Welded steel pipe
A welded steel pipe is a steel pipe which is welded and formed by a steel strip or a steel plate and deformed into a circular shape or a square shape, and has a joint on the surface. The blank used for welded steel pipes is steel or strip.welded pipe manufacturers
When the Ni-containing welded steel pipe contains Ni, the corrosion resistance is strong in an acidic environment. In the environment containing sulfuric acid or hydrochloric acid, the higher the content of Ni in the T-welded steel pipe, the stronger the corrosion resistance. In the general environment, it is only necessary to add Cr to the T-welded steel pipe to prevent corrosion. Poor steel edge conditions are another important cause of misalignment. The effect of mass flow, heat flux density and structural parameters (ratio of the diameter of the spiral curvature and the diameter of the T-welded steel pipe Dc/D) on the saturated bubble boiling heat transfer coefficient in the vertical spiral tube.
In the production of T-welded steel pipes, there are many factors influencing the wrong side. In the production practice, the steel pipe is often downgraded by the dry and wrong side. Therefore, it is necessary to analyze the causes of the wrong side of spiral steel pipe and its preventive measures.
Due to the poor shape and dimensional accuracy of the uncut edge of the steel strip, it is easy to cause the steel strip to bend hard and cause a wrong edge. Simulation parameters range: vertical pipe: pipe diameter D=lOmm, pipe length L=660mm; three vertical T-welded steel pipes: pipe diameter D=10mm, the ratio of the curvature diameter of the T-welded steel pipe to the diameter of the spiral pipe is Dc /D=15,20,25, spiral pitch Pt=20mm, tube length L=503mm, L=660mm, L=817MM. Mass flow rate G=200~400Kg/(m’2·s), heat flux density q=5~15KW/m’2, saturation pressure p, saturation=0.414880MPa, saturation temperature T, saturation=283.15K.
GB/T3091-1993 (galvanized welded steel pipe for low pressure fluid transport). It is mainly used to transport water, gas, air, oil and heating water or steam and other general pressure fluids and other uses. It stands for material Q235A grade steel.
GB/T3092-1993 (galvanized welded steel pipe for low pressure fluid transportation). It is mainly used to transport water, gas, air, oil and heating water or steam and other general pressure fluids and other uses. Its representative material is: Q235A grade steel.
GB/T14291-1992 (mineral fluid transport welded steel pipe). It is mainly used for straight seam welded steel pipes for mine pressure, drainage and shaft discharge. It represents the material Q235A, B grade steel. GB/T14980-1994 (large diameter electric welded steel pipe for low pressure fluid transportation). It is mainly used to transport low pressure fluids such as water, sewage, gas, air, heating steam and other uses. It stands for material Q235A grade steel.Galvanized Steel Tube
GB/T12770-1991 (stainless steel welded steel pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. It represents materials 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, and the like.
GB/T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used to transport low pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, and the like.