FIELD: chemistry.SUBSTANCE: invention relates to rubber production, in particular, to production of electroconductive elastomers with positive thermal coefficient of resistance (PTCR) based on regenerate from tire wastes and current-carrying technical carbon. Described is an electrically conductive rubber mixture with a positive thermal coefficient of resistance (PTCR), comprising a tire regenerate obtained by devulcanisation of rubber crumbs in a medium of stearic acid, electroconductive technical carbon CH85, altax, diphenyl guanidine and sulphur, with the following ratio of initial components, wt. pts.: tire reclaim obtained by devulcanisation of rubber crumbs in stearic acid medium - 100.0, electroconductive technical carbon CH85 -10.0–20.0, altax - 1.0, diphenylguanidine - 0.5, S - 1.0.EFFECT: technical result is conduction of rubber with electric conductivity plate regenerate with positive thermal coefficient of resistance.1 cl, 1 tbl, 5 ex

Current-conducting rubber with positive thermal coefficient of resistance based on reclaimed waste from tire wastes

FIELD: metallurgy.SUBSTANCE: invention relates to the field of metallurgy. Method of making a steel element comprises steps of carburising the steel element. Carburisation, pearlitizing of austenite and hardening of the steel element are carried out, wherein pearlitizing of the austenite includes a first treatment for separating perlite, performed by cooling the steel member to a first temperature which is lower than the temperature of the beginning of the austenitic transformation and higher than 680 °C, and holding the steel member at a first temperature to pearlitizing part of the austenite obtained during the cementing of the steel member and a second pearlite separation treatment performed by further cooling the steel member to a second temperature which is equal to or less than 680 °C and higher than "nose" temperature, and holding the steel member at a second temperature to pearlitizing the austenite remaining after the first pearlite separation treatment.EFFECT: high fatigue strength of the steel member.5 cl, 9 dwg

Method of making steel element

FIELD: gas industry.SUBSTANCE: invention relates to the field of operation of gas distribution stations of gas trunk-lines (hereinafter-GDS), in particular, purging of gas purification units (hereinafter - GPU). The technical result is efficient use of the resource through natural gas conservation, which, instead of being released into the atmosphere, it is fed into the output pipeline of the GDS after additional purification. The technical result is achieved by the fact that the gas ejection unit is additionally mounted at the GDS. The ejection line with a small cleaning filter, pressure gauges and a valve is connected to the equalization pipeline after its valve. A line of active gas with valves is cut in after the output valves of the GPU up to the input valves of the pressure regulators. The output line with the output valve is connected to the equalizing pipeline between the place of its insertion into the output pipeline of the gas distribution station and the bypass valve of the ejection unit connected to the ejection line between the small purification filter and its valve. The high-pressure blown gas is bypassed from the GPU through the drainage pipeline to an enclosed condensate trap. Gas from the condensate trap is fed through the equalizing pipeline to the low-pressure GDS output pipeline. After reaching the pressure in the condensate collector equal to the pressure in the output pipeline of the GDS, and the gas remaining in the condensate collector is ejected into the output pipeline of the GDS.EFFECT: efficient use of the resource through natural gas conservation, which, instead of being released into the atmosphere, is fed into the outlet pipeline of the GDS after additional purification.1 cl, 1 dwg

Method of no-waste purging of gas purification units

FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular, to chemical-thermal treatment of structural and tool steels, and can be used for surface hardening of parts of machines and process equipment of dies, molds, draw plates in machine building and other industries. Cementation paste is applied on part surface, heated with subsequent holding, quenching and tempering. Cementation paste contains powdered components: sodium carbonate NaCO, bentonite, marshalite, soot DG-100 in the following ratio, wt%: sodium carbonate NaCO20–30, bentonite 5–10, marshalite 10–20, soot DG-100 is the rest, wherein the polyethylene-emulsion emulsion is used as a polyvinyl acetate emulsion in amount of 30–50 % of the weight of the powder components, prepared from PVA glue 60 %, 15 % methanol and 25 % water. Paste is applied on the part, dried at temperature of 80–90 °C, then the part is heated to 920–980 °C for 6–8 hours, then hardened and tempered at 200–550 °C for 2 hours.EFFECT: enabling machining of parts of any size and shape, high uniformity of heating of parts and rate of their cementation, as well as high environmental safety of carbonation process.1 cl, 1 ex

Method for cementing parts from structural and tool steels

FIELD: metallurgy.SUBSTANCE: invention relates to steel items carbonization, and can be used for surface hardening of machine an machinery parts out of low-carbon steel. Items are carbonized in solid carburizing compound, then they are cooled, subjected to double hardening and low-temperature tempering. The carbonization is performed at 900°C. The following compound is used as solid carburizing compound, containing in wt %: cast-iron shaving with average grains size 0.5 mm - 10, barium carbonate BaCO- 10, and carbonic substance with fibrous structure - 80 comprising in wt % iron - 10, hydrogen - 0.8, and carbon - 89.2, that is produced by catalytic thermal pyrolysis of the associated petroleum gas of Bayadynskoe Field under contact with iron oxide catalysts at temperature 660°C, with feed space velocity 1000 hoursfor 3 hours with further screening of the fraction 100-250 micron by fractionation of the created mass in molecular sieves. After carbonization the items are cooled to 100°C, then subjected to double hardening including first hardening at 820°C, and second hardening at 770°C, then low tempering is performed at 150°C.EFFECT: required diffusion saturation by carbon is ensured, uniform depth of the layer over the item is ensured, reduced power consumption, and reduced needed in cooling by water solution of the cooling liquid and emulsifier addition.3 tbl

Strengthening method of items from low-carbon steel

FIELD: chemistrySUBSTANCE: method involves curing a rubber mixture at the temperature of 150°C, containing, wt %: SKN-18 - 40 rubber, a vulcanization polysulphide accelerator - 12, dibutyl phthalate - 1, diamine - 1, phthalic anhydride - 1, a carbon filler - 40, regenerate - 5 Herewith the carbon filler material used is the carbonaceous material of the fibrous structure obtained by thermocatalytic pyrolysis of gas condensate from the natural gas purification system at the compressor station of the main gas pipeline under conditions of contact with the iron oxide catalyst FeOat atmospheric pressure and at the temperature of 600-700°C, a bulk feed rate of 25 ml/min, for 5 hours, followed by cooling to 20°C and screening of 50-150 mcm fraction by fractionation of the formed carbon mass on molecular sieves The finished rubber vulcanizate is subjected to additional heat treatment in a thermostat at the temperature of 250°C for 3 hoursEFFECT: increasing the yield of the target product, the relative stability of the conductive properties over time, and simplifying the technology for producing the product3 tbl

Method of producing electroproductive rubber volcanizate with carbon filler

FIELD: machine building.SUBSTANCE: invention relates to the carbonisation of steel items, and can be used for surface strengthening of the machine parts and machinery by means of the heat treatment in solid carboniser. The carboniser for the carbonisation of the low carbon steel items contains in form of the by-product of the incomplete combustion of the natural gas in the gas-operated heat generating equipment of the gas distribution and compressor stations of the main gas lines, cast iron shavings with average size of pellets 0.5 mm, and barium carbonate, upon the following components ratio in wt %: fine-grained soot - 80, cast iron shavings - 10, and barium carbonate - 10.EFFECT: assurance of required diffusion saturation of steel items with the carbon, uniform depth of layer over the item area, and reduced energy consumption.3 tbl, 2 ex

Carboniser for carbonisation of low carbon steel items

FIELD: gas industrySUBSTANCE: invention relates to the field of gas industry, in particular to objects of the main gas pipeline, and can be used to reduce natural gas losses during operation of the condensate collection unit of the process gas purification system of a compressor station In the current scheme of the condensate collection unit of the process gas purification system of the compressor station, which includes two technologically interconnected underground tanks, tied with pipeline fittings using high and low pressure pipelines, according to the invention, a high pressure gas outlet pipe is installed with pipeline and shut-off and control valves between the purge gas pipeline of the first underground condensate collection tank and the inlet gas pipeline to the fuel and start-up gas unit; low pressure gas outlet pipe was installed with pipeline and shut-off and control valves between the purge gas pipeline of the second underground condensate collection tank and the inlet gas pipeline to the gas heater burner unit; tap is installed with shut-off and control valves between the low-pressure gas pipeline and the low-pressure gas burner unit and the inlet gas pipeline to the hot-water boiler burners unit of the backup boiler houseEFFECT: object of the invention is resource saving due to the economy of natural gas, which instead of being vented to the atmosphere from two underground condensate collection tanks, technologically interconnected, is used to supply high-pressure gas as an input gas to the fuel and start-up gas unit for its own technological needs of the compressor shop and as low-pressure fuel gas for gas heater burner units and hot water boilers of the backup boiler compressor station1 cl, 1 dwg, 3 tbl

Condensate collection unit of process gas purification system of compressor station

FIELD: chemistry.SUBSTANCE: invention relates to cementation of steel articles and can be used for surface hardening of parts of machines and mechanisms by their heat treatment in medium of solid carburizer. Composition of carburizer for carburizing articles from low-carbon steel contains, wt. %: iron chips with average size of granules of 0.5 mm - 10, barium carbonate BaCO- 10 and carbon substance - 80. Carbon substance consists of, in wt. %: amorphous carbon - 96.2, crystalline carbon - 2.85, iron - 0.94 and hydrogen - 0.01 and obtained by thermo-catalytic pyrolysis of gas condensate, taken from condensate collector of gas distribution station, under conditions of contact with iron oxide catalyst FeOat temperature of 550 °C, bulk feed rate of volume of 30 ml/min, for 5 hours, with subsequent screening of 50–150 mcm fraction by fractionation of formed mass on molecular sieves.EFFECT: providing required diffusion saturation with carbon, achieving uniform depth of layer along the area of the product and reducing power consumption.1 cl, 2 ex

Galikeev Artur Rifovich

Papers

Strengthening method of items from low-carbon steel

Method of producing electroproductive rubber volcanizate with carbon filler

Carboniser for carbonisation of low carbon steel items

Condensate collection unit of process gas purification system of compressor station

Carburizer composition for carburizing parts from low-carbon steel