A Structural Steel Mark Has to Survive Fabrication, Coating, and Field Erection

Fabricated structural steel moves through blasting, priming, sometimes hot-dip galvanizing, and finally field erection before it ever carries a design load, and the heat number and piece mark applied in the fab shop has to survive every one of those steps. A mark that reads clearly on the shop floor but disappears under coating or blast media is a mark that failed at the one job it had. Devore Engraving manufactures custom steel hand stamps built for structural steel identification that holds up through the full fabrication sequence.

What ASTM A6/A6M and AISC Certification Actually Require on Fabricated Steel

ASTM A6/A6M sets the general marking and traceability requirements that apply to rolled structural steel bars, plates, and shapes, requiring that finished products carry the applicable designation, grade, heat number, size, and manufacturer identification. AISC-certified fabricators build on that mill-level marking with their own piece marking systems that carry a member’s identity through fabrication, coating, and shipping to the job site, where an erector matches each piece mark against the shop drawings to place it correctly.

Marking Before Coating vs. Marking After Galvanizing or Paint

Fabricators typically mark heat numbers and piece identification before the steel goes through surface preparation and coating, which means the mark has to survive abrasive blasting, primer application, and in some cases hot-dip galvanizing at temperatures that most general purpose marking methods were never designed to withstand. A stamped impression with adequate depth generally survives this sequence better than a surface-applied mark, but depth still has to be balanced against the base material thickness, particularly on lighter gauge structural members where an overly aggressive stamp can affect the member’s cross section in a way that matters for a structural component.

Piece Marks for Field Erection Sequencing

Beyond material traceability, fabricators apply piece marks, alphanumeric codes tying each physical member back to its position on the shop drawings, so an erection crew can identify and place hundreds of individual members correctly on site. These marks serve a different purpose than the heat number and grade marking required under A6/A6M, and fabricators often specify a separate stamp configuration for piece marking that prioritizes fast, consistent application across a high volume of individual members moving through the shop.

Marking Heavy Sections vs. Thin Gauge Members

A wide flange beam and a light gauge angle or channel present very different marking conditions. Heavy sections can absorb a deeper, more forceful impression without any structural concern, while thin gauge members need a shallower, more controlled mark to avoid affecting the section’s dimensional properties. Fabricators running both heavy and light structural products through the same shop typically need more than one die configuration to mark both correctly.

Devore Engraving Structural Steel Marking Dies

Devore Engraving builds marking tooling for structural steel fabricators who need heat number, grade, and piece marking that survives blasting, coating, and field handling on the way to final erection.

• Custom steel hand stamps for heat number and piece marking on structural members
• Custom metal machine stamps for higher volume marking integrated into fabrication line stations
• Custom machine parts for marking fixtures suited to varied member sizes and shapes
• Custom stamps with interchangeable date coding for production date and batch traceability
• Our construction industry page covers the broader range of construction and structural marking work we support

If piece marks or heat numbers on your structural steel are disappearing under coating or failing to survive the fab shop, the team at Devore Engraving is ready to help. Request a quote and get started.