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EN 10045 Charpy Impact Test for Iron and Steel Castings

This standard can be used for the impact test for cast iron and cast steel materials. Herein, we just list some useful information for iron foundries.

The test consists of breaking by one blow from a swinging pendulum, a test piece notched in the middle and supported at each end. The energy absorbed is determined in joules. This absorbed energy is a measure of the impact strength of the material.

The standard test piece shall be 55 mm long and of square section with 10 mm sides. In the centre of the length, there shall be a notch. Two types of notch are specified, include V-and U-notches.

a) V-notch of 45°, 2 mm deep with a 0,25 mm radius of curvature at base of notch. If standard test pieces cannot be obtained from the material, a reduced section test piece, with a width of 7,5 mm or 5 mm (see Table 2) shall be used, the notch being cut in one of the narrow faces.

b) U-notch or keyhole notch, 5 mm deep, with a 1 mm radius of curvature at base of notch. The test pieces shall be machined all over, except in the case of precision cast foundry test pieces in which the two faces parallel to the plane of symmetry of the notch can be un-machined.

The tolerances on the specified dimensions of the test piece shall be as given in the following table.

Tolerances on specified test piece dimensions

Designation U - notch test piece V - notch test piece
Nominal dimension Machining tolerance Nominal dimension Machining tolerance
  ISO symbol   ISO symbol
Length 55 mm ± 0.60mm js 15 55 mm ± 0.60 mm js 15
Height 10 mm ± 0.11mm js 13 10 mm ± 0.60 mm js 12
Width - standard test piece 10 mm ± 0.11mm js 13 10 mm ± 0.11 mm js 13
Width - reduced section test piece  -  -  - 7.5 mm ± 0.11 mm js 13
Width - reduced section test piece  -  -  - 5 mm ± 0.06 mm js 12
Angle of notch  -  -  - 45° ± 2°  -
Height below notch 5 mm ± 0.09mm js 13 8 mm ± 0.06 mm js 12
Radius of curvature of base of notch 1 mm ± 0.07mm js 12 0.25 mm ±0.025 mm  -
Distance of plane of symmetry of notch from ends of test piece 27.5 mm ± 0.42mm js 15 27.5 mm ± 0.42 mm js 15
Angle between plane of symmetry of notch and longitudinal axis of test piece 90° ± 2°  - 90° ± 2°  -
Angle between adjacent longitudinal faces of test piece 90° ± 2°  - 90° ± 2°  -
In accordance with ISO 286 - 1.
For machines with automatic positioning of the test piece, it is recommended that the tolerance be taken as ± 0.165 mm instead of ±0.42 mm.

If the test temperature is not specified in the relevant product standard, it shall be equal to 23 °C ± 5 °C. If the temperature is specified in the relevant product standard without a tolerance, it shall be adhered within ± 2 °C.

Test report

The test report shall include the following information:
a) reference to this standard, i.e. EN 10 045-1;
b) the type and dimensions of the test piece;
c) identification of the test piece (grade, cast no);
d) direction and location of sampling where known;
e) nominal energy of the striker;
f) test temperature, in degrees Celsius;
g) absorbed energy, KV or KU, in joules.

According to experience of Dandong Foundry, most of iron foundries in China can not do this compact test in-house, but they could entrust National Analysis Center for Iron & Steel to do the test for them. NACIS is the third party for inspection, so their report is credible.

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