ASTM A633 Carbon Steel Coil: High-Strength Low-Alloy Steel for Cryogenic & Structural Applications
Product Overview
ASTM A633 carbon steel coil is a high-strength low-alloy (HSLA) structural steel available in Grades A, C, D, and E, engineered for extreme low-temperature environments (-50°C to 510°C). With yield strengths up to 415 MPa and impact toughness exceeding 27J at -70°C, this steel meets rigorous standards like ASTM A633/A633M, ASME SA633, and EN 10025-4. Ideal for pressure vessels, bridges, and cryogenic storage, it combines weldability, corrosion resistance, and load-bearing durability.
Key Technical Specifications
1. Production & Dimensions
- Process: Hot-rolled (2.75–100mm thickness) / Cold-rolled (0.2–3mm thickness)
- Width: 45–2,200mm (custom slit-to-width for stamping/roll-forming)
- Length: Customized up to 12m (coil ID: 508mm/610mm)
- Surface: Mill finish, laminated film (anti-corrosion), or wire-drawn (Ra 1.6µm)
2. Chemical Composition
| Grade | C (≤) | Mn | P (≤) | S (≤) | Si | V/Nb (≤) |
|---|---|---|---|---|---|---|
| A | 0.18% | 1.00–1.35% | 0.035% | 0.04% | 0.15–0.50% | – |
| C | 0.20% | 0.15–0.50% | 0.035% | 0.04% | 0.15–0.50% | Nb: 0.01–0.05% |
| D | 0.20% | 0.70–1.35% | 0.035% | 0.04% | 0.15–0.50% | – |
| E | 0.22% | 1.15–1.50% | 0.035% | 0.04% | 0.15–0.50% | V: 0.04–0.11% |
Trace elements: Cu ≤0.35%, Cr ≤0.15%, Ni ≤0.25%
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Charpy V-Notch (≥27J) |
|---|---|---|---|---|
| A | 290 | 430–570 | 18 (50mm) | -50°C |
| C | 345 | 485–620 | 18 (50mm) | -70°C |
| D | 345 | 485–620 | 18 (50mm) | -70°C |
| E | 415 | 550–690 | 18 (50mm) | -70°C |
Tested per ASTM A370/A673 (longitudinal specimens)
Performance Advantages
- Cryogenic Toughness:
- Grade E retains 40J impact energy at -100°C, outperforming ASTM A516 Grade 70 in LNG storage.
- Low ductile-to-brittle transition temperature (DBTT): -90°C (Grade C/D).
- Weldability:
- Carbon equivalent (CEV): 0.42–0.47 (IIW formula) for crack-free welding.
- Preheating: Not required below 19mm thickness (AWS D1.1 compliant).
- Corrosion Resistance:
- Atmospheric corrosion rate: 0.025mm/year (vs. 0.075mm/year for mild steel).
- Compatible with epoxy, zinc-rich, or thermal spray coatings.
- Thermal Stability:
- Thermal conductivity: 45 W/m·K (20°C)
- Coefficient of expansion: 11.7 µm/m°C (20–100°C)
Applications by Grade
| Grade | Industry | Use Case |
|---|---|---|
| A | Construction | Bridge girders, crane rails |
| C | Energy | Wind turbine towers, substations |
| D | Oil & Gas | Offshore platforms, pipeline valves |
| E | Cryogenics | LNG tanks, liquid nitrogen containers |
Global Equivalents
| ASTM A633 | EN | JIS | GB/T |
|---|---|---|---|
| Grade A | S355J2 | SM570 | Q345D |
| Grade E | S460N | SHY685 | Q415E |
Sustainability & Compliance
- Recycled Content: 88% (mill-certified)
- RoHS/REACH: Lead <0.01%, Hexavalent Chromium-free
- PED 2014/68/EU: Compliant for pressure equipment
Packing And Delivery
