International Standard such as API, ASTM(ASME),DIN, GB, JIS etc. The size covers from 1/4 to 24 (OD from 13.7mm to 609.6mm), wall-thickness from SCH20 to ScCH160,XXS, and length up to 40- OCTG- Seamless Steel Pipes for Structure and Transport Purpose- Seamless Steel Pipes for Low and Medium Pressure Boiler- Seamless Steel Pipes for High Pressure Boiler- Seamless Steel Pipes for High-Temperature Service - Seamless Steel Pipes for Low-Temperature Service- Seamless Steel Pipes for Shipbuilding- Coating Pipes