31results about How to "Moderate cooling rate" patented technology

The invention relates to a sand mold casting copper anode mould technique which is characterized in that the following steps are included: a. the modeling materials according to the parts by weight: 1part of 70-140 meshes of refined quartz sand, 0.05-0.1 part of kaolin, 0.01-0.005 part of graphite powder, 0.05-0.08 part of 2.4-2.6m of soluble glass, 0.005 part of 20-30 percent of sodium hydroxidesolution, a proper amount of 98 percent of ethanol and colophony which are evenly mixed, sanded, modeled, modified and hardened by CO2; b. the processes of demoulding, drying, painting the coating and mould assembling are carried out; c. the anode molten copper which is smelted to be eligible in an anode smelting furnace is casted into a box for temperature preservation for 20-40 hours and is demoulded; d. the finished product can be obtained after desanding and polishing. The invention leads the traditional sand mold casting technique to be used for the casting of the copper anode mould andutilizes the handpicked modeling materials so as to ensure that the shortages of air holes, gas pockets, cold shut, and the like, of the casted copper anode mould are avoided basically, the manufacture cost is low and the quality of the anode copper can be improved.

The invention provides a rapid cooling method after a medium and thick plate heat treatment furnace. The method comprises the following steps of: in the conveying process of steel plates treated by using a heat treatment furnace, preliminarily reducing the temperature of the steel plates in a gas blowing mode, and further reducing the temperature of the steel plates in a contact cooling mode. A rapid cooling device after the medium and thick plate heat treatment furnace comprises an air cooling mechanism and a roller cooling mechanism which are sequentially arranged behind the heat treatment furnace, wherein the air cooling mechanism comprises a roller way for conveying the steel plates, and a cooling spray pipe for spraying cooling gas to the steel plates in the conveying process; and the roller cooling mechanism comprises a plurality of water-cooled conveying rollers which are used for exchanging heat with the steel plates in the conveying process. Compared with cooling bed equipment and other cooling modes, the rapid cooling device and the rapid cooling method have the advantages that: auxiliary equipment and processes such as loading and unloading are not required, and the steel plates are cooled in the conveying process, so that the equipment cost is reduced, and the cooling efficiency is also improved.

The invention discloses a heat treatment process with regard to silicon-manganese alloy spring steel, and belongs to the technical field of heat treatment processes for spring steel. According to the invention, heat treatment steps comprising heating, quenching and tempering can be carried out with regard to the silicon-manganese alloy spring steel, and the heat treatment process is scientific and reasonable in design, and capable of effectively preventing the silicon-manganese alloy spring steel from decarburization and graphitization tendencies; a quenching liquid used in the heat treatment process is safe, environment-friendly and non-toxic, capable of effectively replacing the original oil-based quenching medium with high energy consumption and high pollution, long in service life, and excellent in quenching effect; and in addition, the silicon-manganese alloy spring steel treated through the process is capable of achieving a finished product state, and provided with a layer of anti-rust film, so that additional shot-blasting and painting processes are not needed, and the heat treatment process is more economic and convenient.

The embodiment of the present invention provides a hot-rolled steel strip for a 610MPa-level automobile frame, the chemical composition and weight percentage of the hot-rolled steel strip for a 610MPa-level automobile frame are: carbon C: 0.060-0.090%, silicon Si : 0.10~0.20%, manganese Mn: 1.35~1.50%, phosphorus P≤0.020%, sulfur S≤0.008%, aluminum Als: 0.015~0.050%, niobium Nb: 0.035~0.045%, titanium Ti: 0.035~0.045%, Nitrogen N≤0.0045%, the balance is Fe and unavoidable impurities.

The invention discloses a steel rail heat treatment device. The steel rail heat treatment device comprises a heat treatment mechanism, a water supply mechanism, a gas supply mechanism, a main frame and a steel rail holding mechanism for holding a steel rail. The heat treatment mechanism comprises a pressure-stabilized air bellow, the pressure-stabilized air bellow is connected with an upper air bellow, a lower air bellow, a left air bellow and a right air bellow through a small vent pipe correspondingly, and first nozzles are arranged on the upper air bellow, the lower air bellow, the left air bellow and the right air bellow correspondingly; the first nozzle of the upper air bellow is arranged over the steel rail, the first nozzle of the lower air bellow is arranged under the steel rail, and the central axes of the first nozzle of the upper air bellow and the first nozzle of the lower air bellow coincide with the central axis of the steel rail; the first nozzle of the left air bellow and the first nozzle of the right air bellow are symmetrically arranged on the two sides of the steel rail; the water supply mechanism and the gas supply mechanism are connected with the pressure-stabilized air bellow correspondingly, and the steel rail holding mechanism is arranged in the main frame. The invention further provides a steel rail heat treatment method. The steel rail heat treatment device and the heat treatment method are easy, the operation is convenient, and the heat treatment effect of the steel rail can be ensured.

The embodiment of the present invention provides a method for producing a hot-rolled steel strip for a 610MPa-level automobile frame. The production process steps for the hot-rolled steel strip for a 610MPa-level automobile frame include: converter smelting, LF furnace refining, continuous casting, and rolling plan Arrangement, slab heating, rough rolling, high-pressure water descaling, finishing rolling, laminar cooling, coiling and stack cooling; the chemical composition and weight percentage of the hot-rolled steel strip for the 610MPa grade automobile frame are: carbon C: 0.060~0.090%, silicon Si: 0.10~0.20%, manganese Mn: 1.35~1.50%, phosphorus P≤0.020%, sulfur S≤0.008%, aluminum Als: 0.015~0.050%, niobium Nb: 0.035~0.045% , titanium Ti: 0.035-0.045%, nitrogen N≤0.0045%, the balance is Fe and unavoidable impurities.

The invention discloses a slitting cutting disc and a preparation method thereof, which belong to the process field of cutters. The slitting cutting disc is of a circle blade, and comprises a center hole, a cutter disc and a blade, wherein the center hole is arranged in the center of the cutter disc, the blade is arranged on an outer ring of the cutter disc, a blade opening is arranged on an outer ring of the blade, and the opening angle delta ( ) of blade opening is 23-27 degrees. The opening thickness h of the blade opening is 0.24-0.26mm. The materials which are made into the slitting cutting disc comprise components with percentage by weight: carbon (C) 1.15-1.33%, nitrogen (N) 0.2-0.4%, manganese (Mn) 0.30-0.40%, silicon (Si) 0.52-1.20%, chromium (Cr) 8.50-10.50%, tungsten (W) 1.50-2.50%, vanadium (V) 0.35-0.50%, molybdenum (Mo) 0.25-0.4%, nickel (Ni) 0.30-0.40%, copper (Cu) <=0.30%, sulphur (S)<=0.020% and phosphorus (P)<=0.027%, and the allowance is ferrum (Fe). The slitting cutting disc has the advantages that the slitting cutting disc is excellent in abrasive resistance and is not easy to deform, and the blade opening resists abrasion, not easy to crack, long in service life and easy to make.

The invention discloses environmental protection water-solubility quenching liquid, which, by weight, comprises components of 25-90% of polyether, 2-50% of water, 0.1-10% of triethanolamine, 0.1-10% of anticorrosive agent, 0.1-5% of dirty restrain agent, 0.1-5% of washing dispersing agent, 0.01-0.1% of antifoaming agent and 0.1-3% of fungicide. The polyether molecular weight is 30000-50000. The water-solubility quenching liquid is compounded with balanced rust-inhibiting additive and the washing dispersing agent, has great cooling speed in a high-temperature cooling stage, can refine grains, has moderate cooling speed in a low-temperature cooling stage, effectively solves cracking and deformation problems in a workpiece cooling process, and improves surface quality of a workpiece. Excellent rust-proof performance effectively protects the quenched workpiece, and rust-proof requirements between working procedures are completely met. The environmental protection water-solubility quenching liquid has prominent surface cleaning performance, scale cinder is avoided, output quantity is small, production efficiency is improved, and production cost is saved.