... submachine gun loaded with 7.62mm handgun bullets on the 5, or 10 or 15 m target;• Impenetrable by ... matching, but slightly worse welding performance.• HXFD2 steel with high strength, certain plastic toughness, and good welding performance. Recommended ... HXFD2 steel with higher cost performance• HXFD2 steel recommended. high-quality,high-strength and price-competitive bullet-proof steel plate HXFD1