We maintain all the mechanical properties like tensile strength, Hardness(Vickers, Brinell, Rockwell, Surface Hardness), Proofing load, Elongation, Surface Integrity
Impact Strength.
| Subclause no. |
Mechanical property |
3.6 |
4.6 |
4.8 |
5.6 |
5.8 |
6.8 |
8.8 |
9.83) |
10.9 |
12.9 |
| d>16mm |
d>16mm2) |
| 5.1 & 5.2 |
Tensile strength, Rm 4), 5) N/mm3 nom min |
300 |
400 |
500 |
600 |
800 |
800 |
900 |
1000 |
1200 |
| 330 |
400 |
420 |
500 |
520 |
600 |
800 |
830 |
900 |
1040 |
1220 |
| 5.3 |
Vickers hardness, HV, F > 98 N min max |
95 |
120 |
130 |
155 |
160 |
190 |
250 |
255 |
290 |
320 |
385 |
250 |
320 |
335 |
360 |
380 |
435 |
| 5.4 |
Brinell hardness, HB, F = 30 D2 min max |
90 |
114 |
124 |
147 |
152 |
181 |
238 |
242 |
276 |
304 |
366 |
| |
238 |
304 |
318 |
342 |
361 |
414 |
| 5.5 |
min HRC Rockwell hardness HR HRC max HRC HRC |
52 |
67 |
71 |
79 |
82 |
89 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
22 |
23 |
28 |
32 |
39 |
99,5 |
- |
- |
- |
- |
- |
- |
32 |
34 |
37 |
39 |
44 |
| 5.6 |
Surface hardness, HV 0,3 max |
- |
6) |
| 5.7 |
Lower yield stress, R eL 7), N/mm2 nom min |
180 |
240 |
320 |
300 |
400 |
480 |
- |
- |
- |
- |
- |
190 |
240 |
340 |
300 |
420 |
480 |
- |
- |
- |
- |
- |
| 5.8 |
Proof strees, R po,2' N/mm2 nom min |
- |
640 |
640 |
720 |
900 |
1080 |
- |
640 |
660 |
720 |
940 |
1100 |
| 5.10 |
Elongation after fracture, A min |
25 |
22 |
14 |
20 |
10 |
8 |
12 |
12 |
10 |
9 |
8 |
| 5.11 |
Strength under wedge loading 5) |
The values for full size bolts and screws (not studs) shall not be smaller than the minimum values for tensile strength shown in 5.2 |
| 5.12 |
Impact strength, J min |
- |
25 |
- |
30 |
30 |
25 |
20 |
15 |
| 5.13 |
Head soundness |
No fracture |
| 5.14 |
Minimum height of non-decarburized thread zone, E |
- |
1/2 H1 |
2/3 H1 |
3/4 H1 |
| Maximum depth of complete decarburization, G mm |
- |
0.015 |
|
