What about Swiss GF pipeline?

GF, called George Fisher in Chinese, was founded in 1802 and has a history of more than 200 years. It is the best pipe supplier in the world, such as Burj Dubai, the world's tallest building, the only seven-star hotel, Potts Hotel and so on. GF tubes are used in the Bird's Nest, Expo Axis and Shanghai Center in China, as long as you can make it famous. Of course, in addition to making pipes, they also make automobile products and processing machines.

You can go to their Chinese official website to see: piping.georgfischer.com.