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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 LT50Chemical 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 valuesImpact 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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