Production Standard | Chemical Composition | Physical & Mechanical Properties
Steel box profile — is a hollow steel profile with a square or rectangular cross-section. Due to its high strength and neat shape, it is widely used in construction and mechanical engineering
Production Standard:
- GOST 8639-82 — square profiles
- GOST 8645-68 — rectangular profiles
Chemical Composition (%):
| Element | Composition, % |
|---|---|
| Carbon (C) | 0.14-0.22 |
| Manganese (Mn) | 0.40-0.65 |
| Silicon (Si) | 0.05-0.30 |
| Sulfur (S) | ≤ 0.040 |
| Phosphorus (P) | ≤ 0.040 |
| Iron (Fe) | ≤ 98% |
📌 Due to the low carbon content, its weldability is good.
Physical Properties:
| Property | Value |
|---|---|
| Density | 7850 kg/m 3 |
| Modulus of elasticity (E) | 200-210 GPa |
| Thermal conductivity | ~ 45-60 W/m*K |
| Linear thermal expansion | 12×10 -6 1/°C |
| Melting point | ~ 1450 °C |
| Electrical conductivity | High |
Mechanical Properties:
| Property | Indicator |
|---|---|
| Yield strength | ≥ 235 MPa |
| Tensile strength | 360-510 MPa |
| Elongation (A5) | ≥ 20-25% |
| Hardness | ~ 120-170 |
| Impact strength | Moderate |
📌 Due to its profile shape, its resistance to bending and torsion is high.
Application Areas | Advantages | Limitations | Terms of Sale
Application Areas:
-
Construction
- Metal frameworks (workshops, warehouses, office buildings)
- Columns, beams, frame elements
- Stairs, railings, fences and doors
-
Mechanical Engineering and Industry
- Equipment frameworks
- Conveyor systems
- Load-bearing parts of technological units
-
Furniture and Interior
- Metal furniture frameworks
- Shelves, tables, stands
- Decorative metal structures
-
Transport and Infrastructure
- Automobile trailers
- Billboard supports
- Bridge and crossing elements (auxiliary structures)
Advantages:
-
High Strength-to-Weight Ratio
- Provides high load-bearing capacity with less material
-
Bending and Torsion Resistance
- More durable compared to open profiles due to closed cross-section
-
Weldability and Ease of Assembly
- Easy to cut, weld, and assemble
-
Variety of Sizes and Shapes
- Wide selection of square and rectangular dimensions
-
Cost Efficiency
- Often cheaper compared to I-beams and channels
-
Aesthetic Appearance
- Gives a neat design in open structures
Limitations:
-
Corrosion Risk
- Paint or galvanization is required especially in open environments
-
Protection of Inner Surface is Difficult
- Risk of rusting from the inside due to being hollow
-
Risk of Deformation During Welding
- Thin-walled profiles can warp from heat
-
Sensitivity to High Point Loads
- Denting of walls is possible under local loads
-
Fire Resistance is Limited
- Strength decreases at high temperatures
Quick Comparison:
| Profile Type | Advantage | Limitation |
|---|---|---|
| Box profile | Torsion resistant, aesthetic | Internal corrosion risk |
| Angle | Simple and cheap | Weak torsion |
| Channel | Good bending resistance | Open cross-section |
| Round tube | Best torsion | Difficult connection |
Terms of Sale:
- Box profile price is determined by side dimensions and thickness. Prices are quoted per meter.
- Profile demand is passed as quantity (pieces), 1 profile length is 6 meters or 12 meters (depending on customer choice).
- Relevant documents are provided to the buyer upon request (contract, acceptance act, invoice, waybill, weight slip, cash receipt, laboratory test analysis, certificate, etc.)
