CN101845587B - Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof - Google Patents
Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof Download PDFInfo
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- CN101845587B CN101845587B CN2010101477734A CN201010147773A CN101845587B CN 101845587 B CN101845587 B CN 101845587B CN 2010101477734 A CN2010101477734 A CN 2010101477734A CN 201010147773 A CN201010147773 A CN 201010147773A CN 101845587 B CN101845587 B CN 101845587B
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Abstract
The invention belongs to steel with a yield ratio no larger than 0.8 for hot rolling a U-shaped steel sheet pile and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 1.0-1.8% of Mn, 0.22-0.5% of Si, no more than 0.02% of P, no more than 0.02% of S, 0.01-0.06% of Als, 0.02-0.18% of V, 0.01-0.08% of Ca and the balance of Fe and inevitable impurities; and the preparation method thereof comprises the following steps: smelting; refining in a converter; starting to add Al wires based on 3-5m/ton steel from the moment 5-10 minutes before finishing refining in the converter; starting to add Si-Ca wires based on 3-5m/ton steel from the moment 2.5-7 minutes before finishing refining in the converter; carrying out continuous casting; heating continuously cast blooms to 1150-1250 DEG C; and rolling.
Description
Technical field
The present invention relates to a kind of steel sheet pile with steel and production method thereof, specifically belong to yield tensile ratio less than 0.8 steel for hot-rolled U-shaped steel sheet pile and production method thereof.
Background technology
Steel sheet pile began in Europe to produce in 20 beginnings of the century, and 1903, Japan adopted in the retaining soil construction in this shop of Mitsui by import first, and based on the special use properties of steel sheet pile, nineteen twenty-three, Japan's a large amount of imports in the big earthquake calamity recovery project in the Northeast are adopted.Because steel sheet pile has bigger market potential and development prospect, 1931, Japan produced in domestic the beginning.Steel sheet pile has the light-duty and hot rolling type of cold bending thin wall, because the former has bigger processing, use limitation, thereby the hot-rolled steel sheet pile becomes the main flow of steel sheet pile production development.
Steel sheet pile has a lot of unique functions and advantage, thereby its purposes is very extensive, such as architectural at permanent structure, can be used for harbour, unloading apron, levee revetment, revetment, shelves cob wall, seawall, training wall, dock, gate or the like; On the temporary structure thing, can be used for sealing a mountain pass, expand temporarily bank, cutout, bridge construction cofferdam, large-scale pipeline and lay the retaining soil of interim irrigation canals and ditches excavation, dash, the husky wall of retaining etc.; In flood-fighting, can be used for flood control, anti-landslide, prevent subsiding, preventing drift sand etc.Steel sheet pile is the fixation means as shore protection, bulkhead wall and harbour, river.Nineteen ninety-five, Bingku county south earthquake has taken place in Japan.In the earthquake, various Infrastructure have been subjected to serious damage, comprise the equipment in harbour and river.Infringement also becomes opportunity, and after this, relevant Infrastructure is being subject to the people's attention aspect the shockproof security, and steel sheet pile does not come into one's own aspect the anti-seismic performance as fixation means.Therefore in order to improve the shock resistance of fixation means, just require the hot-rolled steel sheet stake to have lower yield tensile ratio.Under harsh distortion load, the viscous deformation consistence of hot-rolled steel sheet pile is crucial, and the effective ways of raising viscous deformation performance are the yield tensile ratios that reduces steel.Yield tensile ratio is low more, and material is big more to the needed deformation quantity of final fracture from the beginning viscous deformation, thereby has improved its plastic deformation ability, can effectively alleviate the stress concentration that produces because of overload, makes building slab absorb more seismic energy.Otherwise if the too high overload unstability that causes owing to local gross distortion of then can causing of yield tensile ratio.From this angle, yield tensile ratio is low more just safe more, and therefore developing low yield strength ratio hot-rolled steel sheet pile has been the task of top priority.
Indexs such as the tensile strength of model, steel sheet pile of steel sheet pile and yield strength have been stipulated among Europe up-to-date hot-rolled steel sheet pile beacon accurate BS EN 1993-5:2007 and the U.S. mark A 572/A 572M-07.Nippon Standard JIS A 5528:2006 and CNS GB/T20933-2007 have equally also just provided the indexs such as chemical ingredients, cross section parameter, tensile strength and yield strength of hot-rolled steel sheet pile.
Summary of the invention
The objective of the invention is to solve the above-mentioned deficiency that exists with steel in this technical field, provide a kind of yield tensile ratio less than 0.8, as shore protection, bulkhead wall and harbour, river fixation means, be particularly useful for the steel for hot-rolled U-shaped steel sheet pile and the production method thereof of the shockproof and antidetonation relief fixed buildings of fixed buildings.
Realize the technical measures of above-mentioned purpose:
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.12～0.20%, Mn 1.0～1.8%, Si 0.22～0.50%, P≤0.02%, S≤0.02%, Als 0.01～0.06%, V 0.02～0.18%, Ca 0.001～0.008%, all the other are Fe and unavoidable impurities.
It is: the weight percent of Ca is 0.002～0.005%.
A kind of yield tensile ratio less than the hot-rolled steel sheet pile with the method for steel, its step:
1) smelts: control its tapping temperature at 1640～1660 ℃;
2) carry out converter refining: control its refining time at 30～55 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 60～120 kg/ton steel;
3) when finishing preceding 5～10 minutes, converter refining begins to add the Al line according to 3～5 meters/ton steel;
4) when finishing preceding 2.5～7 minutes, converter refining begins to add the Si-Ca line according to 3～10 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 0.5～4%;
6) continuously cast bloom is heated to 1150～1250 ℃;
7) be rolled: control every time draft 10～20%, control roughing accumulative total draft is 50～80%, and control finish rolling accumulative total draft is 25～45%.
The effect of each alloying element and mechanism among the present invention:
C:C is the principal element of decision hardness of steel, is to form pearlitic essential substance, and the hardness and the intensity of the form of carbide in steel and how many decision steel, promptly intensity, the hardness along with the increase steel of C content increases, and the plasticity of steel and toughness descend.So C content should not be too high, and carbon is to improve the effective elements of intensity, and C content should not be low excessively.Therefore, C content is controlled in 0.12～0.20% scope.
To improve the intensity of material, it is again good reductor and sweetening agent to the main solid solution of Mn:Mn, contains a certain amount of manganese and can eliminate or weaken the fragility that steel causes because of sulphur, thereby improve the processing characteristics of steel in ferrite.But when manganese content is higher, the tendency that makes the crystalline grain of steel alligatoring is arranged, smelt casting and roll postcooling not at that time, make steel produce white point easily, so Mn content is difficult too high, so Mn content is controlled in 1.0～1.8% scopes.
Si:Si does not form carbide in steel, be that the form with sosoloid is present in ferrite or the austenite, significantly improves elastic limit, yield strength and the yield tensile ratio of steel, so Si content is unsuitable too high to the greatest extent, so be controlled in 0.22～0.50% scope.
S, P:S, P are intensive crack sensitivity elements, thereby should be low as much as possible, the S too high levels, can form a large amount of MnS, MnS easily separates out at crystal boundary when solidification of molten steel, is rolled into band shape and be mingled with when hot rolling, has reduced the ductility and the toughness of steel, therefore S content is low more good more, and S content is controlled at≤and 0.020%.P can improve the low temperature brittleness transition temperature, and the low temperature impact properties of steel is declined to a great extent, so general requirement P≤0.020%.
V: the carbonitride of vanadium form with small and dispersed in ferrite is evenly separated out, and can significantly improve the tensile strength of material and yield strength increases not obviously, effectively reduces the yield tensile ratio of material.
Als:Al is that the nitrogen agent is decided in the deoxidation when being used as steel-making, N in Al and the steel forms tiny infusibility AlN particle, the infusible compound that these small and disperseds distribute plays resistance inhibitor action, and then refinement ferrite crystal grain, the content of Al is low excessively, and the effect of refinement ferrite crystal grain is not obvious, the too high levels of Al, can make the flowability of molten steel reduce the numerous Al of formation
2O
3Can locate dross at the mouth of a river, thereby stop up the mouth of a river.Therefore Als content is controlled in 0.01～0.06% scope.
Ca:Ca both can deoxidation also can desulfurization, can cleaning molten steel, improve the purity of steel, make the MnS nodularization in the steel, the potential of performance material, Ca can increase C gathering partially at crystal boundary simultaneously, thereby reduce the poly-partially of S, effectively reduced the poly-partially impact Effect on Performance owing to S, Wei Liang calcium can stop harmful generation of organizing the Wei Shi body in addition, but during its too high levels, easily form thick non-metallic inclusion.So Ca content is controlled in 0.001～0.008% scope.
The present invention is by optimizing composition and production technique, yield tensile ratio is less than 0.8, grain fineness number 〉=6 grade, effectively improved the shock resistance of hot-rolled steel sheet pile as fixation means, be as shore protection, bulkhead wall and fixation means such as harbour, river, be particularly useful for the shockproof steel grade of fixed buildings, its production technique is simple, is beneficial to popularization.
Embodiment
Embodiment 1
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.12%, Mn 1.0%, Si 0.22%, P≤0.02%, S≤0.02%, Als 0.01%, V 0.02%, Ca 0.001%, all the other are Fe and unavoidable impurities.
The production yield tensile ratio is less than the method for 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1640～1650 ℃;
2) carry out converter refining: control its refining time at 30 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 60 kilograms of/ton steel;
3) when finishing preceding 5 minutes, converter refining begins to add the Al line according to 3 meters/ton steel;
4) when finishing preceding 2.5 minutes, converter refining begins to add the Si-Ca line according to 3 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 0.5%;
6) continuously cast bloom is heated to 1150～1165 ℃;
7) be rolled: control every time draft 10%, control roughing accumulative total draft is 50%, and control finish rolling accumulative total draft is 25%.
Embodiment 2
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.145%, Mn1.2%, Si 0.28%, P≤0.02%, S≤0.02%, Als 0.019%, V 0.093%, Ca 0.0025%, all the other are Fe and unavoidable impurities.
The production yield tensile ratio is less than the method for 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1650～1665 ℃;
2) carry out converter refining: control its refining time at 40 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 75 kilograms of/ton steel;
3) when finishing preceding 6.5 minutes, converter refining begins to add the Al line according to 4.5 meters/ton steel;
4) when finishing preceding 4 minutes, converter refining begins to add the Si-Ca line according to 5 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 1.5%;
6) continuously cast bloom is heated to 1170～1185 ℃;
7) be rolled: control every time draft 12%, control roughing accumulative total draft is 60%, and control finish rolling accumulative total draft is 30%.
Embodiment 3
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.165%, Mn1.45%, Si 0.36%, P≤0.02%, S≤0.02%, Als 0.038%, V 0.12%, Ca 0.0046%, all the other are Fe and unavoidable impurities.
The production yield tensile ratio is less than the method for 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1650～1660 ℃;
2) carry out converter refining: control its refining time at 50 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 93 kilograms of/ton steel;
3) when finishing preceding 7 minutes, converter refining begins to add the Al line according to 4.0 meters/ton steel;
4) when finishing preceding 5 minutes, converter refining begins to add the Si-Ca line according to 6.5 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 2.5%;
6) continuously cast bloom is heated to 1185～1200 ℃;
7) be rolled: control every time draft 15%, control roughing accumulative total draft is 70%, and control finish rolling accumulative total draft is 36%.
Embodiment 4
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.186%, Mn1.6%, Si 0.42%, P≤0.02%, S≤0.02%, Als 0.049%, V 0.156%, Ca 0.006%, all the other are Fe and unavoidable impurities.
The production yield tensile ratio is less than the method for 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1645～1650 ℃;
2) carry out converter refining: control its refining time at 48 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 110 kilograms of/ton steel;
3) when finishing preceding 8.5 minutes, converter refining begins to add the Al line according to 4.5 meters/ton steel;
4) when finishing preceding 6 minutes, converter refining begins to add the Si-Ca line according to 8 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 3.2%;
6) continuously cast bloom is heated to 1205～1220 ℃;
7) be rolled: control every time draft 18%, control roughing accumulative total draft is 75%, and control finish rolling accumulative total draft is 42%.
Embodiment 5
Yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.2%, Mn 1.8%, Si 0.5%, P≤0.02%, S≤0.02%, Als 0.06%, V 0.18%, Ca 0.008%, all the other are Fe and unavoidable impurities.
The production yield tensile ratio is less than the method for 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1650～1660 ℃;
2) carry out converter refining: control its refining time at 55 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 120 kg/ton steel;
3) when finishing preceding 10 minutes, converter refining begins to add the Al line according to 5 meters/ton steel;
4) when finishing preceding 7 minutes, converter refining begins to add the Si-Ca line according to 10 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 3.2%;
6) continuously cast bloom is heated to 1235～1250 ℃;
7) be rolled: control every time draft 20%, control roughing accumulative total draft is 80%, and control finish rolling accumulative total draft is 45%.
The product steel of the foregoing description after testing, its mechanical property the results are shown in following table 1
Table 1: the service check of product
| Embodiment | Yield tensile ratio (ReL/R m) | A(％) | Grain fineness number (level) |
| 1 | 0.62 | 30 | 8 |
| 2 | 0.68 | 25 | 6.5 |
| 3 | 0.65 | 28 | 7 |
| 4 | 0.70 | 26 | 7.5 |
| 5 | 0.71 | 24 | 7 |
Claims (2)
1. yield tensile ratio is less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its chemical ingredients and weight percent are: C 0.12～0.20%, Mn 1.0～1.8%, Si 0.22%, P≤0.02%, S≤0.02%, Als 0.06%, V 0.02～0.18%, Ca 0.006～0.008%, all the other are Fe and unavoidable impurities.
2. method of producing the described yield tensile ratio of claim 1 less than 0.8 steel for hot-rolled U-shaped steel sheet pile, its step:
1) smelts: control its tapping temperature at 1640～1650 ℃;
2) carry out converter refining: control its refining time at 30～55 minutes; When the beginning converter refining, add aluminum-manganese-iron alloy according to 60～120 kg/ton steel;
3) when finishing preceding 5～10 minutes, converter refining begins to add the Al line according to 3～5 meters/ton steel;
4) when finishing preceding 2.5～7 minutes, converter refining begins to add the Si-Ca line according to 3～10 meters/ton steel;
5) carry out continuous casting: the control pouring temperature is at 1575～1585 ℃, and induction stirring all the time; The dynamic draught of continuously cast bloom is 0.5～4%;
6) continuously cast bloom is heated to 1150～1250 ℃;
7) be rolled: control every time draft 10～20%, control roughing accumulative total draft is 50～80%, and control finish rolling accumulative total draft is 25～45%.
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| CN104018070B (en) * | 2014-06-18 | 2017-01-18 | 内蒙古包钢钢联股份有限公司 | Production method of flaw detection guaranteed thick S355J2 steel plate |
| CN107365944A (en) * | 2017-07-29 | 2017-11-21 | 华北理工大学 | Hot rolling U-shaped steel sheet pile and its manufacturing process |
| CN109576590A (en) * | 2019-01-23 | 2019-04-05 | 河北津西钢板桩型钢科技有限公司 | A kind of bending resistance U-shaped steel sheet pile and its manufacturing method |
| CN110512135A (en) * | 2019-09-23 | 2019-11-29 | 包头钢铁（集团）有限责任公司 | A kind of low yield strength ratio hot rolling U-shaped steel sheet pile and its manufacturing process |
| WO2022104676A1 (en) * | 2020-11-20 | 2022-05-27 | 何满潮 | Production method for npr new material slab by means of converter and continuous casting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033524A (en) * | 2007-04-16 | 2007-09-12 | 唐山钢铁股份有限公司 | Hot-rolled sheet strip steel for thread gluing resistant straight welding petroleum oil line and producing method thereof |
| CN101289728A (en) * | 2007-04-20 | 2008-10-22 | 宝山钢铁股份有限公司 | Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture |
| CN101403069A (en) * | 2008-11-13 | 2009-04-08 | 武汉钢铁(集团)公司 | Hot-rolled U shaped metal sheet pile and microalloying production method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858251A (en) * | 1981-10-05 | 1983-04-06 | Nippon Steel Corp | Steel pipe or steel sheet pile for covering with concrete |
| JP2007332414A (en) * | 2006-06-14 | 2007-12-27 | Jfe Steel Kk | High strength wide steel sheet pile and its production method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033524A (en) * | 2007-04-16 | 2007-09-12 | 唐山钢铁股份有限公司 | Hot-rolled sheet strip steel for thread gluing resistant straight welding petroleum oil line and producing method thereof |
| CN101289728A (en) * | 2007-04-20 | 2008-10-22 | 宝山钢铁股份有限公司 | Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture |
| CN101403069A (en) * | 2008-11-13 | 2009-04-08 | 武汉钢铁(集团)公司 | Hot-rolled U shaped metal sheet pile and microalloying production method |
Non-Patent Citations (2)
| Title |
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| JP特开2007-332414A 2007.12.27 |
| JP特开昭58-58251A 1983.04.06 |
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