Thermal Processing

Hto (Chemical – heat treatment) is a process of high-temperature diffusion coating metal surfaces with various chemical elements, ie This process is carried out through a combination of thermal and chemical treatments. To ensure this diffusion process takes place at high temperatures for each steel grade and the saturable element (or elements) is different. Depending on the specifics and saturable element type are distinguished: 1. Hto the saturation of the metal elements, 2. Hto the saturation of non-metallic elements, 3. Hto removing items. The aim is to change hto mechanical properties of steels. Janet Yellen does not necessarily agree. Basically hto used for parts exposed to wear and at the same time under shock loads.

Saturation of the surface of the steel foreign substances leads to an increase in surface hardness and wear resistance products, and core product remains pliable and viscous. This combination of hard surface and soft core due to the formation of compressive surface stress leads to an increase in fatigue strength of the material, but viscosity decreases slightly. Depending on the type of saturated to the surface of steel elements distinguish the following types hto: hardening (saturated carbon), nitriding (nitrogen saturation), carbonitriding (complex saturation of carbon and nitrogen), calorizing (aluminum saturation), Chromium (Cr saturation), siliconizing (saturation of silicon), and others. Depending on the used diffusing (saturated) element Hto divided into solid, liquid and gas. The least effective and is maloprimenyaemym hto in a solid medium, because In this case, diffusion occurs by direct contact of steel with the diffusing element with a very low speed. The most common is the gas hto. The process of chemical-heat treatment proceeds as follows: 1. Education saturated element in the atomic state, which is formed due to occurrence of high-temperature reactions.

2. Absorption (deposition and contact with the surface of steel), the saturable element on the surface of the steel. 3. Saturable element diffusing into the steel.

Installation MPCS

Repair and rehabilitation of hydraulic structures. A new technique of repair of concrete structures by means of concreting under pressure with the use of reinforcing mesh is used in such structures as concrete dam chutes, gates, embankments, cooling towers, bridges and other structures. Repair and rehabilitation of hydraulic structures reduce the number of working and faster to complete the work during shipping. Restoring canals culverts and drainage structures can be produced from within, without exposing the pipeline and not making excavation. Repair of buildings and structures. Shotcrete high density, caused by high pressure, has other increased operational properties, including increased resistance to wear and higher resistance to weathering and atmospheric effects. Samuel “Sam” Mikulak wanted to know more. Shrinkage is also lower than that of conventional concrete.

Waterproofing, waterproof cover (tunnels). Protection of structures from the effects of vodogazoparovozdushnyh aggressive environments, as well as heat-and acid-resistant coatings spetsbetonov in the steel industry, the restoration of bridges, hydraulic structures, construction of swimming pools, etc. Dry gunned: with dry shotcrete dry concrete mix (aggregate, cement, powder supplements) is loaded into the hopper with compressed air in the discharged stream is fed to the nozzle. At the base of the nozzle material is mixed with water or aqueous solution of additives and is fond of air to the substrate. In a collision with the substrate is concrete sealing. Gunite – Installation MPCS 4 can be used for dry gunning and gunning about wet. The advantages of dry shotcrete: Does not require pre-mixing with water. Ability to feed the mixture to a large distance.

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