Product characteristics and principles of metal hose

Metal hose sandblasting is to use tight air flow to spray quartz sand on the surface of the steel pipe, the surface is cleaned up or finishing processing sandblasting can be divided into dry sandblasting and wet sandblasting two. The use of sandblasting: remove the castings, forgings or heat treatment of the metal hose surface exists after the type of sand, oxide skin. Remove rust and corrosion on the surface of the metal hose, carbon and welding slag. Advance the surface roughness of metal hose, so as to improve the bonding force of its back side cover foot. Remove the burr and directional abrasion marks on the oral edge of both ends of the metal hose. Make the surface of metal hose matte. Dry sandblasting before preparation, the surface of the metal hose with oil should be removed before sandblasting, and then dried. As the oiled or wet surface affects the sandblasting effect.
Abrasive material is widely used is clean screened quartz sand, more because of its cheap and easy to obtain. Compacted air according to the need to sandblast metal hose wall thickness reference standard selection of suitable pressure, pressure in 0.5 ~ 0.1MPa planning selection requirements for compacted air without oil and water. Metal hose is made of wear-resistant white cast iron or ceramic. The air compressor should be equipped with activated carbon filter, oil and water separator and air package. The metal hose is to collect the sand ejected for recycling, and has dustproof equipment. Martensitic metal hoses have tempering brittleness. So the cooling rate and tempering temperature during tempering is necessary to choose properly. This type of steel as a structural steel use, the impact value of the juggling to give attention to. Tempering cooling rate, it is necessary to follow the required mechanical properties and change. Because most of the pipe fittings are used for welding, in order to improve the quality of welding, the end are turned into a bevel, leaving a certain point of view, with a certain edge, this requirement is also relatively strict, how thick the edge, the point of view for how much and fault planning are rules. The surface quality and mechanical properties are the same as those of the pipe. In order to facilitate the welding, pipe fittings and the connected pipe steel is the same. In the metal hose exterior after nitriding, can largely reduce the possibility of pitting corrosion of metal hose, because the metal hose internal no nitriding, the fundamental mechanical function of metal hose does not change.
Metal hose exterior nitriding can be in the case of not reducing the inductive function of steel to improve the corrosion resistance of metal hose, suitable for use in the environment containing high chloride ions. Nitriding speed, ion nitriding can greatly reduce the nitriding time, especially shallow nitriding is more outstanding, such as nitriding layer depth in 0.3 ~ 0.5 mm, ion nitriding time is only 1/3 to 1/5 of the general gas nitriding time. because ion nitriding can be carried out at a lower temperature, vacuum heating, vacuum cooling can control the heating and cooling speed, so that the uniform, so the deformation than The deformation is smaller than that of gas nitriding.