CN101451220A - High-strength abrasion-proof steel plate and method for producing the same - Google Patents
High-strength abrasion-proof steel plate and method for producing the same Download PDFInfo
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Abstract
The invention relates to a high strength wear resistant steel plate, which comprises the following chemical components by weight percentage: 0.12 to 0.16 percent of C, 0.10 to 0.70 percent of Si, 0.90 to 1.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.05 to 0.30 percent of Ni, 0.03 to 0.08 percent of V, 0.01 to 0.06 percent of Nb, 0.020 to 0.08 percent of Al, 0.20 to 0.70 percent of Cr, 0. 1 to 0.50 percent of Mo, 0.010 to 0.060 percent of Ti, 0.0005 to 0.0030 percent of B, and the balance being Fe and inevitable impurities. The steel plate manufactured through reasonable design of alloy components and main control of quenching and temper processes has the thickness of 60mm, ball hardness number between 360 and 440, even hardness distribution, tensile strength not less than 1,220MPa, good welding performance, good cold bending performance, good impact toughness, excellent steel plate shape, and wide application prospect, and can be widely applied to engineering machinery manufacturing.
Description
(1) technical field
The present invention relates to a kind of engineering machinery high-strength abrasion-proof steel plate and preparation method thereof.
(2) background technology
Along with the development of the development of the national economy, market increases day by day to the demand of high-strength wearable steel.Industries such as coal mine machinery, engineering machinery, water power, bridge particularly.Existing high-strength wearable steel mostly is quenched and tempered steel, is mainly used in to make parts such as mine car base plate, power shovel more than 100 tons.But present wear resisting steel generally can only satisfy the requirement on the hardness, and the matched performance of intensity and toughness aspect is then relatively poor, occurs problems such as brittle failure easily in use, and it is also restricted to process thickness in addition, and the development of high-strength wearable Plate Steel exists bottleneck.
(3) summary of the invention
The object of the present invention is to provide a kind of high-strength abrasion-proof steel plate, Hardness Distribution is even, and has good tough matching, and good welding property, and the work range of steel plate thickness is 8～60mm.
The technical solution used in the present invention is as follows:
A kind of high-strength abrasion-proof steel plate, it is as follows that the chemical ingredients of steel plate is formed (by weight percentage):
C 0.12～0.16%, and Si 0.10～0.70%, and Mn 0.90～1.50%, P≤0.020%, S≤0.010%, Ni 0.05～0.30%, V 0.03～0.08%, Nb 0.01～0.06%, and Al 0.02～0.08%, and Cr 0.20～0.70%, Mo 0.1～0.50%, Ti 0.010～0.060%, and B 0.0005～0.0030%, and all the other are Fe and unavoidable impurities.
Preferably, each chemical ingredients of described high-strength abrasion-proof steel plate is composed as follows:
C 0.14～0.16%, and Si 0.20～0.50%, and Mn 1.20～1.30%, P≤0.015%, S≤0.005%, Ni 0.15～0.25%, V 0.045～0.055%, Nb 0.02～0.03%, and Al 0.020～0.04%, Cr0.20～0.30%, Mo 0.25～0.35%, Ti 0.010～0.020%, and B 0.0020～0.0030%, and all the other are Fe and unavoidable impurities.
Described high-strength abrasion-proof steel plate, the steel plate Brinell hardness number is 360～440, tensile strength is not less than 1220MPa.
The chemical composition design that steel plate of the present invention adopts, carbon equivalent is low, good welding performance; The noble metal content that adds is few, and cost is low; Design of alloy is reasonable, can guarantee steel plate hardening capacity under the condition of low-carbon (LC), low-carbon-equivalent; Steel plate integral body has good wear resistance, tough matching and welding property.
Wherein, the effect in the present invention of each chemical ingredients and content is:
C 0.14～0.16%: carbon produces remarkably influenced to intensity, low-temperature impact toughness, the welding property of steel.Carbon content is crossed the low NbC growing amount that can make and is reduced, and influences the controlled rolling effect, also can increase and smelt the control difficulty; Carbon content is too high, then can influence the welding property and the atmospheric corrosion resistance ability of steel.
Si 0.20～0.50%: as reductive agent and reductor, combinations such as silicon and molybdenum, chromium have the erosion resistance of raising and oxidation resistant effect, surpass at 0.5% o'clock in steelmaking process, can cause the toughness of steel to descend, and reduce the welding property of steel.
Mn 1.20～1.30%: manganese is with low cost, can increase toughness, intensity and the hardness of steel, improves the hardening capacity of steel, improves the hot workability of steel; The manganese amount is too high, can weaken the resistance to corrosion of steel, reduces welding property.
P≤0.015%, S≤0.005%: in the ordinary course of things, p and s all is a harmful element in the steel, increases the fragility of steel.Phosphorus degenerates welding property, reduces plasticity, and cold-bending property is degenerated; Sulphur reduces the ductility and the toughness of steel, is forging and causing when rolling crackle; Therefore should reduce the content of p and s in steel as far as possible.
Ni 0.15～0.25%: nickel can improve the intensity of steel, also strengthens the plasticity and the toughness of steel simultaneously, therefore for wear resisting steel, should get reasonable trim point between intensity and hardness.
V 0.045～0.055%: vanadium is the good reductor of steel.But add vanadium thinning microstructure crystal grain in the steel, improve intensity and toughness.The carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.
Nb 0.02～0.03%: the adding of niobium is in order to promote the grain refining of steel rolling microstructure, can to improve intensity and toughness simultaneously, under the molybdenum existence condition, niobium can be in the controlled rolling process effective refinement microstructure, and improve hardening capacity by precipitation strength.Niobium can 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 niobium, boron atom, and guarantee to obtain more tiny heat affected zone tissue after the welding, improve welding property.
Ti 0.010～0.020%: can form carbon, the oxynitride particle of tiny titanium, can obtain comparatively tiny austenitic microstructure by the alligatoring that stops austenite crystal in slab reheat process.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.
Al 0.020～0.040%: aluminium is reductor commonly used in the steel.Add a spot of aluminium in the steel, but crystal grain thinning improves impelling strength.Aluminium also has oxidation-resistance and corrosion resistance, and aluminium and chromium, silicon share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance, too high hot workability, welding property and the machinability that then influences steel.
Cr 0.20～0.30%: chromium can significantly improve intensity, hardness and the wear resistance of steel, reduces plasticity and toughness simultaneously.
Mo 0.25～0.35%: molybdenum 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 boron-containing steel, molybdenum is particularly remarkable to the influence of hardening capacity.When molybdenum and niobium add fashionablely simultaneously, molybdenum can promote the refinement of austenitic microstructure in the controlled rolling process.But the toughness of the heat affected zone that forms when too much molybdenum can damage welding, the weldability and the cost height of reduction steel.
B 0.0020～0.0030%: the boron that adds trace in the steel can improve the compactness and the hot rolling performance of steel, improves steel plate hardening capacity, improves intensity.
The present invention also provides a kind of preparation method with high-strength abrasion-proof steel plate of above-mentioned chemical ingredients composition and Brinell hardness number, may further comprise the steps:
1) molten steel that will contain the proportioning chemical ingredients carries out electrosmelting, the refining of LF stove, VD vacuum-treat, the feeding aluminum steel is 500～600 meters during refining, add the SiCa reductor according to 0.5-1kg/ ton steel before the vacuum, the VD vacuum-treat is not more than in vacuum tightness under the condition of 0.5 torr and keeps 15min at least;
2) molten steel after the step 1) vacuum-treat is cast at 1565～1580 ℃;
3) at 1220～1240 ℃ of heating 8-9min/mm;
4) be rolled at 950～1100 ℃, reduction in pass is 10～30%, and the accumulative total draft is not less than 70%; Rolling once more, start rolling temperature is not higher than 930 ℃, and finishing temperature is not higher than 840 ℃, and the accumulative total draft is not less than 30%;
5) carry out quench treatment, water-cooled behind 890～920 ℃ of heating 2.0-2.5min/mm, quench roller speed is 2～16m;
6) 150～250 ℃ of temper, be 3～5min/mm heat-up time, air cooling.
Preferably, in said process, carry out carrying out Shot Blasting to guarantee that surface of steel plate is good before the quench treatment.
The operation of described step 1) can reduce nonmetallic inclusionsin steel, harmful element content to greatest extent, guarantees the purity of molten steel, specifically can carry out in 90 tons of UHP electric furnaces.
Step 2) in, according to the different size of steel plate, select the continuous caster casting, what the present invention adopted is the continuous caster of 250 X 1800mm;
Be to adopt II type controlled rolling process in the step 4), rolling purpose of fs is to make austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, adopts II type cooling controlling and rolling controlling process, has solved the mill milling insufficient pressure and the thick inequality of crystal grain, the impelling strength that cause lower phenomenon;
In the step 5), quenching is a kind of complicated heat treatment technology, is one of critical process of decision quality product, produces serious deformation and cracking when obtaining tiny martensitic stucture after preventing to quench, should reasonably determine quenching heating and cooling method in conjunction with C curve according to the composition of steel;
During quenching, add the preferred 2.3min/mm of time of thermal control, the selection of cooling water amount and roller speed can be carried out with reference to table 1.
The back steel plate that quenches is a full thickness martensite, studies show that the armor plate strength rank height of full thickness martensitic stucture than mixed structure.
Table 1
| Specification mm | Water yield t/h | Roller speed m |
| 8-16 | 5200 | 16 |
| 20-25 | 5200 | 10-14 |
| 25-35 | 6400 | 8-10 |
| 40-60 | 8000 | 2 |
In the step 6), the tempered purpose is to reduce the fragility of hardened steel, reduces or eliminates internal stress, tissue is tended towards stability and obtains needed performance, and heat-up time, preferred 4min/mm organized based on tempered martensite after the tempering.
The present invention has following advantage with respect to prior art:
Present method adds it mainly is the control of quenching and tempering process by the appropriate design to alloying constituent, and the steel plate thickness that makes can reach 60mm (and existing 30mm can't accomplish), and Brinell hardness number is 360～440, and Hardness Distribution is even; The tensile strength height is not less than 1220Mpa; Carbon equivalent is low, between 0.45～0.55%, and good welding performance; Cold-bending property is good, and the resilience of not ftractureing during the material making has alleviated labour intensity, saves man-hour and the utilization ratio that has improved material; Impelling strength is good, and-40 ℃ of transverse impacts are greater than 17J; The steel plate template is good, and roughness≤3mm/m has excellent comprehensive performances.High-strength abrasion-proof steel plate of the present invention can be widely used in the engineering machinery manufacturing, has a extensive future.
(4) embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1
High-strength abrasion-proof steel plate, thickness 50mm, its chemical ingredients consists of: C 0.16%, Si 0.40%, and Mn 1.25%, and P 0.010%, S 0.003%, and Ni 0.20%, and V 0.054%, Nb 0.021%, and Al 0.036%, and Cr 0.22%, Mo 0.27%, Ti 0.015%, and B 0.0024%, and surplus is iron and unavoidable impurities.Its mechanical property: yield strength 1120MPa, tensile strength: 1350Mpa; Steel plate cross section Brinell hardness: 410～415;-40 ℃ of transverse impacts: 29J 35J 36J; Clod wash d=3a is good.
Prepare according to following step:
(1) smelting technology: the molten steel that will contain above-mentioned each weight percentage Chemical Composition is smelted in 90 tons of UHP electric furnaces earlier, sends into the refining of LF refining furnace then, feeds 550 meters on Al line, and refining process guarantees that refining slag is white, to guarantee deoxidation effect; The vacuum-treat of bull ladle VD stove added SiCa piece 90kg after refining finished before the vacuum, and vacuum tightness is not more than 0.5 torr, keeps 15 minutes;
(2) casting: after the vacuum breaking, 1570 ℃ are adopted the casting of 250 X 1800mm continuous casters;
(3) heating: at 1220 ℃ of heating 9min/mm;
(4) rolling: adopt II type controlled rolling process, the fs is rolling carries out between 950～1000 ℃, and this stage reduction in pass is 25%, and the accumulative total draft is 75%; The subordinate phase start rolling temperature is 930 ℃, and finishing temperature is 820 ℃, and the accumulative total draft is 34%;
(5) ball blast: the steel plate after rolling carries out Shot Blasting and guarantees that surface of steel plate is good;
(6) quench: to steel plate quenching, Heating temperature is 920 ℃ to steel plate before modified line behind the ball blast, heating 2.3min/mm, and with water yield 8000t/h cooling, quench roller speed is 2m, obtains the full thickness martensite steel plate after the quenching;
(7) tempering: the back steel plate that quenches is 180 ℃ of tempering, and be 4min/mm total heat-up time, steel plate air cooling after the tempering.
Embodiment 2
High-strength abrasion-proof steel plate, thickness 25mm, its chemical ingredients consists of: C 0.15%, Si 0.50%, and Mn 1.20%, and P 0.008%, S 0.004%, and Ni 0.23%, and V 0.050%, Nb 0.022%, and Al 0.030%, and Cr 0.25%, Mo 0.28%, Ti 0.018%, and B 0.0025%, and surplus is iron and unavoidable impurities.Its mechanical property: yield strength 1110MPa, tensile strength: 1330Mpa; Steel plate cross section Brinell hardness: 405～410;-40 ℃ of transverse impacts: 37J 38J 30J; Clod wash d=3a is good.
Prepare according to following step:
(1) smelting technology: the molten steel that will contain above-mentioned each weight percentage Chemical Composition is smelted in 90 tons of UHP electric furnaces earlier, sends into the refining of LF refining furnace then, feeds 520 meters on Al line, and refining process guarantees that refining slag is white, to guarantee deoxidation effect; The vacuum-treat of bull ladle VD stove added SiCa piece 90kg after refining finished before the vacuum, and vacuum tightness is not more than 0.5 torr, keeps 15 minutes;
(2) casting: after the vacuum breaking, 1575 ℃ are adopted the casting of 250 X1800mm continuous casters;
(3) heating: at 1240 ℃ of heating 8min/mm;
(4) rolling: adopt II type controlled rolling process, the fs is rolling carries out between 950～1000 ℃, and this stage reduction in pass is 27%, and the accumulative total draft is 70%; The subordinate phase start rolling temperature is 930 ℃, and finishing temperature is 820 ℃, and the accumulative total draft is 35%;
(5) ball blast: the steel plate after rolling carries out Shot Blasting and guarantees that surface of steel plate is good;
(6) quench: to steel plate quenching, Heating temperature is 920 ℃ to steel plate before modified line behind the ball blast, heating 2.3min/mm, and with water yield 5200t/h cooling, quench roller speed is 10m, obtains the full thickness martensite steel plate after the quenching;
(7) tempering: the back steel plate that quenches is 200 ℃ of tempering, and be 4min/mm total heat-up time, steel plate air cooling after the tempering.
Embodiment 3
High-strength abrasion-proof steel plate, thickness 16mm, its chemical ingredients consists of: C 0.14%, Si 0.45%, and Mn 1.20%, and P 0.012%, S 0.003%, and Ni 0.16%, and V 0.049%, Nb 0.020%, and Al 0.025%, and Cr 0.20%, Mo 0.26%, Ti 0.020%, and B 0.0028%, and surplus is iron and unavoidable impurities.Its mechanical property: yield strength 1080MPa, tensile strength: 1300Mpa; Steel plate cross section Brinell hardness: 398～405;-40 ℃ of transverse impacts: 40J 32J 37J; Clod wash d=3a is good.
Prepare according to following step:
(1) smelting technology: the molten steel that will contain above-mentioned each weight percentage Chemical Composition is smelted in 90 tons of UHP electric furnaces earlier, sends into the refining of LF refining furnace then, feeds 500 meters on Al line, and refining process guarantees that refining slag is white, to guarantee deoxidation effect; The vacuum-treat of bull ladle VD stove added SiCa piece 75kg after refining finished before the vacuum, and vacuum tightness is not more than 0.5 torr, keeps 15 minutes;
(2) casting: after the vacuum breaking, 1578 ℃ are adopted the casting of 250 X 1800mm continuous casters;
(3) heating: at 1240 ℃ of heating 8min/mm;
(4) rolling: adopt II type controlled rolling process, the fs is rolling carries out between 950～1000 ℃, and this stage reduction in pass is 30%, and the accumulative total draft is 75%; The subordinate phase start rolling temperature is 930 ℃, and finishing temperature is 820 ℃, and the accumulative total draft is 30%;
(5) ball blast: the steel plate after rolling carries out Shot Blasting and guarantees that surface of steel plate is good;
(6) quench: to steel plate quenching, Heating temperature is 920 ℃ to steel plate before modified line behind the ball blast, heating 2.3min/mm, and with maximum amount of water 5200t/h cooling, quench roller speed is 16m.Obtain the full thickness martensite steel plate after the quenching;
(7) tempering: the back steel plate that quenches is 160 ℃ of tempering, and be 4min/mm total heat-up time, steel plate air cooling after the tempering.
Claims (5)
1. high-strength abrasion-proof steel plate, it is characterized in that described steel plate chemical ingredients by weight percentage is composed as follows: C 0.12～0.16%, Si 0.10～0.70%, Mn 0.90～1.50%, P≤0.020%, S≤0.010%, Ni 0.05～0.30%, and V 0.03～0.08%, and Nb 0.01～0.06%, Al 0.020～0.08%, Cr 0.20～0.70%, and Mo 0.1～0.50%, and Ti 0.010～0.060%, B 0.0005～0.0030%, and all the other are Fe and unavoidable impurities.
2. high-strength abrasion-proof steel plate as claimed in claim 1, it is characterized in that each chemical ingredients is composed as follows: C 0.14～0.16%, and Si 0.20～0.50%, Mn 1.20～1.30%, P≤0.015%, S≤0.005%, Ni 0.15～0.25%, and V 0.045～0.055%, and Nb 0.02～0.03%, Al 0.020～0.04%, Cr0.20～0.30%, Mo 0.25～0.35%, and Ti 0.010～0.020%, B 0.0020～0.0030%, and all the other are Fe and unavoidable impurities.
3. high-strength abrasion-proof steel plate as claimed in claim 1 or 2 is characterized in that described steel plate Brinell hardness number is 360～440, and tensile strength is not less than 1220MPa.
4. the preparation method of high-strength abrasion-proof steel plate as claimed in claim 3 is characterized in that described preparation method may further comprise the steps:
1) molten steel that will contain the proportioning chemical ingredients carries out electrosmelting, the refining of LF stove, VD vacuum-treat, the feeding aluminum steel is 500～600 meters during refining, add the SiCa reductor according to 0.5-1kg/ ton steel before the vacuum, the VD vacuum-treat is not more than in vacuum tightness under the condition of 0.5 torr and keeps 15min at least;
2) molten steel after the step 1) vacuum-treat is cast at 1565～1580 ℃;
3) at 1220～1240 ℃ of heating 8-9min/mm;
4) be rolled at 950～1100 ℃, reduction in pass is 10～30%, and the accumulative total draft is not less than 70%; Rolling once more, start rolling temperature is not higher than 930 ℃, and finishing temperature is not higher than 840 ℃, and the accumulative total draft is not less than 30%;
5) carry out quench treatment, water-cooled behind 890～920 ℃ of heating 2.0-2.5min/mm, quench roller speed is 2～16m;
6) 150～250 ℃ of temper, be 3～5min/mm heat-up time, air cooling.
5. the preparation method of high-strength abrasion-proof steel plate as claimed in claim 4 is characterized in that carrying out carrying out Shot Blasting before the quench treatment.
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