... , varnishing, bromzing. Passivating, grinding, polishing6. Analysis wet chemically or by x-ray spectrometer. 3-coorcdinate. Computerised numerical. Control measuring ,machining ,pressure inspection ... . ,yield stress ,notched bar impact tenacity, x-ray,metallograph.7. Quality control: According to ISO 9001 2001 Marine Angle Fairleads With Two Wheels