CN113943892A - Preparation method of low-cost Ti microalloyed thin 700 MPa-grade steel belt for automobile crossbeam - Google Patents
Preparation method of low-cost Ti microalloyed thin 700 MPa-grade steel belt for automobile crossbeam Download PDFInfo
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- CN113943892A CN113943892A CN202111087272.6A CN202111087272A CN113943892A CN 113943892 A CN113943892 A CN 113943892A CN 202111087272 A CN202111087272 A CN 202111087272A CN 113943892 A CN113943892 A CN 113943892A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses a preparation method of a low-cost Ti microalloyed thin 700 MPa-grade steel strip for an automobile crossbeam, which fully exerts the functions of fine grain strengthening and precipitation strengthening of a Ti element by performing key control on smelting components, key control on casting blank heating temperature, key control on steel coil cooling mode and key control on coiling temperature, and obtains a steel coil with the thickness of 2.0-6.0 mm and the thickness of 700MPa, which has low production cost, stable performance control and excellent comprehensive performance. Compared with the existing girder steel of the grade in the current market, the 700MPa girder steel produced by the method has the advantages that the production cost can be reduced by more than 95 yuan/ton, the profitability of the product is improved, and the alloy resources in China are saved.
Description
Technical Field
The invention relates to the technical field of automobile beam steel product production, in particular to a preparation method of a low-cost Ti microalloyed thin 700 MPa-grade steel strip for an automobile beam.
Background
With the development of light weight of automobiles, 700MPa grade high-strength beam steel is widely applied. The 700MPa grade girder steel with the thickness specification of 2.0-6.0 mm is mainly used for processing parts such as side beams, side plates and the like of a load-carrying and traction automobile. Its advantages are high strength, high welding performance and high plastic deformation capacity. The 700MPa grade high-strength beam steel produced in the current market is basically designed by adopting low C + Nb + Ti components. The component design can lead the material to have good comprehensive performance and meet the use requirements of customers. However, the current situation of China is that Nb element resources are scarce, Ti element resources are rich, and according to the current alloy price, the cost of adding 0.01 percent of Nb element in steel is increased by 27 yuan/ton, and the cost of adding 0.01 percent of Ti element is increased by 3 yuan/ton. The 700MPa grade product designed by adopting the conventional components has higher production cost and small obtained profit, and enterprises can not reduce cost and improve efficiency. On the premise of ensuring that the product performance is unchanged or meeting the use requirements of customers, the 700 MPa-level high-strength beam steel is designed and produced by using the low-C + Ti components, the production cost can be greatly reduced, not only is the enterprise helped to reduce the cost and increase the profit, but also the resources are saved.
The prior patents are studied as follows:
according to the 700 MPa-grade automobile beam steel strip and the preparation method thereof, 0.045-0.055% of Nb element and 0.065-0.085% of Ti element are added to obtain the beam steel strip with the yield strength of more than or equal to 600MPa, the tensile strength of 720-950 MPa, the elongation of more than or equal to 20% and the-20 ℃ impact value of more than or equal to 70J. The steel strip has good formability, low-temperature toughness and fatigue resistance, and is used for manufacturing parts of heavy commercial vehicles. Although the method disclosed by the invention realizes the batch production of 700MPa grade girder steel, the expensive alloy element Nb is added, so that the production cost is increased, and the resources are consumed.
The method for improving the performance stability of the niobium-titanium composite reinforced 700MPa girder steel whole coil is characterized in that 0.02-0.04% of Nb element, 0.08-0.10% of Ti element and 0.020-0.03% of Mo element are added, and a girder steel coil with the thickness of 2.0-12.0 mm and the tensile strength of more than 700MPa is obtained by matching with a corresponding heating and cooling process. The overall performance fluctuation of the steel strip produced by the method is controlled within 70MPa, and the performance stability is improved. . Although the method disclosed by the invention realizes the mass production of 700MPa grade girder steel and reduces the problems of inconsistent deformation caused by unstable strength in the processing process and the like, the production cost is increased due to the addition of expensive alloy elements Nb and Mo, and the popularization of the product is not facilitated. .
According to the method, 0-0.03% of Nb element and 0.05-0.10% of Ti element are added to obtain the steel strip for the girder, wherein the yield strength of the steel strip is more than 600MPa, the tensile strength of the steel strip is more than 710MPa, and the elongation after fracture of the steel strip is more than 23%. The girder steel produced by the method not only has excellent comprehensive performance, but also has lower production cost. However, this patent also has two disadvantages: firstly, the range of production process parameters given by the patent is wide; secondly, the patent only discusses that the purpose of adding Ti element into steel is to improve the product strength by virtue of the precipitation strengthening effect, but does not discuss the control requirement of N element which has important influence on the strengthening effect of Ti element. The patent has little guiding significance for actual production.
Disclosure of Invention
The invention aims to provide a preparation method of a low-cost Ti microalloyed thin 700 MPa-grade steel strip for an automobile crossbeam. According to the method, the functions of fine grain strengthening and precipitation strengthening of the Ti element are fully exerted by key control of smelting components, key control of casting blank heating temperature, key control of steel coil cooling mode and key control of coiling temperature, and the steel coil for the crossbeam with the thickness of 700MPa, which is low in production cost, stable in performance control and excellent in comprehensive performance, is obtained. Compared with the existing girder steel of the grade in the current market, the 700MPa girder steel produced by the method has the advantages that the production cost can be reduced by more than 95 yuan/ton, the profitability of the product is improved, and the alloy resources in China are saved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a low-cost Ti microalloyed thin 700MPa grade steel belt for an automobile beam comprises the following steps:
smelting raw materials are sequentially subjected to KR molten iron desulphurization pretreatment, converter top and bottom blowing, LF refining, RH refining and continuous casting process treatment to form a high-purity continuous casting billet, wherein P is less than or equal to 0.015%; s is less than or equal to 0.008 percent; the vacuum degree requirement of the RH procedure is less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min. The pure degassing time of circulation is ensured to be more than or equal to 7min during the RH vacuum treatment period. After RH vacuum treatment is finished, calcium wires are fed for calcium treatment, and soft blowing time is ensured to be more than 8min after wire feeding; adopting a continuous casting billet soft reduction technology to control center segregation;
the method comprises the steps of rolling by a 2250mm hot continuous rolling mill set, wherein the thickness of the continuously cast slab is 230mm, heating the continuously cast slab to 1250-1270 ℃ by a stepping heating furnace, discharging, performing two-stage controlled rolling by a rough rolling mill set and a finish rolling mill set, wherein the rolling pass is 3+3, the mode is 6 passes in total, the thickness of an intermediate billet is larger than or equal to 55mm, the start rolling temperature of finish rolling is smaller than or equal to 980 ℃, the finish rolling temperature is 835-855 ℃, uniformly cooling by adopting a front concentrated laminar cooling mode, namely, the speed of 20-30 ℃/s, and coiling at 590-610 ℃.
Further, the low-cost Ti microalloyed thin 700MPa grade automobile beam steel comprises the following chemical components in percentage by mass: 0.06-0.08% of C, less than or equal to 0.10% of Si, 1.30-1.50% of Mn, 0.090-0.105% of Ti, 0.020-0.050% of Alt, less than or equal to 0.015% of P, less than or equal to 0.008% of S, and the balance of Fe and inevitable impurities.
Further, the low-cost Ti microalloyed thin 700MPa grade automobile beam steel comprises the following chemical components in percentage by mass: 0.08% of C, 0.08% of Si, 1.39% of Mn, 0.08% of Ti, 0.033% of Alt, 0.014% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
Further, the low-cost Ti microalloyed thin 700MPa grade automobile beam steel comprises the following chemical components in percentage by mass: 0.07% of C, 0.06% of Si, 1.41% of Mn, 0.09% of Ti, 0.032% of Alt, 0.009% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
Further, the low-cost Ti microalloyed thin 700MPa grade automobile beam steel comprises the following chemical components in percentage by mass: 0.07% of C, 0.06% of Si, 1.41% of Mn, 0.09% of Ti, 0.028% of Alt, 0.009% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
Further, the low-cost Ti microalloyed thin 700MPa grade automobile beam steel comprises the following chemical components in percentage by mass: 0.07% of C, 0.04% of Si, 1.36% of Mn, 0.09% of Ti, 0.040% of Alt, 0.015% of P, 0.005% of S, and the balance of Fe and inevitable impurities.
The main elements are selected for the following reasons:
c: the C content in the steel increases, the yield strength and the tensile strength increase, but the ductility and the toughness decrease. For the girder steel, if the carbon content is too high, the toughness of the steel is rapidly reduced, and the weldability is deteriorated, so that the design idea of adopting low-carbon components is the premise of designing the automobile steel products. Therefore, the carbon content is controlled to be less than or equal to 0.08 percent.
Si: the deoxidizing elements, which are solid-dissolved in ferrite, can improve the strength of the steel. However, if the Si content is too high, red oxide is easily generated on the surface of the steel strip, which affects the surface quality of the steel strip. The control range of Si element is 0.03-0.10%.
Mn: manganese can be infinitely replaced and dissolved with iron, is a good solid solution strengthening element, is mainly used for compensating the strength loss caused by the reduction of the content of C in automobile steel, and is the most important and most economic strengthening element. Mn is also an element for expanding a gamma phase region, can reduce the gamma-alpha phase transition temperature of steel, is beneficial to obtaining a fine phase transition product, and can improve the toughness of the steel and reduce the ductile-brittle transition temperature. Therefore, the manganese content of the invention is 1.30-1.50%.
Ti: titanium is active in chemical properties, and nitrogen and carbon in steel form compounds such as TiNC, TiC and the like. Some of the nano-scale fine second phases can be enriched on the grain boundary to block the migration of the grain boundary, thereby reducing the grain size and playing a role in fine grain strengthening; some of the components are diffused and distributed on a ferrite matrix to block dislocation motion, so that the precipitation strengthening effect is achieved. However, when the content of titanium in the steel reaches a certain value, the strengthening effect is not significantly increased by further increasing the titanium content. Therefore, the Ti content is controlled to be 0.090-0.105 percent.
N: controlling the content of N element in steel is an important factor for strengthening Ti element. In the steelmaking process, Ti and N react to form large-size irregular TiN, and the TiN can not improve the strength of the product and reduce the impact toughness of the product. Meanwhile, the more the content of the N element is, the more the consumed Ti element is, and the less TiC which can improve the strength is formed in the later process. Therefore, the content of the N element is controlled below 60ppm in the invention.
And (3) Alt: the deoxidizing element is added with a proper amount of aluminum to form fine and dispersed AlN particles, which is beneficial to refining crystal grains and improving the toughness of steel, and the content of Alt is controlled to be 0.020-0.050%.
P, S: is an inevitable impurity element in steel, the lower the content of the impurity element is, the better the content of the impurity element is, but the lower the content of the impurity element is, the production cost is increased, and the P is less than or equal to 0.015 percent and the S is less than or equal to 0.008 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the production technology of the girder steel with the tensile strength of 700MPa provided by the invention breaks through the traditional Nb and Ti composite addition component design, improves the product strength by adding a single Ti element, and realizes the purposes of cost reduction, efficiency improvement and environmental protection of enterprises. According to the calculation of the current alloy price, compared with the above mentioned patent I and patent II, the technical scheme of the invention can reduce the addition cost of the product alloy by 100 yuan/ton.
(2) Because of active chemical properties, Ti element reacts with non-metallic elements such as O, N, S in steel, penetrates through the whole production process from steel making to steel coil stacking, and is greatly influenced by temperature, and the large-scale application of the Ti element is always restricted by the stability control of the strengthening effect of the Ti element. The invention provides a method for stably producing low-carbon Ti microalloyed high-strength steel, which overcomes the problem of large performance fluctuation of Ti microalloyed steel by controlling the processes such as N element content, slab secondary heating temperature, slab tapping temperature, coiling temperature and the like. The 700MPa grade girder steel has excellent performance and stable control.
(3) The 700MPa grade girder steel product improves the product strength through Ti element, replaces the conventional component design of improving the strength through composite addition of Nb element and Ti element, and reduces the alloy addition cost of the product. Meanwhile, the invention provides a stable batch production scheme of Ti alloyed low-carbon high-strength steel, and promotes the stable application of Ti, which is an alloy element with low price, in steel.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the metallographic structure of a steel strip according to an example at different positions, wherein polygonal ferrite and a small amount of pearlite are shown in the metallographic structure, the grains are fine and uniform, and the size of the grains is more than 11.5 grade.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
A method for manufacturing a steel coil for a crossbeam with Ti micro tensile strength of 700MPa by adopting a TMCP (thermal mechanical control processing) production process. The production process flow relates to: KR desulfurization, converter, LF furnace, RH, slab continuous casting, reheating furnace, rough rolling high-pressure water descaling, fixed width press, E1R1 rough rolling machine, E2R2 rough rolling machine, heat preservation cover, flying shear, finish rolling high-pressure water descaling, F1-F7 finishing rolling machine, dense laminar cooling, coiling, tray transportation system, sampling and inspection.
Smelting raw materials are sequentially subjected to KR molten iron desulphurization pretreatment, converter top and bottom blowing, LF refining, RH refining and continuous casting process treatment to form a high-purity continuous casting billet, wherein P is less than or equal to 0.015%; s is less than or equal to 0.008 percent; the vacuum degree requirement of the RH procedure is less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min. The pure degassing time of circulation is ensured to be more than or equal to 7min during the RH vacuum treatment period. And after the RH vacuum treatment is finished, feeding a calcium wire for calcium treatment, and ensuring that the soft blowing time is more than 8min after wire feeding. And adopting a continuous casting billet soft reduction technology to control center segregation.
The method comprises the steps of rolling by a 2250mm hot continuous rolling mill set, wherein the thickness of the continuously cast slab is 230mm, heating the continuously cast slab to 1250-1270 ℃ by a stepping heating furnace, discharging, performing two-stage controlled rolling by a rough rolling mill set and a finish rolling mill set, wherein the rolling pass is 3+3, the mode is 6 passes in total, the thickness of an intermediate billet is larger than or equal to 55mm, the start rolling temperature of finish rolling is smaller than or equal to 980 ℃, the finish rolling temperature is 835-855 ℃, uniformly cooling by adopting a front concentrated laminar cooling mode, namely, the speed of 20-30 ℃/s, and coiling at 590-610 ℃.
Example one
The weight percentage of the used components of the experimental steels with 4 numbers in actual smelting is shown in Table 1, Table 2 is a specific process system of the example steels, and Table 3 is the mechanical properties of the example steels.
Table 1 chemical composition (wt%) of the examples steel
| Examples | C | Si | Mn | P | S | Alt | Ti | N |
| 1 | 0.08 | 0.08 | 1.39 | 0.014 | 0.004 | 0.033 | 0.08 | 45ppm |
| 2 | 0.07 | 0.06 | 1.41 | 0.009 | 0.004 | 0.032 | 0.09 | 40ppm |
| 3 | 0.07 | 0.06 | 1.41 | 0.009 | 0.004 | 0.028 | 0.09 | 38ppm |
| 4 | 0.07 | 0.04 | 1.36 | 0.015 | 0.005 | 0.040 | 0.09 | 50ppm |
Table 2 examples steel process schedule
TABLE 3 mechanical Properties of the steels of the examples
As can be seen from the embodiment, the chemical and mechanical properties of the steel strip provided by the embodiment of the invention meet the standard requirement of BT700L, the allowance is moderate, the yield strength R el is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 700MPa, and the elongation A is more than or equal to 17%. Meanwhile, the product has good welding performance and forming performance.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A preparation method of a low-cost Ti microalloyed thin 700MPa grade steel belt for an automobile beam is characterized by comprising the following steps:
smelting raw materials are sequentially subjected to KR molten iron desulphurization pretreatment, converter top and bottom blowing, LF refining, RH refining and continuous casting process treatment to form a high-purity continuous casting billet, wherein P is less than or equal to 0.015%; s is less than or equal to 0.008 percent; the vacuum degree requirement of the RH procedure is less than or equal to 2.6mbar, and the vacuum maintaining time is more than or equal to 10 min. The pure degassing time of circulation is ensured to be more than or equal to 7min during the RH vacuum treatment period. After RH vacuum treatment is finished, calcium wires are fed for calcium treatment, and soft blowing time is ensured to be more than 8min after wire feeding; adopting a continuous casting billet soft reduction technology to control center segregation;
the method comprises the steps of rolling by a 2250mm hot continuous rolling mill set, wherein the thickness of the continuously cast slab is 230mm, heating the continuously cast slab to 1250-1270 ℃ by a stepping heating furnace, discharging, performing two-stage controlled rolling by a rough rolling mill set and a finish rolling mill set, wherein the rolling pass is 3+3, the mode is 6 passes in total, the thickness of an intermediate billet is larger than or equal to 55mm, the start rolling temperature of finish rolling is smaller than or equal to 980 ℃, the finish rolling temperature is 835-855 ℃, uniformly cooling by adopting a front concentrated laminar cooling mode, namely, the speed of 20-30 ℃/s, and coiling at 590-610 ℃.
2. The method for preparing the steel strip for the low-cost Ti microalloyed thin 700MPa automotive frame as claimed in claim 1, wherein the chemical components of the low-cost Ti microalloyed thin 700MPa automotive frame steel in percentage by mass are as follows: 0.06-0.08% of C, less than or equal to 0.10% of Si, 1.30-1.50% of Mn1.090-0.105% of Ti, 0.020-0.050% of Alt, less than or equal to 0.015% of P, less than or equal to 0.008% of S, and the balance of Fe and inevitable impurities.
3. The method for preparing the steel strip for the low-cost Ti microalloyed thin 700MPa automotive frame as claimed in claim 2, wherein the chemical components of the low-cost Ti microalloyed thin 700MPa automotive frame steel in percentage by mass are as follows: 0.08% of C, 0.08% of Si, 1.39% of Mn, 0.08% of Ti, 0.033% of Alt, 0.014% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
4. The method for preparing the steel strip for the low-cost Ti microalloyed thin 700MPa automotive frame as claimed in claim 2, wherein the chemical components of the low-cost Ti microalloyed thin 700MPa automotive frame steel in percentage by mass are as follows: 0.07% of C, 0.06% of Si, 1.41% of Mn, 0.09% of Ti, 0.032% of Alt, 0.009% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
5. The method for preparing the steel strip for the low-cost Ti microalloyed thin 700MPa automotive frame as claimed in claim 2, wherein the chemical components of the low-cost Ti microalloyed thin 700MPa automotive frame steel in percentage by mass are as follows: 0.07% of C, 0.06% of Si, 1.41% of Mn, 0.09% of Ti, 0.028% of Alt, 0.009% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
6. The method for preparing the steel strip for the low-cost Ti microalloyed thin 700MPa automotive frame as claimed in claim 2, wherein the chemical components of the low-cost Ti microalloyed thin 700MPa automotive frame steel in percentage by mass are as follows: 0.07% of C, 0.04% of Si, 1.36% of Mn, 0.09% of Ti, 0.040% of Alt, 0.015% of P, 0.005% of S, and the balance of Fe and inevitable impurities.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114672741A (en) * | 2022-04-15 | 2022-06-28 | 包头钢铁（集团）有限责任公司 | Preparation method of high-strength high-toughness steel BT600HQK for hot forming automobile axle housing |
| CN115747617A (en) * | 2022-11-29 | 2023-03-07 | 北京科技大学 | Titanium-reinforced automobile girder steel, preparation method and application |
| CN115747643A (en) * | 2022-11-01 | 2023-03-07 | 本钢板材股份有限公司 | 1.2-2.0 mm thin 700MPa hot-rolled beam steel and preparation method thereof |
| CN115747617B (en) * | 2022-11-29 | 2024-04-19 | 北京科技大学 | Titanium reinforced automobile girder steel, preparation method and application |
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| CN112030071A (en) * | 2020-08-19 | 2020-12-04 | 本钢板材股份有限公司 | 510 MPa-grade high-toughness automobile girder steel and preparation method thereof |
| CN112226676A (en) * | 2020-09-03 | 2021-01-15 | 包头钢铁（集团）有限责任公司 | Low-cost L320MS/X46MS hot-rolled steel strip for hydrogen sulfide corrosion resistant welded pipe and manufacturing method thereof |
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| CN115747617B (en) * | 2022-11-29 | 2024-04-19 | 北京科技大学 | Titanium reinforced automobile girder steel, preparation method and application |
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