● Features and application:
Appropriate increase in Si, Mn content in order to improve its hardenability and elastic limit, good wear resistance. Manufacture of rolling a large size range of application, mainly for the manufacture of wall thickness> 12mm, diameter> 280mm diameter steel ball bearing ring> 50mm; conical, cylindrical and spherical roller diameter> 22mm, and all sizes of needle.
● Chemical Composition:
Carbon C: 0.95 ~ 1.05
Si Si: 0.40 ~ 0.65
Manganese Mn: 0.90 ~ 1.20
Sulfur S: ≤ 0.020
Phosphorus P: ≤ 0.027
Chromium Cr: 1.30 ~ 1.65
Ni-Ni: ≤ 0.30
Copper Cu: ≤ 0.25
● Mechanical Properties:
Tensile strength σb (MPa): 1831
Impact energy Akv (J): 23
Hardness: 65HRC
Sample size: a sample
● Heat treatment and microstructure specifications:
Heat treatment specifications: 830 ~ 840 ℃ quenching oil cooling; 160 ℃ tempering 3h.
Microstructure: martensite.
