Metallin kovuus ja testi
Materiaalin kovuus viittaa materiaalin kykyyn vastustaa muodonmuutoksia, erityisesti plastisia muodonmuutoksia, sisennyksiä tai naarmuja. Se on indikaattori materiaalien pehmeyden ja kovuuden mittaamiseksi.
Liitteenä on erilaisen mittauksen vertailutaulukko.
Hv=hb=HRC -kovuus vertailu
|
Vetolujuus (N/mm²) |
HV |
HB |
HRC |
|
255 |
80 |
76.0 |
- |
|
270 |
85 |
80.7 |
- |
|
285 |
90 |
85.2 |
- |
|
305 |
95 |
90.2 |
- |
|
320 |
100 |
95.0 |
- |
|
335 |
105 |
99.8 |
- |
|
350 |
110 |
105 |
- |
|
370 |
115 |
109 |
- |
|
380 |
120 |
114 |
- |
|
400 |
125 |
119 |
- |
|
415 |
130 |
124 |
- |
|
430 |
135 |
128 |
- |
|
450 |
140 |
133 |
- |
|
465 |
145 |
138 |
- |
|
480 |
150 |
143 |
- |
|
490 |
155 |
147 |
- |
|
510 |
160 |
152 |
- |
|
530 |
165 |
156 |
- |
|
545 |
170 |
162 |
- |
|
560 |
175 |
166 |
- |
|
575 |
180 |
171 |
- |
|
595 |
185 |
176 |
- |
|
610 |
190 |
181 |
- |
|
625 |
195 |
185 |
- |
|
640 |
200 |
190 |
- |
|
660 |
205 |
195 |
- |
|
675 |
210 |
199 |
- |
|
690 |
215 |
204 |
- |
|
705 |
220 |
209 |
- |
|
720 |
225 |
214 |
- |
|
740 |
230 |
219 |
- |
|
755 |
235 |
223 |
- |
|
770 |
240 |
228 |
20.3 |
|
785 |
245 |
233 |
21.3 |
|
800 |
250 |
238 |
22.2 |
|
820 |
255 |
242 |
23.1 |
|
835 |
260 |
247 |
24.0 |
|
850 |
265 |
252 |
24.8 |
|
865 |
270 |
257 |
25.6 |
|
880 |
275 |
261 |
26.4 |
|
900 |
280 |
266 |
27.1 |
|
915 |
285 |
271 |
27.8 |
|
930 |
290 |
276 |
28.5 |
|
950 |
295 |
280 |
29.2 |
|
965 |
300 |
285 |
29.8 |
|
995 |
310 |
295 |
31.0 |
|
1030 |
320 |
304 |
32.2 |
|
1060 |
330 |
314 |
33.3 |
|
1095 |
340 |
323 |
34.4 |
|
1125 |
350 |
333 |
35.5 |
|
1115 |
360 |
342 |
36.6 |
|
1190 |
370 |
352 |
37.7 |
|
1220 |
380 |
361 |
38.8 |
|
1255 |
390 |
371 |
39.8 |
|
1290 |
400 |
380 |
40.8 |
|
1320 |
410 |
390 |
41.8 |
|
1350 |
420 |
399 |
42.7 |
|
1385 |
430 |
409 |
43.6 |
|
1420 |
440 |
418 |
44.5 |
|
1455 |
450 |
428 |
45.3 |
|
1485 |
460 |
437 |
46.1 |
|
1520 |
470 |
447 |
46.9 |
|
1555 |
480 |
(456) |
47.7 |
|
1595 |
490 |
(466) |
48.4 |
|
1630 |
500 |
(475) |
49.1 |
|
1665 |
510 |
(485) |
49.8 |
|
1700 |
520 |
(494) |
50.5 |
|
1740 |
530 |
(504) |
51.1 |
|
1775 |
540 |
(513) |
51.7 |
|
1810 |
550 |
(523) |
52.3 |
|
1845 |
560 |
(532) |
53.0 |
|
1880 |
570 |
(542) |
53.6 |
|
1920 |
580 |
(551) |
54.1 |
|
1955 |
590 |
(561) |
54.7 |
|
1995 |
600 |
(570) |
55.2 |
|
2030 |
610 |
(580) |
55.7 |
|
2070 |
620 |
(589) |
56.3 |
|
2105 |
630 |
(599) |
56.8 |
|
2145 |
640 |
(608) |
57.3 |
|
2180 |
650 |
(618) |
57.8 |
|
660 |
58.3 |
||
|
670 |
58.8 |
||
|
680 |
59.2 |
||
|
690 |
59.7 |
||
|
700 |
60.1 |
||
|
720 |
61.0 |
||
|
740 |
61.8 |
||
|
760 |
62.5 |
||
|
780 |
63.3 |
||
|
800 |
64.0 |
||
|
820 |
64.7 |
||
|
840 |
65.3 |
||
|
860 |
65.9 |
||
|
880 |
66.4 |
||
|
900 |
67.0 |
||
|
920 |
67.5 |
||
|
940 |
68.0 |
