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M30 Tunnel Segment Bolts for Xiamen Metro Line 4
In 2019, Anyang Railway Equipment Co., Ltd(AT) provided M30 Tunnel Segment Bolts for Xiamen Metro Line 4.
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Xiamen Metro Line 4 is a subway line under construction by Xiamen Metro. The total length of Xiamen Metro Line 4 is 71.23 km.
In 2019, Anyang Railway Equipment Co., Ltd(AT) provided M30 Tunnel Segment Bolts for Xiamen Metro Line 4.
- The segment connection bolts are made of 45#steel, and the surface of the bolts is treated with zinc chrome coating to prevent rust. The zinc chrome coating meets the requirements of “Specifications ofZinc/Chromate Coatings” (GB/T18684-2002), and the protection level is not lower than 9 after the 480h neutral salt spray test. The mechanical properties of the ring tunnel bolts are grade 5.8.
- The mechanical properties of the circumferential bolts and nuts and the longitudinal bolts and nuts are both grade 5.
- The flat washer and nut are made of 45# steel, and the chemical composition and mechanical properties of the material meet the requirements of GB/T 699.
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