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Mild Steel Sheet SS400
As a typical mild steel plate, SS400 is widely used globally, particularly in the Asian market, for structural components requiring moderate strength and good formability or weldability, thanks to its excellent overall performance, outstanding workability, and high cost-effectiveness.
SS400 is a common structural rolled steel defined in the Japanese JIS G 3101 standard.
"S": Steel
"S": Structure
"400": Denotes a minimum tensile strength of 400 MPa or higher
| Feature Category | Specific Performance | Core Value Brings to Customers |
|---|---|---|
| Processing Performance | Excellent cold bending, stamping, and shearing performance; excellent weldability (no complex preheating required). | Suitable for processing complex components, high manufacturing efficiency, and low scrap rates. |
| Economical | Low raw material costs, low processing energy consumption, and relatively simple process requirements. | Significantly reduces overall project costs and improves product price competitiveness. |
| Guaranteed Supply | Large-scale production by major global and domestic steel mills, offering a wide range of specifications. | Sufficient and stable supply, short procurement cycles, and guaranteed project progress. |
In-depth analysis: SS400 key performance indicators and standard requirements
Chemical Composition (JIS G 3101 Requirements)
SS400 has relatively loose requirements on chemical composition, with the focus on controlling carbon content to ensure good weldability and plasticity, as well as limiting impurity elements such as sulfur and phosphorus to ensure basic quality.
Carbon (C): ≤ 0.29% (Low carbon is essential for good weldability, ductility, and toughness).
Manganese (Mn): No specific range is specified, but steel mills typically control it to a reasonable level to optimize performance.
Phosphorus (P): ≤ 0.050% (High phosphorus levels can cause cold brittleness).
Sulfur (S): ≤ 0.050% (High sulfur levels can cause hot brittleness, affecting weldability and toughness).
Silicon (Si): No specific range is specified; it is typically present as a deoxidizer.
Mechanical Properties (JIS G 3101 Requirements)
Mechanical properties are the core evaluation criteria for SS400 mild steel. The standard requires them to be determined through tensile testing.
| Yield Strength (σs) | ≥ 245 MPa (Thickness ≤ 16mm) |
|---|---|
| Tensile Strength (σb) | 400-510 MPa (Must be above 400 MPa but not exceed 510 MPa to ensure plasticity) |
| Elongation (δ) | Thickness < 5mm: ≥ 23%; Thickness 5mm - < 16mm: ≥ 21%; Thickness 16mm - < 40mm: ≥ 19%; Thickness 40mm - < 63mm: ≥ 17% (Elongation reflects the plastic deformation capacity of the material) |
Diverse Application Scenarios
Building Structures (Core Applications)
Primary and secondary steel structures such as steel columns, beams, purlins, wall beams, and supports for factories and warehouses. Ancillary steel structures such as building platforms, stairs, railings, and access walkways. Lightweight portal frame components.
Construction Machinery and Vehicle Manufacturing
Cab frames, panels, fuel tanks, tool boxes, non-load-bearing supports, floors, and guardrails for excavators, loaders, and cranes. Floors, side panels, sub-beams, various supports, and protective devices for trucks and trailers.
Cab frames, panels, fuel tanks, tool boxes, non-load-bearing supports, floors, and guardrails for excavators, loaders, and cranes. Floors, side panels, sub-beams, various supports, and protective devices for trucks and trailers.
General Machinery and Machining
Protective covers, housings, bases, and electrical cabinets for various machine tools. Frames, roller supports, hoppers, and non-load-bearing platforms for conveying equipment. Fixtures and fixtures, and mold pads.
Agricultural Equipment
Hoods, grain silos, non-critical structural components, and supports for tractors and harvesters.
Warehousing and logistics
Heavy-duty racking (beams and columns - accurate load calculation required), storage cages, logistics carts, and pallets (heavy duty).
Why choose us as your Mild Steel Sheet SS400 supplier?
Superior Quality, Guaranteed at the Source
We rigorously select large, reputable steel mills as our core supply sources, ensuring they fully comply with JIS G 3101 standards and offer a Manufacturer's Quality Certificate (MTC).
We conduct rigorous visual inspections (flatness, surface defects such as cracks, scars, and folds) and dimensional checks (thickness, width, and length tolerances) before warehousing to prevent the influx of substandard products.
Complete Specifications and Sufficient Inventory
Plate: Thicknesses range from 1.0mm to 200mm+, with common widths of 1000mm, 1250mm, 1500mm, 1800mm, 2000mm, and 2200mm. Custom cuts are available. We maintain a constant supply of medium and thin plates.
Professional Processing, One-Stop Service
High-Precision Cutting: We offer laser, plasma, flame, and waterjet cutting to meet diverse precision and efficiency requirements.
Forming and Processing: Professional bending (CNC bending machine) and rolling (plate rolling machine).
Drilling and Tapping: Precisely complete connection holes.
Surface Treatment: Pre-treatment services such as sandblasting, shot blasting, and primer spraying are provided to enhance component weather resistance and subsequent paint adhesion.
Based on your drawings or requirements, we provide in-depth processing solutions from raw materials to semi-finished/finished products, saving steps, reducing costs, and shortening cycle times.
Technical Consulting and Professional Support
Our experienced team of technical consultants is ready to answer any questions regarding SS400 material selection, processing techniques (especially welding and cold bending), application design, and standard comparisons (such as the differences and selection with Q235B and A36).
We provide material substitution feasibility analysis to optimize your costs while ensuring performance.
SS400 Mild Carbon Steel vs. Similar Materials Comparison and Purchasing Recommendations
| Characteristics/Grades | SS400 (JIS) | A36 (ASTM) | Q345B (GB) / SM490 (JIS) |
|---|---|---|---|
| Key Features | Excellent overall performance, easy welding, and economical | American standard general structural steel, highly recognized worldwide | Higher strength for heavier loads or lightweight structures |
| Typical Applications | Light-to-medium-load structures, buildings, and mechanical frames | Light-to-medium-load structures, buildings, and mechanical frames | Medium-to-heavy-load structures, bridges, ships, and pressure vessels |
| Cost Comparison | $$ (Most Economical) | $$$ | $$$$ (Higher) |
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