22年来，泫氏人一直致力于铸铁排水事业的研究与发展。

In 1994,  SUNS was found on 7th Jan.

In 1996,  SUNS was the first manufacturer in China who successfully adopted centrifugal casting technique to produce cast iron drainage pipes.

In 1997,  SUNS received the first order of 333.7t from South Korea and so began his journey around the world

In 1999,  SUNS’ production and sales ranked No.1 in China for the first time.

In 2002,  SUNS was the first enterprise who employed horizontal molding line to produce cast iron fittings.

In 2006,  as bidder of Bird Nest and Water Cube, SUNS finally became the designated supplier for 2008 Olympic Games.

In 2011,  SUNS self-developed Nine-station centrifuge and built the plant with capacity of producing 80000 tons of pipes per year

In 2013,  SUNS adopted advanced DISA molding technique(vertical) and built a pipe-fitting plant with large-scale of 40,000tons equipped with advanced machines

In 2015,  based on the first professional drainage testing-tower in China, National technical center for building drainage piping systems was established in SUNS. SUNS starts a new journey of transforming towards a production service-oriented enterprise.