CN108642382B - Weathering steel and empty track roof beam for iron - Google Patents
Weathering steel and empty track roof beam for iron Download PDFInfo
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- CN108642382B CN108642382B CN201810467868.0A CN201810467868A CN108642382B CN 108642382 B CN108642382 B CN 108642382B CN 201810467868 A CN201810467868 A CN 201810467868A CN 108642382 B CN108642382 B CN 108642382B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 34
- 229910000870 Weathering steel Inorganic materials 0.000 title abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 claims description 86
- 239000000463 material Substances 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 19
- 230000007797 corrosion Effects 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000003466 welding Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 230000000452 restraining effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 235000019219 chocolate Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 101150104740 nqrB gene Proteins 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/22—Tracks for railways with the vehicle suspended from rigid supporting rails
- E01B25/24—Supporting rails; Auxiliary balancing rails; Supports or connections for rails
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a weather-resistant steel and an empty iron track beam, which comprises the following components in percentage by weight: c:0.05-0.08%; si:0.35-0.45%; mn:1.45-1.55%; p:0.06-0.09%; s is less than or equal to 0.015 percent; cr: less than or equal to 0.4 percent; ni:0.15-0.2%; cu:0.25-0.3%; ti: less than or equal to 0.025 percent; and the balance of Fe, wherein the track beam comprises a walking panel and a guide panel, and the walking panel and the guide panel adopt the weather-resistant steel. The weathering steel has good mechanical properties, ideal corrosion resistance and manufacturing economy.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to weather-resistant steel.
Background
The air rail is a rail vehicle which is hung on an air rail to run, is used as a novel public transportation mode of light, medium and medium transportation, and is an essential component of an integrated, multi-mode and three-dimensional public transportation system.
The areas of China are wide, the climatic conditions of different geographic positions are quite different, the interior of the air rail is exposed to the atmosphere for a long time although the appearance of the air rail is painted, and the air rail is easy to be corroded by the atmosphere in wet areas or coastal areas, so that the design of the air rail of China needs to be selected according to different climatic environments to use weather-resistant steel or not.
Non-weather resistant steel material
For areas with good climatic conditions and low environmental humidity, materials exposed to the atmosphere are more easily corroded, non-weather-resistant steel materials can be adopted, the corrosion resistance is equivalent to that of ordinary Q345B, and in this case, the service life of the steel is equivalent to that of ordinary Q345B.
Short-term rust-proof material
The period from production to use of the general steel is longer, the time is shorter than 1 month, the time is longer than 1 year, and the empty iron track is constructed in outdoor construction. The steel material with short-term rust prevention capability is related to comprehensive factors such as chemical components, rolling technology, tissues, oxide scale and the like of the material, and needs to be further researched.
Weather-resistant steel material
The weather-resistant steel, also known as atmospheric corrosion-resistant steel, is widely applied to the fields of buildings, vehicles, containers, bridges and the like, and is a low alloy steel with good corrosion resistance in the atmosphere. Research at home and abroad shows that the weathering steel is exposed to the atmosphere for a long time, and a layer of compact and well-adhered oxidation product is generated on the surface of the weathering steel to isolate the steel matrix from external corrosive substances, so that the corrosion resistance of the weathering steel is remarkably improved. The weathering steel is used in three ways: bare use, coating use and rust layer stabilization treatment, wherein bare use is the best use mode of weathering steel, and other use modes can increase cost to a certain extent. The weather-resistant steel which is generally exposed in areas without serious atmospheric pollution or non-special damp can be corroded in the initial stage, but after about 3-10 years, the rust layer is gradually stable, the corrosion is greatly slowed down, and the appearance is chocolate.
For severe environments such as coastal areas, areas with higher annual humidity and the like, the existing weather-resistant steel materials (Q345 NQR2 and 09 CuPCrNi-A) can be adopted, the corrosion resistance is improved by more than 55% compared with the common Q345B, and in this case, the service life of the steel can be improved by more than 50% compared with the common Q345B in the aspect of corrosion resistance alone.
The material with mechanical properties meeting the requirement of construction of the track for the air iron and ideal corrosion resistance and economy is provided, and the structural design of the track beam for the air iron is further optimized, so that the material is a technical problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
Aiming at the problem that the mechanical property of the material meets the requirement of construction of the rail for the air iron and has ideal corrosion resistance and economy, the invention provides the weathering steel which has good mechanical properties and ideal corrosion resistance and manufacturing economy.
The technical means of the scheme is as follows, and the weather-resistant steel comprises the following components in percentage by weight:
C：0.05-0.08％；
Si：0.35-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：≤0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：≤0.025％；
the balance being Fe.
The further technical scheme is as follows:
preferably, the weight percentages of the components are as follows:
C：0.05-0.08％；
Si：0.4-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35-0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：0.01-0.02％；
the balance being Fe.
Preferably, the weight percentages of the components are as follows:
C：0.06％；
Si：0.4％；
Mn：1.48％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35％；
Ni：0.17％；
Cu：0.26％；
Ti：0.015％；
the balance being Fe.
Meanwhile, the scheme also provides a track beam for the empty iron, which comprises a walking panel and a guide panel, wherein the walking panel and the guide panel are made of the weather-resistant steel provided by any one of the above materials.
In the prior art, the walking panel is used as a supporting panel of the walking wheel of the air train and is used for realizing the restraint of the air train in the vertical direction; the guide panel is used as a support panel of the guide wheel of the air train and is used for restraining the air train in the width direction of the track beam. By adopting the scheme, the obtained track beam has good mechanical properties, and ideal corrosion resistance, weather resistance and manufacturing economy.
As the above-mentioned track beam for empty iron, further technical scheme is as follows:
the walking panel comprises a walking wheel supporting plate for supporting the empty iron walking wheel, a connecting rib, a reinforcing rib, a connecting rib and a connecting rib, wherein the lower end of the connecting rib is connected with the upper end of the walking wheel supporting plate, the upper end of the reinforcing rib is connected with the lower end of the walking wheel supporting plate, and the extending directions of the connecting rib and the reinforcing rib are along the extending direction of the walking wheel supporting plate;
in the vertical direction, the relative positions of the connecting ribs and the reinforcing ribs are staggered;
the connecting ribs and the guide panel are respectively provided with a bolt hole, the connecting panel further comprises connecting bolts, and the walking panel and the guide panel form a bolt connection relationship through a plurality of connecting bolts penetrating through the bolt holes.
In the prior art, considering the amount of materials and the rails Liang Chongliang, in the design of the track panel, it is generally adopted to provide the track panel with a running surface for the running wheels and a reinforcing rib for bending resistance and reinforcing the bottom of the running panel. Therefore, in this scheme, set as: on vertical direction, the relative position of connecting rib and stiffening rib staggers each other, simultaneously, all is provided with the bolt hole on connecting rib and the guide panel, and above-mentioned bolt hole is used for wearing to establish connecting bolt, realizes that walking panel and guide panel form bolted connection relation. The connecting rib on the walking panel is used as a connecting piece of the walking panel and the guide panel, after the walking panel and the guide panel are connected, a gap is reserved between the reinforcing rib and the connecting rib in the horizontal direction, the gap is used for adapting to the relative position of the walking wheel and the guide wheel on the empty iron, namely, the walking wheel is ensured to be positioned right above the reinforcing rib and to move along the reinforcing rib, and the guide wheel can be contacted with the inner side of the guide panel.
In the prior art, the guide panel is generally fixed on the bridge, and the walking panel generally realizes the position constraint in space only through the guide panel. In the scheme, the walking panel is connected with the guide panel through bolts, a specific walking panel is provided, when the walking panel is connected with the guide panel, the factors of mechanical property, corrosion resistance and the like of the rail beam caused by welding heat introduced by a traditional welding connection mode are avoided, so that the scheme has the characteristic of easily guaranteeing various design properties of the rail beam, and meanwhile, during assembly, the efficiency of realizing reliable bolt connection is higher than the efficiency of realizing reliable welding connection, so that the scheme also has the characteristic of being beneficial to improving the assembly efficiency of the rail beam; meanwhile, in the prior art, the travelling wheels which are commonly adopted are rigid wheels, and the travelling faces for supporting the travelling wheels are improved along with the design speed per hour of the empty iron and the design bearing capacity of the empty iron, and the travelling panel can be designed to have ideal wear resistance, but unavoidable wear still occurs in the practical use process.
Any one group of two bolt holes which are matched with each other to form the bolt connection relationship are at least one bar-shaped hole, and the length direction of the bar-shaped hole is along the length direction of the travelling wheel supporting plate. As a person skilled in the art, in the process of implementing the above bolting, two bolt holes are required for any one connecting bolt: one bolt hole is arranged on the connecting rib, the other bolt hole is arranged on the guide panel, and aiming at the bolt hole which is a strip-shaped hole, a single bolt hole can be arranged to accommodate a plurality of connecting bolts at the same time, and one bolt hole can also be arranged to accommodate only the connecting bolts. By adopting the scheme, the connecting bolt can meet the structural connection requirement by shearing in the use process, so that when the bolt pre-tightening is realized, the relative positions of the walking panel and the guide panel are ensured, the connecting bolt is not required to be installed to be pulled in high strength, namely, the strong extrusion between the guide panel and the connecting rib is not required to be realized through the connecting bolt, the length direction of the strip-shaped hole is limited to be along the length direction of the walking wheel supporting plate, when the four-season temperature difference change of the installation environment of the track beam is large, the form of the bolt hole can enable the guide panel and the connecting rib to move mutually in the length direction of the walking wheel supporting plate under the thermal deformation of the track beam, and the mutual movement can reduce or eliminate the stress caused by thermal expansion and cold contraction on the track beam, so that the stress of the track beam is favorable to be optimized.
As a specific implementation manner of the connecting bolt, the connecting bolt comprises a bolt part with one end provided with a head and a nut screwed on the bolt part, and the nut is positioned on one side of the connecting rib away from the guide panel. In the prior art, an air train is generally supported by two traveling panels: one of the walking panels provides a walking surface on the left side of the air train, the other walking panel provides a walking surface on the right side of the air train, and the two rail panels are also used for restraining guide wheels on the left side and the right side of the air train respectively. Meanwhile, the two walking panels generally have a gap for the hanger to pass through. After the installation of the connecting bolts is completed, the nuts in threaded connection with the bolt parts are located on the inner sides of the door-shaped space surrounded by the track beams, and therefore the threads on the connecting bolts can be protected through the door-shaped space to ensure that the connecting bolts can be detachable for a long time.
When the walking panel provides support for the air railway train, as the contact point between the walking panel and the walking wheel is positioned on the side surface of the connection point between the walking panel and the guide panel, the walking panel is equivalent to a cantilever beam, and the cantilever beam is used as a technical scheme capable of reducing the deformation of the walking panel in the use process under the condition of saving materials so as to ensure the dimensional stability of the track beam in the use process, and the air railway train further comprises a plurality of first reinforcing plates, wherein the first reinforcing plates are in a right-angle triangle plate shape, one right-angle side of each first reinforcing plate is connected with the bottom surface of the walking wheel supporting plate, the first reinforcing plates are positioned under the connecting ribs, the acute angle of the end part of one right-angle side is intersected with the reinforcing ribs, and the other right-angle side is positioned on one side of the connecting ribs far away from the reinforcing ribs;
the first reinforcing plates are sequentially arranged along the length direction of the travelling wheel supporting plate. In this scheme, the above first reinforcing plate is actually a road wheel supporting plate bending-resistant reinforcing member. The concrete connection mode of the first reinforcing plate can effectively reduce the stress of the connection position of the connection rib and the walking wheel supporting plate on the walking wheel supporting plate.
The technical scheme for reducing stress at the connection position of the connecting rib and the travelling wheel supporting plate on the connecting rib further comprises a plurality of second reinforcing plates, wherein the second reinforcing plates are in right-angle triangle plate shapes, one right-angle side of each second reinforcing plate is connected with one side, far away from the reinforcing rib, of the connecting rib, and the other right-angle side of each second reinforcing plate is connected with the upper surface of the travelling wheel supporting plate;
the second reinforcing plates are sequentially arranged along the length direction of the travelling wheel supporting plate.
As described above, in the technical scheme including the first reinforcing plate and the second reinforcing plate, in practice, the whole walking panel mainly includes these parts of walking wheel backup pad, stiffening rib, connecting rib, first reinforcing plate, second reinforcing plate, for guaranteeing the mechanical properties of walking panel, guarantee the manufacturing accuracy and the manufacturing efficiency of walking panel, set up to: the walking panel is of an integrated structure obtained by casting. In practice, the walking panel can also adopt a structural design of welding and splicing a plurality of plates, but the welding and splicing can bring subsequent heat treatment or unreliable performance, and meanwhile, the longer welding line also affects the preparation efficiency of the walking panel.
As a person skilled in the art, the above specific structural limitations of the track beam actually have the advantages as set forth above, and the specific structural design of the track beam actually set forth above may be implemented by other steels in the prior art instead of the weather resistant steel, and at the same time, the above-mentioned structural design advantages are also provided when implemented by other steels in the prior art.
For the reliability that does benefit to track beam mechanical properties, preferably set up to along the extending direction of track beam, arrange a plurality of connecting bolt setpoint in proper order, the polylith second reinforcing plate is arranged in proper order along the length direction of walking wheel backup pad simultaneously and is aimed at avoiding local stress concentration on this track beam, to the realization scheme that sets up bar second reinforcing plate above, when the bolt hole is the bar hole, set up to the second reinforcing plate on the deflector and the position of bar hole stagger each other on it, so, can avoid the dismouting that the second reinforcing plate influences connecting bolt at first, set up bolt hole etc. secondly still can avoid the second reinforcing plate to influence connecting bolt and deflector relative motion. Preferably, the number of the strip-shaped holes and the second reinforcing plates on the guide panel is multiple, and the second reinforcing plates are arranged between any two adjacent strip-shaped holes.
The invention has the following beneficial effects:
the lower yield limit of the weathering steel provided by the scheme can reach more than 350 megapascals; the tensile strength can reach more than 480 megapascals; the elongation is more than or equal to 24%; at 20 ℃, the impact absorption power is more than or equal to 120AKv/J; at 0 ℃, the impact absorption power is more than or equal to 120AKv/J; at-20 ℃, the impact absorption power is more than or equal to 90AKv/J; at-40 ℃, the impact absorption power is more than or equal to 60AKv/J; meanwhile, the welding crack sensitivity index value of the weathering steel is about 0.188, and the corrosion resistance index value is about 7.1; the weathering steel provided by the scheme not only has ideal mechanical property, welding property and corrosion resistance, but also has the ingredient proportion that the raw material cost is only 75-87% of that of the existing weathering steel Q345NQR 2.
In the track beam scheme provided by the invention, the obtained track beam has good mechanical properties, and ideal corrosion resistance, weather resistance and manufacturing economy.
Drawings
FIG. 1 is a schematic view of a construction of an embodiment of a rail beam for an empty iron according to the present invention;
fig. 2 is a schematic perspective view of a walking panel in a specific embodiment of a track beam for an iron blank according to the present invention;
fig. 3 is a side view of a walking panel in an embodiment of a track beam for an empty iron provided by the present invention.
Reference numerals in the drawings are respectively: 1. the walking panel, 11, walking backup pad, 2, connecting bolt, 3, guide panel, 4, stiffening rib, 5, connecting rib, 6, bolt hole, 7, first reinforcing plate, 8, second reinforcing plate.
Detailed Description
The present invention will be described in further detail with reference to examples, but the structure of the present invention is not limited to the following examples.
Example 1:
the weather-resistant steel comprises the following components in percentage by weight:
C：0.05-0.08％；
Si：0.35-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：≤0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：≤0.025％；
the balance being Fe.
The weight percentages of the weathering steel components provided in this example are shown in the following table:
the mechanical property data of the corresponding weathering steel are shown in the following table:
in the percentage weight table above, pcm=0.188 and i=7.1 were taken as the median value of the respective data ranges for the percentage weight of C, si, mn, P, cr, ni, cu, ti.
The mechanical properties are shown in the following table: pcm represents a weld crack sensitivity index, I represents a corrosion resistance index, reL represents a lower yield limit value, rm represents a tensile index, a represents an elongation, and AKv represents an impact absorption work. Meanwhile, the box girder of the empty iron track is manufactured by adopting the scheme, so that the cost of the box girder steel material is only 75-87% of that of the existing weathering steel Q345NQR 2.
As a person skilled in the art, the above description of the remainder being iron, should be understood to include iron and other unavoidable impurities due to the limitations of the prior art.
Example 2:
this example is further defined on the basis of example 1:
the weather-resistant steel comprises the following components in percentage by weight:
C：0.05-0.08％；
Si：0.4-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35-0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：0.01-0.02％；
the balance being Fe.
The weight percentages of the weathering steel components provided in this example are shown in the following table:
the mechanical property data of the corresponding weathering steel are shown in the following table:
in the percentage weight table above, pcm=0.189 and i=7.2 were taken as the median value of the respective data ranges by the percentage weight of C, si, mn, P, cr, ni, cu, ti.
The mechanical properties are shown in the following table: pcm represents a weld crack sensitivity index, I represents a corrosion resistance index, reL represents a lower yield limit value, rm represents a tensile index, a represents an elongation, and AKv represents an impact absorption work. Meanwhile, the box girder of the empty iron track is manufactured by adopting the scheme, so that the cost of the box girder steel material is only 78-83% of that of the existing weathering steel Q345NQR 2.
Example 3:
this example is further defined on the basis of example 1:
the weather-resistant steel comprises the following components in percentage by weight:
C：0.06％；
Si：0.4％；
Mn：1.48％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35％；
Ni：0.17％；
Cu：0.26％；
Ti：0.015％；
the balance being Fe.
The weight percentages of the weathering steel components provided in this example are shown in the following table:
the mechanical property data of the corresponding weathering steel are shown in the following table:
the mechanical properties are shown in the following table: reL denotes the lower yield limit, rm denotes the tensile index, a denotes the elongation, and AKv denotes the impact absorption work. Meanwhile, the box girder of the empty iron track is manufactured by adopting the scheme, so that the cost of the box girder steel material is 79-81% of that of the existing weathering steel Q345NQR 2.
Example 4:
this embodiment is further defined on the basis of any one of the above embodiments, as shown in fig. 1 to 3: the embodiment discloses a track beam for empty iron, including walking panel 1 and direction panel 3, the material of walking panel 1 and direction panel 3 is the weather resistant steel that the arbitrary embodiment provided.
In the prior art, the walking panel 1 is used as a supporting panel of an air train walking wheel and is used for realizing the constraint of the air train in the vertical direction; the guide panel 3 is used as a support panel of an air train guide wheel and is used for restraining the air train in the width direction of the track beam. By adopting the scheme, the obtained track beam has good mechanical properties, and ideal corrosion resistance, weather resistance and manufacturing economy.
Example 5:
this embodiment is further defined on the basis of embodiment 4, as shown in fig. 1 to 3: the walking panel 1 comprises a walking wheel supporting plate 11 for supporting the empty iron walking wheel, a connecting rib 5, a reinforcing rib 4, a connecting rib 5 and a reinforcing rib 4, wherein the lower end of the connecting rib 5 is connected with the upper end of the walking wheel supporting plate 11, the upper end of the reinforcing rib 4 is connected with the lower end of the walking wheel supporting plate 11, and the extending directions of the connecting rib 5 and the reinforcing rib 4 are along the extending direction of the walking wheel supporting plate 11;
in the vertical direction, the relative positions of the connecting rib 5 and the reinforcing rib 4 are staggered with each other;
the connecting ribs 5 and the guide panel 3 are respectively provided with a bolt hole 6, and the connecting panel further comprises connecting bolts 2, and the walking panel 1 and the guide panel 3 form a bolt connection relationship through a plurality of connecting bolts 2 penetrating through the bolt holes 6.
In the prior art, considering the amount of material and the track Liang Chongliang, in track panel design, it is common to use a track panel including a running panel 1 providing a running surface for running wheels and a reinforcement 4 serving as a bending resistance reinforcement for the bottom of the running panel 1. Therefore, in this scheme, set as: in the vertical direction, the relative position of connecting rib 5 and having strengthened 4 staggers each other, simultaneously, all is provided with bolt hole 6 on connecting rib 5 and the guide panel 3, and above-mentioned bolt hole 6 is used for wearing to establish connecting bolt 2, realizes that walking panel 1 and guide panel 3 form bolted connection. Namely, the connecting rib 5 on the walking panel 1 is used as a connecting piece of the walking panel 1 and the guide panel 3, after the walking panel 1 and the guide panel 3 are connected, a gap is reserved between the reinforced 4 and the connecting rib 5 in the horizontal direction, and the gap is used for adapting to the relative position of the walking wheel on the empty iron and the guide wheel, namely, the walking wheel is ensured to be positioned right above the reinforced 4 and can be contacted with the inner side of the guide panel 3 when the walking wheel moves along the reinforced 4.
In the prior art, the guide panel 3 is generally fixed on the bridge, and the walking panel 1 generally realizes the position constraint in the space only through the guide panel 3. In the scheme, the walking panel 1 is connected with the guide panel 3 through bolts, a specific walking panel 1 is provided, when the walking panel 1 is connected with the guide panel 3, the factors such as mechanical property and corrosion resistance of a track beam are avoided from being damaged by welding heat introduced by a traditional welding connection mode, so that the scheme has the characteristic of easily ensuring each design property of the track beam, and meanwhile, during assembly, the efficiency of realizing reliable bolt connection is higher than the efficiency of realizing reliable welding connection, so that the scheme is beneficial to improving the assembly efficiency of the track beam; meanwhile, in the prior art, the travelling wheel commonly adopted is a rigid wheel, and the travelling face for supporting the travelling wheel is provided with the characteristics that the travelling panel 1 is easy to maintain and the travelling panel 1 is fast to replace because the travelling wheel is not required to perform destructive operations such as hot cutting when the travelling panel 1 is replaced during the maintenance of the rail beam, and the travelling panel 1 can be designed to have ideal wear resistance along with the improvement of the design speed of the hollow iron and the increase of the design bearing capacity of the hollow iron.
Any one group of two bolt holes 6 which are matched with each other to form the bolt connection relationship, at least one bolt hole 6 is a strip-shaped hole, and the length direction of the strip-shaped hole is along the length direction of the travelling wheel supporting plate 11. As a person skilled in the art, in the process of achieving the above bolting, two bolt holes 6 are required for any one connecting bolt 2: one of the bolt holes 6 is provided on the connecting rib 5, the other bolt hole 6 is provided on the guide panel 3, and for the bolt hole 6 which is a bar-shaped hole, a single bolt hole 6 can be provided to accommodate a plurality of connecting bolts 2 at the same time, and also one bolt hole 6 can be provided to accommodate only the connecting bolts 2. By adopting the scheme, the connecting bolt 2 is sheared in the using process to meet the structural connection requirement, so that when the bolt pre-tightening is realized, the relative positions of the walking panel 1 and the guide panel 3 are ensured, the connecting bolt 2 is not required to be installed to be pulled in high strength, namely, the strong extrusion between the guide panel 3 and the connecting rib 5 is not required to be realized through the connecting bolt 2, the length direction of the strip-shaped hole is limited to be along the length direction of the walking wheel supporting plate 11, when the four-season temperature difference change of the installation environment of the track beam is large, the form of the bolt hole 6 can enable the guide panel 3 and the connecting rib 5 to move mutually in the length direction of the walking wheel supporting plate 11 under the thermal deformation of the track beam, and the stress caused by thermal expansion and cold contraction on the track beam can be reduced or eliminated, so that the stress of the track beam is favorable for optimization.
As a specific implementation of the connecting bolt 2, the connecting bolt 2 includes a bolt portion provided with a tip at one end and a nut screwed to the bolt portion, the nut being located on a side of the connecting rib 5 remote from the guide panel 3. In the prior art, an air train is generally supported by two traveling panels 1: one of the walking panels 1 provides a walking surface on the left side of the air train, the other walking panel 1 provides a walking surface on the right side of the air train, and the two rail panels are also used for restraining guide wheels on the left side and the right side of the air train respectively. Meanwhile, the two running panels 1 generally have a gap for the hanger to pass through. After the installation of each connecting bolt 2 is completed, the screw cap in threaded connection with the bolt part is positioned on the inner side of the door-shaped space surrounded by the track beam, so that the screw threads on the connecting bolts 2 can be protected through the door-shaped space to ensure that the connecting bolts 2 can be detachable for a long time.
When the walking panel 1 provides support for an air train, as the contact point between the walking panel 1 and the walking wheel is positioned on the side surface of the connection point between the walking panel 1 and the guide panel 3, the walking panel 1 is equivalent to a cantilever beam, and the technical scheme is that the deformation of the walking panel 1 in the use process can be reduced under the condition of saving materials so as to ensure the dimensional stability of the track beam in the use process, the air train further comprises a plurality of first reinforcing plates 7, wherein the first reinforcing plates 7 are in a right triangle plate shape, one right angle side of each first reinforcing plate 7 is connected with the bottom surface of the walking wheel supporting plate 11, the first reinforcing plate 7 is positioned under the connecting rib 5, the acute angle of the end part of one right angle side is intersected with the reinforcing rib 4, and the other right angle side is positioned on the side of the connecting rib 5 far from the reinforcing rib 4;
the plurality of first reinforcing plates 7 are sequentially arranged along the length direction of the traveling wheel supporting plate 11. In this solution, the above first reinforcement plate 7 is actually a bending-resistant reinforcement member of the road wheel support plate 11. The specific connection mode of the first reinforcing plate 7 can effectively reduce the stress of the connection position of the connection rib 5 on the walking wheel supporting plate 11 and the walking wheel supporting plate 11.
As a technical scheme capable of reducing stress at the connection position of the connecting rib 5 and the travelling wheel supporting plate 11 on the connecting rib 5, the novel road wheel supporting plate further comprises a plurality of second reinforcing plates 8, wherein the second reinforcing plates 8 are in right-angle triangle plate shapes, one right-angle side of each second reinforcing plate 8 is connected with one side, far away from the reinforcing plate 4, of the connecting rib 5, and the other right-angle side of each second reinforcing plate 8 is connected with the upper surface of the travelling wheel supporting plate 11;
the plurality of second reinforcing plates 8 are sequentially arranged along the length direction of the traveling wheel supporting plate 11.
As described above, in the technical solution including the first reinforcing plate 7 and the second reinforcing plate 8, in practice, the entire running panel 1 mainly includes the running wheel supporting plate 11, the reinforcing plate 4, the connecting rib 5, the first reinforcing plate 7, and the second reinforcing plate 8, and in order to ensure the mechanical properties of the running panel 1, and ensure the manufacturing accuracy and the manufacturing efficiency of the running panel 1, the following steps are set: the walking panel 1 is an integral structure obtained by casting. In practice, the running panel 1 may also adopt a structural design of welding and splicing multiple plates, but the welding and splicing may bring subsequent heat treatment or unreliable performance, and the longer welding seam also affects the manufacturing efficiency of the running panel 1.
As a person skilled in the art, the above specific structural limitations of the track beam actually have the advantages as set forth above, and the specific structural design of the track beam actually set forth above may be implemented by other steels in the prior art instead of the weather resistant steel, and at the same time, the above-mentioned structural design advantages are also provided when implemented by other steels in the prior art.
As a preference, for the reliability of the mechanical property of the track beam, it is preferable to set up to arrange a plurality of connecting bolt 2 set points in order along the extending direction of the track beam, and meanwhile, a plurality of second reinforcing plates 8 are arranged in order along the length direction of the travelling wheel supporting plate 11 to avoid local stress concentration on the track beam, aiming at the realization scheme of setting up the strip-shaped second reinforcing plates 8, when the bolt holes 6 are strip-shaped holes, the positions of the second reinforcing plates 8 arranged on the guide panel 3 and the strip-shaped holes on the second reinforcing plates are staggered, so that the second reinforcing plates 8 can be prevented from influencing the disassembly and assembly of the connecting bolts 2, the bolt holes 6 are arranged, and the like, and the second reinforcing plates 8 can be prevented from influencing the relative movement of the connecting bolts 2 and the guide panel 3. Preferably, the number of the strip-shaped holes and the second reinforcing plates 8 on the guide panel 3 is multiple, and the second reinforcing plates 8 are arranged between any two adjacent strip-shaped holes.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments, and it is not intended that the invention be limited to these descriptions. Other embodiments of the invention, which are apparent to those skilled in the art to which the invention pertains without departing from the technical solution of the invention, shall be covered by the protection scope of the corresponding invention.
Claims (7)
1. The utility model provides a track roof beam for sky iron, includes walking panel (1) and direction panel (3), its characterized in that, the material of walking panel (1) and direction panel (3) is a weather resistant steel, and the weight percent of its each component is as follows:
C：0.05-0.08％；
Si：0.35-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：≤0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：≤0.025％；
the balance of Fe;
the walking panel (1) comprises a walking wheel supporting plate (11) for supporting the empty iron walking wheel, a connecting rib (5) with the lower end connected with the upper end of the walking wheel supporting plate (11) and a reinforcing rib (4) with the upper end connected with the lower end of the walking wheel supporting plate (11), wherein the extending directions of the connecting rib (5) and the reinforcing rib (4) are along the extending direction of the walking wheel supporting plate (11);
in the vertical direction, the relative positions of the connecting ribs (5) and the reinforcing ribs (4) are staggered;
the connecting ribs (5) and the guide panel (3) are respectively provided with bolt holes (6), and the connecting device further comprises connecting bolts (2), wherein the walking panel (1) and the guide panel (3) form a bolt connection relationship through a plurality of connecting bolts (2) penetrating through the bolt holes (6);
any one group of two bolt holes (6) which are matched with each other to form the bolt connection relationship, at least one bolt hole (6) is a strip-shaped hole, and the length direction of the strip-shaped hole is along the length direction of the travelling wheel supporting plate (11).
2. The track beam for empty iron according to claim 1, wherein the weight percentages of the components are as follows:
C：0.05-0.08％；
Si：0.4-0.45％；
Mn：1.45-1.55％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35-0.4％；
Ni：0.15-0.2％；
Cu：0.25-0.3％；
Ti：0.01-0.02％；
the balance being Fe.
3. The track beam for empty iron according to claim 1, wherein the weight percentages of the components are as follows:
C：0.06％；
Si：0.4％；
Mn：1.48％；
P：0.06-0.09％；
S≤0.015％；
Cr：0.35％；
Ni：0.17％；
Cu：0.26％；
Ti：0.015％；
the balance being Fe.
4. A rail beam for free running iron according to claim 1, characterized in that the connecting bolt (2) comprises a bolt part provided with a head at one end and a nut screwed onto the bolt part, which nut is located on the side of the connecting rib (5) remote from the guide panel (3).
5. The track beam for the empty iron according to claim 1, further comprising a plurality of first reinforcing plates (7), wherein the first reinforcing plates (7) are in a right triangle plate shape, one right angle side of each first reinforcing plate (7) is connected with the bottom surface of the corresponding travelling wheel supporting plate (11), the first reinforcing plates (7) are positioned right below the connecting ribs (5), the acute angle of the end part of each right angle side is intersected with the corresponding reinforcing rib (4), and the other right angle side is positioned on one side, far away from the corresponding reinforcing rib (4), of the corresponding connecting rib (5);
the first reinforcing plates (7) are sequentially arranged along the length direction of the travelling wheel supporting plate (11).
6. The track beam for the empty iron according to claim 1, further comprising a plurality of second reinforcing plates (8), wherein the second reinforcing plates (8) are in a right triangle plate shape, one right angle side of the second reinforcing plates (8) is connected with one side of the connecting rib (5) away from the reinforcing rib (4), and the other right angle side of the second reinforcing plates (8) is connected with the upper surface of the travelling wheel supporting plate (11);
the second reinforcing plates (8) are sequentially distributed along the length direction of the travelling wheel supporting plate (11).
7. A rail beam for free iron according to claim 5 or 6, characterized in that the running panel (1) is of one-piece construction obtained by casting.
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| CN111119032A (en) * | 2020-01-17 | 2020-05-08 | 中铁二院工程集团有限责任公司 | Pier beam connecting device of suspension type air rail |
| CN115537662B (en) * | 2022-10-12 | 2023-07-25 | 重庆钢铁股份有限公司 | Normalizing Q345qD steel plate for air rail beam and manufacturing method thereof |
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