1. Seamless steel pipe for general use: astm a 53 gr. B, Steel grade: sa53b and specication 2"-28", 60.3-711.2mm 2. Seamless steel pipe for high temperature:astm a 106 gr. B, Steel grade: sa106b and specication 2"-28", 60.3-711.2mm 3. Pipeline: api spec 5l. 5ct Steel grade: b, x42, x46, x52 and specification 2"-28", 60.3-711.2mm 4. Seamless steel pipe for low temperature of -40íp-101íp, astm a333, Steel grade: gr. A, gr.1, gr.7, gr.3 specication 2"-28", 60.3-711.2mm 5. Seamless steel pipe din2448/1629, din17175-1979, german standard, Steel grade: st37, st42, st52, st35.8-st45.8/1, specication 2"-28", 60.3-711.2mm;