1.standard sizes: OD: 30-250mm wall thickness: 3-35mm length: 3-5.8m tolerance: H8 straighness: 0.5mm/1000mm steel grade: 20-45#, 16Mn, Q345, St52, St 37, etc. standard: DIN, GB, ASTM, API,etc. non-standard sizes: as cuetomer's request. 2.surface treatment: oil painting, galvanized, chromed, or as customer's requirments. 3.package: packed in bundle, with plastic caps, plastic bag, etc 4.delivery time: within 30 days generally 5.payment term: T/T, L/C( we prefer T/T)
