38 results about "Castability" patented technology

The invention discloses a method for improving castability of a high-purity industrial pure iron small square billet production line. The method comprises the following steps of KR molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting. According to the method, in the early stage of LF, oxidizing slag is used for removing manganese and phosphorus, in the later stage, slagging-off modification treatment is carried out, a minimum LF and minimum outbound oxygen formula is formulated, so that the RH carbon-oxygen reaction requirement is met, vacuum natural decarburization is used, RH end point carbon can be stably controlled to be 0.0007-0.001%, after RH aluminum is added for deoxidation, a calcium deoxidizing agent is added under the low-true-degree condition for inclusion denaturation, and the RH carbon-oxygen reaction requirement is met. By means of the method, continuous production can be achieved on an industrial pure iron small square billet production line, the finished product C is smaller than or equal to 0.0015%, Mn is smaller than or equal to 0.025%, P is smaller than or equal to 0.003%, S is smaller than or equal to 0.003%, the high industrial level can be achieved, the number of continuous casting furnaces is larger than or equal to 7, and the method is particularly suitable for producing pure iron on a production line without RH top lance equipment in the RH procedure.

The invention discloses a method for improving castability of aluminum-containing steel in a continuous casting process, which comprises the following steps of: S1, controlling components of molten steel, and accurately controlling the content of acid-soluble aluminum in molten steel of a continuous casting ladle to be 0.020-0.060% according to mass percent; s2, calcium treatment is conducted on the molten steel, and the calcium-aluminum ratio is controlled to range from 0.10 to 0.15; s3, continuous casting process control is conducted, specifically, the superheat degree of tundish molten steel is stably controlled to range from 15 DEG C to 30 DEG C, meanwhile, constant pulling speed operation is adopted, and the pulling speed fluctuation range is controlled within + / -0.1 m / min; and S4, the content of SiO in the casting powder is reduced to be smaller than or equal to 20%, and meanwhile, the alkalinity R of the casting powder is 1.5-2.0. The continuous casting process is ensured to be smooth, nozzle nodulation and casting blank surface defects are effectively prevented, and the production efficiency and the product quality are remarkably improved.

The invention discloses a continuous casting submersed nozzle for improving castability of rare earth steel, the continuous casting submersed nozzle comprises a nozzle body, a slag line and an inner hole body, the inner hole body is a ZrO2-CaO-C material, the raw material of the inner hole body is calcium zirconate and graphite, and the inner hole body material comprises the following components in percentage by weight: 45-59% of ZrO2, 18-22% of CaO, 20-32% of C and the balance of inevitable impurities. According to the method, the problems of nodulation and blockage of the submersed nozzle in the continuous casting production process of the rare earth steel and reaming caused by poor corrosion resistance in use can be effectively relieved, the castability of the rare earth steel under multi-furnace continuous casting can be ensured, and the method is beneficial to improving the quality of a casting blank and realizing efficient and stable production of continuous casting.

The invention relates to the field of steel smelting, and discloses a smelting method of low-carbon, low-manganese, low-sulfur and low-phosphorus steel. Comprising the following steps: S1, molten iron pretreatment; s2, primary slagging in a converter; s3, secondary slagging of the converter; s4, converter end point control; s5, converter tapping and steel ladle slag charge adding; s6, LF slagging; s7, molten steel slagging-off; s8, LF heating is conducted; and S9, RH vacuum treatment is conducted. According to the method, a mode of pre-adding slag charge during tapping, stirring for demanganization after LF mild temperature compensation, dephosphorization, slagging-off and LF temperature rising is adopted, the manganese return amount and the phosphorus return amount are small, the top slag oxidability is weak, the continuous casting castability is high, and the steel defect is remarkably reduced.

A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.

The present application relates to the technical field of high-temperature alloy casting, and particularly relates to a mold shell and a method for evaluating the castability of high-temperature alloy. The mold shell for evaluating the castability of high-temperature alloy comprises a runner system and a hot cracking tendency test unit and a filling capacity test unit connected to the runner system respectively; the runner system comprises a sprue, a straight runner, a cross runner, a first pouring plate and a second pouring plate; the hot cracking tendency test unit and the filling capacity test unit each comprise a bottom surface and four side vertical surfaces, and the four side vertical surfaces form a box-like structure without a cover around the bottom surface; and the side vertical surfaces of the hot cracking tendency test unit are provided with feature notches of various shapes. The mold shell for evaluating the castability of high-temperature alloy can ensure that the castability of the alloy, including the hot cracking tendency and the filling capacity, is evaluated simultaneously under the condition that the process conditions are completely consistent.

The invention belongs to the technical field of metallurgy, and particularly relates to a cleanliness control method for medium-carbon aluminum-containing and sulfur-containing structural steel for an automobile transmission shaft. According to the medium-carbon aluminum-containing sulfur-containing structural steel, the technological process of converter-LF refining furnace-RH vacuum treatment furnace-continuous casting is adopted, the alkalinity of refining slag is controlled by determining the type of deoxidation materials in the converter tapping and LF process, the binary alkalinity of refining final slag is controlled to be 3.5-4.0, and the slag deoxidation and inclusion adsorption capacity is enhanced; in the LF process, through a calcium treatment process, aluminum oxide and other impurities difficult to float upwards are subjected to denaturation treatment, and the situation that a large number of calcium sulfide impurities more difficult to remove are generated due to improper calcium treatment is avoided; in the continuous casting process, nozzle nodulation is controlled through nozzle argon blowing, slow pulling speed and other operations. And finally, the castability of the molten steel is improved, meanwhile, non-metallic inclusions of rolled metal are effectively controlled, the flaw detection qualification rate is increased, and meanwhile the product crack occurrence rate of a user is effectively reduced.

The invention discloses a smelting method of weathering resistant steel SPA-H molten steel, and mainly solves the technical problems that the existing weathering resistant steel SPA-H molten steel is poor in castability, inclusions are difficult to control during smelting by using an argon blowing straight-up process, and the production cost is high. According to the technical scheme, the smelting method of the weathering resistant steel SPA-H molten steel comprises the following steps: (1) desulfurizing molten iron; (2) smelting by adopting a top-bottom combined blowing converter, and adding an alloy required by alloying of a copper element into the converter along with the scrap steel; 3) converter smelting process control; 4) converter smelting end point control; 5) converter tapping control; (6) refining in a molten steel argon blowing station to adjust the temperature of the molten steel to 1580-1595 DEG C; aluminum wires are fed into the molten steel; weak stirring is conducted on the molten steel fed with the aluminum wire, and the molten steel is slightly stirred for 5-6 minutes; and then adding a titanium-iron alloy, and continuing to slightly stir the molten steel for 2-3 minutes to obtain finished molten steel. The molten steel produced by the method is directly conveyed to a continuous casting machine for casting, and the number of continuous casting furnaces is larger than or equal to 12.

The invention belongs to the technical field of steelmaking auxiliary materials, and particularly relates to an S32205 duplex stainless steel functional protection material. The functional protection material comprises the following chemical components in percentage by weight: 29-38% of SiO2, 30-34.50% of CaO, 8-12% of Al2O3, 6.5-9.5% of Na2O, 3-6% of F <->, less than or equal to 1.5% of Fe2O3, 1-3.5% of MgO, less than or equal to 1.5% of MnO, 1-3.5% of free carbon and the balance of trace elements. According to the functional protection material, the process problem caused by poor continuous casting castability of the S32205 duplex stainless steel molten steel can be solved, smooth continuous casting production is guaranteed, meanwhile, the surface and subcutaneous quality of a continuous casting blank is improved, cracks are reduced, and therefore the high rolled material yield is obtained.

The invention relates to a refrigerant runner plate, a cooling device and a manufacturing method of the cooling device. The refrigerant runner plate is made of an aluminum alloy with brand new design, and the aluminum alloy comprises the following chemical components in percentage by weight: 1.6-2.5% of Ni, 0.3-1.5% of Mn, 0.3-1.0% of Zn, 0.3-1.0% of Fe, and the balance of Al, less than or equal to 0.5% of trace elements in percentage by weight and inevitable impurities. The aluminum alloy prepared according to the component proportion has good castability, machinability and weldability. Meanwhile, the aluminum alloy prepared according to the component proportion also has good mechanical properties, especially mechanical properties in an annealing state, so that the aluminum alloy can be suitable for a refrigerant environment with relatively high working pressure after being subjected to vacuum brazing with a corresponding cover plate.

The invention relates to the technical field of alloy material casting, and discloses a heat-treatment-free die-casting alloy material and a preparation method and application thereof, and the heat-treatment-free die-casting alloy material comprises various rare earth elements and aluminum. According to the alloy material, the eutectic reaction of Si, Mg and Al is utilized, so that the alloy has good fluidity and casting formability in the solidification process, by means of the action of high-melting-point transition metal elements Mn, Cr, V, Mo and Zr, grains are refined, the thermal stability of the alloy is improved, the material has good room-temperature performance, meanwhile, the material can serve for a long time at a certain temperature, and the service life of the material is prolonged. The modification and refinement effects of rare earth elements, Ga, In and Al-Ti-B on crystal grains and eutectic structures are comprehensively utilized, the microstructure of the alloy is improved, the material has high strength and plasticity in the die-casting state, subsequent heat treatment is not needed, the procedures of deformation, correction and the like are reduced, the rejection rate is reduced, and the production period is shortened.

The invention discloses a rhenium-free nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of high-temperature alloys. According to the high-temperature alloy provided by the invention, by finely regulating and controlling the proportion of strengthening elements such as Al, Ti, Ta and W and synergistically exerting the auxiliary effects of elements such as Cr, Co, C and Hf, after an expensive rhenium (Re) element and a molybdenum (Mo) element which is easy to promote generation of a harmful phase are thoroughly abandoned, collaborative optimization of high strength, high structure stability, excellent oxidation resistance and good casting performance is successfully realized. The rhenium-free nickel-based single crystal superalloy provided by the invention has high performance, high stability, excellent oxidation resistance and hot corrosion resistance and good castability, and provides an ideal material solution for low-cost and high-reliability manufacturing of high-temperature parts of heavy duty gas turbines.

The utility model relates to a double-row air duct composite brake disc which comprises a first ribbed half disc, an aluminum core ring and a second ribbed half disc, and the first ribbed half disc and the second ribbed half disc each comprise an iron ring, an aluminum ring and a plurality of aluminum ribs. One side of the iron ring is provided with an iron nail, and the aluminum ring and the aluminum rib are provided with holes at the same position. By adopting a cast iron-aluminum alloy composite structure, the overall weight is reduced by utilizing the advantage of light weight of an aluminum material while the cast iron characteristic of a friction surface is maintained. The innovative double-row air duct design breaks through the limitation of a traditional single-row air duct, and the heat dissipation efficiency is remarkably improved by increasing the cooling airflow channel density and optimizing the convection path. The structure integrates casting process feasibility and cooling performance improvement, and the technical problems that light weight of a traditional cast iron brake disc is blocked and heat dissipation efficiency is limited are solved.

The present application relates to a kind of low-silicon high-aluminum welding wire steel and its production method, its production method is according to the flow production of converter smelting, LF refining, VD vacuum treatment and continuous casting;When converter smelting, control C, Si component when tapping, add aluminum cake, lime and calcium aluminate slagging material;When LF refining, adopt aluminum bean and calcium carbide mixed deoxidation, adopt low-carbon ferromanganese and ferromolybdenum to carry out alloy component adjustment, feed aluminum wire before refining and carry out high-aluminum content pre-adjustment, after detecting that the aluminum content is ≥0.050% 10~20min, feed pure calcium line and carry out first calcium treatment;When VD vacuum treatment, feed aluminum wire after breaking empty to the Al component control target of welding wire steel, feed pure calcium line before outlet and carry out second calcium treatment;Can effectively control low-carbon, low-silicon, high Al, low nitrogen, low Ca steel grade component, balance Ca content and molten steel castability control, realize the efficient, high-quality, low-cost continuous stable production of welding wire steel used in low temperature weak corrosion environment.

In a valve body manufactured by casting, the solidification process from a gate for casting to a neck portion is appropriately controlled to suppress the occurrence of shrinkage, thereby providing a valve body excellent in castability. A valve body (1) and a method of manufacturing the same are characterized in that a weir portion (6) as a gate at the time of casting is formed in a raised state on a cylindrical surface (2) of the body, and a wall thickness of a first region (7) from the weir portion (6) to a neck portion (3) is formed thicker than a wall thickness of other regions of the body, and the wall thickness of the first region (7) in the thicker state is formed to gradually become thinner from the weir portion (6) toward a root portion (8) of the neck portion.

The invention relates to the technical field of metal materials, in particular to a high-strength aluminum alloy and a casting method and a heat treatment method thereof. The high-strength aluminum alloy comprises the following components in percentage by mass: 4.8%-5.2% of Cu, 0.6%-1.0% of Mn, 0.15%-0.18% of Ni, 0.25%-0.45% of Mg, 0.25%-0.35% of Ti, less than or equal to 0.15% of Fe, less than or equal to 0.15% of Si, less than or equal to 0.2% of Zn and the balance of aluminum and impurities, and the impurities are less than or equal to 0.1. According to the method, on the basis of high-strength aluminum alloy of an A206 alloy aluminum-copper-manganese-magnesium system, the content of elements such as Cu, Mg, Ni and Mn is accurately controlled, and an optimized solid solution-aging process is combined, so that a theta phase (an equilibrium phase and inhibited), an S phase (a main strengthening phase), a T phase (a high-temperature strengthening phase) and a sigma phase (a structure stable phase) form an ordered multi-phase system. All phases compete for solutes and have complementary functions, and high strength, excellent castability and wide temperature range stability which are difficult to consider by a traditional aluminum alloy are finally realized through a synergistic mechanism of'intragranular dispersion strengthening and grain boundary stability strengthening '.

The invention relates to a method for increasing the number of continuous casting furnaces of medium-carbon bearing steel, in order to refine grains, the mass percentage of Al in the medium-carbon bearing steel is generally required to be 0.020-0.050%, and calcium treatment is not allowed. As secondary oxidation of a casting furnace is serious, inclusions at a tundish nozzle bowl part and a stopper rod head are easy to gather, the stopper rod rises, and the continuous casting castability is influenced. According to the technical scheme, when the medium-carbon bearing steel is poured, calcium-treatable medium-carbon steel is adopted for casting a first furnace, the first furnace is subjected to Ca treatment, the second furnace is not subjected to calcium treatment, the medium-carbon bearing steel is produced after a third furnace, and the steel must contain common components of C, Si, Mn, P, S and Cr elements with the medium-carbon bearing steel. The production efficiency is improved; the production cost is reduced.

The invention discloses alloy powder slurry, an LTCC alloy diaphragm and a power supply module, and relates to the technical field of integrated power supplies. The iron-silicon-chromium alloy is used as the substrate of the LTCC integrated power supply module, so that the current output capability, the power density, the operation stability and the reliability of the power supply module can be improved; the invention provides a systematic scheme from slurry to substrate sintering for preparing the LTCC power module substrate by replacing ferrite with the iron-silicon-chromium alloy, and the prepared alloy powder slurry is good in tape casting formability and can be used for continuously preparing high-quality LTCC alloy diaphragms; according to the preparation method, the process temperature curve of glue discharging and sintering is finely designed, so that the prepared alloy substrate is good in compactness, high in mechanical strength and stable in electromagnetic performance; the technical scheme of the invention is of great significance to the development of the next generation of power supply modules with higher efficiency, higher power density and higher switching frequency.

This application relates to a method for improving the castability of ordinary carbon steel Q235B, comprising: mixing scrap steel with molten iron and performing oxygen blowing smelting to obtain a first molten steel; performing a first deoxidation on the first molten steel to obtain a first deoxidized molten steel; performing preliminary alloying on the first deoxidized molten steel to obtain a second molten steel; adjusting the temperature of the second molten steel to a set temperature; performing a second deoxidation on the second molten steel at the set temperature to obtain a second deoxidized molten steel; performing final alloying on the second deoxidized molten steel to obtain a third molten steel; and purifying and stirring the third molten steel to obtain pure molten steel. By synergistically controlling the amount of ferrosilicon added during steelmaking and refining, and utilizing the difference in residual calcium absorption rate, calcium enrichment is achieved while precisely controlling silicon content. This method can stabilize the calcium content in molten steel without adding calcium-based alloys, promote the transformation of inclusions into liquid inclusions, thereby improving the purity of molten steel and continuous casting castability, ultimately ensuring long-term stable casting by the casting machine.

This invention provides a high-strength aluminum alloy for motor rotors, its high-pressure die-casting method, and its application, relating to the field of materials technology for motor rotors in new energy vehicles. The high-strength aluminum alloy for motor rotors of this invention comprises Si 0.28-0.32%, Mg 0.68-0.74%, Fe 0.3-0.35%, Ti≤0.05%, Ga≤0.03%, Zn≤0.03%, Cu≤0.03%, Mn≤0.01%, unavoidable impurities ≤0.01%, and the balance being Al. By introducing Mg, Si, and Fe into the aluminum alloy and adjusting the proportions of each element, it achieves good fluidity and castability. Defects such as porosity and cracks do not occur during high-pressure die-casting. The resulting rotor also possesses excellent toughness, ductility, and mechanical properties, overcoming the shortcomings of existing technologies and suitable for industrial application.

The invention relates to the technical field of casting lightweight design and manufacturing, in particular to a force visualization driven structure-process linkage casting intelligent lightweight design method which comprises the following steps: establishing a material-component-cooling rate-defect-force database of a tensile sample micro-area gauge length section and a casting mechanical property visualization model; the method comprises the following steps: optimizing an initial casting pouring system, obtaining initial casting components, cooling speed and defect simulation results, coupling a model to realize casting global rigidity differentiation visualization, importing differentiation rigidity into lightweight design software, dividing margin areas, implementing partition lightweight design, carrying out forming simulation and castability judgment, and comparing preset requirements. And finally, a casting lightweight structure which gives consideration to extreme weight reduction, global strength and casting manufacturability is obtained. According to the method, global force mapping is established between casting software and lightweight design software, closed-loop iterative optimization of the performance, the process and the structure of the casting is achieved, the lightweight level of the casting is remarkably improved, and the method has wide engineering application prospects.

The invention discloses a process method for improving castability of rare earth wear-resistant steel. The steel comprises the following chemical components in percentage by weight: 0.27%-0.29% of C, less than or equal to 0.20%-0.30% of Si, 1.00%-1.10% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.020%-0.050% of Al, 0.55%-0.65% of Cr, 0.025%-0.030% of Nb, 0.008%-0.025% of Ti, 0.16%-0.20% of Mo, 0.0010%-0.0020% of B and 0.0030%-0.0080% of Ce, the smelting process is KR + BOF + LF + RH + CC, and the key process steps comprise BOF, LF, RH and CC. By the adoption of the method, stopper control is stable in the rare earth wear-resistant steel pouring process, a water gap is not blocked by inclusions, and the castability of molten steel is improved.

The invention discloses a method for improving the castability of molten steel of low-carbon low-silicon series steel, and belongs to the field of steelmaking. During converter tapping, refined lime and a top slag modifier are added in a graded mode according to the end-point oxygen content, so that the oxidability of CAS top slag is reduced, and Al2O3 inclusions generated by secondary oxidation are reduced; large argon blowing is carried out in a CAS station, the soft argon blowing time is prolonged, and the upward floating removal rate of Al2O3 inclusions is increased; the adding proportion and quantity of temperature-adjusting waste steel in the CAS station are strictly controlled, the aluminum wire feeding proportion and quantity are reduced, molten steel deoxidation is moved to the converter tapping stage forwards, and secondary oxidation in the CAS station is reduced; the production rhythm is optimized, it is ensured that the molten steel standing time of a continuous casting platform is appropriate, and inclusions are promoted to be fully floated and removed; according to the method, generation and accumulation of Al2O3 inclusions are remarkably reduced, the removal rate of the inclusions is increased, the pouring effect is protected, the service life of a tundish is prolonged, the blocking level and replacement frequency of a water gap are reduced, and the continuous casting constant-speed pouring rate and production stability are improved.

The application provides a control method for improving the castability of a beam blank silicon killed steel, and the application establishes an intelligent argon blowing model at the end of a converter, combines dynamic deoxidation alloying, and matches top lime and fluorite to quickly form top slag with a certain basicity. The intelligent argon blowing system is used at the refining inlet to quickly form slag, the LIBS steel slag online detection system is used to quickly analyze the slag composition, a slag control model is established, and guidance is provided for the next step of slag adjustment. The calcium treatment in refining adopts hierarchical control, different package conditions and process control conditions are treated in stages, the recommended feeding amount of nano high-calcium wire is obtained through total oxygen calculation, a new type of seamless nano high-calcium wire is used to ensure the calcium yield, and after calcium treatment, the intelligent argon blowing system is switched to soft blowing mode to ensure the sufficient floating of inclusions. Different water inlets and slide block combinations are matched according to different billet types during continuous casting to ensure the stability of the casting process.

The alkalinity of the casting powder ranges from 0.8 to 1.0, the melting point of the casting powder ranges from 1000 DEG C to 1100 DEG C, the viscosity of the casting powder ranges from 0.25 Pa.s to 0.45 Pa.s at the temperature of 1300 DEG C, and the casting powder comprises the chemical components of CaO, SiO2, Al2O3, MgO, Na2O, F <->, B2O3 and C. When the casting powder is applied to continuous casting production of low-carbon steel, the casting property of high-hydrogen low-carbon steel can be improved, slag entrapment of a crystallizer flow field is reduced, the problem of adhesion alarm of steel billets in the continuous casting process is solved, and good inclusion absorption capacity is kept, so that the casting blank quality problem of the high-hydrogen low-carbon steel is comprehensively solved.

The application provides a high-casting-performance beryllium aluminum alloy and a preparation method thereof, and belongs to the technical field of alloy materials.The preparation method comprises the following steps: preparing materials according to the weight percentages of Be ingots, Al ingots, Ag ingots, Co sheets, Si and La metals; placing the Ag ingots, the Co sheets, the Si and the La metals at the bottom of a crucible, then sequentially placing the Al ingots and the beryllium ingots into the crucible, refining, and obtaining a melt; uniformly stirring the melt, then gradually cooling the melt to a pouring temperature, then pouring the melt into a prefabricated ceramic mold shell, and standing for 3-5 minutes in a furnace and cooling outside the furnace.The beryllium aluminum alloy has a uniform and dense structure, good fluidity, high casting performance, and is easy to be cast into a shape, and has fewer casting defects.

Disclosed in the present invention is an electric furnace continuous casting production method for an annealed steel material for deep drawing, comprising the process steps of electric furnace smelting, LF refining, VD refining, square billet continuous casting, heating, rolling, slow cooling, and annealing. During electric furnace smelting, scrap steel and molten iron are used as raw materials, wherein the proportion of the molten iron is 60%-80%. During LF refining, the slag basicity is controlled to be 5.5-7. During VD refining, static argon blowing is performed after vacuum breaking, wherein the soft blowing time is controlled to be 8-14 min, and the argon pressure is controlled to be 0.1-0.3 MPa. During rolling, the initial rolling temperature ranges from 1100°C to 1200°C, and the finish rolling temperature ranges from 850°C to 1000°C. An annealing process curve satisfies the formula t2-t1=2-4 h. By means of the method, the castability in the steel continuous casting production can be improved, the number of continuous casting heats can reach six, the steel exhibits a low inclusion level, and after quenching and tempering, the impact toughness is greater than or equal to 200 J, the tensile strength is greater than or equal to 400 MPa, and the percent elongation is greater than or equal to 30%.

The invention relates to a Ni-Cr-Co-Mo based heat-resistant alloy and a preparation method thereof, and relates to the technical field of heat-resistant alloys. According to the main technical scheme, the Ni-Cr-Co-Mo based heat-resisting alloy is prepared from the following chemical components in percentage by weight: 0.01 to 0.07 weight percent of C, 0.001 to 0.007 weight percent of B, 20 to 24 weight percent of Cr, 8 to 11 weight percent of Co, 7 to 10 weight percent of Mo, 0.5 to 1.8 weight percent of Al, 0.5 to 1.6 weight percent of Ti, 0.1 to 1.0 weight percent of Nb and the balance of Ni and inevitable impurities. Wherein in the Ni-Cr-Co-Mo based heat-resistant alloy, the ratio of the weight percent of the Ti element to the weight percent of the Al element is larger than 0.81 and smaller than 1.8; the sum of the weight percentages of Nb, Ti and Al is greater than 2.1 wt% and less than 2.8 wt%; the sum of the weight percentages of Cr, Co and Mo is greater than 38.5 wt% and less than 42.0 wt%. The Ni-Cr-Co-Mo-based heat-resistant alloy has excellent strength, plasticity, castability and weldability within the temperature range of 650-750 DEG C, and is used for manufacturing coal-fired power plant steam turbine casting parts with the steam temperature of 650-750 DEG C.

The invention discloses a sand mold composite material for ink-jet 3D printing and a preparation method and use method thereof.The sand mold composite material comprises a powder material and ink, and the powder material is composed of inorganic raw materials such as magnesium phosphate cement, a castability regulating agent and a setting time quick change agent; toxic gases such as volatile organic compounds are not released in the preparation, printing and casting processes, no pungent smell exists, and the adhesive is superior to an organic resin adhesive in the aspect of environmental protection. On the premise of ensuring good powder laying performance, the castability regulating agent avoids dense accumulation, reserves more communicating pores, facilitates smooth exhaust of gas, and meets the requirement for air permeability of the sand mold. The setting time quick change agent is added into the magnesium phosphate component, so that the hydration setting rate is increased, the setting time can be controlled within 20-30 s, the ink diffusion phenomenon is improved, the forming precision of the material is further improved, and the printing precision requirement is met. In addition, during printing, the weight ratio of the ink to the powder material in unit volume is 0.2-0.4, and the air permeability of the sand mold is improved.