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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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