GB/T16270 Q960F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q960D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q960C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q960E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q890E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q890D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q890C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q890F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q800F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q800D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q800C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q800E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q690E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q690D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q690C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q690F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q620F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q620E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q620D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q620C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q550E Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q550C Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q550D Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q550F Carbon and Low-alloy High-strength Steel Coil GB/T16270 Q500F Carbon and Low-alloy High-strength Steel Coil