1.Stainless Boiler Steel Pipes 2.Size: 18-426*2-10*Length ... , 316, 316L, 310 4.Standard: ASTM A269 1. Stainless Boiler Steel Pipes 2. Size: 18-426*2-10*Length3. Grade ... . The products are widely used in fertilizer, petroleum, central-station, boiler, power station, shipping military, chemical industry, environment protection, traffic, ... %≥35%≥35%Hardness (HV)<253<253<200<200 Stainless Boiler Steel Pipes