CN114622139A - Alloy steel and brake disc made of alloy steel - Google Patents
Alloy steel and brake disc made of alloy steel Download PDFInfo
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- CN114622139A CN114622139A CN202210262800.5A CN202210262800A CN114622139A CN 114622139 A CN114622139 A CN 114622139A CN 202210262800 A CN202210262800 A CN 202210262800A CN 114622139 A CN114622139 A CN 114622139A
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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
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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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
- C22C38/06—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
- C22C38/18—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
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/46—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides alloy steel and a brake disc made of the alloy steel. The alloy steel comprises the following components: c: 0.1-0.3%, Mn: 0.6-1.5%, Si: 0.85-1.6%, Cr: 0.4-1.2%, Ni: 0.5-1.3%, Mo: 0.5-1.6%, Nb: less than or equal to 0.2 percent, V: less than or equal to 0.4 percent, Cu: less than or equal to 0.3%, Al: less than or equal to 0.4 percent, and the balance of Fe and inevitable impurity elements, and the alloy steel has good high-temperature strength and thermal fatigue resistance; the invention also provides a brake disc prepared from the alloy steel, which can ensure better mechanical property under the condition of high-speed braking, has better thermal fatigue resistance, can reduce the propagation rate of fatigue cracks and the austenitizing tendency of material tissues, and has long service life and good abrasion resistance.
Description
Technical Field
The invention relates to the technical field of alloy, in particular to alloy steel and a brake disc made of the alloy steel.
Background
The brake disc of the high-speed train usually works under complex working conditions of strong friction, high heat load, larger braking force, centrifugal force and the like, and the working reliability of the brake disc almost determines the reliability level of the whole basic braking device, so that the driving safety of the train is directly influenced.
With the increase of the running speed of the train, the braking load and the heat energy are increased in a geometric grade, and an abnormal hot point is generated in a local area of a brake disc inevitably. The strength of the brake disc material is sharply reduced at high temperature, thermal fatigue is easily caused after repeated braking, and the fracture failure of the whole brake disc can be seriously caused. Therefore, good high temperature strength and thermal fatigue resistance are important criteria for the material selection of the brake disc.
At present, brake discs of domestic and foreign high-speed trains are mainly made of common quenched and tempered cast steel, the high-temperature strength and the thermal fatigue resistance of the brake discs are not enough, and related research and development work of brake discs with good high-temperature strength and thermal fatigue resistance is not seen so far. Therefore, in order to solve the problem that the high-temperature strength and the thermal fatigue resistance of the brake disc are insufficient at the higher running speed of the train, the alloy steel brake disc with good high-temperature strength and thermal fatigue resistance is needed to be provided.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to provide an alloy steel brake disc having good high temperature strength and thermal fatigue resistance, and a brake disc made thereof.
In order to achieve the above object, the present invention provides an alloy steel having a composition comprising, in mass%:
c: 0.1-0.3%, Mn: 0.6-1.5%, Si: 0.85-1.6%, Cr: 0.4-1.2%, Ni: 0.5-1.3%, Mo: 0.5-1.6%, Nb: less than or equal to 0.2 percent, V: less than or equal to 0.4 percent, Cu: less than or equal to 0.3 percent, Al: less than or equal to 0.4 percent, and the balance of Fe and inevitable impurity elements.
According to a specific embodiment of the present invention, preferably, the alloy steel further comprises, in mass percent: b: less than or equal to 0.03 percent.
According to a specific embodiment of the present invention, preferably, the alloy steel has a composition comprising, in mass percent:
c: 0.15-0.28%, Mn: 0.6-1.3%, Si: 0.9-1.5%, Cr: 0.5-1.1%, Ni: 0.6-1.2%, Mo: 0.5-1.4%, Nb: less than or equal to 0.2 percent, V: less than or equal to 0.4 percent, Cu: less than or equal to 0.3 percent, Al: less than or equal to 0.4 percent, B: less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.
According to a specific embodiment of the present invention, preferably, the alloy steel has a composition comprising, in mass percent: c: 0.22%, Mn: 0.84-0.85%, Si: 0.98-0.99%, Cr: 0.5%, Ni: 0.80-0.81%, Mo: 0.76 to 0.77%, Nb: 0.14-0.15%, V: 0.28-0.30%, Cu: 0.18-0.19%, Al: 0.03 percent, and the balance of Fe and inevitable impurity elements. More preferably, the composition of the alloy steel further comprises B: 0.003%.
The brake disc made of the alloy steel material has better thermal fatigue resistance and is beneficial to prolonging the service life of the brake disc by taking C-Mn-Si-Cr-Ni as the basis of alloy components, adding a proper amount of Mo, Nb and V elements, improving the high-temperature strength of the material by utilizing second-phase strengthening and fine-grain strengthening and improving the austenitizing temperature of the material by adjusting the content of Si, Nb, V, B and other elements.
In the invention, the properties of each element are as follows, wherein the contents are calculated by weight percent:
carbon element (b): can effectively improve the hardenability of steel, and is an essential element for ensuring the performances of the steel such as strength, hardness and the like. As the carbon content increases, the strength increases and the toughness decreases; when the carbon content is lower than 0.1%, the strength of the steel needs to be compensated by adding other alloy elements, but when the carbon content is higher than 0.3%, brittle cementite is easy to precipitate, and the toughness of the steel is not facilitated, so that the proper carbon content is 0.1-0.3%;
manganese element: the steel has obvious solid solution strengthening effect, the hardenability of steel grades is strongly improved, the wear resistance of alloy steel can be improved, and the heat strength and impact toughness of a matrix are improved, but the high manganese content has obvious segregation tendency and is not beneficial to toughness, so that the proper manganese content is 0.6-1.5%;
silicon element: plays a role of solid solution strengthening and can simultaneously increase the complete austenitizing temperature (Ac) of the steel grade3) The temperature is beneficial to the heat damage resistance of the steel grade; when the silicon content is less than 0.85%, the above effect is not significant, and when the content is more than 1.6%, fatigue property may be affected, and therefore, the silicon content is suitably 0.85 to 1.6%;
chromium and nickel elements: the hardenability of the steel can be increased, the strength, the wear resistance and the brittle fracture resistance of the steel can be improved, and the corrosion resistance of the steel can also be improved; when the chromium content is less than 0.4% and the nickel content is less than 0.5%, the above effect is not obvious, and when the chromium content is more than 1.2%, the Ac of the steel grade3The temperature can be obviously reduced, the thermal fatigue resistance is not facilitated, and when the nickel content is higher than 1.3%, the alloy cost is obviously increased, so that the proper chromium content is 0.4-1.2%, and the proper nickel content is 0.5-1.3%;
molybdenum element: the hardenability, the heat strength and the creep strength of the steel can be improved, the precipitation and the stability of second phase strengthening particles are promoted, the second phase strengthening particles are key elements for improving the high-temperature strength of the steel grade, and the atmospheric corrosion resistance of the steel grade can be improved, so that the proper molybdenum content is 0.5-1.6%;
niobium element: the steel has precipitation hardening and secondary hardening effects, can refine crystal grains, improve the creep resistance of the steel, increase the tempering stability, improve the strength and the impact toughness of the steel and reduce the ductile-brittle transition temperature; when the content of niobium is more than 0.2%, the related beneficial effects are basically stable, and the further increase effect is not obvious;
vanadium element: the high-strength steel has good precipitation strengthening effect, can refine crystal grains, improve the strength and toughness of steel, reduce the heat sensitivity of steel, increase the tempering stability of steel, have strong secondary hardening effect and improve the wear resistance of steel; when the content of vanadium is more than 0.4%, the related beneficial effects are basically stable, and the further increase effect is not obvious;
copper element: the precipitation strengthening effect can be generated during heat treatment, and the atmospheric corrosion resistance of the steel can be improved; in the alloy steel provided by the invention, the content of copper is controlled to be less than or equal to 0.3 percent;
aluminum element: has the functions of degassing and grain refinement; in the alloy steel provided by the invention, the content of aluminum is controlled to be less than or equal to 0.4 percent;
b element: the steel has extremely strong capacity of improving the hardenability and the corrosion resistance of the steel, and the strength and the hardness of the steel can be greatly improved; however, when the boron content is higher than 0.03%, the impact energy of the steel grade is seriously reduced, so that the boron content in the alloy steel provided by the invention is preferably controlled to be less than or equal to 0.03%.
The invention also provides a brake disc which is made of the alloy steel.
According to a particular embodiment of the invention, the brake disc is preferably manufactured by a casting process.
According to the specific embodiment of the invention, preferably, the brake disc obtained by casting is subjected to normalizing pretreatment and quenching and tempering treatment; more preferably, the normalizing pretreatment and the thermal refining treatment include:
keeping the temperature of the brake disc obtained by casting at 850 ℃ for 2h, and normalizing to room temperature;
heating the brake disc subjected to normalizing to 950 ℃, preserving the heat for 2 hours, and then quenching to room temperature;
and (3) heating the quenched brake disc to 650 ℃, tempering for 3 hours, and then air cooling to room temperature.
According to a particular embodiment of the invention, the brake disc is preferably a brake disc for rail transit vehicles.
According to the embodiment of the invention, the brake disc is preferably a brake disc for a high-speed train, and more preferably a brake disc for a high-speed train with the speed in the range of 350-440 km/h.
According to the specific technical scheme of the invention, the alloy steel provided by the invention can be smelted by adopting an alloy steel smelting process commonly used in the field, for example, an induction furnace smelting process and an electroslag remelting process, and the process parameters in the specific smelting process can also be determined according to the existing smelting process.
The smelting process of the induction furnace can comprise the following steps: charging (wherein, the furnace burden which is not easy to oxidize is directly charged into the electric furnace, and the furnace burden which is easy to oxidize is added in batches according to the process requirements in the smelting process), melting (the furnace burden is rapidly melted by using high power), refining (the furnace burden is refined by 30 percent of power), and discharging a cast steel ingot.
The electroslag remelting process can be carried out by adopting a single-phase water-cooled crystallization electroslag furnace, wherein the diameter of a crystallizer is 360mm, and the diameter of an electrode is 180 mm.
The qualified master alloy can be obtained by the smelting of an induction furnace and the electroslag remelting process, and the requirement of manufacturing a brake disc is met. The alloy prepared by the induction furnace and electroslag remelting has obviously improved quality, uniform components, basically no metallurgical defects such as shrinkage cavity, looseness and segregation and the like, the utilization rate of casting materials can reach more than 80 percent, and the performance of the alloy steel is improved.
After the master alloy of the present invention is prepared, the brake disc may be manufactured using a casting process commonly used in the art, for example, using the following casting process flow:
casting position design, parting surface design, shrinkage design, machining allowance design, casting system design, riser, chill and casting rib design, mold design and manufacture, molding, core manufacture, sand mold heating and casting.
After the alloy steel brake disc of the present invention is obtained by casting, the alloy steel heat treatment process commonly used in the art can be adopted, for example, the following normalizing pretreatment and quenching and tempering process flows are adopted:
keeping the temperature of the brake disc obtained by casting at 850 ℃ for 2h, and normalizing to room temperature;
heating the brake disc subjected to normalizing to 950 ℃, preserving the heat for 2 hours, and then quenching to room temperature;
and (3) heating the quenched brake disc to 650 ℃, tempering for 3 hours, and then air cooling to room temperature.
The key point of the invention is to provide an alloy steel for a brake disc and the brake disc manufactured by the alloy steel, and the smelting of the alloy steel and the manufacturing and heat treatment of the brake disc can be carried out according to the conventional processes in the field, for example, when the brake disc for a high-speed train is manufactured by using the cast alloy steel, the existing casting and heat treatment processes of the high-speed brake disc can be adopted.
When the brake disc works under complex working conditions of strong friction, high thermal load, larger braking force, centrifugal force and the like, the brake disc provided by the invention can meet the requirements of the working conditions on the safety performance of the brake disc, for example, when the brake disc is braked at the speed of 400km/h, the brake disc can stably and normally work, a more stable friction coefficient is kept, and the problem of thermal crack failure is avoided. Compared with other brake discs, the cast steel brake disc manufactured by the alloy steel provided by the invention has the following advantages:
1. better mechanical performance can be ensured under the condition of high-speed braking;
2. the material has better thermal fatigue resistance, can reduce the propagation rate of fatigue cracks and the austenitizing tendency of material tissues, and has longer service life;
3. has better abrasion resistance.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Alloy steels given in the following examples and comparative examples are obtained by smelting through an induction furnace and an electroslag remelting process provided by the invention and performing thermal treatment through a quenching and tempering process, and corresponding brake discs are manufactured through a casting process and are subjected to the following normalizing pretreatment and quenching and tempering process flows:
keeping the temperature of the brake disc obtained by casting at 850 ℃ for 2h, and normalizing to room temperature;
heating the brake disc subjected to normalizing to 950 ℃, preserving the heat for 2 hours, and then quenching to room temperature;
and heating the quenched brake disc to 650 ℃, tempering for 3 hours, and then cooling in air to room temperature.
Table 1 shows the composition (mass%) of the alloy steels of the following examples and comparative examples, and the balance being iron and inevitable impurity elements.
TABLE 1 composition and content (mass%,%) of alloy steels of examples and comparative examples
| C | Mn | Si | Cr | Ni | Mo | Nb | V | Cu | Al | B | |
| Example 1 | 0.22 | 0.84 | 0.98 | 0.50 | 0.81 | 0.76 | 0.14 | 0.30 | 0.19 | 0.03 | 0.003 |
| Example 2 | 0.22 | 0.85 | 0.99 | 0.50 | 0.80 | 0.77 | 0.15 | 0.28 | 0.18 | 0.03 | / |
| Comparative example 1 | 0.23 | 0.99 | 0.48 | 0.80 | 0.96 | 0.50 | 0.009 | 0.009 | 0.015 | 0.02 | / |
Test example 1
Mechanical property test
A standard tensile specimen was taken from the friction surface portion of the brake disk, and the mechanical properties at room temperature and the strength at 600 ℃ of the brake disk made of the alloy steels of examples 1-2 and comparative example 1 were measured by a universal tensile testing machine in accordance with GB/T228 "tensile test for metallic materials" and GB/T229 "method for testing Charpy pendulum impact for metallic materials", respectively, as shown in Table 2.
TABLE 2 mechanical properties of brake discs made of alloy steels of examples and comparative examples
As can be seen from Table 2, the brake disc made of the alloy steel of the present invention having good high temperature strength and thermal fatigue resistance has tensile strength R at room temperaturemMore than 1190MPa, yield strength Rp0.2More than 1100MPa, elongation A more than 11 percent and impact energy Akv2More than 75J, higher strength and good ductility and toughness, and higher high-temperature strength than that of the brake disc made of the alloy steel of the comparative example 1.
Test example 2
Complete austenitizing temperature test
A linear thermal expansion standard sample is taken from the friction surface part of the brake disc, and the complete austenitizing temperature of the brake disc made of the alloy steel of the embodiment 1-2 and the comparative example 1 is respectively measured by a linear thermal expansion tester according to GB/T4339 determination of thermal expansion characteristic parameters of metal materials.
TABLE 3 complete austenitizing temperature of brake discs of alloy steel composition of examples and comparative examples
| Complete austenitizing temperature Ac3/℃ | |
| Example 1 | 901 |
| Example 2 | 902 |
| Comparative example 1 | 842 |
As can be seen from Table 3, the brake disc made of the alloy steel with good high-temperature strength and thermal fatigue resistance of the invention has a complete austenitizing temperature of over 900 ℃, which is significantly higher than that of the brake disc made of the alloy steel of comparative example 1.
Test example 3
In this test example, the brake disc composed of the alloy steel of example 1 was used in a ratio of 1: 1 test of the brake power bench according to UIC541-3 related requirements:
test conditions 1: the diameter of a wheel is 890mm, the load of a brake disc is 4t, the pressure of a brake pad is 10.0kN multiplied by 2, the friction radius is 247, the initial braking speed is 440km/h, the actual braking distance is 7274m, the actual braking time is 119s, and the distance average friction coefficient of the brake disc is 0.334 measured by experiments.
Test condition 2: the diameter of a wheel is 890mm, the load of a brake disc is 4t, the pressure of a brake pad is 12.5kN multiplied by 2, the friction radius is 247, the initial braking speed is 440km/h, the actual braking distance is 6294m, the actual braking time is 103s, and the distance average friction coefficient of the brake disc is 0.352 measured by experiments.
The test result shows that the friction coefficient of the brake disc and the paired friction pair is stable, no hot spot and hot crack appear on the surface of the brake disc, and no obvious abrasion phenomenon exists.
Test example 4
In this test example, the brake disc composed of the alloy steel of example 1 and the brake disc composed of the alloy steel of comparative example 1 were used in a ratio of 1: 1 fatigue test by braking the power bench.
Test conditions are as follows: the diameter of a wheel is 890mm, the load of a brake disc is 4t, the pressure of a brake pad is 10kN multiplied by 2, the friction radius is 247, the initial braking speed is 440km/h, the cycle is 1000 times, and the brake disc abrasion is measured every 100 times.
TABLE 4 brake disc fatigue test wear loss of alloy steels of example 1 and comparative example 1
| Average wear/mm per 100 brakes | |
| Example 1 | 0.14 |
| Comparative example 1 | 0.17 |
From table 4, it can be seen that the brake disc made of the alloy steel of example 1 has a lower average wear loss and a longer service life than the brake disc made of the alloy steel of comparative example 1 under the same braking condition.
Claims (10)
1. An alloy steel, the composition of which comprises, in mass percent:
c: 0.1-0.3%, Mn: 0.6-1.5%, Si: 0.85-1.6%, Cr: 0.4-1.2%, Ni: 0.5-1.3%, Mo: 0.5-1.6%, Nb: less than or equal to 0.2 percent, V: less than or equal to 0.4 percent, Cu: less than or equal to 0.3 percent, Al: less than or equal to 0.4 percent, and the balance of Fe and inevitable impurity elements.
2. The alloy steel of claim 1, wherein the alloy steel composition further comprises, in mass percent: b: less than or equal to 0.03 percent.
3. The alloy steel according to claim 2, wherein the composition of the alloy steel comprises, in mass percent:
c: 0.15-0.28%, Mn: 0.6-1.3%, Si: 0.9-1.5%, Cr: 0.5-1.1%, Ni: 0.6-1.2%, Mo: 0.5-1.4%, Nb: less than or equal to 0.2%, V: less than or equal to 0.4 percent, Cu: less than or equal to 0.3 percent, Al: less than or equal to 0.4 percent, B: less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.
4. The alloy steel according to claim 3, wherein the composition of the alloy steel comprises, in mass percent:
c: 0.22%, Mn: 0.84-0.85%, Si: 0.98-0.99%, Cr: 0.5%, Ni: 0.80-0.81%, Mo: 0.76-0.77%, Nb: 0.14-0.15%, V: 0.28-0.30%, Cu: 0.18-0.19%, Al: 0.03 percent, and the balance of Fe and inevitable impurity elements;
preferably, the composition of the alloy steel further comprises B: 0.003%.
5. The alloy steel of claim 1, wherein the alloy steel is smelted using an induction furnace smelting process and an electroslag remelting process.
6. A brake disc made of the alloy steel according to any one of claims 1 to 5.
7. Brake disc according to claim 6, wherein it is manufactured by a casting process; preferably, the brake disc obtained by casting is subjected to normalizing pretreatment and quenching and tempering treatment; more preferably, the normalizing pretreatment and thermal refining treatment includes:
keeping the temperature of the brake disc obtained by casting at 850 ℃ for 2h, and normalizing to room temperature;
heating the brake disc subjected to normalizing to 950 ℃, preserving the heat for 2 hours, and then quenching to room temperature;
and (3) heating the quenched brake disc to 650 ℃, tempering for 3 hours, and then air cooling to room temperature.
8. Brake disc according to claim 6, wherein it is a brake disc for rail vehicles.
9. Disc according to claim 6, wherein it is a disc for high-speed trains.
10. Brake disc according to claim 9, wherein the disc is a high speed train disc with a speed in the range 350-440 km/h.
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| CN202210262800.5A CN114622139B (en) | 2022-03-17 | 2022-03-17 | Alloy steel and brake disc made of same |
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| CN202210262800.5A CN114622139B (en) | 2022-03-17 | 2022-03-17 | Alloy steel and brake disc made of same |
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| CN114622139B CN114622139B (en) | 2023-09-01 |
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| CN108048753A (en) * | 2017-12-20 | 2018-05-18 | 北京交通大学 | A kind of rail vehicle brake disc low-alloy steel and its heat treatment method |
| CN109385573A (en) * | 2018-11-19 | 2019-02-26 | 宁波金汇精密铸造有限公司 | Brake disc of high-speed train alloy cast steel material and preparation method thereof |
| CN111360198A (en) * | 2020-04-03 | 2020-07-03 | 北京机科国创轻量化科学研究院有限公司 | Cast steel for high-toughness cold-hot fatigue-resistant high-speed train brake disc and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101519754A (en) * | 2008-11-28 | 2009-09-02 | 北京纵横机电技术开发公司 | Alloy steel for braking discs |
| CN103510024A (en) * | 2012-06-28 | 2014-01-15 | 南车戚墅堰机车车辆工艺研究所有限公司 | Alloy cast steel for high speed train brake disc, heat treatment method thereof and high speed train brake disc manufactured by the alloy cast steel |
| CN108048753A (en) * | 2017-12-20 | 2018-05-18 | 北京交通大学 | A kind of rail vehicle brake disc low-alloy steel and its heat treatment method |
| CN112281080A (en) * | 2017-12-20 | 2021-01-29 | 北京交通大学 | Low alloy steel for railway vehicle brake disc and heat treatment method thereof |
| CN109385573A (en) * | 2018-11-19 | 2019-02-26 | 宁波金汇精密铸造有限公司 | Brake disc of high-speed train alloy cast steel material and preparation method thereof |
| CN111360198A (en) * | 2020-04-03 | 2020-07-03 | 北京机科国创轻量化科学研究院有限公司 | Cast steel for high-toughness cold-hot fatigue-resistant high-speed train brake disc and preparation method thereof |
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