NAK55( plastic mold steel)

1) The steel heat treatment, has the uniform stability (HB290 hardness through - 330) mould never deformation.

2) A fancy, except BaoChu has more surface oxidation black, high efficiency, material and reduce processing cost.

3) By ultrasound examination, hardness and uniform metallurgical structure and easy to achieve mirror polishing.

4) Method in air available flame hardening, make the part where hardened to 50 vulnerability 55HRC - 5mm about depth.

5) Because of low sulphur content to spark electrical erosion, more suitable