CN105695858B - Railroad frog high-carbon ultra high silicon bainitic steel and preparation method thereof - Google Patents
Railroad frog high-carbon ultra high silicon bainitic steel and preparation method thereof Download PDFInfo
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- CN105695858B CN105695858B CN201610092359.5A CN201610092359A CN105695858B CN 105695858 B CN105695858 B CN 105695858B CN 201610092359 A CN201610092359 A CN 201610092359A CN 105695858 B CN105695858 B CN 105695858B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 24
- 239000010703 silicon Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000005242 forging Methods 0.000 claims abstract description 35
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 6
- 238000000265 homogenisation Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000004080 punching Methods 0.000 claims abstract description 6
- 238000010583 slow cooling Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 3
- 229910001240 Maraging steel Inorganic materials 0.000 abstract description 12
- 230000009466 transformation Effects 0.000 abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000617 Mangalloy Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 210000001161 mammalian embryo Anatomy 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C22C38/06—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
Abstract
A kind of railroad frog high-carbon ultra high silicon bainitic steel, it is a kind of ultra-fine carbide-free Bainite tissue, and its chemical composition mass percent wt% is：C：0.68~0.72, Si：3.0~4.0, Mn：0.4~0.6, Cr：0.4~0.6, W：0.1~0.3, V：0.04‑0.06、Al：0.02 0.10, remaining is Fe and a small amount of impurity element.The preparation method of above-mentioned high-carbon ultra high silicon bainitic steel is mainly：Cast steel ingot is smelted, steel ingot is carried out dehydrogenation and microstructure homogenization is handled by slow cooling to room temperature in punching block, and the shaping of die forging steel ingot carries out bainitic transformation heat treatment to forging.The yield strength of high-carbon ultra high silicon bainitic steel prepared by the present invention is more than 1100MPa, and tensile strength is more than 1500MPa, and room temperature impact toughness is more than 100J/cm2, elongation percentage reaches 30%, fracture toughness (K1C) it is more than 60MPa.m‑1/2, especially strength and ductility product is up to 50GPa%, and the mechanical property of the high-carbon ultra high silicon bainitic steel of preparation has reached the level with intensity rank Maraging steel, but its cost is only about a thirtieth of Maraging steel.
Description
The invention belongs to Materials Science and Engineering field, more particularly to a kind of railroad frog steel and its system for technical field
Make method.
Background technology railway frog is to make wheel by path level-crossing equipment of one rail by another strand of rail, mainly
It is made up of wing rail, heart rail and connected component.According to structure, railway frog can be divided into fixed railway frog and active type railway frog.Fixed
Railway frog is divided into monoblock cast type and assembling-type railway frog again.Monoblock cast railway frog typically refers to potassium steel casting railway frog；And assembled rut
Fork is primarily referred to as, using pearlitic steel or potassium steel or bainitic steel as heart rail, using pearlitic steel or bainitic steel as wing rail, passing through
The railway frog that high-strength screw assembles.
At present, worldwide railroad frog steel has high-carbon pearlitic steel, high Mn austenitic steel and low-carbon bainite
Steel.United States Patent (USP) US2004035507-Al, Publication No. CN101818312A and CN03800576.X Chinese patent etc. are announced
The ultra-fine pearlite railway frog steel and its manufacturing process of many excellent combination properties.On high Mn austenitic steel railway frog and its manufacture
Technology has：Earliest high manganese steel frog is the rut being layed in for 1894 on the tramway of USA New York Brooklyn Atlantic Ocean street
Fork, constantly updated and developed later.1986《Railway Track and Structures》1 (82) 36-38 on publication
Article, U.S. patent Nos US4342593 and US6572713, and Chinese invention patent CN03128763.8,
CN103667888A, CN200810055383.7, CN200910227860.8, CN200910227858.0,
CN200910227859.5 etc..Bainite steel frog is railroad frog steel developed in recent years and its manufacturing technology,
But, although its later but related patented technology that comes out is very more.Earliest be 1986《Railway Gazette
International》On publication 142 (1986) 176-177 research report, followed by 1997《Railway Track&
Structures》12 (1997) 14-16 research report on publication.Followed by United States Patent (USP) US5759299, Canadian Patent
CA 2355868 and CA 2510512, European patent EP 0804623B1, Chinese patent CN98124899.3, CN8112095.4,
CN200610048109.8、CN200610012673.4、CN03150092.7、CN02157927.X、CN98112095.4、
CN200410068857.3, CN200510078257.X, CN200410068857.3, CN1721565A, CN1865482A and
The a variety of bainitic frog steel achievement reports of CN103789699A etc..At present, all railroad frog bainitic steel in the world
All it is low-carbon or middle carbon content, not with the patent and article of upper bainite steel making railroad frog and research report
Document report.
In the 1990s, angle of the famous railroad frog manufacturer-VAE companies of Austria from cost performance in the world
Consider, give the principle that should be followed when selection railroad frog steel and structure type.People are told, in low speed low load line
Pearlitic steel railway frog is selected on road, the railway frog selected successively with the increase of train running speed and axle weight is conventional cast with steel
High manganese steel frog, assembled bainite steel frog, blast pre-hardening high manganese steel frog, are finally when train running speed is very high, axle
Maraging steel railway frog is used in selection when weight is very big.That is, Maraging steel is classic manufacture railroad frog
Material.However, because, containing substantial amounts of precious metal Co, Mo, Ni etc., its manufacturing cost is very high, institute in Maraging steel
In fact, also always nobody utilizes martensite ag(e)ing steel making railway frog, therefore, to utilize martensite ag(e)ing steel making railway
Railway frog is also always a dream so far.
It is an object of the invention to provide a kind of cost is very low, comprehensive mechanical property enough reaches same intensity level for the content of the invention
The railroad frog of other Maraging steel level high-carbon ultra high silicon bainitic steel and preparation method thereof.
The railroad frog high-carbon ultra high silicon bainitic steel of the present invention, its tissue is a kind of ultra-fine carbide-free Bainite
Organize, its chemical composition mass percent (wt%) is：C：0.68~0.72, Si：3.0~4.0, Mn：0.4~0.6, Cr：0.4
~0.6, W：0.1~0.3, V：0.04-0.06、Al：0.02-0.10, remaining is Fe and a small amount of impurity element.
Above-mentioned railroad frog is as follows with the preparation method of high-carbon ultra high silicon bainitic frog steel：
(1) ingot casting：Using electric arc furnace smelting molten steel, LF stove refined molten steels, after in the pouring molten steel punching block of mentioned component
Slow cooling is to room temperature；
(2) dehydrogenation is carried out to step (1) steel ingot and microstructure homogenization is heat-treated：Heated first with 80-100 DEG C/h speed
To 600-650 DEG C, 10-12h is incubated, then 1000-1050 DEG C is heated to 120-150 DEG C/h speed, 4-6h is incubated, air cooling is arrived
Room temperature；
(3) the railroad frog heart rail of the shape and size by steel ingot die-forging forming for needed for：By the steel ingot of step (2) with
180-200 DEG C/h speed is heated to 600 DEG C of insulation samming 3-5h, is then heated to 1220 DEG C with 100-140 DEG C/h speed
Insulation 2-4h, 1190~1210 DEG C of initial forging temperature, 850-900 DEG C of final forging temperature, forging deformation compares 5-6；
(4) forging of step (3) is subjected to final heat treatment：Forging is heated to after 925-935 DEG C of austenitizing 2-3h
It is directly placed into isothermal 1-3h in 340-360 DEG C of salt bath to quench, is then placed in the stove that temperature is 280-300 DEG C after isothermal 1-2h,
Placement is cooled to room temperature in atmosphere, is heated to 300 DEG C~320 DEG C insulation 1-2h and carries out temper.
The reason for high-carbon ultra high silicon bainite steel frog has excellent properties：Silicone content is very high in steel, reaches 3.5wt%
Left and right, simultaneously containing very high carbon, reaches 0.7wt% or so.In bainitic transformation heat treatment process, so high silicon is effective
The precipitation of high-carbon steel carbide during higher temperature bainitic transformation is hindered, so as to be obtained in high-carbon steel carbon-free
The upper bainite tissue of compound.And because carbon content is very high in steel, the bainite ferrite lath thickness very little of acquisition, average thickness
Degree is in below 80nm, and this ultra-fine bainitic steel of nanometer has high intensity and high tenacity；Meanwhile, there is content in steel is about
20% retained austenite, and retained austenite contains more carbon and silicon, causes it to have high stability, is connect in rolling
Touch under pulsating stress effect, the retained austenite of this stabilization hinders the formation of fatigue crack, be passivated the tip of fatigue crack；Again
With reference to metallic alloying elements such as manganese appropriate in steel, chromium, vanadium, the quenching degree of steel is improved, it is ensured that whole compared with big cross section railway frog
The uniformity of body tissue and performance, so that the performance of this high-carbon ultra high silicon bainitic steel is very excellent.Performance is reached with strong
The level of rank Maraging steel is spent, and cost is only about a thirtieth of Maraging steel.
The present invention has the following advantages that compared with prior art：
1st, the performance of steel is very excellent, and the yield strength of the high-carbon ultra high silicon bainitic steel of preparation is more than 1100MPa, tension
Intensity is more than 1500MPa, and room temperature impact toughness is more than 100J/cm2, elongation percentage reaches 30%, fracture toughness (K1C) be more than
60MPa.m-1/2, especially strength and ductility product is up to 50GPa%, considerably beyond other any low-alloy steel levels, while having very well
Anti- high circumferential stress tired and low circumferential strain fatigue performance, every mechanical performance index exceedes now widely used bayesian
Body railway frog steel.
2nd, manufacturing cost is very low, and the mechanical property of the high-carbon ultra high silicon bainitic steel of preparation has been reached with intensity rank geneva
The level of body aged steel, but its cost is only about a thirtieth of Maraging steel.
Brief description of the drawings
Fig. 1 is high-carbon ultra high silicon bainitic steel electron microscope prepared by the embodiment of the present invention 1.
Embodiment
Embodiment 1
It is by chemical composition mass ratio (wt%)：C：0.68、Si：3.0、Mn：0.41、Cr：0.58、W：0.13、V：0.06、
Al：0.09, remaining is the raw material of Fe and a small amount of impurity element, using electric arc furnace smelting molten steel, then with LF stove refined molten steels, will
Slow cooling is to room temperature after in pouring molten steel punching block.Heating Steel Ingots are incubated by 12h to 610 DEG C with 80 DEG C/h firing rate first, with
120 DEG C/h speed is heated to air cooling after 1000 DEG C of insulation 6h and carries out dehydrogenation and microstructure homogenization heat treatment to room temperature.With 200
DEG C/Heating Steel Ingots to 600 DEG C of insulation samming 4.8h, are then heated to 1220 DEG C of insulations by h speed with 140 DEG C/h speed
2h, 1190 DEG C of initial forging temperature, 850 DEG C of final forging temperature, forging deformation compares 5.1, is railroad frog heart rail chi by steel ingot die-forging forming
It is very little, as shown in Figure 1；Forging is subjected to final heat treatment again, railroad frog forging embryo is heated to after 925 DEG C of austenitizing 3h directly
It is put into isothermal 1h in 360 DEG C of salt baths to quench, is then placed in the stove that temperature is 300 DEG C after isothermal 1h, placement is cooled down in atmosphere
To room temperature, it is heated to 320 DEG C of insulation 1h and carries out temper, high-carbon ultra high silicon bainite steel frog is made.
Structure observation and measuring mechanical property are carried out to the sampling of 30mm depths below forging surface, as shown in figure 1, this
High-carbon ultra high silicon bainite steel frog is organized as ultra-fine carbide-free Bainite tissue, and its strength and ductility product reaches 50.5GPa%, anti-
Tensile strength is 1555MPa, yield strength 1190MPa, impact flexibility 111J/cm2, elongation percentage 32.5%, fracture toughness (K1C)
64MPa·m-1/2, meanwhile, the performance with the tired and low circumferential strain fatigue of anti-high circumferential stress well, its comprehensive mechanical property
Reach the level of same intensity rank Maraging steel.
Embodiment 2
It is by chemical composition mass ratio (wt%)：C：0.71、Si：3.9、Mn：0.59、Cr：0.50、W：0.23、V：0.04、
Al：0.05, remaining is the raw material of Fe and a small amount of impurity element, using electric arc furnace smelting molten steel, then with LF stove refined molten steels, will
Slow cooling is to room temperature after in pouring molten steel punching block.Heating Steel Ingots are incubated by 10h to 650 DEG C with 90 DEG C/h firing rate first, with
135 DEG C/min speed is heated to air cooling after 1020 DEG C of insulation 5h and carries out dehydrogenation and microstructure homogenization heat treatment to room temperature；With 180
DEG C/h speed by Heating Steel Ingots to 600 DEG C of insulation samming 3h, 1220 DEG C of insulation 3h are then heated to 100 DEG C/h speed,
1210 DEG C of initial forging temperature, 900 DEG C of final forging temperature, forging deformation compares 5.5, is railroad frog heart rail size by steel ingot die-forging forming；
Forging is subjected to final heat treatment again, railroad frog forging embryo is heated to after 935 DEG C of austenitizing 2h be directly placed into 340 DEG C of salt baths
Middle isothermal 3h quenchings, are then placed in the stove that temperature is 280 DEG C after isothermal 2h, placement is cooled to room temperature in atmosphere, reheat
Temper is carried out to 300 DEG C of insulation 2h, high-carbon ultra high silicon bainite steel frog is made.
Structure observation and measuring mechanical property, this high-carbon ultra high silicon are carried out to the sampling of 30mm depths below forging surface
Bainite steel frog is organized as ultra-fine carbide-free Bainite tissue, and its strength and ductility product reaches that 52GPa%, tensile strength are
1584MPa, yield strength 1210MPa, impact flexibility 105J/cm2, elongation percentage 32.8%, fracture toughness (K1C)68MPa·m-1/2, meanwhile, the performance with the tired and low circumferential strain fatigue of anti-high circumferential stress well, its comprehensive mechanical property is reached with strong
Spend the level of rank Maraging steel.
Embodiment 3
It is by chemical composition (wt%)：C：0.70、Si：3.5、Mn：0.50、Cr：0.40、W：0.30、V：0.06、Al：
0.02, remaining is the raw material of Fe and a small amount of impurity element, using electric arc furnace smelting molten steel, then with LF stove refined molten steels, by steel
Slow cooling is to room temperature after in water cast punching block.Heating Steel Ingots are incubated by 11h to 630 DEG C with 100 DEG C/h firing rate first, with
150 DEG C/min speed is heated to air cooling after 1050 DEG C of insulation 5h and carries out dehydrogenation and microstructure homogenization heat treatment to room temperature.Then,
Then Heating Steel Ingots are heated to by 1220 DEG C of guarantors with 120 DEG C/h speed to 600 DEG C of insulation samming 4h with 190 DEG C/h speed
Warm 3h, 1200 DEG C of initial forging temperature, 880 DEG C of final forging temperature, forging deformation compares 5.5, is railroad frog heart rail by steel ingot die-forging forming
Size.Forging is subjected to final heat treatment again, is directly placed into after railroad frog forging embryo is heated into 930 DEG C of austenitizing 2.5h
Isothermal 2h is quenched in 350 DEG C of salt baths, is then placed in the stove that temperature is 290 DEG C after isothermal 2h, placement is cooled to room in atmosphere
Temperature, is heated to 300 DEG C of insulation 1.5h and carries out temper, high-carbon ultra high silicon bainite steel frog is made.
Structure observation and measuring mechanical property, this high-carbon ultra high silicon are carried out to the sampling of 30mm depths below forging surface
Bainite steel frog is organized as ultra-fine carbide-free Bainite tissue, and its strength and ductility product reaches that 50GPa%, tensile strength are
1552MPa, yield strength 1220MPa, impact flexibility 108J/cm2, elongation percentage 32%, fracture toughness (K1C)70MPa·m-1/2,
Meanwhile, the performance with the tired and low circumferential strain fatigue of anti-high circumferential stress well, its comprehensive mechanical property reaches same intensity level
The level of other Maraging steel.
Claims (1)
1. a kind of railroad frog preparation method of high-carbon ultra high silicon bainitic steel, railroad frog high-carbon ultra high silicon bayesian
Body steel is a kind of ultra-fine carbide-free Bainite tissue, and its chemical composition mass percent wt% is：C：0.68~0.72, Si：
3.0~4.0, Mn：0.4~0.6, Cr：0.4~0.6, W：0.1~0.3, V：0.04-0.06、Al：0.02-0.10, remaining is Fe
With a small amount of impurity element, it is characterised in that：
(1) ingot casting：Using electric arc furnace smelting molten steel, LF stove refined molten steels, by rear slow cooling in the pouring molten steel punching block of mentioned component
To room temperature；
(2) dehydrogenation is carried out to step (1) steel ingot and microstructure homogenization is heat-treated：It is heated to first with 80-100 DEG C/h speed
600-650 DEG C, 10-12h is incubated, then 1000-1050 DEG C is heated to 120-150 DEG C/h speed, 4-6h, air cooling to room is incubated
Temperature；
(3) the railroad frog heart rail of the shape and size by steel ingot die-forging forming for needed for：By the steel ingot of step (2) with 180-
200 DEG C/h speed is heated to 600 DEG C of insulation samming 3-5h, is then heated to 1220 DEG C of insulations with 100-140 DEG C/h speed
2-4h, 1190~1210 DEG C of initial forging temperature, 850-900 DEG C of final forging temperature, forging deformation compares 5-6；
(4) forging of step (3) is subjected to final heat treatment：Forging is heated to after 925-935 DEG C of austenitizing 2-3h directly
It is put into isothermal 1-3h in 340-360 DEG C of salt bath to quench, is then placed in the stove that temperature is 280-300 DEG C after isothermal 1-2h, places
Room temperature is cooled in atmosphere, is heated to 300 DEG C~320 DEG C insulation 1-2h and is carried out temper.
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| CN201610092359.5A CN105695858B (en) | 2016-02-19 | 2016-02-19 | Railroad frog high-carbon ultra high silicon bainitic steel and preparation method thereof |
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| CN105695858B true CN105695858B (en) | 2017-08-11 |
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| CN106521350A (en) * | 2016-11-21 | 2017-03-22 | 河北工业大学 | Preparation method of high-tenacity medium-and-high-carbon superfine bainite steel |
| CN109402336B (en) * | 2018-12-26 | 2020-08-11 | 河南理工大学 | Bainite quenching process for steel tape |
| CN109628837B (en) * | 2019-01-02 | 2020-11-13 | 北京科技大学 | Superfine bainite type bridge cable steel and preparation method thereof |
| CN113430459B (en) * | 2021-06-17 | 2022-05-17 | 燕山大学 | Vanadium microalloyed medium-carbon carbide-free bainite steel and preparation method thereof |
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| CN1166804C (en) * | 1998-12-07 | 2004-09-15 | 清华大学 | High-strength and high-toughness weldable air-cooled Hongkang bainite steel specially for railway frog |
| CN100357477C (en) * | 2005-07-06 | 2007-12-26 | 燕山大学 | Super bainite abrasion-resistant steel and its manuafcturing process |
| CN103898299B (en) * | 2014-04-04 | 2016-04-13 | 北京科技大学 | A kind of preparation method of 2400MPa level low cost nanometer bainitic steel |
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