Application Fields

 

Grade	Typical Application Scenarios
Q345B	- Bridge and high-rise building steel structures - Crane booms, large storage tanks - General industrial factory buildings and vehicle frames
Q345D	- Bridges and wind turbine towers in cold regions (e.g., Northeast and Northwest China) - Low-temperature pressure vessels, chemical equipment - High-toughness structures for winter construction

 

Comparison with Q235B

 

Property/Grade	Q235B (Carbon Steel)	Q345B/Q345D (Low Alloy Steel)
Yield Strength	235~185 MPa (decreases with thickness)	345~335 MPa (40% higher strength)
Impact Test Temperature	20℃ (only normal temperature toughness)	-20℃ (Q345D meets low-temperature impact requirements)
Alloying Elements	None (pure carbon steel)	Contains Mn, V, Nb (improves strength and weather resistance)
Typical Applications	Ordinary load-bearing structures (e.g., building beams, columns)	Medium/high-strength, weather-resistant or low-temperature structures (e.g., bridges, wind power, chemical equipment)

 

Standards and Production Notes

 

Standard: GB/T 1591 Low Alloy High-Strength Structural Steel, requiring melting analysis, mechanical property tests (tensile, impact), and flaw detection (e.g., ultrasonic testing).

Production Process:

Smelting: Killed steel process to ensure chemical uniformity.

Q345D Specifics: Grain size control (≥Grade 5) and residual element limits (total Cr, Ni, Cu ≤0.7%) to guarantee low-temperature toughness.

 

 

 

 

 

 

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our Q345B /Q345D High Strength Low Alloy Carbon Steel Plate and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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