Q390GJC High-Strength Carbon Steel Plate for Ship/Bridge (Hot-Rolled)

 

Q390GJC is a high-strength low-alloy structural steel plate specified in Chinese standards (primarily GB/T 19879 Steel Plates for Building Structures and GB/T 1591 High-Strength Low-Alloy Structural Steels). It is engineered for critical engineering structures such as large bridges, ship hulls, and high-rise building frameworks. The designation reflects its core attributes: "Q390" indicates a minimum yield strength of 390 MPa; "GJ" stands for "Gao Jian" (high-rise construction/structural use); and "C" denotes its impact toughness grade (tested at 0°C). Below is a detailed overview of its characteristics, performance, applications, and production processes:

1. Chemical Composition (Typical, % by Weight)

Q390GJC's composition is optimized to balance strength, toughness, and weldability, with microalloying elements enhancing grain refinement and precipitation strengthening:

 

Element	Content Range	Role
Carbon (C)	≤0.20%	Ensures strength without sacrificing weldability (low carbon reduces cold cracking risk).
Manganese (Mn)	1.00–1.60%	Enhances strength and toughness; promotes solid solution strengthening.
Silicon (Si)	0.20–0.55%	Acts as a deoxidizer; improves surface quality and oxidation resistance.
Niobium (Nb)	0.015–0.060%	Refines austenite grains during rolling; forms carbides (NbC) for precipitation strengthening.
Vanadium (V)	0.02–0.15%	Synergizes with Nb to refine grains and enhance low-temperature toughness.
Titanium (Ti)	≤0.20%	Controls nitrogen content; prevents grain coarsening during welding.
Phosphorus (P)	≤0.030%	Strictly limited to avoid cold brittleness (critical for low-temperature bridge/ship environments).
Sulfur (S)	≤0.025%	Restricted to reduce hot cracking during welding and rolling.

 

 

 

 

 

 

 

 

 

 

 

 

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 Q390GJC High-Strength Carbon Ship/Bridge Hot Rolled 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.
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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