Widely used in water projects, oil and natural gas industry, power industry, agricultural irrigation, urban construction, China's 1990s development of key products, one of 20.
Use products
Used for liquid delivery: oil, water supply, drainage.
For gas transportation used: natural gas, gas, steam.
A structure used: piling construction, engineering structure.
And the level of implementation of the standards:
American Petroleum Institute API SPEC 5L A.B. X42-X
52
People's Republic of China standards GB/T9711.1-1997 L210, L245, L290, L320, L360
China's Ministry of Oil standard SY/T5037-2000 Q195, Q215, Q235
Specifications:
Ф219-Ф1620, thickness 6-16 mm, length 6-12 metres, in accordance with user requirements size of production.