Step 1:  Our factory use high quality new carbon coil grade of Q235B (S235JR), Q355B (S355JR), ASTM A 36  to produce the guardrail

Step 2: Guardrail formed by mechanical extrusion

Step 3: Hot dip galvanized on the guardrail surface

Step 4：Passivation of passivation solution on the surface of the guardrail beam

Step 5: Goods will be quality checked before send to customer.