1.Carbon steel casting 2.DIN, ASTM, BS,ISO standards 3.Surface:Rust prevention 4.OEM&ODM are provid 1. Material: Carbon steel, stainless steel , alloy steel according to ASTM, DIN,JIS, EN, ISO, GB standards2. Process: Casting(investment casting)+ Machining(if necessary)+Assembly+Surface treatment 3.inspection : chemical composition(spectrometer) ,machanical property, metallurgical structure, ...