Are you sourcing structural steel plates for construction, machinery, or fabrication projects?
Knowing the right material can save you time and cost.
GNEE Steel is a leading structural steel manufacturer and exporter from China, supplying ASTM, JIS, and GB standard plates with full certification, ready stock, and direct factory pricing.
In this guide, we compare four common structural steels: ASTM A283 Grade C, JIS SS400, JIS SS41, and ASTM A36. You'll learn their key differences in composition, strength, applications, and how to choose the best one for your project.
Overview of Structural Steel Grades
Structural steel is used in buildings, bridges, frames, and general construction. The four grades we compare are:
- ASTM A283 Grade C: A general-purpose carbon steel plate for structural applications.
- JIS SS400: A Japanese standard steel for general structures with minimum tensile strength of 400 MPa.
- JIS SS41: An older JIS standard similar to SS400, still used in some regions.
- ASTM A36: One of the most widely used structural steels in the US for buildings and bridges.
Each grade has unique properties and regional preferences.
Chemical Composition Comparison Table
Chemical composition affects weldability, strength, and durability.
Below is a simplified comparison:
| Grade | C (%) Max | Mn (%) Max | P (%) Max | S (%) Max |
|---|---|---|---|---|
| ASTM A283 Grade C | 0.24 | 0.90 | 0.035 | 0.04 |
| JIS SS400 | 0.23 | 0.60 | 0.050 | 0.050 |
| JIS SS41 | 0.25 | 0.60 | 0.050 | 0.050 |
| ASTM A36 | 0.26 | 0.80–1.20 | 0.040 | 0.050 |
SS400 and SS41 have lower manganese than ASTM grades, affecting toughness.
Mechanical Properties and Applications
Tensile and yield strength determine where each steel is best used:
- ASTM A283 Grade C: Yield ≥ 205 MPa, Tensile 380–515 MPa. Used in storage tanks, frames, and non-critical structures.
- JIS SS400: Yield ≥ 245 MPa, Tensile 400–510 MPa. Common in Asian construction and machinery.
- JIS SS41: Similar to SS400 but with slightly different impact requirements.
- ASTM A36: Yield ≥ 250 MPa, Tensile 400–550 MPa. Widely used in US buildings, bridges, and welding fabrications.
Structural steel grades
How to Choose the Right Structural Steel
Selecting the correct grade depends on:
- Project Specifications: Local codes may require ASTM or JIS standards.
- Welding Needs: A36 and A283 offer good weldability.
- Cost Considerations: SS400 and SS41 are often more economical in Asian markets.
- Availability: GNEE stocks all four grades in thicknesses from 6mm to 200mm.
We provide Mill Test Certificates (MTC) and support third-party inspections (SGS, BV, TUV).
GNEE's Structural Steel Supply Advantages
As a trusted structural steel supplier, GNEE offers:
- Large Inventory: Over 50,000 tons of structural steel plates ready for shipment.
- Processing Services: Cutting, drilling, beveling, and shot blasting.
- Quality Assurance: ISO 9001, API certification, and EN 10204 3.1 reports.
- Global Export: Experienced in shipping to USA, Europe, Middle East, and Southeast Asia.
Advanced machinery cutting structural steel plates to customer dimensions.
Request A Quote Or Technical Support
Need help choosing between A283, SS400, SS41, and A36?
Contact GNEE today for:
Free structural steel comparison guide
Competitive steel plate prices
Custom cutting and coating options
Fast delivery and logistics support
Seaworthy packaged steel plates staged for export shipment.
Conclusion: Source Structural Steel with Confidence
Understanding the differences between ASTM A283 Grade C, SS400, SS41, and ASTM A36 helps you make informed purchasing decisions. Whether you're building infrastructure, machinery, or storage systems, GNEE-as your reliable structural steel manufacturer-provides quality materials, certifications, and expert support.
📩 Ready to order or compare grades? Request a customized quote today.
