CN102392193A - 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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- CN102392193A CN102392193A CN2011103587254A CN201110358725A CN102392193A CN 102392193 A CN102392193 A CN 102392193A CN 2011103587254 A CN2011103587254 A CN 2011103587254A CN 201110358725 A CN201110358725 A CN 201110358725A CN 102392193 A CN102392193 A CN 102392193A
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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 with steel plate and working 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 with the demand of steel plate to ocean platform; Especially along with various countries develop to the deep-sea drilling field one after another; Be used to make the tooth bar of one of deep-sea self-elevating ocean platform essential elements; Its big thickness, HS, H.T. trend are remarkable, and because its environment for use is special, and the anti-lamellar tearing performance of steel plate has also been proposed very strict requirement.The ocean platform tooth bar of producing at present with steel plate thickness generally all less than 150mm; Thickness reaches 150mm and has unstable, the problems such as Z is not good to performance, thickness directional properties lack of homogeneity of low-temperature impact work more when above, and therefore the above ocean platform tooth bar of thickness 150mm can't satisfy the mechanical request for utilization of oceanographic engineering 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 the 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 to use steel plate.
The present invention also aims to provide the working 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 scheme that the present invention adopted is: the thick hardening and tampering ocean platform tooth bar of a kind of spy is used steel plate, and this steel plate is made up of following components in weight percentage content: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
Preferably, special thick hardening and tampering ocean platform tooth bar is made up of following components in weight percentage content with steel plate: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
The thick hardening and tampering ocean platform tooth bar of a kind of spy may further comprise the steps with the working method of steel plate:
(1) smelting technology: molten steel is sent into the refining of LF refining furnace afterwards earlier through electrosmelting, and liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1550～1570 ℃, cast afterwards, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and heat-up rate is 100～120 ℃/h in the time of below 1000 ℃, 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 the back water-cooled, 750～770 ℃ of leaving water temperature(LWT)s; Make rough steel plate, the thickness of said rough steel plate is 178～180mm;
(4) flaw detection pretreatment technology: said rough steel plate was gone up the cold bed air cooling 2 hours after aligning, and descended cold bed to carry out stacking slow cooling afterwards and handled, and stacking was detected a flaw after the de-stacking after 96 hours;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, said modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 905～915 ℃, and soaking time 1.8min/mm, the hardening mortise of said pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into water temp>=880 ℃, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 625～635 ℃; Steel plate is come out of the stove afterwards, again through unsettled air cooling, makes special thick hardening and tampering ocean platform tooth bar and uses steel plate after coming out of the stove, and this steel plate is made up of following components in weight percentage content: 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 unavoidable impurities.
Further, the vacuum tightness that the vacuum outgas described in the step (1) is handled is 0～66.6Pa, and the vacuum hold-time is 20～45 minutes.
Pouring temperature when casting in the step (1) is 1535～1545 ℃.
The thick hardening and tampering ocean platform tooth bar of spy provided by the invention is following with the effect brief account of each chemical ingredients in the steel plate:
C produces remarkably influenced to the ys of steel, tensile strength, welding property, and C can significantly improve the intensity of steel plate through the gap solid solution, but can influence the welding property and the toughness of steel during the C too high levels;
Si is used as reductive agent and reductor in steelmaking process, Si can play the solution strengthening effect simultaneously, but content surpasses at 0.5% o'clock, can cause the toughness of steel to descend, and 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 the 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 the ductility and the toughness of steel, can cause crackle when rolling forging, so should reduce P and the content of S in steel as far as possible;
Ni is to the intensity and the plasticity effect of being improved of steel plate; Increase rate to low-temperature impact toughness is bigger, and this is because Ni only forms sosoloid in steel, and the solution strengthening effect is not obvious; Mainly be to improve material plasticity through 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 since Cr can solid solution in ferritic and austenite, can form multiple carbide with the C in the steel again.The Cr solid solution can improve the hardening capacity of steel when austenite, when Cr and C form complicated carbide and disperse is separated out in steel, can play dispersion-strengthened action; Because Cr improves the effect of hardening capacity and solution strengthening, can improve intensity and the hardness of steel under as-heat-treated condition, thereby be widely used in the structural low; But Cr also makes the plasticity of steel decrease when in steel, playing strengthening effect; And increase temper brittleness, therefore can confirm appropriate C r content according to requirement to strong plasticity;
Mo all improves a lot to armor plate strength, plasticity and low-temperature impact toughness, and this is because the Mo solid solution can make the C curve of steel move to right when ferritic and austenite, thereby significantly improves the hardening capacity of steel; And Mo can significantly improve the recrystallization temperature of steel, improves 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;
The adding of Nb is in order to promote the grain refining of steel rolling attitude microstructure, can improve intensity and toughness simultaneously that Nb can be through suppressing austenite recrystallization refinement microstructure effectively in the controlled rolling process; And precipitation strength matrix; Nb can reduce the superheated susceptivity and the temper brittleness of steel, in the welding process, and the alligatoring that gathers and separate out austenite crystal in the time of can hindering heating partially of Nb atom; And guarantee to obtain more tiny heat affected zone tissue after the welding, improve welding property;
Ti is good reductor, and Ti can form the carbide of Ti with the C element, has good grain refining effect;
Al is a reductor commonly used in the steel, but adds a spot of Al crystal grain thinning in the steel, improve impelling strength, and Al also has oxidation-resistance and corrosion resistance, and the Al too high levels then influences 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 working method of steel plate; Open up a new thermal treatment process, improved the mechanical property of steel plate, reached the request for utilization of steel plate.
The working method that the thick hardening and tampering ocean platform tooth bar of spy provided by the invention uses steel plate as 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 technology of drying in the air, and has solved the mill milling insufficient pressure and the thick uneven problem of crystal grain that causes, and the steel plate of production has excellent comprehensive performances, and the steel plate unit elongation has sizable rich amount, and the ocean platform future in engineering applications is wide; Adopt the thermal treatment process of pit furnace, have the advantages that heat-up rate is fast, stable and uniform property is strong, the steel plate overall performance is reached unanimity, performance difference is little on the thickness direction, the steel plate homogeneous microstructure, the refinement that obtain.The thickness of the finished product steel plate that the present invention makes reaches 177.8mm, and the good mechanical properties of finished product steel plate has favorable tissue, over-all properties and welding property, and UT shows that the steel plate internal soundness 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 functional to excellent property, low-temperature impact-resistant toughness and anti-lamellar tearing with steel plate ys height, good percentage elongation, Z.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 to) 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 that present embodiment provides is used steel plate, is made up of following components in weight percentage content: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of present embodiment may further comprise the steps with the working method of steel plate:
(1) smelting technology: molten steel is earlier through electrosmelting; Send into the refining of LF refining furnace afterwards, liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1550 ℃, and the vacuum tightness that vacuum outgas is handled 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 heat-up rate is 120 ℃/h in the time of below 1000 ℃, 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 the back 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 handle, stacking carried out UT after 96 hours after the de-stacking; UT shows that the steel plate internal soundness is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 905 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 635 ℃; 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 and uses steel plate.
The mechanical property of the steel plate of present embodiment: ys 735MPa; Tensile strength 850MPa; Thickness 1/2 position-27 ℃ ballistic work 112J, 128J, 131J, 1/4 position-37 ℃ ballistic work 110J, 101J, 127J, Z is 45%, 43%, 46% to relative reduction in area; Unit elongation is 21.0%, and the 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 that present embodiment provides is used steel plate, is made up of following components in weight percentage content: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of present embodiment may further comprise the steps with the working method of steel plate:
(1) smelting technology: molten steel is earlier through electrosmelting; Send into the refining of LF refining furnace afterwards, liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1570 ℃, and the vacuum tightness that vacuum outgas is handled 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 heat-up rate is 100 ℃/h in the time of below 1000 ℃, 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 the back 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 handle, stacking carried out UT after 96 hours after the de-stacking; UT shows that the steel plate internal soundness is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 915 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into 900 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 625 ℃; 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 and uses steel plate.
The mechanical property of the steel plate of present embodiment: ys 745MPa; Tensile strength 835MPa; Thickness 1/2 position-27 ℃ ballistic work 128J, 118J, 116J, 1/4 position-37 ℃ ballistic work 127J, 103J, 131J, Z is 47%, 49%, 51% to relative reduction in area; Unit elongation is 19.5%, and the 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 that present embodiment provides is used steel plate, is made up of following components in weight percentage content: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of present embodiment may further comprise the steps with the working method of steel plate:
(1) smelting technology: molten steel is earlier through electrosmelting; Send into the refining of LF refining furnace afterwards, liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1560 ℃, and the vacuum tightness that vacuum outgas is handled 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 heat-up rate is 110 ℃/h in the time of below 1000 ℃, 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 the back 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 handle, stacking carried out UT after 96 hours after the de-stacking; UT shows that the steel plate internal soundness is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 910 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 630 ℃; 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 and uses steel plate.
The mechanical property of the steel plate of present embodiment: ys 725MPa; Tensile strength 855MPa; Thickness 1/2 position-27 ℃ ballistic work 133J, 123J, 119J, 1/4 position-37 ℃ ballistic work 121J, 98J, 132J, Z is 51%, 43%, 45% to relative reduction in area; Unit elongation is 21.0%, and the 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 that present embodiment provides is used steel plate, is made up of following components in weight percentage content: 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 unavoidable impurities.The thickness of this steel plate is 177.8mm.
The special thick hardening and tampering ocean platform tooth bar of present embodiment may further comprise the steps with the working method of steel plate:
(1) smelting technology: molten steel is earlier through electrosmelting; Send into the refining of LF refining furnace afterwards, liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1560 ℃, and the vacuum tightness that vacuum outgas is handled 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 heat-up rate is 110 ℃/h in the time of below 1000 ℃, 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 the back 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 handle, stacking carried out UT after 96 hours after the de-stacking; UT shows that the steel plate internal soundness is good, reaches ASTMA578/A578M standard C level;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 910 ℃, and soaking time 1.8min/mm, the hardening mortise of pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into 880 ℃ of water temps, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 630 ℃; 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 and uses steel plate.
The mechanical property of the steel plate of present embodiment: ys 740MPa; Tensile strength 860MPa; Thickness 1/2 position-27 ℃ ballistic work 109J, 136J, 118J, 1/4 position-37 ℃ ballistic work 116J, 103J, 130J, Z is 46%, 43%, 49% to relative reduction in area; Unit elongation is 20.5%, and the low-temperature impact-resistant toughness and the anti-lamellar tearing of this steel plate are functional.
Claims (5)
1. the thick hardening and tampering ocean platform tooth bar of spy is used steel plate, it is characterized in that this steel plate is made up of following components in weight percentage content: 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 unavoidable impurities.
2. the thick hardening and tampering ocean platform tooth bar of spy according to claim 1 is used steel plate, it is characterized in that, the thickness of this steel plate is 177.8mm.
3. the thick hardening and tampering ocean platform tooth bar of spy is characterized in that with the working method of steel plate, may further comprise the steps:
(1) smelting technology: molten steel is sent into the refining of LF refining furnace afterwards earlier through electrosmelting, and liquid steel temperature changes the VD stove over to and carries out the vacuum outgas processing when being 1550～1570 ℃, cast afterwards, obtains steel ingot;
(2) heating process: steel ingot is carried out heat treated, and heat-up rate is 100～120 ℃/h in the time of below 1000 ℃, 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 the back water-cooled, 750～770 ℃ of leaving water temperature(LWT)s; Make rough steel plate, the thickness of said rough steel plate is 178～180mm;
(4) flaw detection pretreatment technology: said rough steel plate was gone up the cold bed air cooling 2 hours after aligning, and descended cold bed to carry out stacking slow cooling afterwards and handled, and stacking was detected a flaw after the de-stacking after 96 hours;
(5) thermal treatment process: the steel plate after the flaw detection carries out modifier treatment in pit furnace, said modifier treatment comprises quenching technology and tempering process; Quenching technology is: steel plate is gone into stove for 500 ℃, heats up 5 hours to 905～915 ℃, and soaking time 1.8min/mm, the hardening mortise of said pit furnace be at preceding 1 hour ON cycle water of tapping, steel plate go into water temp>=880 ℃, 2.5 hours cooling times of entry; Tempering process is: steel plate is gone into stove for 300 ℃, heats up soaking time 1.6min/mm 4 hours to 625～635 ℃; Steel plate is come out of the stove afterwards, again through unsettled air cooling, makes special thick hardening and tampering ocean platform tooth bar and uses steel plate after coming out of the stove, and this steel plate is made up of following components in weight percentage content: 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 unavoidable impurities.
4. the thick hardening and tampering ocean platform tooth bar of spy according to claim 3 is characterized in that with the working method of steel plate the vacuum tightness that the vacuum outgas described in the step (1) is handled is 0～66.6Pa, and the vacuum hold-time is 20～45 minutes.
5. the thick hardening and tampering ocean platform tooth bar of spy according to claim 3 is characterized in that with the working method of steel plate the pouring temperature when casting in the step (1) is 1535～1545 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014283A (en) * | 2012-12-26 | 2013-04-03 | 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 |
| CN103695803A (en) * | 2013-12-19 | 2014-04-02 | 江阴兴澄特种钢铁有限公司 | Low-carbon-equivalent low-temperature-usable high-thickness toothed rack steel and manufacturing method thereof |
| CN103725986A (en) * | 2013-12-19 | 2014-04-16 | 江阴兴澄特种钢铁有限公司 | High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate |
| 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 |
| CN111041329A (en) * | 2019-12-25 | 2020-04-21 | 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1791696A (en) * | 2003-05-27 | 2006-06-21 | 光洋精工株式会社 | Steel bar for steering rack, method for producing the same, and steering rack using the same |
| CN101602078A (en) * | 2009-07-03 | 2009-12-16 | 马景怡 | Make the method for section steel with high strength and high toughness with hot rolled steel plate |
| CN101709425A (en) * | 2009-12-26 | 2010-05-19 | 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 |
| 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 |
-
2011
- 2011-11-10 CN CN 201110358725 patent/CN102392193B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1791696A (en) * | 2003-05-27 | 2006-06-21 | 光洋精工株式会社 | Steel bar for steering rack, method for producing the same, and steering rack using the same |
| 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 |
| CN101602078A (en) * | 2009-07-03 | 2009-12-16 | 马景怡 | Make the method for section steel with high strength and high toughness with hot rolled steel plate |
| CN101709425A (en) * | 2009-12-26 | 2010-05-19 | 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 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014283A (en) * | 2012-12-26 | 2013-04-03 | 首钢总公司 | Manufacture method of extremely-thick steel plate for hydropower station through continuous-cast billet |
| 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 |
| CN103695803A (en) * | 2013-12-19 | 2014-04-02 | 江阴兴澄特种钢铁有限公司 | Low-carbon-equivalent low-temperature-usable high-thickness toothed rack steel and manufacturing method thereof |
| CN103725986A (en) * | 2013-12-19 | 2014-04-16 | 江阴兴澄特种钢铁有限公司 | High-ductility Class F extra thick rack steel plate used at low temperature and manufacturing method of steel plate |
| 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 |
| CN111041329A (en) * | 2019-12-25 | 2020-04-21 | 舞阳钢铁有限责任公司 | High-strength high-toughness steel plate for ocean engineering and production method thereof |
| 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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