Gnee is committed to social responsibility, innovation, and specialization, aiming to provide high-quality JIS G3101 SS400 hot-rolled shaped steel beams to domestic and international customers.
Our mission is to deliver tailored solutions, solve technical challenges, and meet all customer requirements with reliable service and professional expertise.
SS400 is a carbon structural steel defined under the JIS G3101 standard. The first "S" stands for Steel, the second "S" for Structure, and "400" indicates the minimum tensile strength of 400 MPa.
SS400 beams are widely used in bridges, buildings, vehicles, machinery frameworks, and general structural applications due to their excellent weldability, machinability, and moderate strength.
International Equivalent Materials
| Country/Region | Standard | Equivalent Grade |
|---|---|---|
| Taiwan | CNS | SS400 |
| China | GB | Q235A, Q235B, Q235C, Q235D |
| Japan | JIS | SS400 |
| USA | ASTM | A570 Gr.30, A570 Gr.45, A36/A283M Gr.D |
| Germany | DIN | St37-2, Ust37-2, RSt37-2 |
Chemical Composition (Max % by weight)
| Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| SS400 | – | – | – | 0.05 | 0.05 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Resistance (J) |
|---|---|---|---|---|
| SS400 | 245–235 | 400–510 | 17–21 | ≥17–21 |
SS400 beams provide good formability, weldability, and toughness, suitable for general structural applications where high hardness or wear resistance is not critical.
Products Applications
SS400 shaped steel beams are widely used in:
Bridge Construction: Beams, girders, trusses, and columns supporting medium-span bridges.
Building Frames: Structural beams and columns in residential, commercial, and industrial buildings.
Machinery & Vehicle Frames: Supports, braces, and small structural members for machinery bases and vehicle chassis.
General Structural Fabrication: Industrial platforms, warehouse frameworks, and auxiliary structural components.
Gnee's JIS G3101 SS400 hot-rolled shaped steel beams offer reliable mechanical performance, excellent weldability, and broad applicability across structural, civil, and industrial projects.
With strong technical support, customizable solutions, and global shipping capabilities, Gnee is a trusted supplier for high-quality SS400 structural steel beams.
Q1: What are SS540 beams?
A: SS540 beams are hot-rolled structural I-beams or H-beams made from SS540 steel, a high-strength Japanese standard (JIS G3101) structural steel. They are designed for heavy-duty construction and industrial projects requiring superior load-bearing capacity.
Q2: What sizes and forms are available for SS540 beams?
A: SS540 beams are available in various heights, flange widths, and thicknesses. Standard lengths typically range from 6 to 12 meters, and beams can be supplied as I-beams, H-beams, or custom-cut sections according to project requirements.
Q3: What are the mechanical properties of SS540 beams?
A: They have a tensile strength of 540–670 MPa, yield strength ≥355 MPa, and elongation ≥18%, making them suitable for structural frameworks, bridges, and industrial supports.
Q4: Can SS540 beams be welded and fabricated?
A: Yes, they have good weldability and machinability. Common welding methods include MIG, TIG, and arc welding. For thick flanges or web sections, preheating may be recommended to avoid cracking.
Q5: Where are SS540 beams commonly used?
A: SS540 beams are used in heavy construction projects such as high-rise buildings, bridges, industrial plants, and shipbuilding. Their high strength allows for longer spans and more efficient structural design.
Q6: How does SS540 compare with SS490 beams?
A: SS540 beams provide higher yield and tensile strength than SS490 beams, allowing for heavier load-bearing structures and improved durability, while still maintaining good weldability.