24 July 2021 Structural Steel Bar
SAE 5120 Structural Steel Bar
SAE5120 alloy structural steel, equivalent to China GB Standard Grade 20Cr, is mainly used for mechanical parts and various engineering components and contains one or several certain amount of alloying elements. SAE5120 alloy structural steel has suitable hardenability, after suitable metal heat treatment, the microstructure is uniform sorbite, bainite or very fine pearlite, so it has high tensile strength and yield strength. Ratio (usually around 0.85), higher toughness and fatigue strength, and lower toughness-brittle transition temperature, can be used to manufacture machine parts with larger cross-sectional dimensions.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) |
|---|---|---|---|---|---|
| 0.17～0.22 | 0.15 ~ 0.35 | 0.70 ~ 0.90 | ≤0.035 | ≤0.040 | 0.70～0.90 |
Mechanical Propoerties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Elongation δ5 (%): | Reduction of area ψ (%): | Impact energy Akv (J): | Impact toughness value αkv (J/cm2) | Hardness |
|---|---|---|---|---|---|---|
| ≥ 658(65) | ≥ 765(75) | ≥ 14.5 | ≥ 45 | ≥ 41 | ≥ 39(4) | ≥ 205 HB |