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W tan ina guardrail
Ohun elo fun iyẹn jẹ pataki Q235B (S235Jr agbara ikore jẹ diẹ sii ju 235Mpa) ati Q345B (S355Jr agbara ikore jẹ diẹ sii ju 345Mpa).
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Thrie tan ina guardrail
Ẹṣọ ni pataki lati tẹle AASHTO M180, GB-T 31439.1-2015 ati boṣewa EN1317.
