30results about How to "Good shape of graphite" patented technology

The invention relates to a manufacturing technique of an automotive vanadium titanium cast iron brake drum with high strength and high abrasive resistance, and particularly relates to a preparation method of a vanadium titanium cast iron brake drum. The preparation method comprises the following steps: melting base iron, namely b y taking vanadium titanium pig iron, steel scrap, foundry returns, a carburant, ferrosilicon, ferromanganese and ferrochrome as furnace charge, adding the carburant to the furnace bottom; smelting the furnace charges by using a medium-frequency induction furnace to prepare the base iron; heating and purifying molten iron in an overheating manner after the molten iron is molten down, and then carrying out heat preservation at 1520-1530 DEG C; and carrying out drossing, adding a slag conglomeration agent to the surface to carry out heat preservation after drossing, and then adding a little of furnace charge, and adjusting the ingredients and the like of the molten iron. A little of furnace charge is added at the later smelting stage to increase the heterogeneous core technology, so that the chilling tendency of the molten iron is relieved, the graphitization ability of the molten iron is improved, and the inoculation effect is improved. A secondary inoculation treatment process of a launder and a pouring cup is adopted, so that the inoculation effect is improved, the graphite form is improved, carbide and ferrite are removed, and the content of pearlite is improved.

The invention discloses a manufacturing technology and device for an improved forged steel roller neck high nickel chrome molybdenum alloy cast composite roller. The roller comprises, by mass percent, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, not larger than 0.05% of P, not larger than 0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE and the balance Fe and inevitable micro elements. Yttrium base rare-earth nodulizing and Ba, Ca, and silicon iron composite inoculation are adopted, Nb, Ti, V, B and Sb are added for modification, and the mechanical performance of the roller is improved; by the adoption of the forged steel roller neck, the strength of the roller is improved, an induction heater is adopted to carry out in-mold whole heating casting on a core stick, a water cooled crystallizer is molded, a composite layer interface can be dynamically controlled, the technology is simple, the efficiency is high, power consumption is small, the cost is low, no composition segregation exists, and the service life of the roller is long.

The invention discloses a manufacturing technique and device for an improved bainite nodular cast iron composite roller provided with a forged steel roller neck. The improved bainite nodular cast iron composite roller provided with the forged steel roller neck is prepared from, by mass, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% f Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, 0-0.05% of P, 0-0.30% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE, and the balance Fe and inevitable trace elements. According to the manufacturing technique and device for the improved bainite nodular cast iron composite roller provided with the forged steel roller neck, yttrium-based rare earth is used for nodularization, Ba, Ca and silicon iron are used for combined inoculation, Nb, Ti, V, B and Sb are added for modification treatment, and thus the mechanical property of the roller is improved; by the adoption of the forged steel roller neck, the strength of the roller is improved; integral in-mold heating and casting of a core rod are conducted through an induction heater, and a water-cooling crystallizer is used for formation; the interface of a composite layer can be controlled dynamically, the technique is simple, power consumption is low, the cost is low, composition segregation is avoided, and the service life of the roller is long.

The invention discloses gray cast iron and a preparation method thereof, and belongs to the field of metal casting. The gray cast iron and the preparation method solve the technical problems that existing gray cast iron is high in production cost and insufficient in performance. According to the gray cast iron and the preparation method, precious metal such as copper, molybdenum, nickel and vanadium is not added, strength and hardness of castings are improved through chromium and antimony, the manufacturing cost is reduced, and performance of the gray cast iron can be improved by conducting microalloying on antimony and chromium together.

The invention relates to a preparation method of a material suitable for a diesel engine cylinder cover. The preparation method of the material suitable for the diesel engine cylinder cover comprisesthe following steps of (1) adopting steel scraps and foundry return as furnace charges, sequentially adding into an intermediate frequency furnace, melting to obtain molten iron, and adding a petroleum coke carburant when the temperature of the molten iron reaches to 1400 DEG C; (2) when the temperature of the molten iron reaches to 1530 to 1560 DEG C, adding ferro manganese nitride, uniformly stirring, and tapping after preserving heat for 8 to 12 minutes; (3) adding an inoculator into a ladle for the first time, starting inoculation treatment for the second time when the molten iron in the ladle accounts for one third of the tapping amount, and adding a metal-stream inoculation agent for the third time in the molten iron pouring process; and (4) adopting a sand-lined metal mold casting mold for pouring to obtain a gray cast iron material suitable for the diesel engine cylinder cover. According to the preparation method of the material suitable for the diesel engine cylinder cover provided by the invention, through adding a nitrogen element, reducing the alloy element content, improving the inoculation times and combining a sand-lined metal mold process for casting, so that the mechanical property and the strength of the gray iron material are remarkably improved, and the cracking problem caused by low material strength and heat fatigue of the diesel engine cylinder cover at present are solved.

The invention provides smelting ingredients of a support, which is mainly used for solving the problem that a support cast by the traditional smelting ingredients of the support comprises the following compositions in percentage by mass: C 3.1-3.6, silicon 1.95-2.4, manganese 0.6-0.9, sulfur 0-0.12, phosphorus 0-0.1, chromium 0.4-0.5, stibium 0.010-0.055, copper 0-0.2 and the balance of ferrum. The finished support casted by the smelting ingredients of the support, provided by the invention, is not easy to crack, high in tensile strength, relatively small in brittleness, high in rigidity, good in graphite pattern, and synchronously relatively low in cost.

The invention relates to a high-copper low-nickel molybdenum alloy material, which is prepared by utilizing an intermediate-frequency electric furnace and comprises the following chemical components by weight percent (%): 2.8-3.0% of C, 1.8-2.2% of Si, 0.4-0.6% of Mn, less than 0.1% of P, less than 0.1% of S, 2.0-2.2% of Cu, 0.7% of Mo, 0.2% of Ni, and the balance of Fe. The high-copper low-nickel molybdenum alloy material is prepared according to the following steps of: quickly increasing the temperature of molten iron in the electric furnace to 1,570-1,600 DEG C; starting conventional breeding; after ending breeding, ensuring the temperature in a casting crucible within a scope of 1,440-1,460 DEG C and casting; after cooling the temperature of a casting mould to be 1,150 DEG C, performing water cooling; and not stopping cooling till the temperature of a casting blank is at 700 DEG C. The hardness of the material is 270-310HB and the strength reaches 280Mpa.

The invention discloses a method for improving the structure performance of nodular cast iron, and relates to the technical field of cast iron. The method comprises the following steps: introducing graphene composite particles into the nodular cast iron to obtain a finished nodular iron casting product; according to the introduction step, the graphene composite particles subjected to ball millingtreatment are added to molten-state nodular cast iron; the ball milling treatment is mixing and ball-milling treatment of iron powder and the graphene composite particles; and the addition quantity ofthe graphene composite particles in the finished nodular iron casting product is 0.25wt.%-0.33wt.%. The graphene composite particles prepared with the method can remarkably increase the spheroidization rate of the nodular cast iron, graphite nodules are rounded through improvement of the spheroidization rate, in the solidification process, graphite distortion mainly occurs in the growth process of spherical graphite in molten iron, and the probability of distortion can be reduced through reduction of the growth rate, therefore, through introduction of the graphene composite particles preparedwith the method, the spheroidization rate of nodular cast iron can be greatly increased, and the mechanical property of the nodular cast iron can be further improved.

The invention relates to a castable as well as a preparation method and application thereof. The castable comprises the following chemical components of, in percentage by mass, 3.0%-3.4% of C, 1.5%-1.8% of Si, 0.3%-0.6% of Mn, less than or equal to 0.04% of P, less than or equal to 0.05% of S, 0.018%-0.025% of Mg, 0.01%-0.03% of Re, 0.1%-0.2% of Ti, and the balance Fe. The invention further discloses a preparation method of a mold. A mold material is low in carbon equivalent and alloy content, the preparation method of the mold is simple, the production cost is low, and the mold has excellent crack resistance and long service life.