... straight shank twist hot upsetting, hot. 16mm diameter, round steel, heat about 3-5 seconds, can be extruded. B, annealed ... , stretching, rose type. 2, heat treatment All kinds of hardware tools, electric, hydraulic, pneumatic components, air distribution and other mechanical ... , Motorcar-components, etc. machine metals parts, the Quenching for surface, of inside bore or part or for the whole. for ...