SM520B Welded Structural Steel Plate

SM520B is a Japanese Industrial Standard (JIS) hot-rolled structural steel plate designed for welded general-purpose structures, including buildings, bridges, ships, rail vehicles, and heavy machinery. The designation "SM" stands for Steel Material under Japanese standards, while "520" indicates a tensile strength range of 520–640 MPa. The suffix "B" denotes its quality grade, with SM520B and SM520C being the primary grades under JIS G3101 (2004) or JIS G3106 standards. SM520B is typically supplied in hot-rolled or normalized conditions to meet diverse engineering requirements.

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SM520B Steel Plate Stock Sizes & Custom Processing Services

Available in versatile dimensions for immediate delivery or custom orders:

Standard Stock Dimensions

Thickness Range	Width Range	Length Range	Availability
10mm	2000–2500mm	12,000mm	In stock, cut-to-size
12–16mm	2000–2500mm	12,000mm	In stock, cut-to-size
16–20mm	2000–3000mm	12,000mm	In stock, cut-to-size
20–40mm	2000–3200mm	12,000mm	In stock, cut-to-size
40–60mm	2000–2800mm	12,000mm	In stock, cut-to-size
60–75mm	1800–2500mm	12,000mm	In stock, cut-to-size

SM520B high-strength welded structural steel Customization Options:

Thickness: 8mm to 150mm (extended to 300mm upon request).

Width: Up to 3900mm.

Length: Up to 14,000mm.

Processing: Precision cutting (laser, plasma, or flame), edge bevelling, and drilling per technical drawings.

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Key Applications of SM520B 520MPa tensile steel plate

SM520B is widely adopted across industries due to its high strength-to-weight ratio, weldability, and durability:

Construction

Beams, columns, and floor plates in high-rise buildings to support structural loads.

Bridge Engineering

Main girders and deck panels for enhanced safety and load-bearing capacity.

Pressure Vessels & Storage

Tanks, reactors, and oil/gas containers requiring resistance to internal pressure.

Automotive Manufacturing

Chassis and body reinforcements to improve vehicle safety and payload capacity.

Shipbuilding

Hull and deck components resistant to seawater corrosion and dynamic stresses.

Railway Infrastructure

Tracks and railway switches for stable and reliable rail operations.

Heavy Machinery

Cranes, mining equipment, and power plant structures subjected to dynamic loads.

high strength steel plate Mechanical Property

Differences Between SM520A, SM520B, and SM520C (JIS G3106 Structural Steel)

The SM520 series under JIS G3106 includes three grades-SM520A, SM520B, and SM520C-designed for welded structural applications. Their differences lie in chemical composition, mechanical properties, impact toughness requirements, and applications. Here's a detailed comparison:

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1. Chemical Composition

Grade	Carbon (C) Max	Silicon (Si) Max	Manganese (Mn)	Phosphorus (P) Max	Sulfur (S) Max	Carbon Equivalent (Ceq) Max
SM520A	~0.20%	~0.55%	~1.60%	0.035%	0.035%	~0.44%
SM520B	≤0.18%	≤0.55%	≤1.60%	0.030%	0.030%	≤0.44%
SM520C	≤0.18%	≤0.55%	≤1.60%	0.025%	0.025%	≤0.42%

Key Notes:

SM520B/C have stricter limits on P and S (impurities) for improved weldability.

SM520C has a slightly lower carbon equivalent (Ceq), reducing cold-cracking risks in welding.

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2. Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Test Requirement
SM520A	≥355	520–640	≥17	Not required
SM520B	≥355	520–640	≥17	Room temperature
SM520C	≥355	520–640	≥17	0°C (Charpy V-notch)

Key Notes:

All grades share the same tensile/yield strength range but differ in toughness testing.

SM520C requires low-temperature impact testing (≥27J at 0°C), making it suitable for cold environments.

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3. Application Focus

Grade	Primary Use Cases
SM520A	General-purpose structures with no strict toughness requirements (e.g., non-critical buildings, static equipment).
SM520B	Dynamic load-bearing structures needing room-temperature toughness (e.g., bridges, cranes, vehicles).
SM520C	High-stress or low-temperature environments (e.g., offshore platforms, cold-region bridges, pressure vessels).

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4. Delivery Condition

SM520A/B: Typically supplied in hot-rolled condition.

SM520C: Often delivered in normalized (heat-treated) condition to enhance uniformity and toughness.

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5. Key Takeaways

SM520A: Basic grade for non-critical, static structures. No mandatory impact testing.

SM520B: Balanced weldability and toughness for general dynamic loads.

SM520C: Premium grade for harsh conditions (low temperatures, heavy cyclic loads).

 

 

 

We have more than 15 years of experience in manufacturing and exporting, please contact me if you have any customised requirements for your SM520B high strength low alloy hsla steel or other hot rolled steel sheets.

 

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