BS1501 – 224-490A/B

BS-224-490A/B is a British Standard specified steel used primarily in the fabrication of weldable steel pressure vessels and boilers.
This particular grade which has now been superseded by the Euro Norm standard EN 10028, has improved tensile strength when compared to BS-224-460. As the specification is no longer current, the information included here should be used for reference purposes only.
There are two types of BS1501-224-490 which are …

  • Type A :
    Denotes specified min. room temperature tensile properties
  • Type B :
    As per Type A but with elevated temperature properties

Table 2: Mechanical Properties of BS1501 – 224-490A/B

Nominal Plate ThicknessTensile StrengthYield StrengthElongation
Over (mm)Up to and inc. (mm)min. N/mm²max. N/mm²min. N/mm²min. (%)

(* Yield strength values for plates over 63mm shall be same values specified for plate thicknesses between 40mm and 63mm reduced by 1% for each 5mm increase over 63mm)
(Please note: the technical information above is for guidance only – for exact specifications please check with our Sales Team)

Table 1: Chemical Composition of BS1501 – 224-490A/B

*C (max)0.22
Si (min)0.10
Si (max)0.40
Mn (min)0.90
Mn (max)1.60
P (max)0.030
S (max)0.030
*Al (metallic) (min)0.015
Cr (max)0.25
Cu (max)0.30
Mo (max)0.10
Ni (max)0.75

(* Aluminium level meets this requirement as long as value is not less than 0.18%)