1. Low-pressure fluid transportation with welded steel pipe (GB/T3092-1993) is also known as the general welded pipe, commonly known as black pipe. Is used to transport water, gas, air, oil and heating steam and other general lower pressure fluid and other purposes of the welded steel pipe. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe; the form of pipe end is divided into steel pipe without threads (light pipe) and steel pipe with threads. Steel pipe specifications with nominal caliber (mm) that the nominal caliber is an approximation of the inner diameter. Customarily used in inches, such as 11/2 and so on. Welded steel pipe for low-pressure fluid transport in addition to direct use for the transport of fluids, but also used in large quantities as a low-pressure fluid transport with galvanized welded steel pipe raw pipe.
2. Low-pressure fluid transport galvanized welded steel pipe (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white pipe. Is used to transport water, gas, air oil and heating steam, warm water and other general lower pressure fluid or other uses of hot dip galvanized welded (furnace welding or electric welding) steel pipe. The wall thickness of the steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the form of the receiver end is divided into galvanized steel pipe without threads and galvanized steel pipe with threads. Steel pipe specifications with nominal caliber (mm), nominal caliber is an approximation of the inner diameter. Customarily used in inches, such as 11/2 and so on.
3. Ordinary carbon steel wire casing (GB3640-88) is industrial and civil construction, installation of machinery and equipment, and other electrical installation projects for the protection of wires in the steel pipe.
4. Straight seam electric welded steel pipe (YB242-63) is the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welding steel pipe, electric welding thin-walled pipe, transformer cooling oil pipe and so on.
High-frequency straight seam steel pipe standard code:
1. Welded steel pipe for low-pressure fluid transportation (GB/T3092-1993) is also known as the general welded pipe, commonly known as black pipe. Is used to transport water, gas, air, oil and heating steam and other general lower pressure fluids and other uses of welded steel pipe. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe; the form of pipe end is divided into steel pipe without threads (light pipe) and steel pipe with threads. Steel pipe specifications with nominal caliber (mm) that the nominal caliber is an approximation of the inner diameter. Customarily used in inches, such as 11/2 and so on. Welded steel pipe for low-pressure fluid transport in addition to direct use for the transport of fluids, but also used in large quantities as a low-pressure fluid transport with galvanized welded steel pipe raw pipe.
2. Low-pressure fluid transport galvanized welded steel pipe (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white pipe. Is used to transport water, gas, air oil and heating steam, warm water and other general lower pressure fluid or other uses of hot dip galvanized welded (furnace welding or electric welding) steel pipe. The wall thickness of the steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the form of the receiver end is divided into galvanized steel pipe without threads and galvanized steel pipe with threads. Steel pipe specifications with nominal caliber (mm), nominal caliber is an approximation of the inner diameter. Customarily used in inches, such as 11/2 and so on.
3. Ordinary carbon steel wire casing (GB3640-88) is industrial and civil construction, installation of machinery and equipment, and other electrical installation projects for the protection of wires in the steel pipe.
4. Straight seam electric welded steel pipe (YB242-63) is the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe
And steel pipe is generally divided into two main categories, one is called welded steel pipe, the other is seamless steel pipe.
Welded steel pipe, also known as welded pipe, is made of steel plate or strip steel after roll forming and welding. Welded steel pipe production process is simple, high production efficiency, more varieties and specifications, less equipment, but the general strength is lower than the seamless steel pipe. since the 1930s, with the rapid development of high-quality strip steel rolling production and welding and inspection technology advances in the quality of the weld seam continues to improve, welded steel pipe varieties and specifications are increasing and in more and more areas instead of the seamless steel pipe. Welded steel pipe according to the form of weld seam is divided into straight seam welded pipe and spiral welded pipe.
Welded steel pipe billet is steel plate or strip steel, because of its welding process is divided into furnace welding pipe, electric welding (resistance welding) pipe and automatic arc welding pipe. Because of its welding form is divided into straight seam welded pipe and spiral welded pipe two kinds. Because of its end shape is divided into round welded pipe and shaped (square, flat, etc.) welded pipe. Welded pipe is divided into the following varieties because of its different materials and uses:
GB/T3091-1993 (low-pressure fluid transport galvanized welded steel pipe). Mainly used for the transportation of water, gas, air, oil and heating hot water or steam and other general lower pressure fluid and other purposes. Its representative material Q235A grade steel.
GB/T3092-1993 (galvanized welded steel pipe for low-pressure fluid transport). Mainly used for the transportation of water, gas, air, oil and heating hot water or steam and other general low-pressure fluids and other purposes. Its representative material: Q235A grade steel.
GB/T14291-1992 (welded steel pipe for fluid transportation in mines). Mainly used for mine pressure wind, drainage, shaft gas discharge with straight seam welded steel pipe. Its representative material Q235A, B-grade steel. GB/T14980-1994 (low-pressure fluid transportation with large diameter welded steel pipe). Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluids and other purposes. Its representative material Q235A grade steel.
GB/T12770-1991 (stainless steel welded steel pipe for mechanical structure). Mainly used for machinery, automobiles, bicycles, furniture, hotels and restaurants decoration and other mechanical parts and structural components. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
GB/T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used for conveying low pressure corrosive media. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 and so on.
Straight seam welded pipe production process is simple, high production efficiency, low cost, faster development. Spiral welded pipe strength is generally higher than straight seam welded pipe, can use a narrower billet to produce a larger diameter welded pipe, but also can use the same width of the billet to produce a different diameter welded pipe. However, compared with the same length of straight seam pipe, the length of the welded seam increases by 30-100%, and the production speed is lower.
Therefore, the smaller diameter welded pipe is mostly used straight seam welding, large diameter welded pipe is mostly spiral welding. (For example, the West-East gas pipeline is spiral welded pipe, Taiyuan Heavy Industry on the production of spiral welded pipe machine)
Currently there is a newer technology, called "hot reduction", that is, the welded pipe and then rolled a little bit, in order to improve the quality of its surface and dimensional tolerances, so that the overall performance is close to that of the seamless steel pipe.