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Pressure Vessel Plate BS 1501 225 490B LT50

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BS 1501 Grade 225 specifies the requirements for fully killed niobium and aluminium treated carbon manganese steel plates up to 150 mm thick in two grades. The plates may be supplied having specified low temperature impact properties and elevated temperature properties.

The grade BS 1501 225 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).

As well as BS 1501 225 490B LT50, we are also stockists of plates manufactured and certified to:

BS 1501 223 490B LT30 BS 1501 224 490B LT50

Chemical Requirements Chemical composition (ladle analysis, %) of steel 225 Grade 490

C Si Mn P S Nb
0.20 max 0.10 - 0.50 0.90 - 1.60 0.030 max 0.030 max 0.01 - 0.06
Al (metallic) Cr* Cu* Mo* Ni*
0.015 min 0.25 max 0.30 max 0.10 max 0.75 max
Tensile Requirements

Plate Thickness Tensile Rm Yield Re Elong. A
over 3 mm to 16 mm 490 - 610 N/mm2 355 N/mm2 min 21% min
over 16 mm to 40 mm 490 - 610 N/mm2 345 N/mm2 min 21% min
over 40 mm to 63 mm 490 - 610 N/mm2 340 N/mm2 min 20% min
over 63 mm to 100 mm 490 - 610 N/mm2 * 20% min
over 100 mm to 150 mm 490 - 610 N/mm2 * 20% min
Charpy V-notch impact values
Impact test values, average of three at temperature specified below

-20oC -30oC -50oC
61 J min 47 J min 27 J min
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