CN102080191B - Niobium-boron composite hot rolled high-strength container steel plate and preparation method thereof - Google Patents
Niobium-boron composite hot rolled high-strength container steel plate and preparation method thereof Download PDFInfo
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- CN102080191B CN102080191B CN2010105788179A CN201010578817A CN102080191B CN 102080191 B CN102080191 B CN 102080191B CN 2010105788179 A CN2010105788179 A CN 2010105788179A CN 201010578817 A CN201010578817 A CN 201010578817A CN 102080191 B CN102080191 B CN 102080191B
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Abstract
The invention discloses a niobium-boron composite hot rolled high-strength container steel plate and a preparation method thereof. The container steel plate comprises the following chemical components in percentage by weight: 0.04 to 0.05 percent of C, 0.20 to 0.30 percent of Si, 1.80 to 2.0 percent of Mn, less than 0.0092 percent of P, less than 0.0028 percent of S, less than 0.004 percent of N, 0.04 to 0.05 percent of Nb, less than 0.002 percent of B, 0.2 to 0.4 percent of Ni, 0.3 to 0.5 percent of Cr, 0.3 to 0.5 percent of Cu, 0.01 to 0.03 percent of Ti, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps of: melting low-carbon steel, manufacturing a plate blank, heating the plate blank to the temperature of 1,250 DEG C, preserving the heat for 1 to 2 hours, performing hot rolling at the temperature of between 1,050 and 1,100 DEG C, and performing final rolling at the temperature of between 780 and 830 DEG C, wherein the thickness of the rolled thin plate is less than 2.0 millimeters; and performing laminar cooling at the cooling rate of 20 to 30 DEG C per second to the coiling temperature of between 500 and 510 DEG C, and preserving the heat to obtain the container plate with thin specification (less than 2.0 millimeters) and high strength (more than 700MPa). The method has the advantages that: the cost is low, bainite steel is obtained in a wide cooling rate range, the process is simple and operability is strong, the energy consumption is reduced, transportation expense is reduced, and the method is environmentally-friendly.
Description
Technical field
The invention belongs to the technical field of freight container, be specifically related to tensile strength greater than 700MPa niobium-boron complex intensifying hot-rolled high-strength container plate its preparation method with steel.
Background technology
Nowadays, along with the sharp increase of international trade, the shared status of encased conveying is more and more important.Yet container steel plate must have stronger corrosion resistance nature, high intensity, good forming property.Nowadays the container steel plate tensile strength of domestic a lot of enterprise production majority is greater than 490MPa, and the container plate ratio of thin intensity with a high standard is on the low side and plate shape is difficult to guarantee (especially planeness), need be from external a large amount of imports.If replace this low intensive steel plate with thin intensity steel plate with a high standard, not only can cut down the consumption of energy, trucking costs, cost, raising factory benefit, can also bring enormous benefits to environment.Therefore, (＜freight container 2.0mm) will become the inexorable trend of development to the thin specification of HS (greater than 700MPa).
Niobium boron complex intensifying hot-rolled high-strength container plate is made up of granular bainite+a small amount of ferrite bainite, has high intensity, characteristics such as good welding and forming property.At present, the standard of GB/T4171-2000 and Nippon Standard JISG3125-1987 is adopted in the production of domestic container plate more, and is the most common with the SPA-H of Japan, is organized as ferritic and perlite, and intensity is lower.And niobium boron clad steel plate is organized as granular bainite, because of bainite has high intensity and toughness, makes this steel have the excellent comprehensive performance.Also added trace elements such as Nb, Ti, B, played phase transformation strengthening, refined crystalline strengthening, precipitation strength effect, improved intensity greatly, low carbon content has guaranteed good welding property simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of thin specification (＜2.0mm) HS (greater than 700MPa) container plate and method of manufacture; Adopt the container plate of this method significantly to improve intensity, improve welding property, forming property, reduce cost, reduce trucking costs, cut down the consumption of energy, therefore can improve environmental benefit.
For reaching above purpose, technical scheme of the present invention is that a kind of niobium-boron complex intensifying hot-rolled high-strength container plate is characterized in that the composition of this container plate is by weight percentage: C:0.03%～0.06%; Si:0.10～0.30%; Mn:1.50～2.0%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.03～0.06%; B:＜0.002%; Ni:0.1～0.4%; Cr:0.3～0.5%; Cu:0.3～0.5%; Ti:0.01～0.03%, surplus are Fe and unavoidable impurities.
Further, the composition of said container plate is by weight percentage: C:0.04%～0.05%; Si:0.20～0.30%; Mn:1.80～2.0%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.04～0.05%; B:＜0.002%; Ni:0.2～0.4%; Cr:0.35～0.45%; Cu:0.35～0.45%; Ti:0.02～0.03%, surplus are Fe and unavoidable impurities.
Another object of the present invention provides the preparation method of above-mentioned niobium-boron complex intensifying hot-rolled high-strength container plate, specifically may further comprise the steps:
1. smelting low carbon steel: according to weight percent is C:0.03%～0.06%; Si:0.10～0.30%; Mn:1.50～2.0%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.03～0.06%; B:＜0.002%; Ni:0.1～0.4%; Cr:0.35～0.45%; Cu:0.35～0.45%; Ti:0.01～0.03%, surplus are Fe and unavoidable impurities;
2. the steel billet with above-mentioned steps system is heated to 1250～1300 ℃, is incubated 1～2 hour;
3., scale breaker gets into hot rolls after removing the scale on surface of said steel billet; Start rolling temperature is 1050～1100 ℃, and finishing temperature is 780～880 ℃, and rolling V-bar is 4m/s; Sheet gauge after rolling is less than 2.0mm; Carry out laminar flow cooling with the cooling rate of 10～30 ℃/s then, be cooled to temperature and be 500～550 ℃ and batch, obtain niobium-boron complex intensifying hot-rolled high-strength container plate.
Further, the hot rolled start rolling temperature in the said step 3 is 1080～1100 ℃, and 780～830 ℃ of finishing temperatures are rolled the back sheet gauge less than 2.0mm, carry out laminar flow cooling, 500～510 ℃ of coiling temperatures with the cooling rate of 20～30 ℃/s.
Further, the tensile strength of said preparation niobium-boron complex intensifying hot-rolled high-strength container plate is greater than 700MPa, and ys is greater than 500MPa, and unit elongation is more than 15.0%, and yield tensile ratio is 0.65～0.76.Innovative point of the present invention and advantage:
Add the Nb (0.04～0.05%) of trace and the B of minute quantity in 1 steel, niobium has drageffect, can postpone austenitic recrystallization process, and is meaningful to the rolling ten minutes of non-recrystallize; Boron is enriched in crystal boundary with solid solution condition and reduces crystal boundary energy, can postpone ferritic transformation significantly, can play the effect of phase transformation strengthening, refined crystalline strengthening, precipitation strength like this, can improve intensity, also can improve plasticity and toughness.Simultaneously, low carbon content can guarantee good welding property.
What 2 these steel grades obtained is bainite structure, rather than traditional ferritic and pearlitic structure, can improve intensity and plasticity and toughness greatly, obtains excellent comprehensive mechanical properties.And cooling rate is can both obtain this tissue between 5 ℃/s～30 ℃/s, can in the cooling rate scope of broad, obtain bainitic steel.In addition, this steel grade adds the B of minute quantity, rather than Mo, can reduce the cost of steel grade like this.
Description of drawings
Accompanying drawing 1 prepares the hot rolling technology schematic flow sheet of the thin specification container plate hot rolling slab of HS for the present invention.
Accompanying drawing 2 is the metallographic structure synoptic diagram of sample after the hot rolling of the present invention.
Accompanying drawing 3 is the stress strain curve synoptic diagram of sample of the present invention.
Accompanying drawing 4 is the light field synoptic diagram of the TEM of the ferrite bainite ferritic structure of slab after the hot rolling of the present invention.
Accompanying drawing 5 is the light field synoptic diagram of the TEM of the M-A island tissue of slab after the hot rolling of the present invention.
Accompanying drawing 6 is the fine structure TEM light field synoptic diagram of the inner twin crystal martensite in slab M-A island after the hot rolling of the present invention.
Embodiment:
Embodiment 1
Smelting low carbon steel, its chemical ingredients are C:0.045% by weight percentage; Si:0.26%; Mn:1.94%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.045%; B:0.012%; Ni:0.26%; Cr:0.40%; Cu:0.40%; Ti:0.022%, surplus is Fe; Slab is placed in the high temperature resistance furnace, be heated to 1250 ℃ of insulations 1 hour, through getting into hot rolls, 1100 ℃ of open rollings, the several passages of continuous rolling behind the scale breaker removal scale on surface with 10 ℃/s; Treat that temperature reduces to 950 ℃ of rolling more several passages; The control finishing temperature is 780 ℃, and rolling V-bar is 4m/s, and the accumulative total draught is 92～95%; Sheet gauge after rolling is below the 2.0mm; Finish to gauge finishes the back with 10 ℃/s, 20 ℃/s, 30 ℃/s cooling, is chilled to about 500 ℃, again with sample put into holding furnace (500 ℃) insulation after 1 hour with air cooling to room temperature.
Fig. 2 is a metallographic structure pattern after niobium-boron composite high-strength container plate hot rolling, and wherein 780 ℃ of (a) finishing temperatures, cooling rate are 10 ℃/s; (b) be 30 ℃/s of cooling rate.
Fig. 3 is the stress-strain curve when sample stretches after niobium-boron composite high-strength container plate hot rolling.The mechanical property of embodiment 1 niobium-boron composite high-strength container plate
Embodiment 2
Smelting low carbon steel, its chemical ingredients are C:0.045% by weight percentage; Si:0.26%; Mn:1.94%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.045%; B:0.012%; Ni:0.26%; Cr:0.40%; Cu:0.40%; Ti:0.022%, surplus is Fe; Slab is placed in the high temperature resistance furnace, be heated to 1250 ℃ of insulations 1.5 hours, through getting into hot rolls, 1100 ℃ of open rollings, the several passages of continuous rolling behind the scale breaker removal scale on surface with 10 ℃/s; Treat that temperature reduces to 950 ℃ of rolling more several passages; The control finishing temperature is 830 ℃, and rolling V-bar is 4m/s, and the accumulative total draught is 92～95%; Sheet gauge after rolling is below the 2.0mm; Finish to gauge finishes the back with 10 ℃/s, 20 ℃/s, 30 ℃/s cooling, is chilled to about 500 ℃, again with sample put into holding furnace (500 ℃) insulation after 1 hour with air cooling to room temperature.
Like Fig. 2 is metallographic structure pattern, wherein 830 ℃ of (c) finishing temperatures, 10 ℃/s of cooling rate after niobium-boron composite high-strength container plate hot rolling; (d) be 30 ℃/s of cooling rate.
The mechanical property of embodiment 2 niobium boron composite high-strength container plates
Embodiment 3
Smelting low carbon steel, its chemical ingredients are C:0.045% by weight percentage; Si:0.26%; Mn:1.94%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.045%; B:0.012%; Ni:0.26%; Cr:0.40%; Cu:0.40%; Ti:0.022%, surplus is Fe; Slab is placed in the high temperature resistance furnace, be heated to 1250 ℃ of insulations 2 hours, through getting into hot rolls, 1100 ℃ of open rollings, the several passages of continuous rolling behind the scale breaker removal scale on surface with 10 ℃/s; Treat that temperature reduces to 950 ℃ of rolling more several passages; The control finishing temperature is 880 ℃, and rolling V-bar is 4m/s, and the accumulative total draught is 92～95%; Sheet gauge after rolling is below the 2.0mm; Finish to gauge finishes the back with 10 ℃/s, 20 ℃/s, 30 ℃/s cooling, is chilled to about 500 ℃, again with sample put into holding furnace (500 ℃) insulation after 1 hour with air cooling to room temperature.
The mechanical property of embodiment 3 niobiums-boron composite high-strength container plate
Claims (1)
1. the preparation method of the compound hot-rolled high-strength container steel plate of niobium boron is characterized in that:
(1) smelting low carbon steel is C:0.04%～0.045% according to weight percent; Si:0.20～0.30%; Mn:1.80～2.0%; P:＜0.0092%; S:＜0.0028%; N:＜0.004%; Nb:0.04～0.05%; B:＜0.002%; Ni:0.2～0.4%; Cr:0.35～0.45%; Cu:0.35～0.45%; Ti:0.01～0.022%, surplus are Fe and unavoidable impurities;
(2) steel billet with above-mentioned steps system is heated to 1250～1300 ℃, is incubated 1～2 hour;
(3) get into hot rolls after the process scale breaker is removed said billet surface iron scale; The hot rolled start rolling temperature is 1080～1100 ℃, 780～830 ℃ of finishing temperatures, and rolling V-bar is 4m/s; Sheet gauge after rolling is less than 2.0mm; Carry out laminar flow cooling with the cooling rate of 20～30 ℃/s then, be cooled to temperature to 500～510 and ℃ batch, obtain niobium-boron complex intensifying hot-rolled high-strength container steel plate.
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| CN2010105788179A CN102080191B (en) | 2010-12-03 | 2010-12-03 | Niobium-boron composite hot rolled high-strength container steel plate and preparation method thereof |
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| CN2010105788179A CN102080191B (en) | 2010-12-03 | 2010-12-03 | Niobium-boron composite hot rolled high-strength container steel plate and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382619A (en) * | 2001-04-20 | 2002-12-04 | 广州珠江钢铁有限责任公司 | Technology for manufacturing plates for container |
| CN1639371A (en) * | 2002-02-27 | 2005-07-13 | 新日本制铁株式会社 | Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof |
| CN1757782A (en) * | 2005-11-04 | 2006-04-12 | 东北大学 | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel |
| CN101235469A (en) * | 2008-02-28 | 2008-08-06 | 武汉钢铁(集团)公司 | High-strength easy-formation atmospheric corrosion resisting steel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382619A (en) * | 2001-04-20 | 2002-12-04 | 广州珠江钢铁有限责任公司 | Technology for manufacturing plates for container |
| CN1639371A (en) * | 2002-02-27 | 2005-07-13 | 新日本制铁株式会社 | Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof |
| CN1757782A (en) * | 2005-11-04 | 2006-04-12 | 东北大学 | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel |
| CN101235469A (en) * | 2008-02-28 | 2008-08-06 | 武汉钢铁(集团)公司 | High-strength easy-formation atmospheric corrosion resisting steel |
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