C18MnCr High-Strength Structural Steel Coils
Optimized for Welded Frameworks & Medium-Stress Applications
C18MnCr structural steel delivers balanced weldability and durability, ideal for construction frameworks, agricultural machinery, and transport equipment. With a carbon content of 0.18% and controlled alloy ratios14, it resists thermal distortion in environments ranging from -20°C to +180°C.
Technical Specifications
Chemical Composition (Max Wt%)
| Element | C | Si | Mn | P | S | Ni | Al | Cr | Cu | Mo | N | Nb | Nb+Ti+V |
|———|—|—|—-|—|—|—|—|—-|—-|—-|—|—|—–|———|
| Content | 0.18 | 0.45 | 1.50 | 0.035 | 0.030 | 0.02 | 0.02 | 0.30 | 0.20 | 0.08 | 0.30 | 0.03 | 0.05 |
Key Features:
- Ultra-Low Sulfur (0.030%): Minimizes porosity in arc welding joints12
- Manganese Boost (1.50%): Enhances impact toughness for dynamic loading4
- Niobium Micro-Alloying (0.03%): Refines grain structure for fatigue resistance16
Mechanical Properties
| Yield Strength | Tensile Strength | Elongation | Bend Test (Mandrel Diameter) |
|---|---|---|---|
| 295 MPa | 440–560 MPa | ≥23% | 2.5×t (t = material thickness) |
Performance Highlights:
- 560 MPa Tensile Strength: Exceeds S235JR grades by 15%24
- 23% Elongation: Supports tight-radius bending (1.5D–3D radii) without cracking2
- Z25 Certification: Available for through-thickness ductility in critical joints26
Applications
- Construction: Warehouse trusses, conveyor support frames, and safety guardrails.
- Agricultural Equipment: Combine harvester chassis, grain silo reinforcements.
- Transportation: Trailer undercarriages, crane boom extensions46.
Competitive Advantages
- Cost Efficiency: 10% lower alloy costs vs. S355-grade steels4
- Machinability: 150–180 HB hardness ensures smooth CNC milling and drilling.
- Surface Finish: Pre-galvanized (G30–G60) options for corrosion-prone environments6.
Certifications & Logistics
- Mandatory: EN 10204 3.1 mill certificates + CE marking2
- Optional: Charpy V-notch testing (-20°C), ultrasonic flaw detection6
- Delivery: Oiled or shot-blasted (Sa2.5) surfaces with VCI-coated edge protection46
Logical Connectors:
- Comparison: While S355 suits heavy loads, C18MnCr optimizes cost for medium-stress uses.
- Example: For instance, trailer manufacturers prioritize Z25-certified batches.
- Cause-Effect: Reduced phosphorus (0.035%) improves cold-forming performance.
Request material test reports or project-specific quotes now!
MOQ 10MT. Available in 1,200–2,500mm widths. Lead time: 14–21 days.
Packing And Delivery
