high quality 32 inch large diameter steel pipe

High quality 32 inch large diameter steel pipe is a hollow long ring-shaped stainless steel plate. It is mainly used in industrial transportation pipelines and mechanical structures such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instrumentation, etc. Components etc. In addition, when sheet metal bending and torsional strength are the same, the weight is lighter, so it is also widely used in the production of mechanical parts and project structures. It is also commonly used as furniture and kitchen supplies. Let me introduce to you the preparation before welding of stainless steel pipes.

No matter what brazing method is used for high quality 32 inch large diameter steel pipe, the oxide film and oil stains on the surface of the workpiece need to be cleaned before welding. Degreasing can use gas phase degreasing, solvent cleaning, sodium hydroxide aqueous solution cleaning and other methods. Degreasing solvents include ethanol, ether, methanol, acetone and industrial degreasers. Among them, using acetone to clean oil stains on the surface of small batches of workpieces is a simple method. When removing the oxide film on the surface of the workpiece, manual sandpaper grinding can be used for small batches of workpieces; sandblasting or the following pickling methods can be used for large batches of workpieces. The first solution is suitable for removing thick oxide films, and the latter two solutions are suitable for removal. Thin oxide film.

①10% H2SO4, 15% HC, 5% HNO3, balance water. Pickling temperature is 100℃, pickling time is 30s, then use 15% HNO3 aqueous solution for gloss treatment, solution temperature is 100℃, time is about 10s

② 6% H2SO2, 10% HNO3, 50g/LHF aqueous solution. The pickling temperature is 20℃ and the pickling time is 10 minutes. After pickling, wash carefully with 60-70℃ hot water for 10 minutes, and then dry in hot air at 60-70℃.

③NO, 50g/LNaF, 85%H2O solution. Erode at room temperature for 5~10 minutes, then wash with hot water and dry at 100-120℃. Sometimes when a certain brazing material or brazing process must be used for some reason, the brazing material will not easily wet the base material. In this case, a thin layer of material that is easily wetted by the brazing material can be plated on the surface of the base material before brazing. Metals, copper and nickel are commonly used as plating materials.