China AISI SAE ASTM 3140 5115 3120 3415 3435 3310 3312 3316 4320 9840 8615 8617 8620 8717 8640 8740 Alloy Steel Rod Bar, Find details about China Steel Bar, Round Steel from AISI SAE ASTM 3140 5115 3120 3415 3435 3310 3312 3316 4320 9840 8615 8617 8620 8717 8640 8740 Alloy Steel Rod Bar