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CortenB medium carbon tempered steel, strength, toughness and hardenability are higher than No. 45 steel, tempering treatment can be obtained after a better overall mechanical properties, cutting and machining performance is still good, but the welding performance is poor, the cold deformation plasticity is low, there is a tendency to tempering brittleness, generally used in the tempered state, but also in the quenched and tempered or normalized state. Used in the manufacture of parts subject to wear and tear, such as rotor shafts, mandrels, crankshafts, spline shafts, connecting rods, universal joint shafts, gears, clutch disks, bolts, nuts, etc..
Cowden steel is mainly used for: gas saving, air preheaters, heat exchangers and evaporators in high sulphurous flue gases, to resist the condensation corrosion of sulphurous flue gases. It has the best resistance to sulfur ions, hydrochloric acid and other acidic corrosion. Spiral grooved tubes are the main, economical and proven heat transfer element and have been used in a large number of air preheater products for various boilers. The spiral groove tube utilizes the inner wall and the spiral groove to guide the flow, forcibly perturbing the work material inside the tube, thus improving the heat transfer efficiency. Spiral groove tube heat transfer coefficient can generally reach 1.25 times the same diameter of the light tube, the use of spiral groove tube can improve the efficiency of the heat transfer equipment, reduce the amount of steel pipe, reduce the space occupied by the heat transfer equipment, has a good economy and reliability.
