Drill String Cross-over Sub uses AISI4145H chromium-molybdenum steel, execute API specification.We can produce the same-dia type, reducers type and L-type three types, the screw can be cold thread rolling, copper or phosphate treatment.
A204 GR.B is under ASTM standard and A204 GR.B steel is a Cr-Mo alloy steel which is particularly designed for boilers and pressure vessels. KUNFENG can offer A204 GR.B steel in most competitive price with assured quality.
The steel for shipbuilding and oil platform---DH36, is the high tensile strength steel.The shipbuilding steel DH36 is the Hull structural steel.We can provide DH36 shipbuilding steel plate price.
DNV Grade A shipbuilding steel plate is a kind of hot rolled general tensile strength steel. DNV steels come 4 grades in ordinary-strength steel for shipbuilding and DNV Grade A shipbuilding steel plate is the lowest one of them.