CN106282754A - A kind of high-speed railway fastener casting method of low temperature resistant iron chair - Google Patents
A kind of high-speed railway fastener casting method of low temperature resistant iron chair Download PDFInfo
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- CN106282754A CN106282754A CN201610777449.8A CN201610777449A CN106282754A CN 106282754 A CN106282754 A CN 106282754A CN 201610777449 A CN201610777449 A CN 201610777449A CN 106282754 A CN106282754 A CN 106282754A
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- China
- Prior art keywords
- iron
- inovulant
- breed
- inoculation
- speed railway
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of high-speed railway fastener casting method with low temperature resistant iron chair, belong to casting technology field.The present invention includes melting, spheroidization and inoculation and casting, and melting raw material selects P: the pig iron of≤0.04%, S :≤0.03% and mild steel, the molten iron after melting through nodularization, breed after carry out cast molding after carry out heat treatment and i.e. obtain required iron chair；Mn≤0.3%, Si≤2.5%, remaining alloy total amount≤0.3% in molten iron；Breed in including breed, mould cavity inoculation and current-following inoculation breed for three times；The inovulant bred in bag uses granularity to be the silicon iron inoculator of 10mm ~ 20mm, and the inovulant of mould cavity inoculation uses granularity to be the silicon titanate innoculant of 1mm ~ 5mm, the silicon strontium inovulant that the inovulant of current-following inoculation uses granularity to be 0.2mm ~ 1mm.The present invention can increase ferrite quantity, improves low-temperature flexibility, promotes the shock resistance of iron chair further.
Description
Technical field
The present invention relates to casting technology field, more particularly, it relates to a kind of low temperature resistant iron chair of high-speed railway fastener
Casting method.
Background technology
High speed railway construction needs substantial amounts of fastener system, wherein non-fragment orbit fastener necessary casting iron chair every kilometer
Reaching nearly 3300, China region is wide, and relatively low at northern area much local winter temperatures, a lot of places are minimum to be reached
To the extremely low temperature of 40 degrees below zero, and some of China connect the cross-border railway of Russia, Mongolia, Korea etc., same place throughout the year
In low temperature environment.The iron chair using general casting method to prepare, there will be even brittle failure of ftractureing under cryogenic, this
The traffic safety of rail track will be badly influenced.
Summary of the invention
1. invention to solve the technical problem that
It is an object of the invention to the problem of iron chair Shortcomings in current high-speed railway fastener system that solves, it is provided that a kind of
The high-speed railway fastener casting method of low temperature resistant iron chair, is greatly improved the shock resistance of iron chair.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is:
A kind of high-speed railway fastener of present invention casting method of low temperature resistant iron chair, including melting, spheroidization and inoculation and casting,
Melting raw material select P: the pig iron of≤0.04%, S :≤0.03% and mild steel, the molten iron after melting through nodularization, breed after water
Carry out heat treatment after type casting moulding and i.e. obtain required iron chair；
Mn≤0.3%, Si≤2.5%, remaining alloy total amount≤0.3% in described molten iron；
Described breed include in breed, mould cavity inoculation and current-following inoculation breed for three times；The inovulant bred in bag uses granularity
For the silicon iron inoculator of 10mm ~ 20mm, the inovulant of mould cavity inoculation uses granularity to be the silicon titanate innoculant of 1mm ~ 5mm, pregnant with stream
The silicon strontium inovulant that the inovulant educated uses granularity to be 0.2mm ~ 1mm；
Molten iron tapping temperature is 1500 DEG C～1520 DEG C, and pouring temperature is 1400 DEG C ~ 1450 DEG C；
Described heat treatment uses process annealing to process, and heating-up temperature is 720 ± 20 DEG C, and temperature retention time 2 ~ 3 hours cools to the furnace
Come out of the stove for 600 DEG C.
Further, in described molten iron, the content of Mn is 0.2%.
Further, in described molten iron, the content of Si is 2.0%.
3. beneficial effect
The technical scheme using the present invention to provide, compared with prior art, has the advantages that
The present invention selects low-phosphorous, low-sulfur pig iron can reduce the existence due to phosphorus and form iron phosphide eutectic at grain boundaries, it is to avoid serious
Reducing cryogenic property, reducing sulfur content is for reducing the consumption to nodulizer, it is to avoid abnormal nodularizing；The chemical Composition Control of molten iron
Being the key producing low temperature resistant casting iron chair, chemical composition is defective, will result directly in the defective of cryogenic property, although manganese
Intensity can be increased to a certain extent, but manganese but can be greatly enhanced brittle transition temperature, and be easily formed microstructure segregation, increase
Adding black brittleness, alloy can promote structure refinement to a certain extent, but alloy but can make pearlite, and tendency is serious, more commonly
Magnesium iron, low alloy total amount can be avoided the formation of pearlite well, improve ferritic content, thus it is tough to improve low temperature
Property；Use and breed the quantity that can not only be greatly increased graphite nodule for three times, and energy crystal grain thinning, mould good graphite form,
Increase ferrite quantity, improve low-temperature flexibility；Carry out heat treatment, the shock resistance of iron chair can be promoted further.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
A kind of high-speed railway fastener of the present embodiment casting method of low temperature resistant iron chair, including melting, spheroidization and inoculation and water
Casting, melting raw material select P: the pig iron of≤0.04%, S :≤0.03% and mild steel, the molten iron after melting through nodularization, breed laggard
Carry out heat treatment after row cast molding and i.e. obtain required iron chair；
Mn≤0.3%, Si≤2.5%, remaining alloy total amount≤0.3% in above-mentioned molten iron；
Above-mentioned breed include in breed, mould cavity inoculation and current-following inoculation breed for three times；The inovulant bred in bag uses granularity
For the silicon iron inoculator of 10mm ~ 20mm, the inovulant of mould cavity inoculation uses granularity to be the silicon titanate innoculant of 1mm ~ 5mm, pregnant with stream
The silicon strontium inovulant that the inovulant educated uses granularity to be 0.2mm ~ 1mm；
Molten iron tapping temperature is 1500 DEG C～1520 DEG C, and pouring temperature is 1400 DEG C ~ 1450 DEG C；
Above-mentioned heat treatment uses process annealing to process, and heating-up temperature is 720 ± 20 DEG C, and temperature retention time 2 ~ 3 hours cools to the furnace
Come out of the stove for 600 DEG C.
As preferably, in above-mentioned molten iron, the content of Mn is 0.2%.
As preferably, in above-mentioned molten iron, the content of Si is 2.0%.
The present embodiment selection is low-phosphorous, low-sulfur pig iron can reduce the existence due to phosphorus and forms iron phosphide eutectic at grain boundaries, keeps away
Exempting from seriously to reduce cryogenic property, reducing sulfur content is for reducing the consumption to nodulizer, it is to avoid abnormal nodularizing；Low alloy total amount
The formation of pearlite can be avoided well, improve ferritic content, thus improve low-temperature flexibility；Use and breed not only for three times
Can be greatly increased the quantity of graphite nodule, and can crystal grain thinning, mould good graphite form, increase ferrite quantity, improve
Low-temperature flexibility；Carry out heat treatment, the shock resistance of iron chair can be promoted further.
Schematically being described the present invention and embodiment thereof above, this description does not has restricted, actual side
Method is not limited thereto.So, if those of ordinary skill in the art is enlightened by it, without departing from the invention objective
In the case of, design the frame mode similar to this technical scheme and embodiment without creative, all should belong to the present invention's
Protection domain.
Claims (3)
1. a high-speed railway fastener casting method for low temperature resistant iron chair, including melting, spheroidization and inoculation and casting, its feature
It is: melting raw material selects P: the pig iron of≤0.04%, S :≤0.03% and mild steel, and the molten iron after melting is after nodularization, breeding
Carry out heat treatment after carrying out cast molding and i.e. obtain required iron chair；
Mn≤0.3%, Si≤2.5%, remaining alloy total amount≤0.3% in described molten iron；
Described breed include in breed, mould cavity inoculation and current-following inoculation breed for three times；The inovulant bred in bag uses granularity
For the silicon iron inoculator of 10mm ~ 20mm, the inovulant of mould cavity inoculation uses granularity to be the silicon titanate innoculant of 1mm ~ 5mm, pregnant with stream
The silicon strontium inovulant that the inovulant educated uses granularity to be 0.2mm ~ 1mm；
Molten iron tapping temperature is 1500 DEG C～1520 DEG C, and pouring temperature is 1400 DEG C ~ 1450 DEG C；
Described heat treatment uses process annealing to process, and heating-up temperature is 720 ± 20 DEG C, and temperature retention time 2 ~ 3 hours cools to the furnace
Come out of the stove for 600 DEG C.
A kind of high-speed railway fastener the most according to claim 1 casting method of low temperature resistant iron chair, it is characterised in that:
In described molten iron, the content of Mn is 0.2%.
A kind of high-speed railway fastener the most according to claim 1 and 2 casting method of low temperature resistant iron chair, its feature exists
In: in described molten iron, the content of Si is 2.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610777449.8A CN106282754A (en) | 2016-08-31 | 2016-08-31 | A kind of high-speed railway fastener casting method of low temperature resistant iron chair |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610777449.8A CN106282754A (en) | 2016-08-31 | 2016-08-31 | A kind of high-speed railway fastener casting method of low temperature resistant iron chair |
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|---|---|
| CN106282754A true CN106282754A (en) | 2017-01-04 |
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| CN201610777449.8A Pending CN106282754A (en) | 2016-08-31 | 2016-08-31 | A kind of high-speed railway fastener casting method of low temperature resistant iron chair |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815584A (en) * | 2017-10-24 | 2018-03-20 | 建湖金洋科技有限公司 | A kind of iron chair for high ferro fastener and preparation method thereof |
| CN108624805A (en) * | 2018-07-16 | 2018-10-09 | 佛山市高明康得球铁有限公司 | A kind of heat-resisting spheroidal graphite cast-iron |
| CN110735087A (en) * | 2019-11-13 | 2020-01-31 | 宁夏全一机械设备研究院有限公司 | high-speed rail fastener production process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935505A (en) * | 2012-11-01 | 2013-02-20 | 中原利达铁路轨道技术发展有限公司 | Casting method of low temperature resistant iron cushion plate for high speed railway buckling part |
-
2016
- 2016-08-31 CN CN201610777449.8A patent/CN106282754A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102935505A (en) * | 2012-11-01 | 2013-02-20 | 中原利达铁路轨道技术发展有限公司 | Casting method of low temperature resistant iron cushion plate for high speed railway buckling part |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815584A (en) * | 2017-10-24 | 2018-03-20 | 建湖金洋科技有限公司 | A kind of iron chair for high ferro fastener and preparation method thereof |
| CN108624805A (en) * | 2018-07-16 | 2018-10-09 | 佛山市高明康得球铁有限公司 | A kind of heat-resisting spheroidal graphite cast-iron |
| CN110735087A (en) * | 2019-11-13 | 2020-01-31 | 宁夏全一机械设备研究院有限公司 | high-speed rail fastener production process |
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Application publication date: 20170104 |