CN110484822A - A kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof - Google Patents

A kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof Download PDF

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Publication number
CN110484822A
CN110484822A CN201910898930.6A CN201910898930A CN110484822A CN 110484822 A CN110484822 A CN 110484822A CN 201910898930 A CN201910898930 A CN 201910898930A CN 110484822 A CN110484822 A CN 110484822A
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CN
China
Prior art keywords
rolling
piling bar
strength thick
thick hot
temperature
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Pending
Application number
CN201910898930.6A
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Chinese (zh)
Inventor
冯岩青
卜向东
涛雅
达来
卢雄慧
宋振东
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Priority to CN201910898930.6A priority Critical patent/CN110484822A/en
Publication of CN110484822A publication Critical patent/CN110484822A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/088—H- or I-sections
    • 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
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a kind of high-strength thick hot-rolling H-shaped piling bar, the ingredient including following mass percent: C 0.17%-0.19%, Si≤0.55%, Mn 1.45%-1.55%, P≤0.015%, S≤0.015%, V 0.10-0.13%, N≤0.025, remaining is Fe and inevitable impurity.Preparation method is also disclosed.High-strength thick hot-rolling H-shaped piling bar of the invention has heavy wall, high intensity, the characteristic of high tenacity.

Description

A kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof
Technical field
The present invention relates to the metal material field of metallurgical industry production more particularly to a kind of high-strength thick are hot rolled H-shaped Stake and preparation method thereof, is a kind of 450MPa grades of hot-rolling H-shaped piling bars of high nitrogen high-strength thick.
Background technique
High-strength thick H profile steel stake is mainly used for making multistory frame column, portal frame column and platform column etc., is bearing Local stability section is formed in a manner of splicing and combining in heavy load pile structure, to ensure whole high-intensitive, high rigidity work The needs of journey.Building construction system, the system of deep foundation pit support of shallow sea and marshland are mainly used in its structure made Deng Gong China Democratic National Construction Association field.
As Urban Building Construction space is increasingly narrow, deep basal pit H profile steel support system is rapidly developed.Build high building Mansion design of deep foundation pit, construction, the requirement to high-intensitive piling bar steel construction are also higher and higher.
Summary of the invention
The object of the present invention is to provide a kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof, the steel have heavy wall, High-intensitive, high tenacity characteristic.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of high-strength thick hot-rolling H-shaped piling bar, the ingredient including following mass percent: C 0.17%-0.19%, Si ≤ 0.55%, Mn 1.45%-1.55%, P≤0.015%, S≤0.015%, V 0.10-0.13%, N≤0.025, remaining is Fe and inevitable impurity.
Further, the ingredient including following mass percent: C 0.17%, Si 0.45%, Mn 1.45%, P 0.008%, S 0.008%, V 0.12%, N 0.014%, remaining is Fe and inevitable impurity.
Further, the ingredient including following mass percent: C 0.19%, Si 0.43%, Mn 1.48%, P 0.007%, S 0.010%, 0.13%, N 0.0145%, remaining is Fe and inevitable impurity.
Further, addition VN16 alloy matches vanadium.
A kind of preparation method of high-strength thick hot-rolling H-shaped piling bar, comprising:
1) smelting condition
Raw materials and alloy material will comply with standard prescribed requirement, molten iron pretreatment, desulfurizing iron processing, it is desirable that and P≤ 0.120%.
2) converter
Terminal point control target value: C >=0.06%, P < 0.020%, temperature >=1640 DEG C；It is closed using silicomanganese and manganese-ferro deoxidation Aurification has aluminium final deoxidizing, pushing off the slag of tapping；
3) it refines
White slag operation is refined, whole to carry out blowing Ar operation by refining regulation, the soft blow time is greater than 8 minutes；
4) continuous casting
TL=1509 DEG C of liquidus temperature, molten steel overheat: Δ T≤35 DEG C, target Δ T≤30 DEG C are grasped using permanent pulling rate Make；
5) hot rolling
High-strength 880-930 DEG C of piling bar finishing temperature；High-pressure water descaling.
Further, it is described 3) in desulfurization, trimming and warming temperature carried out according to converter molten steel ingredient and temperature.
Further, finished product piling bar web thickness is 30mm-44mm.
Compared with prior art, advantageous effects of the invention:
Steel of the invention has heavy wall, high intensity, the characteristic of high tenacity；
High nitrogen steel: low-temperature flexibility ([N]: 100ppm-200ppm) in also meeting while having high-strength has good strong Toughness matching, overcomes the matched difficult point of good obdurability.Think gauge: overcome " using BB2 base type, compression ratio is only 36%, The compression ratio of slab to finished product is minimum, and the leg tip of piling bar is difficult to full of metal " difficult point.
Specific embodiment
A kind of high-strength thick hot-rolling H-shaped piling bar, the mass fraction of the mass fraction 0.17%-0.19%, Si of C≤ Mass fraction≤0.015%, V of mass fraction≤0.015%, S of the mass fraction 1.45%-1.55%, P of 0.55%, Mn Mass fraction 0.10-0.13%, N≤0.025, addition VN16 alloy match vanadium, remaining be Fe and inevitable impurity.
CEV≤0.47 when carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, t2≤30mm；30mm < t2 CEV≤0.49 when≤40mm；CEV≤0.49 when t2 > 40mm, wherein t2 is piling bar wing plate thickness.
Mechanical property specific requirement is shown in Table 1.
Table 1
The present invention relates to the production technologies of 2 kinds of heavy wall specifications, are shown in Table 2.
Table 2
Process route
Process for making: blast-melted-molten iron pretreatment-converter top and bottom complex blowing smelting-LF external refining-Hot Metal in Beam Blank connects Casting；
Steel rolling process: the feeding-dephosphorization of step heating-furnace-high pressure water one time-BD-CCS universal rolling-hot saw takes Sample-step cooling bed cooling-aligning-shape, surface quality inspection-sawing-packing-storage, outgoing.
It is specific as follows:
1) smelting condition
Raw materials and alloy material will comply with standard prescribed requirement, molten iron pretreatment, desulfurizing iron processing, it is desirable that and P≤ 0.120%.
2) converter
Terminal point control target value is shown in Table 3.Using silicomanganese and Fe-al-mn Deoxidizing, there is aluminium final deoxidizing, pushing off the slag of tapping.
Table 3
3) it refines
White slag operation is refined, whole to carry out blowing Ar operation by refining regulation, the soft blow time is greater than 8 minutes.According to converter steel Water constituent and temperature carry out desulfurization, trimming and warming temperature.
Refining is shown in 4 for casting machine component requirements.
4 unit of table: %
C Si Mn P S V
0.18 0.52 1.52 ≤0.015 ≤0.015 0.125
4) continuous casting
TL=1509 DEG C of liquidus temperature, molten steel overheat: Δ T≤35 DEG C, target Δ T≤30 DEG C are grasped using permanent pulling rate Make.
5) hot rolling
5.1) heating furnace
High-strength 880-930 DEG C of piling bar finishing temperature.
5.2) high-pressure water descaling is carried out.
Execute the inspection rule of Q/BG 526-2015 continuous casting special-shaped base.
6) non-metallic inclusion
The non-metallic inclusion grading of steel executes GB/T10561-2005, is shown in Table 5.
5 unit grade of table
A B C D Ds
≤1.5 ≤1.5 ≤1.5 ≤2.0 ≤2.0
Embodiment 1
The contained component and weight percent of the present embodiment high-strength thick hot-rolling H-shaped piling bar are as follows: the mass fraction of C The mass fraction 0.45% of 0.17%, Si, the mass fraction 1.45% of Mn, the mass fraction 0.008% of P, the mass fraction of S The mass fraction 0.12% of 0.008%, V, the mass fraction 0.014% of N, addition VN16 alloy match vanadium, remaining is Fe and can not The impurity avoided.
Specification is UBP305 × 305 × 223, and production process are as follows: process for making: blast-melted-molten iron pretreatment-turns Furnace top and bottom complex blowing smelting-LF external refining-casting for shaped blank continuous.Steel rolling process: feeding-step heating-furnace-high pressure water is primary Dephosphorization-BD-CCS universal rolling-hot saw sampling-step cooling bed cooling-aligning-shape, surface quality inspection-saw It cut-be packaged-is put in storage, outgoing.Key control parameter: (1) 1608 DEG C of tapping temperature, 1539 DEG C of middle packet thermometric, 1537 DEG C, 1533 DEG C, degree of superheat △ T=27 DEG C, average pull rate 0.85m/min, three streams draw steel.1151-1167 DEG C of start rolling temperature, BD1 roll-force 3012 Ns, sky crosses BD2, BBS Rolling With Universal Mill end type.The finishing temperature of 8 finished products of METHOD FOR CONTINUOUS DETERMINATION is 912 DEG C, 895 respectively ℃、896℃、920℃、916℃、902℃、922℃、900℃。
Embodiment 2
The contained component and weight percent of the present embodiment high-strength thick hot-rolling H-shaped piling bar are as follows: the mass fraction of C The mass fraction 0.43% of 0.19%, Si, the mass fraction 1.48% of Mn, the mass fraction 0.007% of P, the mass fraction of S The mass fraction 0.13% of 0.010%, V, the mass fraction 0.0145% of N, addition VN16 alloy match vanadium, remaining is Fe and can not The impurity avoided.
Specification is UC305 × 305 × 283, and production process are as follows: process for making: blast-melted-molten iron pretreatment-turns Furnace top and bottom complex blowing smelting-LF external refining-casting for shaped blank continuous.Steel rolling process: feeding-step heating-furnace-high pressure water is primary Dephosphorization-BD-CCS universal rolling-hot saw sampling-step cooling bed cooling-aligning-shape, surface quality inspection-saw It cut-be packaged-is put in storage, outgoing.Key control parameter: (1) 1600 DEG C of tapping temperature, 1540 DEG C of middle packet thermometric, 1541 DEG C, 1542 DEG C, degree of superheat △ T=27 DEG C, average pull rate 0.80m/min, three streams draw steel.1155-1180 DEG C of start rolling temperature, BD1 roll-force 3082 Ns, sky crosses BD2, and BBS Rolling With Universal Mill end type, the finishing temperature of 8 finished products of METHOD FOR CONTINUOUS DETERMINATION is 932 DEG C, 935 respectively ℃、896℃、920℃、936℃、912℃、902℃、909℃。
The properties of product of the embodiment of the present invention
The mirco structure of the embodiment of the present invention
Of the invention focuses on overcoming following two difficult points:
High nitrogen steel: low-temperature flexibility ([N]: 100ppm-200ppm) in also meeting while having high-strength, difficult point is good Eager to do well in everything toughness matching.
Think gauge: difficult point is that compression ratio is only 36%, and the compression ratio of slab to finished product is minimum, piling bar using BB2 base type Leg tip be difficult to full of metal.
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 (7)

1. a kind of high-strength thick hot-rolling H-shaped piling bar, which is characterized in that the ingredient including following mass percent: C 0.17%- 0.19%, Si≤0.55%, Mn 1.45%-1.55%, P≤0.015%, S≤0.015%, V 0.10-0.13%, N≤ 0.025, remaining is Fe and inevitable impurity.
2. high-strength thick hot-rolling H-shaped piling bar according to claim 1, which is characterized in that including following mass percent Ingredient: C 0.17%, Si 0.45%, Mn 1.45%, P 0.008%, S 0.008%, V 0.12%, N 0.014%, Remaining is Fe and inevitable impurity.
3. high-strength thick hot-rolling H-shaped piling bar according to claim 1, which is characterized in that including following mass percent Ingredient: C 0.19%, Si 0.43%, Mn 1.48%, P 0.007%, S 0.010%, 0.13%, N 0.0145%, Remaining is Fe and inevitable impurity.
4. high-strength thick hot-rolling H-shaped piling bar according to claim 1 to 3, which is characterized in that addition VN16 Alloy matches vanadium.
5. the preparation method of high-strength thick hot-rolling H-shaped piling bar according to claim 1 characterized by comprising
1) smelting condition
Raw materials and alloy material will comply with standard prescribed requirement, molten iron pretreatment, desulfurizing iron processing, it is desirable that and P≤ 0.120%.
2) converter
Terminal point control target value: C >=0.06%, P < 0.020%, temperature >=1640 DEG C；Using silicomanganese and manganese-ferro deoxidation alloy Change, there is aluminium final deoxidizing, pushing off the slag of tapping；
3) it refines
White slag operation is refined, whole to carry out blowing Ar operation by refining regulation, the soft blow time is greater than 8 minutes；
4) continuous casting
TL=1509 DEG C of liquidus temperature, molten steel overheat: Δ T≤35 DEG C, target Δ T≤30 DEG C are operated using permanent pulling rate；
5) hot rolling
High-strength 880-930 DEG C of piling bar finishing temperature；High-pressure water descaling.
6. preparation method according to claim 5, which is characterized in that it is described 3) according to converter molten steel ingredient and temperature into Row desulfurization, trimming and warming temperature.
7. preparation method according to claim 5, which is characterized in that finished product piling bar web thickness is 30mm-44mm.
CN201910898930.6A 2019-09-23 2019-09-23 A kind of high-strength thick hot-rolling H-shaped piling bar and preparation method thereof Pending CN110484822A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113832397A (en) * 2021-08-30 2021-12-24 包头钢铁（集团）有限责任公司 High-strength H-shaped steel pile and production method thereof
CN115011870A (en) * 2022-05-05 2022-09-06 包头钢铁（集团）有限责任公司 Preparation method of high-strength H-shaped steel pile for building structure
CN115505705A (en) * 2022-09-26 2022-12-23 包头钢铁（集团）有限责任公司 Rolling method of H-shaped steel pile for high-strength building structure
CN116716534A (en) * 2023-05-15 2023-09-08 包头钢铁（集团）有限责任公司 Manufacturing method of high-strength high-toughness anti-seismic hot rolled H-shaped steel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103589951A (en) * 2013-11-01 2014-02-19 内蒙古包钢钢联股份有限公司 Large section H shaped steel and its production method
CN104805354A (en) * 2015-04-30 2015-07-29 内蒙古包钢钢联股份有限公司 Boracic deep low temperature hot rolling H-section steel and preparation method thereof
CN109055855A (en) * 2018-08-01 2018-12-21 包头钢铁（集团）有限责任公司 A kind of H profile steel and its production method of high-strength low temperature resistant atmospheric corrosion resistance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103589951A (en) * 2013-11-01 2014-02-19 内蒙古包钢钢联股份有限公司 Large section H shaped steel and its production method
CN104805354A (en) * 2015-04-30 2015-07-29 内蒙古包钢钢联股份有限公司 Boracic deep low temperature hot rolling H-section steel and preparation method thereof
CN109055855A (en) * 2018-08-01 2018-12-21 包头钢铁（集团）有限责任公司 A kind of H profile steel and its production method of high-strength low temperature resistant atmospheric corrosion resistance

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113832397A (en) * 2021-08-30 2021-12-24 包头钢铁（集团）有限责任公司 High-strength H-shaped steel pile and production method thereof
CN115011870A (en) * 2022-05-05 2022-09-06 包头钢铁（集团）有限责任公司 Preparation method of high-strength H-shaped steel pile for building structure
CN115505705A (en) * 2022-09-26 2022-12-23 包头钢铁（集团）有限责任公司 Rolling method of H-shaped steel pile for high-strength building structure
CN116716534A (en) * 2023-05-15 2023-09-08 包头钢铁（集团）有限责任公司 Manufacturing method of high-strength high-toughness anti-seismic hot rolled H-shaped steel

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Application publication date: 20191122