What is the purpose of steel pipe???

Classification by use: steel pipe for pipeline, steel pipe for thermal equipment, steel pipe for mechanical industry, steel pipe for petroleum, geological drilling, steel pipe for vessel, steel pipe for chemical industry, steel pipe for special purpose and others 4. Chemical composition inspection


For example: 1. Welded steel pipe for low pressure fluid transmission (GB / t3092-1993) is also called general welded pipe, commonly known as black pipe. It is used to transport water, gas, air, oil, heating steam and other general low pressure fluid and other purposes of welded steel pipe. The connection wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe; the connection end type is divided into non threaded steel pipe (bare pipe) and threaded steel pipe. The specification of steel pipe is expressed by nominal diameter (mm), which is the approximate value of inner diameter. It is usually expressed in inches, such as 11 / 2, etc. The welded steel pipe for low pressure fluid transportation is not only used to transport fluid directly, but also used as the original pipe of galvanized welded steel pipe for low pressure fluid transportation.

2. Galvanized welded steel pipe for low pressure fluid transmission (GB / t3091-1993) is also called galvanized welded steel pipe, commonly known as white pipe. It is a kind of hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for conveying water, gas, air, oil, heating steam, warm water and other general low pressure fluid or other purposes. The connection wall thickness of steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the connection end type is divided into galvanized steel pipe without thread and galvanized steel pipe with thread. The specification of steel pipe is expressed by nominal diameter (mm), which is the approximate value of inner diameter. It is usually expressed in inches, such as 11 / 2, etc.

3. Ordinary carbon steel wire sleeve (gb3640-88) is a steel pipe used to protect wires in electrical installation engineering such as industrial and civil buildings and installation machinery and equipment.

4. Straight seam electric welded steel pipe (yb242-63) is a kind of steel pipe whose weld is parallel to the steel pipe longitudinally. It is usually divided into metric welded steel pipe, welded thin-walled pipe, transformer cooling oil pipe and so on.

5. Spiral submerged arc welded steel pipe (SY5036-83) for pressure fluid transportation is a kind of spiral welded steel pipe for pressure fluid transportation, which is made of hot-rolled steel strip coil as tube blank, and is often spiral shaped and welded by double-sided submerged arc welding. The steel pipe has strong pressure bearing capacity and good welding performance. After various strict scientific inspection and testing, it is safe and reliable to use. The diameter of steel pipe is large, the conveying efficiency is high, and the investment of laying pipeline can be saved. It is mainly used to transport oil and natural gas pipelines.

6. Spiral high frequency welded steel pipe (sy5038-83) for pressure fluid transportation is a kind of spiral high frequency welded steel pipe for pressure fluid transportation, which is made of hot-rolled steel strip coil as tube blank, often warm spiral forming and welded by high frequency lap welding method. The steel pipe has strong pressure bearing capacity, good plasticity, and is easy to weld and process; through various strict and scientific inspection and testing, it is safe and reliable to use, with large diameter of steel pipe, high conveying efficiency, and can save the investment of laying pipeline. It is mainly used for laying pipelines for transporting oil and natural gas.

7. The spiral submerged arc welded steel pipe (SY5037-83) for general low-pressure fluid transportation is a kind of submerged arc welded steel pipe for general low-pressure fluid transportation, such as water, gas, air and steam, which is made of hot-rolled steel strip coil as tube blank, regular warm spiral forming, double-sided automatic submerged arc welding or single-sided welding.

8. The high frequency spiral welded steel pipe (sy5039-83) for general low-pressure fluid transportation is made of hot rolled steel strip coil, which is often spiral shaped at high temperature and welded by high frequency lap welding method. It is used for general low-pressure fluid transportation.

9. The spiral welded steel pipe for pile (sy5040-83) is made of hot rolled steel strip coil as tube blank, often warm spiral forming, double-sided submerged arc welding or high-frequency welding, which is used for foundation pile steel pipe of civil construction structure, wharf, bridge, etc.