阀杆经调质及表面氮化处理，有良好的抗腐蚀性及抗擦伤性。
The surface and the adjusting media of the valve shaft are nitrogenized so that it is erosion and abrasion resistant.
螺杆料筒采用优质合金钢，表面氮化处理，耐热、耐磨、耐腐蚀。
Screw bat of feed hopper abopted with alloysteel, special handing on surface, durabie in heat, wear and corrosion.
螺杆、机筒材料采用38crmoala，表面氮化处理，采用专用螺杆结构。
Screw and barrel materials used 38crmoala, nitrogen treatment, with special screw structure.
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