Straight seam steel pipes can be divided into many different specifications and names, including straight seam welded pipes, double-sided submerged arc welded pipes, thick-walled straight seam steel pipes, straight seam steel pipes, large-diameter straight seam steel pipes, API5L straight seam steel pipes, JCOE large-diameter straight seam welded pipes, large-diameter straight seam welded pipes, welded straight seam steel pipes, double-sided submerged arc spiral welded steel pipes, straight seam structural pipes, PSL2 steel pipes, X-grade steel pipes, L-grade steel pipes, large-diameter thick-walled submerged arc welded steel pipes, large-diameter straight seam steel pipes, carbon steel straight seam steel pipes, ordinary carbon steel pipes, API5L, X80 steel pipes. Straight seam steel pipes are mainly used in tap water projects, the petrochemical industry, the chemical industry, the power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas; for structural use: for piling pipes, docks, roads, building structure pipes, etc.
1. The site or warehouse for storing straight seam steel pipe products should be clean and well-drained, away from factories and mines that produce harmful gases or dust. Weeds and debris should be removed from the site to keep the steel clean;
2. It should not be stacked together with materials that are corrosive to steel, such as acid, alkali, salt, cement, etc. in the warehouse. Different types of steel should be stacked separately to prevent confusion and contact corrosion;
3. Large steel, rails, steel plates, large-diameter steel pipes, forgings, etc. can be stacked in the open air;
4. Small and medium-sized steel, wire rods, steel bars, medium-diameter steel pipes, steel wires and wire ropes, etc. can be stored in ventilated material sheds, but with tarpaulins on top and pads underneath;
5. Some small steel, thin steel plates, steel strips, silicon steel sheets, small-diameter or thin-walled steel pipes, various cold-rolled and cold-drawn steels, and expensive and easily corroded metal products can be stored in warehouses;
6. The warehouse should be selected according to geographical conditions. Generally, ordinarily, closed warehouses are used, that is, warehouses with roofs, walls, tight doors and windows, and ventilation devices.
As for the effect of deoxidizer on straight seam steel pipe, we have summarized the following contents:
For straight seam welded pipe with ω(Als≤0.01%, the use of two deoxidizers has little effect on the total oxygen content in the steel after VD treatment, and both can control ω(T.O below 20×10-6; after Si-Al-Ba deoxidation, lower total oxygen content can be obtained in each process, and the deoxidation effect of each process is stronger than that of Si-Ca deoxidation. When two different deoxidizers, Si-Ca and Si-Al-Ba, are used in straight seam welded pipes, the number and size of inclusions in the smelting process are quite different. The number of inclusions in each process after Si-Al-Ba deoxidation is less than that after Si-Ca deoxidation, and the size is smaller. When two different deoxidizers, Si-Ca and Si-Al-Ba, are used in straight seam welded pipes, the molten steel undergoes obvious secondary oxidation during the casting process, but the secondary oxidation of Si-Al-Ba deoxidized molten steel is more serious. The composition of inclusions in forging materials and the content of aluminum inclusions are quite different, When Si-Al-Ba is used for deoxidation, the inclusions in the forging are mainly blocky and chain-shaped alumina. When Si-Ca is used for deoxidation of straight seam welded pipes, the inclusions in the forging are mainly strip-shaped silico-manganese-aluminate composite inclusions; the content of aluminum inclusions in Si-Ca alloy deoxidized forgings is less than that of Si-Al-Ba alloy deoxidation.
In addition, the production process of thick-walled straight seam steel pipes and large-diameter thick-walled steel pipes generally includes hot rolling, hot coiling, casting, and other production methods. Large-diameter thick-walled steel pipes are generally processed using double-sided submerged arc welding production processes. The products are subjected to multiple processes such as bending, seaming, internal welding, external welding, straightening, and flattening to meet the requirements of petrochemical standards. The purpose of thick-walled straight seam steel pipes is mainly used for body support parts, such as bridge piling, seam piling, and high-rise building piling. The materials used are generally Q345B and Q345C. Q345D and Q345E large-diameter thick-walled steel pipes are also used in areas with lower temperatures and are mostly used in large-scale steel structure construction.
Post time: Jan-03-2025