Boiler Steel Tubes Welding Process Is Different
Boiler Steel Tubes Welding process is different
Boiler steel pipe used in the blank is steel or strip, because of its different welding process is divided into furnace welded pipe, welding (resistance welding) pipe and automatic arc welding pipe. Because of the different forms of welding into boiler steel pipe and spiral welded pipe two. Because of its end shape is divided into circular welded pipe and shaped (square, flat, etc.) welded pipe. Boiler steel pipe production process is simple, high production efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than that of the boiler steel pipe, and the pipe with larger diameter can be produced with the narrow billet. The pipe with different diameter can also be produced with the same width. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low. Weld pipe because of its different materials and uses are divided into the following varieties:
First, GB / T3091-1993 (low pressure fluid transport with galvanized boiler steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other general lower pressure fluid and other use pipe. Its representative material Q235A grade steel. GB / T3092-1993 (Galvanized Boiler Steel Pipe for Low Pressure Fluid Transportation). Mainly used to transport water, gas, air, oil and heating hot water or steam and other general lower pressure fluid and other use of the tube. Its representative material: Q235A grade steel.
Second, GB / T14291-1992 (mine fluid transport boiler steel pipe). Mainly used for mine pressure, drainage, shaft gas with a straight seam steel pipe. Its representative material Q235A, B grade steel. GB / T14980-1994 (Large diameter electric pipe for low pressure fluid delivery). Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluid and other uses. Its representative material Q235A grade steel.
GB / T12770-1991 (stainless steel boiler for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotels and hotel decoration and other mechanical parts and structural parts. Its representative material 0Cr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb and so on.
Third, GB / T12771-1991 (fluid transport with stainless steel boiler steel pipe). Mainly used for conveying low-pressure corrosive media. Representative material is 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 and so on.
Therefore, the smaller diameter of the pipe are mostly used straight seam welding, large diameter welded pipe are mostly used spiral welding. Boiler steel pipe is made of steel or strip after crimping the steel pipe made by welding. Boiler steel pipe production process is simple, high production efficiency, variety specifications, equipment, less, but the general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip rolling and the improvement of welding and inspection technology, the quality of welds has been increasing, and the specifications of boiler steel pipes have been increasing day by day. Sewing steel pipe. Boiler steel pipe in the form of welds into boiler steel pipe and spiral welded pipe. City gas boiler steel pipe, including gas boiler steel pipe, the distribution of boiler steel pipe, the user into the tube and indoor gas boiler steel pipe, the boiler steel pipe has a different purpose. (0.01 ~ 0.4MPa), secondary pressure (0.4 ~ 1.6MPa) and high pressure (1.6 ~ 4.0MPa), which can be divided into low pressure (not higher than 0.01MPa), different pressure. In general, the higher the pressure of the boiler steel pipe, boiler steel pipe leakage the greater the possibility of the quality of the boiler steel pipe is also higher; but the use of higher pressure boiler pipe, you can reduce the initial investment in the pipe network. Different uses, different pressures and different diameter of the boiler steel pipe, it must have different materials and different processes.