🟪 Product Overview

High‑Strength Structural Steel Plate is engineered for superior load‑bearing capacity, enhanced toughness, and excellent structural performance.

Compared with mild structural steel (A36 / Q235 / SS400)，high‑strength structural steel offers:

• Higher yield and tensile strength
• Better resistance to deformation
• Improved performance under dynamic loads
• Reduced material weight for the same structural capacity
• Greater efficiency in large‑scale engineering projects

This category includes the most widely used high‑strength structural steel grades worldwide.

🟪 Key Features

• High yield strength for demanding structural applications
• Excellent toughness and impact resistance
• Reduced structural weight with higher load capacity
• Suitable for welding, cutting, and fabrication
• Ideal for heavy‑duty engineering and construction

🟪 Included Grades

This page covers all major high‑strength structural steel grades:

ASTM / ASME

• A572 Gr 50 / 60 / 65
• A656 Gr 50 / 60 / 70 / 80
• A633 Gr A / C / D / E
• A514（Quenched & Tempered）
• A709（36 / 50 / 50W / HPS50W）

EN / DIN

• S355JR / S355J0 / S355J2
• S420 / S460

GB / Chinese Standard

• Q355B / Q355C / Q355D / Q355E
• Q420 / Q460

🟪 Mechanical Properties (Typical)

Grade	Yield Strength	Tensile Strength	Impact Toughness
S355JR	≥355 MPa	470–630 MPa	27 J @ 20°C
Q355D	≥355 MPa	490–630 MPa	27 J @ −20°C
A572 Gr 50	≥345 MPa	450–620 MPa	Good
A656 Gr 70	≥485 MPa	620–795 MPa	High
A514	≥690 MPa	760–895 MPa	Very High
A709 Gr 50W	≥345 MPa	485–620 MPa	Weathering grade

🟪 Chemical Composition (Typical)

Grade	C (%)	Mn (%)	Si (%)	P (%)	S (%)
S355JR	≤0.24	≤1.60	≤0.55	≤0.045	≤0.045
Q355D	≤0.20	≤1.70	≤0.50	≤0.035	≤0.035
A572 Gr 50	≤0.23	1.35	≤0.40	≤0.040	≤0.050
A514	≤0.21	≤1.00	≤0.35	≤0.035	≤0.035

🟪 Product Specifications

Thickness

• 6 – 200 mm

Width

• 1500 – 3000 mm

Length

• As required（custom cutting available）

Delivery Conditions

• Hot Rolled
• Normalized
• Quenched & Tempered（A514 / A656 / A633）

🟪 Applications

Construction & Infrastructure

• High‑rise buildings
• Steel structures
• Industrial plants
• Heavy‑load support systems

Bridges & Engineering

• Bridge beams
• Girders
• Structural members
• Load‑bearing components

Heavy Machinery & Equipment

• Cranes
• Mining equipment
• Excavators
• Lifting equipment

Transportation & Fabrication

• Truck frames
• Trailers
• Railway components

🟪 Why Choose WelSteels

• Full range of high‑strength structural steel grades
• Reliable mechanical performance
• Quenched & tempered options available
• SGS / BV inspection
• Export‑grade seaworthy packaging