High-strength Low-alloy Heat-treatable Steels with Good Enamel ...

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Fig. 6:Compilation of the different results for each parameter constellation with EH800 steel andboiler enamelDespite the mentioned experimental criticism, thoroughness of detachment has astrikingly clear tendency. It is clearly effected by steel-enamel combination and not bythe used parameters. Also, the more the enamel detaches thoroughly, the less of ascattering of the individual values is observed (Tab. 1). The tendency that the tensilesamples with higher detachment thoroughness also have higher maximum stressvalues within the same parameter configuration, seldom if never applies. Samples withthe same rating also do not have similar values. Issuing factors for the maximum stressvalues considering their validity is therefore futile.10 von 14
Parameters Sample Max. Stress Mean Max. Stress Rating Mean RatingLH800 1 1 1,00 4820° C, 4 min. 1 1 b 0,53 4,51,38Testenamel 1 2 3,36 23,881 2 b 0,63 5LH800 1 3 1,41 4820° C, 7 min. 1 3 b 2,07 51,82Testenamel 1 4 2,45 2,53,501 4 b 1,34 2,5LH800 1 5 1,07 2,5870° C, 4 min. 1 5 b 1,65 41,50Testenamel 1 6 1,01 43,131 6 b 2,29 2LH800 1 7 2,68 1,5870° C, 7 min. 1 7 b 1,88 51,98Testenamel 1 8 1,14 43,881 8 b 2,22 5LH800 1 9 0,48 2,5820° C, 4 min. 1 9 b 0,55 1,51,25Boilerenamel 1 10 1,68 2,52,751 10 b 2,28 4,5LH800 1 11 2,24 2,5820° C, 7 min. 1 11 b 1,27 2,51,39Boilerenamel 1 12 0,94 33,131 12 b 1,09 4,5LH800 1 13 1,35 3870° C, 4 min. 1 13 b 1,60 51,73Boilerenamel 1 14 2,03 2,53,501 14 b 1,95 3,5LH800 1 15 1,33 3870° C, 7 min. 1 15 b 2,99 3,52,61Boilerenamel 1 16 3,35 1,52,881 16 b 2,79 3,5Parameters Sample Max. Stress Mean Max. Stress Rating Mean RatingDC04EK 2 1 2,16 2,5820° C, 4 min. 2 1 b 0,34 2,51,09Testenamel 2 2 1,02 1,52,252 2 b 0,86 2,5DC04EK 2 3 1,27 1,5820° C, 7 min. 2 3 b 2,12 31,30Testenamel 2 4 0,62 32,752 4 b 1,18 3,5DC04EK 2 5 1,61 2870° C, 4 min. 2 5 b 1,55 2,51,44Testenamel 2 6 0,68 22,632 6 b 1,90 4DC04EK 2 7 1,28 1870° C, 7 min. 2 7 b 2,03 2,51,36Testenamel 2 8 0,86 22,132 8 b 1,27 3DC04EK 2 9 1,06 1,5820° C, 4 min. 2 9 b 0,64 1,50,84Boilerenamel 2 10 0,09 1,51,382 10 b 1,57 1DC04EK 2 11 0,63 1,5820° C, 7 min. 2 11 b 0,65 1,50,89Boilerenamel 2 12 0,48 1,51,382 12 b 1,81 1DC04EK 2 13 0,77 1870° C, 4 min. 2 13 b 0,41 1,50,53Boilerenamel 2 14 0,75 11,252 14 b 0,19 1,5DC04EK 2 15 0,91 1870° C, 7 min. 2 15 b 1,26 1,50,88Boilerenamel 2 16 0,52 1,51,382 16 b 0,82 1,5Tab. 1: Measured values of maximum stress for tearing off the enamel and rating for thoroughness ofenamel detachment from steel (1 = very good, 5 = very bad)Despite these variations, the mean values of the maximum withdrawal stresses weredetermined for each parameter constellation (Fig. 7).Fig. 7:Overview of mean maximum stress for adhesion tests for all steel and enamel types andparameter configurationsA comparison of these averages for the various parameter combinations with theadhesion ranking values previously determined in the drop tests, provides a moremeaningful picture (see Fig. 8). It clearly demonstrates that samples with thoroughenamel separation (higher rating = poor enamel adhesion) have higher mean values ofthe maximum withdrawal tension. The only real point of discontinuity in this graph is11 von 14
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High-strength Low-alloy Heat-treatable Steels with Good Enamel ...

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