53,200 sets of M30*545 Tunnel segment bolts supplier for Wuhan Metro Line 12
In 2025, Anyang Railway Equipment Co., Ltd. supplied 53,200 sets of M30*545 tunnel segment bolts to Wuhan Metro Line 12.
The total length of Wuhan Metro Line 12 is about 59.9 km (entirely underground), with 37 stations and an average station spacing of approximately 1.62 km.
In 2025, Anyang Railway Equipment Co., Ltd. supplied 53,200 sets of M30*545 tunnel segment bolts to Wuhan Metro Line 12.
The mechanical property of M30 tunnel segment bolts are grade of 8.8, the nuts’grade are 8.0, and the washers have a mechanical property HV≥200.
All bolts, nuts, and washers are coated with a zinc-based chromate anti-corrosion coating with a thickness ≥8 micrometers.
Testing standards: GB/T3098.1-2010 “Mechanical Properties of Fasteners
– Bolts, Screws and Studs”; GB/T3098.2-2015 “Mechanical Properties of Fasteners- Nuts”;
GB/T10125-2021 “Artificial Atmosphere Corrosion Test – Salt Spray Test”.
| S/N | Technical Requirement | Standard | |
| 1 |
Bolt tension |
The stress Rpo.2, MPa,
is specified as a non-proportional extension of 0.2%. |
≥660 |
| 2 | Tensile strength, MPa | ≥830 | |
| 3 | Elongation after fracture, % | ≥12 | |
| 4 | Nut | Nuts proof load | ≥516.1kN, nut is not broken |
| 5 | Washer | thickness，HV | HV≥200 |
| 6 | Coating thickness | Coating thickness (for bolts, nuts, and washers): ≥8 μm | ≥8 |
| 7 | Salt spray test | No red rust was found on the bolts, nuts, and washers. | ≥168h |
