Paragraph 5 Steel vessels
Non-alloy quality steels must meet the following requirements—
they must be non-effervescent and supplied after normalisation treatment, or in an equivalent state;
the content per product of carbon must be less than 0.25% and that of sulphur and phosphorous must each be less than 0.05%
they must have the following mechanical properties per product—
the maximum tensile strength Rm, max must be less than 580 N/mm2;
the elongation after fracture must be:
if test pieces are taken parallel to the direction of rolling:
| thickness ≥ 3 mm: | A | ≥ 22%, |
| thickness < 3 mm: | A 80 mm | ≥ 17%, |
or, if test pieces are taken perpendicular to the direction of rolling:
| thickness ≥ 3 mm: | A | ≥ 20%, |
| thickness < 3 mm: | A80 mm | ≥15%, |
the average bending rupture energy (KCV) for three longitudinal test pieces at minimum working temperature must 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 25J/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 must be checked.
Notes on the whole SI
Textual amendments
- F1
- F2
1972 c.68. Section 2(2) was amended by section 27(1)(a) of the Legislative and Regulatory Reform Act 2006 (c.51) and by Part 1 of the Schedule to the European Union (Amendment) Act 2008 (c.7). The enabling powers of section 2(2) were extended by virtue of the amendment of section 1(2) by section 1 of the European Economic Area Act 1993 (c.51).
- F3
Paragraph 1A of Schedule 2 was inserted by section 28 of the Legislative and Regulatory Reform Act 2006 and amended by Part 1 of the Schedule to the European Union (Amendment) Act 2008.