Henan zhongyuan Heavy Forging Co.,Ltd(HHF) is specialized in Research,Production,Sales and Services for MINING EQUIPMENT and Large Precision Forgings.HHF is the first factory in China that researched,developed,and batch-produced HIGH STRENGTH SAE 4330VMOD RASIE BORING DRILLRODS. The products like RAISE BORE DRILL RODS,RIB STABILIERS,DRILL STEMS,drillstabilizer,drill collar,non-magnetic drill stabilizer,non-magnetic drill collar,roller reamer,pump block and marine shaft,crusher shaft,gear shaft,pipe mould are widely welcomedby more than twenty countries and regions:United States,Canada,United Kingdom,France,Italy,Australia,Russia,Middle East,South Africa,Brazil and Singapore etc.