- Categories:About Us
- Time of issue:2020-09-02 00:00:00
? 2001 Liaocheng Huazheng was established for frist producing line
? 2011 Liaocheng Tongyun was established for API &Alloy pipes producing.
? 2012 Cold drawn and Rebar couplers producing lines were ready for working
? 2013 Tongyun pipe got ISO certificate
? 2014 Tongyun pipe start to produce self drilling anchor bars
? 2015 Tongyun pipe South American branch company (Ecuador) was established
? 2020 Tongyun pipe got API Q1 , API 5CT, API 5L certificates .
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