Wuxi Jin Ming Jian De Industry & Trade Co., Ltd. is one of the leading manufacturers and suppliers of q345b carbon steel coil in China. If you're going to wholesale the newest q345b carbon steel coil made in China, welcome to get pricelist from our factory. All customized products are with high quality and competitive price.
Q345B Steel is a low alloy high-strength structural steel coil designed for medium to heavy engineering applications, where both strength and toughness are required at the same time.
Unlike plain carbon steels, Q345B uses alloying elements to improve performance, making it suitable for load-bearing structures, welded fabrication, and heavy industrial manufacturing.
It is one of the most widely used export-grade structural steels from China.
International Equivalent Grades:
|
Region |
Equivalent Grade |
|
China |
Q345B |
|
USA |
ASTM A572 Grade 50 / A572 Gr.50 |
|
Japan |
SM490 |
|
Europe |
S355JR / S355J2 |
|
Germany |
St52-3 |
Mechanical Properties:
|
Property |
Value |
|
Yield Strength |
≥ 345 MPa |
|
Tensile Strength |
470–630 MPa |
|
Elongation |
≥ 21% |
Why Q345B is widely used in coil form
- In coil production and fabrication industries, Q345B is valued because it:
- Maintains strength after cutting and forming
- Performs well in welded structures
- Supports heavy-duty roll forming
- Reduces overall structural weight while keeping strength
- It is often chosen when Q235 is not strong enough, but cost still matters compared to stainless or higher alloy steels.
Typical Applications
- Steel structure buildings
- Bridges and infrastructure projects
- Heavy machinery manufacturing
- Crane and lifting equipment
- Vehicle chassis and frames
- Wind power structural parts
- Industrial welded structures
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