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天津市北辰区中关村可信产业园B9-1 Address: B9-1, Trustworthy Industrial Park, Zhongguancun, Beichen District, Tianjin

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Analysis of the corresponding standard classification of seamless steel tubes




High-temperature and high-pressure medium transport, using reinforced rolled seamless steel pipe EN1233-1995, mainly used for transporting oil and gas, urban heating pipelines; high-frequency and high-pressure medium transport frequency-increased rolled seamless steel pipe EN1231-1995, using frequency-increasing mixed double-welding method Welded, frequency-increased coiled seamless steel pipe for high temperature and high pressure medium transportation.

Steel pipes have high temperature and high pressure capability, good plasticity, and are convenient for welding and processing. Generally, the transport of low-pressure medium is performed by using reinforced coiled seamless steel pipe EN1230-1995, which is made of acetylene gas maintenance welding or general surfacing welding for water, Gas, air and steam and other commonly used low-pressure medium transportation overlay welding steel pipes.

At that time, the common specifications of seamless steel pipes on the market were usually divided into: EN / B1230-1999 (Ministry standard, also known as reinforced rolled seamless steel pipes for general media transportation pipelines), WN / T9711.1-2008 (national standard, Also known as oil and gas city heating industry transportation steel pipe) delivery skills and conditions are at the top of the list: first grade steel pipe (when the demand is severe, there are WN / T8561.3-1998 secondary steel pipe)), BEP-5L Pipe steel pipe; there are two grades of ENM1 and ENM2), EN / B1217-1999 (seamless welded steel pipe for piles).

In general, the frequency-increased coiled seamless steel pipe (EN1213-1999) for the transportation of low-pressure media is made of hot-rolled steel strip as a pipe blank, which is often seamlessly formed. The frequency-increased mixed double welding method is used for welding under low pressure. Frequency-increased coiled seamless steel pipe for medium transportation. Seamless welded steel pipe for piles (EN1217-1999) is made of hot-rolled steel strip coil as a pipe blank, and is often seamlessly formed at the temperature. It is made of acetylene gas maintenance welding or frequency-increasing welding. It is used in civil construction structures, wharfs, Steel pipes for foundation piles such as bridges.




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