CN101186960B - Method for producing wear-resisting hot-rolling steel plate by using furnace rolling machine and steel plate prepared by the same method - Google Patents
Method for producing wear-resisting hot-rolling steel plate by using furnace rolling machine and steel plate prepared by the same method Download PDFInfo
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- CN101186960B CN101186960B CN2007101910080A CN200710191008A CN101186960B CN 101186960 B CN101186960 B CN 101186960B CN 2007101910080 A CN2007101910080 A CN 2007101910080A CN 200710191008 A CN200710191008 A CN 200710191008A CN 101186960 B CN101186960 B CN 101186960B
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Abstract
The invention discloses a production process of using a steckel mill to produce wear-resistant steels and produced steel plates thereof. Selected components of the invention are that C<=0.30%, Mn<= 2.5%, P <= 0.015%, S <= 0.005% and Si <= 2.2%. Continuous casting slab of alloys which includes Cr, Mo, Nb, V and the like (Cr <= 1.3%, Mo <= 0.9%, Nb <= 0.05%, V <= 1.0%) is moderately added. The invention employs warm loading and delivery. Steel plates of medium thickness are flatly rolled on the steckel mill with the employment of TMCP + off-line tempering processes, thin steel plates utilize coil rolling + cooling control + off-line tempering processes, and the uniformity, thinning and intensification of tissue are realized by controlling dynamic recrystallization and meta-dynamic recrystallization in the rough rolling stage, strain accumulation and relaxation process in the finely rolling stage, cooling rate within the range of producing lower bainite, and final cooling temperature between the formation temperature of lower bainite and the formation temperature of martensite by employing the off-line low tempering temperature which is equal to or less than 350 DEG C(<= 350 DEG C), thereby ensuring high-intensity, high ductility and abrasion resistant combination property of the steel plates.
Description
Technical field
The present invention relates to a kind of steel plate and production method thereof, utilize Steckel mill to produce the method for wear-resistant hot rolling steel plate and the steel plate that makes thereof specifically.
Background technology
The wear-resistant hot rolling plate property is good, can be widely used in industries such as mine, coal mine machinery, cement, metallurgy, national defense and military, the main use in wear-resisting equipment industries such as handling machinery, excavator, dump truck, handling equipment, truck, blade, crusher, refuse cleaning and recovery systems.
In the prior art, at present, the method for producing the wear resisting steel hot-rolled steel sheet both at home and abroad mainly contains three kinds of forms.First kind is that the patent No. is 200310119034.4, and patent name is the patent of " wear-resisting steel plate of the easy flame cutting of a kind of high hardness high toughness and preparation method thereof ", and this method adopts hardening and tempering method, obtains martensitic stucture.Second kind is that the patent No. is 200510025978.4, and patent name is the patent of " process for preparing bainite antiwear steel plate ", and this method adopts rolls back air cooling or slow cooling acquisition bainite.The third is that the patent No. is 200380103628.4, patent name is the patent of " preparing the method for wear-resisting steel plate and the steel plate that makes thus ", this method adopts hot-rolled steel sheet to quench and obtains martensitic structure or martensite/bainite structure, also comprises retained austenite and the carbide of 5-20%.Up to the present, also there is not method can on the Steckel mill production line, produce the wear-resistant hot rolling steel plate.
Summary of the invention
The objective of the invention is to propose a kind of method of Steckel mill production wear-resistant hot rolling steel plate and steel plate that makes thereof of utilizing.
Purpose of the present invention can be achieved through the following technical solutions:
Utilize Steckel mill to produce the method for wear-resistant hot rolling steel plate, continuous casting steel billet temperature dress temperature is delivered to the process furnace heating, send Steckel mill rolling again, finishing temperature is controlled at more than the Ar3, final cooling temperature is controlled between lower bainite formation temperature and the martensite formation temperature, speed of cooling is controlled at lower bainite and forms within the required cooling rate scope, by control rough rolling step passage strain and Strain Accumulation, realize dynamic recrystallization and inferior dynamic recrystallization and refine austenite crystal grain, control finish rolling stage Strain Accumulation and finish to gauge are exported to the relaxation process of the residence time between the cold inlet of control and realize the refinement of austenite subgrain, rolling wear resisting steel steel plate on Steckel mill, carry out the tempering of low temperature off-line again, produce the wear-resistant hot rolling steel plate.
The steel plate that the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate makes, this steel plate contains the interpolation element of iron and following weight per-cent:
C：0.15～0.26％，
Mn：1.6～2.1％，
P：0～0.015％，
S：0～0.005％，
Si：1.6～2.0％，
Cr：0.6～1.0％，
Mo：0.3～0.6％，
Nb：0.015～0.045％，
V：0.05～0.080％。
Purpose of the present invention can also further realize by following technical measures:
The aforesaid method of utilizing Steckel mill to produce the wear-resistant hot rolling steel plate, the temperature of wherein warm load cast panel base is 150 ℃～550 ℃, process furnace internal heating to 1150 ℃～1250 ℃.
The aforesaid method of utilizing Steckel mill to produce the wear-resistant hot rolling steel plate, wherein low temperature off-line tempered temperature≤350 ℃.
The aforesaid method of utilizing Steckel mill to produce the wear-resistant hot rolling steel plate, intermediate gauge steel plate for steel plate thickness 〉=14mm, behind the process furnace internal heating, deliver to put down on the Steckel mill roll or two base staggered rolling, adopt controlled rolling and controlled cooling (TMCP) and off-line tempering process then, the finishing temperature in control finish rolling stage is between 800～900 ℃, control finish rolling stage passage strain stress＞1, realize the subgrainization of austenite crystal by Strain Accumulation, controlled chilling speed 〉=5 ℃/s again, with control final cooling temperature 〉=530 ℃, and under temperature≤350 ℃, carry out low-temperaturetempering, rolling wear resisting steel steel plate on Steckel mill.
The aforesaid method of utilizing Steckel mill to produce the wear-resistant hot rolling steel plate, the wherein said pair of base is staggered when rolling, temperature is treated in the swing of laminar flow cooling zone after moving forward to machine after first rolled piece roughing ends, simultaneously, second rolled piece come out of the stove and sent Steckel mill rolling, and second rolled piece roughing at the end moves on the roller-way in thick dephosphorization zone swing and treat temperature, simultaneously, first rolled piece turns back to and continues to treat temperature on the roller-way before the inlet side coiler furnace up to by the time finish rolling stage during start rolling temperature, and feed mill continues rolling; First rolling finishing when the temperature of second rolled piece reaches the finish rolling start rolling temperature, continues rolling second rolled piece.
The aforesaid method of utilizing Steckel mill to produce the wear-resistant hot rolling steel plate, thin specification steel plate for steel plate thickness＜14mm, behind the process furnace internal heating, deliver to and carry out controlled rolling on the Steckel mill, adopt the cold and off-line tempering process of control then, the finishing temperature in control finish rolling stage is between 800～900 ℃, control finish rolling stage true strain accumulation＞1, realize the subgrainization of austenite crystal by Strain Accumulation, controlled chilling speed 〉=5 ℃/s again, with control final cooling temperature 〉=530 ℃, and under temperature≤350 ℃, carry out low-temperaturetempering, rolling wear resisting steel steel plate on Steckel mill.
The aforesaid method of utilizing Steckel mill production wear-resistant hot rolling steel plate is wherein rolled up when rolling on the rolled piece Steckel mill, adopts the flat mode of rolling at rough rolling step, adopts volume to roll mode in the finish rolling stage, utilizes two coiler furnaces of milling train front and back, and reciprocating type volume rolls.
Advantage of the present invention is: 1. the present invention uses Steckel mill also can produce the wear resisting steel hot-rolled steel sheet.2. temperature dress is asked and is sent slab, send on the Steckel mill rollingly, and thick steel plates adopts the intermediate gauge steel plate, and (〉=14mm) flat rolling (also can adopt two bases staggered rolling) on Steckel mill adopted the tempering of TMCP+ off-line; Thin specification steel plate adopts volume to roll+control cold+off-line tempering on Steckel mill, has the advantages that flow process is short, cost is low.3. use the rolling wear resisting steel steel plate of Steckel mill, have characteristics such as homogeneous microstructure on intensity height, the elongated length direction, the high and thick degree direction of hardness hardness be even.
Advantage of the present invention and characteristics will illustrate by the non-limitative illustration of following preferred embodiment and explain.
Description of drawings
Fig. 1 is the exemplary x-ray figure of NR360 wearing plate (20mm).
Fig. 2 is the exemplary x-ray figure of NR400 wearing plate (25mm).
Fig. 3 is the TEM photo of NR360 wearing plate (25mm).
Fig. 4 is the enlarged photograph of Fig. 3.
Fig. 5 is the TEM photo of NR400 (25mm).
Fig. 6 is the enlarged photograph of Fig. 5.
Fig. 7 is NR360 (10mm) TEM photo.
Fig. 8 is the enlarged photograph of Fig. 7.
Fig. 9 is the paralympic diffraction pattern photo of Fig. 8.
Figure 10 is the dark field image photo of Fig. 8 correspondence.
Embodiment
Embodiment one
Present embodiment adopts the composition of low carbon and high silicon, its mass percent is: component content is: C:0.15～0.26%, Mn:1.6～2.1%, P≤0.015%, S≤0.005%, Si:1.6～2.0%, add proper C r, Mo, alloy such as Nb and V (Cr:0.6～1.0%, Mo:0.3～0.6%, Nb:0.015～0.045%, V:0.05～0.080%), give full play to C, Si, Mn, Mo, V, Nb, the comprehensive action of Cr, producing thickness on Steckel mill is 20mm, 30mm, the NR400 wear-resisting steel plate that is 25mm with NR360 wear-resisting steel plate and the thickness of 40mm.
During concrete enforcement, flat rolling on Steckel mill, rolling 20mm, 30mm and the NR360 steel plate of 40mm and the NR400 steel plate that thickness is 25mm adopt TMCP technology, by the dynamic and inferior dynamic recrystallization of rough rolling step, realize the homogenizing and the refinement of austenite crystal.Finishing temperature by the control finish rolling stage is controlled between 800～900 ℃, by control finish rolling stage passage strain stress＞1 and control relaxation process, promptly realizes the subgrainization of austenite crystal by Strain Accumulation.Again by rate of cooling being controlled at 〉=5 ℃/s and final cooling temperature 〉=530 ℃, under temperature≤350 ℃, carry out low-temperaturetempering.Simultaneously, adopted two bases rolling mode that interlocks, reached the effect that reduces energy consumption, enhances productivity, that is: move forward to machine after first slab rough rolling ended after the swing of laminar flow cooling zone treat temperature; Simultaneously, second rolled piece come out of the stove and sent Steckel mill rolling, second rolled piece roughing at the end move to thick dephosphorization zone roller-way on swing treat temperature, simultaneously first rolled piece turns back to and continues to treat temperature on the roller-way before the inlet side coiler furnace up to by the time finish rolling stage during start rolling temperature, and feed mill continues rolling.First rolling finishing when the temperature of second rolled piece reaches the finish rolling start rolling temperature, continues rolling second rolled piece.Average time of staying temperature when like this, having shortened 2 rolled piece controlled rollings.
The thickness that obtains is that the NR360 wear-resisting steel plate of 20mm, 30mm and 40mm and the performance of the NR400 wear-resisting steel plate that thickness is 25mm see Table 1:
Table 1
| Steel grade | Thickness mm | Yield strength Rel | Tensile strength Rm | Unit elongation A50% | AKV1 | AKV2 | AKV3 | AKV is average | HB | Clod wash |
| NR360 | 20 | 1085 | 1305 | 14.5 | 98 | 78 | 70 | 82 | 375 | Qualified |
| NR360 | 30 | 1090 | 1280 | 18 | 78 | 130 | 54 | 87 | 364 | Qualified |
| Steel grade | Thickness mm | Yield strength Rel | Tensile strength Rm | Unit elongation A50% | AKV1 | AKV2 | AKV3 | AKV is average | HB | Clod wash |
| NR360 | 40 | 1005 | 1190 | 8 | 52 | 48 | 74 | 58 | 366 | Qualified |
| NR400 | 25 | 1120 | 1320 | 18.5 | 76 | 58 | 51 | 62 | 390 | Qualified |
Paralympic content measurement X-ray diffraction measuring method standard in the steel, measurement standard: GB8362-1987, adopt programmable Dquant quantitation software to calculate austenite (γ) γ (200), γ (220), (α) α (200) of γ (311) and ferrite structure, the clean integrated intensity of (211) five diffraction peaks of α, and calculate paralympic content in the steel in view of the above, the exemplary x-ray figure of NR360 wearing plate (20mm) as shown in Figure 1, the exemplary x-ray figure of NR400 wearing plate (25mm) as shown in Figure 2, thickness is 20mm, 30mm, the paralympic content (wt.%) of the NR400 wear-resisting steel plate that is 25mm with NR360 wear-resisting steel plate and the thickness of 40mm sees Table 2:
Table 2
| Thickness of slab | Steel grade | α200- γ200 | α200- γ220 | α200- γ113 | α112- γ200 | α112- γ220 | α112- γ113 | On average |
| 20mm | NR360 | 12.90 | 12.10 | 10.30 | 10.20 | 10.20 | 8.70 | 10.70 |
| 30mm | NR360 | 13.10 | 8.5 | 2.9 | 5.9 | 7.2 | 2.6 | 5.4 |
| 40mm | NR360 | 9.50 | 13.00 | 9.90 | 7.40 | 10.70 | 8.10 | 9.80 |
| 25mm | NR400 | 13.10 | 8.5 | 9.9 | 6.2 | 8.2 | 8.6 | 9.1 |
The TEM photo of NR360 wearing plate (25mm) as shown in Figure 3, Fig. 4 is the enlarged view of Fig. 3, figure middle plate strip shape is a bainite, black book sheet is paralympic.This advantage that adds the microstructure that residual austenite forms by tiny carbides-free lower bainite is to obtain good combination of strength and toughness.
The TEM photo of NR400 (25mm) as shown in Figure 5, Fig. 6 is the enlarged view of Fig. 5, figure middle plate strip shape is a bainite, black book sheet is paralympic.This advantage that adds the microstructure that residual austenite forms by tiny carbides-free lower bainite is to obtain good combination of strength and toughness.
Embodiment two
Present embodiment adopts the composition of low carbon and high silicon, its mass percent is: component content is: C:0.15～0.26%, Mn:1.6～2.1%, P≤0.015%, S≤0.005%, Si:1.6～2.0%, add proper C r, Mo, alloy such as Nb and V (Cr:0.6～1.0%, Mo:0.3～0.6%, Nb:0.015～0.045%, V:0.05～0.080%), give full play to C, Si, Mn, Mo, V, Nb, the comprehensive action of Cr, producing thickness on Steckel mill is 10mm, 12mm, the NR360 wear-resisting steel plate of 14mm and thickness are 10mm, the NR400 wear-resisting steel plate of 12mm.
During concrete enforcement, adopt to adopt to roll up on Steckel mill and roll, adopt traditional flat mode of rolling in former passages, a few passage rolled pieces in back adopt volume to roll mode, utilize two coiler furnaces of milling train front and back, and reciprocating type volume rolls.Similar with thick specification, by the dynamic and inferior dynamic recrystallization of rough rolling step, realize the homogenizing and the refinement of austenite crystal; Finishing temperature (simultaneously rolling control coiler furnace temperature in the process) by the control finish rolling stage, be controlled between 800-900 ℃ at volume, realize the subgrainization of austenite crystal by the Strain Accumulation in control finish rolling stage, by rate of cooling being controlled at 5 ℃/s and final cooling temperature 〉=530 ℃, under≤350 ℃, carry out the production process of low-temperaturetempering again.The steel plate of thin specification, this volume of this employing rolls mode, makes the homogeneity of temperature homogeneity, tissue on the length of rolled piece direction, plate shape all be better than traditional milling train.
The thickness that obtains is the NR360 wear-resisting steel plate of 10mm, 12mm, 14mm and the performance such as the table 3 of the NR400 wear-resisting steel plate that thickness is 10mm, 12mm:
Table 3
| Steel grade | Thickness mm | Yield strength Rel | Tensile strength Rm | Unit elongation A50% | AKV1 | AKV2 | AKV3 | AKV is average | HB | Clod wash |
| NR360A | 10 | 985 | 1225 | 10 | 34 | 36 | 35 | 35 | 365 | Qualified |
| NR360A | 12 | 1070 | 1275 | 21 | 54 | 52 | 48 | 51 | 356 | Qualified |
| NR400 | 10 | 1120 | 1330 | 17 | 50 | 48 | 52 | 50 | 397 | Qualified |
| NR400 | 12 | 1035 | 1325 | 20.5 | 74 | 57 | 52 | 61 | 386 | Qualified |
The thick NR360 wearing plate of 10mm is organized as the lower bainite+paralympic content of interface carbides-free, and paralympic content (wt.%) is as table 4:
Table 4
| Thickness of slab | α200- γ200 | α200- γ220 | α200- γ113 | α112- γ200 | α112- γ220 | α112- γ113 | On average |
| 10mm | 9.90 | 2.90 | 9.30 | 6.50 | 2.00 | 6.50 | 6.20 |
The book specification wearing plate typical case transmission electron microscope tissue topography that Fig. 7～Figure 10 produces for adopting the volume roll process, Fig. 7 is the lath-shaped bainite, and Fig. 8 is the tissue after amplifying, and black book sheet is paralympic.Observation shows that the lath of bainite width is 300nm～1 μ m for most, in the lath, do not see have carbide to separate out between lath, residual austenite book sheet is arranged between lath.Fig. 9 is diffraction pattern and the calibration result of residual austenite, and Figure 10 is the dark field image corresponding with Fig. 8 figure, diffraction pattern.Dark field image confirms that all the book sheet between lath of bainite is a residual austenite.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (6)
1. utilize Steckel mill to produce the method for wear-resistant hot rolling steel plate, it is characterized in that: continuous casting steel billet temperature dress temperature is delivered to the process furnace heating, send Steckel mill rolling again, finishing temperature is controlled at more than the Ar3, final cooling temperature is controlled between lower bainite formation temperature and the martensite formation temperature, speed of cooling is controlled at lower bainite and forms within the required cooling rate scope, by control rough rolling step passage strain and Strain Accumulation, realize dynamic recrystallization and inferior dynamic recrystallization and refine austenite crystal grain, control finish rolling stage Strain Accumulation and finish to gauge are exported to the relaxation process of the residence time between the cold inlet of control and realize the refinement of austenite subgrain, rolling wear resisting steel steel plate on Steckel mill, carry out the tempering of low temperature off-line again, produce the wear-resistant hot rolling steel plate; The temperature of described temperature load cast panel base is 150 ℃～550 ℃, process furnace internal heating to 1150 ℃～1250 ℃; Described low temperature off-line tempered temperature≤350 ℃.
2. the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate as claimed in claim 1, it is characterized in that: for the intermediate gauge steel plate of steel plate thickness 〉=14mm, behind the process furnace internal heating, deliver to put down on the Steckel mill roll or two base staggered rolling, adopt controlled rolling and controlled cooling and off-line tempering process then, the finishing temperature in control finish rolling stage is between 800～900 ℃, control finish rolling stage passage strain stress＞1, realize the subgrainization of austenite crystal by Strain Accumulation, controlled chilling speed 〉=5 ℃/s again, with control final cooling temperature 〉=530 ℃, and under temperature≤350 ℃, carry out low-temperaturetempering, rolling wear resisting steel steel plate on Steckel mill.
3. the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate as claimed in claim 2, it is characterized in that: the described pair of base is staggered when rolling, temperature is treated in the swing of laminar flow cooling zone after moving forward to machine after first rolled piece roughing ends, simultaneously, second rolled piece come out of the stove and sent Steckel mill rolling, second rolled piece roughing at the end moves on the roller-way in thick dephosphorization zone swing and treats temperature, simultaneously, first rolled piece turns back to and continues to treat temperature on the roller-way before the inlet side coiler furnace up to by the time finish rolling stage during start rolling temperature, and feed mill continues rolling; First rolling finishing when the temperature of second rolled piece reaches the finish rolling start rolling temperature, continues rolling second rolled piece.
4. the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate as claimed in claim 1, it is characterized in that: for the thin specification steel plate of steel plate thickness＜14mm, behind the process furnace internal heating, deliver to and carry out controlled rolling on the Steckel mill, adopt the cold and off-line tempering process of control then, the finishing temperature in control finish rolling stage is between 800～900 ℃, control finish rolling stage true strain accumulation＞1, realize the subgrainization of austenite crystal by Strain Accumulation, controlled chilling speed 〉=5 ℃/s again, with control final cooling temperature 〉=530 ℃, and under temperature≤350 ℃, carry out low-temperaturetempering, rolling wear resisting steel steel plate on Steckel mill.
5. the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate as claimed in claim 4, it is characterized in that: when carrying out controlled rolling on the rolled piece Steckel mill, adopt the flat mode of rolling, adopt volume to roll mode in the finish rolling stage at rough rolling step, utilize two coiler furnaces of milling train front and back, reciprocating type volume rolls.
6. the steel plate that the method for utilizing Steckel mill to produce the wear-resistant hot rolling steel plate as claimed in claim 1 makes, it is characterized in that: this steel plate contains the interpolation element of iron and following weight per-cent:
C：0.15～0.26％，
Mn：1.6～2.1％，
P：0～0.015％，
S：0～0.005％，
Si：1.6～2.0％，
Cr：0.6～1.0％，
Mo：0.3～0.6％，
Nb：0.015～0.045％，
V：0.05～0.080％。
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| CN102323981A (en) * | 2011-08-26 | 2012-01-18 | 首钢总公司 | Method for predicting hot rolled steel austenite static recrystallization structure evolution |
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| CN112522489A (en) * | 2020-11-30 | 2021-03-19 | 安徽工业大学 | Method for realizing structure refinement by utilizing ultrafine austenite reinforced phase transformation |
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| CN102323981A (en) * | 2011-08-26 | 2012-01-18 | 首钢总公司 | Method for predicting hot rolled steel austenite static recrystallization structure evolution |
| CN102323981B (en) * | 2011-08-26 | 2014-04-02 | 首钢总公司 | Method for predicting hot rolled steel austenite static recrystallization structure evolution |
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