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Thrie beam guardrail
The guardrail is mainly to follow the AASHTO M180, GB-T 31439.1-2015 and EN1317 standard.
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W beam guardrail
The material for that are mainly the Q235B (S235Jr the yield strength is more than 235Mpa) and Q345B (S355Jr the yield strength is more than the 345Mpa).
