ASTM A572 Grade 55 (A572GR55) Structural Steel Plate supplier
General Description
As a production and export expert at SHH STEEL, we are pleased to present our ASTM A572 Grade 55 High-Strength Low-Alloy (HSLA) Steel Plates, also known as A572 Gr.55 or A572GR55. This grade offers higher strength than A572 Gr.50, making it suitable for structural applications requiring greater load-bearing capacity, such as bridges, high-rise buildings, heavy equipment frames, and transmission towers.
It features a minimum yield strength of 380 MPa (55 ksi) and a minimum tensile strength of 485 MPa (70 ksi), with good ductility and excellent weldability. SHH STEEL supplies these plates in thicknesses from 6mm to 50mm standard (custom up to thicker sections available where permitted), widths up to 4600mm, and lengths up to 12000mm. The controlled-rolled condition optimizes mechanical properties and toughness.
For you exploring ASTM A572 Gr.55 properties or equivalents, this grade provides an efficient balance of higher strength and weldability through microalloying with niobium and vanadium. Our plates undergo strict quality control and are supplied with mill test certificates for full traceability.
With a relatively low carbon equivalent, A572 Gr.55 plates offer good weldability using common processes. SHH STEEL ensures consistent quality and reliable performance for critical structural projects worldwide.
ASTM A572 Grade 55 Material Specification
ASTM A572 Grade 55 steel plates are governed by ASTM A572/A572M. This specification covers high-strength low-alloy columbium-vanadium structural steel for plates used in riveted, bolted, or welded construction. SHH STEEL supplies plates in hot-rolled or controlled-rolled conditions. Standard thicknesses range from 6mm to 50mm (custom available within specification limits), with widths up to 4600mm and lengths to 12000mm. Ultrasonic testing and dual certification with EN or GB standards are available. All material is supplied with mill test certificates for traceability.
| Specification Element | Requirement | SHH STEEL Compliance | Keywords |
|---|---|---|---|
| Primary Standard | ASTM A572/A572M Grade 55 | High-strength structural steel | A572 Gr.55 specification |
| Thickness Range | 6-50mm (custom available) | Mill Test Certificate | A572 Gr.55 dimensions |
| Width/Length | Up to 4600mm / 12000mm | Custom fabrication available | A572 Gr.55 size options |
| Ultrasonic Testing | No laminations (Class 1 or equivalent) | Per ASTM A435 / A6 | A572 Gr.55 inspection |
| Heat Treatment | Hot-rolled / Controlled-rolled | Optimized properties | A572 Gr.55 delivery condition |
ASTM A572 Grade 55 Chemical Composition
At SHH STEEL, the chemical composition of ASTM A572 Grade 55 is tightly controlled. Carbon is limited to approximately 0.25% max, manganese up to 1.35%, with phosphorus and sulfur capped at low levels. Microalloying with niobium and vanadium enhances strength through grain refinement and precipitation hardening while maintaining good weldability.
| Element | Heat Analysis (%) | Standard Limit | Role | Keywords |
|---|---|---|---|---|
| Carbon (C) | ≤0.25 | 0.25 max | Strength and weldability balance | A572 Gr.55 carbon |
| Manganese (Mn) | ≤1.35 | 1.35 max | Strength and hardenability | A572 Gr.55 manganese |
| Phosphorus (P) | ≤0.04 | 0.04 max | Brittleness control | A572 Gr.55 phosphorus |
| Sulfur (S) | ≤0.05 | 0.05 max | Weldability | A572 Gr.55 sulfur |
| Niobium (Nb) + Vanadium (V) | Per specification | Microalloying range | Grain refinement & strength | A572 Gr.55 microalloying |
ASTM A572 Grade 55 Mechanical Properties
ASTM A572 Grade 55 plates deliver higher strength performance. Minimum yield strength is 380 MPa (55 ksi), with tensile strength of 485 MPa (70 ksi) minimum. Elongation is typically 17% minimum in 8 inches or 20% in 2 inches. The material offers good toughness for structural service.
| Property | Value | Test Method | Keywords |
|---|---|---|---|
| Tensile Strength | 485 MPa min (70 ksi) | ASTM A370 | A572 Gr.55 tensile |
| Yield Strength | 380 MPa min (55 ksi) | ASTM A370 | A572 Gr.55 yield |
| Elongation | 17-20% min | ASTM A370 | A572 Gr.55 elongation |
Delivery Conditions
SHH STEEL delivers ASTM A572 Gr.55 plates primarily in hot-rolled or controlled-rolled conditions. Normalized condition is available upon request. Heat numbers provide full traceability. Efficient global logistics support timely delivery.
| Condition | Description | Keywords |
|---|---|---|
| Hot-Rolled / Controlled-Rolled | Standard mill delivery | A572 Gr.55 hot rolled |
| Normalized | Available on request | A572 Gr.55 normalized |
Tolerances
Tolerances follow ASTM A6. Thickness, width, length, and flatness are strictly controlled. Tighter tolerances (e.g., EN 10029) are available for precision projects.
| Tolerance Type | Value | Standard | Keywords |
|---|---|---|---|
| Thickness / Width / Length | Per ASTM A6 (± standard or custom) | ASTM A6 | A572 Gr.55 tolerance |
| Flatness | 3mm per meter typical | ASTM A6 | A572 Gr.55 flatness |
Weldability
ASTM A572 Gr.55 offers good weldability with appropriate procedures. Low carbon equivalent supports common welding processes (SMAW, GMAW, SAW). Preheat may be required for thicker sections. Low-hydrogen consumables are recommended.
| Weldability Factor | Value/Condition | Recommended Process | Keywords |
|---|---|---|---|
| Carbon Equivalent | Relatively low | SMAW, GMAW, SAW | A572 Gr.55 weldability |
| Preheat | Recommended for thicker sections | Per AWS D1.1 | A572 Gr.55 welding |
Global equivalents for ASTM A572 Gr.55
| Grade | Standard | Yield (MPa) | Keywords |
|---|---|---|---|
| A572 Gr.55 | ASTM A572 | 380 min | A572 Gr.55 equivalent |
| S355J2 / S355K2 | EN 10025 | 355 | A572 Gr.55 EN equivalent |
| Q355B / Q355C | GB/T 1591 | 355 | A572 Gr.55 GB equivalent |
| SM490B / SM520 | JIS G3106 | 325-365 | A572 Gr.55 JIS equivalent |
Supplementary Requirements
Options include Charpy impact testing, ultrasonic examination, and product analysis per project requirements.
Applications
ASTM A572 Gr.55 is ideal for structural applications requiring higher strength than Gr.50.
| Application | Typical Use | Keywords |
|---|---|---|
| Bridges & Heavy Structures | Higher load capacity | A572 Gr.55 bridge |
| Buildings & Towers | Strength-to-weight efficiency | A572 Gr.55 building |
| Heavy Equipment Frames | Durability under stress | A572 Gr.55 equipment |
Why Choose SHH STEEL
SHH STEEL provides ASTM A572 Grade 55 plates with consistent quality, full certification, and flexible supply. Our experience in global exports ensures reliable delivery and technical support.
Advantage | Benefit | Keywords —|—|—|— Certified Quality | ASTM compliant + MTC | A572 Gr.55 certified Custom Supply | Flexible sizes and processing | A572 Gr.55 custom Global Experience | Proven export to 50+ countries | A572 Gr.55 trusted supplier
FAQ
- What is ASTM A572 Grade 55 used for?It is used for structural applications such as bridges, buildings, and heavy equipment where higher strength than Gr.50 is required.
- How does A572 Gr.55 compare to Gr.50?Gr.55 offers higher yield (380 MPa vs 345 MPa) and tensile strength, allowing for lighter or stronger designs in demanding structures.
- What are the equivalents of A572 Gr.55?Common equivalents include S355J2 (EN), Q355B (GB), and certain SM490/SM520 grades (JIS).
- What is the typical thickness range for A572 Gr.55?Standard production is up to 50mm, with custom options available depending on project
Conclusion
SHH STEEL’s ASTM A572 Grade 55 High-Strength Low-Alloy Steel Plates deliver enhanced strength and reliable performance for structural projects. With precise quality control, technical support, and global supply capability, we provide trusted solutions for bridges, buildings, and heavy industry. Contact SHH STEEL for your A572 Gr.55 requirements.
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