CN110306113B - Cast steel material for sliding shoe and casting method - Google Patents
Cast steel material for sliding shoe and casting method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
- C21C7/0685—Decarburising of stainless steel
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
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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
Abstract
The invention discloses a cast steel material for a sliding shoe and a casting method, wherein the cast steel material comprises the following formula components in percentage by weight: 0.35 to 0.45 percent of C, 0.45 to 0.7 percent of Mn0.25 to 0.6 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.9 to 1.4 percent of Cr0.25 to 0.35 percent of Mo0.3 to 1.8 percent of Ni1.3, less than or equal to 0.04 percent of Al, less than or equal to 0.25 percent of Cu, less than or equal to 0.1 percent of V, and the balance of Fe; the carbon equivalent is CE, and CE is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is less than or equal to 0.91 percent. On the premise of not increasing the cost, the contents of Mn, S, P, Cu and other elements are reduced as much as possible, and the mechanical property and the welding property of the material are ensured to the maximum extent so as to facilitate repair. Meanwhile, the alloy element Ni is added, the hardenability of the material is greatly improved, the content of the Mo element is properly increased, and the hardenability and the heat strength are improved.
Description
Technical Field
The invention relates to the technical field of alloy materials, in particular to a cast steel material for a sliding shoe and a casting method.
Background
The skid shoes are used as important core parts of the traveling mechanism shell, are the most important safety parts borne by the coal mining machine, bear the vertical action of the self gravity of the coal mining machine, and are also subjected to the action of dynamic torque when the coal mining machine is started and braked and irregular alternating stress generated by dynamic loads from different directions such as turning, unevenness, obstacles and the like in the traveling process, so that the stability, the safety and the maneuverability of the coal mining machine are influenced. Therefore, the sliding shoe can meet the strength requirement of the actual working condition by selecting a proper material or a proper process, and can keep high wear resistance under the severe wear condition, so that the method is an important way for realizing the efficient operation of the coal mining machine. The contact surface of the sliding shoe and the pin row is the most critical, and the sliding shoe not only requires high surface hardness and wear resistance, but also requires a considerable hardening layer depth to ensure the service life, so the sliding shoe has high requirement on the hardenability of a casting material.
Disclosure of Invention
The invention provides a cast steel material for a sliding shoe and a casting method.
In order to achieve the purpose, the invention provides the following technical scheme:
a cast steel material for sliding shoes comprises the following formula components in percentage by weight:
0.35 to 0.45 percent of C, 0.45 to 0.7 percent of Mn0.25 to 0.6 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.9 to 1.4 percent of Cr0.25 to 0.35 percent of Mo0.3 to 1.8 percent of Ni1.3, less than or equal to 0.04 percent of Al, less than or equal to 0.25 percent of Cu, less than or equal to 0.1 percent of V, and the balance of Fe;
the allowable deviation of chemical composition refers to the specification in GB/T222;
the carbon equivalent is CE, and CE is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is less than or equal to 0.91 percent.
The carbon content increases, the yield point and tensile strength of the steel increase, but the plasticity and impact properties decrease, and when the carbon content exceeds 0.23%, the weldability of the steel deteriorates, and therefore, low alloy structural steels for welding generally have a carbon content of not more than 0.20%. Meanwhile, the high carbon content can reduce the atmospheric corrosion resistance, and the high-carbon steel in an open-air stock yard is easy to rust. In addition, carbon can increase the cold brittleness and age sensitivity of the steel.
Silicon is used as a reducing agent and a deoxidizing agent in the steel making process, so the killed steel contains 0.15 to 0.30 percent of silicon. If the silicon content in the steel exceeds 0.50 to 0.60%, the alloying elements are not included. Silicon can significantly improve the elastic limit, yield point and tensile strength of steel, and is widely used as spring steel. 1.0-1.2% of silicon is added into the quenched and tempered structural steel, so that the strength can be improved by 15-20%. Silicon is combined with molybdenum, tungsten, chromium and the like, so that the corrosion resistance and the oxidation resistance are improved, and the heat-resistant steel can be manufactured. Low carbon steel containing 1-4% of silicon has very high magnetic permeability and is used as silicon steel sheet in electrical industry. At the same time, the amount of silicon increases, which may degrade the weldability of the steel.
The manganese is used as a good deoxidizer and desulfurizer in the steel-making process, and the manganese content in the steel is 0.30-0.50%. When more than 0.70 percent of manganese steel is added into carbon steel, compared with the steel with the common steel amount, the manganese steel has enough toughness, higher strength and hardness, the hardenability of the steel is improved, and the hot workability of the steel is improved, for example, the yield point of the 16Mn steel is 40 percent higher than that of A3. The steel containing 11-14% of manganese has extremely high wear resistance and is used for buckets of excavators, lining plates of ball mills and the like. Meanwhile, the manganese content is increased, the corrosion resistance of the steel is weakened, and the welding performance is reduced.
In general, phosphorus is a harmful element in steel, increases cold brittleness of steel, deteriorates welding properties, reduces plasticity, and deteriorates cold bending properties. Therefore, it is generally required that the phosphorus content in the steel is less than 0.045%, and the demand for high-quality steel is lower.
Sulfur is also a harmful element in general, and causes hot brittleness of steel, reduces ductility and toughness of steel, and causes cracks in forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance. Therefore, it is generally required that the sulfur content is less than 0.055% and the high-quality steel is less than 0.040%. Machinability is improved by adding 0.08-0.20% sulphur to the steel, commonly known as free-cutting steel.
Chromium can significantly improve strength, hardness and wear resistance, but at the same time reduces plasticity and toughness in structural and tool steels. Chromium can improve the oxidation resistance and corrosion resistance of steel, so that chromium is an important alloy element of stainless steel and heat-resistant steel. However, chromium significantly increases the brittle transition temperature of steel and promotes temper brittleness of steel.
The nickel can improve the strength of steel, maintain good plasticity and toughness, improve the processability and weldability of steel, greatly improve the hardenability of steel, and the chromium-nickel-molybdenum steel matched with chromium and molybdenum can obtain comprehensive mechanical properties with good matching of strength and toughness after heat treatment. The nickel has higher corrosion resistance to acid and alkali and has antirust and heat-resisting capabilities at high temperature. However, since nickel is a scarce resource, other alloy elements should be used as far as possible to replace nickel-chromium steel.
Molybdenum can refine the crystal grains of the steel, improve hardenability and heat strength, and maintain sufficient strength and creep resistance at high temperature. The addition of molybdenum to the structural steel improves the mechanical properties and also suppresses brittleness of the alloy steel due to tempering. The red color can be improved in the tool steel. The main adverse effect of molybdenum is its tendency to graphitize low alloy molybdenum steels.
Copper can improve the strength and toughness, especially atmospheric corrosion performance, and has the disadvantages that hot brittleness is easy to generate during hot processing, the plasticity is obviously reduced when the copper content exceeds 0.5 percent, and welding is not influenced when the copper content is less than 0.50 percent.
Aluminum is a commonly used deoxidizer in steel. A small amount of aluminum is added into the steel, so that the crystal grains can be refined, and the impact toughness can be improved, for example, 08Al steel used as deep drawing sheet. The aluminum also has oxidation resistance and corrosion resistance, and the combination of the aluminum, the chromium and the silicon can obviously improve the high-temperature non-peeling performance and the high-temperature corrosion resistance of the steel. Aluminum has the disadvantage of affecting the hot workability, weldability and machinability of the steel.
The vanadium has strong affinity with carbon, ammonia and oxygen, and is easy to form corresponding stable compounds. Vanadium is mainly present in steel in the form of carbides, and its main function is to refine the structure and grains of the steel, reducing the strength and toughness of the steel.
The cast steel material adopted by the prior sliding shoe is ZG42Cr1Mo, the chemical composition of the cast steel material is shown in Table 1, the mechanical property of the cast steel material is shown in Table 2, and the quenching curve of the cast steel material is shown in FIG. 3.
Table 1: chemical composition of ZG42Cr1Mo
The carbon equivalent CE, CE ═ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 of the steel is less than or equal to 0.83 percent.
Table 2: ZG42Cr1Mo mechanical property
The inventor analyzes to obtain: the content of S, P, Cu and other impurity elements in the ZG42Cr1Mo material does not reach the standard of high-quality steel (GB/T3077), and if the content of the impurity elements exceeds the standard, hot brittleness, cold brittleness and other phenomena of the material are easily caused, and the processing and heat treatment of parts are influenced. Based on the above influence factors, the inventor adjusts appropriate equivalent of alloy elements, so as to reduce carbon equivalent and greatly improve welding performance while ensuring better comprehensive strength. On the premise of not increasing the cost, the contents of Mn, S, P, Cu and other elements are reduced as much as possible, and the mechanical property and the welding property of the material are ensured to the maximum extent so as to facilitate repair. Meanwhile, the alloy element Ni is added, the hardenability of the material is greatly improved, the content of the Mo element is properly increased, and the hardenability and the heat strength are improved.
Preferably, the formula comprises the following components in percentage by weight:
0.39% of C, 0.5% of Mn0.38% of Si, 0.021% of P, 0.016% of S, 1% of Cr, 0.26% of Mo0.5% of Ni1.5%, 0.04% of Al, 0.05% of Cu0.02% of V and the balance of Fe.
In addition, the invention also provides a casting method of the cast steel material for the sliding shoe, which comprises the following steps:
s1, melting: adding the scrap steel into an electric arc furnace to be melted into molten steel, detecting the contents of nickel and molybdenum in a molten steel sample, and adding nickel and molybdenum alloys calculated according to the weight percentage;
s2, oxidation: blowing oxygen for decarburization, continuously discharging slag and making new slag in the decarburization process, sampling and detecting C, P content, and stopping blowing oxygen when the content of oxidized P is less than 0.01% and the content of C is 0.3-0.4%;
s3, decarburization: the method comprises the following steps of (1) transferring molten steel from an electric arc furnace to an AOD furnace for smelting by using a cradle, blowing oxygen for decarburization by using inert gas, adding aluminum alloy according to weight percentage, uniformly stirring, sampling and detecting the content of C, and stopping decarburization when the content of C is 0.35-0.42%;
s4, reduction: according to the weight percentage, manganese alloy, silicon alloy, chromium alloy and vanadium alloy are sequentially added, the mixture is uniformly stirred to obtain molten steel, and the molten steel is discharged from a furnace and stands in a bottom pouring steel ladle to be poured into a casting;
s5, heat treatment: and (3) sequentially carrying out high-temperature normalizing, primary tempering, quenching and secondary tempering on the casting to obtain the steel.
Preferably, in step S1, the chromium content in the scrap steel is not more than 0.30%, the copper content is not more than 0.20%, and the carbon content is more than 0.50%.
Preferably, in step S2, a pre-reduction treatment is performed after the oxidation in the electric arc furnace, when the temperature of the molten steel reaches more than 1580 ℃, the oxidized slag in the electric arc furnace is removed, 0.20-0.30% ferrosilicon is added to reduce and produce thin slag, and when the temperature reaches more than 1650 ℃, the slag is removed completely.
Preferably, in step S3, when the cradle is used to transfer the molten steel from the electric arc furnace to the AOD furnace for smelting, the cradle is baked for at least 1 hour, and the AOD furnace uses argon as the inert gas during decarburization.
Preferably, in step S4, before tapping molten steel, according to the molten steel detection result, the chemical composition of molten steel is adjusted according to the weight percentage of the formula components, and the tapping temperature of molten steel is 1600-.
Preferably, in step S5, the high-temperature normalizing temperature is 880-.
Preferably, the heating and heat-preserving time of the high-temperature normalizing and quenching is calculated according to the effective thickness of the casting piece of 0.5h/inch, and the heat-preserving time of the first tempering and the second tempering is 1.5-2 times of the heating and heat-preserving time of the high-temperature normalizing and quenching.
The invention has the beneficial effects that:
by adjusting the alloy elements with proper equivalent, the comprehensive strength is ensured to be better ensured, the carbon equivalent is reduced, and the welding performance is greatly improved. On the premise of not increasing the cost, the contents of Mn, S, P, Cu and other elements are reduced as much as possible, and the mechanical property and the welding property of the material are ensured to the maximum extent so as to facilitate repair. Meanwhile, the alloy element Ni is added, the hardenability of the material is greatly improved, the content of the Mo element is properly increased, and the hardenability and the heat strength are improved.
Drawings
FIG. 1 is a diagram of a metallographic structure of a casting, namely tempered sorbite, according to a first embodiment of the invention.
FIG. 2 is a quenching curve diagram of the prior-use cast steel material ZG42Cr1Mo for the slipper.
FIG. 3 is a graph of the quenching curve of the cast material in accordance with one embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a casting method of a casting steel material for a sliding shoe comprises the following steps:
firstly, 928Kg of dry, oil-free and rust-less Q235 steel plate (Cr0.28 percent and Cu0.06 percent) leftover material is selected and smelted in an electric arc furnace which is matched with the weight of parts (1 ton), when the scrap steel is smelted and the temperature is 1537 ℃, a sample No. 1 is taken, and then 0.5 percent of C, 0.25 percent of Ni0.08 percent of Mo0.035 percent of P, 13.5Kg of electrolytic nickel and 4Kg of FeMo60-A ferromolybdenum alloy are added.
And secondly, blowing oxygen for decarburization, continuously discharging slag and making new slag in the decarburization process, observing flame and furnace atmosphere, and taking a No. 2 sample to obtain 0.39% of C, 1.6% of Ni, 0.28% of Mos and 0.01% of P. When the temperature is measured to 1593 ℃, FeSi75A10.5-A ferrosilicon 3Kg alloy is added for pre-reduction, the temperature is continuously raised, and when the temperature reaches 1673 ℃, the slag is removed completely.
And thirdly, transferring the mixture into a shaking ladle which is required to have no residual steel and residue, and baking for 1.5 hours. Transferring the molten steel into a 1-ton AOD furnace, measuring the temperature at 1523 ℃, adding 6Kg of aluminum ingot, heating, blowing oxygen for decarburization with the ratio of O to Ar being 3:1, taking a No. 3 sample after blowing, and measuring C0.35%, Si 0.01%, Mn 0.15%, P0.015%, S0.013%, Cr0.17%, Ni 1.55%, Mo 0.25%, Cu 0.06% and V0.007%, wherein the content of C is at the lower limit, and the furnace body is declined to flow slag.
Adding 14Kg of FeMn78CO.2 ferromanganese, 5.5Kg of FeSi75A10.5-A ferrosilicon, 4.5Kg of FeCr55CO.25 ferrochrome and 21Kg of lime, shaking the furnace body and stirring for 5 minutes, pouring the furnace and measuring the temperature to 1633 ℃, taking a No. 4 sample, measuring C0.39%, Si 0.38%, Mn 1.15%, Cr 1.05%, Ni 1.5%, Mo 0.27%, P0.021%, S0.016% and Cu 0.06%, adding 0.5Kg of FeV50-A ferrovanadium, shaking the furnace body and stirring for 1 minute, taking a No. 5 sample, measuring C0.39%, Mn 0.5%, Si 0.38%, P0.021%, S0.016%, Cr 1%, Mo 0.26%, Ni 1.5%, Al 0.04%, Cu 0.05% and V0.02% and balancing Fe, tapping the steel to the bottom pouring area, measuring the temperature to 1587 ℃, aligning to the pouring area, pouring the pouring area, and standing the cast.
And finally, performing heat treatment on the casting by adopting a trolley type resistance furnace model RT3-1020-6, and specifically, sequentially performing high-temperature normalizing, primary tempering, cleaning, ultrasonic flaw detection, rough machining, quenching and tempering treatment (quenching and secondary tempering treatment), ultrasonic flaw detection, magnetic particle flaw detection, cleaning, rust prevention, packaging and warehousing on the casting. Wherein the high-temperature normalizing temperature is 880-: the special medium/oil is adopted, the secondary tempering temperature is 650 +/-10 ℃, the heat preservation time is 6 hours, the casting hardness requirement is 269-321HB, the heating and heat preservation time of the high-temperature normalizing and quenching is calculated according to the effective thickness of the casting by 0.5h/inch, the heating and heat preservation time of the primary tempering and the secondary tempering is 1.5-2 times of the heating and heat preservation time of the high-temperature normalizing and quenching when the heating and heat preservation time is less than 1 h.
The casting material prepared in this example was named XYZ-M2, and its mechanical properties are shown in Table 3. The XYZ-M2 material is subjected to heat treatment to obtain a metallographic structure of a casting, namely tempered sorbite, as shown in figure 1. The quenching curve is shown in fig. 3.
Table 3: XYZ-M2 mechanical property
Compared with the table 2, the cast steel material prepared by the embodiment has better mechanical property. That is, the present invention can improve both the weldability and the heat treatment property of the material while ensuring the strength and hardness.
As is evident from fig. 2 and 3: the hardenability of XYZ-M2 is obviously superior to that of ZG42Cr1Mo, so that the depth of a hardening layer can be well ensured, and the service life of the slipper is greatly prolonged.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The cast steel material for the sliding shoe is characterized by comprising the following formula components in percentage by weight:
0.35 to 0.45 percent of C, 0.45 to 0.7 percent of Mn0.25 to 0.6 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.9 to 1.4 percent of Cr0.25 to 0.35 percent of Mo0.3 to 1.8 percent of Ni1.3, less than or equal to 0.04 percent of Al, less than or equal to 0.25 percent of Cu, less than or equal to 0.1 percent of V, and the balance of Fe;
the carbon equivalent is CE, and CE is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15 is less than or equal to 0.91 percent;
the cast steel material for the sliding shoe is obtained by adopting the following casting method:
s1, melting: adding the scrap steel into an electric arc furnace to be melted into molten steel, detecting the contents of nickel and molybdenum in a molten steel sample, and adding nickel and molybdenum alloys calculated according to the weight percentage;
s2, oxidation: blowing oxygen for decarburization, continuously discharging slag and making new slag in the decarburization process, sampling and detecting C, P content, and stopping blowing oxygen when the content of oxidized P is less than 0.01% and the content of C is 0.3-0.4%;
s3, decarburization: the method comprises the following steps of (1) transferring molten steel from an electric arc furnace to an AOD furnace for smelting by using a cradle, blowing oxygen for decarburization by using inert gas, adding aluminum alloy according to weight percentage, uniformly stirring, sampling and detecting the content of C, and stopping decarburization when the content of C is 0.35-0.42%;
s4, reduction: according to the weight percentage, manganese alloy, silicon alloy, chromium alloy and vanadium alloy are sequentially added, the mixture is uniformly stirred to obtain molten steel, and the molten steel is discharged from a furnace and stands in a bottom pouring steel ladle to be poured into a casting;
s5, heat treatment: sequentially carrying out high-temperature normalizing, primary tempering, quenching and secondary tempering on the casting;
the high-temperature normalizing temperature is 880-.
2. The cast steel material according to claim 1, comprising the following formulation components in weight percent:
0.39% of C, 0.5% of Mn0.38% of Si, 0.021% of P, 0.016% of S, 1% of Cr, 0.26% of Mo0.5% of Ni1.5%, 0.04% of Al, 0.05% of Cu0.02% of V and the balance of Fe.
3. The cast steel material as claimed in claim 1 or 2, wherein in step S1, the chromium content in the scrap is not more than 0.30%, the copper content is not more than 0.20%, and the carbon content is more than 0.50%.
4. The cast steel material as claimed in claim 3, wherein in step S2, after the electric arc furnace is oxidized, the electric arc furnace is pre-reduced, when the temperature of the molten steel reaches more than 1580 ℃, the oxidized slag in the electric arc furnace is removed, 0.20-0.30% ferrosilicon is added to reduce and produce rarefied slag, and when the temperature reaches more than 1650 ℃, the slag is removed completely.
5. The cast steel material as claimed in claim 4, wherein, in step S3, the ladle is baked for at least 1 hour while the ladle is being used to transfer the molten steel from the electric arc furnace to the AOD furnace for smelting, and the AOD furnace is decarburized with argon as the inert gas.
6. The cast steel material as claimed in claim 5, wherein in step S4, the chemical composition of the molten steel is adjusted according to the weight percentage of the formulation components based on the result of the molten steel detection before tapping the molten steel, and the tapping temperature of the molten steel is 1600-.
7. The cast steel material as claimed in claim 6, wherein the holding time for the high-temperature normalizing and quenching is 1.5 to 2 times the holding time for the high-temperature normalizing and quenching, as calculated from 0.5h/inch of the effective thickness of the cast.
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|---|---|---|---|---|
| CN112458373B (en) * | 2020-11-26 | 2022-02-08 | 郑州煤机智能工作面科技有限公司 | Casting material for guide sliding shoes of coal mining machine and preparation method |
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