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490B-LT50

BS 1501 224 490B LT50 (plus 223 & 225 490B)

• BS 1501 was officially withdrawn on 15th February 1993
• Pressure vessel plate manufactured and certified to BS 1501 224 490B LT50 still forms a significant part of Brown McFarlane’s stock inventory, due to an ongoing requirement for the grade.

Grades available from stock :

BS 1501 223 490B LT30
BS 1501 224 490B LT50
BS 1501 225 490B LT50

Background of BS 1501 Grade Pressure Vessel Steel
BS 1501:1980 Part 1, despite being officially withdrawn on 15th February 1993, remains a steel specification that is in regular use and we see daily sales and enquiries for grades that form a part of this standard particularly from our customers in the U.K.
BS 1501 224 specifies requirements for fully killed aluminium treated carbon manganese steel plates up to 150 mm thick in four grades which relate to minimum tensile strength. The plates may also be supplied having specified elevated temperature properties and low temperature impact properties. Plates are supplied in the normalised condition unless an alternative is agreed between supplier and purchaser.

BS 1501 224 490B LT50 (plus 223 & 225 490B)

• BS 1501 was officially withdrawn on 15th February 1993
• Pressure vessel plate manufactured and certified to BS 1501 224 490B LT50 still forms a significant part of Brown McFarlane’s stock inventory, due to an ongoing requirement for the grade.

Grades available from stock :

BS 1501 223 490B LT30
BS 1501 224 490B LT50
BS 1501 225 490B LT50

Background of BS 1501 Grade Pressure Vessel Steel
BS 1501:1980 Part 1, despite being officially withdrawn on 15th February 1993, remains a steel specification that is in regular use and we see daily sales and enquiries for grades that form a part of this standard particularly from our customers in the U.K.
BS 1501 224 specifies requirements for fully killed aluminium treated carbon manganese steel plates up to 150 mm thick in four grades which relate to minimum tensile strength. The plates may also be supplied having specified elevated temperature properties and low temperature impact properties. Plates are supplied in the normalised condition unless an alternative is agreed between supplier and purchaser.

More information

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.

Applications

Boilers
Calorifiers
Dished ends
Flanges

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Properties

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.

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