CN101792883A - Method for producing 8CrV2 hot-rolled sheet steel - Google Patents
Method for producing 8CrV2 hot-rolled sheet steel Download PDFInfo
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Abstract
The invention provides a method for preparing high-quality 8CrV2 hot-rolled sheet steel based on continuous casting and continuous rolling processes of sheet billets. The method mainly comprises the technical processes of smelting, refining, continuous casting of sheet billets, soaking, hot continuous rolling, cooling and coiling. The superheat degree T(superheat) of molten steel is greater than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T(charging) of casting billets is greater than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finishing temperature T(finishing) is greater than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T(coiling) is greater than or equal to 550 DEG C and less than or equal to 630 DEG C, and the pulling speed S(pulling) of continuous casting is greater than or equal to 3.5m/min and less than or equal to 5.5m/min; covering slag is used for casting; and the molten steel comprises the following chemical components: 0.70-0.80 of C, 0.20-0.45 of Si, 0.60-0.90 of Mn, less than or equal to 0.025 of P, less than or equal to 0.025 of S, 0.30-0.60 of Cr and 0.02-0.08 of V. The 8CrV2 hot-rolled sheet steel prepared by the method of the invention reduces the segregation, loosen and cracks of the casting billets, and has the characteristics of uniform structure property and high fatigue resistance.
Description
Technical field
The invention belongs to the alloy tool steel production technical field, be specially adapted to adopt bar strip continuous casting and rolling flow path to produce the method for 8CrV2 hot-rolled steel sheet.
Technical background
The 8CrV2 alloy tool steel has high hardness, toughness, wear resistance, and hardening capacity good, be difficult for advantages such as decarburization, surface quality be good, this alloy tool steel is saw blade, extraordinary instrument and the indispensable product of spring.With silicomanganese is that structural alloy steel is compared, 8CrV2 adds V simultaneously and makes grain refining because the adding of Cr makes that the hardening capacity of steel is better, guarantee at high temperature still to have the higher elastic limit and the tension limit, and have the decarburization of being difficult for, surface quality is good and the fatigue performance advantages of higher.
The 8CrV2 hot-rolled steel sheet is produced, and has following subject matter: owing to 8CrV2 carbon content height, alloying constituent complexity, p and s causes strand component segregation and loose easily, causes the inhomogeneous of the finished product structure property; In addition, the liquidus temperature of 8CrV2 is low, causes the strand temperature low, if the cooling of secondary cooling zone is too fast, the strand temperature enters the cold plasticity district, cracks in the surface and the limit portion of strand, directly influences quality product.
CSP is a new technology of preparing of producing latten, it with traditional continuous casting, heating, hot continuous rolling etc. independently operation organically integrate, have with short production cycle, advantages such as energy consumption is low, reduced investment.In recent ten years, this technology in the world particularly China applied rapidly, existing at present 13 production lines come into operation, total throughput reaches 3,500 ten thousand tons/year.CSP has become a kind of important technological process of production of latten, and product mainly is based on all kinds of steel grades of low-carbon (LC), and medium and high carbon steel, particularly field of alloy steel rarely have and relate to.Hunan Hualing Lianyuan Iron And Steel Co., Ltd has carried out the related work of medium and high carbon steel based on sheet billet continuous casting and rolling production line, 200810048357.1) and " a kind of based on sheet bar process contain Nb medium high carbon high-strength steel and manufacture method thereof " (application number: two patents 200810048358.6) " a kind of production method of the medium high carbon high-strength steel based on sheet bar process " (application number: has been proposed, but described application has just been done a wide in range summary to the method for producing the medium high carbon high-strength steel based on bar strip continuous casting and rolling flow path, its described parameter area, it is the parameter area of the most basic selection of all bar strip continuous casting and rolling flow path, all steel grades all be according to this most widely scope formulate concrete production technique, and at different steel grades, every kind of concrete production technique all needs those skilled in the art just can draw through a large amount of experiment and performing creative labours.Technology and the method for above-mentioned patent except mentioning that not alloy tool steel is concrete, the while is not mentioned the concrete solution of the key technical problem that the alloy tool steel production process exists yet, and does not particularly mention technology of preparing and the method for 8CrV2.
Summary of the invention
The purpose of this invention is to provide a kind of method of producing the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path.The 8CrV2 hot-rolled steel sheet that adopts the method for the invention to produce has the advantages that structure property is even, fatigue performance is high, has significantly improved the quality of 8CrV2 hot-rolled steel sheet.
The present invention is achieved by the following technical programs:
A kind of method of producing the 8CrV2 hot-rolled steel sheet adopts bar strip continuous casting and rolling flow path, and mainly comprise electric furnace or converter smelting, refining, sheet blank continuous casting, strand soaking, hot continuous rolling, laminar flow cooling, batch step,
Wherein, the chemical ingredients that refining process carries out the molten steel after the Alloying Treatment is: C 0.75～0.85wt%, Si 0.20～0.40wt%, Mn 0.30～0.60wt%, P≤0.025wt%, S≤0.025wt%, Cr 0.40～0.70wt%, V 0.15～0.25wt%, all the other are Fe and unavoidable impurities;
The processing parameter of described bar strip continuous casting and rolling flow path is: continuous casting pulling rate S
DrawBe 3.5m/min≤S
Draw≤ 5.5m/min, strand charging temperature T
Go intoBe 900 ℃≤T
Go into≤ 1050 ℃, finishing temperature T
EventuallyBe 850 ℃≤T
Eventually≤ 950 ℃, coiling temperature T
VolumeBe 550 ℃≤T
Volume≤ 650 ℃, molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃, secondary cooling zone is weak cold;
The cast of employing covering slag, the physical and chemical index of described covering slag: fluxing point is 997 ± 20 ℃, and basicity is 0.92 ± 0.1, and viscosity is 1290 ± 2 ℃, 0.95 ± 0.3 pool, volume density is 0.60 ± 0.1Kg/L.
The fatigue and cyclic cycle reaches more than 1,000,000 times, and monolateral decarburized layer deepness is 0.3～1.2% of a steel plate thickness.
Preferably, the chemical ingredients of described molten steel is: C 0.75～0.85wt%, Si 0.20～0.35wt%, Mn 0.30～0.50wt%, P≤0.010wt%, S≤0.004wt%, Cr 0.40～0.60wt%, V 0.15～0.20wt%, all the other are Fe and unavoidable impurities; The fatigue and cyclic cycle reaches more than 1,500,000 times.
Preferably, described processing parameter also comprises: strand liquid core is depressed L
PressBe 2mm≤L
Press≤ 20mm.
Preferably, described strand charging temperature is T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃, monolateral decarburized layer deepness is 0.3～0.9% of a steel plate thickness; More preferably, described strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃, monolateral decarburized layer deepness is 0.3～0.6% of a steel plate thickness; Described coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
The present invention has improved the quality of 8CrV2 hot-rolled steel sheet by optimizing and revising the concrete processing parameter that the 8CrV2 hot-rolled steel sheet is produced, and particularly, characteristics of the present invention are:
1. adopt low p and s control techniques, guarantee the fatigue property of product.Alloy tool steel 8CrV2 is mainly used in high-end high-grade alloy tool manufacturing, and the major reason that causes quality product is fatigure failure, has a strong impact on its use properties and scope.Show after deliberation, produce tired major cause and be the segregation that sulfide inclusion and phosphorus cause in the steel, so the control of p and s is the key of alloy tool steel 8CrV2 quality control in the steel.In order to ensure the fatigue property of product, adopted low p and s control techniques.
2. break through traditional technological limit, continuous casting adopts high molten steel overheat and the weak cold technology of secondary cooling zone.For guaranteeing slab quality, adopt low overheat cast (superheating temperature is 15～30 ℃) usually.But (liquidus temperature is about 1461 ℃ because the 8CrV2 liquidus temperature is low, liquidus temperature than soft steel commonly used hangs down about 70 ℃), as adopt existing low overheat placing and the strong cold system of secondary cooling zone, to cause the strand temperature low, bending section at continuous casting, strand enters the cold plasticity district, causes casting billet surface and limit portion crackle, has a strong impact on the quality of the finished product.For this reason, break through traditional technological limit, adopt the cast of high molten steel overheat, superheating temperature is brought up to 30～45 ℃ from 15～30 ℃, secondary cooling zone is taked weak cold technology, has significantly improved slab quality;
3. adopt the liquid core to depress technology, improve the homogeneity of continuous casting billet structure, thereby improve the structure property homogeneity of the finished product.In the casting blank solidification process, adopt the liquid core to depress technology, significantly reduced the defective of segregation, loose and internal fissure, improved slab quality, lay a good foundation for obtaining high-quality final hot-rolled steel sheet;
4. adopt special-purpose covering slag.Sheet blank continuous casting pulling rate height, speed of cooling are fast; steel alloy carbon content height, alloying constituent complexity; for guaranteeing that casting process carries out smoothly; guarantee slab quality simultaneously; developed the covering slag of the special use that is applicable to bar strip continuous casting and rolling flow path production steel alloy; break through the mentality of designing of traditional process continuous casting covering slag, had the advantage of eutectic melting point, low basicity, moderate viscosity and low volume density.Cast curve when adopting common covering slag to pour into a mould, wide hot-fluid of casting process crystallizer progressively descends, and the leptoprosopy hot-fluid rises, and along with connecting the increase of watering the stove number, the probability that bonding steel leakage takes place surpasses 30%.Use continuous casting covering slag of the present invention; in the liquid steel temperature frequent fluctuation and after constantly absorbing inclusion; crystallizer hot-fluid all-the-time stable; can not occur the broadside hot-fluid along with the carrying out of sequence casting descends; the phenomenon that narrow limit hot-fluid rises, continuous casting covering slag of the present invention is suitable for the high pulling rate of sheet blank continuous casting and can keeps stable high crystallizer heat flow density.
5. design specific coiling temperature and strict control.Studies show that the 8CrV2 hot-rolled steel sheet discharges a large amount of latent heats of phase change in coiling process, will cause the volume that collapses if coiling temperature control is improper, coil of strip can't be delivered goods, and needs coiling temperature is set in specific scope and strict control for this reason.
6. quality product height.Difference of hardness HRC and surface of steel plate practical decarburized depth are the important indicators of weighing 8CrV2 hot-rolled steel sheet quality after quenching.The method that adopts the present invention to propose is produced high-quality 8CrV2 hot-rolled steel sheet, and be embodied in the following aspects: (1) structure property is even, and difference of hardness is not more than 2.5HRC after the quench treatment; (2) the monolateral decarburized layer deepness of steel plate is less than 1.2% of thickness.(3) the product scroll is good, does not have the volume phenomenon of collapsing.
Description of drawings
Fig. 1 organizes synoptic diagram for the steel plate that embodiment 1 produces;
Fig. 2 organizes synoptic diagram for the steel plate that embodiment 2 produces;
Fig. 3 organizes synoptic diagram for the steel plate that embodiment 3 produces;
Fig. 4 organizes synoptic diagram for the steel plate that embodiment 4 produces;
Fig. 5 organizes synoptic diagram for the steel plate that embodiment 5 produces.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
Embodiment 1:
The described method of producing the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path of present embodiment, technical process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The chemical component weight per-cent proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C 0.75, and Si 0.20, and Mn 0.30, and P 0.010, and S 0.004, and Cr 0.40, and V 0.15, and all the other are Fe and unavoidable impurities.
Continuous casting and rolling technique of sheet bar parameter: strand charging temperature T
Go intoBe 905 ℃, molten steel overheat T
CrossBe 32 ℃, finishing temperature T
EventuallyBe 855 ℃, coiling temperature T
VolumeBe 555 ℃, continuous casting pulling rate S
Draw3.6m/min continuous casting liquid core is depressed 2mm, slab thickness 68mm, and secondary cooling zone adopts weak cold.
The physical and chemical index of covering slag: fluxing point is 1017 ℃, and basicity is 1.0, and viscosity is 1292 ℃, 1.20 pools, and volume density is 0.78Kg/L.
The microtexture of hot rolled strip is seen Fig. 1, and its performance sees Table 1.
Table 1
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A??％ | Quench the back with plate difference of hardness HRC | Inclusion (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??5.0 | ??740 | ??995 | ??12 | ??1.8 | ??1.0 | ??1.05 | The volume type is good, and volume does not collapse | ??205 |
Embodiment 2:
The described method of producing the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path of present embodiment, technical process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The chemical component weight per-cent proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C 0.85, and Si 0.40, and Mn 0.60, and P 0.023, and S 0.024, and Cr 0.70, and V 0.25, and all the other are Fe and unavoidable impurities.
Continuous casting and rolling technique of sheet bar parameter: strand charging temperature T
Go intoBe 980 ℃, molten steel overheat T
CrossBe 45 ℃, finishing temperature T
EventuallyBe 945 ℃, coiling temperature T
VolumeBe 645 ℃, continuous casting pulling rate S
DrawBe 5.3m/min, continuous casting liquid core is depressed 18mm, slab thickness 52mm, and secondary cooling zone adopts weak cold.
The physical and chemical index of covering slag: fluxing point is 978 ℃, and basicity is 0.90, and viscosity is 1290 ℃, 0.92 pool, and volume density is 0.59Kg/L.
The microtexture of hot rolled strip is seen Fig. 2, and performance sees Table 2.
Table 2
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Inclusion (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??4.2 | ??760 | ??1035 | ??11 | ??2.2 | ??1.0 | ??0.88 | The volume type is good, and volume does not collapse | ??128 |
Embodiment 3:
The method that present embodiment is produced the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path, technical process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The chemical component weight per-cent proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C 0.80, Si0.26, and Mn 0.35, and P 0.011, and S 0.008, and Cr 0.42, and V 0.23, and all the other are Fe and unavoidable impurities.
Continuous casting and rolling technique of sheet bar parameter: strand charging temperature T
Go intoBe 950 ℃, molten steel overheat T
CrossBe 39 ℃, finishing temperature T
EventuallyBe 890 ℃, coiling temperature T
VolumeBe 625 ℃, continuous casting pulling rate S
Draw4.1m/min continuous casting liquid core is depressed 10mm, slab thickness 60mm, and secondary cooling zone adopts weak cold.
The physical and chemical index of covering slag: fluxing point is 1000 ℃, and basicity is 0.90, and viscosity is 1288 ℃, 0.96 pool, and volume density is 0.60Kg/L.
The microtexture of hot rolled strip is seen Fig. 3, and performance sees Table 3.
Table 3
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Inclusion (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??3.6 | ??758 | ??1005 | ??14 | ??1.6 | ??1.0 | ??0.6 | The volume type is good, and volume does not collapse | ??198 |
Embodiment 4
The method that present embodiment is produced the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path, technical process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The chemical component weight per-cent proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C 0.78, and Si 0.35, and Mn 0.50, and P 0.010, and S 0.003, and Cr 0.60, and V 0.25, and all the other are Fe and unavoidable impurities.
Processing parameter: strand charging temperature T
Go intoBe 970 ℃, molten steel overheat T
CrossBe 42 ℃, finishing temperature T
EventuallyBe 900 ℃, coiling temperature T
VolumeBe 615 ℃, continuous casting pulling rate S
Draw4.8m/min continuous casting liquid core is depressed 8mm, slab thickness 62mm, and secondary cooling zone adopts weak cold.
The physical and chemical index of covering slag: fluxing point is 998 ℃, and basicity is 0.91, and viscosity is 1290 ℃, 0.96 pool, and volume density is 0.60Kg/L.
The microtexture of hot rolled strip is seen Fig. 4, can see Table 4.
Table 4
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Inclusion (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??2.55 | ??780 | ??1085 | ??13 | ??1.5 | ??1.0 | ??0.5 | The volume type is good, and volume does not collapse | ??205 |
Embodiment 5
The method that present embodiment is produced the 8CrV2 hot-rolled steel sheet based on bar strip continuous casting and rolling flow path, technical process: the smelting of 150t uhp electric arc furnace, 150t ladle furnace refining, sheet blank continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar flow cool off, batch.
The chemical component weight per-cent proportioning (wt%) that refining process carries out the molten steel after the Alloying Treatment is: C 0.78, Si0.30, and Mn 0.42, and P 0.009, and S 0.001, and Cr 0.62, and V 0.18, and all the other are Fe and unavoidable impurities.
Processing parameter: strand charging temperature T
Go intoBe 1000 ℃, molten steel overheat T
CrossBe 43 ℃, finishing temperature T
EventuallyBe 900 ℃, coiling temperature T
VolumeBe 600 ℃, continuous casting pulling rate S
Draw5.2m/min continuous casting liquid core is depressed 16mm, slab thickness 54mm, and secondary cooling zone adopts weak cold.
The physical and chemical index of covering slag: fluxing point is 997 ℃, and basicity is 0.91, and viscosity is 1290 ℃, 0.94 pool, and volume density is 0.60Kg/L.
The microtexture of hot rolled strip is seen Fig. 5, can see Table 5.
Table 5
| Thickness of strips mm | ??Rel??MPa | ??Rm??MPa | ??A％ | Quench the back with plate difference of hardness HRC | Inclusion (D) | Monolateral decarburized layer deepness % | The volume type | Fatigue and cyclic week (ten thousand times) |
| ??2.0 | ??800 | ??1095 | ??16 | ??1.0 | ??0.5 | ??0.32 | The volume type is good, and volume does not collapse | ??260 |
The every performance index of 8CrV2 hot-rolled steel sheet that this embodiment produces, better than other embodiment.
More than be at the specifying of possible embodiments of the present invention, but this embodiment is not in order to limiting claim of the present invention, does not allly break away from the equivalence that skill spirit of the present invention does and implement or change, all should be contained in the claim of the present invention.
Claims (6)
1. a method of producing the 8CrV2 hot-rolled steel sheet is characterized in that, adopts bar strip continuous casting and rolling flow path, mainly comprise electric furnace or converter smelting, refining, sheet blank continuous casting, strand soaking, hot continuous rolling, laminar flow cooling, batch step,
Wherein, the chemical ingredients that refining process carries out the molten steel after the Alloying Treatment is: C 0.75～0.85wt%, Si 0.20～0.40wt%, Mn 0.30～0.60wt%, P≤0.025wt%, S≤0.025wt%, Cr 0.40～0.70wt%, V 0.15～0.25wt%, all the other are Fe and unavoidable impurities;
The processing parameter of described bar strip continuous casting and rolling flow path is: continuous casting pulling rate S
DrawBe 3.5m/min≤S
Draw≤ 5.5m/min, strand charging temperature T
Go intoBe 900 ℃≤T
Go into≤ 1050 ℃, finishing temperature T
EventuallyBe 850 ℃≤T
Eventually≤ 950 ℃, coiling temperature T
VolumeBe 550 ℃≤T
Volume≤ 650 ℃, secondary cooling zone adopts weak cold, molten steel overheat T
CrossBe 30 ℃＜T
Cross≤ 45 ℃;
The cast of employing covering slag, the physicochemical property of described covering slag is: fluxing point is 997 ± 20 ℃, and basicity is 0.92 ± 0.1, and viscosity is 1290 ± 2 ℃, 0.95 ± 0.3 pool, volume density is 0.60 ± 0.1Kg/L.
2. the production method of 8CrV2 hot-rolled steel sheet according to claim 1, it is characterized in that, the chemical ingredients of described molten steel is: C 0.75～0.85wt%, Si 0.20～0.35wt%, Mn 0.30～0.50wt%, P≤0.010wt%, S≤0.004wt%, Cr 0.40～0.60wt%, V 0.15～0.20wt%, all the other are Fe and unavoidable impurities; The fatigue and cyclic cycle reaches more than 1,500,000 times.
3. the production method of 8CrV2 hot-rolled steel sheet according to claim 1 is characterized in that, described processing parameter also comprises: strand liquid core is depressed L
PressBe 2mm≤L
Press≤ 20mm.
4. according to the production method of each described 8CrV2 hot-rolled steel sheet of claim 1-3, it is characterized in that described strand charging temperature is T
Go intoBe 950 ℃≤T
Go into≤ 1050 ℃.
5. the production method of 8CrV2 hot-rolled steel sheet according to claim 4 is characterized in that, described strand charging temperature T
Go intoBe 1000 ℃≤T
Go into≤ 1050 ℃.
6. according to the production method of each described 8CrV2 hot-rolled steel sheet of claim 1-3, it is characterized in that described coiling temperature T
VolumeBe 580 ℃≤T
Volume≤ 620 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583466A (en) * | 2016-12-14 | 2017-04-26 | 四川德胜集团钒钛有限公司 | Rolled steel hot delivery and hot charging technology |
| CN107419175A (en) * | 2017-07-31 | 2017-12-01 | 武汉钢铁有限公司 | Fatigue life good economical tool steel and its production method |
| CN111676422A (en) * | 2020-06-17 | 2020-09-18 | 苏州翔楼新材料股份有限公司 | Cold-rolled high-carbon steel strip for V-saw blade matrix and production method thereof |
-
2010
- 2010-01-21 CN CN2010100195815A patent/CN101792883B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106583466A (en) * | 2016-12-14 | 2017-04-26 | 四川德胜集团钒钛有限公司 | Rolled steel hot delivery and hot charging technology |
| CN107419175A (en) * | 2017-07-31 | 2017-12-01 | 武汉钢铁有限公司 | Fatigue life good economical tool steel and its production method |
| CN107419175B (en) * | 2017-07-31 | 2019-12-27 | 武汉钢铁有限公司 | Economical tool steel with good fatigue life and production method thereof |
| CN111676422A (en) * | 2020-06-17 | 2020-09-18 | 苏州翔楼新材料股份有限公司 | Cold-rolled high-carbon steel strip for V-saw blade matrix and production method thereof |
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| CN101792883B (en) | 2011-06-15 |
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