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  Mechanical Parameters  
 

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

 

 
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