1 . The thicker the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, the more its processing costs will rise significantly.
2 . The process of the product to choose its binding function, the general bellows expansion joint precision is low: uneven wall thickness, low brightness of the tube appearance, the high cost of sizing, and the internal appearance of the pockmark, black spots are not easy to remove.
3 . Its detection and shaping is necessary for off-line processing. Therefore, it reflects its superiority in high pressure, high strength, mechanical structure with materials.
Whether bellows expansion joint or heat-resistant steel plate, austenitic steel plate has the best inductive function, both to meet the strength, but also has excellent plasticity together with the hardness is not high, which is one of the reasons why they are widely used. Bellows expansion joint is similar to most other metallic materials, its tensile strength, yield strength and hardness, following the decline in temperature and progress; plasticity is decreasing with the temperature. Its tensile strength in the temperature range of 1580 degrees to increase is more uniform. What's more, the impact toughness decreases slowly as the temperature decreases, and there is no brittle change in temperature. So the bellows expansion joint in the low temperature can adhere to meet the plasticity and resistance.
