GB/T14164-2013 5L PSL2 X60N (L415N) Pipeline Steel Coil GB/T14164-2013 5L PSL2 X52N (L360N) Pipeline Steel Coil GB/T14164-2013 5L PSL2 X46N (L320N) Pipeline Steel Coil GB/T14164-2013 5L PSL2 X42N (L290N) Pipeline Steel Coil GB/T14164-2013 5L PSL2 Grade BN (L245N) Pipeline Steel Coil GB/T14164-2013 5L PSL2 X56N (L390N) Pipeline Steel Coil