Seamless Steel Pipe Speeds Up Construction Progress
Date:2019-11-26View:776Tags:Seamless Steel Pipe Speeds Up Construction Progress
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Seamless steel pipe also plays an important role in the construction industry. Steel pipe is not only the raw material of construction, but also a very important construction tool in the construction industry.
Because of the relationship between space and profit, the floors are higher and higher, which brings some difficulties to the construction of high-rise buildings. Without relatively safe construction tools, high-rise buildings cannot be carried out in an orderly manner. Here, the role of seamless steel pipe can be reflected. Because the toughness of ordinary steel pipe is not very good, many steps are needed in the construction of steel pipe scaffold, which increases the construction time. Different from seamless steel pipe, the steel pipe adopts cold drawing and hot rolling process, so its toughness is very good. In the process of processing these steel pipes, processing can be carried out without adding measures to protect the steel pipes. A lot of time can be saved by installing and dismantling steel scaffolds.
Seamless steel pipe is a long steel strip with hollow section and no joints around. The length of seamless pipe is 3000-12000mm, including 6m. Seamless pipes on the market are usually not fixed, mostly 6, 9 and 12 meters. The normal length of steel pipe is as follows: hot rolled steel pipe 3000-12000mm, cold drawn steel pipe 3000-10500mm; double end rolled (processed) steel pipe can reach 80m or longer, but in actual production, the general finished seamless steel pipe is less than 12M, which is mainly for the convenience of transportation.
Seamless steel pipe is divided into hot-rolled (extruded) seamless steel pipe and cold drawn (rolled) seamless steel pipe due to different manufacturing processes. Cold drawn seamless steel pipe is a product that appears in recent years, mainly with strict tolerance and roughness of inner and outer wall dimensions.
1. The outer diameter is small.
2. It can produce high precision in small batch.
3. Cold drawn (rolled) seamless steel pipe, with high precision and good surface quality.
4. The cross-sectional area of cold drawn seamless steel pipe is more complex.
5. The cold drawn seamless steel pipe has superior performance, and the seamless steel pipe is relatively compact.
6. When the cold drawn seamless steel pipe is loosened, the inner and outer diameter can be controlled within 10 lines according to the customer's requirements.
The rolling method of cold drawn (rolled) seamless steel tube is more complicated than that of hot rolled (extruded) seamless steel tube. The first three steps of their production process are basically the same. The difference starts with step four. After the billet is hollowed out, annealing needs to be started. After annealing, pickling with special acid liquid. After pickling, apply oil. The next step is to carry out multi pass cold drawing (cold rolling) on the empty tube, and then carry out special heat treatment. After heat treatment, straighten it. After the steel pipe is straightened, it is sent to the metal flaw detector (or water pressure test) through the conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be found. After the quality inspection of steel pipes, they must be carefully selected by hand. After the quality inspection of steel pipe, paint number, specification, production batch number, etc.
