Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

1260results about How to "Reduce carbon content" patented technology

Method for smelting ultra-low carbon steel

The invention provides a method for melting ultra-low carbon steel. The method adopts a desulfuration of molten iron-converter-RH-continuous casting process, wherein a sulfur content in the molten iron is 0.002%-0.006% after desulphurization; converter smelting controls oxygen blowing time, an oxygen gun flow, a bottom-blowing intensity and a smelting period, adopts slag-stopping tapping, steel tapping with a content of C being 0.06%-0.08% and with a temperature of 1650-1680 DEG C, and an oxygen content in the molten iron is 0.03%-0.05%; an RH adopts forced decarburization with a highest vacuum degree of 67-100 MPa and decarburization time of 15-27 min, and a carbon content in the molten iron is 0.0010%-0.0020% and a dissolved oxygen content in the molten iron is 0.025%-0.040% after the decarburization; the molten iron is recycled for 3-5 min after deoxidation by adding aluminium and recycled for another 3-5 min after adding other alloys; a nitrogen content in the molten iron is 0.0015%-0.0035%, and the temperature is 1590-1640 DEG C; and killed steel treatment is carried out for 10-30 min. The method adopts converter tapping with a high carbon and low oxygen content, can use less or not use slag modified agents during the tapping process, accelerates the production rhythm, makes the molten steel cleaner, and reduces the production cost.
Owner:ANGANG STEEL CO LTD

Integral process for oil shale retorting oil refining and coal-char combustion power generation

The present invention discloses an oil shale carbonization oil refining, carbocoal burning electricity generating integrated technology. The present invention is characterized in that green ore oil shale is crushed into 0 to 15mm grains by a crusher, through that circulating fluid bed boiler circulating ash is used as a solid heat carrier, the mixture of the oil shale and the circulating ash is fed into a roller retort to form oil shale oil refining, carbocoal and the oil shale are mixed, fluidized and burned to generate electricity as a whole, separated non-condensation carbonization coal gas is fed into the circulating fluid bed boiler and the both are burned with the carbocoal and the oil shale together or is fed into a gas engine for direct-fired power generation; the carbon content of the clinker after burned on the circulating fluid bed is less than 2 percent, thus no further roasting is necessary, and the present invention can be directly used as building raw material; the thermal value of produced carbonization coal gas which can be directly used as fuel to feed into the boiler for burning is high, the quantity of heat released through burning can be transferred to the water through the heated surface of the boiler, the water is heated into a overheat steam to be used as out-supplied working substance and/or to be fed into a steam turbine for power and electricity generating. The present invention has the advantages that the comprehensive utilization degree is high, the cost is low, the technology is scientific and reasonable, etc.
Owner:NORTHEAST DIANLI UNIVERSITY +1

Process and device for continuous steelmaking from ferriferous material

The invention relates to a process for continuous steelmaking from a ferriferous material. A molten pool is formed in a steel-smelting furnace at first, and carbonic material and oxygen are insufflated to form foaming slag; the ferriferous material and a fluxing agent are added into the smelting furnace to be molten and reduced, oxygen is insufflated into the molten steel so as to reduce the carbon content in the molten steel, the temperature of the molten steel is risen, and the molten steel is stirred with the generated CO gas; high temperature oxygen or oxygen-enriched air is insufflated and burns with CO gas generated in the smelting furnace; and the molten steel continuously flows into an oxygen blowing furnace through a siphon nozzle, and a small quantity of the fluxing agent is added into the oxygen blowing furnace so that slag formation, desulfurization and dephosphorization are performed, the C content and the temperature in the molten steel are further adjusted through blowing oxygen by an insertion oxygen lance, therefore, the obtained molten steel is directly supplied for an LF refining furnace or an RH refining furnace. The invention has the advantages that the productivity equipment including a suspended pre-reduction furnace, the smelting furnace and the oxygen blowing furnace, the investment for devices and capital construction is saved, the land is saved, the physical distribution is simplified, and the continuous production and the automatic control are facilitated.
Owner:LAIWU IRON & STEEL GRP

Petroleum casing pipe with high strength and high toughness and preparing method thereof

The present invention provides a petroleum casing pipe with high strength and high toughness, wherein the weight of the component element of the casing pipe steel is characterized proportionally. The invention also provides a preparing method for preparing the petroleum casing pipe with high strength and high toughness, wherein the method comprises the following steps: 1. smelting the ingredients and casting the tube blank; 2. punching and tandem rolling of the steel tube; and 3. heat treating. The invention has the following beneficial effects: the performance of the petroleum casing pipe obtained by the method is the performance of the steel with lower content of alloy and the cost is low; a low carbon content is adopted so that the lath martensite tissue is obtained after heat treatment, the high toughness is provided after tempering and a delayed fracture resistance is provided; the complex micro-alloying processing techniques of V, Nb, Ti, B, etc. are adopted for strengthening the matrix, strengthening the grain-boundary strength, increasing the tempering resistance, reducing the content of manganese element, reducing the content of the impurity elements and improving the shape of the inclusion. The rolling ratio is optimized so that the aeolotropism of the material is remarkably reduced and the horizontal and vertical impact toughness of the material is larger than 0.8. The casing pipe of the invention far exceeds the prior highest steel grade requirement of the API standard.
Owner:TIANJIN PIPE GROUP CORP

High-performance hot-working die steel for large die-casting die and manufacturing technology of high-performance hot-working die steel

InactiveCN107557667AReduce carbon contentIncrease Mo contentManufacturing technologyHeat treated
The invention relates to high-performance hot-working die steel for a large die-casting die and a manufacturing technology of the high-performance hot-working die steel. The high-performance hot-working die steel is prepared from, by mass, 0.20%-0.30% of C, smaller than or equal to 0.40% of Si, 0.30%-0.60% of Mn, 4.10%-4.50% of Cr, 2.10%-2.30% of Mo, 0.10%-0.20% of W, 0.40%-0.80% of V, smaller than 0.01% of P, smaller than 0.005% of S, 0.02%-0.04% of Nb and the balance Fe. The manufacturing method of the die steel comprises the following manufacturing process that material mixing, smelting andcasting are conducted, and then electroslag remelting is conducted; high-temperature diffusion heat treatment is conducted, multi-directional forging hot working is conducted, and cooling controllingafter forging is conducted; secondary carbide refining heat treatment and isothermal annealing treatment are conducted; and finally quenching and tempering heat treatment is conducted. The hot-working die steel has the advantages that the hardenability, the heat stability, the impact toughness and the thermal fatigue property are superior to those of H13 steel, the hot-working die steel can be machined into a single large die-casting die with the weight reaching 5 tons or above, and the good using performance is achieved.
Owner:ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING

High-performance hot-rolled H profile steel resisting atmosphere corrosion and preparation method thereof

The invention aims to solve the defects of welding and strength performances in traditional weather-resistant H profile steel, and provides high-performance hot-rolled H profile steel resisting atmosphere corrosion and a preparation method thereof. The H profile steel comprises the following chemical components: C, Si, Mn, Cr, Cu, Ni, Mo, Sb, Als, not more than 0.025% of P, not more than 0.010% of S, not more than 0.0080% of N, Bs, Nb, Ti, V, Ca, and the balance of Fe and inevitable impurities; and the required atmosphere corrosion resisting index I is not less than 6.30. The preparation method is to perform air cooling or rapid cooling for a forging blank of the components after secondary rolling. The product reduces the carbon content, adds the microalloying elements of Nb and Ti, adds Ni, Mo, Cu and Cr, and also adds Sb to greatly improve the corrosion resistance in industrial-polluted atmosphere environment containing such higher pollutants as SO2; the steel structure of the product mainly adopts ferrite and ferrite+bainite; and the product has the yield strength of 235-500 MPa grade, is excellent in toughness and plasticity, is excellent in industrial-polluted atmosphere environment corrosion resistance, and can be used without coating in the industrial-polluted atmosphere environment.
Owner:蒋南宁
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products