免费无码观看的av在线播放,香蕉一区二区三区久久亚洲,2023国产精品啪啪视频,欧美成人高清在线网址,中文字幕无线码永久免费2020,极品人妻短裙少妇美腿潮喷

Regarding the casting process of iron pipe, I believe that enterprises are strictly controlled. Our company is no exception to this issue, but in any case, nothing can achieve 100% perfection. As for the casting process, there must be some subtle problems in it. Here we are. Introduce to us:

Compared with reinforced concrete structure, masonry structure and wood structure, the steel pipe has the following characteristics: average material quality, stable quality and good reliability; the actual stress situation is in accordance with the mechanical planning results. Because of its high strength, plasticity and good resistance to shock and vibration, iron pipes are chosen as geometric steel pipes. Therefore, steel structures have light weight, such as ordinary steel roof trusses whose weight is only the same span and load of reinforced concrete roof trusses, which have high industrialization level, and are convenient for transportation, equipment and demolition.

Therefore, the iron pipe has the characteristics of high processing accuracy, short production cycle, high consumption efficiency and fast production speed. It can be used to make pressure vessels and large diameter delivery pipelines. It can withstand the environment of 150 C temporarily, and the steel will not change qualitatively. The iron pipe is transported and used to solve the problem of scrap. Corrosion resistance and fire resistance are poor, iron pipe steel is easy to rust in wet and corrosive medium environment, so rust-proof methods such as rust removal, brushing and galvanizing should be adopted, and live maintenance is needed, so the cost of maintenance is high; when the temperature exceeds 200 C, the quantity of material becomes soft and the strength decreases, and when the temperature exceeds 150 C, fire prevention and heat insulation methods should be adopted for steel structure. 。 Brittle fracture of low paint steel can occur at high temperature and other special conditions. Mold for semi-continuous casting of iron pipe is called crystallizer, commonly known as condensation tank.