Isi ihe dị mkpa bụ ịgbaso ọkọlọtọ AASHTO M180, GB-T 31439.1-2015 na EN1317.
Ihe e ji mee nke ahụ bụ isi ihe Q235B (S235Jr ike mmepụta karịrị 235Mpa) na Q345B (S355Jr ike mmepụta karịrị 345Mpa).
Maka ọkpụrụkpụ nke ihe nchekwa ahụ, ọkachasị site na 4.0mm ruo 7.0mm ma ọ bụ soro ihe ndị ahịa chọrọ.
A na-etinye ihe mkpuchi elu ahụ ọkụ na-ekpo ọkụ, iji soro AASHTO M232 na ọkọlọtọ nhata dịka AASHTO M111, EN1461 wdg.
A na-etinye ogidi ahụ n'ime ala ahụ, iji sie ike ma kwado ihe mgbochi ahụ. Ọ nwere ike ibelata ike mmetụta ahụ mgbe ihe mberede ahụ na-arị elu.