Execution Standards

E690 (DD, E) generally complies with GB/T 1591-2018 Low-Alloy High-Strength Structural Steels. It may also equivalently follow international standards such as EN 10025 (European) or ASTM A514 (U.S.), particularly for applications requiring cross-regional certification.

Chemical Composition

Element	Content Range	Role
Carbon (C)	≤0.18%	Increases strength but must be controlled to prevent brittleness.
Manganese (Mn)	1.00%–1.60%	Strengthens the matrix and improves overall tensile strength.
Silicon (Si)	0.20%–0.55%	Enhances strength and improves deoxidation during steelmaking.
Phosphorus (P)	≤0.020%	Strictly controlled as an impurity to avoid cold brittleness.
Sulfur (S)	≤0.010%	Reduced to improve weldability and minimize hot cracking risks.
Chromium (Cr)	≤0.50%	Enhances hardenability and corrosion resistance, especially in harsh environments.
Nickel (Ni)	≤0.50%	Improves toughness and stabilizes the austenitic structure.
Molybdenum (Mo)	≤0.30%	Boosts high-temperature strength and resistance to corrosion and creep.
Niobium (Nb)	≤0.05%	Refines grain structure through precipitation, enhancing strength and toughness.
Vanadium (V)	≤0.10%	Provides precipitation strengthening by forming hard carbides/nitrides, increasing yield strength.

 

Delivery Condition

Quenched and Tempered (Q&T): The steel is typically delivered in this state to ensure optimal comprehensive mechanical properties (strength, toughness, and weldability) for direct use in engineering structures.

Typical Applications

Marine and Offshore Engineering:

Ocean platforms, decks, ship cranes, port machinery, leg piles, drilling rigs, and oil extraction platforms.

Ideal for structures exposed to high stress, corrosion, and dynamic loads (e.g., wave impact).

Heavy Industry:

Pressure vessels, construction machinery (e.g., excavator arms), and mining equipment (e.g., haul truck frames).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 E690(DD,E)Low Alloy High 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.

Hot Tags: e690(dd,e)low alloy high strength steel, China e690(dd,e)low alloy high strength steel suppliers, factory, CR2 Steel, CR1 Steel, HR500LA, HR0 Steel, CR210IF, CR180BH