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BS1501 161 430A and BS1501 161 430B Boiler Plate Steel

  • BS1501 is the British standard for carbon and carbon manganese steel plates used in pressure applications.

    A significant part of Brown McFarlane’s boiler plate stock inventory is made up of plates certified to BS1501 161 430A and BS1501 161 430B. This is despite the fact that BS 1501: 1980 Part 1 was officially withdrawn on 15th February 1993. The standard was superseded by the European standard EN 10028.
    Brown McFarlane recognise that BS1501 is a steel specification that is still required by our customers and for that reason, we continue to hold stock in order to provide the best possible service.

  • BS1501 161 Boiler Plate Steel Specification

    BS 1501 161 specifies requirements for fully killed carbon steel plates up to 150mm thick in three grades.
    The two types of BS1501 161 430 available are type A and type B:
    • Type A: indicated specified minimum room temperature tensile strength
    • Type B: as above but with specified elevated temperature properties
    Steel plates are supplied in the normalised condition, however the normalising treatment can be omitted for plates up to and including 40mm thick. In these cases, all specified property requirements must be met when the steel is in the hot finished condition.

  • Other BS1501 Steel Plate Grades

    BS 1501 161 430 type B is the same as type A in all respects except that it also has elevated temperature properties specified.
    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


  • Boilers
  • Calorfiers
  • Dished ends
  • Flanges


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

C Si Mn P S Cr Cu Mo Ni
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 3mm to 16mm 430 – 550N/mm2 250N/mm2 min. 23% min
over 16mm to 40mm 430 – 550N/mm2 240N/mm2 min. 23% min
over 40mm to 63mm 430 – 550N/mm2 230N/mm2 min. 22% min
over 63mm to 100mm 430 – 550N/mm2 220N/mm2 min. 21% min
over 100mm to 150mm 430 – 550N/mm2 210N/mm2 min. 21% min

Min. values for proof strength Rp0,2 (MPa) at elevated temperatures.

Thickness 150°C 200°C 250°C 300°C 350°C 400°C
3mm to 16mm 222 215 192 161 153 148
over 16mm to 40mm 210 202 181 161 153 148
over 40mm to 63mm 200 192 178 161 153 148
over 63mm to 100mm 186 181 172 161 153 148

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