Bluing packaging showed how horizontal stripes formed?

Bluing packaging showed how horizontal stripes formed? Control bluing pack panel appears horizontal stripes should grasp several factors? When bluing packing belt and appear beyond the yield limit of stress from the elastic zone to the sudden change of plastic zone, due to the effect of yield platform, bluing pack section will cause uneven local flow deformation, yield will appear on the surface of horizontal stripes. Which is due to his air masses caused the micro screw anchor effect. Solute atoms in elastic interaction with dislocation, can slant in place around the fault, his so-called air mass. At this point, the dislocation to movement must be free from the air or dragging air mass movement together, thus make the bluing pack produced a yield platform. Based on the above principle, control panel horizontal stripes should grasp the following several factors: ( 1) Material composition. Generally speaking, the higher the carbon and nitrogen content in steel plate, carbon and nitrogen atoms, the more obvious, the function of his air masses screw anchor yield platform becomes more significant, the greater their chances of horizontal grain defects. ( 2) Annealing process. Experience shows that produce the same specification, same material of bluing packing belt, annealing furnace has a slow cooling period than slow cooling period of production of bluing packaged with horizontal grain risk of small defects. Annealing furnace had a limitation period than bluing packaged without limitation period of production with horizontal grain risk of small defects. This is because the cooling speed is related to cause yield platform elements carbon, nitrogen in solid solution in size, degree of supersaturation of overaging relationship to carbon, nitrogen, the degree of precipitation. The longer the greater the degree of supersaturation yield platform; The longer the aging time, the shorter the yield platform. ( 3) After annealing cooling way. Such as bluing packaged with higher temperature directly into the temper mill or pull machine, when the zone temperature is more than 45 ℃, the defect in the susceptible to horizontal stripes and horizontal grain defect, the more obvious with the increase of temperature.