24 July 2021 Gear Steel Bar
18CrMnBH Gear Steel Bar
18CrMnMoB belongs to the gear steel, is a lower chromium content, but also does not contain nickel forgings steel, good hardenability, strength and stability of large cross-section, better forging, welding and cutting process performance, high temperature Performance is better.
Chemical Composition of the 18CrMnMoB gear steel:
- Carbon C: 0.17-0.23,
- Silicon Si: 0.20-0.40,
- Manganese Mn: 1.20-1.50,
- Sulfur S: ≦ 0.030,
- Phosphorus P: ≦ 0.030,
- Chromium Cr: 1.50-1.80,
- Molybdenum Mo: 0.45 ~ 0.55,
- Boron B: 0.001 ~ 0.0035.
18CrMnMoB gear mechanical properties:
Tensile strength σb (MPa):
section size of 100 to 300, 883;
section size 300 ~ 500, 834;
section size 500 ~ 800, 785
Yield Strength σs (MPa):
585
Elongation:
5% at cross-sectional dimensions of 300-300 at cross-sectional dimensions of 300-300 at cross-sectional dimensions of 500-300: %): 40
Impact toughness value αkv (J / cm2): 49
Hardness:
269 to 302HB at a cross section of 300 to 500 and a cross section of 255 to 268HB at a cross section of 500 to 800 Cross sections of 241 to 286HB
18CrMnMoB Gear steel heat treatment specifications:
880 ℃ oil quenching, tempering 500 ~ 570 ℃.
18CrMnMoB gear steel for the manufacture of large working temperature below 450 ℃ high strength forgings, such as the wheel hub thickness of more than 300mm impeller, diameter greater than φ500mm spindle rotor and welding structure, etc .; can be used for casting.