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Raiseboring 4330V MOD High Strength Drill Pipe
Henan Zhongyuan Heavy Forging Co.,Ltd (HHF) is a National Hi-Tech Enterprise which concludes four plants--Forging Plant, Heat Treatment Plant, Machining Plant, Petroleum Equipment Plant, one Provincial Engineering Technology Research Center for Drilling Tools Stabilizer, one laboratory, one Municipal Technology Research and Development Center. HHF has been certified by the following: API Q1 Quality Management System, License of Using Official API 7-1 Monogram, CSSC Quality System, ISO 9001:2008, ISO/TS29001 International Quality System.
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