40B grade steel is a Chinese GB standard (GB/T 3077) alloy structural steel. 40B material density is 7.85 g/cm³.
GB 40B alloy steel is produced in hot rolled and forged alloy steel bars which are not more than 250mm of nominal diameter or thickness.
GB 3077 40B Chemical Composition
|
Grade |
Chemical Composition |
|
40B |
The Element (%) |
|
C |
Si |
Mn |
Cr |
Mo |
Ni |
W |
B |
Al |
Ti |
V |
|
0.37-0.44 |
0.17-0.37 |
0.60-0.90 |
- |
0.40-0.50 |
- |
- |
0.0005-0.0035 |
- |
- |
0.05-0.12 |
GB 3077 40B Mechanical Property
|
Grade |
Mechanical Property |
|
40B |
Yield Strength
Mpa |
Tensile Strength
Mpa |
Elongation
% |
Impact energy
J |
|
785 |
635 |
12 |
55 |
GB 3077 40B steel application
Grade 40B steel is usually used in quenched and tempered condition. This alloy can be used after normalizing to make important parts such as shafts, small shafts, balance levers, etc. 40B steel works under wear and friction conditions or under large impact loads. Rocker, connecting rod, bolt, nut, gear and various rollers. In addition, GB 3077 40B steel can also be used as a high-frequency surface hardening steel for parts requiring high surface hardness and wear resistance.
