Here is detailed information about Q390 High Yield Strength Steel, a low-alloy high-strength structural steel widely used in engineering applications:

 

Civil Engineering:

Large-span bridges, stadium roofs, and industrial  (factory buildings).

High-rise building frameworks and steel structures under dynamic loads.

Mechanical & Heavy Equipment:

Cranes, mining machinery, and agricultural equipment components.

Pressure vessels and pipelines in moderate-load industrial systems.

Transportation:

Railway car bodies, heavy-duty vehicle frames, and shipbuilding (with corrosion-resistant grades).

Cold-Climate Projects:

Structures in regions with sub-zero temperatures (e.g., Grade E for -40°C environments).

Comparison with Other Steel Grades

Steel Grade	Yield Strength (MPa)	Typical Applications	Key Advantage
Q235	235	Simple structures (e.g., brackets)	Low cost, low strength
Q345	345	General steel structures (bridges)	Balanced strength and affordability
Q390	390	Medium-high-strength structures	Higher load capacity than Q345
Q420	420	Heavy-duty structures (crane arms)	Ultra-high strength

 

 

 

 

 

 

 

 

 

 

 

Precautions for Use

Welding:

Use low-hydrogen welding rods or gas-shielded welding to prevent hydrogen-induced cracking.

Preheat thick sections and control cooling rates to avoid brittle microstructures.

Temperature Selection:

Choose Grade E for extremely cold environments (-40°C) and lower grades (B/C) for milder climates.

Inspection:

Verify mechanical properties (tensile, yield, elongation) and chemical composition during procurement.

Non-destructive testing (e.g., ultrasonic ) is critical for welded joints in critical structures.

Summary

Q390 steel offers a practical balance of strength, toughness, and cost, making it a popular choice for medium-to-high-strength applications. Its multiple quality grades allow flexibility in selecting the right material for specific environmental and loading conditions, from general construction to cold-region infrastructure.

 

 

 

 

 

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 Q390 High Yield Strength Steel, 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.
Our Cold-rolled Steel products are known for their durability and reliability.
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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