What Are the Classification of Spiral Steel Pipe Welded Pipe?

Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or steel strip after being crimped and welded. Welded steel pipe production process is simple, high production efficiency, many varieties, and specifications, less equipment, but the general strength is lower than seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welds has been continuously improved, the variety and specifications of welded steel pipes are increasing, and they have replaced Seam steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral steel pipe welded pipes in the form of welds.

The straight seam welded pipe production process is simple, high production efficiency, low cost, and rapid development. Spiral steel pipes generally have higher strength than straight-seam welded pipes. Narrow blanks can be used to produce welded pipes with larger diameters, and blanks with the same width can be used to produce welded pipes with different pipe diameters. But compared with the straight pipe of the same length, the length of the weld is increased by 30-100%, and the production speed is lower.

Welded Steel Ssaw Spiral Pipe

Therefore, most of the smaller diameter welded pipes are straight seam welded, while the larger diameter welded pipes are mostly welded steel SSAW spiral pipes.

1. Welded steel pipe for low-pressure fluid transportation (GB / T3092-1993) is also called a general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying water, gas, air, oil, heating steam, and other generally lower pressure fluids and other uses. The wall thickness of the steel pipe is divided into ordinary steel pipe and thickened steel pipe; the form of the pipe end is divided into a non-threaded steel pipe (light pipe) and threaded steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), which is an approximate value of the inner diameter. It is commonly used to express inches, such as 11/2. In addition to being directly used to transport fluids, welded steel pipes for low-pressure fluid delivery are also used as raw pipes for galvanized welded steel pipes for low-pressure fluid delivery.

2. Galvanized welded steel pipe (GB / T3091-1993) for low-pressure fluid transportation is also called galvanized welded steel pipe, commonly known as a white pipe. It is a hot-dip galvanized welding (furnace welding or electric welding) steel pipe used for conveying water, gas, air oil, heating steam, warm water, and other generally low-pressure fluids or other purposes. The wall thickness of the steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the form of the pipe end is divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. The specification of the steel pipe is expressed by the nominal diameter (mm), which is an approximate value of the inner diameter. It is commonly used to express inches, such as 11/2.

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

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

5. Spiral seam submerged arc welded steel pipe for pressure fluid transportation (SY5036-83) is based on hot-rolled steel strip coils, which is often hot spiral formed and welded by double side submerged arc welding method for pressure fluid transportation. Spiral seam steel pipe. The steel pipe has a strong pressure-bearing ability and good welding performance. After various strict scientific inspections and tests, it is safe and reliable to use. The steel pipe has a large diameter, high transmission efficiency, and can save investment in laying pipelines. Mainly used to transport oil and natural gas pipelines.

6. Spiral seam high-frequency welded steel pipe for pressure fluid transportation is a hot-rolled steel strip coil as the tube blank, which is often warm spirally formed and welded by high-frequency lap welding. The high-frequency spiral seam for pressure fluid transportation Welded steel pipe. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing. After various strict and scientific inspections and tests, it is safe and reliable to use. The steel pipe has a large diameter and high transmission efficiency. It is mainly used for laying pipelines for oil and natural gas.

7. The spiral seam submerged arc welding steel pipe for general low-pressure fluid transportation uses hot rolled steel coil as the tube blank, which is often hot spiral formed, and is made of double-sided automatic submerged arc welding or single-sided welding method for water, gas, air Submerged arc welded steel pipes for general low-pressure fluid transportation such as steam and steam.

8. The spiral seam high-frequency welded steel pipe for general low-pressure fluid transportation is a hot-rolled steel coil as the tube blank, which is often hot spiral formed. The high-frequency lap welding method is used for general low-pressure fluid transportation spiral seam high-frequency welded steel pipe.

9. Spiral welded steel pipes for piles are made of hot-rolled steel strip coils, which are often heated and spirally formed, and are made by double-sided submerged arc welding or high-frequency welding. They are used for foundation piles in civil engineering structures, docks, bridges, etc Use steel pipes.