E335 Low Alloy High Strength Steel
Products Description Typical Applications: Bridges : Used for main girders and supports in large-span structures (e.g., Q345qD in Chinese standards). Ships and Offshore Structures : Resists corrosion and dynamic loads in marine environments (e.g., AH36/DH36/EH36 in shipbuilding). Pressure...
Description
Products Description
Typical Applications:
Bridges: Used for main girders and supports in large-span structures (e.g., Q345qD in Chinese standards).
Ships and Offshore Structures: Resists corrosion and dynamic loads in marine environments (e.g., AH36/DH36/EH36 in shipbuilding).
Pressure Vessels and Pipelines: Withstands high internal pressures in oil/gas transmission and storage (e.g., ASTM A516 Gr. 70).
Heavy Machinery and Vehicles: Crane booms, truck frames, and mining equipment requiring high strength-to-weight ratios (e.g., S460NL in European standards).
Industrial and Civil Structures: High-rise buildings, stadiums, and steel frameworks (e.g., Q390/G304).
Comparison with Carbon Steels:
| Property | Low-Alloy High-Strength Steel | Carbon Structural Steel |
|---|---|---|
| Yield Strength | 295–690 MPa | 195–275 MPa |
| Tensile Strength | 410–835 MPa | 370–500 MPa |
| Impact Toughness (-20°C) | ≥27 J (for grades like Q345D) | Poor at low temperatures |
| Weight for Same Load | 20–30% lighter | Heavier |
| Weldability | Good (with proper procedures) | Good |
| Cost | Slightly higher | Lower |
Mechanisms of Alloying:
Grain Refinement: Microalloy carbides (e.g., NbC, TiC) pin grain boundaries during cooling, preventing coarsening.
Precipitation Hardening: Fine particles of alloy carbides/nitrides (e.g., V(CN)) precipitate from the matrix, hindering dislocation movement.
Solid Solution Strengthening: Mn and Si dissolve in ferrite, increasing lattice distortion and shear stress.
Standards and Grades:
Chinese Standards: GB/T 1591 (Q345/Q355, Q390, Q420), GB/T 712 (shipbuilding steels).
European Standards: EN 10025-3 (S275NL, S355NL, S420NL).
American Standards: ASTM A572 (Gr. 50/65), ASTM A633 (structural quality).
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 E335 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.
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