Q345 black annealed cold-rolled fully hardened steel coil is a high-quality steel made of low-alloy high-strength steel Q345 as the base material through precision cold rolling and special annealing process. The product maintains full hardness, with a uniform black oxide film on the surface (not pickled), and has both ultra-high strength and good processing adaptability. It is an ideal choice for construction, machinery, transportation and other fields.
Q345 Full hard Cold Rolled Steel Coils Black Annealed Technical Parameters:
|
Item |
parameter |
|
Material Standard |
GB/T 1591-2018 Q345B |
|
Tensile Strength |
650-800 MPa |
|
Yield Strength |
≥345 MPa |
|
Elongation |
8-15% |
|
Hardness |
HRB 85-100 |
|
Thickness Range |
0.8-6.0mm(Regular stock) |
|
Roll Weight |
5-15吨/卷(Can be cut) |
Q345 Full Hard CRBA Coil Advantages:
✅ Ultra-high strength performance
Tensile strength: 650-800MPa, far exceeding ordinary low-carbon steel
Yield strength: ≥345MPa (in line with national standard Q345)
Stable hardness: HRB 85-100, wear-resistant and pressure-resistant
✅ Precision dimensional control
Thickness tolerance: ±0.05mm (≤3mm)
Width range: 800-1800mm (customizable slitting)
✅ Excellent surface quality
Surface roughness: Ra 1.2-2.5μm, flat and uniform
Black oxide film: no need for pickling, can be directly processed or sprayed
✅ Economical and efficient
Compared with galvanized sheet of the same strength, the cost is reduced by 20-30%
Suitable for high-strength structural parts alternative
Q345 Black Annealed Cold Rolled Coil Full Hard Typical applications:
🔹 Heavy construction:
High-rise steel structure beams and columns
Long-span bridge supports
Heavy-duty factory frame
🔹 Construction machinery:
Excavator arm lining
Crane track substrate
Mining machinery wear-resistant parts
🔹 Transportation:
Truck chassis reinforcement
Container side panel frame
Special vehicle anti-collision structure
🔹 Energy equipment:
Wind power tower connector
Oil pipeline support frame
Our packaging and logistics
Standard packaging:
Steel strapping + anti-rust paper + VCI gas phase anti-rust film
PE protective cover added to the core
Special packaging:
Export-grade waterproof packaging (extra charge)
Rolling service (minimum slitting width 200mm)
Logistics guarantee:
Domestic land transportation/sea transportation door to door
One-stop export customs declaration service
about Us
GNEE Group strictly follows domestic and international trade practices, regards reputation as life, and provides all customers with the best quality products and the most complete services. The company has established a complete service system and technical support system, not only providing customers with the best quality products, but also providing complete after-sales service.
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