Test in sets of three per temperature; note lateral expansion and percentage shear fracture where required.<\/li>\n<\/ol>\nCalculation & Reporting<\/h2>\n
Report individual and mean absorbed energies (J), test temperature, striker size, notch type and specimen orientation. Sub-size specimens (7.5\/5\/2.5 mm) must be identified \u2014 energies do not scale linearly.<\/p>\n
Acceptance Criteria<\/h2>\n
Typical structural requirements: S355J2 ≥ 27 J at −20 °C; S355K2 ≥ 40 J at −20 °C; pressure equipment and offshore specs set project values. One result may fall below minimum (not below 70% of it) if the set average passes, per most product standards.<\/p>\n
Frequently Asked Questions<\/h2>\nWhy does test temperature matter so much?<\/h3>\n
Ferritic steels lose toughness sharply below their transition temperature. A steel absorbing 150 J at 20 °C can absorb under 20 J at −40 °C \u2014 specifications therefore tie the energy to a design-relevant temperature.<\/p>\n
ISO 148-1 or ASTM E23 \u2014 are results interchangeable?<\/h3>\n
Not strictly: the 2 mm (ISO) and 8 mm (ASTM) strikers give slightly different energies on some steels. Certify to the standard named in the material specification.<\/p>\n
Recommended Apparatus<\/h2>\n
NL Scientific manufactures the Universal Impact Tester (CHARPY & Izod) 5J \/ 5.5J (TOUCH Screen)<\/a> for this method. Browse the full Steel Testing Equipment<\/a> range or request a quotation<\/a> from our engineers.<\/p>\n
\n