FOUNDATION BOLTS
FOUNDATION BOLTS
[ AREAS-708 ]Foundation Bolts for Wind Mills
Foundation bolts for wind mills are used in pre-engineered wind turbine foundations and construction.These Foundation Bolts are available in different variety & of types including Full threaded & partial threaded.
Popular grades include MS, 8.8, 10.9, 12.9, SS316, SS304, SS316L, B7, B8, L7, L7M, etc. The Dimensionas per customer requirements.
Mechanical properties of fasteners madeof carbon steel and alloy steel 10.9
The ISO 898-1:2013 Grade 10.9 specification covers carbon steel bolts and studs ranging from M-6 to M-64 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties of grade 10.9. There are three popular grades in this standard, 8.8, 10.9 and 12.9 which denote material hardness strength and their respective mechanical properties.
ISO 898-1:2013 Grade 10.9
| 10.9 |  | Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
ISO 898-1:2013 grade 10.9 Chemical properties
Property class | Material and heat treatment | Chemical composition limit (cast analysis, %)a | Tempering temperature ⁰C Min. | ||||
C | P | S | Bb | ||||
min. | max. | max. | max. | max. | |||
10.9 | Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered | 0,20e | 0,55 | 0,025 | 0,025 | 0,003 | 425 |
Carbon steel quenched and tempered | 0,25 | 0,55 | 0,025 | 0,025 | |||
Alloy steel quenched and temperedg | 0,20 | 0,55 | 0,025 | 0,025 | |||
ISO 898-1:2013 grade 10.9 Mechanical properties
Mechanical or physical property | Tensile strength, Rm, MPa | Stress at 0,2 % non-proportional elongation, Rp0,2, MPa | Stress under proof load, Spf, MPa | Proof strength ratio Sp,nom/ReL,min | Percentage elongation after fracture for machined test pieces, A, % | Percentage reduction of area after fracture for machined test pieces, Z, % | Height of non-decarburized thread zone, E, mm | Depth of complete decarburization in the thread, G, mm | Reduction of hardness after retempering, HV | Impact strength, KVij, J | ||
nom.c | min. | nom.c | min. | nom. | min | min. | min. | min. | max. | max. | min. | |
10.9 | 1000 | 1040 | 900 | 940 | 830 | 0,88 | 9 | 48 | 2/3 H1 | 0,017 | 22 | 27 |
ISO 898-1:2013 grade 10.9 Recommended hardness
Mechanical or physical property | Vickers hardness, HV F ≥98 N | Brinell hardness, HBW F = 30 D2 | Rockwell hardness, HRC | Surface hardness, HV 0,3 | |||
min. | max. | min. | max. | min. | max. | max. | |
10.9 | 320 | 380 | 316 | 375 | 32 | 39 | 390 |
