CN108774710A - A kind of high intensity crane arm support steel and production method thereof - Google Patents
A kind of high intensity crane arm support steel and production method thereof Download PDFInfo
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- CN108774710A CN108774710A CN201810558392.1A CN201810558392A CN108774710A CN 108774710 A CN108774710 A CN 108774710A CN 201810558392 A CN201810558392 A CN 201810558392A CN 108774710 A CN108774710 A CN 108774710A
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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
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
-
- 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
-
- 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
- C21D2211/008—Martensite
Abstract
The present invention provides a kind of high intensity crane arm support steel and production method thereofs, contain following weight percent element：C0.050~0.080%, Si 0.15~0.25%, Mn 1.70~1.90%, P≤0.020%, S≤0.010%, Als 0.020~0.060%, Cr 0.20~0.24%, Nb 0.06~0.08%, Mo 0.10~0.12%, Ti 0.11~0.13%, surplus are Fe and inevitable impurity.Compared with prior art, crane arm structure special steel metallographic structure produced by the invention is acicular ferrite, granular bainite and a small amount of tempered martensite, has high intensity, excellent plasticity and toughness, also has higher wearability and weldability energy.
Description
Technical field
The invention belongs to hot-rolled steel plate fields, are related to a kind of high intensity crane arm support steel and production method thereof,
This product be exclusively used in production crane arm support structure member, such as move automobile crane locomotive, fixed tower lifting
Machine, rail mounted bridge crane crane arm structure.
Background technology
Entire boom structure carries the stress spy such as raising, luffing, flexible, revolution, control, support when crane work
Point, this requires not only there are high intensity, excellent plasticity and toughness for producing the steel of crane arm structure, also to have compared with
High wearability and weldability energy.It just can guarantee its security performance.
The high-strength steel grade of domestic production at present is produced using the purpose of approach for a variety of, there is no particular for
Crane arm structure and research and develop a kind of special structural section.And steel also rely on import as domestic a big chunk,
Therefore it is necessary to be directed to crane arm support and develop a kind of special structural section.
Invention content
The purpose of the present invention is to provide a kind of high intensity crane arm support steel, using low C, low Si, appropriate addition
Cr, Mo, Nb, Ti alloying element make steel have high intensity, excellent plasticity and toughness, also to have higher wearability and solderable
Performance is connect, crane arm topology requirement is met.
The present invention also provides a kind of production method of high intensity crane arm support steel, technical recipe coordinates appropriate
Steel-making and suitable TMCP techniques, are produced with high intensity, excellent plasticity and toughness, also have higher wearability and solderable
The special hot rolled strip steel of crane arm structure of performance.
Specific technical solution of the present invention is as follows：
A kind of high intensity crane arm support steel provided by the invention, contain following weight percent element：
C 0.050~0.080%, Si 0.15~0.25%, Mn 1.70~1.90%, P≤0.020%, S≤
0.010%, Als 0.020~0.060%, Cr 0.20~0.24%, Nb 0.06~0.08%, Mo 0.10~0.12%, Ti
0.11~0.13%, surplus is Fe and inevitable impurity.
This steel grade is using low C, low Si, the steel grade group for adding Cr, Mo, Nb, Ti alloying element in right amount, Cr, Mo alloying element
Addition can keep the hardness of steel, improve the wearability of steel, while improving the intensity of steel, increase to deformation,
The drag of cracking, can eliminate residual stress to a certain extent, and Mo elements also have the function of improving steel plasticity and toughness.Suitably carry
High Ti constituent contents are to ensure to improve the high intensity of steel, and the tendency that crystal grain is grown up when can adjust steel high temperature improves steel
Weldability energy.Nb elements improve the creep strength of steel, avoid hardening temper brittleness, improve the low temperature of steel steel and high temperatures
Can, and the plasticity and toughness of steel are improved to a certain extent.The addition proportioning of the above alloying element can effectively play this steel
Use the performance advantage in crane arm structure.
A kind of production method of high intensity crane arm support steel provided by the invention, technological process are：
Molten iron pretreatment → converter smelting → alloy finely tunes station → LF refining → continuous casting → strand heat treatment → controlled rolling and controlled cooling
→ smooth → crosscutting → finished product；
Wherein, strand cold charge enters stove, and time inside furnace was controlled at 4-6 hours；Steel billet tapping temperature is by 1250 ± 20 DEG C of controls
System；
Further, steel grade strand requires stacking slow cooling processing, red base to enter pile in time, and temperature retention time is more than 72 hours,
Strand is checked after 72 hours, especially the inspection of strand edge and corner crack, doubtful crackle such as occur will be to it
There is side to avoid the coiled sheet edge after rolling and splits equal surface quality defects in progress flame treatment；
Further, base target thickness among coiled sheet：60±2mm；
Further, roughing mill pressure pattern is 3+5 patterns, and seven rack of finishing mill all comes into operation；
Further, mm finishing mill unit reduction ratio uses equilibrium assignment pattern, increases the drafts of F3~F7 racks, finish rolling pressure
Contracting is than by 3.5 controls；
Further, roller repairing uses full section section cooling pattern, cooling velocity to control in 30-40 DEG C/S；
Further, at 1250 ± 20 DEG C, finish rolling finishing temperature is controlled at 840 ± 20 DEG C, batches temperature for soaking temperature control
Degree control is at 550 ± 20 DEG C.
Further, molten iron must carry out desulfurization process to reduce S contents.Converter uses iron block less as possible, improves high-quality
Steel scrap ratio avoids the high phenomenon of sulphur caused by iron block, can further mitigate so special stove, refining desulfurization task.
Ensure Molten Steel Cleanliness in production is constituted, generation is avoided to be mingled with；Template is normal in the guarantee operation of rolling；Strictly
Controlled rolling technique and ensure its surface quality；Meet requirement of the export contract to product quality and performance.
In subsequent course of hot rolling, increases mm finishing mill unit reduction ratio using appropriate, used in the tail portion section cooling stage
Full cooling section cooling batches the coiling technique of section temperature and controls the optimum performance of steel to improve cooling rate to reach to reduce.
The steel produced using present invention process are had with high intensity, excellent plasticity and toughness, also to be had higher wear-resisting
Property and weldability energy, the structure member for manufacturing crane arm support, such as the automobile crane locomotive, fixed tower that moves
Crane, rail mounted bridge crane crane arm structure.
Compared with prior art, crane arm structure special steel ingredient on chemical element produced by the invention is steady
It is fixed, there are high intensity, excellent plasticity and toughness, also there is higher wearability and weldability energy；It is produced according to the method for the present invention
Steel plate metallographic structure be acicular ferrite, granular bainite and a small amount of tempered martensite, yield strength can be in mechanical property
850MPa, elongation percentage >=20%, -20 DEG C of Charpy impact toughness impacts of steel grade can be reached by reaching 750MPa or more, tensile strength
The minimum reachable 90J or more of work(, 180 degree clod wash d=2a is qualified, and -20 DEG C of Charpy impact toughness ballistic works in welded seam region are most
Low reachable 80J or more has good solderable solution performance.
Description of the drawings
Fig. 1 is the metallographic structure of steel produced by the invention；
Fig. 2 is steel cold bending experiment (just curved) produced by the invention；
Fig. 3 is steel cold bending experiment produced by the invention (back of the body is curved)；
Fig. 4 is weld seam macrograph at welded steel produced by the invention；
Fig. 5 is the melting area of welding seam at welded steel produced by the invention.
Specific implementation mode
Embodiment 1-5
A kind of high intensity crane arm support steel contain following weight percent element：It see the table below 1.Surplus is Fe
With inevitable impurity.
Table 1
| Embodiment | C | Si | Mn | P | S | Als | Cr | Nb | Mo | Ti |
| Embodiment 1 | 0.060 | 0.20 | 1.80 | ≤0.020 | ≤0.010 | 0.040 | 0.22 | 0.07 | 0.11 | 0.12 |
| Embodiment 2 | 0.065 | 0.2 | 1.80 | ≤0.020 | ≤0.010 | 0.030 | 0.22 | 0.065 | 0.11 | 0.11 |
| Embodiment 3 | 0.060 | 0.15 | 1.70 | ≤0.020 | ≤0.010 | 0.020 | 0.20 | 0.06 | 0.10 | 0.11 |
| Embodiment 4 | 0.050 | 0.25 | 1.90 | ≤0.020 | ≤0.010 | 0.025 | 0.24 | 0.08 | 0.12 | 0.13 |
| Embodiment 5 | 0.070 | 0.15 | 1.80 | ≤0.020 | ≤0.010 | 0.030 | 0.23 | 0.07 | 0.12 | 0.12 |
This steel grade is using low C, low Si, the steel grade group for adding Cr, Mo, Nb, Ti alloying element in right amount, Cr, Mo alloying element
Addition can keep the hardness of steel, improve the wearability of steel, while improving the intensity of steel, increase to deformation,
The drag of cracking, can eliminate residual stress to a certain extent, and Mo elements also have the function of improving steel plasticity and toughness.Suitably carry
High Ti constituent contents are to ensure to improve the high intensity of steel, and the tendency that crystal grain is grown up when can adjust steel high temperature improves steel
Weldability energy.Nb elements improve the creep strength of steel, avoid hardening temper brittleness, improve the low temperature of steel steel and high temperatures
Can, and the plasticity and toughness of steel are improved to a certain extent.The addition proportioning of the above alloying element can effectively play this steel
Use the performance advantage in crane arm structure.
High intensity crane arm support steel production method described in embodiment 1-5, technological process are：
Molten iron pretreatment → converter smelting → alloy finely tunes station → LF refining → continuous casting → strand heat treatment → controlled rolling and controlled cooling
→ smooth → crosscutting → finished product；
In course of hot rolling, increases mm finishing mill unit reduction ratio using appropriate, full cooling section is used in the tail portion section cooling stage
It is cooling to batch the coiling technique of section temperature to reach to reduce to improve cooling rate and control the optimum performance of steel.
Molten iron must carry out desulfurization process to reduce S contents.Converter uses iron block less as possible, improves high-quality steel scrap ratio,
Avoid the high phenomenon of sulphur caused by iron block, can further mitigate so special stove, refining desulfurization task.
Further,
1) it skims before and after molten iron pre-processing requirements；
2) to reinforce pushing off the slag work of tapping at converter producing, deoxidation alloying is carried out in tapping process；
3) alloy fine tuning station is added aluminum shot and stirs by force and tentatively restored to top slag；
4) FeTi70 is used at LF stoves, and is ensured to feed and total before and after calcium line weak stirred the time and be more than 15min；
5) packet target temperature controls above 15-30 DEG C in liquidus temperature in continuous casting zone；
6) steel grade strand requires stacking slow cooling processing, and red base will enter pile in time, after temperature retention time is more than 72 hours, 72 hours
Strand is checked, especially the inspection of strand edge and corner crack, flame will be carried out to it by doubtful crackle such as occur
It handles, side occur to avoid the coiled sheet edge after rolling splits equal surface quality defects；
7) strand cold charge enters stove, time inside furnace 4 hours；Steel billet tapping temperature is by 1250 ± 20 DEG C of controls；
8) base target thickness among coiled sheet：60±2mm；
9) roughing mill pressure pattern is 3+5 patterns, and seven rack of finishing mill all comes into operation；
10) mm finishing mill unit reduction ratio uses equilibrium assignment pattern, suitably increases the drafts of F3~F7 racks, finish rolling compression
Than pressing 3.5 controls；
11) roller repairing uses full section section cooling pattern, cooling velocity to control in 30-40 DEG C/S；
12) soaking temperature control is at 1250 ± 20 DEG C, and finish rolling finishing temperature control is at 840 ± 20 DEG C, oiler temperature control
At 550 ± 20 DEG C.
Fig. 1 is the metallographic structure of steel produced by the invention；Fig. 2 is steel cold bending experiment (just curved) produced by the invention；
Fig. 3 is steel cold bending experiment produced by the invention (back of the body is curved)；Fig. 4 is weld seam macrograph at welded steel produced by the invention；
Fig. 5 is the melting area of welding seam at welded steel produced by the invention.
As seen from Figure 1, metallographic structure is acicular ferrite, granular bainite and a small amount of tempered martensite.Acicular ferrite
It is the tissue for meeting great line energy and low welding crack sensitivity, low-temperature flexibility can be improved, reduce welding crack sensibility, ensures
Steel grade has good cold molding and solderability；The presence of martensitic structure adds somewhat to the hard of material
Degree, increases the drag to deformation, cracking and abrasion；The non-laminar line and staff control of bainite actually ferrite and carbide increases
Intensity and the plasticity and toughness cooperation of material are added.Tiny crystal grain improves the welding performance of material.Pass through Fig. 2 and Fig. 3 materials
From the point of view of cold bending test result, occur without crackle at the cold bending test front and flexes of material, as a result closes completely
Lattice.By Fig. 4, welded seam area is observed in weld metal zone macroscopic test, and face of weld crackle, root crack, cross section crackle are all 0；
By Fig. 5, high power metallograph, the fusion transition effect of welding region and base material region are shot in weld the melting area of welding seam domain
Preferably, different metallographic structures interpenetrate, smooth transition.It is enough to illustrate the solderable better performances of this material.
The steel of embodiment 1-5 productions, are stretched, are impacted, cold bending test, the results are shown in Table 2 respectively.
2 test result data of table
High-strength steel sheet of the present invention stable components on chemical element not only have higher intensity in performance, also have good
Good plasticity and toughness and welding performance.The metallographic structure of this steel grade is acicular ferrite, granular bainite and a small amount of tempered martensite.
Acicular ferrite is the tissue for meeting great line energy and low welding crack sensitivity, can improve low-temperature flexibility, reduces weld crack
Sensibility ensure that steel grade has good cold molding and solderability；The presence of martensitic structure increases to a certain extent
The hardness of material, increases the drag to deformation, cracking and abrasion；Actually ferrite and the non-laminar of carbide mix bainite
It is combined and knits, increase intensity and the plasticity and toughness cooperation of material.And grain size is higher, improves the welding performance of material.According to
In the mechanical property of steel plate of the method for the present invention production in mechanical property yield strength can reach 750MPa or more, tensile strength can
To reach 850MPa, elongation percentage >=20%, the minimum reachable 90J or more of -20 DEG C of Charpy impact toughness ballistic works of steel grade, 180 degree is cold
Curved d=2a is qualified.
Welded seam area is observed by weld metal zone macroscopic test, face of weld crackle, root crack, cross section crackle are all 0；
High power metallograph is shot by weld the melting area of welding seam domain, weld seam integration region has an apparent line of demarcation, welding section
The fusion transition effect in domain and base material region is preferable, and different metallographic structures interpenetrates, smooth transition.Welded seam area weld seam-
20 DEG C of ballistic works can reach 80J or more, and the cold-bending property and joint toughness of welding are good.It is enough to illustrate that this material is solderable
Better performances.
Claims (7)
1. a kind of high intensity crane arm support steel, which is characterized in that the high intensity crane arm support steel contain with
Lower weight percent element：
C 0.050~0.080%, Si 0.15~0.25%, Mn 1.70~1.90%, P≤0.020%, S≤0.010%,
Als 0.020~0.060%, Cr 0.20~0.24%, Nb 0.06~0.08%, Mo 0.10~0.12%, Ti 0.11~
0.13%, surplus is Fe and inevitable impurity.
2. a kind of production method of high intensity crane arm support steel described in claim 1, which is characterized in that the production
Method and process flow is：Molten iron pretreatment → converter smelting → alloy finely tunes station → LF refining → continuous casting → strand heat treatment → control
It rolls and controls cold → smooth → crosscutting → finished product；Wherein, strand cold charge enters stove, and time inside furnace was controlled at 4-6 hours；Steel billet tapping temperature
It is controlled by 1250 DEG C.
3. production method according to claim 2, which is characterized in that base target thickness among coiled sheet：60±2mm.
4. production method according to claim 2, which is characterized in that it is 3+5 patterns, finishing mill seven that roughing mill, which depresses pattern,
Rack all comes into operation.
5. production method according to claim 4, which is characterized in that mm finishing mill unit reduction ratio uses equilibrium assignment pattern,
Increase the drafts of F3~F7 racks, finish rolling compression ratio is by 3.5 controls.
6. production method according to claim 2, which is characterized in that roller repairing uses full section section cooling pattern, cold
But speed control is in 30-40 DEG C/S.
7. production method according to claim 2, which is characterized in that at 1250 ± 20 DEG C, finish rolling is whole for soaking temperature control
Temperature control is rolled at 840 ± 20 DEG C, and oiler temperature control is at 550 ± 20 DEG C.
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Cited By (4)
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| CN110747401A (en) * | 2019-12-10 | 2020-02-04 | 马鞍山钢铁股份有限公司 | Pipeline steel hot-rolled steel strip with seawater erosion corrosion resistance and production method thereof |
| CN110923549A (en) * | 2019-12-10 | 2020-03-27 | 马鞍山钢铁股份有限公司 | 900 MPa-grade hot-rolled high-strength structural steel for crane boom and production method thereof |
| CN111254360A (en) * | 2020-03-30 | 2020-06-09 | 武汉钢铁有限公司 | Low-deformation-resistance high-strength steel and production method and application thereof |
| CN111748738A (en) * | 2020-06-28 | 2020-10-09 | 武汉钢铁有限公司 | High-strength thin steel plate and manufacturing method thereof |
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| CN111254360A (en) * | 2020-03-30 | 2020-06-09 | 武汉钢铁有限公司 | Low-deformation-resistance high-strength steel and production method and application thereof |
| CN111748738A (en) * | 2020-06-28 | 2020-10-09 | 武汉钢铁有限公司 | High-strength thin steel plate and manufacturing method thereof |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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Application publication date: 20181109 |