BS 1501 225 490B LT50

  • 225

BS 1501 225 490B LT50 pressure vessel steel

  • Brown McFarlane holds stocks of pressure vessel plate manufactured and certified to BS 1501 225 490B LT50
  • Cut to size in our dedicated warehousing and processing facility.
  • Fully accredited quality systems to ISO 9001, 14001 and 18001.
  • Delivered worldwide by our international logistics organisation.

BS 1501 225 490B LT50 Pressure Vessel Steel Specification

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

Requirements

Chemical Requirements

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

CSiMnPSNB
0.20 max 0.10 - 0.50 0.90 - 1.60 0.030max 0.030max 0.01 - 0.06
Al (metallic) Cr* Cu* Mo* Ni*  
0.015 min 0.25max 0.30max 0.10max 0.75max
*Cr+Cu+Mo = 0.50% max. The purchaser may specify a Ni content of 0.30% maximum; in this case Cr+Cu+Mo+Ni = 0.70% max.

Tensile Requirements

Plate ThicknessTensile RmYield ReElong. A
over 3 mm to 16 mm 490 - 610N/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
*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.

Impact Values

Impact test values, average of three at temperature specified below

-20oC-30oC-50oC
61J min 47 J min 27 J min
Values apply to plates up to and including 80 mm thick. If the purchaser specifies a maximum Ni of 0.30% the impact values only apply up to and including 63 mm thick.