34results about How to "Guaranteed carbon content" patented technology

The invention discloses a hyper-high purity extracting technology of natural graphite, which comprises the following steps: (1) putting natural graphite in the container to do oxidizing disposal with low-middle carbon content more than 98%; (2) fusing at high temperature; (3) inputting in the metal erosion-proof container; proceeding dealkalization; (4) deacidifying to wash to neutral; (5) proceeding electromagnetic black metal removing disposal in the floating pool; (6) heating in the autoclave from 118 deg, 206 deg and 220 deg separately; (7) using pure water to dispose; (8) dehydrating; (9) drying until the water content is less than 0.1%.

The invention discloses a preparation method of molybdenum alloys for an isothermal forging die. The method includes the steps that first, molybdenum powder, additive powder, auxiliary additive powder and carbon powder are placed in a blender mixer to be evenly mixed so that alloy powder can be obtained, wherein the additive powder is titanium carbide and / or zirconium carbide; second, the alloy powder is pressed into pressed compact; third, the pressed compact is placed into a sintering furnace to be sintered, and after the pressed compact is cooled along with the furnace, molybdenum alloy blank is obtained; fourth, multi-pass drawing is conducted on the molybdenum alloy blank, and then multi-pass upsetting is carried out on the drawn molybdenum alloy blank; fifth, annealing treatment is conducted on the upset molybdenum alloy blank, and the molybdenum alloys for the isothermal forging die can be obtained after the molybdenum alloy blank is cooled along with the furnace; or the step four is repeated for one to two times for the upset molybdenum alloy blank, then the annealing treatment is conducted, and the molybdenum alloys for the isothermal forging die can be obtained after the molybdenum alloy blank is cooled along with the furnace. By means of the method, the prepared molybdenum alloys are even in structure and good in performance, and the molybdenum alloys are obviously superior to molybdenum alloys of the same kind prepared through an existing conventional method.

The invention discloses a smelting method for stably controlling the carbon content of low-carbon steel. The smelting methods are converter smelting, LF refining and continuous casting. In the present invention, by rationally optimizing process parameters and strengthening process capability control, the carbon content can be stably controlled within 0.05% without RH vacuum treatment, and the carbon fluctuation range of the finished product is small, controlled at 0.03-0.05%, and the target value hits The high rate is conducive to the stability of product quality and reduces the change of judgment or scrapping caused by out-of-standard ingredients. The invention does not require the RH decarburization process, and through the adjustment and mutual coordination of the conditions of each step, the carbon content of the low-carbon steel is stably controlled at 0.03-0.05%, and the inclusion content is low, which is comparable to the common smelting process converter-RH decarburization-LF treatment- Compared with continuous casting, the operation is simple, the production efficiency is high, and the cost per ton of steel is effectively reduced.

The invention relates to a manufacturing process of steel of a chain, in particular to a manufacturing process of round pipe steel of a chain, belonging to the processing industry of steels. The manufacturing process of the round pipe steel of the chain comprises orderly processing a belt material by the following steps in sequence: de-rusting, rolling, annealing, acid cleaning, phosphating, washing with clear water, saponifying, flattening and coiling to form round pipe, wherein the rolling is four continuous rolling or five continuous rolling; the annealing is divided into three steps: the first step is heating insulating treatment, wherein the rolled belt material is fed into an annealing furnace to be heated, nitrogen is fed in the annealing furnace when the annealing furnace is heated to 450-500 DEG C, the temperature is kept for 5-7 hours after the heating temperature reaches 670-700 DEG C; the second step is furnace cooling, and the belt material treated by the heating insulating treatment is cooled to be 300-400 DEG C in the annealing furnace. The manufacturing process of the round pipe steel of the chain is simple in process and low in cost; the manufactured steel plate for the round pipe of the chain is high in strength, corrosion resistant and high in precision.

The invention discloses a continuous carbonization furnace and a method for continuously producing coarse-grained carbide powder. The furnace is a tunnel type and boat propulsion type furnace, and consists of a furnace end, a low-temperature deoxidizing area, a high-temperature carbonizing area and a furnace tail in sequence, wherein a furnace tube of the low-temperature deoxidizing area is made of heat-resistant steel or ceramic, and is heated by using an electric heating element; a heat-preserving material is an organic non-metallic refractory material; the temperature is controlled separately, and is lower than the working temperature of the high-temperature carbonizing area; a reducing gas H2 serving as a working medium is introduced; a non-oxidizing gas serving as a protective gas is input into the furnace tube of the high-temperature carbonizing area; and the protective gas flows through the furnace tail, the high-temperature carbonizing area, the low-temperature deoxidizing area and the furnace end in sequence. A production method comprises the following steps of: burdening and mixing; loading into a boat, and conveying the boat; deoxidizing at a low temperature; carbonizing at a high temperature; and discharging to obtain the coarse-grained carbide powder. The carbon content of the produced carbide powder can be consistent with a certain requirement, and shortening of the service lives of furnace tubes, heating bodies, heat-preserving bodies and the like in the furnace caused by the losses of carbon / graphite materials can be prevented.

The invention discloses a composite shaped coal binder, which belongs to the field of shaped coal. The present invention uses lithium-based grease, sodium-based bentonite, sodium aluminosilicate, etc. as raw materials to prepare briquette binder A, wherein lithium-based grease has good anti-fretting wear performance, and the added hydrogen-containing silicone oil may also provide hydrophobic At the same time, it can help improve the bonding stability of the blend, improve the binding effect on coal powder particles, and stably improve the thermal efficiency and molding effect of briquettes; fish skin, rice straw, Lactobacillus bulgaricus, etc. Co-fermentation uses microbial metabolism to destroy fish skin and straw tissue to obtain colloids and sugars, while ensuring cohesiveness and increasing carbon content. The invention solves the problems of high ash content, low carbon content and poor structural stability in the briquette prepared by the conventional briquette binder.

The invention relates to a preparation method of HRB500E niobium-titanium alloy threaded steel, and relates to the technical field of alloy steel. Add scrap steel, niobium-titanium alloy and quicklime; step c, carry out first converter smelting and generate molten steel; step d, first detect the molten steel generated by first smelting; step e, add molten iron to the converter, and carry out second smelting, The molten steel that has been smelted for the second time is detected for the second time; in step f, the central control module controls the molten iron pouring device to add molten iron to the converter, and the third smelting is performed. Carry out the third detection; step g, sequentially perform argon blowing, continuous casting, rolling and heat treatment on the molten steel whose carbon content meets the requirements after the third detection. The method of the invention effectively improves the quality of the rebar produced.

The invention discloses a preparation method of a TZM alloy material, which comprises following steps: 1. putting molybdenum powder, additive powder, auxiliary additive powder and carbon powder in a blender mixer for uniform mixing to obtain alloy powder; 2. fabricating the alloy powder into a compact; 3. putting the compact into a sintering furnace, heating the sintering furnace under a vacuum condition, conducting heat preservation for 3-5 h when the temperature in the furnace is heated to 1,500 DEG C to 1,850 DEG C, inletting hydrogen into the sintering furnace, increasing the temperature continuously to 1,950 DEG C to 2,200 DEG C, conducting insulated sintering for 5-10 h and then obtaining the TZM alloy material through furnace cooling. In the invention, a carbide strengthening phase is directly added in the alloy powder to decrease losses of carbon elements in the alloy sintering. Meanwhile, the invention adopt a method of combining the vacuum sintering with the hydrogen sintering to control the change tendency of alloy elements during the alloy sintering, further realizing the reduction of oxygen content which can be controlled under 250 ppm.

The invention relates to a low-carbon aluminum-magnesium spinel carbon brick with high thermal shock resistance and a preparation method thereof; comprising 1-90 parts of corundum spinel carbon regenerated material, 1-50 parts of corundum particles, and 1-50 parts of fused magnesia 40 parts, 1-40 parts of corundum dust removal powder, 1-8 parts of activated α-alumina fine powder, 1-10 parts of spinel-calcium aluminate composite material, 0.1-3 parts of metal aluminum powder, and 0.1-3 parts of nano-carbon black 5 parts, 1-8 parts of bonding agent; The object of the present invention is to provide a kind of novel high thermal shock resistance low-carbon aluminum-magnesium spinel carbon brick, through the high thermal shock resistance low-carbon aluminum-magnesium spinel carbon brick It is designed to solve the problems existing in the prior art, such as tabular alumina, white corundum, fused magnesia, flake graphite, spinel micropowder, alumina micropowder, silicon carbide fine powder, etc. Obtain, cause great pollution to the environment, and the technical problem that raw material cost is high.

The invention discloses a process for one-step reduction of metallurgical composite slag to obtain molten iron and a matte phase, belongs to the technical fields of ferrous metallurgy and non-ferrous metallurgy, and relates to a technology for separating and recovering iron and nonferrous metals of metallurgical composite slag in a reducing melting process. The process comprises the following steps: levigating metallurgical composite slag and then feeding lime and a carbonaceous reducing agent to prepare a carbon-containing pellet; directly restoring the carbon-containing pellet and then achieving slag-matte-iron three-phase layering in a melting furnace; and respectively recovering iron and nonferrous metals. The process is capable of achieving separation of iron and nonferrous metals, and gathering the nonferrous metals into the matte phase to play a comprehensive recovery role in a plurality of metal elements; a serious environment problem is caused by stacking of the metallurgical slag, and great waste of resources is also caused, so that the current situation of utilization of the metallurgical slag is greatly changed by the process; considerable economic benefits and social benefits are generated; and the process has a wide application prospect.

The application discloses a powder metallurgy moving ring. The powder metallurgy material composition of the powder metallurgy moving ring is 0.4-0.6% of cobalt powder, 7.3%-8.5% of nickel powder, and the balance is tungsten carbide powder. The powder metallurgy moving ring provided by the application has good hot red hardness, no obvious change in performance under high temperature conditions, and good wear resistance. This application also discloses a method for preparing powder metallurgy moving rings, including mixing materials, ball milling, drying, adding molding agents, compression molding, sintering and other processes. By increasing the amount of molding agents in the mixed materials after ball milling, the A good molding effect is achieved, and the molding performance is improved, and the molding agent is removed by adopting multi-stage temperature control in the subsequent vacuum sintering process, which not only ensures the molding performance, but also removes the molding agent to avoid It affects the product properties after sintering.