Steel Billet 3SP is one of the most widely used semi-finished steel products in the world. It is the essential raw material for manufacturing rebar, profiles, I-beams, channels, and many other steel products used in construction and infrastructure projects. Due to its excellent weldability, high ductility, and cost-effectiveness, 3SP billet is considered the backbone of the steel construction industry.
If you are searching for a reliable billet supplier or want to learn more about the price, production, and applications of 3SP billets, this guide provides a complete overview.
Steel Billet 3SP is a semi-finished product with a square or round cross-section, produced through continuous casting.
Shape: Square (100×100, 120×120, 150×150 mm) or round
Standard: GOST 380-2005 (widely accepted in CIS, Middle East, Europe, and Asia)
Category: Low-carbon steel with high weldability and good formability
This grade of billet is specifically designed for producing long steel products that require both strength and flexibility.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.14 – 0.22 |
| Manganese (Mn) | 0.40 – 0.65 |
| Silicon (Si) | ≤ 0.3 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.04 |
This balanced composition provides a combination of strength, ductility, and cost efficiency, making 3SP billets ideal for mass construction projects.
Tensile Strength: 370 – 500 MPa
Yield Strength: 240 – 260 MPa
Elongation: 25 – 32%
These properties guarantee that billets can be easily rolled, welded, and shaped into the final products required in infrastructure and construction.
Raw Materials: Iron ore or scrap steel
Iron Making: Either Blast Furnace (BF) or Direct Reduction Iron (DRI) methods
Steelmaking: Electric Arc Furnace (EAF) or Basic Oxygen Furnace (BOF)
Refining: Ladle Furnace (LF) to adjust chemical composition
Continuous Casting: Molten steel solidifies into billets
Cutting & Cooling: Billets cut into standard lengths (6 – 12 m)
Storage & Delivery: Quality-checked billets sent to rolling mills
Steel Billet 3SP is a versatile material used across industries, especially in construction:
Reinforcement Bars (Rebar): Most common use of 3SP billet
I-Beams and H-Beams: For structural frameworks
Channels and Angles: For industrial and commercial projects
Square and Rectangular Profiles: Used in furniture, light construction, and mechanical applications
Welded Structures: Thanks to its excellent weldability
The demand for 3SP steel billets is rising due to large-scale construction and infrastructure projects. Major consumers include:
Turkey, UAE, Saudi Arabia, Iraq – Strong demand for rebar and profiles
China, India, Pakistan – Large infrastructure development programs
Europe (Italy, Spain, Eastern Europe) – Imports billets for rolling mills
North Africa (Egypt, Algeria) – Expanding construction and housing sectors
As global urbanization continues, the demand for high-quality billets is expected to grow significantly.
In steel billet classification, the letters SP stand for “Steel for Profiles” under the Russian GOST standard. This means that billets labeled as 3SP or 5SP are intended for producing rolled profiles such as rebars, beams, channels, and angles. The number before SP (3 or 5) indicates the steel grade, mainly reflecting the carbon content and mechanical properties.
| Feature | Steel Billet 3SP | Steel Billet 5SP |
|---|---|---|
| Carbon Content | Lower (0.14–0.22%) | Higher (up to ~0.28%) |
| Weldability | Excellent | Moderate |
| Ductility | High (better for bending and rolling) | Lower (more rigid) |
| Strength | Medium | Higher |
| Applications | Construction rebar, light and medium profiles, welded structures | Heavy profiles, industrial parts requiring more strength |
| Market Demand | Very high (construction industry) | Smaller but essential for heavy-duty projects |
Summary:
3SP Billet is more flexible, easier to weld, and widely used in construction. 5SP Billet is stronger, harder, and used for heavy-duty industrial applications.
Excellent weldability
High ductility and formability
Cost-effective compared to alloyed billets
Suitable for large-volume construction projects
Available in multiple sizes and lengths
Steel Billet 3SP is the foundation of the modern construction industry. With its balanced chemical composition, mechanical strength, and affordable price, it remains the preferred choice for manufacturers and construction companies worldwide.
If you are looking for a trusted billet supplier, ensure that the billets meet the GOST 380-2005 standards and come with full mill certification for guaranteed quality.
3SP billets have lower carbon content, offering better weldability and ductility, making them ideal for construction. 5SP billets contain higher carbon, which increases strength but reduces flexibility.
3SP billets are primarily used for producing rebar, I-beams, channels, profiles, and welded structures.
It is produced through steelmaking in furnaces (EAF or BOF), refined in ladle furnaces, and cast continuously into square or round shapes.
Standard sizes are 100×100 mm, 120×120 mm, and 150×150 mm with lengths between 6 – 12 meters.
The construction industry is the largest consumer, followed by infrastructure, manufacturing of profiles, and general engineering sectors.
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