SPIRAL STEEL PIPE CLEANING AND PREHEATING TREATMENT

Spiral steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agriculture, rural construction, tianjin round steel factory sales network in more than 20 provinces and cities, the development of twenty one of the key products. For liquid transportation, water supply and drainage. For gas, gas, steam, liquefied petroleum gas. For structure: piling pipe, bridge; Dock, road, building structural tube, etc. Spiral steel pipe spiral steel pipe production process in strip steel coil plate for raw materials, often warm extrusion molding, with automatic double wire welding double-sided submerged arc welding technology with the spiral seam pipe.

Of steel pipe derusting displacement speed depends on the type of abrasive and abrasive, abrasive per unit of time applied to steel tube, the total kinetic energy E and the kinetic energy of single abrasive particles E1. Emphasis on the importance of surface treatment in the production, strictly control the descaling process parameters, in actual construction, the steel pipeanticorrosion layer of the peel strength value of more than standard requirements, to ensure the quality of the anticorrosive coating, on the basis of the same equipment, improve the technological level, reduce the production cost. Type: m – abrasive jet (left); V – abrasive speed; M1 – the quality of single abrasive particles. M size is associated with abrasive grinding rate, broken rate size directly affect the cost of surface treatment and the cost of cleaning equipment. When the device is fixed, m is constant, y is constant, so E is a constant, but as a result of abrasive, m1 change, therefore, generally should choose the abrasive attrition rate is low, so clear to improve speed and long blade life.

Spiral steel pipe cleaning and preheating before spray (cast) shoot processing, adopt the method of cleaning to remove oil on the surface of the steel tube and fouling, the heating furnace for preheating tube body a 60 to 40 ℃, the steel pipe surface dry state. In spray (cast) processing, due to steel tube surface oil free of dirt, can strengthen the effect of cleaning, drying of the surface of the steel tube also is helpful for steel shot, steel grit and the separation of rust and scale, make after cleaning of steel tube surface clean.