CN101338399A - Carbides-free bainite wear resistant steel plate and production process thereof - Google Patents
Carbides-free bainite wear resistant steel plate and production process thereof Download PDFInfo
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Abstract
The invention relates to a steel and a production technique thereof, in particular to a non-carbide bainite wear-resistant steel plate and a production technique thereof; the component weight percentages are: 0.15 to 0.25 percent of C, 1.50 to 2.00 percent of Mn, 0 to 0.015 percent of P, 0 to 0.006 percent of S, 1.30 to 2.00 percent of Si, 0.20 to 0.60 percent of Al, 0.60 to 1.00 percent of Cr, 0.25 to 0.50 percent of Mo, 0.010 to 0.035 percent of Nb and the rest is Fe. The production technique is carried out according to the following working procedures: (1) feeding a continuous casting plate to a heating furnace for heating; (2) feeding the continuous casting plate after being heated into a hot rolling production line to carry out the rolling of controlled rolling and controlled cooling; (3) carrying out middle-low temperature drawing temper on a rolling steel plate after the rolling is finished. The non-carbide bainite wear-resistant steel plate can be produced by the working procedures without carrying out online or offline hardening and tempering thermal processing which not only can simplify the working procedures of production, but also can improve the performance and the quality of a product as well as obtain the bainite wear-resistant steel with high intensity and high toughness.
Description
Technical field
The present invention relates to a kind of steel plate and production technique thereof, a kind of specifically carbides-free bainite wear resistant steel plate and production technique thereof.
Background technology
The high-strong toughness wear-resisting steel plate is as the important iron structure material of a class, and excellent comprehensive performances such as requiring to have high-strong toughness, high rigidity, can weld, be wear-resisting is widely used in industries such as mining machinery, shipping vehicle, bridge and engineering machinery.
External high-strong toughness wear-resisting steel plate manufacturing technology is to adopt to roll the online direct quenching technology in back, and its chemical composition design adopts low-carbon (LC) and a small amount of alloying element, and the quality adjustment condition supply of material down mainly is organized as tempered martensite.Characteristics such as wear-resisting steel plate has that alloy content is low relatively, high-strong toughness, high rigidity and weldability.In recent years, domestic many steel plate factory has also begun to strengthen the exploitation dynamics of high-strong toughness wear-resisting steel plate, quenching added average tempering technology after off-line reheated austenitizing after main employing was rolled, tissue is mainly tempered martensite, but problem such as the high-strength abrasion-proof steel plate of producing often exists hardness inequality, manufacturing cost height, plate shape is relatively poor and toughness is lower.
Bainite wear-resisting steel is a kind of of high-strong toughness wear-resisting steel plate, and Bainite wear-resisting steel has the characteristic of high strength and excellent toughness.Produce Bainite wear-resisting steel at present both at home and abroad following patent is arranged: the patent No. is 95103148.1, patent name is the patent of " a kind of low alloy Bainite wear-resisting steel ", this method adopts medium carbon low alloy steel (air cooling) under continuous cooling conditions to obtain the martensite-bainite heterogeneous structure, is mainly used in wet-milling and need withstands shocks the bigger workpiece of load.The patent No. is 200510025978.4, patent name is the patent of " process for preparing bainite antiwear steel plate ", this method adopts the bag endomorphism to handle, and rolls back air cooling or slow cooling and obtains bainite, particularly a kind of blade board that is applicable to loop wheel machine grab bucket or scraper scraper bowl etc.The patent No. is 200510032524.X, and patent name is the patent of " high-strength casted air-colled bainite wear-resisting steel and preparation method thereof ", and this method is to take to cast the Bainite wear-resisting steel that method for air-cooling obtains with medium carbon low alloy steel.The patent No. is 200510079346.6, patent name is the patent of " ultra-fine Bainite wear-resisting steel and manufacturing process thereof ", this method is to adopt a kind of high-carbon MnCrWSiAlV series low-alloy steel, obtains the residual austenite tissue of ultra-fine bainite structure and a small amount of high-carbon content after special thermal treatment.The patent No. is 96192013.0, patent name is the patent of " improved non-carbide bainitic steel and production method thereof ", this method is a kind of bainitic steel of producing the essentially no carbide of its microstructure of wear-resisting and anti-roll extrusion contact fatigue, is mainly used in to produce rail and crane runway etc.More than the bainite antiwear steel plate produced of each method separately characteristic is all arranged, but technology is still complicated, product strength and toughness are not very high.
Summary of the invention
Technical problem to be solved by this invention is: propose a kind of carbides-free bainite wear resistant steel plate and production technique thereof, both can simplify production process, can enhance product performance again and quality product, obtain the Bainite wear-resisting steel of high-intensity high-tenacity.
The technical scheme that the present invention solves above technical problem is: the composition weight percent of carbides-free bainite wear resistant steel plate is: C:0.15～0.25%, Mn:1.50～2.00%, P:0～0.015%, S:0～0.006%, Si:1.30～2.00%, Al:0.20～0.60%, Cr:0.60～1.00%, Mo:0.25～0.50%, Nb:0.010～0.035%, Fe: surplus.
The production technique of carbides-free bainite wear resistant steel plate is undertaken by following operation: (1) delivers to the process furnace heating with continuous casting steel billet; (2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling; (3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back.Can produce carbides-free bainite wear resistant steel plate by above operation, need not to carry out the modified thermal treatment of online or off-line.
In the above operation (1), continuous casting steel billet is process furnace internal heating to 1150 ℃～1250 ℃, and tapping temperature is 1200 ± 10 ℃.In the above operation (2), the finishing temperature in control finish rolling stage between 800 ℃～900 ℃, control finish rolling stage passage strain stress＞1, controlled chilling speed 〉=5 ℃/s, the control final cooling temperature is at 530 ℃～650 ℃.In the above operation (3), the tempering range that middle low-temperaturetempering is handled is 300 ℃～360 ℃.
Advantage of the present invention is: 1. by the cda alloyization of elements such as Mo, Mn, Cr, improve the hardening capacity of steel bainite, in the hope of obtaining bainite structure; 2. by silicon and aluminium element, strongly inhibited is decomposed with the carbide that delays supercooled austenite, in conjunction with other alloy element action, makes steel obtain the bainite structure that carbides-free is separated out, thereby when improving wear resisting steel intensity and hardness, has guaranteed high tenacity; 3. by adding a certain amount of aluminium, reduced the silicone content of actual adding, thereby effectively reduced continuously cast bloom crackle rate; 4. take controlled rolling and technology for controlled cooling, guarantee to obtain tiny and uniform bainite structure; 5. by cooling controlling and rolling controlling process technology on the hot rolling line, directly obtain the high-strong toughness Bainite wear-resisting steel, need not to carry out the modified thermal treatment of online or off-line, low-temperaturetempering eliminates stress in only adopting, improve toughness, because the adding of alloying element has improved anti-tempering ability greatly, middle low-temperaturetempering is less to steel plate hardness and intensity effect; 6. need not to carry out the modified thermal treatment of online or off-line, only eliminate stress, can save energy and reduce the cost, simplified production process carbides-free bainite wear resistant steel plate 7. of the present invention and not only had high strength and high rigidity with low-temperaturetempering in adopting, also have good toughness, its mechanical property sees table 1 for details:
Table 1
| Thickness of slab mm | Yield strength Rel, MPa | Tensile strength Rm, MPa | Elongation after fracture A50, % | 0 ℃ of impelling strength A KV，J | Hardness HB |
| 20～40 | ≥900 | ≥1100 | ≥10 | ≥30 | ≥330 |
Description of drawings
Fig. 1 is the XRD figure spectrum of carbides-free bainite wear resistant steel plate of the present invention.
Fig. 2 is the metallographic structure photo of carbides-free bainite wear resistant steel plate of the present invention.
Fig. 3 is the stereoscan photograph of carbides-free bainite wear resistant steel plate of the present invention.
Fig. 4 is the transmission electron microscope photo of carbides-free bainite wear resistant steel plate of the present invention.
Fig. 5 is the diffraction pattern photo of residual austenite among Fig. 4.
Embodiment
The composition weight percent of carbides-free bainite wear resistant steel plate of the present invention is: C:0.15～0.25%, Mn:1.50～2.00%, P:0～0.015%, S:0～0.006%, Si:1.30～2.00%, Al:0.20～0.60%, Cr:0.60～1.00%, Mo:0.25～0.50%, Nb:0.010～0.035%, Fe: surplus.Alloying element mainly acts on as follows:
1. carbon: improve intensity, hardness and wear resistance, but influence toughness and weldability, so among the present invention carbon content is controlled to be 0.15～0.25%.
2. manganese: manganese improves the stability of supercooled austenite, postpones the effect of perlitic transformation strongly, obtains high bainite hardening capacity, but the too high easy generation segregation of manganese, so among the present invention manganese content is controlled to be 1.50～2.00%.
3. silicon: the main alloy element of carbides-free bainite wear resistant steel plate among the present invention, it mainly acts on is that strongly inhibited and the carbide that delays supercooled austenite decompose, improve stabilization of austenite, in controlled rolling and controlled cooling, obtain the carbide-free Bainite tissue, to improve obdurability, but the Si too high levels easily causes the continuously cast bloom cracking, so among the present invention silicone content is controlled to be 1.30～2.00%.
4. aluminium: close with the effect of silicon, the carbide that can suppress and delay supercooled austenite decomposes, and for reducing the influence of high silicon to the continuously cast bloom crackle, adding aluminium among the present invention is 0.20～0.60%.
5. molybdenum: molybdenum has to be strengthened and improves anti-tempering ability, and prevent temper brittleness, and can improve the hardening capacity of bainite greatly, be the one of the chief elements of bainitic steel, so among the present invention molybdenum content is controlled to be 0.25%～0.50%.
6. chromium: chromium and molybdenum have similar action, but not as molybdenum strong, so among the present invention chromium content is controlled to be 0.60%～1.00%.
7. niobium: niobium can play the dual function of crystal grain thinning and precipitation strength in the controlled rolling process, so among the present invention content of niobium is controlled to be 0.010～0.035%.
8. phosphorus, sulphur: the sulphur phosphorus content is controlled at respectively less than 0.015% and 0.006%.
Embodiment one
The composition weight percent of the carbides-free bainite wear resistant steel plate of present embodiment is: C:0.15%, Mn:1.50%, P:0%, S:0.006%, Si:1.30%, Al:0.60%, Cr:0.60%, Mo:0.25%, Nb:0.010%, Fe: surplus.
The production technique of above carbides-free bainite wear resistant steel plate is undertaken by following operation:
(1) continuous casting steel billet is delivered to process furnace internal heating to 1200 ℃, tapping temperature is controlled at 1200 ± 10 ℃.
(2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling, adopt two stage rolling, the finishing temperature in control finish rolling stage is controlled finish rolling stage passage strain stress＞1 at 880 ℃, controlled chilling speed 〉=5 ℃/s, the control final cooling temperature is at 580 ℃.
(3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back, and tempering temperature is 320 ℃ ± 10 ℃, is incubated 10 hours, the cooling in heap of coming out of the stove.
Embodiment two
The composition weight percent of the carbides-free bainite wear resistant steel plate of present embodiment is: C:0.25%, Mn:2.00%, P:0.015%, S:0%, Si:2.00%, Al:0.20%, Cr:1.00%, Mo:0.50%, Nb:0.035%, Fe: surplus.
The production technique of above carbides-free bainite wear resistant steel plate is undertaken by following operation:
(1) continuous casting steel billet is delivered to process furnace internal heating to 1250 ℃, tapping temperature is controlled at 1200 ± 10 ℃.
(2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling, adopts two stage rolling, and the finishing temperature in control finish rolling stage is at 870 ℃, control finish rolling stage passage strain stress＞1, controlled chilling speed 〉=10 ℃/s, control final cooling temperature are at 630 ℃, aligning.(3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back, and tempering temperature is 350 ℃ ± 10 ℃, is incubated 12 hours, the cooling in heap of coming out of the stove.
Embodiment three
The composition weight percent of present embodiment carbides-free bainite wear resistant steel plate is: C:0.20%, Mn:1.6%, P:0.01%, S:0.004%, Si:1.50%, Al:0.40%, Cr:0.80%, Mo:0.30%, Nb:0.020%, Fe: surplus.
The production technique of above carbides-free bainite wear resistant steel plate is undertaken by following operation:
(1) continuous casting steel billet is delivered to process furnace internal heating to 1250 ℃, tapping temperature is controlled at 1200 ± 10 ℃.
(2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling, adopts two stage rolling, and the finishing temperature in control finish rolling stage is at 860 ℃, control finish rolling stage passage strain stress＞1, controlled chilling speed 〉=5 ℃/s, control final cooling temperature are at 590 ℃, aligning.
(3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back, and tempering temperature is 330 ℃ ± 10 ℃, is incubated 12 hours, the cooling in heap of coming out of the stove.
Embodiment four
The composition weight percent of the carbides-free bainite wear resistant steel plate of present embodiment is: C:0.22%, Mn:1.8%, P:0.013%, S:0.003%, Si:1.7%, Al:0.50%, Cr:0.7%, Mo:0.4%, Nb:0.030%, Fe: surplus.
The production technique of above carbides-free bainite wear resistant steel plate is undertaken by following operation:
(1) continuous casting steel billet is delivered to process furnace internal heating to 1250 ℃, tapping temperature is controlled at 1200 ± 10 ℃.
(2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling, adopts two stage rolling, and the finishing temperature in control finish rolling stage is at 870 ℃, control finish rolling stage passage strain stress＞1, controlled chilling speed 〉=5 ℃/s, control final cooling temperature are at 600 ℃, aligning.
(3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back, and tempering temperature is 340 ℃ ± 10 ℃, is incubated 12 hours, the cooling in heap of coming out of the stove.
Fig. 1 is the XRD figure spectrum of carbides-free bainite wear resistant steel plate of the present invention, and phase composite is mainly α phase (bainite) and a small amount of γ phase (residual austenite) as seen from the figure.
Fig. 2 is the metallographic structure photo of carbides-free bainite wear resistant steel plate of the present invention, and wear-resisting steel plate is organized as tiny ferrite bainite tissue as seen from the figure.
Fig. 3 is the stereoscan photograph of carbides-free bainite wear resistant steel plate of the present invention, can be seen the high power pattern of ferrite bainite tissue by figure.
Fig. 4 is the transmission electron microscope photo of carbides-free bainite wear resistant steel plate of the present invention, can see the residual austenite tissue that has the black thin film shape between white bright ferrite bainite by figure, does not see have carbide to separate out in the lath of bainite and between lath.
Fig. 5 is the diffraction pattern photo of residual austenite among Fig. 4, confirms that the black foil that reaches between inferior lath between lath of bainite is paralympic.
The present invention can also have other embodiment, and all employings are equal replaces or technical scheme that equivalent transformation forms, all drops on the scope of protection of present invention in this.
Claims (5)
1. carbides-free bainite wear resistant steel plate, its composition weight percent is: C:0.15～0.25%, Mn:1.50～2.00%, P:0～0.015%, S:0～0.006%, Si:1.30～2.00%, Al:0.20～0.60%, Cr:0.60～1.00%, Mo:0.25～0.50%, Nb:0.010～0.035%, Fe: surplus.
2. the production technique of carbides-free bainite wear resistant steel plate as claimed in claim 1 is characterized in that: comprise following operation:
(1) continuous casting steel billet is delivered to the process furnace heating;
(2) continuous casting steel billet after will heating is delivered to hot rolling line to carry out controlled rolling and controlled cooling rolling;
(3) low-temperaturetempering was handled during carried out rolled sheet material rolling intact back, obtained carbides-free bainite wear resistant steel plate.
3. the production technique of carbides-free bainite wear resistant steel plate as claimed in claim 2 is characterized in that: in the described operation (1), continuous casting steel billet is process furnace internal heating to 1150 ℃～1250 ℃, and tapping temperature is 1200 ± 10 ℃.
4. the production technique of carbides-free bainite wear resistant steel plate as claimed in claim 2, it is characterized in that: in the described operation (2), the finishing temperature in control finish rolling stage is between 800 ℃～900 ℃, control finish rolling stage passage strain stress＞1, controlled chilling speed 〉=5 ℃/s, the control final cooling temperature is at 530 ℃～650 ℃.
5. the production technique of carbides-free bainite wear resistant steel plate as claimed in claim 2 is characterized in that: in the described operation (3), the tempering range that middle low-temperaturetempering is handled is 300 ℃～360 ℃.
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| CN101880831A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof |
| WO2018006845A1 (en) * | 2016-07-06 | 2018-01-11 | 马钢(集团)控股有限公司 | High toughness bainitic steel wheel for rail transit, and manufacturing method therefor |
| CN110885950A (en) * | 2019-10-30 | 2020-03-17 | 鞍钢股份有限公司 | High-strength and high-toughness steel rail for crane and manufacturing method thereof |
| CN111471929A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for quality-adjustment-free gear and production method thereof |
| CN111471934A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN111471938A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for electric automobile gear and production method thereof |
| CN114058945A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | High-strength bainite wear-resistant steel plate and production method thereof |
| CN114850365A (en) * | 2022-04-19 | 2022-08-05 | 中国恩菲工程技术有限公司 | Bainite-based grinding medium and preparation method and application thereof |
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2008
- 2008-08-14 CN CNB2008100216975A patent/CN100567549C/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101880831A (en) * | 2010-06-13 | 2010-11-10 | 东北大学 | High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof |
| CN101880831B (en) * | 2010-06-13 | 2012-07-04 | 东北大学 | High-strength-and-toughness low alloy wear resistant steel and manufacturing method thereof |
| WO2018006845A1 (en) * | 2016-07-06 | 2018-01-11 | 马钢(集团)控股有限公司 | High toughness bainitic steel wheel for rail transit, and manufacturing method therefor |
| CN110885950A (en) * | 2019-10-30 | 2020-03-17 | 鞍钢股份有限公司 | High-strength and high-toughness steel rail for crane and manufacturing method thereof |
| CN111471929A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for quality-adjustment-free gear and production method thereof |
| CN111471934A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN111471938A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for electric automobile gear and production method thereof |
| CN111471938B (en) * | 2020-05-25 | 2021-06-04 | 武汉钢铁有限公司 | Carbide bainite-free steel for electric automobile gear and production method thereof |
| CN111471929B (en) * | 2020-05-25 | 2021-08-13 | 武汉钢铁有限公司 | Carbide bainite-free steel for quality-adjustment-free gear and production method thereof |
| CN111471934B (en) * | 2020-05-25 | 2021-08-13 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN114058945A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | High-strength bainite wear-resistant steel plate and production method thereof |
| CN114850365A (en) * | 2022-04-19 | 2022-08-05 | 中国恩菲工程技术有限公司 | Bainite-based grinding medium and preparation method and application thereof |
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