Hold down bolts for wind towers
[ Time：2019-06-18 Click：824 ]
High duty, High strength wind turbine, wind energy tower foundation anchor bolt cage system in wind energy project. Components including anchor bolt(main part),flange, H.D. bolts, cap, leader bolt, concrete.
ADVANTAGE:
Excellent anti-delay fracture performance and long fatigue life(no damage after 12 million times test);
Provide double thread bolts with maximum length of 12000mm;
Standard: GB/T3098.1 ISO898-1 or costomer’s request
Mechanical Properties
| Grade | Dia | Tensile Strength Rm/MPa |
2% Elongation Limit RP 0.2/MPa |
Stress Under Proof Load SPf/MPa |
Elongation after fracture A/% |
Reduction oF Area after Fracture Z/% | Rockwell Hardness /HRC |
Bolt Length mm |
-40 ℃ Impact Absorb Energy K/J |
|
| min | max | max | ||||||||
| 8.8 | M16 ~M56 |
830 | 660 | 600 | 12 | 52 | 23 | 34 | 12000 | 27 |
| 9.8 | 900 | 720 | 650 | 10 | 48 | 28 | 37 | |||
| 10.9 | 1040 | 940 | 830 | 9 | 48 | 32 | 39 | |||
| 12.9 | 1220 | 1100 | 970 | 8 | 44 | 39 | 44 | |||
Common specifications
| DIA | Grade | Length | |
| Φ35mm(M36) | 8.8 | 10.9 | As Clients' Demands |
| Φ40mm(M42) | 8.8 | 10.9 | |
| Φ45mm(M48) | 8.8 | 10.9 | |
| Φ53mm(M56) | 8.8 | 10.9 | |
Note: Grades, sizes are allowed to change
Manufacture Process
As per different raw materials and demands, process details will be adjusted.
Sample 1.
Raw Material Test --- Normalizing --- Sand blasting --- Drawing & Straightening --- Heat Treatment
--- UT Test --- Saw cutting --- Chamfer --- Polishing --- Screw thread --- Tensile test --- Marking ---
QC Test --- Anti-corrosion Test --- Stock
Sample 2.
Raw Material Test --- Heat Treatment --- Pealing --- Polishing --- UT Test --- Saw Cutting --- Chamfer
--- Polishing --- Screw Thread --- Tensile Test --- Marking --- QC Test --- Anti-corrosion Test --- Stock
Process details information, please find at our BLOG within this website. Thank you!
