Product Name: metal to metal seat Coatings: STL6# Surfacing Surface Hardness: 45(HRC) Other Handling: Seattle Spraying，Spray Welding Specifications: NPS 1/2"~48"(DN15~1200) Pressure Rating: Class 150~600(PN16~100) Base Material: ASTM A105，A350 LF2，A182 F304，A182 F316，A182 F6A，A182 F51，A182F53，A564 630(17-4PH)、Monel Coatings: Tungsten Carbide、Chrome Carbide、Stellite、Inconel、Special