... grade2, barrel, screw A, screw form:gh production of special screwsB, screw diameter:¢ 90mm, screw L/D:20:1, screw materials and ... processing technology:CMnALA,nitrided quenched Nitriding depth: ≥ 0.6 mm nitride hardness ≥ HV800 D ... appliances: Chint C, temperature-controlled table: Japanese Omron D, 18.5KW Motor: Siemens E, frequency: AMBF, ...