Plant inquiries often mention grades such as Q235 or Q355. Special members may use others, for example Q345QD in the official overpass news. Quality and impact values still need a design note.

Do not swap a grade into another national standard without the code name. Welding and NDT also belong in the design file.

Materials follow the contract schedule. No grade is written as the only plant choice, and unpublished thickness is omitted.

Name the design file or local code in the inquiry. A spoken grade alone keeps the reply at scheme level.

Tiankai Southeast fabricates marked members from approved drawings and supports erection by mark number. Sizes, loads and delivery follow the confirmed design file and contract; this page does not turn uncalculated tonnage, thickness or time into a promise.