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Boiler Plate Steel BS 1501 161 430A and BS 1501 161 430B

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BS 1501 161

BS 1501 161 specifies requirements for fully killed carbon steel plates up to 150 mm thick in three grades which relate to minimum tensile strength. The plates may also be supplied having specified elevated temperature properties in which case they are designated with a "B" at the end of the specification rather than an "A". Plates are supplied in the normalised condition although at the manufacturer's option the normalising treatment can be ommitted for plates up to and including 40 mm thick provided that all specified property requirements are met when the steel is in the hot finished condition.

BS 1501 161 430A and BS 1501 161 430B: the specification

The grade BS 1501 161 430A shows that the steel will have a minimum tensile strength of 430 N/mm2 (430). BS 1501 161 430B is the same in all respects except that it also has has elevated temperature properties specified (B). As well as BS 1501 161 430A and 430B, we are also stockists of pressure vessel plates manufactured and certified to BS 1501 in the following grades:

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

Chemical Requirements Chemical composition (ladle analysis, %) of steel 161-430






0.25 max

0.10 - 0.35

0.60 - 1.40

0.030 max

0.030 max





0.25 max

0.30 max

0.10 max

0.30 max

Tensile Requirements

Plate Thickness

Tensile Rm

Yield Re

Elong. A

over 3 mm to 16 mm

430 - 550 N/mm2

250 N/mm2 min

23% min

over 16 mm to 40 mm

430 - 550 N/mm2

240 N/mm2 min

23% min

over 40 mm to 63 mm

430 - 550 N/mm2

230 N/mm2 min

22% min

over 63 mm to 100 mm

430 - 550 N/mm2

220 N/mm2 min

21% min

over 100 mm to 150 mm

430 - 550 N/mm2

210 N/mm2 min

21% min


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