CN102392193B - Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof - Google Patents
Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof Download PDFInfo
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Abstract
The invention which belongs to the technical field of steel concretely discloses an extra thick quenched and tempered steel plate for an ocean platform tooth bar and a production method thereof. The extra thick quenched and tempered steel plate for the ocean platform tooth bar comprises the following components, by weight, 0.14-0.18% of C, 0.15-0.35% of Si, 0.95-1.30% of Mn, equal to or less than 0.015% of P, equal to or less than 0.005% of S, 2.35-2.55% of Ni, 0.35-0.55% of Cr, 0.40-0.60% of Mo, 0.020-0.050% of Nb, 0.010-0.030% of Ti, 0.020-0.045% of total Al, and the balance Fe and inevitable impurities, and the thickness of the steel plate reaches 177.8mm. The extra thick quenched and tempered steel plate for the ocean platform tooth bar, which is prepared through carrying out steps of smelting by an electric furnace, steel ingot casting by a die, TMCP rolling, fully enclosed quenching and tempering by a well type heating furnace, and the like, has the advantages of high yield strength, good elongation, excellent Z-directional performance, good low temperature impact toughness, good layered tearing resistance, and low production cost.
Description
Technical field
The present invention relates to the iron and steel technical field, be specifically related to the thick hardening and tampering ocean platform tooth bar of a kind of spy steel plate and production method thereof.
Background technology
In recent years, to the continuous reinforcement of marine resources development dynamics, the development of oceanographic engineering steel for engineering mechanism purpose is swift and violent along with both at home and abroad.Existing market is also increasing to the demand of offshore platform steel plate, especially along with various countries one after another to the development of deep-sea drilling field, tooth bar for the manufacture of one of deep-sea self-elevating ocean platform essential elements, its large thickness, high strength, high tenacity trend are remarkable, and because its environment for use is special, very strict requirement has been proposed also for the anti-lamellar tearing performance of steel plate.The ocean platform tooth bar of producing at present with steel plate thickness generally all less than 150mm, thickness reaches 150mm and has the problems such as low-temperature impact work is unstable, the Z-direction performance is not good, thickness directional properties lack of homogeneity more when above, and therefore the above ocean platform tooth bar of thickness 150mm can't satisfy the service requirements of oceanographic engineering machinery with the delivery performance of steel plate at present.In addition, because existing ocean platform tooth bar is more with the precious metal that adds in steel plate, so production cost is higher.
Summary of the invention
The object of the present invention is to provide the thick hardening and tampering ocean platform tooth bar of a kind of spy steel plate.
The present invention also aims to provide the production method of the thick hardening and tampering ocean platform tooth bar of a kind of spy with steel plate.
In order to realize above purpose, the technical solution adopted in the present invention is: the thick hardening and tampering ocean platform tooth bar of a kind of spy steel plate, and this steel plate is comprised of the component of following weight percentage: C:0.14%～0.18%, Si:0.15%～0.35%, Mn:0.95%～1.30%, P≤0.015%, S≤0.005%, Ni:2.35%～2.55%, Cr:0.35%～0.55%, Mo:0.40%～0.60%, Nb:0.020%～0.050%, Ti:0.010%～0.030%, Al
Always: 0.020%～0.045%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
Preferably, special thick hardening and tampering ocean platform tooth bar forms with the component of steel plate by following weight percentage: C:0.14%～0.16%, Si:0.22%～0.30%, Mn:1.15%～1.20%, P≤0.012%, S≤0.002%, Ni:2.40%～2.50%, Cr:0.45%～0.55%, Mo:0.55%～0.57%, Nb:0.023%～0.030%, Ti:0.010%～0.015%, Al
Always: 0.025%～0.037%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
The thick hardening and tampering ocean platform tooth bar of a kind of spy production method of steel plate comprises the following steps:
(1) smelting technology: molten steel is sent into the refining of LF refining furnace afterwards first through electrosmelting, and liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1550～1570 ℃, cast afterwards, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 100～120 ℃/h, insulation when being heated to 1250～1270 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1050～1100 ℃, and finishing temperature is 930～960 ℃, and the single pass draught is 10%～25%, and the accumulative total draft is 60%～70%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 890～910 ℃, and finishing temperature is 810～830 ℃, and the single pass draught is 10%～27%, the accumulative total draft is 30%～40%, rolls rear water-cooled, 750～770 ℃ of leaving water temperature(LWT)s, make rough steel plate, the thickness of described rough steel plate is 178～180mm;
(4) flaw detection pretreatment technology: described rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descended cold bed to carry out stacking slow cooling afterwards and processed, and stacking was detected a flaw after de-stacking after 96 hours;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, described modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 905～915 ℃, and soaking time 1.8min/mm, the hardening mortise of described pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter water temp 〉=880 ℃, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 625～635 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, again through unsettled air cooling, makes special thick hardening and tampering ocean platform tooth bar steel plate after coming out of the stove, this steel plate is comprised of the component of following weight percentage: C:0.14%～0.18%, Si:0.15%～0.35%, Mn:0.95%～1.30%, P≤0.015%, S≤0.005%, Ni:2.35%～2.55%, Cr:0.35%～0.55%, Mo:0.40%～0.60%, Nb:0.020%～0.050%, Ti:0.010%～0.030%, Al
Always: 0.020%～0.045%, surplus is Fe and inevitable impurity.
Further, the vacuum tightness of the Fruit storage described in step (1) is 0～66.6Pa, and the vacuum hold-time is 20～45 minutes.
Pouring temperature when casting in step (1) is 1535～1545 ℃.
The thick hardening and tampering ocean platform tooth bar of spy provided by the invention simply is described below with the effect of each chemical composition in steel plate:
C makes a significant impact yield strength, tensile strength, the welding property of steel, and C can significantly improve the intensity of steel plate by the gap solid solution, but can affect welding property and the toughness of steel during the C too high levels;
Si is used as reductive agent and reductor in steelmaking process, simultaneously Si can play solution strengthening effect, but content can cause the toughness of steel to descend when surpassing 0.5%, reduces the welding property of steel;
Mn can increase toughness, intensity and the hardness of steel, improves the hardening capacity of steel, improves the hot workability of steel, and cheap, can reduce the production cost of steel plate, but can weaken the resistance to corrosion of steel during the Mn too high levels, reduces welding property;
P and S are the harmful element in steel in the ordinary course of things, can increase the fragility of steel, and P degenerates the welding property of steel, reduce plasticity, and cold-bending property is degenerated; S reduces ductility and the toughness of steel, is forging and can cause crackle when rolling, so should reduce P and the content of S in steel as far as possible;
Intensity and plasticity the be improved effect of Ni to steel plate, increase rate to low-temperature impact toughness is larger, this is only to form sosoloid in steel due to Ni, and solution strengthening effect is not obvious, mainly to improve material plasticity by increasing the lattice slip plane when the viscous deformation, Ni also can improve the hardening capacity of steel alloy, and can improve steel toughness at low temperatures, and ductile-brittle transition temperature is descended;
Cr all has considerable influence to intensity, plasticity and the low-temperature impact toughness of steel plate, this be due to Cr can solid solution in ferrite and austenite, again can with steel in C form multiple carbide.The Cr solid solution can improve the hardening capacity of steel when austenite, when Cr and C form complicated carbide and in steel during disperse educt, can play dispersion-strengthened action, improve the effect of hardening capacity and solution strengthening due to Cr, can improve intensity and the hardness of steel under as-heat-treated condition, thereby be widely used in structural lowalloy steel, but Cr also makes the plasticity of steel decrease when playing strengthening effect in steel, and increase temper brittleness, therefore can according to the requirement to strong plasticity, determine suitable Cr content;
Mo all improves a lot to armor plate strength, plasticity and low-temperature impact toughness, this is the C curve of steel is moved to right due to the Mo solid solution when ferrite and the austenite, thereby significantly improve the hardening capacity of steel, and Mo can significantly improve the recrystallization temperature of steel, the raising temper resistance, can obtain the compact grained sorbite after modified, obdurability is improved, when forming the carbide of Mo, can play dispersion-strengthened action, therefore increase with Mo content, obdurability is improved;
Adding of Nb is in order to promote the grain refining of steel rolling attitude microstructure, simultaneously can improve intensity and toughness, Nb can be in During Controlled Rolling by suppressing austenite recrystallization refinement microstructure effectively, and precipitation strength matrix, Nb can reduce superheated susceptivity and the temper brittleness of steel, in welding process, and the alligatoring of austenite crystal when the segregation of Nb atom and separating out can hinder heating, and guarantee to obtain more tiny heat affected zone tissue after welding, improve welding property;
Ti is good reductor, and Ti can form the carbide of Ti with the C element, have good grain refining effect;
Al is reductor commonly used in steel, but adds a small amount of Al crystal grain thinning, raising impelling strength in steel, and Al also has oxidation-resistance and corrosion resistance, and the Al too high levels affects hot workability, welding property and the machinability of steel.
The thick hardening and tampering ocean platform tooth bar of spy provided by the invention is reasonable with the chemical composition design of steel plate, and the precious metal that uses is few, has reduced the production cost of steel plate.For further reducing the noble alloy consumption, reduce production costs, the thick hardening and tampering ocean platform tooth bar of spy provided by the invention has adopted extremely strong quenching quenching equipment---pit furnace with the production method of steel plate, opened up a new thermal treatment process, improve the mechanical property of steel plate, reached the service requirements of steel plate.
The thick hardening and tampering ocean platform tooth bar of spy provided by the invention with the production method of steel plate be electrosmelting, refining, vacuumize, static ingot, TMCP are rolling, the operational path of pit furnace fully-closed modifier treatment, guaranteed rational compression ratio when rolling, the steel ingot interior solid that obtains simultaneously, steel is pure; Steel ingot adopts the steel rolling technique of drying in the air, and has solved the mill milling insufficient pressure and the uneven problem of coarse grains that causes, and the steel plate of production has good over-all properties, and the steel plate unit elongation has sizable rich amount, and Offshore Platform Engineering has a extensive future; Adopt the thermal treatment process of pit furnace, have the advantages that heat-up rate is fast, stable and uniform is strong, the steel plate overall performance is reached unanimity, on thickness direction, performance difference is little, the steel plate homogeneous microstructure, the refinement that obtain.The thickness of the finished steel plate that the present invention makes reaches 177.8mm, and the good mechanical properties of finished steel plate has good tissue, over-all properties and welding property, and UT (Ultrasonic Testing) shows that internal quality of steel plate is good, reaches the requirement of ASTMA578/A578M standard C level.
The thick hardening and tampering ocean platform tooth bar of spy provided by the invention is high with the steel plate yield strength, good percentage elongation, Z-direction excellent property, low-temperature impact-resistant toughness and anti-lamellar tearing functional.The steel of steel plate is pure, P≤0.015%, S≤0.005%; Low-temperature impact is good, and the ballistic work of thickness 1/4 position-37 ℃ and 1/2 position-27 ℃ is all more than 70J; Thickness (Z-direction) stretching relative reduction in area is high, and relative reduction in area is more than 40%; Unit elongation is more than 16%.
Embodiment
Embodiment 1
The special thick hardening and tampering ocean platform tooth bar steel plate that the present embodiment provides, component by following weight percentage forms: C:0.14%, Si:0.22%, Mn:1.15%, P:0.012%, S:0.002%, Ni:2.40%, Cr:0.45%, Mo:0.55%, Nb:0.020%, Ti:0.030%, Al
Always: 0.045%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of the present embodiment production method of steel plate comprises the following steps:
(1) smelting technology: molten steel is first through electrosmelting, send into afterwards the refining of LF refining furnace, liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1550 ℃, the vacuum tightness of Fruit storage is 66.6Pa, the vacuum hold-time is 25 minutes, cast afterwards, the pouring temperature during casting is 1535 ℃, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 120 ℃/h, insulation when being heated to 1270 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1100 ℃, and finishing temperature is 960 ℃, and the single pass draught is 25%, and the accumulative total draft is 70%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 910 ℃, and finishing temperature is 830 ℃, and the single pass draught is 10%, and the accumulative total draft is 30%, rolls rear water-cooled, and 770 ℃ of leaving water temperature(LWT)s make rough steel plate, and the thickness of rough steel plate is 178mm;
(4) flaw detection pretreatment technology: rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descend afterwards cold bed to carry out stacking slow cooling and process, stacking carried out UT (Ultrasonic Testing) after 96 hours after de-stacking, UT (Ultrasonic Testing) shows that internal quality of steel plate is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 905 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 635 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, and the rear overhang of coming out of the stove is absolutely empty cold, makes special thick hardening and tampering ocean platform tooth bar steel plate.
The mechanical property of the steel plate of the present embodiment: yield strength 735MPa, tensile strength 850MPa, thickness 1/2 position-27 ℃ ballistic work 112J, 128J, 131J, 1/4 position-37 ℃ ballistic work 110J, 101J, 127J, the Z-direction relative reduction in area is 45%, 43%, 46%, unit elongation is 21.0%, and low-temperature impact-resistant toughness and the anti-lamellar tearing of this steel plate are functional.
Embodiment 2
The special thick hardening and tampering ocean platform tooth bar steel plate that the present embodiment provides, component by following weight percentage forms: C:0.18%, Si:0.15%, Mn:1.20%, P:0.015%, S:0.005%, Ni:2.45%, Cr:0.50%, Mo:0.57%, Nb:0.023%, Ti:0.010%, Al
Always: 0.020%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of the present embodiment production method of steel plate comprises the following steps:
(1) smelting technology: molten steel is first through electrosmelting, send into afterwards the refining of LF refining furnace, liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1570 ℃, the vacuum tightness of Fruit storage is 67Pa, the vacuum hold-time is 20 minutes, cast afterwards, the pouring temperature during casting is 1545 ℃, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 100 ℃/h, insulation when being heated to 1250 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1050 ℃, and finishing temperature is 930 ℃, and the single pass draught is 10%, and the accumulative total draft is 60%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 890 ℃, and finishing temperature is 810 ℃, and the single pass draught is 27%, and the accumulative total draft is 40%, rolls rear water-cooled, and 750 ℃ of leaving water temperature(LWT)s make rough steel plate, and the thickness of rough steel plate is 180mm;
(4) flaw detection pretreatment technology: rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descend afterwards cold bed to carry out stacking slow cooling and process, stacking carried out UT (Ultrasonic Testing) after 96 hours after de-stacking, UT (Ultrasonic Testing) shows that internal quality of steel plate is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 915 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter 900 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 625 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, and the rear overhang of coming out of the stove is absolutely empty cold, makes special thick hardening and tampering ocean platform tooth bar steel plate.
The mechanical property of the steel plate of the present embodiment: yield strength 745MPa, tensile strength 835MPa, thickness 1/2 position-27 ℃ ballistic work 128J, 118J, 116J, 1/4 position-37 ℃ ballistic work 127J, 103J, 131J, the Z-direction relative reduction in area is 47%, 49%, 51%, unit elongation is 19.5%, and low-temperature impact-resistant toughness and the anti-lamellar tearing of this steel plate are functional.
Embodiment 3
The special thick hardening and tampering ocean platform tooth bar steel plate that the present embodiment provides, component by following weight percentage forms: C:0.17%, Si:0.35%, Mn:0.95%, P:0.010%, S:0.002%, Ni:2.55%, Cr:0.35%, Mo:0.60%, Nb:0.050%, Ti:0.015%, Al
Always: 0.025%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of the present embodiment production method of steel plate comprises the following steps:
(1) smelting technology: molten steel is first through electrosmelting, send into afterwards the refining of LF refining furnace, liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1560 ℃, the vacuum tightness of Fruit storage is 67Pa, the vacuum hold-time is 25 minutes, cast afterwards, the pouring temperature during casting is 1540 ℃, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 110 ℃/h, insulation when being heated to 1260 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1000 ℃, and finishing temperature is 950 ℃, and the single pass draught is 15%, and the accumulative total draft is 70%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 900 ℃, and finishing temperature is 820 ℃, and the single pass draught is 20%, and the accumulative total draft is 30%, rolls rear water-cooled, and 760 ℃ of leaving water temperature(LWT)s make rough steel plate, and the thickness of rough steel plate is 178mm;
(4) flaw detection pretreatment technology: rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descend afterwards cold bed to carry out stacking slow cooling and process, stacking carried out UT (Ultrasonic Testing) after 96 hours after de-stacking, UT (Ultrasonic Testing) shows that internal quality of steel plate is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 910 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 630 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, and the rear overhang of coming out of the stove is absolutely empty cold, makes special thick hardening and tampering ocean platform tooth bar steel plate.
The mechanical property of the steel plate of the present embodiment: yield strength 725MPa, tensile strength 855MPa, thickness 1/2 position-27 ℃ ballistic work 133J, 123J, 119J, 1/4 position-37 ℃ ballistic work 121J, 98J, 132J, the Z-direction relative reduction in area is 51%, 43%, 45%, unit elongation is 21.0%, and low-temperature impact-resistant toughness and the anti-lamellar tearing of this steel plate are functional.
Embodiment 4
The special thick hardening and tampering ocean platform tooth bar steel plate that the present embodiment provides, component by following weight percentage forms: C:0.16%, Si:0.30%, Mn:1.30%, P:0.009%, S:0.002%, Ni:2.50%, Cr:0.55%, Mo:0.40%, Nb:0.030%, Ti:0.018%, Al
Always: 0.037%, surplus is Fe and inevitable impurity.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of the present embodiment production method of steel plate comprises the following steps:
(1) smelting technology: molten steel is first through electrosmelting, send into afterwards the refining of LF refining furnace, liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1560 ℃, the vacuum tightness of Fruit storage is 67Pa, the vacuum hold-time is 25 minutes, cast afterwards, the pouring temperature during casting is 1540 ℃, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 110 ℃/h, insulation when being heated to 1260 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1080 ℃, and finishing temperature is 950 ℃, and the single pass draught is 15%, and the accumulative total draft is 70%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 890 ℃, and finishing temperature is 820 ℃, and the single pass draught is 20%, and the accumulative total draft is 30%, rolls rear water-cooled, and 760 ℃ of leaving water temperature(LWT)s make rough steel plate, and the thickness of rough steel plate is 178mm;
(4) flaw detection pretreatment technology: rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descend afterwards cold bed to carry out stacking slow cooling and process, stacking carried out UT (Ultrasonic Testing) after 96 hours after de-stacking, UT (Ultrasonic Testing) shows that internal quality of steel plate is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 910 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 630 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, and the rear overhang of coming out of the stove is absolutely empty cold, makes special thick hardening and tampering ocean platform tooth bar steel plate.
The mechanical property of the steel plate of the present embodiment: yield strength 740MPa, tensile strength 860MPa, thickness 1/2 position-27 ℃ ballistic work 109J, 136J, 118J, 1/4 position-37 ℃ ballistic work 116J, 103J, 130J, the Z-direction relative reduction in area is 46%, 43%, 49%, unit elongation is 20.5%, and low-temperature impact-resistant toughness and the anti-lamellar tearing of this steel plate are functional.
Claims (5)
1. the production method of the thick hardening and tampering ocean platform tooth bar use of a spy steel plate, is characterized in that, comprises the following steps:
(1) smelting technology: molten steel is sent into the refining of LF refining furnace afterwards first through electrosmelting, and liquid steel temperature changes the VD stove over to and carries out Fruit storage when being 1550～1570 ℃, cast afterwards, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and in the time of below 1000 ℃, heat-up rate is 100～120 ℃/h, insulation when being heated to 1250～1270 ℃, and be 9min/cm total heat-up time;
(3) rolling technology: adopt TMCP type rolling technology, the start rolling temperature of I stage rolling is 1050～1100 ℃, and finishing temperature is 930～960 ℃, and the single pass draught is 10%～25%, and the accumulative total draft is 60%～70%, and steel thickness 240mm dries in the air; The start rolling temperature of II stage rolling is 890～910 ℃, and finishing temperature is 810～830 ℃, and the single pass draught is 10%～27%, the accumulative total draft is 30%～40%, rolls rear water-cooled, 750～770 ℃ of leaving water temperature(LWT)s, make rough steel plate, the thickness of described rough steel plate is 178～180mm;
(4) flaw detection pretreatment technology: described rough steel plate was gone up the cold bed air cooling 2 hours after aligning, descended cold bed to carry out stacking slow cooling afterwards and processed, and stacking was detected a flaw after de-stacking after 96 hours;
(5) thermal treatment process: the steel plate after flaw detection carries out modifier treatment in pit furnace, described modifier treatment comprises quenching technology and tempering process; Quenching technology is: 500 ℃ of steel plates enter stove, heat up 5 hours to 905～915 ℃, and soaking time 1.8min/mm, the hardening mortise of described pit furnace be at front 1 hour ON cycle water of tapping, steel plate enter water temp 〉=880 ℃, 2.5 hours cooling times of entry; Tempering process is: 300 ℃ of steel plates enter stove, heated up 4 hours to 625～635 ℃, and soaking time 1.6min/mm; Steel plate is come out of the stove afterwards, after coming out of the stove again through unsettled air cooling, make special thick hardening and tampering ocean platform tooth bar steel plate, this steel plate is comprised of the component of following weight percentage: C:0.14%～0.18%, Si:0.15%～0.35%, Mn:0.95%～1.30%, P≤0.015%, S≤0.005%, Ni:2.35%～2.55%, Cr:0.35%～0.55%, Mo:0.40%～0.60%, Nb:0.020%～0.050%, Ti:0.010%～0.030%, Al is total: 0.020%～0.045%, and surplus is Fe and inevitable impurity.
2. the thick hardening and tampering ocean platform tooth bar of spy according to claim 1 with the production method of steel plate, is characterized in that, the vacuum tightness of the Fruit storage described in step (1) is 0～66.6Pa, and the vacuum hold-time is 20～45 minutes.
3. the thick hardening and tampering ocean platform tooth bar of spy according to claim 1 with the production method of steel plate, is characterized in that, the pouring temperature when casting in step (1) is 1535～1545 ℃.
4. one kind is adopted the prepared hardening and tampering ocean platform tooth bar steel plate of preparation method as claimed in claim 1.
5. hardening and tampering ocean platform tooth bar steel plate according to claim 4, is characterized in that, the thickness of this steel plate is 177.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110358725 CN102392193B (en) | 2011-11-10 | 2011-11-10 | Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110358725 CN102392193B (en) | 2011-11-10 | 2011-11-10 | Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102392193A CN102392193A (en) | 2012-03-28 |
| CN102392193B true CN102392193B (en) | 2013-06-19 |
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| CN103014283B (en) * | 2012-12-26 | 2014-05-28 | 首钢总公司 | Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet |
| CN103305768A (en) * | 2013-06-20 | 2013-09-18 | 舞阳钢铁有限责任公司 | Steel for low-carbon equivalent seawater corrosion resisting ocean platform rack and production method of steel |
| CN103695803B (en) * | 2013-12-19 | 2015-12-30 | 江阴兴澄特种钢铁有限公司 | The heavy thickness rack steel that low-carbon-equivalent low-temperature uses and manufacture method thereof |
| CN103725986B (en) * | 2013-12-19 | 2015-12-30 | 江阴兴澄特种钢铁有限公司 | The special thick rack steel plate of the high tenacity F level used under low temperature and manufacture method thereof |
| CN104962799A (en) * | 2015-06-17 | 2015-10-07 | 柳州金特新型耐磨材料股份有限公司 | Production technology of wear-resisting rack structural steel |
| CN111041329B (en) * | 2019-12-25 | 2021-11-12 | 舞阳钢铁有限责任公司 | High-strength high-toughness steel plate for ocean engineering and production method thereof |
| CN111826586A (en) * | 2020-06-15 | 2020-10-27 | 舞阳钢铁有限责任公司 | Low-cost large-thickness rack steel and production method thereof |
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| JP2002241837A (en) * | 2001-02-14 | 2002-08-28 | Nkk Corp | Method for producing high toughness and high tensile strength steel |
| JP2002256380A (en) * | 2001-03-06 | 2002-09-11 | Sumitomo Metal Ind Ltd | Thick high tensile strength steel plate having excellent brittle crack propagation arrest property and weld zone property and production method therefor |
| JP4197459B2 (en) * | 2003-05-27 | 2008-12-17 | 株式会社ジェイテクト | Steel bar for steering rack |
| JP2010144226A (en) * | 2008-12-19 | 2010-07-01 | Sumitomo Metal Ind Ltd | Rolled steel material to be induction-hardened and method for manufacturing the same |
| CN101602078B (en) * | 2009-07-03 | 2010-12-01 | 马景怡 | Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate |
| CN101709425B (en) * | 2009-12-26 | 2011-06-29 | 舞阳钢铁有限责任公司 | High-strength steel plate for super-thick 80,000-ton large-scale forging press brackets, and production method thereof |
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