China 9CR2mov
Standard GB / T 1299-1985 Characteristics and application of steel measuring and cutting tools, performance and Cr2 quite often for the manufacture of cold-working die, stamping die punch and die, pressure die and so on. (1) high hardness and high wear resistance. In order to ensure long-term use will not be soon wear, and lose their accuracy. (2) high dimensional stability. To ensure that the process of measuring the use and storage to maintain its shape and size of the constant. (3) adequate toughness. To ensure that when not in use for measuring causal factors - collision damage. (4) in exceptional circumstances with anti-corrosive. Chemical composition of carbon C: 0.80 ~ 0.95 Si Si: ≤ 0.40 Mn Mn: ≤ 0.40 Sulfur S: ≤ 0.030 P P: ≤ 0.030 Chromium Cr: 1.30 ~ 1.70 Ni: to allow the residual content of ≤ 0.25 Copper Cu: to allow the residual content of ≤ 0.30 mechanical properties of hardness: annealing, 217 ~ 179HB, indentation diameter of 4.1 ~ 4.5mm; quenching, ≥ 62HRC microstructure heat Treatment heat treatment specifications and standards: the sample quenching 820 ~ 850 ℃, oil cooling the steel in the annealed condition the delivery status of delivery .