BS 1501 224 490B LT50 Pressure Vessel Steel Specification
The grade BS 1501 224 490B LT50 shows that the steel will have a minimum tensile strength of 490 N/mm2 (490), has elevated temperature properties reported (B), and has low temperature impact properties specified at -50 deg C (LT50).
Although it is not uncommon to see this on steel company web sites, any suggestion that one steel specification and grade is an equivalent to another should be treated with caution. This is because of differences in the methodology and techniques used for testing.
However, BS 1501 224 490B LT50 is broadly similar to the following steel specifications:
ASME SA516 Gr. 70
EN 10028:3 P355NL2
Plates certified to these standards are held in stock by Brown McFarlane.
- Dished ends
Minimum impact values for BS 1501 224 490B LT50
Room temp 0°C -20°C -30°C -40°C -50°C
61J min 55J min 45J min 41J min 31 J min 27 J min
Please see below table detailing tensile requirements for BS 150 224 490B LT50
|Plate thickness||Tensile RM||Yield RE||Elong.A|
|over 3mm to 16mm||490-610N/mm2||325N/mm2 min||21% min|
|over 16mm to 40mm||490-610N/mm2||315N/mm2 min||21% min|
|over 40mm to 63mm||490-610N/mm2||305N/mm2 min||20% min|
|over 63mm to 100mm||490-610N/mm2||*||19% min|
|over 100mm to 150mm||490-610N/mm2||*||19% min|
|*The value of yield strength for plates over 63 mm thick shall be the values specified for plates of thickness between 40 mm and 63 mm reduced by 1% for each 5 mm or part thereof increase in thickness over 63 mm.|