1.Application: Marine and locomotive turbocharger parts, aviation turbojet engine spare parts, gas turbine parts, aero engine turbine parts... 2.Stainless steel alloy: 301, 304, 304l, 309, 309s, 316, 316l... Heat resistent alloy: k418, k465, in718, in738c, in738lc... Casting surface: 1.6-3.2um. 3.Company brief introduction: 3.1 ten years of experience in the nozzle ring casting field. 3.2 make shell by using pure silica sol, american wax , australian zircon powder and sand. 3.3 strict control of every produce step, from material prepare to finished product quality test.