47results about How to "High low temperature strength" patented technology

A method for producing a sintered ore (50a) which comprises forming, on the surface of a nucleus particle (51) containing an iron ore, a first coating layer (52) using an iron-containing substance andoptionally an SiO2-containing material, and subsequently a second coating layer (53) using limestone and a solid fuel based material, to prepare a granulated particle (50), and then sintering the granulated particle (50), wherein the iron-containing substance used for forming the first coating layer (52) has a porosity of 20 % or less or has a porosity of 20 % or less and a content of Al2O3 of 2.1 mass % or less, and wherein the iron ore for the nucleus particle has a porosity higher than that of the iron-containing substance used for the first coating layer (52) or has a porosity and / or a content of Al2O3 higher than that or those of the iron-containing substance.

The invention discloses high-temperature-resisting thermal recovery cement and a preparation method thereof. The thermal recovery cement comprises the following components in parts by weight of 55-65 parts of aluminate cement grog, 10-30 parts of phosphorite dregs, 10-30 parts of slags, 1-3 parts of ceramic fibers and 1-3 parts of rubber powder. The preparation method comprises the following steps of weighing the aluminate cement grog, the phosphorite dregs and the slags, mixing so as to obtain a mixing powder body, pouring the mixing powder body into a ball mill for grinding until the specific surface area of 250-300m<2> / kg is achieved, adding the ceramic fibers and the rubber powder, and stirring for ten minutes in a mixing manner to obtain the high-temperature-resisting thermal recovery cement. The high-temperature-resisting thermal recovery cement and the preparation method thereof provided by the invention have the advantages that an engineering property of the thermal recovery cement is easy to regulate, and the intensity is high under the low temperature; for a cement stone made of the thermal recovery cement, an excellent high temperature resistance property is realized, the intensity is not decayed when the formed hardened cement is subjected to the high temperature, the permeability is not increased, the thermal recovery cement has the certain tenacity, the well-cementing requirement of a thick oil thermal production well is met, a principle of the preparation method is reliable, the operation is simple and convenient, and the production cost is low.

The present invention relates to one kind of mineral bonding material prepared with phosphoric acid and alumina and silica material at relatively low temperature and its composite material. At relatively low temperature, alumina and silica material with reaction activity and phosphoric acid produce bonding reaction to form one kind of amorphous solid mineral bonding Al-Si-P material. The mineral bonding Al-Si-P material may be used as base material and added with bauxite, silica powder, flyash, mineral slag, fiber, etc to prepare various kinds of composite material with different performances. The composite materials may be cast or pressed to form optionally without needing of introducing alkali earth ions, and the prepared material has high durability, high mechanical strength and good high temperature performance.

The invention relates to austenitic stainless steel which is high in low temperature strength, low temperature toughness and low temperature non-magnetism as well as better in neutron irradiation resistance, can be used in a magnet support structure of a nuclear fusion reactor, and comprises the components by mass percent: 16.00-22.0% of Cr, 8.00-12.00% of Ni, 1.00-3.00% of Mo, 0.06-0.25% of N, 0.010-0.040% of C, 1.00-4.00% of Mn, less than or equal to 1.00% of Si, 0.01-0.10% of Nb, 0.01-0.10% of Ta, 0.030-0.10% of Co, less than or equal to 0.03% of P, less than or equal to 0.005% of S, 0.0005-0.0018% of B, and the balance of Fe and unavoidable impurities; and furthermore, the value of Val (Cr-Ni) is less than 20.5, and Val (Cr-Ni)= 3* (Cr+Mo)+4.5*Si-2.8*Ni-1.4*Mn-84*(C+N).

The present invention relates to amorphous refractory material, and is especially one kind of no-water stemming material for blast furnace taphole and its preparation process. The no-water stemming material is prepared with coke powder 15-25 wt%, clay 10-20 wt%, bauxite corundum 20-36 wt%, silicon carbide 10-20 wt%, asphalt 8-16 wt%, sericite 5-9 wt%, additive 1-5 wt% and binding agent 12-22 wt%, and through crushing, sieving, pre-mixing, rolling, kneading and extruding. The no-water stemming material has excellent plasticity and sintering performance, high strength at high and middle temperature and high slag and molten iron flush resistance, and can meet the requirement of high strength smelting in blast furnace.

The invention relates to an asphalt mixture modifier and an application method thereof; the modifier comprises the following components by mass percentage: more than or equal to 50 percent and less than 100 percent of plastics or recycled waste plastics, and more than o and less than 50 percent of SBS, recycled rubber tire powder, fiber, asphalt or waste oil. The method comprises the following steps: the modifier and mineral aggregate are added into a mixing pot of a mixing plant to be mixed, the temperature of the mineral aggregate is no lower than 170DEG C, and the mixing time is shorter than 10s; and then the asphalt is sprayed in to be mixed when the temperature is no lower than 140DEG C, the mixing time is continued for 35 to 60s, and modified asphalt mixture is prepared. The plastics or the recycled waste plastics in the modifier can be compatible and mixed with the asphalt, and improve various application performance of the asphalt mixture and the overall road performance of a road surface. The method continuously mixes the modifier and the mineral aggregate and the asphalt so that the construction is convenient and the cost is low, simultaneously reduces the aging of the asphalt, saves energy, utilizes the recycled material, and meets the environment protection requirements in a plurality of aspects.

The invention provides a formula of an anti-dezincification extrusion drawing brass pipe and a production method thereof. The method comprises the following production steps: with 46-50% of electrolytic copper, 18-20% of arsenic brass foundry return, 0.2-0.3% of arsenic copper alloy, 0.1-0.3% of boron copper alloy and 30-32% of zinc ingot as raw materials, sequentially performing casting of a solid copper ingot, extrusion of the solid copper ingot into a copper pipe, stretching, annealing, inspection of a finished product of the copper pipe and storage of the finished product of the copper pipe. The brass pipe produced by use of the formula and method provided by the invention has the advantages of relatively good anti-dezincification and anti-corrosion properties and surface quality, light weight, good heat conductivity, high low-temperature strength, firmness and good anti-dezincification and anti-corrosion properties.