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Division 1.1.1 Steel vessels

United Kingdom

Original text. Later amendments are not shown.

Non-alloy quality steels shall meet the following requirements:

  1. (a)

    they shall be non-effervescent and supplied after normalisation treatment, or in an equivalent state;

  2. (b)

    the content per product of carbon shall be less than 0,25 % and that of sulphur and phosphorus shall each be less than 0,05 %;

  3. (c)

    they shall have the following mechanical properties per product:

    1. (i)

      the maximum tensile strength Rm,max shall be less than 580 N/mm2;

    2. (ii)

      the elongation after fracture shall be:

      if test pieces are taken parallel to the direction of rolling:

      thickness ≥ 3 mm:A≥ 22 %,
      thickness < 3 mm:A80 mm ≥ 17 %,

      if test pieces are taken perpendicular to the direction of rolling:

      thickness ≥ 3 mm:A≥ 20 %,
      thickness < 3 mm:A80 mm ≥ 15 %,
    3. (iii)

      the average bending rupture energy KCV for three longitudinal test pieces at minimum working temperature shall not be less than 35 J/cm2. Not more than one of the three figures may be less than 35 J/cm2, with a minimum of 25 J/cm2. In the case of steels intended to be used in the manufacture of vessels the minimum working temperature of which is lower than – 10 °C and the wall thickness of which exceeds 5 mm, this property shall be checked.