.Features: 1) Cold drawn cold-drawn or cold-rolled seamless tube 2) Seamless steel pipes for structural purposes 3) Seamless steel pipes for liquid service 4) Seamless steel pipes for hydraulic and pneumatic cylinder 5) Outer diameter: 20-250mm 6) Wall thickness: 0.5-20mm 7) Standards: GB/T3639-2000, GB/T8163-1999, GB/T8162-1999 , GB/T3094-2000 8) Symbol: 10, 20, 35, 45, 16Mn 9) Yield point (MPa): min. 10 10) Delivery length:2~7m, specified length also can be provided after consulting with customers 11) Types: a) 10 : C:0.07 - 0.13%, Si: 0.17 - 0.37%, Mn: 0.35 - 0.65%, P (max.): 0.035%, S (max.): 0.035% , Cr(max.): 0.15%, Ni(max.): 0.30%, Cu(max.): 0.25% b) 20 : C:0.17 - 0.23%, Si: 0.17 - 0.37%, Mn: 0.35 - 0.65%, P (max.): 0.035%, S (max.): 0.035% , Cr(max.): 0.25%, Ni(max.): 0.30%, Cu(max.): 0.25% c) 35 : C:0.32 - 0.39%, Si: 0.17-0.37%, Mn: 0.50 - 0.80%, P (max.): 0.035%, S (max.): 0.035% , Cr(max.): 0.25%, Ni(max.): 0.30%, Cu(max.): 0.25% d) 45 : C:0.42 - 0.50%, Si: 0.17-0.37%, Mn: 0.50 - 0.80%, P (max.): 0.035%, S (max.): 0.035% , Cr(max.): 0.25%, Ni(max.): 0.30%, Cu(max.): 0.25% e)16Mn: C:0.12% - 0.20%, Si: 0.20% - 0.60%, Mn: 1.20% - 1.60%, P (max.): 0.040%, S (max.): 0.040%, Cr(max.): 0.25%, Ni(max.): 0.30%, Cu(max.): 0.25%