CN109457177A - Q345 grades of hot rolled H-shaped and its smeltings and milling method - Google Patents
Q345 grades of hot rolled H-shaped and its smeltings and milling method Download PDFInfo
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- CN109457177A CN109457177A CN201811255426.6A CN201811255426A CN109457177A CN 109457177 A CN109457177 A CN 109457177A CN 201811255426 A CN201811255426 A CN 201811255426A CN 109457177 A CN109457177 A CN 109457177A
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- Prior art keywords
- hot rolled
- shaped
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- temperature
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Classifications
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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
-
- 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
- C22C38/04—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)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention provides a kind of Q345 grades hot rolled H-shaped and its smelting and milling methods, wherein, Q345 grades are hot rolled H-shaped, by percentage to the quality, chemical component are as follows: C 0.11~0.14%, Si 0.20~0.25%, Mn1.20~1.30%, P≤0.010%, S≤0.005%, V 0.04~0.07%, surplus are Fe and inevitable impurity.According to the technical solution of the present invention, by the way that V element is added, strengthen crystal boundary, form dislocation, hinder the formation and extension of intercrystalline crack, be conducive to improve plasticity；It is designed using narrow ingredient, hot rolled H-shaped yield strength and tensile strength fluctuation range are smaller, and shock resistance is good.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of Q345 grades hot rolled H-shaped, Q345 grades of hot-rolling H-shapeds
Smelting process and Q345 grade hot rolled H-shaped milling method of steel.
Background technique
With the high speed development of urban construction, high-rise, Super High and large-span steel building are a kind of development trends,
There is higher performance requirement to construction(al)steel in this way, other than improving the intensity rank of steel, it was also proposed that some special
It is required that such as anti-seismic performance.Steels for High Rise Buildings is mainly based on steel plate and fashioned iron, wherein hot rolled H-shaped in Steels for High Rise Buildings
In shared ratio it is very big.Meanwhile the steel construction based on hot rolled H-shaped, scientific and reasonable for structure, excellent in mechanical performance, knot
The advantages that structure stability is high, flexible design, has been widely used in building surface in big industrial factory and urban skyscraper field.Currently,
The common hot rolled H-shaped growth requirement for being no longer satisfied steel building of Q345 grade, it is necessary to develop with high-strength thus
Spend the H profile steel for building of high shock resistance.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, hot rolled H-shaped it is an object of the present invention to provide a kind of Q345 grades.
It is another object of the present invention to provide a kind of Q345 grades of hot rolled H-shaped smelting processes.
It is yet a further object of the present invention to provide a kind of Q345 grades of hot rolled H-shaped milling methods.
In view of this, the technical solution of first aspect present invention provide a kind of Q345 grades it is hot rolled H-shaped, with quality percentage
Than meter, chemical component are as follows: C 0.11~0.14%, Si 0.20~0.25%, Mn1.20~1.30%, P≤0.010%, S
≤ 0.005%, V 0.04~0.07%, surplus are Fe and inevitable impurity.
The technical solution of second aspect of the present invention proposes a kind of Q345 grades of hot rolled H-shaped smelting process, comprising: molten iron
Pretreatment；Converter smelting, control converter enters w [S]≤0.010% in furnace molten iron, Tapping Temperature of Bof is 1550~1600 DEG C；LF
Refining, LF heating time are 20min, refining time 35min；VD vacuum refining, VD furnace argon blowing time are not less than 10min；Even
The pulling rate range of slab, conticaster is 0.80m/min~1.0m/min, and less than 30 DEG C, specific water is the degree of superheat of steel grade
0.25L/mg。
The technical solution of third aspect present invention proposes a kind of Q345 grades of hot rolled H-shaped milling method, comprising: special-shaped
Base；Stepped heating stove heating；High pressure water dephosphorization；BD1 rolling；CCS tandem rolling；Sawing；Sampling；Cold bed pre-bending；Crop end；It rectifys
Directly；Wherein, billet heating temperature is 1210~1250 DEG C；Start rolling temperature≤1150 DEG C, 870~890 DEG C of finishing temperature.
One or more technical solution provided in an embodiment of the present invention, has at least the following technical effects or advantages:
The embodiment of the invention provides the techniques and method of a kind of earthquake-resistant hot rolled H profile steel of Q345 grades of VN microalloying, pass through
V element is added, strengthens crystal boundary, forms dislocation, hinders the formation and extension of intercrystalline crack, is conducive to improve plasticity；Using it is narrow at
Set up meter separately, hot rolled H-shaped yield strength and tensile strength fluctuation range are smaller, and shock resistance is good.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Specific embodiment
In order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage, With reference to embodiment
The present invention is further described in detail.It should be noted that in the absence of conflict, embodiments herein and reality
The feature applied in example can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Embodiment 1:
The Q345 grade of embodiment according to the present invention is hot rolled H-shaped, by percentage to the quality, chemical component are as follows: C
0.11~0.14%, Si 0.20~0.25%, Mn1.20~1.30%, P≤0.010%, S≤0.005%, V 0.04~
0.07%, surplus is Fe and inevitable impurity.
C is gap intensified element, and the intensity of matrix can be improved, meanwhile, and can be formed more with the alloying element in steel
Carbide is dissipated, dispersion-strengtherning is carried out to matrix, improves the intensity of material.Si is non-carbide forming element, is deposited with state of atom
It is between austenite and ferrite, solution strengthening ferrite.But Si too high levels, influence welding performance, make to weld the sense of organization
It can deteriorate, content is controlled 0.20~0.25.Mn element can be dissolved in ferrite, and the addition of Mn reduces the phase transformation of austenite
Temperature increases ferrite crystal nucleation speed and reduces ferrite crystal grain coarsening rate, to refine crystal grain.In steel
Micro alloying element V is added, crystal grain refinement and precipitation enhancement are mainly played.V forms carbonitride particle in conjunction with carbon, nitrogen.This
It is Austenite Grain Growth that a little carboritride particles can hinder original during heating, can inhibit to recrystallize in rolling
And recrystallization after crystal grain grow up, in cooling procedure when, precipitation play dispersion-strengthened action, thus improve material synthesis
Anti-seismic performance.In addition this steel grade is designed using narrow ingredient, stablizes the strong flexor ratio of H profile steel, fluctuation range is smaller, further increases
Shock resistance.
Embodiment 2:
The hot rolled H-shaped smelting process of the Q345 grade of embodiment according to the present invention, comprising: molten iron pretreatment；Converter smelting
Refining, control converter enters w [S]≤0.010% in furnace molten iron, Tapping Temperature of Bof is 1550~1600 DEG C；LF refining, when LF is heated
Between be 20min, refining time 35min；VD vacuum refining, VD furnace argon blowing time are not less than 10min；Continuous casting billet, conticaster
Pulling rate range is 0.80m/min~1.0m/min, and the degree of superheat of steel grade is less than 30 DEG C, specific water 0.25L/mg.
Embodiment 3:
The hot rolled H-shaped milling method of the Q345 grade of embodiment according to the present invention, comprising: Hot Metal in Beam Blank；Stepped heating
Stove heating；High pressure water dephosphorization；BD1 rolling；CCS tandem rolling；Sawing；Sampling；Cold bed pre-bending；Crop end；Aligning；Wherein, steel billet adds
Hot temperature is 1210~1250 DEG C；Start rolling temperature≤1150 DEG C, 870~890 DEG C of finishing temperature.
Specific embodiment:
A kind of Q345 grades of hot rolled H-shaped smelting process: molten iron pretreatment → converter smelting → LF refining → VD vacuum fine
Refining → continuous casting billet.Pneumatic steelmaking, external refining take corresponding technological measure in continuous casting production process, comprising: control converter enters
The quantity of slag, extension LF furnace are smart under w [S]≤0.009%, raising Tapping Temperature of Bof to 1600 DEG C or so, control converter in furnace molten iron
Time and the low pulling rate casting of continuous casting etc. are refined, up-to-standard continuous casting billet is produced.LF heating time and refining time are 20min
And 35min, VD furnace argon blowing time are no less than 10min, the pulling rate range of conticaster is 0.80m/min~1.0m/min, steel grade
The degree of superheat is less than 30 DEG C, specific water 0.25L/mg.Following example chemical component is as shown in table 1.
1 each example ingredient (mass percent/%) of table
A kind of Q345 grades of hot rolled H-shaped rolling mill practice are as follows: Hot Metal in Beam Blank → stepped heating stove heating → high pressure water dephosphorization
→ BD1 rolling → CCS tandem rolling → sawing → sampling → cold bed pre-bending → crop end → aligning → inspection → bundling → storage.Its steel
Base heating temperature is 1210~1250 DEG C；Start rolling temperature≤1150 DEG C, 870~890 DEG C of finishing temperature.Experiment sampling is from table
Example 4 in one.Wherein tensile sample specification is gauge length L0=50mm, diameter D=10mm.Impact test uses
10mmxl0mmx55mm Charpy v-notch sample, test temperature are -20 DEG C 5 DEG C of soil, and experimental result is as shown in table 2.
Each example mechanical property of table 2
From table 2 it can be seen that each example has good strength, toughness and mechanical property.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of Q345 grades is hot rolled H-shaped, which is characterized in that by percentage to the quality, chemical component are as follows: C 0.11~
0.14%, Si 0.20~0.25%, Mn1.20~1.30%, P≤0.010%, S≤0.005%, V 0.04~0.07% are remaining
Amount is Fe and inevitable impurity.
2. a kind of Q345 grades of hot rolled H-shaped smelting process characterized by comprising
Molten iron pretreatment；
Converter smelting, control converter enters w [S]≤0.010% in furnace molten iron, Tapping Temperature of Bof is 1550~1600 DEG C；
LF refining, LF heating time are 20min, refining time 35min；
VD vacuum refining, VD furnace argon blowing time are not less than 10min；
The pulling rate range of continuous casting billet, conticaster is 0.80m/min~1.0m/min, and the degree of superheat of steel grade is less than 30 DEG C, specific water
For 0.25L/mg.
3. a kind of Q345 grades of hot rolled H-shaped milling method characterized by comprising
Hot Metal in Beam Blank；Stepped heating stove heating；High pressure water dephosphorization；BD1 rolling；CCS tandem rolling；Sawing；Sampling；Cold bed pre-bending；It cuts
End to end；Aligning；
Wherein, billet heating temperature is 1210~1250 DEG C；Start rolling temperature≤1150 DEG C, 870~890 DEG C of finishing temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811255426.6A CN109457177A (en) | 2018-10-26 | 2018-10-26 | Q345 grades of hot rolled H-shaped and its smeltings and milling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811255426.6A CN109457177A (en) | 2018-10-26 | 2018-10-26 | Q345 grades of hot rolled H-shaped and its smeltings and milling method |
Publications (1)
| Publication Number | Publication Date |
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| CN109457177A true CN109457177A (en) | 2019-03-12 |
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ID=65608419
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|---|---|---|---|
| CN201811255426.6A Pending CN109457177A (en) | 2018-10-26 | 2018-10-26 | Q345 grades of hot rolled H-shaped and its smeltings and milling method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110616379A (en) * | 2019-09-27 | 2019-12-27 | 邯郸钢铁集团有限责任公司 | Q345C steel and production method thereof |
| CN111647810A (en) * | 2020-05-28 | 2020-09-11 | 鞍钢股份有限公司 | Channel steel with yield strength of 355MPa for bridge and production method thereof |
| CN112246864A (en) * | 2020-09-17 | 2021-01-22 | 马鞍山钢铁股份有限公司 | Production method of weather-resistant hot-rolled H-shaped steel |
| CN112760558A (en) * | 2020-12-10 | 2021-05-07 | 包头钢铁（集团）有限责任公司 | Q355-grade Ti microalloyed high-strength hot-rolled H-shaped steel and production method thereof |
| CN115323282A (en) * | 2022-07-06 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot-rolled H-shaped steel for high-grade building structure and production method thereof |
| CN116200652A (en) * | 2022-09-07 | 2023-06-02 | 包头钢铁（集团）有限责任公司 | Production and preparation method of Q390GJC hot rolled H-shaped steel for high-performance building |
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| CN102618781A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel |
| CN104018074A (en) * | 2014-06-19 | 2014-09-03 | 马钢(集团)控股有限公司 | Low-temperature-resistant H-shaped steel and production process thereof |
| CN104278195A (en) * | 2014-10-15 | 2015-01-14 | 山东钢铁股份有限公司 | 345MPa low-yield-tensile ratio H-shaped steel and preparation method thereof |
| CN104831154A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-beam and production method thereof |
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| CN102618781A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel |
| CN104018074A (en) * | 2014-06-19 | 2014-09-03 | 马钢(集团)控股有限公司 | Low-temperature-resistant H-shaped steel and production process thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110616379A (en) * | 2019-09-27 | 2019-12-27 | 邯郸钢铁集团有限责任公司 | Q345C steel and production method thereof |
| CN111647810A (en) * | 2020-05-28 | 2020-09-11 | 鞍钢股份有限公司 | Channel steel with yield strength of 355MPa for bridge and production method thereof |
| CN111647810B (en) * | 2020-05-28 | 2021-07-20 | 鞍钢股份有限公司 | Channel steel with yield strength of 355MPa for bridge and production method thereof |
| CN112246864A (en) * | 2020-09-17 | 2021-01-22 | 马鞍山钢铁股份有限公司 | Production method of weather-resistant hot-rolled H-shaped steel |
| CN112760558A (en) * | 2020-12-10 | 2021-05-07 | 包头钢铁（集团）有限责任公司 | Q355-grade Ti microalloyed high-strength hot-rolled H-shaped steel and production method thereof |
| CN115323282A (en) * | 2022-07-06 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot-rolled H-shaped steel for high-grade building structure and production method thereof |
| CN115323282B (en) * | 2022-07-06 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot rolled H-shaped steel for high-grade building structure and production method thereof |
| CN116200652A (en) * | 2022-09-07 | 2023-06-02 | 包头钢铁（集团）有限责任公司 | Production and preparation method of Q390GJC hot rolled H-shaped steel for high-performance building |
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Application publication date: 20190312 |
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