Description
GOST 5520 Carbon structural steel
GOST 5520 is a Russian standard for carbon structural steel used in various engineering and construction applications. This standard covers hot-rolled steel sections, plates, and bars with specified mechanical properties and chemical compositions to ensure strength, durability, and weldability.
Key Features
- High Strength & Toughness: Suitable for structural applications requiring robustness.
- Good Weldability: Can be welded using conventional techniques.
- Versatile Applications: Used in construction, machine building, and metal structures.
- Variety of Grades: Includes different carbon content levels for specific mechanical properties.
Common Grades Under GOST 5520
- St3 (Ст3)
- St5 (Ст5)
- St6 (Ст6)
St3 Chemical Composition
| Element |
Composition (%) |
| Carbon (C) |
0.14 – 0.22 |
| Silicon (Si) |
0.05 – 0.35 |
| Manganese (Mn) |
0.40 – 0.65 |
| Phosphorus (P) |
≤ 0.045 |
| Sulfur (S) |
≤ 0.050 |
St3 Mechanical Properties
| Property |
Value |
| Yield Strength |
≥ 235 MPa |
| Tensile Strength |
370 – 510 MPa |
| Elongation |
≥ 21% |
GOST 5520 Dimesions
- Outer Diameter (OD)
- Typically ranges from 10 mm to 1420 mm
- Wall Thickness (WT)
- Varies from 1.0 mm to 40 mm, depending on the pipe size and application.
- Length (L)
- Pipes are supplied in:
- Measured Length: 4,000 mm to 12,000 mm
- Unmeasured Length: Typically 4,000 mm to 9,000 mm
- Custom Lengths can be specified based on project requirements.
- Pipe Types
- Longitudinally Welded Pipes (LSAW)
- Spirally Welded Pipes (SSAW)
- Dimensional Tolerances
-
- Outer Diameter: ±1% (for pipes ≤ 200 mm) and ±0.75% (for pipes > 200 mm)
- Wall Thickness: ±12.5%
- Length Tolerance: ±15 mm for measured-length pipes
Applications
- Construction: Beams, columns, and structural frameworks.
- Machinery: Manufacturing of machine parts and frames.
- Bridges & Infrastructure: Used in bridges, railway tracks, and other load-bearing structures.
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