steel pipe

    1. The general welded pipe is used for the transportation of general lower pressure fluids such as water, gas, air, oil and heating steam.     2. Ordinary carbon steel wire bushings are steel pipes used to protect electric wires in electrical and industrial installations such as industrial and civil buildings and installation machinery and equipment.     3. straight seam welded pipe is the longitudinal and parallel steel pipe. Usually divided into metric welded pipe, welded thin-walled pipe, transformer cooling oil pipe and so on.     4. Spiral seam submerged arc welded pipe for pressure fluid transport is a hot-rolled steel strip used as a tube blank, is often temperature spirally molded, and welded by double-sided submerged arc welding, used for spiral conveying of pressurized fluids. Steel pipe. The steel pipe has strong pressure bearing capacity and good welding performance. After various rigorous scientific tests and tests, it is s...

    1. The surface of the plated parts is not clean     The surface of the plated parts contains paint, grease, soldering; iron oxide; under-pickling.     2. Pickling and operation     Under-pickling leaves iron oxides on the surface of the plated parts; over-pickling causes the surface structure of the steel substrate to be destroyed. The Si and a small amount of active metal refractory oxides attached to the plated parts prevent Combination of iron and zinc. Or due to over-pickling, the plated parts can absorb hydrogen. When zinc plating, hydrogen gas etc. expands due to heat to escape and miss plating.     The plating parts are superimposed and accumulated during pickling, resulting in missed washing, or due to the structural reasons of the plating parts, they are neglected and turned over, causing vortex gas and missed washing.     3. Assistant plating     The concentration of the additive is low, and ...

    ccording to the function of petroleum casing pipe, it can be divided into surface casing, technical casing and oil layer casing.     1) Surface casing of petroleum casing:     1. It is used to block the unstable and soft, easily collapsed and leaking stratum and water layer in the upper part;     2. Install a wellhead device to control the blowout;     3. Partial weight of support technology casing and reservoir casing.     The depth of the surface casing depends on the specific situation, and is usually tens of meters to hundreds of meters or deeper (30 to 1500 meters). Extracorporeal cement is usually put back on the ground. When drilling high-pressure gas wells, if the upper rock layer is loose and fractured, in order to prevent high-pressure gas flow from the surface, the surface casing needs to be deeper. If the surface casing needs to be deeper, if the first drilling time is longer, the lower layer of the pi...

    "ERW welded steel pipe" is a straight seam resistance welded pipe, abbreviated as ERW. It is used to transport petroleum, natural gas and other vapor-liquid objects, and can meet various requirements of high and low pressure. It currently occupies a pivotal position in the field of transportation pipes in the world.     1. Ordinary welded steel pipe refers to the ordinary "submerged arc welded steel pipe", which is represented by "SC" in electrical engineering. It can be used as a water gas pipe or a threading pipe, which is relatively thick.     2. The line pipe, that is, the wire pipe, is relatively thin. It is indicated by "T" and can only be used as a threading pipe.     3. The ERW steel pipe is a "high-frequency resistance welded steel pipe", which is different from the ordinary welding pipe welding process. The welding self-seam is formed by melting the base metal of the steel belt body, and the mechanical strength is be...