NINGBO XINGSHENG OIL PIPE FITTINGS MANUFACTURE CO.LTD. We mainly supply A193 B7 B7M B16 and A320 L7 L7M L43 thread rods and stud bolts.Our company is subsidiary of Ningbo Chenglong Special Steel Company which has 20 years history with 4 own factories and 2 special lab.We have more than 100 sets production equipment ,mainly are: various kinds of heat treatment equipment ,hot forge bolts product,multiple-cold forge equipment ,and threading machine. We also have more than 20 perfect sets of testing machine,mainly are:100 tons&60 tons tesile machine,charpy impact tester,material analysis instrument,crack detected machine,hardness tester,torque tester and so on.Our products have been passed ISO:9001-2008.Our company is developing international markets while developing the markets in China.We have good cooperative relationships with more than 20 foreign importers in different countries and regions now .Main markets:AISA,MIDDLE EAST,NORTH AMERICA,SOUTH AMERICA,EUROPE.