Beijing Smart International Group, Co, Ltd is a special carbon steel pipes, seamless steel pipe manufacturer located in Hebei of China. It was founded in 1990, and has been serving in this field for over 15 years, by providing high quality products and after-service, it has gained much good honor from customers from all over the word. The major products produced by our company are divided into two categories: Carbon Seamless Steel Pipe and Welded Steel Pipe. Carbon Steel Seamless Steel Pipe 1. Seamless steel pipe for general use: ASTM A 53 GR. B. Steel Grade: SA53B and specication O. D: 1/2"- 28", 21.34 -711.2mm W. T: SCH10S- SCH160.2. Seamless steel pipe for high temperature: ASTM A 106 GR. B. Steel Grade: SA106B. Specication O. D: 1/2"-28", 21.34 -711.2mm W. T: SCH10S- SCH160.3. Line Pipe: API SPEC 5L. Steel Grade: A, B, X42, X46, X52 (PSL1)and specication O. D: 2"-28", 60.3- 7 11.2mm W. T: SCH10S-SCH160.4. Casing Pipe: API SPEC 5CT. Steel Grade: J. K. N. L. P(PSL1) Threads: STC, LC, BC and specication: 5"-13-3/8", 127-339.7mm. 5. Seamless steel pipe DIN2448/1629/2391, DIN17175. Steel Grade: St37, st42, st52, st35.8-st45.8/1, specication O. D: 1/8"-3", 10.3-88.9 mm W. T: 1-14mm. And other relevant standard: Seamless steel pipes for heat exchangers and condensers: ASTM A179. Seamless carbon steel pipes for high pressure boilers: ASTM A192. Seamless steel pipes for low& medium pressure boiler: GB3087-1999. Seamless steel tubes for structural purposes: GB8162-1999. Seamless steel tubes for liquid service: GB/T8163-1999. Seamless steel tubes for high pressure boiler: GB5310-1995.