... A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY requirementsApplication: Widely used in ... A500,EN10210,GB/T9711.1-1997, API Material:Q195, Q215,Q235,Q345,ST37-2,ST52-3,S235,S355, 20#etc Diamete20*20 ...