SS400 Carbon Steel Plate
JIS G3101 structural plate and sheet
SS400 is the Japanese structural grade: 245 MPa minimum yield at 16 mm and below, tensile 400–510 MPa. It is the grade most common in Southeast Asia and in plants built with Japanese machinery, and it is treated as equivalent to S235JR, A36 and Q235B. JIS G3101 controls phosphorus and sulphur but does not fix carbon and manganese, so we always confirm the mill’s actual composition on the certificate before shipping.
Equivalent grades
| JIS G3101 | SS400 |
|---|---|
| EN 10025-2 | S235JR |
| ASTM | A36 |
| GB/T 700 | Q235B |
| DIN 17100 | St37-2 |
JIS G3101
Chemical composition
| C | Mn | P | S |
|---|---|---|---|
| ≤ 0.20 | ≤ 1.40 | ≤ 0.050 | ≤ 0.050 |
Values in % by mass. Limits are maxima unless a range is stated.
Mechanical properties
| Thickness t (mm) | ReH min (MPa) | Rm (MPa) | A min (%) |
|---|---|---|---|
| ≤ 16 | 245 | 400 – 510 | 21 |
| 16 – 40 | 235 | 400 – 510 | 21 |
| 40 – 100 | 215 | 400 – 510 | 17 |
Typical values per JIS G3101. The composition and mechanical properties of your order are stated on the EN 10204 3.1 mill test certificate.
Dimensions
| Thickness / diameter (mm) | 1.5 – 150 |
|---|---|
| Width / size class | 1000 – 3200 |
| Length / face | up to 12000 mm or cut to size |
Plate, sheet or coil · Sizes outside the ranges below are available on request — send the specification and quantity.
Typical applications
- Plant structures and equipment frames
- Japanese-design machinery bases
- Fabricated beams and columns
- Shipbuilding and port equipment
- General plate work
How to choose
Order & delivery
| Lead time | 15 – 30 days after deposit or L/C for mill-rolled material; stock sizes ship sooner. |
|---|---|
| Packing | Steel strapping, wooden pallets or crates, edge protection, custom shipping marks. |
| Payment | T/T with deposit, or L/C at sight. Terms are confirmed on the proforma invoice. |
| Minimum order | Normally one 20′ container per size; mixed sizes can be combined in one container. |
| Documents | Invoice, packing list, bill of lading, certificate of origin, EN 10204 3.1 mill test certificate. |
| Incoterms | FOB, CFR, CIF to your port. Third-party inspection (SGS, BV, Intertek) arranged on request. |
FAQ
Why does the SS400 certificate not always list carbon?
Can SS400 and S235JR be used interchangeably?
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