... & Tempered Steel, Cast Iron, Aluminum,Copper,Brass and so on.2. Heat Treatment: Hardening and Tempering,High Frequency Quenching, ... Carburizing Quenching and so on. 3. Inspection: All items are checked and tested ... with reasonable price, timely delivery and great customer service. A Professional on Drawing analysis, Meeting discussing, program auditing, PC & QC ...