CN109576590A - A kind of bending resistance U-shaped steel sheet pile and its manufacturing method - Google Patents
A kind of bending resistance U-shaped steel sheet pile and its manufacturing method Download PDFInfo
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The present invention relates to technical field of ferrous metallurgy, specifically disclose a kind of bending resistance U-shaped steel sheet pile and its manufacturing method.The chemical component of the bending resistance U-shaped steel sheet pile includes: C:0.21~0.30% by weight percentage；Si:0.20~0.80%；Mn:1.20~1.70%；P < 0.05%；S < 0.03%；Nb:0.015~0.035%；Surplus is Fe and inevitable impurity.Bending resistance U-shaped steel sheet pile provided by the invention, by regulating and controlling C, Mn content, control carbon equivalent Ceq in the reasonable scope, and pass through Nb microalloying and finish-rolling process cooperation control steel grain size, steel sheet pile yield strength is set to be greater than 420MPa, room temperature impact function is greater than 34J, and anti-bending strength is significantly improved, effectively prolongs its service life.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy more particularly to a kind of bending resistance U-shaped steel sheet pile and its manufacturing methods.
Background technique
Steel sheet pile has that cold bending thin wall is light-duty and hot rolling type, since the former has biggish processing, using limitation, thus,
Hot-rolled steel sheet pile becomes the mainstream of steel sheet pile product development.The purposes of hot-rolled steel sheet pile is very extensive, in permanent construction structure
On, it can be used for harbour, unloading apron, levee revetment, revetment, retaining wall, breakwater, gate etc.；It, can in temporary building structure
For sealing a mountain pass, temporarily expand bank, cutout, bridge construction cofferdam, the earth-retaining that large-scale pipeline is laid with, interim irrigation canals and ditches excavate, water blocking, shelves sand wall
Deng；In flood-fighting, it can be used for controlling flood, anti-collapse, collapse, anti-drift sand etc..
Steel sheet pile is in practical application, on the one hand, under pile driving resistance effect, pile body will appear curved during piling
Song, geological conditions is harder, and the bending of pile body is more serious；On the other hand, cofferdam pile body is also bent by earth pressure at rest effect, is enclosed
Weir depth is deeper, and pile body is longer, bigger by earth pressure at rest, is more easily bent.The bending of steel sheet pile pile body is more than certain range,
Steel sheet pile just can not be used again and scrap, and therefore, the anti-bending strength of steel sheet pile use process has weight for its service life
It influences, in fact, also indicating that the bending of steel sheet pile is the main original for causing steel sheet pile to scrap by a large amount of user investigation
Cause.
In the prior art also it is paid use V alloyization improve intensity, the report of the anti-bending strength of Lai Gaishan steel sheet pile, but
What it was improved is mostly tensile strength, can not be effectively improved the anti-bending strength of steel sheet pile, and production cost is higher.Largely answer
With it was verified that either in piling process or cofferdam use process, the intensity of steel sheet pile can all be generated very anti-bending strength
Big influence, and intensity here is mainly yield strength, therefore, keeping high yield strength is to improve steel sheet pile anti-bending strength
Important channel.However, still fresh come the correlative study for improving its anti-bending strength about the yield strength by improving steel sheet pile
It has been reported that, most steel sheet piles is caused to still have the problem that anti-bending strength is poor, service life is short.
Summary of the invention
For the problems such as anti-bending strength existing for existing steel sheet pile is poor, service life is short, high production cost, the present invention is provided
A kind of bending resistance U-shaped steel sheet pile and its manufacturing method.
To achieve the above object of the invention, the embodiment of the present invention uses the following technical solution:
A kind of bending resistance U-shaped steel sheet pile, the chemical component of the U-shaped steel sheet pile include: by weight percentage C:0.21~
0.30%；Si:0.20~0.80%；Mn:1.20~1.70%；P < 0.05%；S < 0.03%；Nb:0.015~0.035%；It is remaining
Amount is Fe and inevitable impurity.
Further, the chemical component of the U-shaped steel sheet pile includes: C:0.21~0.27% by weight percentage；Si:
0.20~0.80%；Mn:1.30~1.60%；0P < 0.05%；S < 0.03%；Nb:0.02~0.03%；Surplus is for Fe and not
It can avoid impurity.
Further, carbon equivalent Ceq is 0.45~0.52, wherein Ceq=C%+Mn%/6.
Further, the lock angle of rotation of the steel sheet pile is 10~18 DEG C, reduces the frictional force latched during piling,
Keep piling process smooth, further improves the anti-bending strength of steel sheet pile.
Specifically, in U-shaped steel sheet pile each element effect:
C is the most effective element for improving steel material surrender and tensile strength, with the raising of C content, the intensity of material
It is significantly improved, but the too high toughness that can reduce product of C content, so C will have percentage composition appropriate；
Mn is also the effective element for improving steel material surrender and tensile strength, while improving toughness, Mn usually and C together
Determine carbon equivalent, to determine the yield strength of material, wherein carbon equivalent Ceq=C%+Mn%/6；
Nb plays the role of refined crystalline strengthening in steel material, while improving intensity, improves toughness.Compared to V, Nb's is strong
It is more preferable to change effect, it is also more economical.But Nb microalloying is very high for the control requirement of technique, for this purpose, Nb microalloying approach needs
Formulate the control of stringent process control needs, especially finishing temperature.The present invention claims finishing temperature control 880 DEG C with
Under, it is ensured that the strengthening effect of Nb makes grain size at 9~11 grades；
P is considered as harmful element in steel, should try to control more lower better；
S and Mn are combined and are formed MnS field trash, influence the toughness and corrosion resisting property of product, therefore it is required that control S content compared with
Low level.
Compared with the existing technology, bending resistance U-shaped steel sheet pile provided by the invention controls carbon equivalent by regulating and controlling C, Mn content
Ceq in the reasonable scope, while improving steel sheet pile yield strength and tensile strength, improves the toughness of steel sheet pile；And pass through Nb
Microalloying and finish-rolling process cooperation control steel grain size, while reducing cost, further improve and improve steel sheet pile
Intensity and toughness, so that steel sheet pile yield strength is greater than 420MPa, room temperature impact function is greater than 34J, and anti-bending strength significantly mentioned
Height effectively prolongs its service life.
The present invention also provides the preparation methods of above-mentioned U-shaped steel sheet pile, comprising the following steps: converter smelting, LF refining, company
Casting, cogging, finish rolling, aligning and sawing, wherein finish rolling start rolling temperature is 950~980 DEG C, and finishing temperature is 860~890 DEG C, essence
Roll reduction ratio >=40%.
Specifically, using lower finish rolling start rolling temperature and finishing temperature, higher finish rolling drafts makes austenite structure
It is sufficiently broken, in addition the pinning effect of NbC precipitated phase, hinders crystal grain to grow up, so that very tiny crystal grain is obtained after rolling, it is brilliant
Grain can control at 9~11 grades, tiny crystal grain helps to improve and improves the intensity and toughness of steel sheet pile, especially with
Ceq collective effect improves the yield strength of steel, improves the bending resistance of steel sheet pile.
Further, deoxidation treatment is carried out in the converter steelmaking process, oxygen content≤50ppm, total [O] content is got in steel
Low, the content of field trash is lower, facilitates the toughness for improving steel sheet pile.
Further, Al deoxidation is used in the deoxidation treatment.
Further, argon gas stirring is carried out during the LF refining, mixing time 10-20min is conducive to molten steel
Deoxidation, desulphurization reaction carry out, and facilitate the exclusion of pernicious gas and field trash.
Further, argon flow is 25-35L/min in the argon gas stirring, guarantees well stable mixing effect.
Further, before cogging processing, continuous casting billet is heated, heating time 120-150min makes green body
Temperature is 1080-1120 DEG C, longer heating and soaking time, it is ensured that Nb is sufficiently dissolved in austenite structure, and ingredient is uniform,
Facilitate subsequent cogging simultaneously, finish rolling is gone on smoothly.
Compared with the existing technology, the preparation method of U-shaped steel sheet pile provided by the invention, process is simple, low in cost, passes through
Converter smelting, LF refining and continuous casting obtain continuous casting billet, after heat-treated, are matched by Nb microalloying and cogging, finish-rolling process
The angle of rotation angle for closing control steel grain size and steel sheet pile lock, while improving and improve the intensity and toughness of steel sheet pile,
Reduce the frictional force latched during piling, improves the anti-bending strength of steel sheet pile.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
The chemical component of a kind of bending resistance U-shaped steel sheet pile, the U-shaped steel sheet pile includes: C:0.25% by weight percentage；
Si:0.25%；Mn:1.40%；P:0.03%；S:0.006%；Nb:0.025%；Surplus is Fe and inevitable impurity.
The preparation method of above-mentioned U-shaped steel sheet pile, comprising the following steps:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing,
Converter smelting is used by blast-melted, using Al deoxidation, control molten steel total oxygen content is 42ppm, LF refining is carried out,
12min is stirred with the argon gas of 35L/min, molten steel obtains continuous casting billet by continuous casting processing after refining, and continuous casting billet is carried out at heating
130min is managed, makes 1080 DEG C of green body temperature, after cogging is handled, in 980 DEG C of progress finish rolling processing, finish rolling reduction ratio is
45%, finishing temperature control is aligned at 885 DEG C and after sawing, obtains the U-shaped steel sheet pile that lock angle of rotation is 10 DEG C.
Embodiment 2
The chemical component of a kind of bending resistance U-shaped steel sheet pile, the U-shaped steel sheet pile includes: C:0.21% by weight percentage；
Si:0.35%；Mn:1.70%；P:0.023%；S:0.006%；Nb:0.015%；Surplus is Fe and inevitable impurity.
The preparation method of above-mentioned U-shaped steel sheet pile, comprising the following steps:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing,
Converter smelting is used by blast-melted, using Al deoxidation, control molten steel total oxygen content is 40ppm, LF refining is carried out,
15min is stirred with the argon gas of 30L/min, molten steel obtains continuous casting billet by continuous casting processing after refining, and continuous casting billet is carried out at heating
123min is managed, makes 1090 DEG C of green body temperature, after cogging is handled, in 970 DEG C of progress finish rolling processing, finish rolling reduction ratio is
43%, finishing temperature control is aligned at 865 DEG C and after sawing, obtains the U-shaped steel sheet pile that lock angle of rotation is 15 DEG C.
Embodiment 3
The chemical component of a kind of bending resistance U-shaped steel sheet pile, the U-shaped steel sheet pile includes: C:0.30% by weight percentage；
Si:0.30%；Mn:1.20%；P:0.019%；S:0.003%；Nb:0.030%；Surplus is Fe and inevitable impurity.
The preparation method of above-mentioned U-shaped steel sheet pile, comprising the following steps:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing,
Converter smelting is used by blast-melted, using Al deoxidation, control molten steel total oxygen content is 36ppm, LF refining is carried out,
11min is stirred with the argon gas of 35L/min, molten steel obtains continuous casting billet by continuous casting processing after refining, and continuous casting billet is carried out at heating
120min is managed, makes 1120 DEG C of green body temperature, after cogging is handled, in 962 DEG C of progress finish rolling processing, finish rolling reduction ratio is
40%, finishing temperature control is aligned at 861 DEG C and after sawing, obtains the U-shaped steel sheet pile that lock angle of rotation is 18 DEG C.
Embodiment 4
The chemical component of a kind of bending resistance U-shaped steel sheet pile, the U-shaped steel sheet pile includes: C:0.23% by weight percentage；
Si:0.40%；Mn:1.32%；P:0.025%；S:0.004%；Nb:0.027%；Surplus is Fe and inevitable impurity.
The preparation method of above-mentioned U-shaped steel sheet pile, comprising the following steps:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing,
Converter smelting is used by blast-melted, using Al deoxidation, control molten steel total oxygen content is 48ppm, LF refining is carried out,
18min is stirred with the argon gas of 25L/min, molten steel obtains continuous casting billet by continuous casting processing after refining, and continuous casting billet is carried out at heating
140min is managed, makes 1118 DEG C of green body temperature, after cogging is handled, in 970 DEG C of progress finish rolling processing, finish rolling reduction ratio is
42%, finishing temperature control is aligned at 871 DEG C and after sawing, obtains the U-shaped steel sheet pile that lock angle of rotation is 16 DEG C.
Embodiment 5
The chemical component of a kind of bending resistance U-shaped steel sheet pile, the U-shaped steel sheet pile includes: C:0.27% by weight percentage；
Si:0.31%；Mn:1.60%；P:0.028%；S:0.003%；Nb:0.020%；Surplus is Fe and inevitable impurity.
The preparation method of above-mentioned U-shaped steel sheet pile, comprising the following steps:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing,
Converter smelting is used by blast-melted, using Al deoxidation, control molten steel total oxygen content is 43ppm, LF refining is carried out,
12min is stirred with the argon gas of 28L/min, molten steel obtains continuous casting billet by continuous casting processing after refining, and continuous casting billet is carried out at heating
128min is managed, makes 1095 DEG C of green body temperature, after cogging is handled, in 978 DEG C of progress finish rolling processing, finish rolling reduction ratio is
43%, finishing temperature control is aligned at 877 DEG C and after sawing, obtains the U-shaped steel sheet pile that lock angle of rotation is 12 DEG C.
The characteristic for the U-shaped steel sheet pile that embodiment provides in order to better illustrate the present invention, below prepares embodiment 1-5
U-shaped steel sheet pile carries out the test of respective performances, and the results are shown in Table 1.
Table 1
Wherein, anti-bending strength is obtained by driving test, chooses specification 400x170mm, and the stake of cut lengths 12m uses
Reciprocal plug measures the curvature (pile body is bent maximum point to the distance of pile body line end to end) of pile body, and and Imported High-performance
Stake is compared.
It can be obtained by above data, U-shaped steel sheet pile provided in an embodiment of the present invention, yield strength > 440MPa, tensile strength
> 620MPa, ballistic work > 53J have excellent anti-bending strength.The steel sheet pile can be used harder in geology, and plug is frequent
Condition, especially for cofferdam depth be greater than 12m the case where.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of bending resistance U-shaped steel sheet pile, it is characterised in that: the chemical component of the U-shaped steel sheet pile includes: by weight percentage
C:0.21~0.30%；Si:0.20~0.80%；Mn:1.20~1.70%；P < 0.05%；S < 0.03%；Nb:0.015~
0.035%；Surplus is Fe and inevitable impurity.
2. bending resistance U-shaped steel sheet pile as described in claim 1, it is characterised in that: the chemical component of the U-shaped steel sheet pile is with weight
Percentages include: C:0.21~0.27%；Si:0.20~0.80%；Mn:1.30~1.60%；0P < 0.05%；S<
0.03%；Nb:0.02~0.03%；Surplus is Fe and inevitable impurity.
3. bending resistance U-shaped steel sheet pile as described in claim 1, it is characterised in that: carbon equivalent Ceq is 0.45~0.52, wherein Ceq
=C%+Mn%/6.
4. bending resistance U-shaped steel sheet pile as described in claim 1, it is characterised in that: the lock angle of rotation of the steel sheet pile be 10~
18℃。
5. the preparation method of the described in any item bending resistance U-shaped steel sheet piles of claim 1-4, it is characterised in that: the following steps are included:
Converter smelting, LF refining, continuous casting, cogging, finish rolling, aligning and sawing, wherein finish rolling start rolling temperature is 950~980 DEG C, finish to gauge
Temperature is 860~890 DEG C, finish rolling reduction ratio >=40%.
6. the preparation method of bending resistance U-shaped steel sheet pile as claimed in claim 5, it is characterised in that: in the converter steelmaking process
Carry out deoxidation treatment, oxygen content≤50ppm.
7. the preparation method of bending resistance U-shaped steel sheet pile as claimed in claim 6, it is characterised in that: used in the deoxidation treatment
Al deoxidation.
8. the preparation method of bending resistance U-shaped steel sheet pile as claimed in claim 5, it is characterised in that: during the LF refining into
The stirring of row argon gas, mixing time 10-20min.
9. the preparation method of bending resistance U-shaped steel sheet pile as claimed in claim 8, it is characterised in that: argon gas in the argon gas stirring
Flow is 25-35L/min.
10. the preparation method of bending resistance U-shaped steel sheet pile as claimed in claim 5, it is characterised in that: before cogging processing, to continuous casting
Base is heated, and heating time 120-150min makes 1080-1120 DEG C of green body temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155037A (en) * | 2020-02-13 | 2020-05-15 | 辽宁科技大学 | Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering |
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| CN101845587A (en) * | 2010-04-09 | 2010-09-29 | 武汉钢铁(集团)公司 | Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof |
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| JPS5252129A (en) * | 1975-10-25 | 1977-04-26 | Nippon Steel Corp | Method of preventing uusteel sheet pile from cracking |
| JPH08269622A (en) * | 1995-03-30 | 1996-10-15 | Nippon Steel Corp | Steel sheet pile excellent in weldability |
| 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 |
| CN101838768A (en) * | 2010-04-09 | 2010-09-22 | 武汉钢铁(集团)公司 | Low-temperature impact resistant steel for hot-rolling U-type steel sheet pile and production method thereof |
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| CN111155037A (en) * | 2020-02-13 | 2020-05-15 | 辽宁科技大学 | Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering |
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