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gear steel bar is a kind of structural alloy steel bar under the standard GB/T 3077-1988. steel alloy carburizing steel is commonly used and it has high strength,toughness and good hardenability. can also be used in not carburizing and using the qualitative case and it is generally used for important parts with larger cross section, high load and good toughness and low notch sensitivity.
Chemical composition %:
|
Grade |
Chemical composition %: |
||||||||
|
C |
Si |
Mn |
S |
P |
Cr |
Ni |
Cu |
W |
|
|
0.13-0.19 |
0.17-0.37 |
0.30-0.60 |
≤0.025 |
≤0.025 |
1.35-1.65 |
4.0-4.5 |
≤0.025 |
0.80-1.20 |
|
mechanical properties:
|
Grade |
Mechanical properties: |
||||||
|
Tensile strength σb |
Yield strength σs |
Elongation δ5/（%） |
Percentage reduction of areaψ (%) |
Impact AKv(J)
|
Notched bar impact strengthαkv (J/cm²)
|
Hardness |
|
|
min |
min |
min |
min |
min |
min |
max |
|
|
1175(120) |
1029(105) |
10 |
45 |
78 |
98(10) |
269 |
|
gear steel bar Notes:
1, specification: DIA 80-1200mm(forged round bar), 80-1200mm(square bar) Length 3-16 meters
2, heat treatment: Quenching,Annealing,Normalizing and Tempering.
3, tolerance: 0-+3mm(DIA), 0-+10mm(Length)
Our company, KUNFENG can produce all sizes of forged steel round bar, forged square bar, forged shafts and forged blocks.
