Carbon steel remains the most widely used material for industrial rivets, accounting for 80-90% of global fastener production. For Southeast Asian sellers looking to sell on Alibaba.com, understanding the nuances of carbon steel composition is essential for matching buyer requirements and avoiding costly specification mismatches.
The carbon content directly determines the material's mechanical properties. Low carbon steel (often called mild steel) contains less than 0.30% carbon, making it soft, ductile, and easy to form into rivet shapes. This is the most common choice for general-purpose rivets where extreme strength isn't required but good formability is essential.
Medium carbon steel (0.30-0.60% carbon) offers a balance between hardness and workability. These grades are often heat-treated to achieve specific mechanical properties and are suitable for automotive and structural applications where higher strength is needed. High carbon steel (above 0.60% carbon) provides maximum hardness but reduced ductility, making it less suitable for rivet manufacturing where the material must deform during installation.
Carbon Steel Grade Classifications for Rivet Applications
| Grade Type | Carbon Content | Tensile Strength | Key Characteristics | Typical Applications | Cost Position |
|---|---|---|---|---|---|
| Low Carbon (Mild Steel) | < 0.30% | 50-70 ksi (345-480 MPa) | Soft, ductile, easy to form, weldable | General purpose rivets, sheet metal work, light structural | Lowest cost |
| Medium Carbon | 0.30-0.60% | 70-100 ksi (480-690 MPa) | Balanced hardness and workability, heat treatable | Automotive components, machinery, medium-duty structural | Moderate cost |
| High Carbon |
| 100-150 ksi (690-1030 MPa) | Very hard, brittle, limited formability | Specialty applications, rarely used for rivets | Higher cost due to processing |
| Grade 2 (ASTM) | 0.13-0.25% | 55-72 ksi | Standard commercial quality, good ductility | General purpose structural rivets | Most economical |
| Grade 3 (ASTM) | 0.19-0.30% + Mn | 76-93 ksi | Higher strength, weathering resistant | Bridge construction, outdoor structures | Premium within carbon steel |
ASTM A502 provides the definitive specification for structural steel rivets used in construction and heavy industry. Grade 1 represents standard carbon steel suitable for general applications. Grade 2 is a carbon-manganese steel offering higher strength for demanding structural connections. Grade 3 is a weathering steel containing small amounts of nickel, chromium, and copper, which forms a protective oxide layer when exposed to atmosphere—ideal for bridges and outdoor structures where painting isn't practical.
Steel accounts for 80-90% of global fastener production by volume. Carbon steel fasteners are classified by grade (Grade 2, 5, 8) with tensile strengths ranging from 50 ksi to 150 ksi. The key advantage is cost-effectiveness, though corrosion resistance requires protective coatings like zinc plating or phosphating. [4]
For Southeast Asian manufacturers exporting through Alibaba.com, the ability to supply multiple grades within the carbon steel family provides flexibility to serve diverse buyer segments—from cost-conscious general hardware distributors to specification-driven construction contractors.

