High Strength Steel Plate Q390

 

 

Applications

Q390 is ideal for structures requiring moderate strength and good formability:

 

Construction: Bridges, industrial buildings, and high-rise frameworks.

Machinery: Cranes, agricultural equipment, and mechanical parts (e.g., gears, shafts).

Transportation: Truck frames, railway wagons, and ship components.

Energy: Wind turbine supports and pressure vessels with non-critical loads.

Chemical Composition (Typical Values, wt.%)

Element	Q390B/C/D/E Range	Key Roles
Carbon (C)	≤0.20	Enhances strength but limits weldability if excessive.
Silicon (Si)	0.20–0.55	Improves resistance to oxidation and corrosion.
Manganese (Mn)	1.00–1.60	Boosts hardenability and improves tensile strength.
Phosphorus (P)	≤0.030 (B)/≤0.025 (C/D/E)	Reduces brittleness when controlled.
Sulfur (S)	≤0.030 (B)/≤0.025 (C/D/E)	Enhances ductility and reduces hot cracking.
Niobium (Nb)	0.015–0.060	Refines grain structure and increases strength via precipitation.
Vanadium (V)	0.02–0.15	Contributes to microstructural strengthening.
Titanium (Ti)	0.02–0.20	Forms stable carbides, improving toughness.
Aluminum (Al)	≥0.015 (for C/D/E)	Acts as a deoxidizer and enhances low-temperature impact resistance.

 

Note: Grades with higher impact resistance (e.g., D/E) have stricter impurity limits and added alloying for toughness.

 

 

 

 

 

 

Processing and Fabrication

1. Welding

Weldability: Generally good, but higher carbon  (CEV) in thick sections may require preheating.

Preheating: 60–100°C for thickness >30mm or high-restraint joints.

Weld Consumables: Match strength with E50XX electrodes (e.g., E5015 for low-hydrogen applications) or ER50-G gas-shielded wires.

Heat Input: Control ≤20 kJ/cm to avoid HAZ softening or coarsening.

2. Cutting and Forming

Cutting: Plasma, laser, or oxy-fuel cutting; post-cut cleaning to remove oxidation.

Forming: Cold forming for simple bends; hot forming (850–1050°C) for complex shapes to prevent cracking.

3. Heat Treatment

Typically used in the as-rolled or normalized state. Quenching + tempering is rare but may improve strength for specialized applications.

 

 

 

 

 

 

 

 

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 High Strength Steel Plate Q390, 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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