各种规格平行双螺杆挤出机螺杆 机筒

调制硬度：hb260-290（hardness of adjuster:hb260-290）
氮化硬度：hv800-1050(hardness of nitration:hv800-1050)
氮化层深度：0.4~0.1mm(depth of nitrationcase:0.4~0.1mm)
氮化脆度：≤一级(fragility of nitration:less than grade 1)
表面粗糙度：ra 0.4(roughness of the surface:ra 0.4)
螺杆直线度：0.015mm(linearity of the screw:0.015mm)
氮化后表面镀铬硬度：≥900hv(the surface hard chromium plating hardness after nitrogenation≥900hv)
镀铬层厚度：0.5~0.10mm(chromium-plating layer thickness:0.05-0.10mm)
双合金硬度：hrc56~65(hardness of double alloys:hrc56-65)
双合金深度：0.8~2.0mm(depth of double alloys:0.8~2.0mm)
材料工艺(materials and processes)
优质38crmoaia(quality 38crmoaia)
优质双相不锈钢(quality twin-phase stainless)
优质粉末冶金材料(quality stellite powder surface spray)
冷，热喷吐硬金属工艺(cold alloys hot alloys)
先进渗碳工艺( advanced nitriding)
耐腐蚀，耐磨双金属喷涂工艺( process of hot sprayed hard alloys)