①,Material a、Faricated from alloy steel and shall conform in all respects to ASTM F912 b、Faricated from corrosion-resistant steel and shall conform in all respects to ASTM F880 |
①,Material a、Faricated from alloy steel and shall conform in all respects to ASTM F912 b、Faricated from corrosion-resistant steel and shall conform in all respects to ASTM F880 |