ASTM A283/Q195 Carbon Steel Coil: Cost-Effective Structural Steel for General Fabrication
A283/Q195 Carbon Steel Coil Product Overview
ASTM A283/Q195 carbon steel coil is a low-to-medium tensile strength structural steel available in Grades A, B, C, and D, compliant with ASTM A283, GB/T 700 Q195, and EN 10025-2 S235JR standards. With 165–230 MPa yield strength and 27–30% elongation, this steel excels in welded structures, storage tanks, and lightweight building frameworks. Its 0.14–0.27% carbon content ensures easy machining and arc/MIG weldability, making it 25% more cost-efficient than high-strength alloys like A572.
Key Technical Specifications
1. Production & Dimensions
- Process:
- Hot-rolled: 2.75–100mm thickness (±1.2% tolerance)
- Cold-rolled: 0.2–3mm thickness (±0.4% tolerance)
- Width: 45–2,200mm (slit-to-width for laser/plasma cutting)
- Surface: Mill scale (Ra 10µm), wire-drawn (Ra 2.5µm), or laminated film (anti-rust)
2. Chemical Composition
| Grade | C (≤) | Mn (≤) | P (≤) | S (≤) | Si | Cu (≥) |
|---|---|---|---|---|---|---|
| A | 0.14% | 0.90% | 0.035% | 0.04% | 0.15–0.40% | 0.20% |
| B | 0.17% | 0.90% | 0.035% | 0.04% | 0.15–0.40% | 0.20% |
| C | 0.24% | 0.90% | 0.035% | 0.04% | 0.15–0.40% | 0.20% |
| D | 0.27% | 0.90% | 0.035% | 0.04% | 0.15–0.40% | 0.20% |
Trace elements: Cr ≤0.15%, Ni ≤0.20%
Mechanical Properties
| Grade | Yield Strength | Tensile Strength | Elongation (50mm) | Hardness (HB) |
|---|---|---|---|---|
| A | 165 MPa | 310–415 MPa | 30% | 120–150 |
| B | 185 MPa | 345–450 MPa | 28% | 130–160 |
| C | 205 MPa | 380–515 MPa | 25% | 140–175 |
| D | 230 MPa | 415–550 MPa | 23% | 150–190 |
Tested per ASTM A370 (transverse specimens)
Performance Advantages
- Formability & Machining:
- Bend radius: 1× thickness (ASTM A6/A6M) for press brake forming.
- Machinability rating: 70% (vs. 100% for 1212 steel).
- Weldability:
- Carbon Equivalent (CEV): 0.29–0.34 (IIW formula) for crack-free welding.
- Preheating: Not required below 25mm thickness (AWS D1.1 compliant).
- Corrosion Resistance:
- Atmospheric corrosion rate: 0.085 mm/year (ISO 9223 C2 environments).
- Compatible with galvanizing (610g/m²) or epoxy primers (50µm DFT).
- Thermal Conductivity:
- 46 W/m·K at 20°C (ideal for heat exchanger baffles).
Applications by Grade
| Grade | Industry | Use Case |
|---|---|---|
| A | Construction | Prefab building frames, roof trusses |
| B | Agriculture | Grain silos, irrigation pipes |
| C | Transport | Trailer chassis, railway platforms |
| D | Energy | Solar panel mounts, substation enclosures |
Global Equivalents
| ASTM A283 | EN 10025 | JIS G3101 | GB/T 700 |
|---|---|---|---|
| Grade A | S235JR | SS330 | Q195 |
| Grade D | S275JR | SS400 | Q235B |
Sustainability & Compliance
- Recycled Content: 91% (mill-certified)
- RoHS Compliance: Lead <0.01%, Mercury-free
- CE Marking: EN 1090-1 (Execution Class 1)
Packing And Delivery
