GB/T14164-2013 5L PSL1 L485(X70) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L450(X65) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L415(X60) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L390(X56) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L360(X52) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L320(X46) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L290(X42) Pipeline Steel Coil GB/T14164-2013 5L PSL1 L245(GRADE B) Pipeline Steel Coil