CN103205636A - Low-carbon bainite continuous yield band steel and production method thereof - Google Patents
Low-carbon bainite continuous yield band steel and production method thereof Download PDFInfo
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- CN103205636A CN103205636A CN2013101351903A CN201310135190A CN103205636A CN 103205636 A CN103205636 A CN 103205636A CN 2013101351903 A CN2013101351903 A CN 2013101351903A CN 201310135190 A CN201310135190 A CN 201310135190A CN 103205636 A CN103205636 A CN 103205636A
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Abstract
The invention discloses a low-carbon bainite continuous yield band steel which comprises the following chemical components in percentage by weight: 0.06-0.09% of C, 0.15-0.30% of Si, 1.4-1.6% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.020-0.060% of Alt and the balance of Fe and inevitable impurities. The invention also discloses a method for producing the low-carbon bainite continuous yield band steel. The low-carbon bainite continuous yield band steel disclosed by the invention has the characteristics of continuous yield of a tensile curve without an obvious yield point, achieves the tensile strength of 600-750 MPa, does not contain the expensive elements, such as Mo, V and the like in a material and is lower in alloy content compared with the traditional steel with the same strength.
Description
Technical field
The present invention relates to a kind of band steel production technology, specifically, relate to the continuous yield band steel of a kind of low-carbon bainite and production method thereof.
Background technology
The automobile high-strength sheet steel is to serve as the Hi-Stren steel of basis adding Mo, Nb, microalloy elements such as V, Ti with the C-Mn steel.Along with the light-weighted development of automobile, 600MPa higher level high-strength steel increases gradually at the consumption of body of a motor car.In novel passenger car and heavy-load automobile, bottom girder, crossbeam and strong beam thereof progressively are promoted to 600MPa with the intensity of steel from 510MPa, even more than the 700MPa.Present domestic tensile strength adopts Mo-V-Nb or Mo-Nb-Ti alloying to produce greater than the automobile sheet steel more than the 600MPa level more, generally contains the expensive significantly increase of Mo, V element and alloying element content of high price.The present mode of production, its coiling temperature of the rolling back of coil of strip is that high temperature batches, mainly by refined crystalline strengthening and precipitation strength, generally there is yield-point in schedule of reinforcement.
Summary of the invention
Technical problem solved by the invention provides the continuous yield band steel of a kind of low-carbon bainite, it is characterized by stress strain curve for surrender continuously, does not have tangible yield-point.
Technical scheme is as follows:
The continuous yield band steel of a kind of low-carbon bainite, its chemical ingredients is by weight percentage: C0.06-0.09%, Si0.15-0.30%, Mn1.4-1.6%, P≤0.020%, S≤0.010%, Alt0.020-0.060%, surplus is Fe and unavoidable impurities.
Further, also comprise Nb and Ti, its chemical ingredients is Nb+Ti≤0.13% by weight percentage.
Further, chemical ingredients by weight percentage, Nb is 0.020-0.050%, Ti is 0.040-0.080%.
Further, its chemical ingredients by weight percentage, C content is that 0.09, Si content is that 0.25, Mn content is that 1.56, P content is that 0.011, S content is that 0.006, Alt content is that 0.038, Nb content is 0.04, Ti content is 0.05.
Further, its chemical ingredients by weight percentage, C content is that 0.07, Si content is that 0.30, Mn content is that 1.50, P content is that 0.015, S content is that 0.008, Alt content is that 0.036, Nb content is 0.03, Ti content is 0.03.
Another technical problem solved by the invention provides the production method of the continuous yield band steel of a kind of low-carbon bainite, and the material characteristics of production is that stress strain curve is continuous surrender, does not have tangible yield-point.
Technical scheme is as follows:
The production method of the continuous yield band steel of a kind of low-carbon bainite, comprise smelting and add casting process and the rolling process of cooling that adds, the band steel chemical composition that production obtains is by weight percentage: C0.06-0.09%, Si0.15-0.30%, Mn1.4-1.6%, P≤0.020%, S≤0.010%, Alt0.020-0.060%, surplus is Fe and unavoidable impurities.
Further, also comprise Nb and Ti in the material, its chemical ingredients is Nb+Ti≤0.13% by weight percentage.
Further, chemical ingredients by weight percentage, Nb is 0.020-0.050%, Ti is 0.040-0.080%.
Further, described smelting process adopts the full guard pouring technology; Ladle adopts long nozzle hydrogenation envelope to the tundish protection, utilizes seal washer and hydrogen to seal to prevent that air from infiltrating; The tundish of casting process adopts the connection hydrogenation envelope of submerged nozzle to the beam protection of crystallizer, and controls P≤0.020%, S≤0.010%, [O]≤40ppm, [the N]≤60ppm of strand.
Further, the described operation of rolling adopts the CSP mode to produce, rolling employing seven frame tandem rolling mode of manufacture, and preceding twice rolling draft 〉=40%, finishing temperature is controlled at 820～860 ℃; The strong cold two-part type of cooling in front end laminar flow cooling+rear portion is adopted in cooling, and the laminar flow speed of cooling is controlled at 10-20 ℃/S, and strong cold speed of cooling control is at least 80 ℃/S, and coiling temperature is controlled in 150-350 ℃ of scope.
The technology of the present invention effect comprises:
1, among the present invention, the stress strain curve that is characterized as of the continuous yield band steel of low-carbon bainite is surrendered for continuous, does not have tangible yield-point.
2, among the present invention, the tensile strength of the continuous yield band steel of low-carbon bainite is 600～750MPa, and does not contain expensive elements such as Mo, V in the material, and is lower than equality strength conventional steel iron alloy content.
3, among the present invention, production cost is low, adopts the control cooling technology, realizes the transformation of tissue and the lifting of intensity, can stably produce the low-cost hot rolled strip of continuous surrender, and the thickness specification is 3.5-8.0mm, and tensile strength can reach 600MPa-750MPa.
Description of drawings
Fig. 1 is the metallograph of the continuous yield band steel of low-carbon bainite among the present invention.
Embodiment
The step of producing the continuous yield band steel of 600～750MPa low-carbon bainite comprises smelting+continuous casting and rolling+two processes of cooling, and is specific as follows:
Step 1: smelting+continuous casting
Smelt and adopt the full guard pouring technology, namely ladle adopts long nozzle hydrogenation envelope to the tundish protection, utilizes seal washer and hydrogen to seal to prevent that air from infiltrating; The tundish of casting process adopts the SEN(submerged nozzle to the protection of the beam of crystallizer) connection hydrogenation envelope, P≤0.020%, S≤0.010%, [O]≤40ppm, [the N]≤60ppm of control strand.
Casting process adopts the technology of dynamically gently depressing, effectively control center's segregation and center porosity.
Step 2: rolling+cooling
Adopt the CSP mode to produce rolling employing seven frame tandem rolling mode of manufacture, rolling employing 7 passage tandem rollings.Preceding twice rolling draft 〉=40%, finishing temperature is controlled at 820～860 ℃.
The strong cold two-part type of cooling in front end laminar flow cooling+rear portion is adopted in cooling after the operation of rolling, and the laminar flow speed of cooling is controlled at 10-20 ℃/S, by force cold but speed control 80 ℃/more than the S, coiling temperature is controlled in 150-350 ℃ of scope.
Behind said process, obtaining tensile strength is the continuous yield band steel of low-carbon bainite of 600～750MPa, its chemical ingredients is by weight percentage: C0.06-0.09%, Si0.15-0.30%, Mn1.4-1.6%, P≤0.020%, S≤0.010%, Alt0.020-0.060%, surplus is Fe and unavoidable impurities.
In order further to strengthen the property, compound interpolation Nb, Ti microalloy element on above-mentioned C-Mn base steel plinth, Nb+Ti≤0.13%, preferred chemical ingredients is by weight percentage: Nb0.020-0.050%, Ti0.040-0.080%.
As shown in Figure 1, be the metallograph of the continuous yield band steel of low-carbon bainite among the present invention.
This low-carbon bainite steel be organized as bainite+a little ferrite and carbonization precipitate, fully utilized two kinds of means of phase transformation strengthening and precipitation strength.Reduce cooling intensity or in the design alloys range, increase Nb, Ti composition, can increase yield strength, to regulate yield tensile ratio, to adapt to the needs of different machining deformation equipment.
Below in conjunction with actual production process technical solution of the present invention is described further.
Adopt desulfurizing iron, 210t converter smelting, the refining of LF stove at steelworks, slab thickness is 57～72mm, be that 57～72mm, length are that the slab of 980～1560mm is delivered to process furnace and hot continuous rolling unit with thickness, behind 7 frame hot continuous rollings, adopt the hot continuous rolling mode of production production of controlled rolling and controlled cooling to obtain the continuous yield band steel of low-carbon bainite that tensile strength is 600～750MPa.
Embodiment 1
Adopt desulfurizing iron, 210t converter smelting, the refining of LF stove at steelworks, make the chemical ingredients in the steel as shown in table 1 after the processing, surplus is Fe and inevitably is mingled with.
Table 1 chemical ingredients wt%(weight percent)
The continuous casting of molten steel base section thickness that requires is 57mm, be that the slab of 1200mm is delivered to process furnace with section thickness 57mm, width, Heating temperature is 1150 ℃, it is rolling that slab after the heating is sent into the hot continuous rolling unit, preceding two draft 〉=40% of hot continuous rolling unit, 15 ℃/s of laminar flow cooling, fast cold 80 ℃/s, 330 ℃ of coiling temperatures, finished product thickness 5.0mm.
After testing, the performance of the continuous yield band steel of low-carbon bainite: tensile strength 710MPa, yield strength 480MPa, unit elongation A50 are 26%.
Embodiment 2
Through desulfurizing iron, 210t converter smelting, the refining of LF stove, make the chemical ingredients in the steel as shown in table 2 after the processing, surplus is Fe and inevitably is mingled with.
Table 2 chemical ingredients wt%(weight percent)
Thickness of strand 70mm, thickness is that 70mm, width are that the slab of 1350mm is sent into process furnace, 1120 ℃ of furnace temps, slab after the heating is sent into the hot continuous rolling unit, preceding two draft 〉=40% of hot continuous rolling unit, 16 ℃/s of stream cooling, fast cold 85 ℃/s, 300 ℃ of coiling temperatures, finished product thickness 6.0mm.
After testing, the performance of the continuous yield band steel of low-carbon bainite: tensile strength 640MPa, yield strength 460MPa, unit elongation A50 are 28%.
Claims (10)
1. continuous yield band steel of low-carbon bainite, it is characterized in that, its chemical ingredients is by weight percentage: C0.06-0.09%, Si0.15-0.30%, Mn1.4-1.6%, P≤0.020%, S≤0.010%, Alt0.020-0.060%, surplus is Fe and unavoidable impurities.
2. the continuous yield band steel of low-carbon bainite as claimed in claim 1 is characterized in that, also comprises Nb and Ti, and its chemical ingredients is Nb+Ti≤0.13% by weight percentage.
3. the continuous yield band steel of low-carbon bainite as claimed in claim 2 is characterized in that, chemical ingredients by weight percentage, Nb is 0.020-0.050%, Ti is 0.040-0.080%.
4. the continuous yield band steel of low-carbon bainite as claimed in claim 3, it is characterized in that, its chemical ingredients by weight percentage, C content is that 0.09, Si content is that 0.25, Mn content is 1.56, P content is 0.011, S content is that 0.006, Alt content is that 0.038, Nb content is 0.04, Ti content is 0.05.
5. the continuous yield band steel of low-carbon bainite as claimed in claim 3, it is characterized in that, its chemical ingredients by weight percentage, C content is that 0.07, Si content is that 0.30, Mn content is 1.50, P content is 0.015, S content is that 0.008, Alt content is that 0.036, Nb content is 0.03, Ti content is 0.03.
6. the production method of the continuous yield band steel of low-carbon bainite, it is characterized in that, comprise smelting and add casting process and the rolling process of cooling that adds, the band steel chemical composition that production obtains is by weight percentage: C0.06-0.09%, Si0.15-0.30%, Mn1.4-1.6%, P≤0.020%, S≤0.010%, Alt0.020-0.060%, surplus is Fe and unavoidable impurities.
7. the production method of the continuous yield band steel of low-carbon bainite as claimed in claim 6 is characterized in that, also comprises Nb and Ti in the material, and its chemical ingredients is Nb+Ti≤0.13% by weight percentage.
8. the production method of the continuous yield band steel of low-carbon bainite as claimed in claim 7 is characterized in that, chemical ingredients by weight percentage, Nb is 0.020-0.050%, Ti is 0.040-0.080%.
9. the production method of the continuous yield band steel of low-carbon bainite as claimed in claim 6 is characterized in that, described smelting process adopts the full guard pouring technology; Ladle adopts long nozzle hydrogenation envelope to the tundish protection, utilizes seal washer and hydrogen to seal to prevent that air from infiltrating; The tundish of casting process adopts the connection hydrogenation envelope of submerged nozzle to the beam protection of crystallizer, and controls P≤0.020%, S≤0.010%, [O]≤40ppm, [the N]≤60ppm of strand.
10. the production method of the continuous yield band steel of low-carbon bainite as claimed in claim 6, it is characterized in that the described operation of rolling adopts the CSP mode to produce rolling employing seven frame tandem rolling mode of manufacture, preceding twice rolling draft 〉=40%, finishing temperature is controlled at 820～860 ℃; The strong cold two-part type of cooling in front end laminar flow cooling+rear portion is adopted in cooling, and the laminar flow speed of cooling is controlled at 10-20 ℃/S, and strong cold speed of cooling control is at least 80 ℃/S, and coiling temperature is controlled in 150-350 ℃ of scope.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030217795A1 (en) * | 2002-04-09 | 2003-11-27 | Hitoshi Asahi | High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same |
| JP4547044B2 (en) * | 2008-07-30 | 2010-09-22 | 新日本製鐵株式会社 | High-strength thick steel material excellent in toughness and weldability, high-strength extra-thick H-shaped steel, and methods for producing them |
| JP2010533791A (en) * | 2007-07-19 | 2010-10-28 | アルセロールミタル・フランス | Method for producing a steel sheet having high resistance characteristics and ductility characteristics and the steel sheet thus obtained |
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- 2013-04-18 CN CN201310135190.3A patent/CN103205636B/en not_active Withdrawn - After Issue
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030217795A1 (en) * | 2002-04-09 | 2003-11-27 | Hitoshi Asahi | High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same |
| JP2010533791A (en) * | 2007-07-19 | 2010-10-28 | アルセロールミタル・フランス | Method for producing a steel sheet having high resistance characteristics and ductility characteristics and the steel sheet thus obtained |
| JP4547044B2 (en) * | 2008-07-30 | 2010-09-22 | 新日本製鐵株式会社 | High-strength thick steel material excellent in toughness and weldability, high-strength extra-thick H-shaped steel, and methods for producing them |
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