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 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.