● 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.