10# seamless steel pipe mechanical properties:Tensile strength σb (MPa): ≥410 (42) Yield strength σs (MPa): ≥245 (25) elongation δ5 (%): ≥25 shrinkage rate ψ (%): ≥5, hardness: unheated ,≤156HB, sample size: sample size 25mm　　10# Seamless steel pipe instructions　　 Used in various fields such as auto