Strength classification of bolts used in space frame structures shall be of 8.8s/10.9s quality in conformity with GB/T16939-2016 standard, with ISO metric thread sizes. Bolts shall be blacking treatment or coated by DACROMET coating to avoid Hydrogen Embrittlement Fracture and will provide high corrosion resistance in conformity with ISO 10683 standard.
|
specification |
Code |
Chemical composition of raw materials |
Bolt tension test |
|||||||||
|
chemical composition |
C% |
Si% |
Mn% |
Cr% |
P% |
S% |
mechanical property |
tensile strength MPa |
Yield Strength MPa |
HRC |
||
|
M16 |
GB/T16939-2016 |
standard value |
0.37-0.44 |
0.17-0.37 |
0.50-0.80 |
0.80-1.10 |
≤0.030 |
≤0.030 |
standard value |
1040~1240 |
940 |
32~37 |
