... , N30SH~N45SH, N28UH~N35UH, N28EH~N33EH. 2. Coating and Test:Different kinds of surface treatment are applied to ... . There are Zinc coating, Ni coating, NiCuNi coating, epoxy coating, electrophoresis coating, etc. And we test the coating effect by spray test, pressure test ... SteelIn 2004 Identified as the High-new Tech Enterprise by Shanxi Technology and Science Commission Our business strategy: ...