| Point | AR plate strip | Purpose-made edge |
|---|---|---|
| Design intent | General wear plate | Designed for a plow’s contact and fit |
| Fit and holes | You cut and drill it | Supplied with holes and profile |
| Hardness and wear | Harder than mild steel; check the mill sheet | Varies by design and material |
| Toughness on impact | Depends on grade and thickness; hard plate can crack at holes | Designed for the duty, depending on the product |
| Drilling and cutting | Harder to machine; heat can soften or stress the plate | Done at the factory |
| Welding | Possible with proper procedures; risky without them | Usually bolted, not welded |
| Traceability | Ask the mill for certificates | Ask the supplier |
Questions to settle first
Cutting your own edge from AR400 is a make-or-buy decision, and the risks sit in the details rather than the hardness. Settle these five before anyone lights a torch.
- What does the plow maker say about replacement edges? Some approvals are voided by a non-standard edge, which matters while the plow is under warranty.
- Who will cut and drill the plate, and with what method? Abrasive waterjet and plasma leave different heat-affected zones around the holes.
- Where are the holes relative to the plate edge? Holes too close to an edge invite cracks under load.
- Which mill data sheet applies to the plate? AR400 is a family of specifications, not a single grade.
- Is the strip thick enough and long enough for your plow? A thinner strip wears through faster than the saving justifies.
When it might make sense
- A light-duty plow on smooth surfaces, as a trial.
- A temporary repair where nothing else is available.
When it probably does not
- High-mileage routes with hidden hazards.
- Warranty or contract conditions that require specified parts.
Try one strip on one truck and log it against a standard edge.
What to log in a trial
Record the plate grade and thickness, the mill certificate number, how holes were made, the date fitted, the surface type and the hours of use, with any cracks or chips. Compare against a standard edge on a similar truck and route. A trial like this gives you a clear answer for your conditions, and it protects you from relying on a story you heard from someone else.
Boundary: general comparison with no numeric properties. Check the mill’s data sheet and the plow maker’s guidance; not engineering advice.
Further reading on this site.
Steel Grades for Plow Edges: Hardness, Toughness and Weldability Trade-Offs ↗What Packed Ice Does to a Standard Cutting Edge ↗Carbide snow plow blades ↗Brinell vs Rockwell on Steel Edges: How to Read a Hardness Spec Line ↗Rubber at Low Temperature: What ASTM D2137 Covers and What to Ask a Maker ↗When Welding Repair on a Hardened Edge Is Unwise: Cracking Risks in Plain Language ↗
