CN102424933A - Hot-rolled high-strength strip steel and manufacturing method thereof - Google Patents
Hot-rolled high-strength strip steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to hot-rolled high-strength strip steel and a manufacturing method thereof. The strip steel comprises the following components: 0.05-0.10% of C, 0-0.30% of Si, 1.0-1.80% of Mn, not more than 0.015% of P, not more than 0.008% of S, 0.01-0.07% of Nb, 0.01-0.12% of Ti, 0.01-0.05% of Al, not more than 0.0012% of O, not more than 0.0035% of N; the ReH is 580-670 MPa; the Rm is 690-750 MPa; A is 19-30%; -40 DEG C AKv is 50-180 J; and 180-degree d = 2a. The manufacturing method comprises the following steps of: I. converter smelting, wherein the molten steel is processed to contain not more than 0.010% of P and not more than 0.020% of S; II. LF refining, wherein the components are adjusted finely; steel tapping when the components of the molten steel meet the requirements; III. continuous casting, wherein whole-course argon blowing is performed to protect the casting; soft reduction technology is employed; the casting temperature is controlled at 1530-1560 DEG C; VI. hot continuous rolling, wherein the finishing temperature is 820-880 DEG C; a laminar flow cooling mode is employed; and a coiling temperature CT is 530-620 DEG C. The hot-rolled high-strength strip steel manufactured by the invention meets the requirements of steel for engineering machinery.
Description
Technical field
A kind of hot rolling high strength band steel and method of manufacture thereof specifically are a kind of 550MPa level hot rolling high strength band steel and method of manufacture thereof
Background technology
Existing 550MPa level hot rolling high strength band steel user thinks that intensity is on the low side, for this reason after using; Need develop the higher hot rolling high strength band steel of intensity; Develop a kind of ys ReH 550Mpa, tensile strength Rm is 670～830MPa, unit elongation A >=16%;-40 ℃ of ballistic work AKv >=27J, the HS of 180 ° of cold bending test d=2a, H.T. hot rolling band steel.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing 550MPa level hot rolling high strength band steel, the present invention provides a kind of hot rolling high strength band steel, this hot rolled strip ys ReH >=550MPa; Tensile strength Rm670～830MPa; Unit elongation A >=16% ,-40 ℃ of ballistic work AKv >=27J, 180 ° of cold bending test d=2a.The method of manufacture of this steel is provided simultaneously.
This hot rolling high strength band steel is because this product mechanical property characteristics are HS; High-ductility, H.T.; Good welding property requirement; So chemical composition design adopts the thinking of low-carbon (LC), middle manganese, an amount of niobium, titanium, low-carbon (LC) is in order to ensure high plasticity, high toughness, and an amount of niobium, titanium micro-alloyedization of good weldableness and processability is in order to improve the intensity of steel plate.
The quality per distribution ratio of the chemical ingredients of this hot rolled strip is following:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%, S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%, 0≤0.0012%, N≤0.0035%; All the other are Fe and unavoidable impurities.
The ys ReH of band steel is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a
The method of manufacture of this hot rolled strip comprises following sequential steps:
The I converter smelting
With the preprocessed molten iron of S≤0.003%, the steel scrap of S≤0.020% is poured 180 tons of top and bottom combined blown converters into, and pretreated weight of molten iron is than>=70%, taps to stop oxygen blast in preceding 2 minutes; Tapping P≤0.010%, tapping S≤0.020%, tapping temperature≤1690 ℃, tap hole is good; The tapping control quantity of slag is not more than 1.8 tons of tappings and adds lime and alloy at ladle earlier, bag BOTTOM ARGON BLOWING in the ladle of tapping back, thermometric;
II LF refining
The LF stove takes off S and finishes back (S content is 0～0.006%); Composition (all will be confirmed whether target approach composition requirement to carbon, manganese, silicon and the whole alloying elements of other alloy in the fine setting steel; Like the miss the mark requirement; Need add alloy and finely tune composition, the composition that goes out operation at LF is essentially the finished product composition); Ladle feeds the Si-Ca line 2.5～3.5m/t before going out the LF station, and the weak stirring of BOTTOM ARGON BLOWING is more than 5 minutes;
The mass percent of the composition of molten steel reaches following requirement tapping:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%; S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%; 0≤0.0012%, N≤0.0035%, all the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast; Teeming temperature is controlled at 1530～1560 ℃;
The VI hot continuous rolling
Slab heating temperature: 1150～1300 ℃, heat-up time is greater than 180min; Finishing temperature: 820～880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:530～620 ℃; Rolling specs: 4～16mm.
Service check
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, and 180 ° of cold bending test d=2a are qualified.
The method of manufacture of above-mentioned hot rolling high strength band steel is characterized in that: when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
Hot rolling 550MPa level high strength band steel of the present invention; The mechanical property ys ReH >=550MPa of band steel, tensile strength Rm670～830MPa, unit elongation A >=16%;-40 ℃ of ballistic work AKv >=27J; 180 ° of cold bending test d=2a satisfy the technical requirements of engineering machinery with steel, and intensity, plasticity, toughness rational Match.
Embodiment
Specify the embodiment of high strength band steel and method of manufacture thereof below in conjunction with embodiment, but the embodiment of this high strength band steel and method of manufacture thereof is not limited to following embodiment.
Steel plate embodiment one
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 1800mm of the thick 10mm of steel plate is following:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.002％，Nb：0.06％，Ti：0.07％，Al：0.03％，0：0.0011％，N：0.0032％，
All the other are Fe and unavoidable impurities.
Band steel ys ReH is 590Mpa, and tensile strength Rm is 690Mpa, and unit elongation A is that 24% ,-40 ℃ of ballistic work AKv are 130J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment one
The embodiment of this hot rolling high strength band steel method of manufacture is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 165 tons, the mass percent of the composition of preprocessed molten iron is: all the other are Fe and unavoidable impurities for C 4.0% Si 0.26% S 0.002%;
Using S is 15 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.008%, tapping S:0.015%, tapping temperature: 1680 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, composition in (S≤0.006%) fine setting steel (the preceding C of fine setting is 0.05%, is adjusted into 0.07% before the tapping, and the preceding Ti of fine setting is 0.05%, is adjusted into 0.07% before the tapping) is preceding fed Si-Ca line operation 3.0m/t, and stirs 8 minutes a little less than the BOTTOM ARGON BLOWING.
The mass percent of the composition of molten steel is:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.002％，Nb：0.06％，Ti：0.07％，Al：0.03％，0：0.0011％，N：0.0032％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1538 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1240 ℃, heat-up time: 190min; Finishing temperature: 860 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:560 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 590Mpa, and tensile strength Rm is 690Mpa, and unit elongation A is that 24% ,-40 ℃ of ballistic work AKv are 130J, and 180 ° of cold bending test d=2a are qualified.
Steel plate embodiment two
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 2000mm of the thick 4mm of steel plate is following:
C：0.09％，Si：0.10％，Mn：1.55％，P：0.008％，S：0.001％，Nb：0.03％，Ti：0.09％，Al：0.02％，0：0.0012％，N：0.0035％，
All the other are Fe and unavoidable impurities.
Steel plate ys ReH is 600Mpa, and tensile strength Rm is 720Mpa, and unit elongation A is that 23% ,-40 ℃ of ballistic work AKv are 70J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment two
The manufacturing of this hot rolling high strength band steel method of manufacture be the band steel of steel plate embodiment two, present embodiment is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 160 tons, the mass percent of the composition of preprocessed molten iron is: O.002% all the other are Fe and unavoidable impurities to C 4.0% Si 0.28% S;
Using S is 20 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.007%, tapping S:0.014%, tapping temperature: 1685 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, (C was 0.07% to composition before the fine setting, is adjusted into 0.09% before the tapping in the fine setting steel; Ti is 0.07% before the fine setting; Be adjusted into 0.09% before the tapping, Al is 0.01% before the fine setting, is adjusted into 0.02% before the tapping); Feed Si-Ca line operation 3.0m/t before the departures of LF stove, and stirred 8 minutes a little less than the BOTTOM ARGON BLOWING.The mass percent of molten steel is:
C：0.09％，Si：0.10％，Mn：1.55％，P：0.008％，S：0.002％，Nb：0.03％，Ti：0.09％，Al：0.02％，0：0.0011％，N：0.0034％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1535 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1230 ℃, heat-up time: 190min; Finishing temperature: 880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:600 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 600Mpa, and tensile strength Rm is 720Mpa, and unit elongation A is that 23% ,-40 ℃ of ballistic work AKv are 70J, and 180 ° of cold bending test d=2a are qualified.
Steel plate embodiment three
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 1800mm of the thick 16mm of steel plate is following:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.001％，Nb：0.06％，Ti：0.09％，Al：0.03％，0：0.0011％，N：0.0033％，
All the other are Fe and unavoidable impurities.
Steel plate ys ReH is 585Mpa, and tensile strength Rm is 692Mpa, and unit elongation A is that 26% ,-40 ℃ of ballistic work AKv are 150J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment three
The embodiment of this hot rolling high strength band steel method of manufacture is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 165 tons, the mass percent of the composition of preprocessed molten iron is: all the other are Fe and unavoidable impurities for C 4.0% Si 0.30% S 0.002%.
Using S is 15 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.008%, tapping S:0.014%, tapping temperature: 1675 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, (C was 0.07% to composition before the fine setting, is adjusted into 0.08% before the tapping in the fine setting steel; Ti is 0.07% before the fine setting; Be adjusted into 0.09% before the tapping, Al is 0.01% before the fine setting, is adjusted into 0.03% before the tapping); Feed Si-Ca line operation 3.0m/t before the departures of LF stove, and stirred 7 minutes a little less than the BOTTOM ARGON BLOWING.
The mass percent of molten steel is:
C：0.08％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.001％，Nb：0.06％，Ti：0.09％，Al：0.03％，0：0.0011％，N：0.0034％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1534 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1210 ℃, heat-up time: 190min; Finishing temperature: 850 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:550 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 585Mpa, and tensile strength Rm is 692Mpa, and unit elongation A is that 26% ,-40 ℃ of ballistic work AKv are 150J, and 180 ° of cold bending test d=2a are qualified.
Above-mentioned three embodiment when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
Claims (4)
1. hot rolling high strength band steel, the quality per distribution ratio of its chemical ingredients is:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%, S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%, 0≤0.0012%, N≤0.0035%; All the other are Fe and unavoidable impurities;
The ys ReH of band steel is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a.
2. the method for manufacture of a hot rolling high strength band steel, it comprises following sequential steps:
The I converter smelting
With the preprocessed molten iron of S≤0.003%, the steel scrap of S≤0.020% is poured 180 tons of top and bottom combined blown converters into, and pretreated weight of molten iron is than>=70%, taps to stop oxygen blast in preceding 2 minutes; Tapping P≤0.010%, tapping S≤0.020%, tapping temperature≤1690 ℃, tap hole is good; The tapping control quantity of slag is not more than 1.8 tons; Tapping adds lime and alloy at ladle earlier, bag BOTTOM ARGON BLOWING in the ladle of tapping back, thermometric;
II LF refining
After the LF stove takes off the S end, composition in the fine setting steel; Ladle feeds the Si-Ca line 2.5～3.5m/t before going out the LF station, and the weak stirring of BOTTOM ARGON BLOWING is more than 5 minutes;
The mass percent of the composition of molten steel reaches following requirement tapping:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%; S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%; 0≤0.0012%, N≤0.0035%, all the other are Fe and unavoidable impurities;
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast; Teeming temperature is controlled at 1530～1560 ℃;
The VI hot continuous rolling
Slab heating temperature: 1150～1300 ℃, heat-up time is greater than 180min; Finishing temperature: 820～880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:530～620 ℃; Rolling specs; 4～16mm.
3. the method for manufacture of hot rolling high strength band steel according to claim 2; It is characterized in that: behind step VI hot continuous rolling, hot rolled strip is carried out tensile testing, steel plate ys ReH is 580～670Mpa; Tensile strength Rm is 690～750Mpa; Unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a.
4. the method for manufacture of hot rolling high strength band steel according to claim 2 is characterized in that: when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
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Application publication date: 20120425 |