Britannia Offshore Platform built with Dillinger S355G8+M TMCP Steel
EN10225 S355G8+M is a weldable structural steel for offshore structures. We hold a large stock of it together with stocks of other TMCP steels for offshore use, including S355G10+M.
Unlike many of the lower EN10225 steels S355G8+M is thermomechanically rolled and quite different to the EN10025 steels due to the addition of Nickel, Chromium and Molybdenum for the corrosion resistant properties.
For customers requiring S355G8+N we also have a large stock available with even thicker plates than S355G8+M
S355G8+M Z35 is available. Some plates are Z35 through tested at the mill according to Option 13 and come with a Z35 designation on the MTC – S355G8+M Z35. Other plates that come without the additional Z35 test can be tested with 3rd party verification quickly and efficiently. With our stock of Dillinger plates the additional through thickness testing is reliable due to the excellent P and S values of the steel
Other offshore grades available include S355G10+M, API 2W-50, S420G2+M, S460G2+M and S460ML
Key Benefits of Buying S35G8+M from Oakley Steel
The key benefits of buying S355G8+M and S355G8+N plates from Oakley Steel are that:
- We have a very high availability of plates on an ex-stock basis. We can deliver most requirements from our out capacity
- S355G+M plates are the best quality from Dillinger Hutte. This means a very clean steel and physical properties that are generally better than that required by EN10225
- Thick plates – lot of the S355G8+N and S355G10+M plates are very thick – up to 150 mm – which save significant delivery time over a mill order – and if you need several we are normally able to supply thick plates for a whole MTO.
S355G8+M Stock
S355G8+M is available ex-stock
- Thickness:10 – 100 mm
- Width: Up to 3.5m
- Length: Up to 12m
S355G8+N Stock
S355G8+M is available ex-stock
- Thickness:10 – 150 mm
- Width: Up to 3.5m
- Length: Up to 12m
Standard
All S355G8+M plates are according to EN10225:2009 or later. (EN10225:2001 is withdrawn)
Designation
- Standard Number: EN10225
- S – from structural
- Minimum Yield at <16 mm: 355 MPa
- G8 – to designate the steel grade
- Thermomechanically Rolled: +M
Typical Mill
- Dillinger Hutte
- Dillingen
- Dunkirk
Tolerances
- Surface: EN10163-B3
- Thickness: EN10029:10-B
- Length & Width: EN10029:10
- Flatness: EN10029:10-T5L
Manufacturing Process
- Vacuum degassed
- Full killed
- Fine Grain Treated
Mill Tests
- Tensile Test
- Hardness Test
- Impact Test: -40C or -50C
- Deep Etch Test
- Drop Weight Test
- Through Thickness: EN10164 Z35
- UT: EN10160 S1
Chemical Composition – Heat Analysis
- Max CEV: 0.43
- Max Pcm: 0.24
Mechanical Properties of Offshore Steel Grades
| Group | Steel Grade | Number | Tensile Strength <40mm | Tensile Strength 40<100mm | Yield Strength | <16mm | 16-25mm | 25-40mm | 40-63mm | 63-100mm | Minimum Elongation | CVN Temperature | CVN Energy | Max Thickness |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | S355G8+M | 1.8810+M | 470 to 630 | 470 to 630 | 355 | 355 | 345 | 335 | 325 | 22% | -40C | 50J | 100mm | |
| 3 | S355G10+M | 1.8813+M | 470 to 630 | 470 to 630 | 355 | 355 | 345 | 335 | 325 | 22% | -40C | 50J | 100mm | |
| 3 | S420G2+M | 1.8857+M | 500 to 660 | 480 to 640 | 420 | 400 | 390 | 380 | 380 | 19% | -40C | 60J | 100mm | |
| 3 | S460G2+M | 1.8887+M | Approx 520 to 700 | Approx 500 to 675 | 460 | 440 | 420 | 415 | 405 (63 to 80) 400 (80 to 100) | 17 | -40C | 60J | 100mm |
MTC Possibilities
- EN10204:2004 3.1
- EN10204:2004 3.2
- EN10204:1991+A1:1995 as per ISO10474:1991
Typical 3rd Party Inspector
- Lloyds Register of Shipping (LRS)
- Det Norske Veritas (DNV)
You can purchase a copy of EN10225 from BSI
