1. Basic Material Standard
Q235：Chinese national standard (GB/T 700), the most common carbon steel for domestic & general export Steel Grating.
A36：American standard (ASTM A36), mandatory material for USA & Canada projects, matching ANSI/NAAMM MBG 531-24 steel grating.
2. Mechanical Performance (Core Difference for Grating)
| Item | Q235 | A36 | Practical Impact |
|---|---|---|---|
| Yield Strength | ≥235 MPa | ≥250 MPa | A36 is 15 MPa higher, better load-bearing safety |
| Tensile Strength | 375–500 MPa | 400–550 MPa | A36 has stronger overall structural stability |
| Elongation | ≥26% | ≥20% | Q235 better ductility, easier bending & processing |
| Low-temperature Toughness | Normal room temp use | Better low-temperature resistance | A36 suitable for cold North American regions |
3. Chemical Composition & Corrosion Resistance
Manganese Content
A36 has higher Mn, better welding performance for heavy-duty steel grating.
Copper Element
A36 contains Cu ≥ 0.20%, natural atmospheric corrosion resistance better than Q235.
Q235 relies entirely on hot-dip galvanizing for anti-rust.
For outdoor, chemical plant, coastal projects: A36 performs longer service life.
4. Procurement Cost & Supply Stability
Q235
Mass spot stock in China, easy purchasing, short lead time.
Cost 10%–15% lower than A36, high cost-performance.
A36
Need customized rolling & special raw material ordering.
Higher material cost and longer production cycle.
Must be used if clients require ASTM & North American project approval.
5. Welding & Galvanizing Performance
Welding: Both are excellent low-carbon steel, no welding difficulty for steel grating pressing & welding.
Hot-dip Galvanizing: Both adapt to GB/T 13912 & ASTM A123 galvanizing standards;Zinc coating thickness and anti-rust effect are consistent after processing.
Media Contact
Company Name: Ningbo Jiulong Machinery Manufacturing Co.,Ltd.
Email: Send Email
Country: China
Website: https://www.jlgratings.com/
