Description

Technical Parameters

Overview

ASTM A709 Grade 50 Bridge Steel Plate is a high-strength, low-alloy (HSLA) structural steel plate engineered specifically for bridge fabrication, structural framing, and heavy infrastructure. Processed via Advanced Thermo-Mechanical Controlled Processing (TMCP) or Normalizing, it provides an optimal yield strength of 345 MPa (50 ksi) with exceptional notch toughness for dynamic loading and low-temperature environments.

ASTM A709 Grade 50 Bridge Steel Plate

Specifications

Chemical Composition (ASTM A709 Gr.50)

Material	C	Si	Mn	P	S	Nb+V max
A709 Gr50	≤0.23	≤0.40	≤1.35	≤0.04	≤0.05	0.02-0.15

Mechanical Properties (ASTM A709 Gr.50)

Material	Yield strength MPa	Tensile strength MPa	Elongation δ200, %
A709 Gr50	345-470	450-600	21-35

Key Material Performance

Formulated with micro-alloying and controlled carbon equivalent (CEV ≤ 0.40%) to provide 345 MPa (50 ksi) yield strength for structural weight efficiency.

Maintains stable weldability under standard processes (SMAW, GMAW, SAW) with reduced risk of heat-affected zone hardening.

Processed via TMCP or normalizing to deliver reliable Charpy V-Notch impact toughness for AASHTO temperature zones.

A709 Gr.50 steel plate

Custom Processing & Fabrication Services

Precision Cutting: Flame cutting, Plasma cutting, and Laser cutting up to project dimensions.

Edge Preparation: Weld beveling (V, X, K-prep) according to AWS D1.5 Bridge Welding Code.

Surface Treatment: Shot blasting to Sa 2.5 / Sa 3.0 + Weldable shop primer (Epoxy/Zinc-rich).

Manufacturing Tolerances & Surface Quality

Dimensional & Shape Tolerances: Dimensional and shape tolerances adhere strictly to ASTM A6/A6M. European EN 10029 Class B tolerances can be provided upon technical review.

Thickness Tolerance: Standard mill tolerance within ASTM A6 limits; custom restricted thickness tolerance available for high-precision bridge designs.

Surface Quality: Delivered in hot-rolled condition with scale removed, meeting ASTM A6 surface defect repair and inspection guidelines.

Typical Applications

Bridge Substructures & Superstructures: Plate girders, box girders, cross-beams, and splice plates.

Heavy Civil Infrastructure: Highway overpasses, railway bridges, and pedestrian walkways.

Marine & Coastal Structures: Structural framing exposed to low-temperature dynamic fatigue.

Manufacturing Capabilities & Quality Control

Mill Equipment: 4.1m wide-heavy plate rolling mill line, integrated with TMCP and online heat-treatment furnaces for precise mechanical properties.

100% In-House Inspection: CNAS-accredited laboratory equipped for chemical, tensile, Charpy V-Notch (CVN), bending, and microstructure analysis.

Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) available according to ASTM A435 / ASTM A578 (Level A/B/C) to guarantee internal soundness.

Full Traceability: Every plate is hard-stamped/ink-marked with Heat Number, Plate Number, Size, and Grade to ensure absolute accountability.

Global Project Support & Documentation

Proven Track Record: Trusted by heavy infrastructure contractors and bridge fabricators across Southeast Asia, the Middle East, and the Americas.

Mill Test Certificate (MTC): Issued in strict accordance with EN 10204 3.1 (or 3.2 where required), detailing full heat chemistry, mechanical properties, and CVN impact values.

Third-Party Approved: Seamless collaboration for pre-shipment inspections with international authorities including SGS, Bureau Veritas (BV), Intertek, and Lloyd's Register.

Secure Packaging: Plates are treated with anti-rust oil/primers, fitted with edge protectors, and secured in seaworthy bundling for break-bulk or Open Top / Frame containerized shipping.

Request a Precision Quote (RFQ Guide)

To help our engineering team provide an accurate quotation within 24 hours, please specify:

Dimensions & Quantity: Thickness × Width × Length, and Total Tonnage.

Impact Testing Requirements: AASHTO Temperature Zone (Zone 1, 2, or 3) or specific CVN Joules at target temperature.

Value-Added Processing: Beveling, Cutting, Shot Blasting (SA 2.5), or Painting requirements.

Inspection & Certification: Standard EN 10204 3.1 MTC or requirement for Third-Party Inspection (e.g., SGS / BV).

FAQ

Q: What thickness and dimension ranges can you supply?

A: Our standard supply range for ASTM A709 Grade 50 is 8 mm to 100 mm in thickness and up to 3,800 mm in width. For non-standard or ultra-thick bridge plates requiring normalized or TMCP processing, please consult our engineering department for mill capability confirmation.

Q: Can you meet specific AASHTO Charpy V-Notch (CVN) impact zones?

A: Yes. Impact testing can be performed at temperatures down to -30°C (-20°F) to strictly comply with AASHTO Zone 1, 2, or 3 requirements as specified by your bridge design.

Q: What are your typical production and delivery lead times?

A: Standard production usually takes 20 to 30 days depending on volume, with urgent orders scheduled for accelerated rolling.

Q: How do you protect steel plates against rust during sea freight?

A: Plates are treated with surface anti-rust oil or primers, wrapped in waterproof paper, and secured with steel edge protectors.

Q: What are your accepted payment terms for overseas buyers?

A: We accept Irrevocable LC at sight or T/T with a deposit, subject to agreement and order size.

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