CN103614624A - High-density precipitated phase containing low-alloy high-strength steel plate strip and rolling process thereof - Google Patents
High-density precipitated phase containing low-alloy high-strength steel plate strip and rolling process thereof Download PDFInfo
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- CN103614624A CN103614624A CN201310624648.1A CN201310624648A CN103614624A CN 103614624 A CN103614624 A CN 103614624A CN 201310624648 A CN201310624648 A CN 201310624648A CN 103614624 A CN103614624 A CN 103614624A
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Abstract
The invention discloses a high-density precipitated phase containing low-alloy high-strength steel plate strip and a rolling process thereof. The high-density precipitated phase containing low-alloy high-strength steel plate strip comprises the following chemical compositions in percentage by weight: 0.05-0.12% of C, less than or equal to 0.50% of Si, 1.20-2.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, greater than or equal to 0.030% of Alt, 0.060-0.080% of Nb, 0.051-0.070% of V, 0.11-0.15% of Ti, 0.24-0.44% of Mo, greater than 0.23% of Nb+V+Ti, and the balance of Fe and unavoidable impurities. A hot rolling process is implemented as follows: the heating temperature of a steel ingot is 1190-1260 DEG C, the heat preservation time is 1-5 hours, the rough rolling time is 1150-1200 DEG C, the finish rolling temperature is 950-990 DEG C, the final rolling temperature is 850-900 DEG C, the total rolling reduction of two-section rolling is greater than or equal to 80%, and the temperature waiting thickness of a plate blank is not less than 12 mm. The average online cooling rate is greater than 30 DEG C/s, and the thickness of a finished product plate is 4-10 mm. A steel plate treated by using the process has excellent mechanical properties, the tensile strength is greater than 820 MPa, the yield strength is greater than 720 MPa, and the elongation percentage is greater than 10%. The Charp impact value (size of a V-shaped notch specimen: 5mm*10mm*55 mm) is not less than 40J at room temperature, and not less than 20J at a temperature of minus 40 DEG C.
Description
Technical field
The invention belongs to field of iron and steel, relate to a kind of containing high-density precipitated phase low-alloy high-strength steel plate band and rolling technology thereof.
Background technology
At present, low-alloy high-strength steel plate band is to strengthen by tiny polygonal ferrite+a small amount of bainite mostly.Precipitated phase comparatively small amt, distributes comparatively local.Such as, people such as Zhou Qianxue are usingd the tiny precipitated phase ε-Cu that is of a size of the larger precipitated phase (Nb, Ti) (C, N) of 40～100nm and is of a size of 5～30nm and have been prepared Ultra-low carbon high-strength weathering steel as main strengthening phase.Yet adding of copper certainly will cause copper enrichment on furnace wall, increased smelting prepurging process cost.In fact, by adding the Nb of high-content, Ti element is relative less with the low-alloy high-strength steel plate band illustration that C element forms Compound Phase strengthening, this patent discloses a kind of containing high-density (Nb, Ti) C precipitated phase low-alloy high-strength steel plate band, mainly obtains high-strength high-plasticity strip of steel plate by strengthened nano precipitated phase.Fully utilized Nb, the advantage of Ti element, has obtained a kind of tensile strength and has contained above high-density (Nb, Ti) C precipitated phase low-alloy high-strength steel plate band and rolling technology up to 800MPa.
Summary of the invention
The object of this invention is to provide a kind of containing high-density precipitated phase low-alloy high-strength steel plate band and rolling technology thereof.
Realize technical scheme of the present invention as described below, steel billet chemical composition is: C0.05%-0.12%, Si≤0.50%, Mn1.20%-2.00%, P≤0.020%, S≤0.010%, Alt >=0.030%, Nb0.060%-0.080%, V0.051%-0.070%, Ti0.11%-0.15%, Mo0.24%-0.44%, surplus is Fe and inevitable impurity, and wherein Nb+V+Ti > 0.23%.By containing the as above steel billet of chemical composition, put into process furnace, Heating temperature 1190-1260 ℃, soaking time 1-5 hour.Roughing temperature 1150-1200 ℃, final rolling temperature 950-990 ℃, finishing temperature 850-900 ℃, two sections of rolling total reduction >=80%, steel billet treats that temperature thickness is not less than 12mm.Online average rate of cooling is greater than 30 ℃/s.Strip excellent performance, its tensile strength is greater than 820MPa, and yield strength is greater than 710MPa, and unit elongation is greater than 10%.(the v-notch specimen size: 5mm * 10mm * 55mm) be not less than 40J, be not less than 20J under-40 ℃ of conditions of Charpy impact value under normal temperature condition.
Outstanding advantages of the present invention is in strip, to be rich in high-density (Nb, Ti) C precipitated phase, and main strengthening phase is a large amount of (Nb, Ti) C and a small amount of bainite, is suitable for producing width 800-2000mm, thickness 3-10mm, and length is not more than the strip of steel plate of 12m.
Accompanying drawing explanation
Fig. 1 is microtexture photo under transmission electron microscope STEM pattern.
Embodiment
Below in conjunction with embodiment, the present invention is explained in detail.
Embodiment 1
The chemical composition of steel plate and content (weight percent) are: C0.079%, Si0.329%, Mn2.00%, P0.015%, S0.004%, Alt0.044%, Nb0.060%, V0.062%, Ti0.13%, Mo0.25%, surplus is Fe and inevitable impurity.
Its rolling technology system is: 1250 ℃ of billet heating temperature, soaking time 2.5 hours, 1200 ℃ of roughing temperature, 970 ℃ of final rolling temperatures, 880 ℃ of finishing temperatures, two sections of rolling total reduction >=80%, slab treats that temperature thickness is not less than 12mm, average 40 ℃/s of on-line cooling speed.Sampling detects, and its mechanical property danger measured value is in Table 1:
Table 1 mechanical property detected value
Microtexture photo as shown in Figure 1.As seen from the figure, in tissue, there is a large amount of high-density (Nb, Ti) C precipitated phases.
Claims (6)
1. one kind contains high-density precipitated phase low-alloy high-strength steel plate band, it is characterized in that its chemical composition and content are by weight percentage: C0.05%-0.12%, Si≤0.50%, Mn1.20%-2.00%, P≤0.020%, S≤0.010%, Alt >=0.030%, Nb0.060%-0.080%, V0.051%-0.070%, Ti0.11%-0.15%, Mo0.24%-0.44%, surplus is Fe and inevitable impurity.
2. as claimed in claim 1 a kind of containing high-density precipitated phase low-alloy high-strength steel plate band, it is characterized in that Nb+V+Ti > 0.23%.
3. as claimed in claim 1 a kind of containing high-density precipitated phase low-alloy high-strength steel plate band, it is characterized in that its tensile strength is greater than 820MPa, yield strength is greater than 710MPa, unit elongation is greater than 10%, under normal temperature condition, v-notch half-size scale sample Charpy impact value is not less than 40J, under-40 ℃ of conditions, is not less than 20J.
4. as claimed in claim 1 a kind of containing high-density precipitated phase low-alloy high-strength steel plate band, it is characterized in that main precipitation strength is a large amount of precipitated phases and a small amount of bainite mutually.
5. a kind of high-density precipitated phase low-alloy high-strength steel plate band that contains as claimed in claim 1, is characterized in that width 800-2000mm, thickness 3-10mm, and length is not more than 12m.
6. a kind of rolling technology containing high-density precipitated phase low-alloy high-strength steel plate band of feature as claimed in claim 1, the Heating temperature 1190-1260 ℃ that it is characterized in that steel ingot, soaking time 1-5 hour, roughing temperature 1150-1200 ℃, final rolling temperature 950-990 ℃, finishing temperature 850-900 ℃, two sections of rolling total reduction >=80%, slab treats that temperature thickness is not less than 12mm, and average on-line cooling speed is greater than 30 ℃/s.
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| CN201310624648.1A CN103614624B (en) | 2013-11-27 | 2013-11-27 | One kind low-alloy high-strength steel plate band of precipitated phase containing high density and rolling mill practice |
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| CN201310624648.1A CN103614624B (en) | 2013-11-27 | 2013-11-27 | One kind low-alloy high-strength steel plate band of precipitated phase containing high density and rolling mill practice |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846279A (en) * | 2015-05-08 | 2015-08-19 | 内蒙古包钢钢联股份有限公司 | Medium alloy oil well pipe and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109023091B (en) * | 2018-09-10 | 2019-11-01 | 武汉科技大学 | A kind of good hot rolling ultra-high strength steel plate of processability and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103014539A (en) * | 2011-09-26 | 2013-04-03 | 宝山钢铁股份有限公司 | High-strength and high-toughness steel plate with 700 Mpa-level yield strength and preparation method of steel plate |
| CN103266269A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | HB500 grade hot continuous rolling high strength wear-resisting steel and production method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014539A (en) * | 2011-09-26 | 2013-04-03 | 宝山钢铁股份有限公司 | High-strength and high-toughness steel plate with 700 Mpa-level yield strength and preparation method of steel plate |
| CN103266269A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | HB500 grade hot continuous rolling high strength wear-resisting steel and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846279A (en) * | 2015-05-08 | 2015-08-19 | 内蒙古包钢钢联股份有限公司 | Medium alloy oil well pipe and preparation method thereof |
| CN104846279B (en) * | 2015-05-08 | 2017-01-25 | 内蒙古包钢钢联股份有限公司 | Medium alloy oil well pipe and preparation method thereof |
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