CN104561829A - High-wear-resistant steel for railway frog and manufacturing method thereof - Google Patents
High-wear-resistant steel for railway frog and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 title abstract description 19
- 239000010959 steel Substances 0.000 title abstract description 19
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005242 forging Methods 0.000 claims abstract description 32
- 239000012535 impurity Substances 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000007669 thermal treatment Methods 0.000 claims abstract description 11
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 9
- 238000009847 ladle furnace Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- 238000004512 die casting Methods 0.000 claims abstract description 7
- 238000010891 electric arc Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 13
- 229910052758 niobium Inorganic materials 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims description 11
- 238000005496 tempering Methods 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 8
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000007872 degassing Methods 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 21
- 238000012360 testing method Methods 0.000 description 12
- 238000005275 alloying Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012913 prioritisation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000007550 Rockwell hardness test Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
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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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a high-strength wear-resistant steel particularly suitable for a railway frog and a manufacturing method thereof. The steel is prepared by the following components in percent by weight: 0.29-0.45% of C, 0.20-0.59% of Si, 0.90-1.51% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 1.52-1.79% of Cr, 1.01-1.49% of Ni, 0.29-0.59% of Mo, 0.02-0.07% of Al, 0.025-0.10% of Nb, greater than or equal to 0.05% and less than or equal to 0.15% of Nb + Al, less than or equal to 20 ppm of [O], less than or equal to 100 ppm of [N] and less than or equal to 0.50 ppm of [H], and the balance of iron and other unavoidable impurities. A manufacturing method for an alloy steel comprises the following steps: electric arc furnace smelting, ladle furnace refining, vacuum furnace degassing, die casting, blooming cogging, forging forming, dehydrogenation thermal treatment and final thermal treatment. Compared with the prior art, the alloy steel disclosed by the invention has the advantages that the strength is high, the wear resistance is excellent, the toughness is high, and the inner quality is stable and uniform.
Description
Technical field
The invention belongs to steel alloy and method field of manufacturing thereof, relate to a kind of high performance steel alloy, particularly relate to a kind of railroad frog highly wear-resisting alloy steel and manufacture method thereof, described steel alloy has very high strength property and excellent wear resisting property, there is very high toughness index simultaneously, and there is the stable and uniform advantage of inner quality, be specially adapted to high-speed overload railroad frog.
Background technology
High-speed overload railway is heavy with its macro-axis, the comfortable property of high-density and large conveying quantity constitutes extremely harsh operational conditions to track switch equipment, makes the wearing and tearing of the parts such as railway frog in track switch and hurt be far longer than common line same model track switch.Along with transportation by railroad further develops to heavy duty, the High Manganese Steel Frog of active service has more and more been difficult to meet its demand.For the railway frog (especially central body of frog and wing rail) that service condition is severe, not only need enough hardness and intensity, but also need enough toughness to improve its wear resistance, need whole railway frog section to have the uniformity consistency of performance and the stability of inner quality simultaneously.
For this reason, recently during the last ten years, all trying hard to develop the high-wearing feature alloy steel frog meeting high-speed overload transportation by railroad requirement both at home and abroad.Such as, CN100449027C discloses a kind of wear resisting steel being applicable to railway switch, Si-Mn-Cr-Mo is adopted to be main alloying element and to add V, Ti crystal grain thinning, manufacture have employed thermomechanical treatment process and improves the quality stability of railway frog to a certain extent and reduce production cost, but its hardness and impelling strength are not very superior.CN1166804C discloses the weldable air-cooled great health bainitic steel of the special superpower high-ductility of railroad frog and manufacture method thereof, it adopts with Mn, Si is main alloy element, be aided with Cr, Ni, the elements such as Mo, and with Ti, V, Nb is crystal grain thinning element, manufacture and have employed common smelting mode, but be Mn due to what adopt, Si is main adding elements, the segregation of Mn is inevitably there is in smelting process, thus cause the less stable of the uneven of cross section performance and inner quality, simultaneously due to the larger interpolation of Si, cause a large amount of oxidations of workpiece surface in forging and heat treatment process, thus waste material and add processing charges.
Summary of the invention
The object of the present invention is to provide a kind of railroad frog highly wear-resisting alloy steel, by multiple elements design adding techniques such as Mn, Cr, Ni, Mo, and be aided with Al, Nb crystal grain thinning, to obtain the wear resisting steel of a kind of high strength, high rigidity, high tenacity, be specially adapted to high-speed overload railroad frog.
Another object of the present invention is also the manufacture method providing a kind of described steel alloy, and by smelting, forging, heat treatment system control techniques, described manufacture method can ensure stability and the homogeneity of steel alloy internal performance quality of the present invention.
The object of the invention is to be achieved through the following technical solutions, a kind of railroad frog highly wear-resisting alloy steel, each component and mass percent as follows: C 0.29% ~ 0.45%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni 1.01% ~ 1.49%, Mo 0.29% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
According to prioritization scheme of the present invention, its each component and mass percent as follows:
(1) C 0.29% ~ 0.34%, Si 0.20% ~ 0.59%, Mn 1.01% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni 1.21% ~ 1.49%, Mo 0.35% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
(2) C 0.35% ~ 0.39%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni 1.01% ~ 1.49%, Mo 0.29% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
(3) C 0.40% ~ 0.45%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni 1.01% ~ 1.31%, Mo 0.29% ~ 0.49%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
The carbon content of wear-resisting alloy steel of the present invention is 0.29% ~ 0.45%, to ensure that steel alloy of the present invention has excellent hardness and strength property, has very high toughness and good welding property simultaneously.Alloying element Mn, Cr, Ni, Mo add and the selection of suitable proportioning, effectively can improve the intensity of described steel alloy, hardness and toughness properties further, and can ensure that whole part section can reach homogeneity and the consistence of structure and properties.Alloy element Al and Nb add and suitable proportioning is selected, then effectively can suppress Austenite Grain Growth in forging and heat treatment process, crystal grain thinning, improves the intensity of described steel alloy, plasticity and toughness.
The invention still further relates to the manufacture method of described heavy haul railway railway frog highly wear-resisting alloy steel, comprise the following steps of carrying out in order: electric arc furnace smelting → ladle furnace refining → vacuum oven is degassed → die casting → breaking down cogging → forging molding → dehydrogenation thermal treatment → finished heat treatment; Wherein forging molding should adopt flat-die forging+die forging mode, and finished heat treatment method should carry out controlled cooling model with 0.1 DEG C/s ~ 0.8 DEG C/s after austenitizing, to be cooled to after room temperature temper again.
Preferably, for the manufacture of 75Kg/m railway frog, finished heat treatment can adopt 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, speed of cooling at 0.3 DEG C/s ~ 0.5 DEG C/s, then 160 DEG C ~ 550 DEG C insulation tempering.
Preferably, for the manufacture of 60Kg/m railway frog, finished heat treatment can adopt 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, speed of cooling at 0.5 DEG C/s ~ 0.8 DEG C/s, then 160 DEG C ~ 550 DEG C insulation tempering.
Compared with prior art, railroad frog highly wear-resisting alloy steel one of the present invention adopts adding and the selection of suitable proportioning of C, Mn, Cr, Ni, Mo, Al, Nb, effectively raise the intensity of wear resisting steel, hardness and toughness properties, ensure that homogeneity and the consistence of whole part section structure and properties.Two is adopt smelting, forging and heat treated system control method, decreases the segregation of the alloying element of steel ingot, improves the homogeneity of forging cross section performance and the stability of inner quality.Railroad frog highly wear-resisting alloy steel mechanical performance index of the present invention is as follows: R
m>=1605MPa, R
p0.2>=1300MPa, hardness>=48HRC, α
kU(room temperature)>=100J/cm
2, α
kU(-40 DEG C)>=70J/cm
2.At present, the technical requirements of commercial alloy steel frog index of correlation (transports No. (2005) 230, baseline road file " alloy steel core rail assembled frog technical qualification "), R as follows
m>=1240MPa, α
kU(room temperature)>=70J/cm
2, α
kU(-40 DEG C)>=35J/cm
2, hardness is 38 ~ 45HRC.Choose typical commercial railway frog to test, its component and mass percent proportioning: C 0.25, Si 2.08, Mn 1.69, P 0.008, S 0.002, Cr 1.40, Ni 0.30, Mo 0.28, Al 0.03, Nb 0.01, O 18ppm, N 74ppm, H 0.39ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1263MPa, R
p0.2for 1020MPa, hardness is 39.5HRC ~ 42.0HRC, α
kU(room temperature) is 74J/cm
2, α
kU(-40 DEG C) are 37J/cm
2.As can be seen here, above-mentioned performance index have remarkable lifting by a relatively large margin than existing commercial railway frog.
In a word, steel alloy of the present invention has the performance of high strength, high rigidity, high tenacity, and the homogeneity of cross section performance and the good stability of inner quality, be specially adapted to the demand of high-speed overload railroad frog, and there is high work-ing life, be easy to manufacture, be easy to feature such as assembling use etc.
Describe the present invention below in conjunction with specific embodiment.Protection scope of the present invention is not limited with embodiment, but is limited by claim.
Embodiment
About of the present invention and technology contents, feature and effect, will describe in detail in the following specific embodiments.But it will be apparent to those skilled in the art that embodiment is herein only for example object, the present invention is not limited thereto.
In the present invention, the mensuration accepted standard of room temperature tensile properties is GB/T228-2002 " metallic substance tensile testing at ambient temperature ", the mensuration accepted standard of impact property is GB/T229-2007 " metallic substance Charpy pendulum impact test method ", the conversion method accepted standard of α KU is GB/T229-1984 " metal summer ratio (U-shaped breach) impact test method ", the mensuration accepted standard of hardness performance is GBT 230.1-2009 metallic substance Rockwell hardness test part 1: test method (A, B, C, D, E, F, G, H, K, N, T scale).
Railroad frog highly wear-resisting alloy steel of the present invention, it is a kind of high strength, high rigidity, the steel alloy of high tenacity, be specially adapted to high-speed overload railroad frog, its component and mass percent as follows: C 0.29% ~ 0.45%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni1.01% ~ 1.49%, Mo0.29% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
The manufacture method of described highly wear-resisting alloy steel, comprises the following steps of carrying out in order: electric arc furnace smelting → ladle furnace refining → vacuum oven is degassed → and die casting → breaking down cogging → forging molding → dehydrogenation thermal treatment → finished heat treatment; Wherein forging molding should adopt flat-die forging+die forging mode, and finished heat treatment method should be carried out controlled cooling model, be cooled to room temperature tempering at a certain temperature again with 0.1 DEG C/s ~ 0.8 DEG C/s after austenitizing.
In above-mentioned manufacturing process flow, each operation is specially:
Electric arc furnace smelting: by oxidation and reduction refining, remove P and S, degas, remove inclusion, controls adjustment chemical composition, obtains comparatively pure molten steel.
Ladle furnace refining: the pure molten steel obtained by electric arc furnace smelting is poured in ladle furnace, carries out refining, accurately controls chemical composition further, removes S and gas content.
Vacuum oven is degassed: the more pure molten steel adjusted through ladle furnace is poured in vacuum oven, oxygen blast under vacuo, decarburization, vacuum stripping, alloying constituent fine setting, the molten steel obtaining final purification and accurately control.
Die casting: pour in ingot shape by qualified pure molten steel, obtains the uniform of densification and the steel ingot that degree of segregation is little, for rolling is got ready.
Breaking down cogging: steel ingot die casting obtained carries out cogging, to ensure the homogeneity of steel ingot each several part and to reduce porousness, for forging molding is got ready.
Forging molding: after the steel billet of breaking down is carried out preliminary flat-die forging, and carry out final forging molding with die forging.
Dehydrogenation thermal treatment: the forging of forging molding is carried out dehydrogenation, greatly to improve the impelling strength of forging.
Finished heat treatment: the final thermal treatment forging after dehydrogenation thermal treatment being carried out structure and properties.
According to prioritization scheme, finished heat treatment usually should carry out controlled cooling model, need the tempering carrying out certain temperature after cooling with 0.1 DEG C/s ~ 0.8 DEG C/s after austenitizing.As manufactured the manufacture of 75Kg/m railway frog, finished heat treatment can adopt 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, speed of cooling at 0.3 DEG C/s ~ 0.5 DEG C/s, then 160 DEG C ~ 550 DEG C insulation tempering.And for the manufacture of 60Kg/m railway frog, finished heat treatment can adopt 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, speed of cooling at 0.5 DEG C/s ~ 0.8 DEG C/s, then 160 DEG C ~ 550 DEG C insulation tempering.
Embodiment 1: highly wear-resisting alloy steel of the present invention, its each component and mass percent proportioning: C 0.30, Si 0.52, Mn1.27, P 0.007, S 0.004, Cr 1.64, Ni 1.29, Mo 0.44, Al 0.07, Nb 0.04, O 18ppm, N 76ppm, H 0.36ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1685MPa, R
p0.2for 1367MPa, hardness is 51.5HRC, α
kU(room temperature) is 134J/cm
2, α
kU(-40 DEG C) are 92J/cm
2.
Embodiment 2: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.29, Si 0.45, Mn 1.51, P 0.006, S 0.006, Cr 1.67, Ni 1.47, Mo 0.41, Al 0.05, Nb 0.10, O 18ppm, N 79ppm, H 0.43ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1701MPa, R
p0.2for 1370MPa, hardness is 52.0HRC, α
kU(room temperature) is 112J/cm
2, α
kU(-40 DEG C) are 79J/cm
2.
Embodiment 3: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.38, Si 0.20, Mn 1.29, P 0.009, S 0.004, Cr 1.75, Ni 1.01, Mo 0.56, Al 0.07, Nb 0.08, O 15ppm, N 78ppm, H 0.42ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1723MPa, R
p0.2for 1384MPa, hardness is 52.5HRC, α
kU(room temperature) is 137J/cm
2, α
kU(-40 DEG C) are 93J/cm
2.
Embodiment 4: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.33, Si 0.59, Mn 1.01, P 0.009, S 0.001, Cr 1.61, Ni 1.22, Mo 0.57, Al 0.06, Nb 0.09O 20ppm, N 75ppm, H 0.46ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1719MPa, R
p0.2for 1377MPa, hardness is 52.5HRC, α
kU(room temperature) is 138J/cm
2, α
kU(-40 DEG C) are 94.5J/cm
2.
Embodiment 5: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.39, Si 0.21, Mn 1.36, P 0.008, S 0.004, Cr 1.72, Ni 1.21, Mo 0.29, Al 0.07, Nb 0.07, O 14ppm, N 77ppm, H 0.41ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1625MPa, R
p0.2for 1321MPa, hardness is 50.5HRC, α
kU(room temperature) is 145J/cm
2, α
kU(-40 DEG C) are 101J/cm
2.
Embodiment 6: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.29, Si 0.30, Mn 1.32, P 0.009, S 0.002, Cr 1.79, Ni 1.24, Mo 0.59, Al 0.02, Nb 0.03, O 20ppm, N 98ppm, H 0.35ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is as being R after testing
mfor 1653MPa, R
p0.2for 1331MPa, hardness is 51.0HRC, α
kU(room temperature) is 129J/cm
2, α
kU(-40 DEG C) are 88J/cm
2.
Embodiment 7: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.37, Si 0.39, Mn 1.17, P 0.007, S 0.003, Cr 1.54, Ni 1.26, Mo 0.36, Al 0.04, Nb 0.05, O 19ppm, N 65ppm, H 0.33ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1631MPa, R
p0.2for 1323MPa, hardness is 50.5HRC, α
kU(room temperature) is 141J/cm
2, α
kU(-40 DEG C) are 99J/cm
2.
Embodiment 8: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.38, Si 0.47, Mn 0.92, P 0.007, S 0.001, Cr 1.55, Ni 1.49, Mo 0.37, Al 0.06, Nb 0.06, O 16ppm, N 82ppm, H 0.41ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1709MPa, R
p0.2for 1374MPa, hardness is 52.0HRC, α
kU(room temperature) is 114J/cm
2, α
kU(-40 DEG C) are 83J/cm
2.
Embodiment 9: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.36, Si 0.41, Mn 1.34, P 0.008, S 0.002, Cr 1.52, Ni 1.08, Mo 0.47, Al 0.06, Nb 0.08, O 17ppm, N 98ppm, H 0.45ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1701MPa, R
p0.2for 1369MPa, hardness is 52.0HRC, α
kU(room temperature) is 119J/cm
2, α
kU(-40 DEG C) are 91J/cm
2.
Embodiment 10: heavy haul railway railway frog highly wear-resisting alloy steel, its each component and mass percent proportioning: C 0.45, Si 0.24, Mn 0.90, P 0.006, S 0.001, Cr 1.58, Ni 1.05, Mo 0.45, Al 0.07, Nb 0.03, O 16ppm, N 88ppm, H 0.35ppm, surplus is iron and other inevitable impurity.Its mechanical properties results is after testing: R
mfor 1629MPa, R
p0.2for 1321MPa, hardness is 50.5HRC, α
kU(room temperature) is 142J/cm
2, α
kU(-40 DEG C) are 103J/cm
2.
Embodiment 11: a kind of manufacture method of heavy haul railway railway frog highly wear-resisting alloy steel of high-intensity high-tenacity, manufacturing process flow is the following steps of carrying out in order: electric arc furnace smelting → ladle furnace refining → vacuum oven is degassed → die casting → breaking down cogging → forging molding → dehydrogenation thermal treatment → finished heat treatment.Wherein forging molding adopts flat-die forging+die forging.The thermal treatment process that dehydrogenation thermal treatment provides high tenacity to carry out for steel alloy.Finished heat treatment carries out controlled cooling model according to the difference of forging size and composition.Finished heat treatment usually carries out controlled cooling model with 0.1 DEG C/s ~ 0.8 DEG C/s, carries out the tempering of certain temperature after cooling after austenitizing.
Embodiment 12: for the manufacture of 75Kg/m railway frog, finished heat treatment adopts 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, and speed of cooling is at 0.3 DEG C/s ~ 0.5 DEG C/s; Then 160 DEG C ~ 550 DEG C insulation tempering.
Embodiment 13: for the manufacture of 60Kg/m railway frog, finished heat treatment adopts 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, and speed of cooling is at 0.5 DEG C/s ~ 0.8 DEG C/s; Then 160 DEG C ~ 550 DEG C insulation tempering.
The preferred embodiment of embodiment 14: one groups of high-speed overload railroad frog highly wear-resisting alloy steels, its component and mass percent proportioning as shown in the table.After tested, in this group embodiment, the mechanical performance index of highly wear-resisting alloy steel all can reach following requirement: R
m>=1605MPa, R
p0.2>=1300MPa, hardness>=48HRC, α
kU(room temperature)>=100J/cm
2, α
kU(-40 DEG C)>=70J/cm
2.
Claims (8)
1. a railroad frog highly wear-resisting alloy steel, it is characterized in that, each component and mass percent as follows: C 0.29% ~ 0.45%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr 1.52% ~ 1.79%, Ni 1.01% ~ 1.49%, Mo 0.29% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
2. highly wear-resisting alloy steel according to claim 1, it is characterized in that, each component and mass percent as follows: C 0.29% ~ 0.34%, Si 0.20% ~ 0.59%, Mn 1.01% ~ 1.51%, P≤0.015%, S≤0.010%, Cr1.52% ~ 1.79%, Ni 1.21% ~ 1.49%, Mo 0.35% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
3. highly wear-resisting alloy steel according to claim 1, it is characterized in that, each component and mass percent as follows: C 0.35% ~ 0.39%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr1.52% ~ 1.79%, Ni 1.01% ~ 1.49%, Mo 0.29% ~ 0.59%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
4. highly wear-resisting alloy steel according to claim 1, it is characterized in that, each component and mass percent as follows: C 0.40% ~ 0.45%, Si 0.20% ~ 0.59%, Mn 0.90% ~ 1.51%, P≤0.015%, S≤0.010%, Cr1.52% ~ 1.79%, Ni 1.01% ~ 1.31%, Mo 0.29% ~ 0.49%, Al 0.02% ~ 0.07%, Nb 0.025% ~ 0.10%, 0.05%≤Nb+Al≤0.15%, [O]≤20ppm, [N]≤100ppm, [H]≤0.50ppm, surplus is iron and other inevitable impurity.
5. the arbitrary highly wear-resisting alloy steel according to claim 1-4, is characterized in that, described highly wear-resisting alloy steel mechanical performance index is as follows: R
m>=1605MPa, R
p0.2>=1300MPa, hardness>=48HRC, α
kU(room temperature)>=100J/cm
2, α
kU(-40 DEG C)>=70J/cm
2.
6. the manufacture method of railroad frog highly wear-resisting alloy steel according to claim 1, it is characterized in that, described manufacture method comprises the following steps of carrying out in order: electric arc furnace smelting → ladle furnace refining → vacuum oven is degassed → and die casting → breaking down cogging → forging molding → dehydrogenation thermal treatment → finished heat treatment; Wherein forging molding adopts flat-die forging+die forging mode, and finished heat treatment method carries out controlled cooling model with 0.1 DEG C/s ~ 0.8 DEG C/s after austenitizing, to be cooled to after room temperature temper again.
7. the manufacture method of highly wear-resisting alloy steel according to claim 6, is characterized in that, for the manufacture of 75Kg/m railway frog, finished heat treatment adopts 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, and speed of cooling is at 0.3 DEG C/s ~ 0.5 DEG C/s; Then 160 DEG C ~ 550 DEG C insulation tempering.
8. the manufacture method of highly wear-resisting alloy steel according to claim 6, is characterized in that, for the manufacture of 60Kg/m railway frog, finished heat treatment adopts 890 DEG C ~ 980 DEG C laggard line spaces of austenitizing to be chilled to room temperature, and speed of cooling is at 0.5 DEG C/s ~ 0.8 DEG C/s; Then 160 DEG C ~ 550 DEG C insulation tempering.
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| WO2016107517A1 (en) * | 2014-12-30 | 2016-07-07 | 中车戚墅堰机车车辆工艺研究所有限公司 | High wear-resistant alloy steel for railway frog and manufacturing method therefor |
| CN114096693A (en) * | 2019-07-16 | 2022-02-25 | 安赛乐米塔尔公司 | Method for producing a steel component and steel component |
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| CN114082987B (en) * | 2021-10-14 | 2024-02-02 | 西安建筑科技大学 | Gradient structure design method for additive manufacturing of high manganese steel frog and railway steel rail |
| CN115233089B (en) * | 2022-05-16 | 2023-04-28 | 季华实验室 | Special steel for flexible gear and preparation process thereof |
| CN115652045B (en) * | 2022-08-26 | 2024-05-24 | 刘澄 | Preparation method of high-wear-resistance impact-resistant Fe-Cr-Mn-Si-Mo-C-N alloy crusher hammer |
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