GB/T1591 Q345B H/I Beam/ channel steel is steel with less than 0.2 percent of its composition made up of carbon, less than 0.55 percent of its composition made of silicon and several impurities (mostly sulfur, chromium and nickel).
CK60 steel is a kind of hypoeutectoid steel, strength, hardness and flexibility are very high, plasticity is low when in the cold deformation, poor machinability, welding and hardenability.
Comparing with steel sheet ASTM A514 Grade Q and sheet A514 Grade R, for the chemical composition,steel sheet ASTM A514 Grade Q contains Chromium 1.00-1.50 %,and steel plates ASTM A514 Grade R just contains 0.35-0.65%.
ASTM A671 CA55 LSAW steel pipeline,under ASTM specification.ASTM A671 CA55 LSAW steel pipeline used for conveyance of oil, petrifaction, natural gas, town gas, water and coal slurry, also applied in construction, bridge, power engineering, etc.