CN101748346B - High-grade wear-resistant steel plate and production method thereof - Google Patents
High-grade wear-resistant steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a high-grade wear-resistant steel plate. The steel plate comprises the following components in percentage by mass: less than or equal to 0.26 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.30 percent of Ni, less than or equal to 1.50 percent of Cr, less than or equal to 0.06 percent of Nb, 0.02 to 0.06 percent of Al, less than or equal to 0.03 percent of Ti, less than or equal to 0.50 percent of Mo, less than or equal to 0.08 percent of V, less than or equal to 0.004 percent of B, and the balance of Fe and inevitable impurities. A method for producing the steel plate comprises smelting, casting, heating, rolling, straightening, shot blasting, quenching, heat treatment, cutting and other process steps. The steel plate has the advantages of steel purity, high strength, high hardness, good low temperature toughness, good weldability, good processability, good cold bending property, large steel plate thickness, good plate cut, little noble metal added to the steel plate and low cost. The steel plate can be widely used in the industry of manufacturing mining, engineering, metallurgical and other machinery with broad application prospects.
Description
Technical field
The invention belongs to the smelting steel technical field, be specifically related to a kind of high-grade wear-resistant steel plate and working method thereof.
Background technology
Along with the fast development of economic construction, market increases the increasing demand of high-strength high hardness wear-resisting steel plate, especially industries such as coal mine machinery, engineering machinery, metallurgical machinery, road building machine and mining machinery.There is the low problem of hardness rank in present wear-resisting steel plate, can not reach request for utilization, and its obdurability, weldability can be also poor.
Summary of the invention
The object of the present invention is to provide a kind of high-grade wear-resistant steel plate.
The present invention also aims to provide a kind of working method of high-grade wear-resistant steel plate.
In order to realize above purpose; The technical scheme that the present invention adopted is: a kind of high-grade wear-resistant steel plate; The composition quality per-cent of said steel plate is: C: Si≤0.26%: Mn≤0.50%: P≤1.60%: S≤0.015% :≤0.005%, Ni:0.10%～0.30%, Cr: Nb≤1.50% :≤0.06%, Al:0.02%～0.06%, Ti: Mo≤0.03%: V≤0.50%: B≤0.08% :≤0.004%, and all the other are Fe and inevitable impurity.
Further; The composition quality per-cent of high-grade wear-resistant steel plate is: C:0.19%～0.23%, Si:0.30%～0.40%, Mn:1.20%～1.30%, P: S≤0.015% :≤0.005%, Ni:0.18%～0.26%, V:0.04%～0.05%, Nb:0.019%～0.026%, Al:0.020%～0.045%, Cr:0.60%～0.70%, Mo:0.23%～0.30%, Ti:0.017%～0.024%, B:0.0015%～0.0027%, all the other are Fe and inevitable impurity.
A kind of working method of high-grade wear-resistant steel plate comprises the steps:
(1) smelting technology: will contain mass percent is: C: Si≤0.26%: Mn≤0.50%: P≤1.60%: S≤0.015% :≤0.005%, Ni:0.10%～0.30%, Cr: Nb≤1.50% :≤0.06%, Al:0.02%～0.06%, Ti: Mo≤0.03%: V≤0.50%: B≤0.08%: the molten steel of≤0.004% composition is sent into the refining of LF refining furnace behind electrosmelting; Feed 400～500 meters on Al line; After refining finishes; The vacuum-treat of bull ladle VD stove; Add the SiCa piece before the vacuum, vacuum tightness 0～0.5 torr destroys vacuum when vacuum keeps 15～25 minutes;
(2) casting process: temperature remains 1530～1540 ℃ after the vacuum breaking, casts;
(3) heating process: low speed burns steel, and heat-up rate below 1000 ℃ is 80～120 ℃/h, is heated to 1220～1240 ℃, heat-up time 12～15min/mm;
(4) rolling technology: adopt II type controlled rolling process, the fs is rolling carries out between 930～1050 ℃, and reduction in pass is 10～25%; Accumulative total draft 70～80%; The start rolling temperature of subordinate phase is not higher than 910 ℃, and finishing temperature is 820～860 ℃, accumulative total draft 30～50%;
(5) aligning and ball blast technology: after rolling, the band temperature is carried out hot straightening, carries out Shot Blasting then;
(6) quenching technology: Heating temperature is 920～940 ℃, and be 2.3～2.5min/mm heat-up time, water-cooled, and cooling roller speed is 9m/min;
(7) thermal treatment process: low-temperaturetempering is handled, and tempering temperature is 230～250 ℃, and be 6min/mm heat-up time, air cooling after the tempering;
(8) cutting steel plate, steel plate gets product.
The Brinell hardness number of the high-grade wear-resistant steel plate that the present invention makes is 445HBW～485HBW.
In high-grade wear-resistant steel plate of the present invention, the effect of each chemical ingredients is:
C has remarkably influenced to intensity, low-temperature impact toughness, the welding property of steel; C content is crossed the low NbC growing amount that can make and is reduced; Influence the controlled rolling effect; Also can increase and smelt the control difficulty, the C too high levels can influence the welding property and the atmospheric corrosion resistance ability of steel, and therefore controlling C content is not higher than 0.26%;
As reductive agent and reductor, combinations such as Si and Mo, Cr have the erosion resistance of raising and oxidation resistant effect to Si in steelmaking process, but if surpass, can cause the toughness of steel to descend at 0.5% o'clock, reduce the welding property of steel, and therefore controlling Si content is not higher than 0.50%;
Mn can increase toughness, intensity and the hardness of steel, improves the hardening capacity of steel, improves the hot workability of steel, and cheap, but the Mn too high levels can weaken the resistance to corrosion of steel, reduces welding property, and therefore controlling Mn content is not higher than 1.60%;
Ni can improve the intensity of steel, also strengthens the plasticity and the toughness of steel simultaneously, and Ni content is controlled to be 0.10%～0.30% in steel plate of the present invention;
V is the good reductor of steel, but adds V thinning microstructure crystal grain in the steel, improves intensity and toughness, and the carbide that V and C form also can improve the anti-hydrogen-type corrosion ability of steel under HTHP, and the content of control V is not higher than 0.08%;
The adding of Nb is in order to promote the grain refining of steel rolling microstructure; Simultaneously can improve intensity and toughness, under the Mo existence condition, Nb can be through suppressing austenite recrystallization refinement microstructure effectively in the controlled rolling process; Nb can also reduce the superheated susceptivity and the temper brittleness of steel; In the welding process, the alligatoring that gathers and separate out austenite crystal in the time of can hindering heating partially of Nb, B atom, and guarantee to obtain more tiny heat affected zone tissue after the welding; Improve welding property, control Nb content is not higher than 0.06%;
Ti can form carbon, the nitride particles of tiny Ti; In slab reheat process, can obtain comparatively tiny austenitic microstructure through the alligatoring that stops austenite crystal; The existence of the nitride particles of titanium can suppress the grain coarsening of welded heat affecting zone; Titanium can improve the low-temperature flexibility of matrix metal and welded heat affecting zone simultaneously, has stoped the disadvantageous effect of nomadic nitrogen to the hardening capacity generation of steel, and Ti content is controlled to be and is not higher than 0.03%;
Al is a reductor commonly used in the steel, adds a spot of Al in the steel, but crystal grain thinning; Improve impelling strength; Al also has oxidation-resistance and corrosion resistance, and Al and Cr, Si share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance; But the Al too high levels then can influence hot workability, welding property and the machinability of steel, so the content of Al is controlled to be 0.02%～0.06%;
Cr can significantly improve intensity, hardness and the wear resistance of steel, reduces the plasticity and the toughness of steel simultaneously, and the content of Cr element is not higher than 1.50% in the present invention;
Mo is present in the sosoloid and carbide of steel, and the solution strengthening effect is arranged, and can improve the hardening capacity of steel; In containing the steel of B, Mo is particularly remarkable to the influence of hardening capacity, when Mo and Nb exist simultaneously; Mo can increase the restraining effect to austenite recrystallization in the steel rolling process, and then promotes the refinement of austenitic microstructure, but too much Mo can damage the toughness of the heat affected zone that forms when welding; Reduce the weldability of steel, and the raising of steel cost, so the control of Mo content is not higher than 0.50%;
B can improve the compactness and the hot rolling performance of steel, improves steel plate hardening capacity, improves intensity, and the control of B content is not higher than 0.004%;
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, cold-bending property is degenerated, S reduces the ductility and the toughness of steel; Forging and can cause crackle when rolling; Therefore should reduce P and the content of S in steel, the content of therefore controlling P is not higher than 0.015% as far as possible, and the content of S is not higher than 0.005%.
The chemical composition design of steel plate of the present invention is reasonable, can under the condition of low-carbon (LC), low-carbon-equivalent, guarantee the hardening capacity of steel plate, has obtained more tiny weave construction and the welding property of Geng Jia simultaneously.Adopt II type controlled rolling process in the working method, solved the mill milling insufficient pressure and the thick inequality of crystal grain, the impelling strength that cause reduce problem.
The advantage that the present invention has is: the steel of steel plate of the present invention is pure, P≤0.015%, S≤0.005%; Intensity is high, and ys is more than 1200MPa; The hardness rank is high, and Hardness Distribution is even, and its HB is 445～485HBW; Low-temperature flexibility is good, can guarantee that 20 ℃, 0 ℃ ,-20 ℃ ballistic work is not less than 20J; Weldability ability, processing characteristics, cold-bending property are good, have therefore alleviated the labour intensity that adds man-hour, have practiced thrift man-hour, and have improved the utilization ratio of material; Steel plate thickness is big, and maximum ga(u)ge can reach 80mm, and the steel plate template is good, roughness≤5mm/m; The precious metal that adds in the steel plate is few, and cost is low, and the market competitiveness is strong.Steel plate of the present invention can be widely used in machine industries such as mine, engineering and metallurgical machinery, has a extensive future.
Embodiment
Embodiment 1
High-grade wear-resistant steel plate; The composition quality per-cent of this steel plate is: C:0.22%, Si:0.35%, Mn:1.30%, P:0.010%, S:0.002%, Ni:0.20%, Cr:0.65%, Nb:0.019%, Al:0.045%, Ti:0.017%, Mo:0.30%, V:0.042%, B:0.0015%, all the other are Fe and inevitable impurity.
The working method of high-grade wear-resistant steel plate comprises the steps:
(1) smelting technology: the molten steel that will contain above-mentioned each composition quality per-cent is sent into the refining of LF refining furnace behind electrosmelting; Feed 450 meters on Al line, after refining finishes, the vacuum-treat of bull ladle VD stove; Add the SiCa piece before the vacuum; The consumption of SiCa is a 1kg/ ton steel, and vacuum tightness 0.4 torr destroys vacuum when vacuum keeps 25 minutes;
(2) casting process: temperature remains 1530～1540 ℃ after the vacuum breaking, casts;
(3) heating process: low speed burns steel, and heat-up rate below 1000 ℃ is 80 ℃/h, is heated to 1220 ℃, total heat-up time 15min/mm;
(4) rolling technology: adopt II type controlled rolling process, the fs is rolling carries out between 960～1050 ℃, and reduction in pass is 25%; Accumulative total draft 73% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite; Start rolling temperature is 910 ℃, and finishing temperature is 840 ℃, accumulative total draft 36%;
(5) aligning and ball blast technology: after rolling, the band temperature is carried out hot straightening, carries out Shot Blasting then, guarantees that surface of steel plate is good;
(6) quenching technology: Heating temperature is 930 ℃, and be 2.3min/mm heat-up time, water-cooled, and water yield 3800t/h, cooling roller speed is 9m/min;
(7) thermal treatment process: low-temperaturetempering is handled, and tempering temperature is 230 ℃, and be 6min/mm heat-up time, air cooling after the tempering;
(8) cutting steel plate, steel plate gets product.
The mechanical property of present embodiment finished product steel plate: ys: 1320MPa; Tensile strength: 1560MPa; Steel plate cross section HB: 465～480HBW; 20 ℃ of transverse impact: 73J, 82J, 63J;-20 ℃ of transverse impact: 37J, 42J, 61J; 180 ° of clod wash d=4a are good.
Embodiment 2
High-grade wear-resistant steel plate; The composition quality per-cent of this steel plate is: C:0.23%, Si:0.40%, Mn:1.25%, P:0.010%, S:0.002%, Ni:0.18%, Cr:0.70%, Nb:0.020%, Al:0.037%, Ti:0.020%, Mo:0.27%, V:0.050%, B:0.0027%, all the other are Fe and inevitable impurity.
The working method of high-grade wear-resistant steel plate comprises the steps:
(1) smelting technology: the molten steel that will contain above-mentioned each composition quality per-cent is sent into the refining of LF refining furnace behind electrosmelting; Feed 500 meters on Al line, after refining finishes, the vacuum-treat of bull ladle VD stove; Add the SiCa piece before the vacuum; The consumption of SiCa is a 0.5kg/ ton steel, and vacuum tightness 0.5 torr destroys vacuum when vacuum keeps 15 minutes;
(2) casting process: temperature remains 1530～1540 ℃ after the vacuum breaking, casts;
(3) heating process: low speed burns steel, and heat-up rate below 1000 ℃ is controlled to be 120 ℃/h, is heated to 1240 ℃, total heat-up time 12min/mm;
(4) rolling technology: adopt II type controlled rolling process, the fs is rolling carries out between 930～1050 ℃, and reduction in pass is 10%; Accumulative total draft 70%; Make austenite generation perfect recrystallization, with refine austenite crystal grain, the subordinate phase start rolling temperature is 900 ℃; Finishing temperature is 820 ℃, accumulative total draft 30%;
(5) aligning and ball blast technology: after rolling, the band temperature is carried out hot straightening, carries out Shot Blasting then, guarantees that surface of steel plate is good;
(6) quenching technology: Heating temperature is 920 ℃, and be 2.5min/mm heat-up time, water-cooled, and water yield 3900t/h, cooling roller speed is 9m/min;
(7) thermal treatment process: low-temperaturetempering is handled, and tempering temperature is 250 ℃, and be 6min/mm heat-up time, air cooling after the tempering;
(8) cutting steel plate, steel plate gets product.
The mechanical property of present embodiment finished product steel plate: ys: 1280MPa; Tensile strength: 1510MPa; Steel plate cross section HB: 445～460HBW; 20 ℃ of transverse impact: 66J, 77J, 69J;-20 ℃ of transverse impact: 34J, 29J, 31J; 180 ° of clod wash d=4a are good.
Embodiment 3
High-grade wear-resistant steel plate; The composition quality per-cent of this steel plate is: C:0.19%, Si:0.30%, Mn:1.20%, P:0.009%, S:0.003%, Ni:0.26%, Cr:0.60%, Nb:0.026%, Al:0.020%, Ti:0.024%, Mo:0.23%, V:0.040%, B:0.0020%, all the other are Fe and inevitable impurity.
The working method of high-grade wear-resistant steel plate comprises the steps:
(1) smelting technology: the molten steel that will contain above-mentioned each composition quality per-cent is sent into the refining of LF refining furnace behind electrosmelting; Feed 400 meters on Al line, after refining finishes, the vacuum-treat of bull ladle VD stove; Add the SiCa piece before the vacuum; The consumption of SiCa is a 1.0kg/ ton steel, and vacuum tightness 0.3 torr destroys vacuum when vacuum keeps 15 minutes;
(2) casting process: temperature remains 1530～1540 ℃ after the vacuum breaking, casts;
(3) heating process: low speed burns steel, and heat-up rate below 1000 ℃ is controlled to be 100 ℃/h, is heated to 1240 ℃, total heat-up time 12min/mm
(4) rolling technology: adopt II type controlled rolling process, the fs is rolling carries out between 930～1050 ℃, and reduction in pass is 20%; Accumulative total draft 80%; Make austenite generation perfect recrystallization, with refine austenite crystal grain, the subordinate phase start rolling temperature is 900 ℃; Finishing temperature is 860 ℃, accumulative total draft 50%;
(5) aligning and ball blast technology: after rolling, the band temperature is carried out hot straightening, carries out Shot Blasting then, guarantees that surface of steel plate is good;
(6) quenching technology: Heating temperature is 940 ℃, and be 2.5min/mm heat-up time, water-cooled, and water yield 3900t/h, cooling roller speed is 9m/min;
(7) thermal treatment process: low-temperaturetempering is handled, and tempering temperature is 230 ℃, and be 6min/mm heat-up time, air cooling after the tempering;
(8) cutting steel plate, steel plate gets product.
The mechanical property of present embodiment finished product steel plate: ys: 1310MPa; Tensile strength: 1530MPa; Steel plate cross section HB: 455～485HBW; 20 ℃ of transverse impact: 62J, 71J, 64J;-20 ℃ of transverse impact: 36J, 40J, 53J; 180 ° of clod wash d=4a are good.
Claims (2)
1. high-grade wear-resistant steel plate; It is characterized in that; The composition quality per-cent of steel plate is: C:0.19%～0.23%, Si:0.30%～0.40%, Mn:1.20%～1.30%, P: S≤0.015% :≤0.005%, Ni:0.18%～0.26%, V:0.04%～0.05%, Nb:0.019%～0.026%, Al:0.020%～0.045%, Cr:0.60%～0.70%, Mo:0.23%～0.30%, Ti:0.017%～0.024%, B:0.0015%～0.0027%, and all the other are Fe and inevitable impurity; Said steel plate makes through the working method that may further comprise the steps:
(1) smelting technology: will contain mass percent is: C:0.19%～0.23%, Si:0.30%～0.40%, Mn:1.20%～1.30%, P: S≤0.015% :≤0.005%, the molten steel of Ni:0.18%～0.26%, V:0.04%～0.05%, Nb:0.019%～0.026%, Al:0.020%～0.045%, Cr:0.60%～0.70%, Mo:0.23%～0.30%, Ti:0.017%～0.024%, B:0.0015%～0.0027% composition is sent into the refining of LF refining furnace behind electrosmelting; After refining finishes; The vacuum-treat of bull ladle VD stove; Vacuum tightness 0～0.5 torr destroys vacuum when vacuum keeps 15～25 minutes;
(2) casting process: temperature remains 1530～1540 ℃ after the vacuum breaking, casts;
(3) heating process: low speed burns steel, and heat-up rate below 1000 ℃ is 80～120 ℃/h, is heated to 1220～1240 ℃, heat-up time 12～15min/mm;
(4) rolling technology: adopt II type controlled rolling process, the fs is rolling carries out between 930～1050 ℃, and reduction in pass is 10～25%; Accumulative total draft 70～80%; The start rolling temperature of subordinate phase is not higher than 910 ℃, and finishing temperature is 820～860 ℃, accumulative total draft 30～50%;
(5) aligning and ball blast technology: after rolling, the band temperature is carried out hot straightening, carries out Shot Blasting then;
(6) quenching technology: Heating temperature is 920～940 ℃, and be 2.3～2.5min/mm heat-up time, water-cooled, and cooling roller speed is 9m/min;
(7) thermal treatment process: low-temperaturetempering is handled, and tempering temperature is 230～250 ℃, and be 6min/mm heat-up time, air cooling after the tempering;
(8) cutting steel plate, steel plate gets product.
2. high-grade wear-resistant steel plate according to claim 1 is characterized in that, the Brinell hardness number of steel plate is 445HBW～485HBW.
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| CN101451220A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | High-strength abrasion-proof steel plate and method for producing the same |
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| CN101451220A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | High-strength abrasion-proof steel plate and method for producing the same |
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