IS 1239 H (Heavy) Pipe
Heavy-Duty Mild Steel Pipes for High-Pressure and Structural Engineering
IS 1239 H (Heavy) is the most robust series in the mild steel piping range, featuring the thickest walls for maximum strength and pressure-bearing capacity. Often referred to as "Class C" or "Red Band" pipes, they are engineered to withstand rigorous industrial conditions. Whether used for high-pressure steam and gas lines or as heavy-duty structural columns, these pipes offer the highest level of durability and long-term reliability in the IS 1239 category.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | IS 1239 (Part 1) : 2004 |
| Grade / Series | Heavy (Class C / Red Band) |
| Nominal Bore (NB) | 15mm to 150mm (1/2" to 6") |
| Manufacturing | ERW (Electric Resistance Welded) |
| Surface Finish | Black MS or Hot-Dipped Galvanized (GI) |
| Color Coding | Red Band (Identifies Heavy Grade) |
Mechanical Properties
| Property | IS 1239 Grade H Value |
|---|---|
| Tensile Strength (Min) | 320 MPa |
| Yield Strength (Min) | 210 MPa (YST 210) |
| Elongation (Min %) | 12% to 20% |
| Hydrostatic Pressure | Heavy wall allows for superior pressure handling over L and M grades |
Chemical Composition (%)
| Element | Percentage (Max) |
|---|---|
| Carbon (C) | 0.20% max |
| Manganese (Mn) | 1.30% max |
| Phosphorus (P) | 0.040% max |
| Sulphur (S) | 0.040% max |
Features and Benefits of IS 1239 Grade H Pipe
- Maximum wall thickness for superior resistance to high internal pressures
- Enhanced structural rigidity for heavy load-bearing applications
- Extended service life in harsh industrial and underground environments
- Exceptional weld strength capable of maintaining integrity under stress
- High resistance to mechanical damage and external impacts
- Optimized for high-pressure steam, oil, and chemical transport
- Available with heavy-duty galvanization for maximum corrosion protection
Applications & Uses
High-Pressure Lines
Primary choice for industrial gas, compressed air, and high-pressure water lines.
Heavy Structural
Applied in industrial sheds, structural columns, and large-scale transmission towers.
Boiler Accessories
Used in peripheral boiler piping where heavy wall thickness is a safety requirement.