Low Alloy High Strength Bridge Building Steel Plate

Low alloy high strength bridge building steel plates are specialized structural materials designed to withstand heavy loads, dynamic stresses, and environmental challenges in bridge construction. These plates combine low alloy content with high strength, toughness, and durability, making them ideal for critical bridge components. Below is a detailed overview of their characteristics, applications, and technical specifications:

1. Key Standards and Grades

Standards:

China: GB/T 1591 (low alloy high strength structural steel), GB/T 714 (bridge steel).

Europe: EN 10025-3/-4 (fine-grained structural steel).

USA: ASTM A709 (high-strength low-alloy steel for bridges).

Common Grades:

China: Q345qD, Q370qE, Q420qE ("q" denotes bridge steel; letters indicate impact test temperatures: D=-20℃, E=-40℃).

Europe: S355NL, S420ML (normalized or thermomechanical rolled, with "L" indicating low-temperature toughness).

USA: ASTM A709 Gr50, Gr70 (Gr50: yield strength ≥345 MPa; Gr70: ≥485 MPa).

 

2. Mechanical Properties

Grade	Yield Strength (ReL, MPa)	Tensile Strength (Rm, MPa)	Elongation (%)	Impact Test (Temperature, KV2, J)
Q345qD	≥345 (≤16mm)	470–630	≥21	-20℃, ≥34J
Q420qE	≥420 (≤16mm)	520–680	≥19	-40℃, ≥27J
ASTM A709 Gr50	≥345	450–620	≥18	-29℃ (optional), ≥27J

 

 

 

 

 

 

 

 

Key Features:

High Strength-to-Weight Ratio: Reduces material usage and structural weight compared to carbon steel.

Fatigue Resistance: Designed to withstand cyclic loading from traffic and environmental vibrations.

Low-Temperature Toughness: Grades like Q345qE or S355NL perform well in cold climates (impact tests at -40℃).

 

 

 

 

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 Low Alloy And High Strength Bridge Building 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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