Seamless Steel Pipe Manufacturer & Supplier — API 5L, ASTM A106, ASTM A53

Hot-rolled seamless carbon steel pipe, OD 5–16 in, WT 0.25–100 mm, grades 42CrMo/30CrMo/Q235/Q355. ASTM A106, A53, Schedule 40. ISO 9001 mill.

• Standards & grades: Seamless pipe is manufactured to GB and ASTM specifications. The most frequently specified standards for this range are ASTM A106 Gr.B (seamless carbon steel pipe for high-temperature service), ASTM A53 (Schedule 40, welded or seamless general-service pipe), ASTM A178 (electric-resistance-welded boiler tubes), ASTM A333 (low-temperature seamless and welded pipe) and ASTM A335 (seamless ferritic alloy-steel pipe for high-temperature service). For line-pipe applications, seamless pipe can also be supplied to API 5L PSL1/PSL2 (Grades B through X60). All production is managed under the ISO 9001 quality system (certificate No. 31325Q300277R0S, valid to 2028-05-12).
• As a seamless steel pipe manufacturer based in Tianjin, China, Sino East (brand SINO EAST) supplies hot-rolled seamless carbon steel pipe for pipeline fluid transport, high-temperature service and mechanical structures. Our seamless line covers outer diameters of 5–16 inches (approximately 127–406 mm) with wall thickness from 0.25 mm to 100 mm or fully customized, in steel grades 42CrMo, 30CrMo, Q235 and Q355, plus Gr.B on our ASTM A106/A53 product lines. Pipes are produced to GB and ASTM standards — including ASTM A53 Schedule 40, A106, A178, A333 and A335 — with hot-rolled, black phosphated or galvanized surfaces in standard 6 m or 12 m lengths. Typical order terms: MOQ 100 tons, delivery 15–45 days, invoiced by actual weight, with welding, punching, cutting, bending and decoiling available as processing services. Every shipment includes a Mill Test Certificate and is produced under ISO 9001 (certificate No. 31325Q300277R0S). With 16 years of export experience, Sino East is a reliable seamless steel pipe manufacturer and carbon steel pipe exporter for oil & gas, water and construction projects worldwide.