CN108251763A - A kind of bullet train brake disc steel and preparation method thereof - Google Patents
A kind of bullet train brake disc steel and preparation method thereof Download PDFInfo
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- CN108251763A CN108251763A CN201810241202.3A CN201810241202A CN108251763A CN 108251763 A CN108251763 A CN 108251763A CN 201810241202 A CN201810241202 A CN 201810241202A CN 108251763 A CN108251763 A CN 108251763A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Braking Arrangements (AREA)
Abstract
The present invention relates to a kind of bullet train brake disc steel and preparation method thereof, belong to field of iron and steel.The creativeness of the present invention is to devise a kind of brake disc steel of suitable High Speed Train in China service condition, replacement imported material.It is produced using the technological process of intermediate frequency furnace melting-LF stoves refining-VD vacuum processings, ensure that the accurate control of chemical composition, and ensure that the cleanliness factor of molten steel.The steel is by casting, forging and heat treatment, oxygen content≤15ppm in product, nitrogen content≤90ppm, hydrogen content is less than or equal to 0.8ppm, grain size >=8 grade, field trash≤1.0 grade of all categories, yield strength >=500MPa, tensile strength >=600MPa, elongation percentage >=20%, 60 DEG C low temperature V-type ballistic work reach more than 40J.
Description
Technical field
The present invention relates to a kind of bullet train brake disc steel and preparation method thereof, belong to field of iron and steel.
Background technology
2017, High Speed Train in China mileage open to traffic accounted for world's bullet train mileage open to traffic already close to 30,000 kilometers
More than 60%, but on the critical component of bullet train, still using a large amount of imported material.Bullet train brake disc is high
The critical component of fast train, China has a vast territory, and north and south latitude span is big, and the bullet train operation meteorological condition to be undergone is answered
It is miscellaneous, high temperature and rainy weather and extremely cold weather are adapted to, the service condition of brake disc is extremely harsh, it is desirable that its material has higher bend
Have good low temperature impact properties while taking intensity again.The end of the year 2017, National Development and Reform Committee issue《Enhance manufacturing industry core
3 years action plans (2018-2020) of heart competitiveness》Major fields key technology industrialized implementation scheme, hair correct industry
(2017) No. 2063, some technologies requirement to following bullet train brake disc has been directed to it.Particular content is as follows：At a high speed
Each rank field trash≤1.5 grade of train brake disk steel, -60 DEG C of ballistic work >=27J, grain size >=7 grade.
The creativeness of the present invention is to devise a kind of brake disc steel of suitable High Speed Train in China service condition, substitute
Imported material.In order to improve its low temperature impact properties, the C element content in steel is reduced, adds in Ni elements, reduces impurity in steel
Element P, S content；In order to improve its intensity, solution strengthening is carried out to it using manganese element, the elements such as Nb, V, Al is added in and carries out crystalline substance
Grain refinement.It is produced using the technological process of intermediate frequency furnace melting-LF stoves refining-VD vacuum processings, ensure that the essence of chemical composition
Really control, and ensure that the cleanliness factor of molten steel.The steel is by casting, forging and is heat-treated, oxygen content≤15ppm in product, nitrogen
Content≤90ppm, hydrogen content be less than or equal to 0.8ppm, grain size >=8 grade, field trash≤1.0 grade of all categories, yield strength >=
500MPa, tensile strength >=600MPa, elongation percentage >=20%, -60 DEG C of low temperature V-type ballistic works reach more than 40J.
Invention content
Present invention aims at a kind of bullet train brake disc steel and preparation method thereof is provided, harsher clothes are adapted to
Labour condition substitutes imported material.
Above-mentioned bullet train brake disc steel, chemical composition are according to mass percent calculating：C 0.10%~
0.18%, Mn 1.20%~1.80%, Si 0.20%~0.40%, Ni 0.20%~0.50%, Cr<0.20%, Nb
0.03%~0.06, V 0.05%~0.15%, Mo<0.10%, P≤0.015%, S≤0.010%, Als >=0.020%, Cu
<0.20%, Ti≤0.02%, surplus Fe.
The preparation method of above-mentioned bullet train brake disc steel, it is characterised in that：
A) preparation process flow is：Intermediate frequency furnace smelting-LF refining-VD vacuum processings
B) intermediate frequency furnace is smelted：High-quality steel scrap and ingot iron is added in smelt, it is melting down after using fast spectral analysis chemistry into
Point, according to chemical composition analysis as a result, adding in appropriate Si iron, Mn iron, Ni alloys, adjustment Si, Mn, Ni element, which is entered into, to be set up separately
Range is counted, wherein more than median of the Mn elements according to design ingredient is controlled.Centainly it is noted that entering the quality of furnace charge, ensure P, Cu
Impurity elements is waited to be no more than setting range, C element ingredient controls below the median according to design ingredient.After reaching tapping temperature
It taps, aluminium ingot is put into molten steel according to the amount of 2kg/t steel in tapping process.
C) LF refining：LF refining slag according to molten steel amount 3%~8% supplying, the white slag retention time must be more than 20min with
On, must be white slag before tapping.15min before tapping sequentially adds Al lines, Nb iron, V iron, adjusts above-mentioned elemental composition and enters design
Range.Argon stirs, and optionally adds lime, by S contents control in steel below 0.010%.
D) VD vacuum processings：The effect of VD vacuum process is vacuum outgas and strong stirring removal of inclusions.VD is true
Steel oxygen content in water is reduced to vacancy reason 10ppm hereinafter, field trash meets design requirement, nitrogen content be reduced to 70ppm hereinafter,
Hydrogen content is reduced to below 0.6ppm.
Above-mentioned steel brake disc steel, after casting, forging and be heat-treated, product quality and mechanical property reach as
Lower index：
Gas content in steel：Oxygen content≤15ppm, nitrogen content≤90ppm, hydrogen content are less than or equal to 0.8ppm；Tissue and
Field trash：Grain size >=8 grade, field trash≤1.0 grade of all categories；Mechanical property：Yield strength >=500MPa, tensile strength >=
600MPa, elongation percentage >=20%, -60 DEG C of low temperature V-type ballistic works>40J.
Since China's high ferro development time is late, in current national standard, high ferro brake disk material is provided, state
Car (ordinary train) brake disc in family's standard is manufactured using grey cast-iron or vermicular cast iron, and surrender, tensile strength rank are
300MPa grades, elongation percentage >=1% does not claim to low temperature impact properties, it is difficult to adapt to the operating condition of High Speed Train in China.
All the time, high ferro brake disc uses import.The present invention substitutes cast iron materials from design of material angle, using steel alloy,
Using advanced smelting technique, the degree of purity of material ensure that, mechanical property has largely compared with the cast iron materials in national standard
Promotion, can meet China's high ferro service requirement, substitute import.
Specific embodiment
Embodiment 1
Intermediate frequency furnace is smelted.It is smelted using 20t intermediate frequency furnaces, intermediate frequency furnace lining material is MgO.Smelting process is：It adds in high-quality useless
Steel and ingot iron are smelted, and melting down rear fast spectral analysis chemical composition adds in Si iron, Mn iron, Ni alloys, adjusts Si, Mn, Ni
Element enters composition design range, and wherein Mn elements are controlled according to the middle upper limit.Centainly it is noted that entering the quality of furnace charge, guarantee P,
The impurity elements such as Cu are no more than setting range, and C element ingredient is controlled according to lower limit.It taps after reaching 1650 DEG C of tapping temperature,
Aluminium ingot is put into molten steel according to the amount of 2kg/t steel in tapping process.
LF refining.LF refining slag is incorporated according to the 3%~8% of molten steel amount, and the white slag retention time must be more than more than 20min,
It must be white slag before tapping.10min before tapping optionally sequentially adds Al lines, Nb iron, V iron, adjusts above-mentioned elemental composition entrance and sets
Count range.Argon stirs, and optionally adds lime, by S contents control in steel below 0.008%.LF stove tapping temperatures are
1660℃。
VD vacuum processings.After the tapping of LF stoves, ladle is hung in vacuum tank, connects argon gas, turn down argon flow amount, be closed tank
Lid starts to vacuumize.When vacuumizing, pay attention to observing ladle situation in tank in peep-hole, situation adjustment argon gas is seethed according to molten steel
Flow had both ensured the abundant degassing of molten steel, ensured outside molten steel and clinker not splash to ladle again.When vacuum degree reaches 67Pa
Start timing, keep more than 12min, then stop pumping, breaking vacuum.Vacuum opens cover after abolishing, and is added in molten steel face
Heat preserving agent charring rice husk carries out soft blow, and argon flow amount adjustment does not reveal molten steel with top of the slag fine motion to be advisable, and the soft blow time is more than 15min.
Thermometric, temperature drop to 1570 DEG C of bull ladle cast.
Using ordinary sand casting, modifier treatment (1050 DEG C of quenchings, 600 DEG C of tempering), machining, test are carried out after forging
Gas content in steel detects its tissue and field trash and tests its mechanical property, test result：Oxygen content in steel 12ppm, nitrogen contain
60ppm, H content 0.5ppm are measured, all kinds of inclusion behaviors are 0.5 grade in steel, and grain size is 8 grades, yield strength 600MPa,
Tensile strength 750MPa, elongation percentage 25%, V-type low-temperature impact work 53J at -60 DEG C.
Claims (2)
1. a kind of bullet train brake disc steel, which is characterized in that its chemical composition is calculated according to mass percent is：C
0.10%~0.18%, Mn 1.20%~1.80%, Si 0.20%~0.40%, Ni 0.20%~0.50%, Cr<
0.20%, Nb 0.03%~0.06, V 0.05%~0.15%, Mo<0.10%, P≤0.015%, S≤0.010%, Als >=
0.020%, Cu<0.20%, Ti≤0.02%, surplus Fe；The steel is after casting, forging and be heat-treated, and oxygen contains in product
Amount≤15ppm, nitrogen content≤90ppm, hydrogen content be less than or equal to 0.8ppm, grain size >=8 grade, field trash≤1.0 grade of all categories,
Yield strength >=500MPa, tensile strength >=600MPa, elongation percentage >=20%, -60 DEG C of low temperature V-type ballistic works reach more than 40J.
2. a kind of preparation method of bullet train brake disc steel as described in claim 1, which is characterized in that using intermediate frequency furnace
The technological process production of melting-LF stoves refining-VD vacuum processings, the specific steps are：
A) intermediate frequency furnace is smelted：It adds in high-quality steel scrap and ingot iron is smelted, fast spectral analysis chemical composition, root are used after melting down
According to chemical composition analysis as a result, adding in appropriate Si iron, Mn iron, Ni alloys, adjustment Si, Mn, Ni element enters composition design model
It encloses, wherein more than median of the Mn elements according to design ingredient controls；Centainly it is noted that entering the quality of furnace charge, ensure that P, Cu etc. are miscellaneous
Prime element is no more than setting range, and C element ingredient is controlled below the median according to design ingredient, gone out after reaching tapping temperature
Steel puts into aluminium ingot into molten steel in tapping process according to the amount of 2kg/t steel；
B) LF refining：LF refining slag is incorporated according to the 3%~8% of molten steel amount, and the white slag retention time must be more than more than 20min, go out
It must be white slag before steel；15min before tapping sequentially adds Al lines, Nb iron, V iron, adjusts above-mentioned elemental composition and enters scope of design,
Argon stirs, and optionally adds lime, by S contents control in steel below 0.010%；
C) VD vacuum processings：The effect of VD vacuum process is vacuum outgas and strong stirring removal of inclusions.At VD vacuum
Steel oxygen content in water is reduced to 10ppm hereinafter, field trash meets design requirement by reason, and nitrogen content is reduced to 70ppm hereinafter, hydrogen contains
Amount is reduced to below 0.6ppm；
D) bullet train brake disc steel is obtained after casting, forging and be heat-treated.
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| CN201810241202.3A CN108251763B (en) | 2018-03-22 | 2018-03-22 | A kind of bullet train brake disc steel and preparation method thereof |
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| CN201810241202.3A CN108251763B (en) | 2018-03-22 | 2018-03-22 | A kind of bullet train brake disc steel and preparation method thereof |
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| CN108251763B CN108251763B (en) | 2019-11-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182910A (en) * | 2018-10-20 | 2019-01-11 | 江苏铸鸿锻造有限公司 | A kind of carbon manganese steel forging circle of low-temperature impact-resistant and preparation method thereof |
| CN110899329A (en) * | 2019-10-25 | 2020-03-24 | 邯郸钢铁集团有限责任公司 | Method for producing brake pad back steel based on CSP continuous casting and rolling production line |
| CN114182061A (en) * | 2021-10-22 | 2022-03-15 | 南京钢铁股份有限公司 | Smelting method of steel for high-speed rail brake disc |
| CN114411046A (en) * | 2022-01-19 | 2022-04-29 | 丹阳市曙光新材料科技有限公司 | Process for smelting high-speed steel by using intermediate frequency furnace-LF furnace-VD furnace |
| CN115505853A (en) * | 2022-10-26 | 2022-12-23 | 本钢板材股份有限公司 | Square steel for high-speed rail brake and preparation method thereof |
| CN115558869A (en) * | 2022-09-27 | 2023-01-03 | 首钢京唐钢铁联合有限责任公司 | Steel for automobile brake noise damping sheet and preparation method thereof |
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| CN115558869A (en) * | 2022-09-27 | 2023-01-03 | 首钢京唐钢铁联合有限责任公司 | Steel for automobile brake noise damping sheet and preparation method thereof |
| CN115558869B (en) * | 2022-09-27 | 2023-09-15 | 首钢京唐钢铁联合有限责任公司 | Steel for automobile brake silencing sheet and preparation method thereof |
| CN115505853A (en) * | 2022-10-26 | 2022-12-23 | 本钢板材股份有限公司 | Square steel for high-speed rail brake and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN108251763B (en) | 2019-11-05 |
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