CN103741018A - Method for producing light hot rolling H-shaped steel for automobile beam - Google Patents
Method for producing light hot rolling H-shaped steel for automobile beam Download PDFInfo
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- CN103741018A CN103741018A CN201310743076.9A CN201310743076A CN103741018A CN 103741018 A CN103741018 A CN 103741018A CN 201310743076 A CN201310743076 A CN 201310743076A CN 103741018 A CN103741018 A CN 103741018A
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Abstract
The invention relates to a method for producing a light hot rolling H-shaped steel for an automobile beam, and belongs to the technical field of metal material production. The method comprises the following steps: smelting in a converter, refining in an argon blowing station, casting a beam blank, rolling an H-shaped steel, and two-stage selectively cooling, wherein in the step of two-stage selectively cooling, the nozzle of a cooling web is closed, in first-stage cooling, the flange of the H-shaped steel is cooled down to 650-720 DEG C from 800-900 DEG C, the cooling speed is 50-90 DEG C per second; in second-stage cooling, the flange of the H-shaped steel is cooled down to 550-620 DEG C from 650-720 DEG C, the cooling speed is 25-50 DEG C per second; finally, the steel is cooled down to room temperature. Due to cooling by passing through water after rolling, the strength and carrying capacity of the H-shaped steel are improved under the premise of not increasing alloy consumption, so that the method has low production cost and high production efficiency.
Description
Technical field
The invention belongs to metallic substance production technical field, be specifically related to a kind of hot rolled H-shaped production method for light-duty vehicle crossbeam.
Background technology
Along with the improvement of transport by road condition, the effect that transport by road is brought into play in modern logistics is also increasing, has also promoted the development of transport by road equipment thereupon.At present, goods vehicle is as the major equipment of transport by road, to heavy loading, lightness and specialized future development.Meanwhile, also there is variation in the production technique of automotive frame, by the steel plate punched in past, changed into and used solder type girder steel or directly with the hot rolled H-shaped beam that does.
Along with the enforcement of < < highway safety conservation regulation > >; and the severe punishment of overloaded vehicle; past, the simple method that improves the load-carrying of vehicle by increasing the number of axle was not suitable with the needs of existing situation, from the carrier vehicle of heavy and light, became traffic unit and individual first-selection.As the primary member of automobile, the loss of weight of crossbeam is also imperative.Because the current length of the length automotive frame of trailer is generally no more than 13.5 meters, in the situation that length is certain, only have the rice by reducing H shaped steel heavily to reach the object that alleviates crossbeam weight.The hot rolled H-shaped existence of automotive frame that Some Domestic producer develops and produces in batches is at present from great shortcoming; Simultaneously, because automotive frame with hot rolled H-shaped require depth-width ratio large (height of H shaped steel and the ratio of width) and the ratio of the edge of a wing and web large, and under the effect of the nonaffine deformation of H shaped steel in the operation of rolling and the unrelieved stress that produces, adopt the H shaped steel of traditional technology production at the cooling rear edge of a wing and the web wave of easily occurring, cause lumber recovery to decline, increase rolling cost, reduced production efficiency.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides one and can significantly spend and improve hot rolled H-shaped surface quality and lumber recovery automotive frame for, the hot-rolling H-shaped production method that meets automotive frame and make requirement; Further aim of the present invention is the impact that distributes and roll rear process for cooling and improve the unrelieved stress that H shaped steel produces because of nonaffine deformation by rationally depressing, can also wear water cooling by after rolling, in the situation that not increasing alloy consumption, improve the intensity of H shaped steel, make it by Q345 level H shaped steel, bring up to Q420 level, can improve like this supporting capacity of H shaped steel, thereby realize the hot rolled H-shaped production method of automotive frame that production cost is low, production efficiency is high.
Technical scheme of the present invention is: a kind of hot rolled H-shaped production method for light-duty vehicle crossbeam, its method steps comprises: step 1, converter smelting, the elements such as blast-melted middle C, Si, Mn, S, P are adjusted to rational level, and remove the detrimental impurity in molten iron; Step 2, the refining of Argon station regulate chemical composition and the temperature of molten steel under the protection of argon gas, make the composition of molten steel and temperature reach pre-provisioning request; Step 3, Hot Metal in Beam Blank casting, will become deciliter molten steel casting that symbol requires to become rolling blank; Step 4, H section rolling, H section rolling is the process that the Hot Metal in Beam Blank blank after heating is at high temperature produced into H shaped steel by the mode rolling with open cell type roll and universal mill, Hot Metal in Beam Blank is heated to 1190～1240 ℃ through process furnace, 1080～1150 ℃ of bloomer rolling sequence start rolling temperatures, 920～980 ℃ of the start rolling temperatures of universal mill, 800～900 ℃ of finishing temperatures; Step 5, to roll rear two-part selectivity cooling be to roll rolled piece that rear temperature is higher by selecting cooling mode to be cooled to the process of temperature range with joint efforts, by controls, to roll rear speed of cooling to control shape of rolling piece and to obtain tiny microcosmic grain-size.The nozzle of cooling web is closed, and first paragraph is cooling: the edge of a wing of H shaped steel is cooled to 650～720 ℃ by 800～900 ℃, and speed of cooling is 50～90 ℃/s; Second segment is cooling: H section steel flange is cooled to 550～620 ℃ by 650～720 ℃, and speed of cooling is 25～50 ℃/s; Last steel cool to room temperature.
Described step 5 two-part is selected, in method of cooling, at H section steel flange, to arrange one group with upper spray nozzle.
The method is used pressure and the flow of water pump power control device control water coolant.
H section steel flange is after two-part selectivity is cooling, and H shaped steel is through naturally cooling to room temperature.
The present invention has following positively effect: first, described hot rolled H-shaped production method for light-duty vehicle crossbeam, by adopting two-part to select method of cooling, can within a short period of time the H shaped steel with comparatively high temps be evenly cooled to suitable temperature after the hot rolling of H shaped steel; When this method of cooling has reduced causing web and edge of a wing temperature head greatly and being out of shape because of roll cooling water reason in the operation of rolling of rolled piece, web and edge of a wing draught distribute the edge of a wing and the web wave that cause generation, have improved lumber recovery, have improved again production efficiency.Secondly, described hot rolled H-shaped production method for light-duty vehicle crossbeam by rolling rear naturally cooling, improves the intensity of H shaped steel in the situation that not increasing alloy consumption, makes it by Q345 level H shaped steel, bring up to Q420 level, can improve like this supporting capacity of H shaped steel.
Embodiment
Below by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of related each member, structure, each several part and annexation, each several part and principle of work, manufacturing process and operation using method etc., be described in further detail, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme.
Hot rolled H-shaped production method for light-duty vehicle crossbeam, light-duty vehicle crossbeam is greater than 3.0 by hot rolled H-shaped depth-width ratio, the edge of a wing and web thickness ratio are greater than 1.7, this H shaped steel production technique is: the rear two-part selectivity of converter smelting → Argon station refining → Hot Metal in Beam Blank casting → H section rolling → roll is cooling, is specially:
Step 1, converter smelting;
Converter smelting is an oxidising process, the elements such as blast-melted middle C, Si, Mn, S, P is adjusted to rational level, and remove the detrimental impurity in molten iron.The raw material of converter adopts fine fodder, and converter smelting adopts the high method of once re-blowing of drawing, and strictly controls terminal temperature and composition, stops Molten Steel over-oxidation; Red packet tapping; During tapping, slag under strict control, requires pushing off the slag tapping.Terminal Composition Control sees the following form:
Terminal composition and temperature
Step 2, the refining of Argon station;
Regulate chemical composition and the temperature of molten steel, according to the difference of temperature value before argon, adjust in time the feed quantity of argon blowing time and aluminum steel, make activity oxygen in steel be reduced to 30～40ppm left and right, can make again steel inclusion fully float, for continuous casting provides qualified molten steel simultaneously.
Step 3, Hot Metal in Beam Blank casting;
Hot Metal in Beam Blank casting is to become deciliter molten steel casting that symbol requires to become the process of rolling blank.For preventing the secondary oxidation of molten steel in casting cycle, reduce the inclusion content in steel, improve the cleanliness factor of steel, in casting cycle, molten steel adopts long nozzle protection cast from ladle to tundish.
For improving slab quality, alleviate center porosity and segregation, adopt low overheat casting.The cooling-water flowing speed control of crystallizer is built in 5～18m
3/ s, guarantees Inlet and outlet water temperature difference <20 ℃.The covering slag that continuous casting is used is mould flux, has good physicochemical property, can effectively reduce casting billet surface lobe incidence, improves cc billet surface quality.
Step 4, H section rolling;
H section rolling is the process that the Hot Metal in Beam Blank blank after heating is at high temperature produced into H shaped steel by the mode rolling with open cell type roll and universal mill.Enter stokehold, H section steel works is carried out by root visual inspection blank, scabs, crackle, is mingled with the blank that sticks up the surface imperfection such as skin through conscientiously cleaning to having, and can enter stove after qualified.Hot Metal in Beam Blank is heated to 1190～1240 ℃ through process furnace.
All blanks are come out of the stove and are sent before the rolling of BD machine, must be through high-pressure water descaling.According to the blank of different specification size, select the nozzle ring of different size, clean to guarantee the removing of rolled piece scale on surface.Through the rolled piece of de-scaling, by the reciprocal rolling of bloomer, reach the size needing.1080～1150 ℃ of bloomer rolling sequence start rolling temperatures, according to the difference of raw material and final dimension, 7～15 passages of the reciprocal rolling of bloomer are not etc.Respectively be provided with a manipulator with tilting finger before and after bloomer, can be by traversing rolled piece and turn over steel in passage arbitrarily, more reasonable to guarantee deformation of rolled wire, cross dimensions obtains optimum control.
In universal roughing mill group, carry out controlled rolling, 920～980 ℃ of the start rolling temperatures of universal mill, 800～900 ℃ of finishing temperatures.In the operation of rolling, with edge of a wing height change, every time adjusts oscillating roller way height, to guarantee that in the operation of rolling, rolling centerline is constant, reduces to produce the possibility of rolled piece web bias.By small tension control device, can between tandem rolling passage, realize Minimal Tension rolling, reduce the workpiece measurement fluctuation producing because of tension rolling.Universal finishing mill one-pass roller goes out finished product.By automatic gauge control system, automatic thickness control is carried out in the rolled piece edge of a wing and web, guarantee rolling accuracy.
Step 5, to roll rear two-part selectivity cooling;
Rolling rear two-part selectivity cooling is to roll rolled piece that rear temperature is higher by selecting cooling mode to be cooled to the process of temperature range with joint efforts, by controls, to roll rear speed of cooling to control shape of rolling piece and to obtain tiny microcosmic grain-size.The nozzle of cooling web is closed, and first paragraph is cooling: the edge of a wing of H shaped steel is cooled to 650～720 ℃ by 800～900 ℃, and speed of cooling is 50～90 ℃/s; Second segment is cooling: H section steel flange is cooled to 550～620 ℃ by 650～720 ℃, and speed of cooling is 25～50 ℃/s; Last steel naturally cool to room temperature.
Rolled piece is carried out to two-part and select when cooling, after UF universal finishing mill, refrigerating unit to be set, can carry out H section steel flange, web coolingly, H section steel flange is adopted to the water-cooled type of cooling of spray normal temperature.Utilize the rear waste heat of rolling of steel by wearing cooling fast in the hope of after reinforcing bar is rolled of water, steel are when by water cooling plant, by current, covered completely, between current and high temperature steel, form the heat exchange without the forced convection of gas mould, the surface temperature rapid drawdown of steel, produce the larger temperature difference with core, the heat transfer process of steel " lower the temperature-rise again " formula in self, thereby reach the object of steel fast cooling, conventionally by the open and close that regulate H shape steel web and edge of a wing nozzle, just can realize at 5 to 6 seconds and complete cooling task in time range.
Rolled piece is carried out to two-part while selecting cooling actually operating, according to the steel temperature of entering universal mill, at H section steel flange, one or more groups nozzle is set, uses pressure and the flow of water pump power control device control water coolant, reach and control the cooling speed of cooling of two-part selectivity.So the edge of a wing of H shaped steel is cooled to after proper temperature by two-part selectivity method of cooling, the nozzle of the edge of a wing and web is all opened, H section rolling also naturally cools to room temperature after two-part selectivity is cooling again, thereby the intensity of steel and supporting capacity all can strengthen.
Embodiment 1: hot rolled H-shaped production method for light-duty vehicle crossbeam, light-duty vehicle crossbeam by the technique of hot rolled H-shaped rolling is: Hot Metal in Beam Blank is heated to 1220 ℃ in process furnace: 1110 ℃ of bloomer rolling sequence start rolling temperatures, 960 ℃ of the start rolling temperatures of universal mill, 832 ℃ of finishing temperatures; After rolling, adopt immediately two-part selectivity cooling, first paragraph cooling process parameter is: during the beginning to cool down of H shaped steel, temperature is 830 ℃, and during cooling end, temperature is 676 ℃, and speed of cooling is 77 ℃/s; Carry out immediately second segment cooling, processing parameter is: during the beginning to cool down of H shaped steel, temperature is 675 ℃, and during cooling end, temperature is 570 ℃, and speed of cooling is 35 ℃/s.Light-duty vehicle crossbeam is 473 × 151 × 7 × 12 by hot rolled H-shaped specification, Hot Metal in Beam Blank material is low-alloy Q345B before rolling, rolling and wear water cooling after performance be: yield strength 460MPa, tensile strength 575MPa, 25%, 0 ℃ of longitudinal V-type ballistic work of unit elongation is 105J.
Embodiment 2: hot rolled H-shaped production method for light-duty vehicle crossbeam, light-duty vehicle crossbeam by the technique of hot rolled H-shaped rolling is: Hot Metal in Beam Blank is heated to 1210 ℃ in process furnace: 1130 ℃ of bloomer rolling sequence start rolling temperatures, 950 ℃ of the start rolling temperatures of universal mill, 825 ℃ of finishing temperatures; After rolling, adopt immediately two-part selectivity cooling, first paragraph cooling process parameter is: during the beginning to cool down of H shaped steel, temperature is 822 ℃, and during cooling end, temperature is 688 ℃, and speed of cooling is 67 ℃/s; Carry out immediately second segment water cooling, processing parameter is: during the beginning to cool down of H shaped steel, temperature is 686 ℃, and during cooling end, temperature is 586 ℃, and speed of cooling is 34 ℃/s.Light-duty vehicle crossbeam is 475 × 151 × 7 × 13 by hot rolled H-shaped specification, Hot Metal in Beam Blank material is low-alloy Q345B before rolling, rolling and wear water cooling after performance be: yield strength 446MPa, tensile strength 625MPa, 27%, 0 ℃ of longitudinal V-type ballistic work of unit elongation is 87J.
The scope that this production method produces the performance index such as the yield strength, tensile strength of alloy is:
By embodiment 1 and embodiment 2, can find out described hot rolled H-shaped production method for light-duty vehicle crossbeam, by adopt two-part to select, after method of cooling, to have improved lumber recovery in the hot rolling of H shaped steel, improve again production efficiency.Secondly, described hot rolled H-shaped production method for light-duty vehicle crossbeam, cooling by rolling rear two-part selectivity, in the situation that not increasing alloy consumption, improve the intensity of H shaped steel and the supporting capacity of H shaped steel.
Above by the present invention is exemplarily described; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (4)
1. a hot rolled H-shaped production method for light-duty vehicle crossbeam, its method steps comprises:
Step 1, converter smelting, adjust to rational level by blast-melted middle C, Si, Mn, S, P element, and remove the detrimental impurity in molten iron;
Step 2, the refining of Argon station regulate chemical composition and the temperature of molten steel under the protection of argon gas, make the composition of molten steel and temperature reach pre-provisioning request;
Step 3, Hot Metal in Beam Blank casting, will become deciliter molten steel casting that symbol requires to become rolling blank;
Step 4, H section rolling, H section rolling is the process that the special-shaped blank after heating is at high temperature produced into H shaped steel by the mode rolling with open cell type roll and universal mill;
Step 5, the two-part selectivity of carrying out after rolling are cooling, and the nozzle of cooling web is closed, and first paragraph is cooling: the edge of a wing of H shaped steel is cooled to 650～720 ℃ by 800～900 ℃, and speed of cooling is 50～90 ℃/s; Second segment is cooling: H section steel flange is cooled to 550～620 ℃ by 650～720 ℃, and speed of cooling is 25～50 ℃/s; Last steel are cooled to room temperature.
2. hot rolled H-shaped production method for light-duty vehicle crossbeam according to claim 1, is characterized in that: in described step 5 two-part selectivity method of cooling, at H section steel flange, arrange one group with upper spray nozzle.
3. hot rolled H-shaped production method for light-duty vehicle crossbeam according to claim 1, is characterized in that: the method is used pressure and the flow of water pump power control device control water coolant.
4. hot rolled H-shaped production method for light-duty vehicle crossbeam according to claim 1, is characterized in that: H section steel flange is after two-part selectivity is cooling, and H shaped steel is through naturally cooling to room temperature.
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| CN201310743076.9A CN103741018A (en) | 2013-12-30 | 2013-12-30 | Method for producing light hot rolling H-shaped steel for automobile beam |
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| CN201310743076.9A CN103741018A (en) | 2013-12-30 | 2013-12-30 | Method for producing light hot rolling H-shaped steel for automobile beam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032217A (en) * | 2014-06-19 | 2014-09-10 | 马钢(集团)控股有限公司 | Hot-rolled H-shaped steel, and application and production method thereof |
| CN104073717A (en) * | 2014-06-19 | 2014-10-01 | 马钢(集团)控股有限公司 | H-shaped steel as well as application and production method of H-shaped steel |
| CN106755947A (en) * | 2015-11-19 | 2017-05-31 | 财团法人金属工业研究发展中心 | Heat treatment method for metal material |
| CN111187990A (en) * | 2020-03-02 | 2020-05-22 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102330023A (en) * | 2010-07-12 | 2012-01-25 | 马鞍山钢铁股份有限公司 | Steel for H steels at 500MPa level of yield strength and thermomechanical control process thereof |
| CN102644035A (en) * | 2012-04-17 | 2012-08-22 | 马钢(集团)控股有限公司 | Cooling after rolling method for high-weather fastness hot-rolled H-steel with yield strength up to 460MPa |
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2013
- 2013-12-30 CN CN201310743076.9A patent/CN103741018A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330023A (en) * | 2010-07-12 | 2012-01-25 | 马鞍山钢铁股份有限公司 | Steel for H steels at 500MPa level of yield strength and thermomechanical control process thereof |
| CN102644035A (en) * | 2012-04-17 | 2012-08-22 | 马钢(集团)控股有限公司 | Cooling after rolling method for high-weather fastness hot-rolled H-steel with yield strength up to 460MPa |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032217A (en) * | 2014-06-19 | 2014-09-10 | 马钢(集团)控股有限公司 | Hot-rolled H-shaped steel, and application and production method thereof |
| CN104073717A (en) * | 2014-06-19 | 2014-10-01 | 马钢(集团)控股有限公司 | H-shaped steel as well as application and production method of H-shaped steel |
| CN106755947A (en) * | 2015-11-19 | 2017-05-31 | 财团法人金属工业研究发展中心 | Heat treatment method for metal material |
| CN111187990A (en) * | 2020-03-02 | 2020-05-22 | 马鞍山钢铁股份有限公司 | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof |
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