CN104988393A - Production method of steel plate for bridge anchor box - Google Patents
Production method of steel plate for bridge anchor box Download PDFInfo
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- CN104988393A CN104988393A CN201510295073.2A CN201510295073A CN104988393A CN 104988393 A CN104988393 A CN 104988393A CN 201510295073 A CN201510295073 A CN 201510295073A CN 104988393 A CN104988393 A CN 104988393A
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Abstract
The invention discloses a production method of a steel plate for a bridge anchor box. The steel plate for the bridge anchor box comprises the following chemical components in percentage by weight: 0.12-0.18% of C, no more than 0.55% of Si, 0.90-1.70% of Mn, no more than 0.025% of P, no more than 0.010% of S, no more than 0.060% of Nb, no less than 0.015% of Als, and the balance of Fe and inevitable impurities. The method comprises the following steps: when molten steel is cast, a metal wire having the same components with the motel steel is fed into a crystallizer; a steel blank is heated at a temperature of 1180-1280 DEG C; the rough rolling is performed at a temperature of 1200-1000 DEG C; the finish rolling is performed at a temperature of 880-820 DEG C; the cooling is quickly performed with the cooling speed of 5-8 DEG C/s until the temperature reaches 500-600 DEG C; and the natural cooling is performed in air. The production method adopts the continuous cast steel blank as the rolling raw material; and as the metal wire having the same components with the molten steel is fed to the heart part of the crystallizer with high speed, the temperature of the molten steel at the heart part of the crystallizer is expected to be reduced, the temperature distribution of a flowing field at the heart part of the crystallizer is improved, and such problems as heart part looseness and shrinkage caused by final positioning of a liquid core at the heart part in a traditional crystallizer are improved.
Description
Technical field
The present invention relates to steel technical field, particularly relate to a kind of production method of bridge anchor case steel plate.
Background technology
Bridge anchor case steel plate is general thicker, and especially anchor plate, generally at more than 120mm, existing highway bridge engineering design maximum thickness reaches 190mm.Anchor boxboard part is under powerful stay cable force effect, and stress distribution is complicated, and degree of irregularity is serious, requires that steel plate must have higher metallurgical quality and comprehensive mechanical property.But current this kind of anchor case Plate Steel generally adopts the modes such as ingot casting, ESR ingot, vacuum composite rolling to produce.
The rolling raw material adopting vacuum composite rolling mode to adopt is that two or more than two continuous casting steel billet is stacked together and is welded after machining, needs to carry out under high vacuum environment during welding.This kind of technology improves the thickness of raw material, also compression ratio during finished product rolling is namely added, the metallurgical imperfections such as the segregation of original continuous casting steel billet, internal rarefaction can be improved, but this kind of technology needs special vacuum chamber and vacuum electron beam welding equipment, also need to carry out meticulous machining to continuous casting steel billet, operation is comparatively complicated.
The steel plate maximum ga(u)ge adopting electric slag refusion ingot mode to produce can reach 160mm, and the heart portion crystal grain of finished steel plate is comparatively fine and close, but rolling raw material needs to adopt electroslag remelting furnace to smelt, and adds energy consumption.
And directly adopt individual continuous casting steel billet to be the technology of rolling raw material, its compression is smaller, have in order to ensure that mechanical property also needs to carry out normalizing treatment.Although the Plate Steel mechanical property that this kind of technology obtains all can reach technical qualification requirement, because compression ratio is on the low side, the die break in heart portion is insufficient, there is the possibility of the metallurgical imperfections such as internal rarefaction.
Summary of the invention
The application provides a kind of production method of bridge anchor case steel plate, solves in prior art the technical problem that the method complex procedures, the energy consumption that manufacture bridge anchor case steel plate are high, there are the defects such as internal rarefaction.
The application provides a kind of production method of bridge anchor case steel plate, the chemical composition of described bridge anchor case steel plate is designated as by weight percentage: C:0.12 ~ 0.18%, Si≤0.55%, Mn:0.90 ~ 1.70%, P≤0.025%, S≤0.010%, Nb≤0.060%, Ti≤0.030, Als >=0.015%, surplus is Fe and inevitable impurity, described method comprises: when pouring molten steel, the metal wire that feeding is congruent with molten steel in crystallizer; By heating steel billet, Heating temperature 1180 ~ 1280 DEG C; Carry out roughing, roughing temperature is 1200 ~ 1000 DEG C; Carry out finish rolling, final rolling temperature is 880 ~ 820 DEG C; Cooling, is quickly cooled to 500 ~ 600 DEG C with the rate of cooling of 5 ~ 8 DEG C/s, then naturally cooling in atmosphere.
Preferably, the position feeding described metal wire is each 1/4 place, left and right of described crystallizer leptoprosopy medullary ray.
Preferably, the speed V feeding described metal wire is 5 ~ 25 times of steel billet pulling rates.
Preferably, the diameter of metal wire is 2 ~ 5mm.
The application's beneficial effect is as follows:
The rolling raw material of the bridge anchor case steel plate adopting the production method of the application to produce does not adopt ingot casting, electric slag refusion ingot, does not adopt vacuum composite billet yet, still adopts continuous casting steel billet as rolling raw material.Unlike, in order to ensure to realize the higher heart portion metallurgical quality of finished product Plate Steel under small reduction ratio, this project is devoted to the initial grain of refinement continuous casting steel billet.Continuous cast mold is the significant points of continuous caster, and first molten steel forms base shell at crystallizer wall, then solidifies to crystallizer heart portion gradually.At solidification end, shrink due to solid-liquid and compensate without surrounding liquid, heart portion easily produces loose or shrinkage cavity.
The application is by feeding the metal wire congruent with molten steel at a high speed to crystallizer heart portion, to reducing the liquid steel temperature in crystallizer heart portion, improve the temperature distribution in flow field, crystallizer heart portion, simultaneously, the metal wire of feeding also can become nucleating agent when solidifying before dissolving at a high speed, make molten steel solidification simultaneously from crystallizer heart portion, the problem such as internal rarefaction, shrinkage cavity that the last liquid core of traditional crystallizer causes when heart portion can be improved.Due to metal wire and molten steel congruent, thus the final composition to finished steel plate has no significant effect.
The application adopts continuously cast bloom (the thick 300mm of base) to be raw material, realizes rolling Plate Steel under small reduction ratio, and the metallurgical quality of Plate Steel and mechanical property all can obtain and ensure.And aforementioned production method operation is simple, do not need to increase extra energy consumption.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described by the accompanying drawing used required in describing embodiment below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1 is the schema of the production method of a kind of bridge anchor of the application's better embodiment case steel plate.
Embodiment
The embodiment of the present application, by providing a kind of production method of bridge anchor case steel plate, solves in prior art the technical problem that the method complex procedures, the energy consumption that manufacture bridge anchor case steel plate are high, there are the defects such as internal rarefaction.
Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
The application provides a kind of production method of bridge anchor case steel plate, the chemical composition of described bridge anchor case steel plate is designated as by weight percentage: C:0.12 ~ 0.18%, Si≤0.55%, Mn:0.90 ~ 1.70%, P≤0.025%, S≤0.010%, Nb≤0.060%, Ti≤0.030, Als >=0.015%, surplus is Fe and inevitable impurity, described method comprises: when pouring molten steel, the metal wire that feeding is congruent with molten steel in crystallizer; By heating steel billet, Heating temperature 1180 ~ 1280 DEG C; Carry out roughing, roughing temperature is 1200 ~ 1000 DEG C; Carry out finish rolling, final rolling temperature is 880 ~ 820 DEG C; Cooling, is quickly cooled to 500 ~ 600 DEG C with the rate of cooling of 5 ~ 8 DEG C/s, then naturally cooling in atmosphere.
The rolling raw material of the bridge anchor case steel plate adopting the production method of the application to produce does not adopt ingot casting, electric slag refusion ingot, does not adopt vacuum composite billet yet, still adopts continuous casting steel billet as rolling raw material.Unlike, in order to ensure to realize the higher heart portion metallurgical quality of finished product Plate Steel under small reduction ratio, this project is devoted to the initial grain of refinement continuous casting steel billet.Continuous cast mold is the significant points of continuous caster, and first molten steel forms base shell at crystallizer wall, then solidifies to crystallizer heart portion gradually.At solidification end, shrink due to solid-liquid and compensate without surrounding liquid, heart portion easily produces loose or shrinkage cavity.
The application is by feeding the metal wire congruent with molten steel at a high speed to crystallizer heart portion, to reducing the liquid steel temperature in crystallizer heart portion, improve the temperature distribution in flow field, crystallizer heart portion, simultaneously, the metal wire of feeding also can become nucleating agent when solidifying before dissolving at a high speed, make molten steel solidification simultaneously from crystallizer heart portion, the problem such as internal rarefaction, shrinkage cavity that the last liquid core of traditional crystallizer causes when heart portion can be improved.Due to metal wire and molten steel congruent, thus the final composition to finished steel plate has no significant effect.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
The application provides a kind of production method of bridge anchor case steel plate.As shown in Figure 1, be the schema of the production method of a kind of bridge anchor of the application's better embodiment case steel plate.The chemical composition of described bridge anchor case steel plate is designated as by weight percentage: C:0.12 ~ 0.18%, Si≤0.55%, Mn:0.90 ~ 1.70%, P≤0.025%, S≤0.010%, Nb≤0.060%, Ti≤0.030, Als >=0.015%, and surplus is Fe and inevitable impurity.
Described production method comprises the following steps:
Step S11, when pouring molten steel, the metal wire that feeding is congruent with molten steel in crystallizer.Because middle water containing opening on position is crystallizer heart portion, cause inclusion floating to be affected to not affect the distribution in crystallizer flow field, the position of feeding metal wire is each 1/4 place, left and right of crystallizer leptoprosopy medullary ray.Wire-feeding velocity V is 5 ~ 25 times of steel billet pulling rates, when wire-feeding velocity is too fast, as V > 25Vc (Vc is continuous caster pulling rate), easily causes metal wire consumption excessive, and wire injection procedure at a high speed easily causes crystallizer flow field disorderly.When wire-feeding velocity is lower, during as V < 5Vc, then not easily play its beneficial effect.The diameter of metal wire is 2 ~ 5mm.The metal wire of different cross section is selected according to different cast sections.
Step S12, by heating steel billet, Heating temperature 1180 ~ 1280 DEG C, in the present embodiment, the thickness of steel billet is 300mm;
Step S13, carries out roughing, and roughing temperature is 1200 ~ 1000 DEG C;
Step S14, carries out finish rolling, and final rolling temperature is 880 ~ 820 DEG C;
Step S15, cooling, is quickly cooled to 500 ~ 600 DEG C with the rate of cooling of 5 ~ 8 DEG C/s, then naturally cooling in atmosphere.
Pass through aforementioned production method, the Q345qD steel plate of 100 ~ 190mm thickness can be obtained, be 290 ~ 370MPa at the mechanical property ReL at thickness of slab 1/4 place, Rm is 490 ~ 570MPa, A is 20 ~ 36%,-20 DEG C of KV2 are 80 ~ 220J, and the analysis of steel plate low power shows, heart portion has no macroscopic pore and is mingled with.
The rolling raw material of the bridge anchor case steel plate adopting the production method of the application to produce does not adopt ingot casting, electric slag refusion ingot, does not adopt vacuum composite billet yet, still adopts continuous casting steel billet as rolling raw material.Unlike, in order to ensure to realize the higher heart portion metallurgical quality of finished product Plate Steel under small reduction ratio, this project is devoted to the initial grain of refinement continuous casting steel billet.Continuous cast mold is the significant points of continuous caster, and first molten steel forms base shell at crystallizer wall, then solidifies to crystallizer heart portion gradually.At solidification end, shrink due to solid-liquid and compensate without surrounding liquid, heart portion easily produces loose or shrinkage cavity.
The application is by feeding the metal wire congruent with molten steel at a high speed to crystallizer heart portion, to reducing the liquid steel temperature in crystallizer heart portion, improve the temperature distribution in flow field, crystallizer heart portion, simultaneously, the metal wire of feeding also can become nucleating agent when solidifying before dissolving at a high speed, make molten steel solidification simultaneously from crystallizer heart portion, the problem such as internal rarefaction, shrinkage cavity that the last liquid core of traditional crystallizer causes when heart portion can be improved.Due to metal wire and molten steel congruent, thus the final composition to finished steel plate has no significant effect.
The application adopts continuously cast bloom (the thick 300mm of base) to be raw material, realizes rolling Plate Steel under small reduction ratio, and the metallurgical quality of Plate Steel and mechanical property all can obtain and ensure.And aforementioned production method operation is simple, do not need to increase extra energy consumption.
Be described with regard to specific experiment below.
Embodiment 1:
A manufacture method for bridge anchor case steel plate, its chemical composition and weight percent are: C:0.15, Si:0.24, Mn:1.49, P:0.015, S:0.005, Nb:0.035, Ti:0.018, Als:0.025, surplus are Fe and are inevitably mingled with;
Manufacture method, its step:
(1) pouring into a mould section is 300 × 2000mm, and wire diameter is 5mm, and metal wire feeding speed is 25Vc,
(2) by billet heating temperature to 1250 DEG C;
(3) carry out roughing, its start rolling temperature is 1150 DEG C, and roughing end temp is 1050 DEG C;
(4) carry out finish rolling, its start rolling temperature is 840 DEG C, and finish rolling end temp controls at 820 DEG C;
(5) rolling is cooled to 500 DEG C with the rate of cooling of 8 DEG C/s after terminating, and then air cooling steel plate is to room temperature.Steel plate thickness is 190mm.
Embodiment 2:
A manufacture method for bridge anchor case steel plate, its chemical composition and weight percent are: C:0.15, Si:0.24, Mn:1.49, P:0.015, S:0.005, Nb:0.035, Ti:0.018, Als:0.025, surplus are Fe and are inevitably mingled with;
Manufacture method, its step:
(1) pouring into a mould section is 300 × 1600mm, and wire diameter is 4mm, and metal wire feeding speed is 15Vc,
(2) by billet heating temperature to 1250 DEG C;
(3) carry out roughing, its start rolling temperature is 1130 DEG C, and roughing end temp is 1020 DEG C;
(4) carry out finish rolling, its start rolling temperature is 850 DEG C, and finish rolling end temp controls at 830 DEG C;
(5) rolling is cooled to 550 DEG C with the rate of cooling of 7 DEG C/s after terminating, and then air cooling steel plate is to room temperature.Steel plate thickness is 170mm.
Embodiment 3:
A manufacture method for bridge anchor case steel plate, its chemical composition and weight percent are: C:0.15, Si:0.24, Mn:1.49, P:0.015, S:0.005, Nb:0.035, Ti:0.018, Als:0.025, surplus are Fe and are inevitably mingled with;
Manufacture method, its step:
(1) pouring into a mould section is 300 × 1400mm, and wire diameter is 3mm, and metal wire feeding speed is 5Vc,
(2) by billet heating temperature to 1250 DEG C;
(3) carry out roughing, its start rolling temperature is 1120 DEG C, and roughing end temp is 1000 DEG C;
(4) carry out finish rolling, its start rolling temperature is 860 DEG C, and finish rolling end temp controls at 820 DEG C;
(5) rolling is cooled to 600 DEG C with the rate of cooling of 7 DEG C/s after terminating, and then air cooling steel plate is to room temperature.Steel plate thickness is 150mm.
The Main Mechanical of various embodiments of the present invention is in table 1, and sampling point is thickness of slab 1/4 place, and macroscopic examination shows, steel plate heart portion is without macroscopic pore and be mingled with.
The Main Mechanical (sampling point: thickness of slab 1/4 place) of table 1 various embodiments of the present invention
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (4)
1. the production method of a bridge anchor case steel plate, it is characterized in that, the chemical composition of described bridge anchor case steel plate is designated as by weight percentage: C:0.12 ~ 0.18%, Si≤0.55%, Mn:0.90 ~ 1.70%, P≤0.025%, S≤0.010%, Nb≤0.060%, Ti≤0.030, Als >=0.015%, surplus is Fe and inevitable impurity, and described method comprises:
When pouring molten steel, the metal wire that feeding is congruent with molten steel in crystallizer;
By heating steel billet, Heating temperature 1180 ~ 1280 DEG C;
Carry out roughing, roughing temperature is 1200 ~ 1000 DEG C;
Carry out finish rolling, final rolling temperature is 880 ~ 820 DEG C;
Cooling, is quickly cooled to 500 ~ 600 DEG C with the rate of cooling of 5 ~ 8 DEG C/s, then naturally cooling in atmosphere.
2. production method as claimed in claim 1, it is characterized in that, the position feeding described metal wire is each 1/4 place, left and right of described crystallizer leptoprosopy medullary ray.
3. production method as claimed in claim 1, it is characterized in that, the speed V feeding described metal wire is 5 ~ 25 times of steel billet pulling rates.
4. production method as claimed in claim 1, it is characterized in that, the diameter of metal wire is 2 ~ 5mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109022667A (en) * | 2018-09-21 | 2018-12-18 | 南阳汉冶特钢有限公司 | A kind of Q420D super-thick steel plate and its production method |
| CN110396635A (en) * | 2019-08-02 | 2019-11-01 | 南京钢铁股份有限公司 | A kind of smelting process improving surrender 345MPa level structure steel fatigue life |
| CN114622135A (en) * | 2022-02-21 | 2022-06-14 | 柳州钢铁股份有限公司 | Micro-niobium alloyed Q355B low-alloy high-strength structural steel plate and manufacturing method thereof |
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| JP2004060024A (en) * | 2002-07-31 | 2004-02-26 | Sumitomo Metal Ind Ltd | High strength steel sheet having excellent spot weldability and method for producing the same |
| JP2004068050A (en) * | 2002-08-02 | 2004-03-04 | Sumitomo Metal Ind Ltd | High tensile strength cold rolled steel sheet and its manufacturing method |
| CN102330020A (en) * | 2011-10-20 | 2012-01-25 | 武汉钢铁(集团)公司 | Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa |
| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004060024A (en) * | 2002-07-31 | 2004-02-26 | Sumitomo Metal Ind Ltd | High strength steel sheet having excellent spot weldability and method for producing the same |
| JP2004068050A (en) * | 2002-08-02 | 2004-03-04 | Sumitomo Metal Ind Ltd | High tensile strength cold rolled steel sheet and its manufacturing method |
| CN102330020A (en) * | 2011-10-20 | 2012-01-25 | 武汉钢铁(集团)公司 | Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa |
| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109022667A (en) * | 2018-09-21 | 2018-12-18 | 南阳汉冶特钢有限公司 | A kind of Q420D super-thick steel plate and its production method |
| CN110396635A (en) * | 2019-08-02 | 2019-11-01 | 南京钢铁股份有限公司 | A kind of smelting process improving surrender 345MPa level structure steel fatigue life |
| CN114622135A (en) * | 2022-02-21 | 2022-06-14 | 柳州钢铁股份有限公司 | Micro-niobium alloyed Q355B low-alloy high-strength structural steel plate and manufacturing method thereof |
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