CN110512135A - A kind of low yield strength ratio hot rolling U-shaped steel sheet pile and its manufacturing process - Google Patents
A kind of low yield strength ratio hot rolling U-shaped steel sheet pile and its manufacturing process Download PDFInfo
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- CN110512135A CN110512135A CN201910899501.0A CN201910899501A CN110512135A CN 110512135 A CN110512135 A CN 110512135A CN 201910899501 A CN201910899501 A CN 201910899501A CN 110512135 A CN110512135 A CN 110512135A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of low yield strength ratio hot rolling U-shaped steel sheet pile, the ingredient including following mass percent: C 0.15%-0.19%, Si 0.30%-0.45%, Mn 1.30%-1.45%, P≤0.025%, S≤0.020%, V 0.040%-0.050%, remaining is Fe and inevitable impurity.Its manufacturing process is also disclosed.The present invention prepares the hot rolling U-shaped steel sheet of quakeproof and quake-resistant fixed buildings of the yield tensile ratio less than 0.8, which has anti-lamellar tearing ability, and has preferable welding performance.
Description
Technical field
The present invention relates to the metal material field of metallurgical industry production more particularly to a kind of low yield strength ratio hot rolling U-shaped steel sheets
Stake and its manufacturing process, are antidetonation steel sheet piles for building.
Background technique
Steel sheet pile has many unique function and advantage, thus its purposes is very extensive, such as in permanent structure
In building, it can be used for harbour, unloading apron, levee revetment, revetment, shelves cob wall, breakwater, trraning pole, dock, gate etc.；In
On temporary structure object, it can be used for sealing a mountain pass, temporarily expansion bank, cutout, bridge construction cofferdam, large-scale pipeline are laid with the gear that interim irrigation canals and ditches excavate
Soil, water blocking, sand stop wall etc.；In flood-fighting, it can be used for controlling flood, anti-collapse, collapse, anti-drift sand etc..
Steel sheet pile is used as the fixation means in shore protection, bulkhead wall and harbour, river.Bingku county south has occurred in nineteen ninety-five, Japan
Portion's earthquake.In earthquake, various infrastructure receive serious damage, the equipment including harbour and river.Damage also becomes
Hereafter opportunity is subject to the people's attention in terms of the safety of antidetonation, steel sheet pile exists as fixation means in relation to infrastructure
It is not taken seriously in terms of anti-seismic performance.Therefore in order to improve the shock resistances of fixation means, it is desirable to hot-rolled steel sheet pile have compared with
Low yield tensile ratio.Under harsh deformation load, the plastic deformation consistency of hot-rolled steel sheet pile is crucial, and improves plastic deformation
The effective ways of performance are the yield tensile ratios for reducing steel.Yield tensile ratio is lower, and material is from plastic deformation is started to required for final fracture
Deformation quantity it is bigger, thus improve its plastic deformation ability, the stress generated by overload can be effectively relieved and concentrate, make to build
Component absorbs more seismic energy.Otherwise will lead to if yield tensile ratio is excessively high as local large deformation and caused by overload unstability.
From this angle, the yield tensile ratio the low safer, therefore developing low yield strength ratio hot-rolled steel sheet pile has been trend.
Steel plate is defined in the newest quasi- BSEN1993-5:2007 and American Standard A572/A572M-07 of hot rolled steel plate pile beacon in Europe
The indexs such as model, the tensile strength of steel sheet pile and the yield strength of stake.Nippon Standard J work 5A5528:2006 and China national mark
Quasi- GB/T20933-2007 has equally also been merely given as chemical component, cross section parameter, tensile strength and the surrender of hot-rolled steel sheet pile
The indexs such as intensity.
Summary of the invention
The object of the present invention is to provide a kind of low yield strength ratio hot rolling U-shaped steel sheet pile and its manufacturing process, and it is small to prepare yield tensile ratio
In the hot rolling U-shaped steel sheet of 0.8 quakeproof and quake-resistant fixed buildings, which has anti-lamellar tearing ability, and has
Preferable welding performance.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of low yield strength ratio hot rolling U-shaped steel sheet pile, a kind of low yield strength ratio hot rolling U-shaped steel sheet pile, which is characterized in that including such as
The ingredient of lower mass percent: C 0.15%-0.19%, Si 0.30%-0.45%, Mn1.30%-1.45%, P≤
0.025%, S≤0.020%, V 0.040%-0.050%, remaining is Fe and inevitable impurity.
Further, the ingredient including following mass percent: C 0.16%-0.17%, Si 0.33%-0.40%, Mn
1.35%-1.42%, P≤0.015%, S≤0.015%, V 0.043%-0.047%, remaining for Fe and inevitably it is miscellaneous
Matter.
Further, the ingredient including following mass percent: C 0.15%, Si 0.35%, Mn 1.38%, P
0.009%, S 0.008%, V 0.045%, remaining is Fe and inevitable impurity.
Further, the ingredient including following mass percent: C 0.19%, Si 0.41%, Mn 1.39%, P
0.010%, S 0.007%, V 0.042%, remaining is Fe and inevitable impurity.
Further, vanadium is matched using VN alloy.
A kind of manufacturing process of low yield strength ratio hot rolling U-shaped steel sheet pile, specific as follows:
1) raw material
Enter furnace molten iron: Si:0.3-0.7%, S < 0.050%, P < 0.130%, 1250 DEG C of temperature >, band quantity of slag <
0.5%；Active lime: CaO >=85%；Activity degree >=280ml；Ferroalloy: Si-Mn-Fe, Si-Fe, ferro-boron, silico-calcium core-spun yarn；
2) converter charge weight
Control is at 105 ± 2 tons, wherein 95 tons of molten iron, 10 ± 2 tons of pure steel scrap, and tap is controlled at 95 tons, so as in place at
Divide the processing stablized and refined；
3) converter is using double slag melting methods
Initial stage basicity of slag target is controlled by 1.5-2.0；Finishing slag basicity target: 2.5-3.0；Magnesia: about 8%；Target control
Smelting cycle 40-45min/ furnace processed；
4) it supplies oxygen
Work oxygen pressure: 0.70-0.95MPa；Flow: 16500-19000m3/h；
5) converter is re-blow operation (catch carbon 0.15≤C≤0.30) using high drawing, requires that depth rifle, (point blows 1 to big flow when point is blown
Flow is transferred to 18000 or more after minute), it is desirable that tapping carbon component has tapping and requires after point is blown once；
6) converter terminal Composition Control target
Terminal C >=0.06%；P≤0.025%；
7) converter ensures that C-T coordinates tapping
1590 DEG C of reference temperature > of tapping can be taken the circumstances into consideration to adjust according to tapping hole, packet condition, rhythm of production etc.；
To LF temperature (target) >=1550 DEG C；
8) tapping hole maintenance is good, is operated using double pushing off the slag, and the control of tapping time is forbidden slag, prevented in 3min or more
Rephosphorization is excessive, it is desirable that rephosphorization amount≤0.008%, converter tapping sample and refine sample in place it is poor≤0.003%；Operator must have
Whole pushing off the slag idea, for tapping, preceding the case where not blocking up clay plug, is sternly examined, and forbids slag；
9) Si-Mn-Fe is used, Si-Fe ladle has aluminium deoxidation alloying, and silicomanganese 1100KG, ferrosilicon 100KG is added in tapping,
Ferro-aluminum 50KG, granule lime 350kg；
10) tapping to 1/3 when be initially added into alloy, added before tapping 2/3, forbid to close ladle bottom blowing in tapping process
Argon, BOTTOM ARGON BLOWING pressure rest in 0.2~0.4Mpa；
11) ladle
Use magnesia carbon brick ladle；
12) converter finished product ingredient
C (%) >=0.15, Si (%) >=0.14, Mn (%) >=0.60；
13) ladle reaches LF station
It is powered and slag charge is added, as follows with reference to additional amount:
Lime: 2.5~3.5kg/t molten steel；
Fluorite: 1-2Kg/t, it can be according to slugging situation appropriate adjustment；
14) refining of LF furnace uses reference quantity according to the sulphur situation for carrying out steel
Ferro-aluminum: 0.2kg/t~0.3kg/t；
Or Si-Ca-Ba: 0.4kg/t~0.8kg/t is with carrying out deoxidation；
15) LF refining operation requires
Refining time (refining procedure starts charging energization slugging to the tapping process time) >=25 minutes；The white slag time is greater than
10 minutes, refine whole Argon；
16) it after composition adjustment, before soft blow, feeds silicon-calcium wire 1.5-2 meters/ton and (pays attention to silicone content control, ordinary circumstance
Under, 1.5 meters/ton of every feeding then increase by 0.01% silicone content of molten steel)；Soft blow argon 5 minutes or more after line feeding；
17) ensure Metal in Tundish liquid level: >=600mm, molding casting；
18) crystallizer protecting residue requires drying
The principle for sparing no effort to, adding less, uniformly adding is adhered to when adding covering slag, is forbidden the top of the slag rubescent, is kept black scoriform state, melt cinder
Layer should be maintained at 6~12mm；
19) liquidus curve is 1516 DEG C, and target superheat degree is≤30 DEG C；
20) heating furnace bringing-up section temperature, 1180~1250 DEG C of soaking section temperature, 1120~1200 DEG C of start rolling temperature；
21) roll: for reduction ratio 10%, it is 50% that control roughing, which adds up reduction ratio, per pass for control, and control finish rolling is accumulative
Reduction ratio is 25%.
Further, tundish ingredient sample must be taken by opening when pouring 2/3 big packet Metal Weight of weight, in this, as steel-making finished product
Sample；Crystallizer copper pipe internal soundness and spray system are had to check for before production, it is desirable that cooling uniform, it is ensured that continuous casting billet surface and interior
Portion's quality.
Further, continuous casting water distribution specific water and water distribution execute " middle cold water meter "；Strict implement send steel by furnace, rolls by furnace
System.
Compared with prior art, advantageous effects of the invention:
It ensure that stability, uniformity, the consistency of hot rolling U-shaped steel sheet pile performance, each element have carried out Narrow Composition Control,
The control of sulphur phosphorus content is stringent, and not only for yield tensile ratio less than 0.8, which has anti-lamellar tearing ability, and has preferable
Welding performance.
Specific embodiment
Embodiment 1
Component and weight percent contained by the present embodiment low yield strength ratio hot rolling U-shaped steel sheet pile are as follows: C 0.15%, Si
0.35%, Mn 1.38%, P 0.009%, S 0.008%, V 0.045% (VN alloy matches vanadium), remaining is Fe and can not keep away
The impurity exempted from.Its production process are as follows: blast-melted-molten iron pretreatment-converter top and bottom complex blowing smelting-LF external refining-square
Parison continuous casting-slab feeding-dephosphorization of step heating-furnace-high pressure water one time-BD cogging-CCS universal rolling-hot saw takes
Sample-step cooling bed cooling-aligning-shape, surface quality inspection-sawing.Key control parameter: (1) tapping temperature 1606
DEG C, tapping carbon content is 0.08%, and the phosphorus content of tapping is 0.O09%.(2) in refining procedure, refining time 27 minutes；It is white
The slag time 11 minutes, refine whole Argon.When starting converter refining, aluminum-manganese-iron alloy is added according to 60 kgs/tonne of steel；Turning
Al line is initially added into according to 3 meter/ton steel when furnace refining terminates first 5 minutes；At 2.5 minutes before converter refining terminates according to 3 meters/
Ton steel is initially added into Si-Ca line；The degree of superheat is 31 DEG C, average pull rate 1.1m/min.(4) during roll control, open rolling
1201 DEG C of temperature, 930 DEG C of finishing temperature, 75 DEG C of straightening temperature；Reduction ratio controls accumulative pressure in 10-30%% per pass for control
Lower rate is 55-70%.
Embodiment 2
Component and weight percent contained by the present embodiment low yield strength ratio hot rolling U-shaped steel sheet pile are as follows: C 0.19%, Si
0.41%, Mn 1.39%, P 0.010%, S 0.007%, V 0.042% (VN alloy matches vanadium), remaining is Fe and can not keep away
The impurity exempted from.Its production process are as follows: blast-melted-molten iron pretreatment-converter top and bottom complex blowing smelting-LF external refining-square
Parison continuous casting-slab feeding-dephosphorization of step heating-furnace-high pressure water one time-BD cogging-CCS universal rolling-hot saw takes
Sample-step cooling bed cooling-aligning-shape, surface quality inspection-sawing.Key control parameter: (1) tapping temperature 1600
DEG C, tapping carbon content is 0.07%, and the phosphorus content of tapping is 0.O07%.(2) in refining procedure, refining time 29 minutes；It is white
The slag time 12 minutes, refine whole Argon.When starting converter refining, aluminum-manganese-iron alloy is added according to 60 kgs/tonne of steel；Turning
Al line is initially added into according to 3 meter/ton steel when furnace refining terminates first 5 minutes；At 2.5 minutes before converter refining terminates according to 3 meters/
Ton steel is initially added into Si-Ca line；The degree of superheat is 29 DEG C, average pull rate 1.2m/min.(4) during roll control, open rolling
1182 DEG C of temperature, 934 DEG C of finishing temperature, 80 DEG C of straightening temperature；Reduction ratio controls accumulative pressure in 10-30%% per pass for control
Lower rate is 55-70%.
Properties of product of the invention are as shown in table 1 below:
Table 1
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (8)
1. a kind of low yield strength ratio hot rolling U-shaped steel sheet pile, which is characterized in that the ingredient including following mass percent: C 0.15%-
0.19%, Si 0.30%-0.45%, Mn 1.30%-1.45%, P≤0.025%, S≤0.020%, V 0.040%-
0.050%, remaining is Fe and inevitable impurity.
2. low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 1, which is characterized in that including following mass percent
Ingredient: C 0.16%-0.17%, Si 0.33%-0.40%, Mn 1.35%-1.42%, P≤0.015%, S≤
0.015%, V 0.043%-0.047%, remaining is Fe and inevitable impurity.
3. low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 1, which is characterized in that including following mass percent
Ingredient: C 0.15%, Si 0.35%, Mn 1.38%, P 0.009%, S 0.008%, V 0.045%, remaining for Fe and
Inevitable impurity.
4. low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 1, which is characterized in that including following mass percent
Ingredient: C 0.19%, Si 0.41%, Mn 1.39%, P 0.010%, S 0.007%, V 0.042%, remaining for Fe and
Inevitable impurity.
5. low yield strength ratio hot rolling U-shaped steel sheet pile according to any one of claims 1 to 4, which is characterized in that use vanadium nitrogen
Alloy matches vanadium.
6. the manufacturing process of low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 1, which is characterized in that specific as follows:
1) raw material
Enter furnace molten iron: Si:0.3-0.7%, S < 0.050%, P < 0.130%, 1250 DEG C of temperature >, band quantity of slag < 0.5%；It is living
Property lime: CaO >=85%；Activity degree >=280ml；Ferroalloy: Si-Mn-Fe, Si-Fe, ferro-boron, silico-calcium core-spun yarn；
2) converter charge weight
Control is at 105 ± 2 tons, and wherein 95 tons of molten iron, 10 ± 2 tons of pure steel scrap, tap are controlled at 95 tons, so that ingredient in place is steady
Fixed and refining processing；
3) converter is using double slag melting methods
Initial stage basicity of slag target is controlled by 1.5-2.0；Finishing slag basicity target: 2.5-3.0；Magnesia: 8%；Target control is smelted
Period 40-45min/ furnace；
4) it supplies oxygen
Work oxygen pressure: 0.70-0.95MPa；Flow: 16500-19000m3/h；
5) converter draws operation of re-blowing using high, and deep rifle, big flow are required when point is blown, it is desirable that tapping carbon component has after point is blown once
Tapping requires；
6) converter terminal Composition Control target
Terminal C >=0.06%；P≤0.025%；
7) converter ensures that C-T coordinates tapping
1590 DEG C of reference temperature > of tapping can be taken the circumstances into consideration to adjust according to tapping hole, packet condition, rhythm of production etc.；
To temperature >=1550 DEG C LF；
8) tapping hole maintenance is good, is operated using double pushing off the slag, and the control of tapping time forbids slag, prevent rephosphorization in 3min or more
It is excessive, it is desirable that rephosphorization amount≤0.008%, converter tapping sample and refine sample in place it is poor≤0.003%；
9) Si-Mn-Fe is used, Si-Fe ladle has aluminium deoxidation alloying, and silicomanganese 1100KG, ferrosilicon 100KG, ferro-aluminum is added in tapping
50KG, granule lime 350kg；
10) tapping to 1/3 when be initially added into alloy, added before tapping 2/3, forbid to close steel ladle bottom argon blowing, bottom in tapping process
Argon pressure rests in 0.2~0.4Mpa；
11) ladle
Use magnesia carbon brick ladle；
12) converter finished product ingredient
C >=0.15%, Si >=0.14%, Mn >=0.60%；
13) ladle reaches LF station
It is powered and slag charge is added, as follows with reference to additional amount:
Lime: 2.5~3.5kg/t molten steel；
Fluorite: 1-2Kg/t, it can be according to slugging situation appropriate adjustment；
14) refining of LF furnace uses reference quantity according to the sulphur situation for carrying out steel
Ferro-aluminum: 0.2kg/t~0.3kg/t；
Or Si-Ca-Ba: 0.4kg/t~0.8kg/t is with carrying out deoxidation；
15) LF refining operation requires
Refining time >=25 minute；The white slag time is greater than 10 minutes, refines whole Argon；
16) after composition adjustment, before soft blow, silicon-calcium wire 1.5-2 meters/ton is fed；Soft blow argon 5 minutes or more after line feeding；
17) ensure Metal in Tundish liquid level: >=600mm, molding casting；
18) crystallizer protecting residue requires drying
The principle for sparing no effort to, adding less, uniformly adding is adhered to when adding covering slag, is forbidden the top of the slag rubescent, is kept black scoriform state, liquid slag layer is answered
It is maintained at 6~12mm；
19) liquidus curve is 1516 DEG C, and target superheat degree is≤30 DEG C；
20) heating furnace bringing-up section temperature, 1180~1250 DEG C of soaking section temperature, 1120~1200 DEG C of start rolling temperature；
21) roll: for reduction ratio 10%, it is 50% that control roughing, which adds up reduction ratio, per pass for control, the accumulative pressure of control finish rolling
Rate is 25%.
7. the manufacturing process of low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 6, which is characterized in that open and pour weight
Tundish ingredient sample must be taken when 2/3 big packet Metal Weight, in this, as steel-making finished product sample；Crystallizer copper is had to check for before production
Pipe internal soundness and spray system, it is desirable that cooling uniform, it is ensured that continuous casting billet surface and internal soundness.
8. the manufacturing process of low yield strength ratio hot rolling U-shaped steel sheet pile according to claim 6, which is characterized in that continuous casting water distribution
Specific water and water distribution execute " middle cold water meter "；Strict implement send steel by furnace, rolls by furnace.
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| 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 |
| 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 |
| CN102041434A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Steel plate for low-alloy high-strength structured steel Q460E-Z35 and production method thereof |
-
2019
- 2019-09-23 CN CN201910899501.0A patent/CN110512135A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN101818306A (en) * | 2010-04-30 | 2010-09-01 | 武汉钢铁(集团)公司 | Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and manufacture method thereof |
| CN102041434A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Steel plate for low-alloy high-strength structured steel Q460E-Z35 and production method thereof |
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Application publication date: 20191129 |