Zhoushan Changjia Plastic machinery Co.,Ltd. Parallel Screw Barrel Tempering hardness：HB260-290 Nitridation hardness：HV800-1050 Nitration case depth：0.4-0.7mm Nitridation brittleness ≤ grade 1 Surface roughness：Ra0.4 Screw straightness：0.015mm Chromium coating hardness after nitridation：≥900HV Chromium coating thickness：0.05-0.10mm Dual alloy hardness：HRC56-65 Dual alloy depth：0.8-2.0mm Material and technology Quality38CrMoAIA Quality power metallurgy material Cold/hot spraying hard metal technology Advanced nitriding technology Corrosion resistance, wear-resisting dual alloy spraying technology Bottle Blowing Machine Barrel Machine Use：extruder、injection molding machine Material：38CrMoAl Processing range：Ф12mm - Ф300mm Screw effective length：12000mm Nitration case depth：0.4mm-0.7mm Nitridation hardness：950-1100HV Chromium coating thickness：0.02mm-0.20mm Surface roughness：Ra 0.4μm Screw straightness：0.015mm/m Contact us Add: No.1 Xitun Road, Xitun Industrial Zone, Jintang Town,Dinghai District, Zhoushan, Zhejiang, China Tel: +86 15957056012 Fax: +86 0576-85131178 Email: [email protected] Website: https://www.cjscrewbarrel.com