| Grade | Yield (MPa) | Typical Use | Equivalent (EN/ASTM/GB) |
|---|---|---|---|
| SM400 | 245 | General structure | S235 / A36 / Q235B |
| SM490 | 325 | Medium structure | S355 / A572 Gr.50 / Q345B |
| SM520 | 355 | Heavy welded structure | S420 / A572 Gr.60 / Q420B |
| SM570 | 450 | High-strength projects | S460 / A572 Gr.65 / Q460 |
SM570 Structural Steel Plate
SM570 high-strength structural steel plate for welded structures, offering exceptional strength, toughness, and weldability for heavy-duty construction projects.
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Ultra-High Strength: Yield strength of 450 MPa suitable for heavy-load structural applications.
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Excellent Weldability: Low carbon equivalent ensures high-quality welding performance.
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Superior Toughness: Guaranteed impact resistance at low temperatures.
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Good Fatigue Resistance: Ideal for dynamic load-bearing structures.
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International Equivalent: Comparable to EN S460 / ASTM A572 Gr.65 / GB Q460.
SM570 Steel Description
SM570 is a high-tensile structural steel specified under JIS G3106, designed for welded structures that demand high strength and excellent impact toughness. It represents the upper end of the SM series (SM400–SM570), delivering enhanced load-bearing performance and weldability for critical construction and heavy machinery.
With a minimum yield strength of 450 MPa and tensile strength between 570–720 MPa, SM570 is ideal for bridges, cranes, offshore structures, and large building frameworks requiring strong yet ductile steel.
Available in SM570B and SM570C grades, both are optimized for welded applications:
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SM570B: Guaranteed impact energy at 0°C
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SM570C: Guaranteed impact energy at -20°C, suitable for low-temperature or offshore service
SM570 Technical Data Sheet
| SM570 Chemical Composition | |
| Element | Max / Range (%) |
| Carbon (C) | ≤ 0.18 |
| Silicon (Si) | ≤ 0.55 |
| Manganese (Mn) | ≤ 1.70 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| SM570 Mechanical Properties | |
| Property | Typical Value |
| Yield Strength (ReL) | ≥ 450 MPa |
| Tensile Strength (Rm) | 570–720 MPa |
| Elongation (A5) | ≥ 17% |
| Impact Energy (Charpy V) | SM570B: 27 J @ 0°C / SM570C: 27 J @ -20°C |
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SM570 Applications
SM570 steel plate is widely used in high-strength welded structures that require superior performance under heavy loads and dynamic stress, including:
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Bridges and elevated highways
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Offshore platforms and marine structures
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Cranes, heavy machinery, and mining equipment
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High-rise building frameworks and industrial facilities
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Storage tanks and pressure-resistant vessels
Its combination of high yield strength, ductility, and weldability makes SM570 one of the most reliable structural steels for critical engineering and infrastructure projects.
SM570 Steel FAQs
What makes SM570 different from SM490 or SM520?
SM570 offers higher yield strength (450 MPa) and tensile strength (up to 720 MPa), designed for critical heavy-duty and high-stress welded structures.
What are SM570B and SM570C used for?
Both are used in bridges, offshore platforms, and heavy machinery. The “C” grade provides better low-temperature toughness, ideal for cold regions or marine applications.
What are the equivalent international grades for SM570?
Equivalent grades include EN S460 / ASTM A572 Grade 65 / GB Q460, all of which are high-tensile structural steels used for welded fabrication.
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