CN103031419B - Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery - Google Patents
Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery Download PDFInfo
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Abstract
The invention discloses a method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, which comprises the following steps: refining and heating molten steel with Ti addition amount of 0.07-0.14% and roughing the molten steel to obtain an intermediate billet; heating the edge of the intermediate billet and then finish rolling to obtain a hot rolled plate; cooling the hot rolled plate in a U-shape and rolling into a hot roll; and straightening the hot roll and obtaining the product. According to the method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, the performance uniformity of the final product in the rolling direction is improved in the U-shaped cooling model in the cooling process, and the comprehensive yield is improved. With the adoption of edge inductive heating of the intermediate billet, the performance uniformity of the final product in the horizontal direction is improved, and the safety of the material in the using process is improved.
Description
Technical field
The present invention relates to ferrous materials production technical field, particularly a kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose leads to the method for volume performance uniformity.
Background technology
The high-strength steel for engineering mechanism purpose of yield strength 460MPa ~ 700MPa has been widely used in manufacturing truck-mounted crane, truck mounted concrete pump arm and other heavy mechanical equipments at present, the alloying constituent system generally adopted both at home and abroad is Ti microalloying ingredient system, add the Ti of 0.07% ~ 0.14%, rely on the precipitating reinforcing effect of TiC significantly to improve the strength level of material.
To be the Introduction To Cn Patent of 101538680 a kind of based on the CSP mode of production produces the production method of 600MPa level high-strength steel for publication number, but how this patent does not control to study and set forth to material logical volume homogeneity.Patent publication No. a kind of hot continuous rolling mode that has been the Introduction To Cn Patent of 101899616A produces the production method of 600MPa level high-strength steel, does not study coil of strip Internal and external cycle performance and width homogeneity and sets forth equally.Relate in the patent of 700MPa level high-strength steel production method, publication number has been the Introduction To Cn Patent of 101538681, and a kind of employing Nb-Ti-V microalloying produces high-strength steel with yield strength of 700 MPa, publication number a kind of production method adopting high Cr+Nb+Ti strengthening digestion 700MPa level high-strength steel that has been the Introduction To Cn Patent of 101768698A, although above patent gives concrete rolling technological parameter scope, all not to coil of strip logical volume performance uniformity with how plate width direction performance uniformity improves and improvement is studied targetedly and sets forth.
For Ti content 0.07% ~ 0.14% the production of yield strength 460MPa ~ 700MPa high-strength steel for engineering mechanism purpose hot continuous rolling coiled sheet, the deficiencies in the prior art part is:
(1) coil of strip innermost circle and outmost turns low strength, the logical volume properties percent of pass along rolling direction declines.Prior art does not propose effective innovative approach to the strength property how improving coil of strip innermost circle and outmost turns.
(2) do not pay close attention to the performance inconsistency problem of high-strength steel for engineering mechanism purpose along plate width direction, Thin Specs (≤5mm) high-strength steel for engineering mechanism purpose generally to decline 150 ~ 300MPa along two edge strength propertys of plate width direction, and material in use has great potential safety hazard.Prior art does not propose effective innovative approach to how improving coil of strip strength property in the width direction.
By checking prior art patent and document, have no the report about how improving along rolling direction and horizontal mechanical performance homogeneity for Ti micro-alloyed high strength steel for engineering mechanism purpose hot-rolled sheet coil product, this patent is verified according to industrial practice, propose the measure that a kind of effective Ti of improvement micro-alloyed high strength steel leads to volume performance uniformity, lumber recovery is significantly improved, and can avoid in user's use procedure due to potential safety hazard that the performance inconsistency of material different positions causes.
Summary of the invention
Technical problem to be solved by this invention is to provide one can improve lumber recovery, and material different positions performance inconsistency in the middle of use procedure can be avoided to cause a kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose of potential safety hazard to lead to the method for volume performance uniformity.
For solving the problems of the technologies described above, the invention provides a kind of method that the Ti of raising micro-alloyed high strength steel for engineering mechanism purpose leads to volume performance uniformity, comprising: by Ti addition be the molten steel of 0.07% ~ 0.14% by after refining, heating, then obtain intermediate blank after carrying out roughing;
After described intermediate blank is carried out Edge Heating, then carry out finish rolling acquisition hot-rolled sheet;
Hot rolled coil is coiled into after described hot-rolled sheet is carried out U-shaped cooling;
Described hot rolled coil aligning is opened after putting down and obtain finished product.
Further, described when described intermediate blank is carried out Edge Heating, before finish rolling, use induction heater to carry out Edge Heating described intermediate blank, make the intermediate blank temperature after heating higher than roughing end temp 0 ~ 150 DEG C.
Further, described hot-rolled sheet is carried out U-shaped cooling after when coiling into hot rolled coil, make the coiling temperature in described hot-rolled sheet innermost circle 15 meters than the coiling temperature height 15-20 DEG C of described hot-rolled sheet middle part, make the coiling temperature in described hot-rolled sheet outmost turns 15 meters than the coiling temperature height 10-15 DEG C of described hot-rolled sheet middle part.
A kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose provided by the invention leads to the method for volume performance uniformity, by adopting U-shaped cooling mode in process of cooling, improve hot continuous rolling coil of strip innermost circle and outmost turns intensity mechanical property, thus improve the performance uniformity of the finished product along rolling direction, improve finished product rate.By adopting intermediate blank edge induction heating, making up Thin Specs intermediate blank edge and to dispel the heat the temperature drop caused, thus improving the finished product transversely performance uniformity, improve material security in use.
Embodiment
A kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose provided by the invention leads to the method for volume performance uniformity, by adopting U-shaped cooling mode in process of cooling, improve hot continuous rolling coil of strip innermost circle and outmost turns intensity mechanical property, thus improve the performance uniformity of the finished product along rolling direction; By adopting intermediate blank edge induction heating, making up Thin Specs intermediate blank edge and to dispel the heat the temperature drop caused, thus improving the finished product transversely performance uniformity.Specifically comprise the following steps:
Step S1: by Ti addition be the molten steel of 0.07% ~ 0.14% by after refining, heating, then obtain intermediate blank after carrying out roughing.
Step S2: after intermediate blank is carried out Edge Heating, then carry out finish rolling acquisition hot-rolled sheet.When intermediate blank is carried out Edge Heating, induction heater intermediate blank is used to carry out Edge Heating before finish rolling, make the intermediate blank temperature after heating higher than roughing end temp 0 ~ 150 DEG C, be used for making up the too fast temperature drop caused of Thin Specs intermediate blank edge heat radiation, thus improve the finished product transversely performance uniformity.
Step S3: coil into hot rolled coil after hot-rolled sheet is carried out U-shaped cooling.When coiling into hot rolled coil after hot-rolled sheet is carried out U-shaped cooling, make the coiling temperature in hot-rolled sheet innermost circle 15 meters than the coiling temperature height 15-20 DEG C of hot-rolled sheet middle part, make the coiling temperature in hot-rolled sheet outmost turns 15 meters than the coiling temperature height 10-15 DEG C of hot-rolled sheet middle part.By optimizing the coiling temperature curve shape in process of cooling, the precipitating reinforcing effect caused due to Internal and external cycle rapid heat dissipation after making up strip coiling weakens, thus improves the performance uniformity of the finished product along rolling direction.
Be 0.07% ~ 0.14% high-strength steel for engineering mechanism purpose for Ti addition, the strength property that material is high mainly relies on the nano level precipitation strength of Ti and refined crystalline strengthening to realize, and prior art has a large amount of relevant report to material reinforcement mechanism.But hot continuous rolling coil of strip head, middle and end lead to volume performance uniformity and still need to strengthen along the research work of plate width direction performance uniformity.Coil of strip innermost circle and outmost turns 15 meters are all in unstable properties state, especially coil of strip innermost circle, strength property and toughness properties are all unstable, this is due to for hot continuous rolling coiled sheet, it is higher that strip steel head position enters final rolling temperature, roll speed and section cooling speed relative to coil of strip medium position comparatively slowly, cause coarse grains, and Fracture of Material declines; After strip coiling in process air cooler, because the innermost circle of coil of strip directly contacts with air with outmost turns, temperature drop relatively comparatively fast causes the precipitating reinforcing effect batched in rear steel to weaken, and the strength of materials declines compared with coil of strip middle part.
For along rolling direction inner ring of steel coil and outer ring strength degradation problem, the method for a change coiling temperature curve shape that the present invention adopts, adopts U-shaped cooling, i.e. coil of strip innermost circle and outmost turns 15 meters of coiling temperatures raising 10 ~ 20 DEG C compared with normal position, middle part.Be specially and coiled sheet innermost circle 15 meters of coiling temperatures are improved 15-20 DEG C, coiled sheet outmost turns 15 meters of coiling temperatures improve 10-15 DEG C, the precipitating reinforcing effect caused due to Internal and external cycle rapid heat dissipation after making up strip coiling weakens, thus improves the performance uniformity of the finished product along rolling direction.Verified by industrial production, after adopting U-shaped cooling, Ti microalloying coil of strip innermost circle 15 meters of strength propertys significantly improve, can meet the specification and require and lead to volume to improve to performance uniformity along rolling, simultaneously owing to controlling coiling temperature within certain temperature range, separate out while quantity increases and to grow up and not obvious, material has good plasticity and toughness simultaneously.
Be 0.07% ~ 0.14% high-strength steel for engineering mechanism purpose hot-rolled sheet coil for Ti addition, with steel lateral performance, there is fluctuation larger problem equally, the Thin Specs high-strength steel of particularly≤5mm, horizontal two edges place intensity compared with middle normal portions, the maximum 300MPa that declines of intensity.According to GB inspecting standard, user only checks steel plate width 1/4th place performance to replace whole inspection lot performance, and the degradation problem of steel plate width edge is easy to be left in the basket.Due to very little to the edge resection of steel plate in common engineering steel for engineering mechanism purpose user use procedure, so the security of lower general who has surrendered to materials'use of edge strength property causes great hidden danger.By carrying out edge and middle part tissue, separate out and mechanical property contrast discovery, the reason causing transversely edge strength property to decline to a great extent is that semifinished product edge rapid heat dissipation result in edge temperature lower than middle part in the operation of rolling, special in thin slab product, before intermediate blank enters finishing mill, the temperature of horizontal edge is lower than more than 50 DEG C, normal position, middle part, finish rolling stage edge temperature lower than or close to starting temperature of transformation, before entering section cooling, edge has started to start phase transformation under lower cooling rate, phase-change organization is generally ferrite+perlite, this being organized in can continue to grow up in laminar cooling process, cause coarse grains, cause mechanical properties decrease, simultaneously due to a large amount of pearlitic formation, combine without enough C and Ti after batching rolling and formed nano level precipitation, intensity is caused to decline to a great extent.The effective measure improving the horizontal edge strength property of Ti micro-alloyed high strength steel hot-rolled coil are not proposed in prior art.
Invention describes a kind of method of effective raising Ti micro-alloyed high strength steel lateral performance homogeneity, namely induction heater is used to heat edge before intermediate blank enters finish rolling, make the intermediate blank temperature after heating higher than roughing end temp 0 ~ 150 DEG C, make up the too fast temperature drop caused of Thin Specs intermediate blank edge heat radiation, thus improve the finished product transversely performance uniformity.By the temperature compensation of strip edge heater before finish rolling, avoid and undergo phase transition in finishing stands, ensure that the homogeneity of the horizontal edge of steel plate and middle part rolling temperature, avoid a large amount of pearlitic formation, thus have sufficient TiC to separate out after making section cooling and batching, significantly improve strength property.
The method of the improvement Ti micro-alloyed high strength steel of introduction of the present invention has the following advantages:
(1) method is easy to implement, has batch production feasibility.U-shaped cooling only need be carried out setting to section cooling pattern and can realize, and the use of strip edge heater only need carry out temperature setting.
(2) significantly can improve the logical volume performance uniformity of coil of strip, improve finished product rate.The improvement of coil of strip performance and edge performance end to end can significantly improve lumber recovery, reduces the lumber recovery loss that cutting head cutting tail and trimming cause.
(3) improve material security in use.High-strength steel for engineering mechanism purpose is generally applied to the key stressed member of heavy mechanical equipment, the performance inconsistency of steel plate different positions can cause great potential safety hazard, the steel plate that the inventive method is produced effectively improves material logical volume performance uniformity, and safety in utilization is guaranteed.
It is Ti content is the high-strength steel for engineering mechanism purpose of 0.07% ~ 0.14% yield strength 460MPa ~ 700MPa that the specific embodiment of the invention relates to volume steel grade, is further described the present invention below by way of several specific embodiment.
Embodiment one
A kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose that the present embodiment provides leads to the method for volume performance uniformity, curve shape is batched by changing, employing U-shaped cools, and coiled sheet innermost circle 15 meters of coiling temperatures are improved 15-20 DEG C, and coiled sheet outmost turns 15 meters of coiling temperatures improve 10-15 DEG C.In the present embodiment, the coiling temperature set(ting)value of former technique is 600 DEG C, and inner ring of steel coil to be rolled up in 15 meters by coiling temperature according to 620 DEG C of controls by the present invention, by coiling temperature in coil of strip outmost turns 15 meters according to 615 DEG C of controls.Then in the middle part of coiled sheet inner ring 3 meters of, coil of strip, mechanical properties test is carried out in normal position and the 1.5 meters of samplings of coiled sheet outmost turns.In test item, impact specimen is of a size of 5mm*10mm*55mm.The chemical composition of test steel and mechanical property are in table 1, table 2.
Table 1 high-strength steel chemical composition
Table 2 high-strength steel hot-rolled coil different positions mechanical property
For the high-strength machinery hot-rolled sheet coil of Ti microalloying yield strength 460MPa ~ 700MPa in the present embodiment, by adopting U-shaped process for cooling, coil of strip innermost circle and outmost turns intensity significantly improve.Steel for engineering mechanism purpose as high-strength in 700MPa level, by U-shaped process for cooling, inner ring 3 meters of yield strengths improve 65MPa, and tensile strength improves 40MPa, and unit elongation and ballistic work meet technological standard requirement; Coil of strip outmost turns 1.5 meters of intensity improve 30MPa, and unit elongation and ballistic work meet technological standard requirement.For 600MPa and 460MPa intensity rank Ti micro-alloyed high strength steel, adopt U-shaped process for cooling same coil of strip Internal and external cycle strength property to improve, make logical volume mechanical property all reach standard-required, rolling direction logical volume mechanical property uniformity improves.
Embodiment two
A kind of Ti of raising micro-alloyed high strength steel for engineering mechanism purpose that the present embodiment provides leads to the method for volume performance uniformity, heat by intermediate blank first being used before finish rolling induction heater, make the intermediate blank temperature after heating higher than roughing end temp 0 ~ 150 DEG C, make up Thin Specs intermediate blank edge to dispel the heat the temperature drop caused, thus improve the finished product transversely performance uniformity.The steel grade that the present embodiment is selected is yield strength 700MPa grade Ti micro-alloying high-strength steel, and Ti content is 0.12%, and specific chemical composition is in table 3.In production technique, roughing end temp set(ting)value is 1080 DEG C, and according to method of the present invention, intermediate blank carries out edge induction heating before entering finish rolling, and Heating temperature is set as 1150 DEG C.All the other rolling technological parameters are identical.Contrast does not use strip edge heater mill product material along steel plate horizontal mechanical performance homogeneity under using strip edge heater and general technology.The final thickness of steel plate rolling is 3mm and 5mm, and Interventions Requested are longitudinal stretching test, and edge check position is distance edges of boards 10mm ~ 30mm place.Mechanical properties test the results are shown in Table 4.
Table 3 high-strength steel chemical composition
| C | Si | Mn | P | S | Alt | Mo | Nb | Ti | [N] |
| 0.065 | 0.20 | 1.85 | 0.011 | 0.003 | 0.043 | 0.16 | 0.065 | 0.12 | 0.003 |
Table 4 high-strength steel hot-rolled coil different positions mechanical property
For the high-strength machinery hot-rolled sheet coil of Ti microalloying yield strength 700MPa level in the present embodiment, by using strip edge heater to intermediate blank, plate wide width portion longitudinal strength significantly improves.By inspection, after using strip edge heater, the longitudinal yield strength of the high-strength steel for engineering mechanism purpose of 3mm thick 700MPa level is increased to 735MPa by 464MPa, and tensile strength is increased to 775MPa by 660MPa, and unit elongation reaches technological standard requirement; The longitudinal yield strength of the high-strength steel for engineering mechanism purpose of 5mm thick 700MPa level is increased to 715MPa by 575MPa, and tensile strength is increased to 760MPa by 695MPa, and unit elongation reaches technological standard requirement.Find by observing metallographic structure and separating out, do not use strip edge heater edging tissue to be thick ferrite+pearlitic structure, separate out less; Use after strip edge heater, edging tissue is the polygonal ferrite of refinement and observed a large amount of nano level TiC and separate out, and causes intensity to significantly improve.
Embodiment three
The difference of the present embodiment and embodiment one is, inner ring of steel coil to be rolled up in 15 meters by coiling temperature according to 615 DEG C of controls by the present embodiment, by coiling temperature in coil of strip outmost turns 15 meters according to 610 DEG C of controls.Elsewhere and embodiment one completely the same.
Embodiment four
The difference of the present embodiment and embodiment one is, inner ring of steel coil to be rolled up in 15 meters by coiling temperature according to 618 DEG C of controls by the present embodiment, by coiling temperature in coil of strip outmost turns 15 meters according to 613 DEG C of controls.Elsewhere and embodiment one completely the same.
Embodiment five
The difference of the present embodiment and embodiment two is, in the present embodiment production technique, roughing end temp set(ting)value is 1080 DEG C, and according to method of the present invention, intermediate blank carries out edge induction heating before entering finish rolling, and Heating temperature is set as 1230 DEG C.
Embodiment six
The difference of the present embodiment and embodiment two is, in the present embodiment production technique, roughing end temp set(ting)value is 1080 DEG C, and according to method of the present invention, intermediate blank carries out edge induction heating before entering finish rolling, and Heating temperature is set as 1100 DEG C.
Embodiment seven
The difference of the present embodiment and embodiment two is, in the present embodiment production technique, roughing end temp set(ting)value is 1080 DEG C, and according to method of the present invention, intermediate blank carries out edge induction heating before entering finish rolling, and Heating temperature is set as 1200 DEG C.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. improve the method that Ti micro-alloyed high strength steel for engineering mechanism purpose leads to volume performance uniformity, it is characterized in that, comprising:
By Ti addition be the molten steel of 0.07% ~ 0.14% by after refining, heating, then obtain intermediate blank after carrying out roughing;
After described intermediate blank is carried out Edge Heating, then carry out finish rolling acquisition hot-rolled sheet;
Hot rolled coil is coiled into after described hot-rolled sheet is carried out U-shaped cooling;
Described hot-rolled sheet is carried out U-shaped cooling after when coiling into hot rolled coil, make the coiling temperature in described hot-rolled sheet innermost circle 15 meters than the coiling temperature height 15-20 DEG C of described hot-rolled sheet middle part, make the coiling temperature in described hot-rolled sheet outmost turns 15 meters than the coiling temperature height 10-15 DEG C of described hot-rolled sheet middle part;
Described when described intermediate blank is carried out Edge Heating, before finish rolling, use induction heater to carry out Edge Heating described intermediate blank, make the intermediate blank temperature after heating higher than roughing end temp 0 ~ 150 DEG C.
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| CN104087831B (en) * | 2014-07-15 | 2017-03-01 | 首钢总公司 | A kind of manufacture method of 100MPa rank low-yield building aseismicity steel |
| CN106734196B (en) * | 2017-01-11 | 2018-12-14 | 首钢京唐钢铁联合有限责任公司 | Strip steel rolling method |
| CN114309086B (en) * | 2022-01-05 | 2024-02-23 | 湖南华菱涟钢特种新材料有限公司 | Preparation method for improving performance uniformity of Ti-reinforced cold-formed high-strength steel |
| CN116144888B (en) * | 2023-02-01 | 2024-02-20 | 北京科技大学 | Double-phase steel plate strip homogenizing hanging coil and cooling control quality adjusting method based on transverse and longitudinal temperature difference |
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| JP2829510B2 (en) * | 1996-05-13 | 1998-11-25 | 株式会社神戸製鋼所 | Method for producing high-strength hot-rolled steel sheet with excellent ductility and workability |
| JP3546266B2 (en) * | 1999-07-26 | 2004-07-21 | Ｊｆｅスチール株式会社 | High strength hot rolled steel sheet excellent in workability and method for producing the same |
| CN101538681A (en) * | 2009-05-06 | 2009-09-23 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 700MPa level |
| CN101538680A (en) * | 2009-05-06 | 2009-09-23 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 600MPa |
| CN101768698B (en) * | 2010-01-27 | 2011-06-22 | 莱芜钢铁股份有限公司 | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof |
| CN101899616B (en) * | 2010-07-22 | 2012-05-23 | 河北省首钢迁安钢铁有限责任公司 | Steel for 600MPa-grade high-strength engineering machines and production method thereof |
| CN102226249A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | High-strength hot rolled steel plate with excellent cold forming property and preparation method thereof |
| CN102226250B (en) * | 2011-06-13 | 2013-09-18 | 马鞍山钢铁股份有限公司 | Hot rolled steel plate with yield strength being 700MPa and preparation method thereof |
| CN102409233A (en) * | 2011-11-03 | 2012-04-11 | 首钢总公司 | Low-temperature steel for engineering machinery and production method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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