CN104962813B - There is economical high-strength steel and its manufacture method of favorable forming property based on CSP producing line - Google Patents
There is economical high-strength steel and its manufacture method of favorable forming property based on CSP producing line Download PDFInfo
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Abstract
The invention discloses a kind of economical high-strength steel and its manufacture method based on CSP producing line with favorable forming property.The chemical composition of steel per distribution ratio by weight is calculated as：C：0.04～0.07%；Si：0.10～0.30%；Mn：1.20～1.50%；P≤0.015%；S≤0.004%；Ti：0.13～0.18%；Als：0.02～0.04%；N≤0.004%；O≤0.002%；Other are Fe and inevitable tramp element.Its manufacture method includes the step of smelting molten steel, casting steel billet, heating of plate blank, hot continuous rolling, section cooling are processed, batched, the heating-up temperature is 1200～1240 DEG C, start rolling temperature is 1130～1160 DEG C, and finishing temperature is 820～860 DEG C, and coiling temperature is 600～640 DEG C.The intensity of the steel is high, forming property is good, with low cost, and its preparation method process is simple, energy consumption are low.
Description
Technical field
The present invention relates to CSP producing line and the manufacturing technology field containing Ti high-strength steel, specifically refer to a kind of based on CSP producing line tool
There are economical high-strength steel and its manufacture method of favorable forming property.
Background technology
CSP producing line particularly has in thin material producer face because its flow process is short, less energy consumption, the low, production efficiency of investment are high
Advantage, is subject to the pro-gaze of iron and steel enterprise of various countries in recent years.At the same time with the enhancing that energy-saving and emission-reduction are realized, the application of high-strength steel
Scope is more and more wider, thickness specification also more and more thinner.The Thin Specs of 2.0～4.0mm thickness specification, tensile strength >=700MPa level
, when hot continuous rolling producing line is produced, rolling load is big, plate form control ability for high-strength steel, and production efficiency is low, and gives birth in CSP producing line
Produce and but there are no these problems, therefore the research of the high-strength steel of CSP producing line production in recent years is very many.But 2.0～4.0mm thickness
Size high-tensile steel, because rolling in partial, re-crystallization area, is usually present mixed crystal phenomenon in tissue, has had a strong impact on its shaping and has impacted
Performance, significantly limit its range.
In recent years, the research both at home and abroad for CSP producing line production 700MPa level high-strength steel and its manufacture method is very many, but
The focus of research is concentrated mainly on the aspects such as high intensity, ultra-thin specification.The invention of such as Application No. 200910038833.6 is special
Profit, discloses one kind and adopts C：0.03～0.07wt%, Si ＜ 0.30wt%, Mn：1.00～2.10wt%, P≤
0.02wt.%, S≤0.008wt.%, Ti：0.10～0.14wt%, using casting and rolling process obtain yield strength 700MPa,
Thickness specification is the method for 3.0～6.0mm high-strength steel.The patent of invention of Application No. 200610123458.1, discloses one kind
Based on the method that bar strip continuous casting and rolling flow path produces 700MPa grade high-strength weathering steel using Ti microalloying technique, the becoming of its steel
It is divided into C：0.03～0.07wt%, Si：0.3～0.5wt%, Mn：0.6～1.6wt%, P≤0.04wt%, S≤
0.008wt%, Cu：0.2～0.5wt%, Cr：0.3～0.7wt%, Ni：0.15～0.35wt%, Ti：0.08～
0.14wt%, Alt：0.025～0.050wt%, N≤0.008wt%, based on CSP producing line, using 1100～1180 DEG C come out of the stove
Temperature, 870～920 DEG C of finishing temperature, 700～780MPa of yield strength has been obtained, thickness specification is the height of 1.5～8.0mm
Qiang Gang.
Above-mentioned patent only describes the mechanical property of product and impact property, does not describe its forming property, is also not described as
Improve the measure that cold formability can be taken.And in actual application, 2.0～4.0mm of thickness specification, tensile strength >=
The high-strength steel of 700MPa level cold forming occupies the very big market share, and because of thickness of thin, requirement of the user to its forming property
Stricter than think gauge high-strength steel is many.And the thickness specification high-strength steel of foregoing invention CSP producing line production, generally existing is because mixed
Crystalline substance causes the phenomenon that cold forming is ftractureed, and seriously limits its range of application.
Content of the invention
The invention aims to provide a kind of based on CSP producing line have favorable forming property economical high-strength steel and
Its manufacture method.The intensity of the steel is high, forming property is good, with low cost, and its preparation method process is simple, energy consumption are low.
The economical high-strength steel based on CSP producing line with favorable forming property of the present invention, its chemical composition by weight hundred
Distribution ratio is calculated as：C：0.04～0.07%；Si：0.10～0.30%；Mn：1.20～1.50%；P≤0.015%；S≤
0.004%；Ti：0.13～0.18%；Als：0.02～0.04%；N≤0.004%；O≤0.002%；Other are Fe and can not
The tramp element for avoiding.
Preferably, its chemical composition per distribution ratio by weight is calculated as：C：0.05～0.06%；Si：0.15～0.25%；
Mn：1.30～1.40%；P≤0.015%；S≤0.004%；Ti：0.13～0.17%；Als：0.025～0.035%；N≤
0.004%；O≤0.002%；Other are Fe and inevitable tramp element.
The manufacture method of the economical high-strength steel based on CSP producing line with favorable forming property of the present invention, by generally pure
Net steel technique is carried out, the step of process, batches including smelting molten steel, casting steel billet, heating of plate blank, hot continuous rolling, section cooling, its
It is characterized in that：
The heating-up temperature is 1200～1240 DEG C, and start rolling temperature is 1130～1160 DEG C, and finishing temperature is 820～860
DEG C, coiling temperature is 600～640 DEG C.
Preferably, 7 frame finish rolling, the percentage pass reduction of each passage and rolling temperature is adopted to be respectively during the hot continuous rolling：
F1～F3：50～60%, 1000～1160 DEG C；F4：Empty mistake；F5～F7：15～30%, 820～940 DEG C.
Further, during the hot continuous rolling, 7 frames rolling speed is respectively：F1～F2 is 0.45～1.20m/s；F3 is
1.60～2.20m/s；F4 sky mistake；F5～F6 is 4.00～6.50m/s；F7 is 5.50～7.60m/s.
Further, during the hot continuous rolling, F3～F4 interstand cooling water management is in 80～100m3/h.
Further, section cooling is processed using leading portion rapid cooling, every collector water rate control of coarse adjustment section 165～
185m3/ h, every collector water rate control of accurate adjustment section is in 86.5～88.5m3/ h, coarse adjustment section cooldown rate are 40～100 DEG C/s.
Also further, section cooling is processed using leading portion rapid cooling, and every collector water rate control of coarse adjustment section is in 175m3/ h,
Every collector water rate control of accurate adjustment section is in 87.5m3/ h, coarse adjustment section cooldown rate are 50～90 DEG C/s.
In CSP producing line using mentioned component and technique, mixed crystal phenomenon present in high-strength steel is eliminated, its cold-bending property is
D=0,180 ° qualified, can meet user and be processed into square tube, and carry out secondary forming requirement to square tube.
In the present invention, the mechanism of action of each alloying component content principle of qualification and preparation technology parameter is as follows：
Ti：Using Ti precipitation strength, for relatively Nb, Mo, cost of alloy decline about 10～30%, excellent with significant cost
Gesture.Ti element 0.04～0.11% scope, the Ti for not increasing by 0.01% about increases 30MPa.When Ti content is less than 0.04%
When, intensity is improved significantly, mostlys come from crystal grain refinement；When Ti content is 0.04～0.11%, intensity improves notable, master
Precipitation strength to be come from, now intensity increase sharply with the increase of Ti content；When Ti content is more than 0.11%, intensity
Increase eases up.Active in view of Ti chemical property, it is the recovery rate for ensureing Ti element, while avoiding strength fluctuation, Ti content sets
It is set to 0.13～0.18%, preferably Ti：0.13～0.17%.But Ti element chemistry performance is active, its precipitating reinforcing effect with
In steel, the constituent content such as S, N, O is closely related, it is therefore necessary to the content of S, N, O element in strict control steel.
S：S is harmful element in steel, is combined generation Ti with Ti2S4C4, consume Ti content, and Ti2S4C4It is rolled into ribbon
It is mingled with, easily ftractures in cold forming process.Therefore strictly control S≤0.004% in the present invention.
N：The energy that Ti is combined generation TiN with N is very low, therefore begins to separate out successively during the solidification of molten steel of steel containing Ti
TiN.The presence of N not only can seriously reduce the effective content of Ti, affect the precipitation strength of TiC, and TiN particle is square, often
A few micrometers are reached, often becomes shaping or the formation of crack in impact process.Therefore, in the present invention strict control N content, i.e. N≤
0.004%.
O：Ti2O3Chemical potential energy compared with TiN, Ti2S4C4, Ti (CN) low, therefore which generates Ti at first in steel containing Ti2O3.
Ti2O3Size larger, to precipitation strength have no contribution.Therefore molten steel must could add Ti with after the abundant deoxidation of aluminium.Therefore,
O content is controlled within 0.002% in the present invention.
The present invention is had in the manufacture process of economical high-strength steel of favorable forming property based on CSP producing line：
Strict control heating-up temperature, because heating-up temperature makes the most of carbonitride solid solution once again for having existed, then
Rolling and coiling process in separate out, play a part of crystal grain refinement and precipitation strength, but the fine grain effect of Ti be weaker, when plus
When hot temperature is more than 1240 DEG C, crystalline grain of steel containing Ti starts roughening.In conjunction with CSP producing line feature, Soaking Pit Temperature is set as 1200
～1240 DEG C.
Strict controlled rolling passage and reduction ratio, because the strand of CSP producing line production is directly entered finish rolling after going out soaking pit
Unit, is rolled in 1100～900 DEG C of scope, it is impossible to avoid rolling in the range of partial, re-crystallization area and causing mixed crystal.
The relatively thin material of thickness of slab, because drafts is big, crystal grain is fully refined, and mixed crystal degree can almost be ignored.And the thicker steel plate of thickness of slab
Because deflection is limited, there is partial, re-crystallization, crystal grain is grown up inequality and forms mixed crystal.Therefore deposit in control 2.0～4.0mm product
Mixed crystal phenomenon be key of the production with favorable forming property high-strength steel.Tiny alloying element Ti can significantly inhibit austenite again
Crystallization, 0.13%Ti can make the recrystallization temperature of mild steel austenite improve to 980 DEG C.Therefore F1, F2, F3 milling train adopts high temperature
(>=1000 DEG C) large strain deforms (>=50%), exactly in order to bring it about austenite perfect recrystallization, so ensures that
Original austenite is changed from as cast condition dendrite to equiax crystal, and facilitates homogenization and the refinement of equiax crystal.
Cooling water between strict control frame：F3～F4 interstand cooling water is adjusted to maximum, is accelerated the cooling of strip, makes band
940 DEG C～1000 DEG C of partial, re-crystallization area avoided between F3～F5 by steel.And cooling water between F1～F2, F2～F3 is closed,
Reduce the temperature drop between F1～F3 frame, it is ensured that F3 is still rolled in perfect recrystallization area.
Strict controlled rolling speed：Rolling speed can cause strip turnaround time at high temperature to extend excessively slowly so that shape
Become energy storage release, reduce nucleation rate.Accelerate F5～F7 frame rolling speed then can crystal grain thinning, and section cooling section shorten
Cool time, accelerate cooldown rate, be conducive to the intensive forming core of phase transformation, prevent crystal grain from growing up.
Finishing temperature：Relatively low finishing temperature, can make the reply degree of austenite less, and its Strain Accumulation effect is more preferable,
Ferrite Enhancing Nucleation Density is bigger, so as to reach the purpose of fine grain.
Section cooling：Using leading portion rapid cooling, and the collector water yield is adjusted to maximum, increase cooldown rate, exactly in order to increase
The driving force that austenite changes, accelerates phase transition process, and when ferrite nucleus is not grown up completely, phase transformation is completed, so as to obtain
Tiny ferrite crystal grain.High-strength steel with fine ferrite, in plastic history, produces the number of dies of deformation relatively
Many, the correspondingly deformation force born by each crystal grain is less, makes bulk deformation more uniform, thus can improve its deformation energy
Power.
Using manufacture method of the present invention, the mixed crystal phenomenon in steel is not only eliminated, and crystallite dimension is more tiny, steel plate
Cold-bending property be greatly improved, d=0, the requirement of 180 ° of clod washes can be met, and roll-in and punch process can be carried out, processing
The square tube for becoming also has secondary forming ability, can meet the various use requirements of user.
Description of the drawings
The microstructure schematic diagram of the steel plate that Fig. 1 is manufactured for the inventive method.
Fig. 2 is the microstructure schematic diagram of the steel plate for being provided without the inventive method production.
Specific embodiment
Below in conjunction with specific embodiment to the present invention based on CSP producing line have favorable forming property economical high-strength steel and
Its manufacture method is described in further detail.
By composition of steel design requirement of the present invention, heat (batch) number example tri- groups of steel of A, B, C are smelted, specific chemical composition is shown in Table 1.
The chemical composition (wt%) of 1 present example of table
| Heat (batch) number | C | Si | Mn | P | S | Ti | N | Als | O |
| Example A | 0.046 | 0.28 | 1.25 | 0.006 | 0.0034 | 0.136 | 0.0030 | 0.024 | 0.0015 |
| Example B | 0.068 | 0.12 | 1.46 | 0.010 | 0.0028 | 0.158 | 0.0033 | 0.036 | 0.0018 |
| Example C | 0.055 | 0.20 | 1.33 | 0.011 | 0.0030 | 0.175 | 0.0028 | 0.032 | 0.0014 |
Tri- groups of steel of heat (batch) number example A, B, C roll into coil of strip example 1～6 respectively, and wherein comparative example 7 is by heat (batch) number example C rolling
Become, comparative example 7 takes traditional rolling mill practice, concrete steel rolling process is shown in Table 2 and table 3.
2 present example of table is contrasted with the manufacturing process of comparative example
3 present example of table and the manufacturing process of comparative example
In above table, it is 1. reduction ratio (%), is 2. temperature (DEG C), is 3. speed (m/s).
Product made from steel service check result to numbering example 1～6 and comparative example 7 is as shown in table 4.
The each example of table 4 and the product made from steel performance comparison of comparative example
Combined by the detection of table 4 and can be seen that, the yield strength of 1～6 product made from steel of example, tensile strength are high compared with comparative example 7, and
, there is no mixed crystal phenomenon in even tissue, cold-bending property is greatly improved.
Meanwhile, using Conventional processing methods produce product heterogeneous microstructure as shown in figure 1, in figure exist serious
Mixed grain structure, and be in banding, grain size is 8.0～11.5 grades, and the square tube one which is made shapes and ftractures.And adopt the present invention
The steel plate heterogeneous microstructure of technique productions is as shown in Fig. 2 nothing mixed crystal phenomenon in not only organizing, and crystal grain is thinner, is 12.5 grades,
The square tube which is made can meet secondary forming various requirement.
Claims (4)
1. a kind of economical high-strength steel based on CSP producing line with favorable forming property, it is characterised in that the chemical composition of the steel
Per distribution ratio is calculated as by weight：C：0.05～0.06%；Si：0.15～0.25%；Mn：1.30～1.40%；P≤0.015%；
S≤0.004%；Ti：0.13～0.17%；Als：0.025～0.035%；N≤0.004%；O≤0.002%；Other are Fe
And inevitable tramp element, its manufacture method is carried out by usual clean steel technique, including smelting molten steel, casting steel billet, plate
The step of base heating, hot continuous rolling, section cooling are processed, are batched；The heating-up temperature is 1200～1240 DEG C, and start rolling temperature is
1130～1160 DEG C, finishing temperature is 820～860 DEG C, and coiling temperature is 600～640 DEG C；7 frames are adopted during the hot continuous rolling
Finish rolling, the percentage pass reduction of each passage and rolling temperature are respectively：F1～F3：50～60%, 1000～1160 DEG C；F4：Empty mistake；
F5～F7：15～30%, 820～940 DEG C；7 frames rolling speed is respectively：F1～F2 is 0.45～1.20m/s；F3 is 1.60
～2.20m/s；F4 sky mistake；F5～F6 is 4.00～6.50m/s；F7 is 5.50～7.60m/s.
2. there is the economical high-strength steel of favorable forming property according to claim 1 based on CSP producing line, it is characterised in that
During the hot continuous rolling, F3～F4 interstand cooling water management is in 80～100m3/h.
3. the economical high-strength steel based on CSP producing line with favorable forming property according to claim 1 or claim 2, its feature are existed
In section cooling is processed using leading portion rapid cooling, and every collector water rate control of coarse adjustment section is in 165～185m3/ h, accurate adjustment section is per root collection
Pipe water rate control is in 86.5～88.5m3/ h, coarse adjustment section cooldown rate are 40～100 DEG C/s.
4. there is the economical high-strength steel of favorable forming property according to claim 3 based on CSP producing line, it is characterised in that
Section cooling is processed using leading portion rapid cooling, and every collector water rate control of coarse adjustment section is in 175m3/ h, the every collector water yield control of accurate adjustment section
System is in 87.5m3/ h, coarse adjustment section cooldown rate are 50～90 DEG C/s.
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| CN106244921B (en) * | 2016-08-30 | 2018-05-01 | 武汉钢铁有限公司 | A kind of method in CSP producing lines using rolling in ferrite domains production mild steel |
| CN107130178A (en) * | 2017-04-27 | 2017-09-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of high-strength wheel steel of 500Mpa grades of automobile and its CSP technique productions methods |
| CN107130179A (en) * | 2017-04-27 | 2017-09-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Low manganese micro titanium alloy Q345B hot rolled strips and the production method based on CSP flows |
| CN113512678B (en) * | 2021-04-18 | 2023-10-20 | 武汉轻工大学 | Low-silicon titanium-containing high-strength steel and rolling control method based on titanium content and rolling parameters |
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| CN100435987C (en) * | 2006-11-10 | 2008-11-26 | 广州珠江钢铁有限责任公司 | Method for manufacturing 700MPa high-strength weathering steel based on thin slab continuous casting and rolling flow by use of Ti microalloying process |
| CN100557060C (en) * | 2007-01-12 | 2009-11-04 | 武汉钢铁(集团)公司 | The manufacture method of C-Mn-Ti series hot-rolled high strength high magnetic induction performance steel |
| CN103966504B (en) * | 2013-01-24 | 2016-12-28 | 宝山钢铁股份有限公司 | A kind of 500MPa level low yield strength ratio straight weld steel pipe and manufacture method thereof |
| CN103484764B (en) * | 2013-09-11 | 2015-09-30 | 首钢总公司 | Ti precipitation strength type superhigh-strength hot rolls thin plate and production method thereof |
| CN104561486B (en) * | 2015-01-22 | 2017-01-11 | 首钢总公司 | Thick hot continuous rolling steel strip with excellent ultralow temperature CTOD (China railway high speed) performance and production method thereof |
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Effective date of registration: 20170809 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Hubei, Wuhan, Wuchang Friendship Road, No. 999, block A, floor 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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