CN107299283A - Depth low temperature resistant hot rolled H-shaped and its production technology - Google Patents
Depth low temperature resistant hot rolled H-shaped and its production technology Download PDFInfo
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- CN107299283A CN107299283A CN201710390856.8A CN201710390856A CN107299283A CN 107299283 A CN107299283 A CN 107299283A CN 201710390856 A CN201710390856 A CN 201710390856A CN 107299283 A CN107299283 A CN 107299283A
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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
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of depth low temperature resistant hot rolled H-shaped, its chemical composition according to mass percent meter, including：C 0.08 0.12%, Si 0.15 0.30%, Mn 1.45 1.60%, P≤0.02%, S≤0.020%, Alt 0.025~0.050%, Ti 0.01~0.02%, Nb 0.003~0.005%, remaining is iron and impurity.The invention also discloses a kind of production technology of depth low temperature resistant hot rolled H-shaped.The present invention is by adding trace alloying element Nb, Ti, and optimized production process method makes the mechanical property of material reach deep hypothermia impact requirement.
Description
Technical field
The present invention relates to a kind of metallurgical technology, specifically, it is related to a kind of depth low temperature resistant hot rolled H-shaped and its production work
Skill.
Background technology
NORTHWEST CHINA, the Northeast's winter temperature are cold, and the requirement of structural steel On Impact Toughness needs to reach -50 DEG C of left sides
It is right；Other oil platform construction at sea, polar region exploitation, etc. in terms of Special use, and the national requirements heat such as outlet Russia
Roll H profile steel and meet -50 DEG C to -70 DEG C impact flexibility technical requirements.The S275NL of such as European standard EN10025-3 productions,
- 50 DEG C of ballistic work >=27J of S355NL, S420N, S460NL continuous request；Mark -55 DEG C of the grades of steel such as SLA325, SLA365 requirement day
Ballistic work, the С 345 of Russia's mark Г О С Т 27772-88 production, С 345 К, С 375 grade of steel require -70 DEG C of ballistic work >=29J.
The hot rolled H-shaped technological means for ensureing low-temperature impact toughness mainly has two kinds of approach：One kind is by rolling process
Middle controlled rolling and controlled cooling realizes refined crystalline strengthening, reaches the purpose for ensureing low-temperature impact toughness；Another is to ensure that low temperature is rushed by adding
Hit the alloying components such as nickel, the molybdenum of toughness and reach the high purpose of low-temperature impact toughness.All there is substantially not enough, controlled rolling control in both approach
Cold Fabricating Technology of Fine-grained Strengthening is very difficult to control in production, requires high to milling train, temperature control be difficult to and also qualification rate compared with
It is low, while influenceing big to rhythm of production, be not suitable for continuous batch production, in addition using the type after controlled rolling and controlled cooling Fabricating Technology of Fine-grained Strengthening
Weld seam is low with respect to matrix hardness after steel welding；Second of approach is to add a large amount of nickel, molybdenum alloy to make low-temperature impact toughness significantly
Reduction, but be due to that nickel molybdenum cost is too high, economical production is difficult to.Seek a kind of less than -40 DEG C to -60 DEG C low temperature punching of production
The H profile steel for hitting toughness stabilization and low production cost is extremely important, and with great economy and social benefit, to Chinese H types
Product made from steel it is perfect, to China from big steel country to steel power transformation have Great significance.
The hot rolled H-shaped generally low-alloy high-tensile structural steel of deep hypothermia impact flexibility requirement is currently required that, wherein
It is wide with Q345 level applications.C, D, E grades of steel requirements of Q345 ranks have good low-temperature flexibility, and GB/T1591-2008 will
Seek -40 DEG C >=34J in Q345E steel longitudinal direction.At present, niobium, vanadium, titanium micro- conjunction is mainly taken Q345 ranks low-alloy high-tensile structural steel
The technique that aurification and controlled rolling and controlled cooling are combined improves steel combination property, particularly low-temperature impact toughness.Its strengthening mechanism is heavy
Form sediment and strengthen and refined crystalline strengthening, the latter is also beneficial to toughness.During the actual industrial production of Q345 rank H profile steels, warp
Niobium, vanadium, titanium are single or combine after microalloying and cooling controlling and rolling controlling process, and less than -40 DEG C ballistic works fluctuate larger and qualification rates not
It is high.
The content of the invention
Technical problem solved by the invention is to provide a kind of depth low temperature resistant hot rolled H-shaped and its production technology, passes through
Trace alloying element Nb, Ti are added, and optimized production process method makes the mechanical property of material reach deep hypothermia impact requirement.
Technical scheme is as follows：
A kind of depth low temperature resistant hot rolled H-shaped, its chemical composition according to mass percent meter, including：C0.08-0.12%,
Si 0.15-0.30%, Mn 1.45-1.60%, P≤0.02%, S≤0.020%, Al t 0.025~0.050%, Ti
0.003~.005% of 0.01~0.02%, Nb, remaining is iron and impurity.
Further：[N]≤40%, [O]≤20%, [H]≤2.5ppm.
A kind of production technology of depth low temperature resistant hot rolled H-shaped, including：
Converter smelting；Using silicomanganese and Fe-al-mn Deoxidizing, final deoxidizing is using there is aluminium deoxidation, and mass percent meter turns
Stove terminal point control desired value includes：C >=0.06%, P ＜ 0.010%, tapping temperature >=1640 DEG C；
During LF refining, whole Bottom Argon Stirring, the refining later stage adds ferro-niobium and ferrotianium；During VD vacuum metlings,
Deep vacuum time >=15min, vacuum≤0.1KPa, soft blow time >=15min；
Continuous casting special-shaped base；Molten steel overheat Δ T≤30 DEG C, desired value Δ T≤20 DEG C are operated using permanent pulling rate；
The rolling of H profile steel；1150 DEG C -1300 DEG C of heating-up temperature, 1100 DEG C -1280 DEG C of breaking down temperature, finishing temperature 880
℃-950℃；Obtained depth low temperature resistant hot rolled H-shaped, its chemical composition according to mass percent meter, including：C 0.08-
0.12%, Si 0.15-0.30%, Mn 1.45-1.60%, P≤0.02%, S≤0.020%, Al t 0.025~
0.050%, Ti 0.01~0.02%, Nb0.003~.005%, remaining is iron and impurity.
It is preferred that：The mass fraction desired value of molten steel composition, C 0.10%, Si 0.20%, Mn 1.50%, P after refining
≤ 0.015%, S≤0.010%, Nb 0.004%, Alt0.03%, Ti0.01%.
It is preferred that：During converter smelting, using slag-stopping tapping, pushing off the slag failure must skim；Water under high pressure is carried out after the completion of rolling
De-scaling.
Compared with prior art, the technology of the present invention effect includes：
1st, it is 0.002% that this patent, which strictly controls B content to add the upper limit, from composition, there is data in actual industrial production
The excessive addition of display B element directly affects the ductility and impact of steel, when B content is added beyond 0.003% ductility and
Impact property is decreased obviously.The present invention is using low-carbon, low silicon, Gao Meng, and the strict control Boron contents upper limit, control aluminium, control gas contain
The smelting process of amount.
2nd, temperature carries out H profile steel in 880 DEG C -950 DEG C before the last a time machine of the achievable universal mill finish to gauge of the present invention
High-temperature final rolling, the operation of rolling is cooled down without control, and carrying out delivery with rolled uses, and steel have good synthesis mechanical property
Energy.
3rd, product composition of the present invention is reasonable in design, by adding trace alloying element Nb, Ti, and optimized production process method
Material mechanical performance is reached deep hypothermia impact requirement, can produce and manufacture in most easy, efficient method again, reduce life
Produce cost.
The present invention is first using the composite micro-alloyed production deep hypothermia hot-rolling H-shapeds of addition Nb+Ti in Hot Metal in Beam Blank smelting process
Steel, production cost is far below the use of nickel element.
4th, the present invention realizes the hot rolled H-shaped scale industrial production of Hot Metal in Beam Blank production deep hypothermia.Sale H can be met
The diversification of shaped steel kind, is that Baogang realizes Europe superscript, American Standard, Ying Biao, day mark, the moderate hypothermia H profile steel (0 of Russian standard
DEG C, -20 DEG C) and deep hypothermia (- 40 DEG C) laid the foundation with H profile steel series of products.
5th, while peritectoid Nb bearing steel is smelted, Al content control is more than 0.025% in steel, and the Hot Metal in Beam Blank mouth of a river is also easy to produce storage
Dead phenomenon, increases the cast of continuous casting billet and draws steel difficulty.Under present component design, the steel of above-mentioned technique productions are performed
Product depth cryogenic property highlights excellent, and casting blank inner organization is fine and closely woven, zero defect, and to obtain excellent depth low for product after hot rolling
Warm nature energy.
Brief description of the drawings
Fig. 1 is the graph of a relation between different temperatures and V-type ballistic work in the present invention；
Fig. 2 is the graph of a relation between different temperatures and U-shaped ballistic work in the present invention；
Fig. 3 is metallographic structure (F+B+P) figure in the present invention；
Fig. 4 is tissues observed (F+B+P) figure under SEM in the present invention；
Fig. 5 is the micro-organization chart that fracture expansion area is cleavage+dimple in the present invention；
Fig. 6 is the micro-organization chart of Dislocations of the present invention and precipitate；
Fig. 7 is the micro-organization chart of energy spectrum analysis precipitate composition in the present invention.
Embodiment
Technical solution of the present invention is elaborated below with reference to example embodiment.However, example embodiment can
Implement in a variety of forms, and be not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that
The design of example embodiment more comprehensively and completely, and is comprehensively conveyed to those skilled in the art by the present invention.
The production technology of depth low temperature resistant hot rolled H-shaped, including：Molten iron pretreatment, converter smelting, LF refining, VD vacuum
Smelting, continuous casting special-shaped base, the rolling of H profile steel, aligning, storage, specifically include following steps：
Step 1：Converter smelting；
Using silicomanganese and Fe-al-mn Deoxidizing, final deoxidizing, which is used, aluminium deoxidation.Using slag-stopping tapping, pushing off the slag failure is necessary
Skim.Converter terminal control targe value (mass percent)：C >=0.06%, P ＜ 0.010%, tapping temperature >=1640 DEG C
Step 2：LF refining；
Whole Bottom Argon Stirring, according to circumstances blows big argon gas amount, and white slag is made in refining, and the refining later stage adds ferro-niobium and ferrotianium.
Step 3：VD vacuum metlings；
Deep vacuum time >=15min, vacuum≤0.1KPa, soft blow time >=15min；
Molten steel composition desired value (mass fraction %) after refining, C 0.10%, Si 0.20%, Mn1.50%, P≤
0.015%, S≤0.010%, Nb 0.004%, Alt0.03%, Ti0.01%.
Step 4：Continuous casting special-shaped base；
TL=1518 DEG C of liquidus temperature；Molten steel overheat：Δ T≤30 DEG C, desired value Δ T≤20 DEG C；Using permanent pulling rate
Operation.
Step 5：The rolling of H profile steel；
The lower limit temperature in rolling procedure is being used to be rolled on the basis of ensureing steel section size, heating-up temperature 1150
DEG C -1300 DEG C, 1100 DEG C -1280 DEG C of breaking down temperature, 880 DEG C -950 DEG C of finishing temperature.
High-pressure water descaling is carried out after the completion of rolling, takes production sample to carry out field trash, tissue, grain size evaluation and performance inspection
Test.
Finished product depth low temperature resistant hot rolled H-shaped, its chemical composition according to mass percent meter, including：C0.08-0.12%,
Si 0.15-0.30%, Mn 1.45-1.60%, P≤0.02%, S≤0.020%, Al t0.025~0.050%, Ti 0.01
0.003~.005% of~0.02%, Nb, [N]≤40%, [O]≤20%, [H]≤2.5ppm.
Technical indicator
1st, cc billet surface quality requirement：Casting billet surface flawless, scab, sand holes, be mingled with, the defect such as stomata and pin hole.
2nd, non-metallic inclusion
The non-metallic inclusion of steel should be shown in Table 1 by the standard ratings of GB/T 10561, field trash grading.
The field trash of table 1 requires unit level
| A | B | C | D | Ds |
| ≤1.5 | ≤1.0 | ≤1.5 | ≤2.0 | ≤2.0 |
3rd, grain size
Grain size is not less than 7 grades, and crystal grain inhomogeneities should be in three level ranges, and metallographic structure is pearlite+iron element
Iron.
4th, mechanical property
The mechanical property of table 2
Embodiment 1
Steel mill smelts Aluminum steel, and three streams draw steel, and pulling rate is relatively low (0.6m/min~0.9m/min), the degree of superheat 20 DEG C~22
DEG C, strand temperature is low, draws steel process retaining lip reflex occur, steel mill changes the mouth of a river in time to protect production, with relatively low pulling rate
Obtain good slab quality.Table 3 is chemical composition, and table 4 is smelting process parameter.
The specification shaped steel of beam-and-rail factory 6.5 х of rolling H 300 х, 150 х 9, to Nb bearing steel without controlled rolling, before CCS machines not
Temperature is treated in progress, and Q345E (low-carbon contains Nb), rolling temperature temperature-measuring gun was determined as follows：
Enter BD1 temperature：1139℃、1133℃
Temperature before last a time machine：1128℃
Temperature after last a time machine：1066℃
Enter CCS temperature：1008℃
Temperature before last a time machine：872℃、858℃
Temperature after last a time machine：904℃、889℃、880℃、885℃、887℃、858℃
Table 3 Industry trial-production composition (mass fraction) %
| Smelting number | C | Si | Mn | P | S | Al | Nb | Ti |
| 15300588 | 0.11 | 0.28 | 1.47 | 0.010 | 0.010 | 0.044 | 0.047 | 0.015 |
The smelting process parameter of table 4
As shown in figure 1, being the graph of a relation in the present invention between different temperatures and V-type ballistic work；As shown in Fig. 2 being the present invention
Graph of a relation between middle different temperatures and U-shaped ballistic work.
Sampled at the hot saw of rolled h-section steel beam production line, H profile steel, which naturally cools to sample at wing plate after room temperature, carries out power
Performance and metallographic structure detection are learned, mechanical property is shown in Table 5, table 6, organizes, is mingled with, grain size evaluation is shown in Table 7.
5 pulling force of table three
| Heat (batch) number | Rel | Rm | Extension | Clod wash (d=2a) |
| 15300583 | 457.68 | 583.08 | 30.10 | It is qualified |
The different temperatures impact flexibility of table 6
As shown in figure 3, being metallographic structure (F+B+P) figure in the present invention；As shown in figure 4, being observation group under SEM in the present invention
Knit (F+B+P) figure；As shown in figure 5, being the micro-organization chart that fracture expansion area is cleavage+dimple in the present invention；As shown in fig. 6,
It is the micro-organization chart of Dislocations of the present invention and precipitate；As shown in fig. 7, being the micro- of energy spectrum analysis precipitate composition in the present invention
See organization chart.
The mirco structure of table 7 is evaluated
Term used herein is explanation and exemplary and nonrestrictive term.Because the present invention can be with a variety of
Form specific implementation without departing from the spiritual or substantive of invention, it should therefore be appreciated that above-described embodiment be not limited to it is any foregoing
Details, and should widely being explained in the spirit and scope that appended claims are limited, thus fall into claim or its etc.
Whole changes and remodeling in the range of effect all should be appended claims and covered.
Claims (5)
1. a kind of depth low temperature resistant hot rolled H-shaped, it is characterised in that：Its chemical composition according to mass percent meter, including：C
0.08-0.12%, Si 0.15-0.30%, Mn 1.45-1.60%, P≤0.02%, S≤0.020%, Alt 0.025~
0.003~.005% of 0.050%, Ti 0.01~0.02%, Nb, remaining is iron and impurity.
2. depth low temperature resistant hot rolled H-shaped as claimed in claim 1, it is characterised in that：[N]≤40%, [O]≤20%, [H]≤
2.5ppm。
3. a kind of production technology of depth low temperature resistant hot rolled H-shaped, including：
Converter smelting；Using silicomanganese and Fe-al-mn Deoxidizing, final deoxidizing is using there is aluminium deoxidation, and mass percent meter, converter is whole
Point control targe value includes：C >=0.06%, P ＜ 0.010%, tapping temperature >=1640 DEG C；
During LF refining, whole Bottom Argon Stirring, the refining later stage adds ferro-niobium and ferrotianium；It is deep true during VD vacuum metlings
Between space-time >=15min, vacuum≤0.1KPa, soft blow time >=15min；
Continuous casting special-shaped base；Molten steel overheat Δ T≤30 DEG C, desired value Δ T≤20 DEG C are operated using permanent pulling rate；
The rolling of H profile steel；1150 DEG C -1300 DEG C of heating-up temperature, 1100 DEG C -1280 DEG C of breaking down temperature, 880 DEG C -950 of finishing temperature
℃；Obtained depth low temperature resistant hot rolled H-shaped, its chemical composition according to mass percent meter, including：C 0.08-0.12%, Si
0.15-0.30%, Mn 1.45-1.60%, P≤0.02%, S≤0.020%, Alt 0.025~0.050%, Ti 0.01~
0.02%, Nb0.003~.005%, remaining is iron and impurity.
4. the production technology of depth low temperature resistant hot rolled H-shaped as claimed in claim 3, it is characterised in that：Molten steel composition after refining
Mass fraction desired value, C 0.10%, Si 0.20%, Mn 1.50%, P≤0.015%, S≤0.010%, Nb
0.004%, Alt0.03%, Ti0.01%.
5. the production technology of depth low temperature resistant hot rolled H-shaped as claimed in claim 3, it is characterised in that：During converter smelting, use
Slag-stopping tapping, pushing off the slag failure must skim；High-pressure water descaling is carried out after the completion of rolling.
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| 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 |
| CN110438397A (en) * | 2019-08-12 | 2019-11-12 | 山东钢铁股份有限公司 | A kind of big cross section is hot rolled H-shaped and preparation method thereof containing aluminium |
| CN112593038A (en) * | 2020-12-23 | 2021-04-02 | 唐山燕山钢铁有限公司 | Smelting and pouring process of L245 pipeline steel |
| CN113943847A (en) * | 2021-09-24 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Production method of H-shaped steel for low-temperature-resistant structure with yield strength of 400MPa |
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Application publication date: 20171027 |