deoxy performance, can improve intensity and the quality of steel, therefore the weight percent of Si is in the present invention: 0.10～0.30%.
Mn: improve the intensity of steel by solution strengthening, be that in steel, compensation causes main, the most economical strengthening element of loss of strength because C content reduces, and contribute to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.Therefore, in the application, the content of Mn is 1.20～1.60%.
P, S: inevitable detrimental impurity element in steel, the defect such as easily form segregation, be mingled with, worsens welding property, the impelling strength of ship steel.Therefore, P≤0.018% in the present invention; S≤0.010%.As preferably, P≤0.015%, S≤0.005%.
Alt is Holo-Al content in steel, is sour molten aluminium and aluminum oxide sum, is conducive to crystal grain thinning, improves the toughness of steel.In the present invention, the weight percent of Alt is 0.020～0.070%.
Mo: be to expand austenitic area element, can cause moving to right of C curve, reduce condensate depression, improve greatly hardening capacity.To postpone proeutectoid ferrite to form, promote the principal element that acicular ferrite forms, by the intensity of phase transformation strengthening steel.In the present invention, the content range of Mo is 0.01～0.08%%.As preferably, Mo:0.015～0.030%.
Ni, Cu: can improve by solution strengthening effect the intensity of steel, Cu can also improve the solidity to corrosion of steel simultaneously, and Ni can reduce ductile-brittle transition temperature, thus steel plate low temperature plasticity and toughness improved.The content range that in the present invention, the content range of Ni is 0.10～0.40%, Cu is 0.10～0.30%.
Ti, Nb:Ti have that fusing point is high, proportion is little, intensity is high, good toughness, antifatigue, corrosion-resistant, thermal conductivity is low, high and low temperature tolerance performance is good, the features such as stress is little under rapid heat cycle condition.Nb is one of topmost element in modern microalloyed steel, adds appropriate Nb and Ti in steel alloy, and energy is crystal grain thinning effectively, contributes to improve the impelling strength of weld affected zone.The content range that in the present invention, the content range of Nb is 0.02～0.04%, Ti is 0.01～0.02%.
V: generally play solution strengthening effect in steel, utilize its carbide to separate out obstruction dislocation motion simultaneously when low temperature rolling, reach strengthening effect.In the present invention, the content range of V is 0.03～0.07%.
Cr: improve the important element of the hardening capacity of steel, can independent or compound interpolation, for the thick specification deck of boat, with interpolation for steel, compared with high-Cr, can effectively improve the loss of strength that hardening capacity is brought to make up thickness, improve the homogeneity of performance on thickness direction; But too high Cr and Mn add in steel simultaneously, can cause low melting point Cr-Mn composite oxides to form, in hot procedure, form surface crack, simultaneously can severe exacerbation welding property.Therefore, in the present invention Cr as residual element.
Pcm≤0.20% of above-mentioned chemical composition.
Above-mentioned Pcm is called crack-sensitivity coefficient, and its value is higher, and steel welding property is poorer.Conventionally with Pcm, weigh the welding property of steel.According to classification society rule, Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B, (Cr element and B element in formula are treated as residual element in the present invention).
The present invention also provides a kind of manufacture method with the TMCP type E40 steel plate of good low-temperature toughness, and it comprises the following steps:
1), according to the component described in claim 1～3, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is reheated, roughing and finish rolling; 3), that the finished product after rolling is carried out to ACC is cooling, it is characterized in that: reheat in operation: reheat 1100～1180 ℃ of temperature; In roughing operation: the thickness of roughing feeding is 2.5～3.0 times of finished product thicknesses; In finish rolling operation: controlled rolling thickness is 2.5～3.0 times of finished product thicknesses, and controlled rolling temperature is 830～900 ℃, and finishing temperature is 790～850 ℃; In refrigerating work procedure: adopt ACC cooling, open 770～830 ℃ of cold temperature, 480～600 ℃ of red temperatures, open and rectify 500～650 ℃ of temperature, and water coolant is than (ratio of upper and lower cooling water inflow) 1:2.2～2.3.
Above-mentioned red temperature refers to that steel are after ACC is cooling, and surface exists the temperature difference with heart portion, and heart portion heat outwards transmits, and makes the temperature that reaches after steel surface temperature recovery, and this temperature is the most effective processing parameter that affects steel tissue and performance.
Above-mentioned opening rectified temperature and referred to temperature when steel enter 11 roller thermal straightening machine after ACC is cooling, is process for cooling important parameter.
TMCP type E40 steel plate and the manufacture method thereof with good low-temperature toughness that the present invention obtains, compared with prior art, have following beneficial effect:
(1) plate property qualification rate is stable, reaches more than 97% high comprehensive performance.
(2) life cycle of the product is short, and energy consumption is few, can solve well the contradiction between performance, cost, profit and the energy.
(3) Product jointing performance is good, can exempt the preheating procedure that shipbuilding n. and oceanographic engineering are built, and reduces welding cost, improves welding production efficiency, has very high social benefit.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
The TMCP type E40 steel plate with good low-temperature toughness that the present invention is designed, by weight percentage, comprises following component: C:0.04～0.10%; Si:0.10～0.30%; Mn:1.20～1.60%; P≤0.018%; S≤0.010%; Alt:0.02～0.07%; Ni:0.10～0.40%; Cu:0.10～0.30%; Mo: 0.01～0.08%; Ti:0.01～0.02%; Nb:0.02～0.04%; V is 0.03～0.07%; Surplus is Fe and inevitable trace impurity, and surplus is Fe and trace impurity wherein.
Wherein C:0.04～0.10%, or Ni:0.10～0.40%, or Cu:0.10～0.30%, or Mo:0.01～0.08%, or Nb:0.02～0.04%, or V is 0.03～0.07%, the Pcm of above-mentioned chemical composition :≤0.20%.
Wherein: P :≤0.018%, and S :≤0.010%, as preferred P≤0.012%, S≤0.005%.
The thickness of steel plate is 10～70mm, and width is 1500 ~ 3800mm, and preferred thickness is 40 ~ 70mm, and width is 2200 ~ 3200mm.
-40 ℃ of impelling strength > 200J.
The concrete proportioning of embodiments of the invention, main with reference to the component shown in table one, and manufacture steel plate according to following technique:
1), according to the component described in claim 1～3, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is reheated, roughing and finish rolling; 3), the finished product after rolling is carried out to ACC cooling.
It is characterized in that: reheat in operation: reheat 1100～1180 ℃ of temperature; In roughing operation: the thickness of roughing feeding is 2.5～3.0 times of finished product thicknesses; In finish rolling operation: controlled rolling thickness is 2.5～3.0 times of finished product thicknesses, and controlled rolling temperature is 830～900 ℃, and finishing temperature is 790～850 ℃; In refrigerating work procedure: adopt ACC cooling, open 770～830 ℃ of cold temperature, 480～600 ℃ of red temperatures, open and rectify 500～650 ℃ of temperature, and water coolant is than (ratio of upper and lower cooling water inflow) 1:2.2～2.3.
Table 1, component table
Embodiment 1:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 30mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 1, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out in heating, roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1163 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 90mm(slab thickness 250mm), rolling 7 passages, single pass draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 90mm, controlled rolling temperature is 895 ℃, finishing temperature is 819 ℃, rolling pass 9 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 786 ℃, and red temperature is 525 ℃, and opening and rectifying temperature is 567 ℃, and the ratio of upper and lower cooling water inflow is 1:2.2.
Embodiment 2:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 35mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 2, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out in heating, roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1135 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 108mm(slab thickness 250mm), rolling 5 passages, single pass draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 108mm, controlled rolling temperature is 882 ℃, finishing temperature is 813 ℃, rolling pass 8 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 782 ℃, and red temperature is 511 ℃, and opening and rectifying temperature is 556 ℃, and the ratio of upper and lower cooling water inflow is 1:2.2.
Embodiment 3:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 45mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 3, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out to roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1157 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 130mm(slab thickness 250mm), rolling 4 passages, single pass draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 130mm, controlled rolling temperature is 852 ℃, finishing temperature is 808 ℃, rolling pass 10 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 792 ℃, and red temperature is 515 ℃, and opening and rectifying temperature is 562 ℃, and the ratio of upper and lower cooling water inflow is 1:2.25.
Embodiment 4:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 56mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 4, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out to roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1162 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 150mm(slab thickness 300mm), rolling 7 passages, single pass draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 150mm, controlled rolling temperature is 851 ℃, finishing temperature is 815 ℃, rolling pass 12 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 777 ℃, and red temperature is 495 ℃, and opening and rectifying temperature is 553 ℃, and the ratio of upper and lower cooling water inflow is 1:2.25.
Embodiment 5:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 62mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 5, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out to roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1155 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 165mm(slab thickness 300mm), rolling 5 passages, single draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 165mm, controlled rolling temperature is 845 ℃, finishing temperature is 811 ℃, rolling pass 12 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 775 ℃, and red temperature is 500 ℃, and opening and rectifying temperature is 547 ℃, and the ratio of the upper and lower cooling water inflow of water coolant is 1:2.25.
Embodiment 6:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 68mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 5, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out to roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1169 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 180mm(slab thickness 300mm), rolling 4 passages, single draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 180mm, controlled rolling temperature is 835 ℃, finishing temperature is 801 ℃, rolling pass 14 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 775 ℃, and red temperature is 492 ℃, and opening and rectifying temperature is 552 ℃, and the ratio of the upper and lower cooling water inflow of water coolant is 1:2.30.
Embodiment 7:
The TMCP type E40 steel plate with good low-temperature toughness that the present embodiment provides, the thickness of described steel plate is 70mm.Its concrete manufacturing step is as follows:
1), according to the component of embodiment in form 5, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is carried out to roughing and finish rolling; 3), to the finished product after rolling, carry out cooling.In reheating operation, reheat 1172 ℃ of temperature; In roughing operation, the thickness of roughing feeding is 180mm(slab thickness 300mm), rolling 4 passages, single draft is greater than 15%; In finish rolling operation; Controlled rolling thickness 180mm, controlled rolling temperature is 835 ℃, finishing temperature is 799 ℃, rolling pass 14 roads; Described refrigerating work procedure adopts ACC process for cooling, and when cooling, opening cold temperature is 778 ℃, and red temperature is 496 ℃, and opening and rectifying temperature is 545 ℃, and the ratio of the upper and lower cooling water inflow of water coolant is 1:2.30.
Adopt above-mentioned different implementing process to be rolled, and production board is carried out to full-scale transverse and longitudinal Charpy impact test check at bar-shaped tension test ,-40 ℃, the results of property obtaining as shown in Table 2.
Table two is the results of property of embodiment:
Table two, performance table
Compare with conventional production methods, the E40 deck of boat that adopts TMCP technology to produce has better low-temperature flexibility and welding property, lower manufacturing cost and shorter production cycle.According to embodiments of the invention, can predict, in the situation that appointed condition allows, production operation is easy to carry out, and has the very strong possibility of applying.Especially along with the development of world economy, steel for ship structure demand constantly rises, particularly evident to the development trend of superstrength, special thick specification.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention but not restriction technologies scheme, although applicant has been described in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those are modified or are equal to replacement technical scheme of the present invention, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. a TMCP type E47 steel plate with good low-temperature toughness, is characterized in that, its chemical composition mass percent is: C:0.04～0.10%; Si:0.10～0.30%; Mn:1.20～1.60%; P≤0.018%; S≤0.010%; Alt:0.02～0.07%; Ni:0.10～0.40%; Cu:0.10～0.30%; Mo: 0.01～0.08%; Ti:0.01～0.02%; Nb:0.02～0.04%; V is 0.03～0.07%; Surplus is Fe and inevitable trace impurity.
2. the TMCP type E40 steel plate with good low-temperature toughness according to claim 1, it is characterized in that, C:0.04～0.10%, or Ni:0.10～0.40%, or Cu:0.10～0.30%, or Mo:0.01～0.08%, or Nb:0.02～0.04%, or V is 0.03～0.07%, the Pcm of above-mentioned chemical composition :≤0.20%.
3. according to the TMCP type E40 steel plate with good low-temperature toughness described in claim 1,2, it is characterized in that P :≤0.018%, and S :≤0.010%, as preferred P≤0.012%, S≤0.005%.
4. according to the TMCP type E40 steel plate with good low-temperature toughness described in claim 1-3, it is characterized in that, the thickness of steel plate is 10～70mm, and width is 1500 ~ 3800mm, and preferred thickness is 40 ~ 70mm, and width is 2200 ~ 3200mm.
5. according to the TMCP type E40 deck of boat described in claim 1-4, it is characterized in that-40 ℃ of impelling strength > 200J.
6. according to the manufacture method of the TMCP type E40 steel plate with good low-temperature toughness described in claim 1-4, comprising: 1), according to the component described in claim 1,2,3, smelt, obtain continuously cast bloom after continuous casting; 2), above-mentioned continuously cast bloom is reheated, roughing and finish rolling; 3), that the finished product after rolling is carried out to ACC is cooling, it is characterized in that:
Reheat in operation: reheat 1100～1180 ℃ of temperature; In roughing operation: the thickness of roughing feeding is 2.5～3.0 times of finished product thicknesses; In finish rolling operation: controlled rolling thickness is 2.5～3.0 times of finished product thicknesses, and controlled rolling temperature is 830～900 ℃, and finishing temperature is 790～850 ℃; In refrigerating work procedure: adopt ACC cooling, open 770～830 ℃ of cold temperature, 480～600 ℃ of red temperatures, open and rectify 500～650 ℃ of temperature, and water coolant is than (ratio of upper and lower cooling water inflow) 1:2.2～2.3.
7. the manufacture method with the TMCP type E40 steel plate of good low-temperature toughness according to claim 5, is characterized in that, in roughing operation, and deformation rate >=40% of continuously cast bloom.
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