2results about How to "High low temperature strength" patented technology

The invention relates to a carbonaceous reducing agent pellet with low-order non-caking coal as a main body and application, and belongs to the technical field of efficient and clean utilization of resources. The carbonaceous reducing agent pellets are mainly prepared from low-order non-caking coal as a main body, the main body is matched with a composite organic binder, silica fume and a reinforcing agent, the mixture is subjected to compression molding and then placed in a sintering furnace to be roasted at the temperature of 450-650 DEG C in a protective atmosphere, and furnace cooling is conducted till the carbonaceous reducing agent pellets are obtained. The pellet developed by the invention has the characteristics of high fixed carbon content, high pellet strength, high breakage resistance, good static spheroidization index, low content of introduced impurities and high reaction activity, so that the pellet is particularly suitable for industrial silicon smelting. The low-order non-caking coal is applied in a large proportion, the micro-silicon powder produced by the submerged arc furnace is recycled, and the method is clean and environment-friendly, can be completely used for smelting and production of industrial silicon, reduces smelting unit consumption and production cost, and can replace or partially replace charcoal to become a carbonaceous reducing agent for smelting of industrial silicon.

The application discloses an austenitic structure steel and a preparation process thereof, and belongs to the technical field of metal materials. The Nb and N element content in the austenitic steel should satisfy: Lg([N][Nb])<-1.5 and -1.5 The precipitate in the austenitic structure steel is mainly nitride, the size of the nitride is smaller than 200 nm, and there is no large-size primary MX phase precipitate. Through the steel composition and process control, the austenitic structure steel is more reasonable in the solid solution stage dispersion nitride precipitate size and distribution, the precipitation strengthening effect is improved, and the low-temperature strength of the austenitic structure steel is improved, meanwhile, the generation of the primary MX phase in the solidification stage is reduced, and the toughness and plasticity of the austenitic structure steel in the super-low temperature environment are ensured.