Definition, Functions, And Standard Codes of High-frequency Welded Steel Pipes

1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993) are also called generally welded steel pipes, commonly known as black pipes. It is a welded steel pipe used to transport water, gas, air, oil, heating steam, and other general lower-pressure fluids and other purposes. The wall thickness of steel pipe connections is divided into ordinary steel pipes and thickened steel pipes; the connection end forms are divided into unthreaded steel pipes (plain pipes) and threaded steel pipes. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is customary to express it in inches, such as 11/2, etc. In addition to being directly used to transport fluids, welded steel pipes for low-pressure fluid transportation are also widely used as the original pipes for galvanized welded steel pipes for low-pressure fluid transportation.

2. A galvanized welded steel pipe for low-pressure fluid transportation (GB/T3091-1993) is also called a galvanized electric welded steel pipe, commonly known as a white pipe. It is a hot-dip galvanized welded (furnace welded or electrically welded) steel pipe used to transport water, gas, air oil, heating steam, warm water, and other general lower-pressure fluids or other purposes. The wall thickness of the steel pipe connection is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the connection end form is divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is customary to express it in inches, such as 11/2, etc.

3. Ordinary carbon steel wire casing (GB3640-88) is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings and installation of machinery and equipment.

4. Straight seam electric welded steel pipe (YB242-63) is a steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc.