Low alloy structural steel S355G8+M,S355G8+M steel plate,S355G8+M steel sheet is Under European steel standard En 10225,S355G8 has two different types,aush as S355G8+M and S355G8+N,the main difference is the heat treatment when rolling.Oil and offshore platform steel plate S355G8+M shall be done TMCP when rolling,and S355G8+N shall be done Normalized heat treatment.These two oil and offshore steel grade shall be done low temperature under mins 40 centigrade and the minimum energy value shall be above 50J.
Steel Standard:EN 10225
Rolling Type:Oil and offshore platform steel plate
Thickness:6mm-300mm
Width:1500mm-4200mm
Length:3000mm-18000mm
Heat Treatment:Thermo-Mechanical Control Process (TMCP)
Technical Requirements & Additional Services for S355G8+M steel plate:
Z TEST (Z15,Z25,Z35)
Low temperature impacting test
Ultrasonic test under EN 10160,ASTM A435,A577,A578
Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
Shot blasting and Painting,Cutting and welding as per end user's demands
Mechnical property for S355G8+M steel plate:
| Thickness (mm) | |||||||
| S355G8+M | ≤ 16 | > 16 ≤ 25 | > 25 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 100 | > 100 | |
| Yield strength (≥Mpa) | 355 | 355 | 345 | 335 | 325 | 325 | |
| ≤ 100 | > 100 | ||||||
| Tensile strength (Mpa) | 470-630 | 470-630 | |||||
Chemical composition for S355G8+M steel plate (Ladle Analysis Max%)
| Main chemical elements composition of S355G8+M steel plate | ||||||||
| C | Si | Mn | P | S | Cr | Mo | Nb+V | Nb+V+Ti |
| 0.14 | 0.15-0.55 | 1.00-1.65 | 0.020 | 0.007 | 0.25 | 0.08 | 0.06 | 0.08 |
| Ni | Alt | Cu | N | Nb | Ti | V | Cr+Mo+Ni+Cu | |
| 0.50 | 0.015-0.055 | 0.30 | 0.010 | 0.040 | 0.025 | 0.060 | 0.90 | |
